Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/lib/vsprintf.c

  1 /*
  2  *  linux/lib/vsprintf.c
  3  *
  4  *  Copyright (C) 1991, 1992  Linus Torvalds
  5  */
  6 
  7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
  8 /*
  9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
 10  */
 11 
 12 /*
 13  * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
 14  * - changed to provide snprintf and vsnprintf functions
 15  * So Feb  1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
 16  * - scnprintf and vscnprintf
 17  */
 18 
 19 #include <stdarg.h>
 20 #include <linux/clk.h>
 21 #include <linux/clk-provider.h>
 22 #include <linux/module.h>       /* for KSYM_SYMBOL_LEN */
 23 #include <linux/types.h>
 24 #include <linux/string.h>
 25 #include <linux/ctype.h>
 26 #include <linux/kernel.h>
 27 #include <linux/kallsyms.h>
 28 #include <linux/math64.h>
 29 #include <linux/uaccess.h>
 30 #include <linux/ioport.h>
 31 #include <linux/dcache.h>
 32 #include <linux/cred.h>
 33 #include <net/addrconf.h>
 34 #ifdef CONFIG_BLOCK
 35 #include <linux/blkdev.h>
 36 #endif
 37 
 38 #include "../mm/internal.h"     /* For the trace_print_flags arrays */
 39 
 40 #include <asm/page.h>           /* for PAGE_SIZE */
 41 #include <asm/sections.h>       /* for dereference_function_descriptor() */
 42 #include <asm/byteorder.h>      /* cpu_to_le16 */
 43 
 44 #include <linux/string_helpers.h>
 45 #include "kstrtox.h"
 46 
 47 /**
 48  * simple_strtoull - convert a string to an unsigned long long
 49  * @cp: The start of the string
 50  * @endp: A pointer to the end of the parsed string will be placed here
 51  * @base: The number base to use
 52  *
 53  * This function is obsolete. Please use kstrtoull instead.
 54  */
 55 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
 56 {
 57         unsigned long long result;
 58         unsigned int rv;
 59 
 60         cp = _parse_integer_fixup_radix(cp, &base);
 61         rv = _parse_integer(cp, base, &result);
 62         /* FIXME */
 63         cp += (rv & ~KSTRTOX_OVERFLOW);
 64 
 65         if (endp)
 66                 *endp = (char *)cp;
 67 
 68         return result;
 69 }
 70 EXPORT_SYMBOL(simple_strtoull);
 71 
 72 /**
 73  * simple_strtoul - convert a string to an unsigned long
 74  * @cp: The start of the string
 75  * @endp: A pointer to the end of the parsed string will be placed here
 76  * @base: The number base to use
 77  *
 78  * This function is obsolete. Please use kstrtoul instead.
 79  */
 80 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
 81 {
 82         return simple_strtoull(cp, endp, base);
 83 }
 84 EXPORT_SYMBOL(simple_strtoul);
 85 
 86 /**
 87  * simple_strtol - convert a string to a signed long
 88  * @cp: The start of the string
 89  * @endp: A pointer to the end of the parsed string will be placed here
 90  * @base: The number base to use
 91  *
 92  * This function is obsolete. Please use kstrtol instead.
 93  */
 94 long simple_strtol(const char *cp, char **endp, unsigned int base)
 95 {
 96         if (*cp == '-')
 97                 return -simple_strtoul(cp + 1, endp, base);
 98 
 99         return simple_strtoul(cp, endp, base);
100 }
101 EXPORT_SYMBOL(simple_strtol);
102 
103 /**
104  * simple_strtoll - convert a string to a signed long long
105  * @cp: The start of the string
106  * @endp: A pointer to the end of the parsed string will be placed here
107  * @base: The number base to use
108  *
109  * This function is obsolete. Please use kstrtoll instead.
110  */
111 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
112 {
113         if (*cp == '-')
114                 return -simple_strtoull(cp + 1, endp, base);
115 
116         return simple_strtoull(cp, endp, base);
117 }
118 EXPORT_SYMBOL(simple_strtoll);
119 
120 static noinline_for_stack
121 int skip_atoi(const char **s)
122 {
123         int i = 0;
124 
125         do {
126                 i = i*10 + *((*s)++) - '';
127         } while (isdigit(**s));
128 
129         return i;
130 }
131 
132 /*
133  * Decimal conversion is by far the most typical, and is used for
134  * /proc and /sys data. This directly impacts e.g. top performance
135  * with many processes running. We optimize it for speed by emitting
136  * two characters at a time, using a 200 byte lookup table. This
137  * roughly halves the number of multiplications compared to computing
138  * the digits one at a time. Implementation strongly inspired by the
139  * previous version, which in turn used ideas described at
140  * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
141  * from the author, Douglas W. Jones).
142  *
143  * It turns out there is precisely one 26 bit fixed-point
144  * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
145  * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
146  * range happens to be somewhat larger (x <= 1073741898), but that's
147  * irrelevant for our purpose.
148  *
149  * For dividing a number in the range [10^4, 10^6-1] by 100, we still
150  * need a 32x32->64 bit multiply, so we simply use the same constant.
151  *
152  * For dividing a number in the range [100, 10^4-1] by 100, there are
153  * several options. The simplest is (x * 0x147b) >> 19, which is valid
154  * for all x <= 43698.
155  */
156 
157 static const u16 decpair[100] = {
158 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
159         _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
160         _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
161         _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
162         _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
163         _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
164         _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
165         _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
166         _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
167         _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
168         _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
169 #undef _
170 };
171 
172 /*
173  * This will print a single '' even if r == 0, since we would
174  * immediately jump to out_r where two 0s would be written but only
175  * one of them accounted for in buf. This is needed by ip4_string
176  * below. All other callers pass a non-zero value of r.
177 */
178 static noinline_for_stack
179 char *put_dec_trunc8(char *buf, unsigned r)
180 {
181         unsigned q;
182 
183         /* 1 <= r < 10^8 */
184         if (r < 100)
185                 goto out_r;
186 
187         /* 100 <= r < 10^8 */
188         q = (r * (u64)0x28f5c29) >> 32;
189         *((u16 *)buf) = decpair[r - 100*q];
190         buf += 2;
191 
192         /* 1 <= q < 10^6 */
193         if (q < 100)
194                 goto out_q;
195 
196         /*  100 <= q < 10^6 */
197         r = (q * (u64)0x28f5c29) >> 32;
198         *((u16 *)buf) = decpair[q - 100*r];
199         buf += 2;
200 
201         /* 1 <= r < 10^4 */
202         if (r < 100)
203                 goto out_r;
204 
205         /* 100 <= r < 10^4 */
206         q = (r * 0x147b) >> 19;
207         *((u16 *)buf) = decpair[r - 100*q];
208         buf += 2;
209 out_q:
210         /* 1 <= q < 100 */
211         r = q;
212 out_r:
213         /* 1 <= r < 100 */
214         *((u16 *)buf) = decpair[r];
215         buf += r < 10 ? 1 : 2;
216         return buf;
217 }
218 
219 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
220 static noinline_for_stack
221 char *put_dec_full8(char *buf, unsigned r)
222 {
223         unsigned q;
224 
225         /* 0 <= r < 10^8 */
226         q = (r * (u64)0x28f5c29) >> 32;
227         *((u16 *)buf) = decpair[r - 100*q];
228         buf += 2;
229 
230         /* 0 <= q < 10^6 */
231         r = (q * (u64)0x28f5c29) >> 32;
232         *((u16 *)buf) = decpair[q - 100*r];
233         buf += 2;
234 
235         /* 0 <= r < 10^4 */
236         q = (r * 0x147b) >> 19;
237         *((u16 *)buf) = decpair[r - 100*q];
238         buf += 2;
239 
240         /* 0 <= q < 100 */
241         *((u16 *)buf) = decpair[q];
242         buf += 2;
243         return buf;
244 }
245 
246 static noinline_for_stack
247 char *put_dec(char *buf, unsigned long long n)
248 {
249         if (n >= 100*1000*1000)
250                 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
251         /* 1 <= n <= 1.6e11 */
252         if (n >= 100*1000*1000)
253                 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
254         /* 1 <= n < 1e8 */
255         return put_dec_trunc8(buf, n);
256 }
257 
258 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
259 
260 static void
261 put_dec_full4(char *buf, unsigned r)
262 {
263         unsigned q;
264 
265         /* 0 <= r < 10^4 */
266         q = (r * 0x147b) >> 19;
267         *((u16 *)buf) = decpair[r - 100*q];
268         buf += 2;
269         /* 0 <= q < 100 */
270         *((u16 *)buf) = decpair[q];
271 }
272 
273 /*
274  * Call put_dec_full4 on x % 10000, return x / 10000.
275  * The approximation x/10000 == (x * 0x346DC5D7) >> 43
276  * holds for all x < 1,128,869,999.  The largest value this
277  * helper will ever be asked to convert is 1,125,520,955.
278  * (second call in the put_dec code, assuming n is all-ones).
279  */
280 static noinline_for_stack
281 unsigned put_dec_helper4(char *buf, unsigned x)
282 {
283         uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
284 
285         put_dec_full4(buf, x - q * 10000);
286         return q;
287 }
288 
289 /* Based on code by Douglas W. Jones found at
290  * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
291  * (with permission from the author).
292  * Performs no 64-bit division and hence should be fast on 32-bit machines.
293  */
294 static
295 char *put_dec(char *buf, unsigned long long n)
296 {
297         uint32_t d3, d2, d1, q, h;
298 
299         if (n < 100*1000*1000)
300                 return put_dec_trunc8(buf, n);
301 
302         d1  = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
303         h   = (n >> 32);
304         d2  = (h      ) & 0xffff;
305         d3  = (h >> 16); /* implicit "& 0xffff" */
306 
307         /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
308              = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
309         q   = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
310         q = put_dec_helper4(buf, q);
311 
312         q += 7671 * d3 + 9496 * d2 + 6 * d1;
313         q = put_dec_helper4(buf+4, q);
314 
315         q += 4749 * d3 + 42 * d2;
316         q = put_dec_helper4(buf+8, q);
317 
318         q += 281 * d3;
319         buf += 12;
320         if (q)
321                 buf = put_dec_trunc8(buf, q);
322         else while (buf[-1] == '')
323                 --buf;
324 
325         return buf;
326 }
327 
328 #endif
329 
330 /*
331  * Convert passed number to decimal string.
332  * Returns the length of string.  On buffer overflow, returns 0.
333  *
334  * If speed is not important, use snprintf(). It's easy to read the code.
335  */
336 int num_to_str(char *buf, int size, unsigned long long num)
337 {
338         /* put_dec requires 2-byte alignment of the buffer. */
339         char tmp[sizeof(num) * 3] __aligned(2);
340         int idx, len;
341 
342         /* put_dec() may work incorrectly for num = 0 (generate "", not "") */
343         if (num <= 9) {
344                 tmp[0] = '' + num;
345                 len = 1;
346         } else {
347                 len = put_dec(tmp, num) - tmp;
348         }
349 
350         if (len > size)
351                 return 0;
352         for (idx = 0; idx < len; ++idx)
353                 buf[idx] = tmp[len - idx - 1];
354         return len;
355 }
356 
357 #define SIGN    1               /* unsigned/signed, must be 1 */
358 #define LEFT    2               /* left justified */
359 #define PLUS    4               /* show plus */
360 #define SPACE   8               /* space if plus */
361 #define ZEROPAD 16              /* pad with zero, must be 16 == '' - ' ' */
362 #define SMALL   32              /* use lowercase in hex (must be 32 == 0x20) */
363 #define SPECIAL 64              /* prefix hex with "0x", octal with "" */
364 
365 enum format_type {
366         FORMAT_TYPE_NONE, /* Just a string part */
367         FORMAT_TYPE_WIDTH,
368         FORMAT_TYPE_PRECISION,
369         FORMAT_TYPE_CHAR,
370         FORMAT_TYPE_STR,
371         FORMAT_TYPE_PTR,
372         FORMAT_TYPE_PERCENT_CHAR,
373         FORMAT_TYPE_INVALID,
374         FORMAT_TYPE_LONG_LONG,
375         FORMAT_TYPE_ULONG,
376         FORMAT_TYPE_LONG,
377         FORMAT_TYPE_UBYTE,
378         FORMAT_TYPE_BYTE,
379         FORMAT_TYPE_USHORT,
380         FORMAT_TYPE_SHORT,
381         FORMAT_TYPE_UINT,
382         FORMAT_TYPE_INT,
383         FORMAT_TYPE_SIZE_T,
384         FORMAT_TYPE_PTRDIFF
385 };
386 
387 struct printf_spec {
388         unsigned int    type:8;         /* format_type enum */
389         signed int      field_width:24; /* width of output field */
390         unsigned int    flags:8;        /* flags to number() */
391         unsigned int    base:8;         /* number base, 8, 10 or 16 only */
392         signed int      precision:16;   /* # of digits/chars */
393 } __packed;
394 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
395 #define PRECISION_MAX ((1 << 15) - 1)
396 
397 static noinline_for_stack
398 char *number(char *buf, char *end, unsigned long long num,
399              struct printf_spec spec)
400 {
401         /* put_dec requires 2-byte alignment of the buffer. */
402         char tmp[3 * sizeof(num)] __aligned(2);
403         char sign;
404         char locase;
405         int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
406         int i;
407         bool is_zero = num == 0LL;
408         int field_width = spec.field_width;
409         int precision = spec.precision;
410 
411         BUILD_BUG_ON(sizeof(struct printf_spec) != 8);
412 
413         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
414          * produces same digits or (maybe lowercased) letters */
415         locase = (spec.flags & SMALL);
416         if (spec.flags & LEFT)
417                 spec.flags &= ~ZEROPAD;
418         sign = 0;
419         if (spec.flags & SIGN) {
420                 if ((signed long long)num < 0) {
421                         sign = '-';
422                         num = -(signed long long)num;
423                         field_width--;
424                 } else if (spec.flags & PLUS) {
425                         sign = '+';
426                         field_width--;
427                 } else if (spec.flags & SPACE) {
428                         sign = ' ';
429                         field_width--;
430                 }
431         }
432         if (need_pfx) {
433                 if (spec.base == 16)
434                         field_width -= 2;
435                 else if (!is_zero)
436                         field_width--;
437         }
438 
439         /* generate full string in tmp[], in reverse order */
440         i = 0;
441         if (num < spec.base)
442                 tmp[i++] = hex_asc_upper[num] | locase;
443         else if (spec.base != 10) { /* 8 or 16 */
444                 int mask = spec.base - 1;
445                 int shift = 3;
446 
447                 if (spec.base == 16)
448                         shift = 4;
449                 do {
450                         tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
451                         num >>= shift;
452                 } while (num);
453         } else { /* base 10 */
454                 i = put_dec(tmp, num) - tmp;
455         }
456 
457         /* printing 100 using %2d gives "100", not "00" */
458         if (i > precision)
459                 precision = i;
460         /* leading space padding */
461         field_width -= precision;
462         if (!(spec.flags & (ZEROPAD | LEFT))) {
463                 while (--field_width >= 0) {
464                         if (buf < end)
465                                 *buf = ' ';
466                         ++buf;
467                 }
468         }
469         /* sign */
470         if (sign) {
471                 if (buf < end)
472                         *buf = sign;
473                 ++buf;
474         }
475         /* "0x" / "" prefix */
476         if (need_pfx) {
477                 if (spec.base == 16 || !is_zero) {
478                         if (buf < end)
479                                 *buf = '';
480                         ++buf;
481                 }
482                 if (spec.base == 16) {
483                         if (buf < end)
484                                 *buf = ('X' | locase);
485                         ++buf;
486                 }
487         }
488         /* zero or space padding */
489         if (!(spec.flags & LEFT)) {
490                 char c = ' ' + (spec.flags & ZEROPAD);
491                 BUILD_BUG_ON(' ' + ZEROPAD != '');
492                 while (--field_width >= 0) {
493                         if (buf < end)
494                                 *buf = c;
495                         ++buf;
496                 }
497         }
498         /* hmm even more zero padding? */
499         while (i <= --precision) {
500                 if (buf < end)
501                         *buf = '';
502                 ++buf;
503         }
504         /* actual digits of result */
505         while (--i >= 0) {
506                 if (buf < end)
507                         *buf = tmp[i];
508                 ++buf;
509         }
510         /* trailing space padding */
511         while (--field_width >= 0) {
512                 if (buf < end)
513                         *buf = ' ';
514                 ++buf;
515         }
516 
517         return buf;
518 }
519 
520 static noinline_for_stack
521 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
522 {
523         struct printf_spec spec;
524 
525         spec.type = FORMAT_TYPE_PTR;
526         spec.field_width = 2 + 2 * size;        /* 0x + hex */
527         spec.flags = SPECIAL | SMALL | ZEROPAD;
528         spec.base = 16;
529         spec.precision = -1;
530 
531         return number(buf, end, num, spec);
532 }
533 
534 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
535 {
536         size_t size;
537         if (buf >= end) /* nowhere to put anything */
538                 return;
539         size = end - buf;
540         if (size <= spaces) {
541                 memset(buf, ' ', size);
542                 return;
543         }
544         if (len) {
545                 if (len > size - spaces)
546                         len = size - spaces;
547                 memmove(buf + spaces, buf, len);
548         }
549         memset(buf, ' ', spaces);
550 }
551 
552 /*
553  * Handle field width padding for a string.
554  * @buf: current buffer position
555  * @n: length of string
556  * @end: end of output buffer
557  * @spec: for field width and flags
558  * Returns: new buffer position after padding.
559  */
560 static noinline_for_stack
561 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
562 {
563         unsigned spaces;
564 
565         if (likely(n >= spec.field_width))
566                 return buf;
567         /* we want to pad the sucker */
568         spaces = spec.field_width - n;
569         if (!(spec.flags & LEFT)) {
570                 move_right(buf - n, end, n, spaces);
571                 return buf + spaces;
572         }
573         while (spaces--) {
574                 if (buf < end)
575                         *buf = ' ';
576                 ++buf;
577         }
578         return buf;
579 }
580 
581 static noinline_for_stack
582 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
583 {
584         int len = 0;
585         size_t lim = spec.precision;
586 
587         if ((unsigned long)s < PAGE_SIZE)
588                 s = "(null)";
589 
590         while (lim--) {
591                 char c = *s++;
592                 if (!c)
593                         break;
594                 if (buf < end)
595                         *buf = c;
596                 ++buf;
597                 ++len;
598         }
599         return widen_string(buf, len, end, spec);
600 }
601 
602 static noinline_for_stack
603 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
604                   const char *fmt)
605 {
606         const char *array[4], *s;
607         const struct dentry *p;
608         int depth;
609         int i, n;
610 
611         switch (fmt[1]) {
612                 case '2': case '3': case '4':
613                         depth = fmt[1] - '';
614                         break;
615                 default:
616                         depth = 1;
617         }
618 
619         rcu_read_lock();
620         for (i = 0; i < depth; i++, d = p) {
621                 p = ACCESS_ONCE(d->d_parent);
622                 array[i] = ACCESS_ONCE(d->d_name.name);
623                 if (p == d) {
624                         if (i)
625                                 array[i] = "";
626                         i++;
627                         break;
628                 }
629         }
630         s = array[--i];
631         for (n = 0; n != spec.precision; n++, buf++) {
632                 char c = *s++;
633                 if (!c) {
634                         if (!i)
635                                 break;
636                         c = '/';
637                         s = array[--i];
638                 }
639                 if (buf < end)
640                         *buf = c;
641         }
642         rcu_read_unlock();
643         return widen_string(buf, n, end, spec);
644 }
645 
646 #ifdef CONFIG_BLOCK
647 static noinline_for_stack
648 char *bdev_name(char *buf, char *end, struct block_device *bdev,
649                 struct printf_spec spec, const char *fmt)
650 {
651         struct gendisk *hd = bdev->bd_disk;
652         
653         buf = string(buf, end, hd->disk_name, spec);
654         if (bdev->bd_part->partno) {
655                 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
656                         if (buf < end)
657                                 *buf = 'p';
658                         buf++;
659                 }
660                 buf = number(buf, end, bdev->bd_part->partno, spec);
661         }
662         return buf;
663 }
664 #endif
665 
666 static noinline_for_stack
667 char *symbol_string(char *buf, char *end, void *ptr,
668                     struct printf_spec spec, const char *fmt)
669 {
670         unsigned long value;
671 #ifdef CONFIG_KALLSYMS
672         char sym[KSYM_SYMBOL_LEN];
673 #endif
674 
675         if (fmt[1] == 'R')
676                 ptr = __builtin_extract_return_addr(ptr);
677         value = (unsigned long)ptr;
678 
679 #ifdef CONFIG_KALLSYMS
680         if (*fmt == 'B')
681                 sprint_backtrace(sym, value);
682         else if (*fmt != 'f' && *fmt != 's')
683                 sprint_symbol(sym, value);
684         else
685                 sprint_symbol_no_offset(sym, value);
686 
687         return string(buf, end, sym, spec);
688 #else
689         return special_hex_number(buf, end, value, sizeof(void *));
690 #endif
691 }
692 
693 static noinline_for_stack
694 char *resource_string(char *buf, char *end, struct resource *res,
695                       struct printf_spec spec, const char *fmt)
696 {
697 #ifndef IO_RSRC_PRINTK_SIZE
698 #define IO_RSRC_PRINTK_SIZE     6
699 #endif
700 
701 #ifndef MEM_RSRC_PRINTK_SIZE
702 #define MEM_RSRC_PRINTK_SIZE    10
703 #endif
704         static const struct printf_spec io_spec = {
705                 .base = 16,
706                 .field_width = IO_RSRC_PRINTK_SIZE,
707                 .precision = -1,
708                 .flags = SPECIAL | SMALL | ZEROPAD,
709         };
710         static const struct printf_spec mem_spec = {
711                 .base = 16,
712                 .field_width = MEM_RSRC_PRINTK_SIZE,
713                 .precision = -1,
714                 .flags = SPECIAL | SMALL | ZEROPAD,
715         };
716         static const struct printf_spec bus_spec = {
717                 .base = 16,
718                 .field_width = 2,
719                 .precision = -1,
720                 .flags = SMALL | ZEROPAD,
721         };
722         static const struct printf_spec dec_spec = {
723                 .base = 10,
724                 .precision = -1,
725                 .flags = 0,
726         };
727         static const struct printf_spec str_spec = {
728                 .field_width = -1,
729                 .precision = 10,
730                 .flags = LEFT,
731         };
732         static const struct printf_spec flag_spec = {
733                 .base = 16,
734                 .precision = -1,
735                 .flags = SPECIAL | SMALL,
736         };
737 
738         /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
739          * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
740 #define RSRC_BUF_SIZE           ((2 * sizeof(resource_size_t)) + 4)
741 #define FLAG_BUF_SIZE           (2 * sizeof(res->flags))
742 #define DECODED_BUF_SIZE        sizeof("[mem - 64bit pref window disabled]")
743 #define RAW_BUF_SIZE            sizeof("[mem - flags 0x]")
744         char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
745                      2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
746 
747         char *p = sym, *pend = sym + sizeof(sym);
748         int decode = (fmt[0] == 'R') ? 1 : 0;
749         const struct printf_spec *specp;
750 
751         *p++ = '[';
752         if (res->flags & IORESOURCE_IO) {
753                 p = string(p, pend, "io  ", str_spec);
754                 specp = &io_spec;
755         } else if (res->flags & IORESOURCE_MEM) {
756                 p = string(p, pend, "mem ", str_spec);
757                 specp = &mem_spec;
758         } else if (res->flags & IORESOURCE_IRQ) {
759                 p = string(p, pend, "irq ", str_spec);
760                 specp = &dec_spec;
761         } else if (res->flags & IORESOURCE_DMA) {
762                 p = string(p, pend, "dma ", str_spec);
763                 specp = &dec_spec;
764         } else if (res->flags & IORESOURCE_BUS) {
765                 p = string(p, pend, "bus ", str_spec);
766                 specp = &bus_spec;
767         } else {
768                 p = string(p, pend, "??? ", str_spec);
769                 specp = &mem_spec;
770                 decode = 0;
771         }
772         if (decode && res->flags & IORESOURCE_UNSET) {
773                 p = string(p, pend, "size ", str_spec);
774                 p = number(p, pend, resource_size(res), *specp);
775         } else {
776                 p = number(p, pend, res->start, *specp);
777                 if (res->start != res->end) {
778                         *p++ = '-';
779                         p = number(p, pend, res->end, *specp);
780                 }
781         }
782         if (decode) {
783                 if (res->flags & IORESOURCE_MEM_64)
784                         p = string(p, pend, " 64bit", str_spec);
785                 if (res->flags & IORESOURCE_PREFETCH)
786                         p = string(p, pend, " pref", str_spec);
787                 if (res->flags & IORESOURCE_WINDOW)
788                         p = string(p, pend, " window", str_spec);
789                 if (res->flags & IORESOURCE_DISABLED)
790                         p = string(p, pend, " disabled", str_spec);
791         } else {
792                 p = string(p, pend, " flags ", str_spec);
793                 p = number(p, pend, res->flags, flag_spec);
794         }
795         *p++ = ']';
796         *p = '\0';
797 
798         return string(buf, end, sym, spec);
799 }
800 
801 static noinline_for_stack
802 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
803                  const char *fmt)
804 {
805         int i, len = 1;         /* if we pass '%ph[CDN]', field width remains
806                                    negative value, fallback to the default */
807         char separator;
808 
809         if (spec.field_width == 0)
810                 /* nothing to print */
811                 return buf;
812 
813         if (ZERO_OR_NULL_PTR(addr))
814                 /* NULL pointer */
815                 return string(buf, end, NULL, spec);
816 
817         switch (fmt[1]) {
818         case 'C':
819                 separator = ':';
820                 break;
821         case 'D':
822                 separator = '-';
823                 break;
824         case 'N':
825                 separator = 0;
826                 break;
827         default:
828                 separator = ' ';
829                 break;
830         }
831 
832         if (spec.field_width > 0)
833                 len = min_t(int, spec.field_width, 64);
834 
835         for (i = 0; i < len; ++i) {
836                 if (buf < end)
837                         *buf = hex_asc_hi(addr[i]);
838                 ++buf;
839                 if (buf < end)
840                         *buf = hex_asc_lo(addr[i]);
841                 ++buf;
842 
843                 if (separator && i != len - 1) {
844                         if (buf < end)
845                                 *buf = separator;
846                         ++buf;
847                 }
848         }
849 
850         return buf;
851 }
852 
853 static noinline_for_stack
854 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
855                     struct printf_spec spec, const char *fmt)
856 {
857         const int CHUNKSZ = 32;
858         int nr_bits = max_t(int, spec.field_width, 0);
859         int i, chunksz;
860         bool first = true;
861 
862         /* reused to print numbers */
863         spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
864 
865         chunksz = nr_bits & (CHUNKSZ - 1);
866         if (chunksz == 0)
867                 chunksz = CHUNKSZ;
868 
869         i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
870         for (; i >= 0; i -= CHUNKSZ) {
871                 u32 chunkmask, val;
872                 int word, bit;
873 
874                 chunkmask = ((1ULL << chunksz) - 1);
875                 word = i / BITS_PER_LONG;
876                 bit = i % BITS_PER_LONG;
877                 val = (bitmap[word] >> bit) & chunkmask;
878 
879                 if (!first) {
880                         if (buf < end)
881                                 *buf = ',';
882                         buf++;
883                 }
884                 first = false;
885 
886                 spec.field_width = DIV_ROUND_UP(chunksz, 4);
887                 buf = number(buf, end, val, spec);
888 
889                 chunksz = CHUNKSZ;
890         }
891         return buf;
892 }
893 
894 static noinline_for_stack
895 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
896                          struct printf_spec spec, const char *fmt)
897 {
898         int nr_bits = max_t(int, spec.field_width, 0);
899         /* current bit is 'cur', most recently seen range is [rbot, rtop] */
900         int cur, rbot, rtop;
901         bool first = true;
902 
903         /* reused to print numbers */
904         spec = (struct printf_spec){ .base = 10 };
905 
906         rbot = cur = find_first_bit(bitmap, nr_bits);
907         while (cur < nr_bits) {
908                 rtop = cur;
909                 cur = find_next_bit(bitmap, nr_bits, cur + 1);
910                 if (cur < nr_bits && cur <= rtop + 1)
911                         continue;
912 
913                 if (!first) {
914                         if (buf < end)
915                                 *buf = ',';
916                         buf++;
917                 }
918                 first = false;
919 
920                 buf = number(buf, end, rbot, spec);
921                 if (rbot < rtop) {
922                         if (buf < end)
923                                 *buf = '-';
924                         buf++;
925 
926                         buf = number(buf, end, rtop, spec);
927                 }
928 
929                 rbot = cur;
930         }
931         return buf;
932 }
933 
934 static noinline_for_stack
935 char *mac_address_string(char *buf, char *end, u8 *addr,
936                          struct printf_spec spec, const char *fmt)
937 {
938         char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
939         char *p = mac_addr;
940         int i;
941         char separator;
942         bool reversed = false;
943 
944         switch (fmt[1]) {
945         case 'F':
946                 separator = '-';
947                 break;
948 
949         case 'R':
950                 reversed = true;
951                 /* fall through */
952 
953         default:
954                 separator = ':';
955                 break;
956         }
957 
958         for (i = 0; i < 6; i++) {
959                 if (reversed)
960                         p = hex_byte_pack(p, addr[5 - i]);
961                 else
962                         p = hex_byte_pack(p, addr[i]);
963 
964                 if (fmt[0] == 'M' && i != 5)
965                         *p++ = separator;
966         }
967         *p = '\0';
968 
969         return string(buf, end, mac_addr, spec);
970 }
971 
972 static noinline_for_stack
973 char *ip4_string(char *p, const u8 *addr, const char *fmt)
974 {
975         int i;
976         bool leading_zeros = (fmt[0] == 'i');
977         int index;
978         int step;
979 
980         switch (fmt[2]) {
981         case 'h':
982 #ifdef __BIG_ENDIAN
983                 index = 0;
984                 step = 1;
985 #else
986                 index = 3;
987                 step = -1;
988 #endif
989                 break;
990         case 'l':
991                 index = 3;
992                 step = -1;
993                 break;
994         case 'n':
995         case 'b':
996         default:
997                 index = 0;
998                 step = 1;
999                 break;
1000         }
1001         for (i = 0; i < 4; i++) {
1002                 char temp[4] __aligned(2);      /* hold each IP quad in reverse order */
1003                 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1004                 if (leading_zeros) {
1005                         if (digits < 3)
1006                                 *p++ = '';
1007                         if (digits < 2)
1008                                 *p++ = '';
1009                 }
1010                 /* reverse the digits in the quad */
1011                 while (digits--)
1012                         *p++ = temp[digits];
1013                 if (i < 3)
1014                         *p++ = '.';
1015                 index += step;
1016         }
1017         *p = '\0';
1018 
1019         return p;
1020 }
1021 
1022 static noinline_for_stack
1023 char *ip6_compressed_string(char *p, const char *addr)
1024 {
1025         int i, j, range;
1026         unsigned char zerolength[8];
1027         int longest = 1;
1028         int colonpos = -1;
1029         u16 word;
1030         u8 hi, lo;
1031         bool needcolon = false;
1032         bool useIPv4;
1033         struct in6_addr in6;
1034 
1035         memcpy(&in6, addr, sizeof(struct in6_addr));
1036 
1037         useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1038 
1039         memset(zerolength, 0, sizeof(zerolength));
1040 
1041         if (useIPv4)
1042                 range = 6;
1043         else
1044                 range = 8;
1045 
1046         /* find position of longest 0 run */
1047         for (i = 0; i < range; i++) {
1048                 for (j = i; j < range; j++) {
1049                         if (in6.s6_addr16[j] != 0)
1050                                 break;
1051                         zerolength[i]++;
1052                 }
1053         }
1054         for (i = 0; i < range; i++) {
1055                 if (zerolength[i] > longest) {
1056                         longest = zerolength[i];
1057                         colonpos = i;
1058                 }
1059         }
1060         if (longest == 1)               /* don't compress a single 0 */
1061                 colonpos = -1;
1062 
1063         /* emit address */
1064         for (i = 0; i < range; i++) {
1065                 if (i == colonpos) {
1066                         if (needcolon || i == 0)
1067                                 *p++ = ':';
1068                         *p++ = ':';
1069                         needcolon = false;
1070                         i += longest - 1;
1071                         continue;
1072                 }
1073                 if (needcolon) {
1074                         *p++ = ':';
1075                         needcolon = false;
1076                 }
1077                 /* hex u16 without leading 0s */
1078                 word = ntohs(in6.s6_addr16[i]);
1079                 hi = word >> 8;
1080                 lo = word & 0xff;
1081                 if (hi) {
1082                         if (hi > 0x0f)
1083                                 p = hex_byte_pack(p, hi);
1084                         else
1085                                 *p++ = hex_asc_lo(hi);
1086                         p = hex_byte_pack(p, lo);
1087                 }
1088                 else if (lo > 0x0f)
1089                         p = hex_byte_pack(p, lo);
1090                 else
1091                         *p++ = hex_asc_lo(lo);
1092                 needcolon = true;
1093         }
1094 
1095         if (useIPv4) {
1096                 if (needcolon)
1097                         *p++ = ':';
1098                 p = ip4_string(p, &in6.s6_addr[12], "I4");
1099         }
1100         *p = '\0';
1101 
1102         return p;
1103 }
1104 
1105 static noinline_for_stack
1106 char *ip6_string(char *p, const char *addr, const char *fmt)
1107 {
1108         int i;
1109 
1110         for (i = 0; i < 8; i++) {
1111                 p = hex_byte_pack(p, *addr++);
1112                 p = hex_byte_pack(p, *addr++);
1113                 if (fmt[0] == 'I' && i != 7)
1114                         *p++ = ':';
1115         }
1116         *p = '\0';
1117 
1118         return p;
1119 }
1120 
1121 static noinline_for_stack
1122 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1123                       struct printf_spec spec, const char *fmt)
1124 {
1125         char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1126 
1127         if (fmt[0] == 'I' && fmt[2] == 'c')
1128                 ip6_compressed_string(ip6_addr, addr);
1129         else
1130                 ip6_string(ip6_addr, addr, fmt);
1131 
1132         return string(buf, end, ip6_addr, spec);
1133 }
1134 
1135 static noinline_for_stack
1136 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1137                       struct printf_spec spec, const char *fmt)
1138 {
1139         char ip4_addr[sizeof("255.255.255.255")];
1140 
1141         ip4_string(ip4_addr, addr, fmt);
1142 
1143         return string(buf, end, ip4_addr, spec);
1144 }
1145 
1146 static noinline_for_stack
1147 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1148                          struct printf_spec spec, const char *fmt)
1149 {
1150         bool have_p = false, have_s = false, have_f = false, have_c = false;
1151         char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1152                       sizeof(":12345") + sizeof("/123456789") +
1153                       sizeof("%1234567890")];
1154         char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1155         const u8 *addr = (const u8 *) &sa->sin6_addr;
1156         char fmt6[2] = { fmt[0], '6' };
1157         u8 off = 0;
1158 
1159         fmt++;
1160         while (isalpha(*++fmt)) {
1161                 switch (*fmt) {
1162                 case 'p':
1163                         have_p = true;
1164                         break;
1165                 case 'f':
1166                         have_f = true;
1167                         break;
1168                 case 's':
1169                         have_s = true;
1170                         break;
1171                 case 'c':
1172                         have_c = true;
1173                         break;
1174                 }
1175         }
1176 
1177         if (have_p || have_s || have_f) {
1178                 *p = '[';
1179                 off = 1;
1180         }
1181 
1182         if (fmt6[0] == 'I' && have_c)
1183                 p = ip6_compressed_string(ip6_addr + off, addr);
1184         else
1185                 p = ip6_string(ip6_addr + off, addr, fmt6);
1186 
1187         if (have_p || have_s || have_f)
1188                 *p++ = ']';
1189 
1190         if (have_p) {
1191                 *p++ = ':';
1192                 p = number(p, pend, ntohs(sa->sin6_port), spec);
1193         }
1194         if (have_f) {
1195                 *p++ = '/';
1196                 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1197                                           IPV6_FLOWINFO_MASK), spec);
1198         }
1199         if (have_s) {
1200                 *p++ = '%';
1201                 p = number(p, pend, sa->sin6_scope_id, spec);
1202         }
1203         *p = '\0';
1204 
1205         return string(buf, end, ip6_addr, spec);
1206 }
1207 
1208 static noinline_for_stack
1209 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1210                          struct printf_spec spec, const char *fmt)
1211 {
1212         bool have_p = false;
1213         char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1214         char *pend = ip4_addr + sizeof(ip4_addr);
1215         const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1216         char fmt4[3] = { fmt[0], '4', 0 };
1217 
1218         fmt++;
1219         while (isalpha(*++fmt)) {
1220                 switch (*fmt) {
1221                 case 'p':
1222                         have_p = true;
1223                         break;
1224                 case 'h':
1225                 case 'l':
1226                 case 'n':
1227                 case 'b':
1228                         fmt4[2] = *fmt;
1229                         break;
1230                 }
1231         }
1232 
1233         p = ip4_string(ip4_addr, addr, fmt4);
1234         if (have_p) {
1235                 *p++ = ':';
1236                 p = number(p, pend, ntohs(sa->sin_port), spec);
1237         }
1238         *p = '\0';
1239 
1240         return string(buf, end, ip4_addr, spec);
1241 }
1242 
1243 static noinline_for_stack
1244 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1245                      const char *fmt)
1246 {
1247         bool found = true;
1248         int count = 1;
1249         unsigned int flags = 0;
1250         int len;
1251 
1252         if (spec.field_width == 0)
1253                 return buf;                             /* nothing to print */
1254 
1255         if (ZERO_OR_NULL_PTR(addr))
1256                 return string(buf, end, NULL, spec);    /* NULL pointer */
1257 
1258 
1259         do {
1260                 switch (fmt[count++]) {
1261                 case 'a':
1262                         flags |= ESCAPE_ANY;
1263                         break;
1264                 case 'c':
1265                         flags |= ESCAPE_SPECIAL;
1266                         break;
1267                 case 'h':
1268                         flags |= ESCAPE_HEX;
1269                         break;
1270                 case 'n':
1271                         flags |= ESCAPE_NULL;
1272                         break;
1273                 case 'o':
1274                         flags |= ESCAPE_OCTAL;
1275                         break;
1276                 case 'p':
1277                         flags |= ESCAPE_NP;
1278                         break;
1279                 case 's':
1280                         flags |= ESCAPE_SPACE;
1281                         break;
1282                 default:
1283                         found = false;
1284                         break;
1285                 }
1286         } while (found);
1287 
1288         if (!flags)
1289                 flags = ESCAPE_ANY_NP;
1290 
1291         len = spec.field_width < 0 ? 1 : spec.field_width;
1292 
1293         /*
1294          * string_escape_mem() writes as many characters as it can to
1295          * the given buffer, and returns the total size of the output
1296          * had the buffer been big enough.
1297          */
1298         buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1299 
1300         return buf;
1301 }
1302 
1303 static noinline_for_stack
1304 char *uuid_string(char *buf, char *end, const u8 *addr,
1305                   struct printf_spec spec, const char *fmt)
1306 {
1307         char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
1308         char *p = uuid;
1309         int i;
1310         static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
1311         static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
1312         const u8 *index = be;
1313         bool uc = false;
1314 
1315         switch (*(++fmt)) {
1316         case 'L':
1317                 uc = true;              /* fall-through */
1318         case 'l':
1319                 index = le;
1320                 break;
1321         case 'B':
1322                 uc = true;
1323                 break;
1324         }
1325 
1326         for (i = 0; i < 16; i++) {
1327                 p = hex_byte_pack(p, addr[index[i]]);
1328                 switch (i) {
1329                 case 3:
1330                 case 5:
1331                 case 7:
1332                 case 9:
1333                         *p++ = '-';
1334                         break;
1335                 }
1336         }
1337 
1338         *p = 0;
1339 
1340         if (uc) {
1341                 p = uuid;
1342                 do {
1343                         *p = toupper(*p);
1344                 } while (*(++p));
1345         }
1346 
1347         return string(buf, end, uuid, spec);
1348 }
1349 
1350 static noinline_for_stack
1351 char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt)
1352 {
1353         unsigned long long num;
1354         int size;
1355 
1356         switch (fmt[1]) {
1357         case 'F':
1358                 num = *(const netdev_features_t *)addr;
1359                 size = sizeof(netdev_features_t);
1360                 break;
1361         default:
1362                 num = (unsigned long)addr;
1363                 size = sizeof(unsigned long);
1364                 break;
1365         }
1366 
1367         return special_hex_number(buf, end, num, size);
1368 }
1369 
1370 static noinline_for_stack
1371 char *address_val(char *buf, char *end, const void *addr, const char *fmt)
1372 {
1373         unsigned long long num;
1374         int size;
1375 
1376         switch (fmt[1]) {
1377         case 'd':
1378                 num = *(const dma_addr_t *)addr;
1379                 size = sizeof(dma_addr_t);
1380                 break;
1381         case 'p':
1382         default:
1383                 num = *(const phys_addr_t *)addr;
1384                 size = sizeof(phys_addr_t);
1385                 break;
1386         }
1387 
1388         return special_hex_number(buf, end, num, size);
1389 }
1390 
1391 static noinline_for_stack
1392 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1393             const char *fmt)
1394 {
1395         if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
1396                 return string(buf, end, NULL, spec);
1397 
1398         switch (fmt[1]) {
1399         case 'r':
1400                 return number(buf, end, clk_get_rate(clk), spec);
1401 
1402         case 'n':
1403         default:
1404 #ifdef CONFIG_COMMON_CLK
1405                 return string(buf, end, __clk_get_name(clk), spec);
1406 #else
1407                 return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long));
1408 #endif
1409         }
1410 }
1411 
1412 static
1413 char *format_flags(char *buf, char *end, unsigned long flags,
1414                                         const struct trace_print_flags *names)
1415 {
1416         unsigned long mask;
1417         const struct printf_spec strspec = {
1418                 .field_width = -1,
1419                 .precision = -1,
1420         };
1421         const struct printf_spec numspec = {
1422                 .flags = SPECIAL|SMALL,
1423                 .field_width = -1,
1424                 .precision = -1,
1425                 .base = 16,
1426         };
1427 
1428         for ( ; flags && names->name; names++) {
1429                 mask = names->mask;
1430                 if ((flags & mask) != mask)
1431                         continue;
1432 
1433                 buf = string(buf, end, names->name, strspec);
1434 
1435                 flags &= ~mask;
1436                 if (flags) {
1437                         if (buf < end)
1438                                 *buf = '|';
1439                         buf++;
1440                 }
1441         }
1442 
1443         if (flags)
1444                 buf = number(buf, end, flags, numspec);
1445 
1446         return buf;
1447 }
1448 
1449 static noinline_for_stack
1450 char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
1451 {
1452         unsigned long flags;
1453         const struct trace_print_flags *names;
1454 
1455         switch (fmt[1]) {
1456         case 'p':
1457                 flags = *(unsigned long *)flags_ptr;
1458                 /* Remove zone id */
1459                 flags &= (1UL << NR_PAGEFLAGS) - 1;
1460                 names = pageflag_names;
1461                 break;
1462         case 'v':
1463                 flags = *(unsigned long *)flags_ptr;
1464                 names = vmaflag_names;
1465                 break;
1466         case 'g':
1467                 flags = *(gfp_t *)flags_ptr;
1468                 names = gfpflag_names;
1469                 break;
1470         default:
1471                 WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]);
1472                 return buf;
1473         }
1474 
1475         return format_flags(buf, end, flags, names);
1476 }
1477 
1478 int kptr_restrict __read_mostly;
1479 
1480 /*
1481  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
1482  * by an extra set of alphanumeric characters that are extended format
1483  * specifiers.
1484  *
1485  * Right now we handle:
1486  *
1487  * - 'F' For symbolic function descriptor pointers with offset
1488  * - 'f' For simple symbolic function names without offset
1489  * - 'S' For symbolic direct pointers with offset
1490  * - 's' For symbolic direct pointers without offset
1491  * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1492  * - 'B' For backtraced symbolic direct pointers with offset
1493  * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1494  * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1495  * - 'b[l]' For a bitmap, the number of bits is determined by the field
1496  *       width which must be explicitly specified either as part of the
1497  *       format string '%32b[l]' or through '%*b[l]', [l] selects
1498  *       range-list format instead of hex format
1499  * - 'M' For a 6-byte MAC address, it prints the address in the
1500  *       usual colon-separated hex notation
1501  * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1502  * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1503  *       with a dash-separated hex notation
1504  * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1505  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1506  *       IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1507  *       IPv6 uses colon separated network-order 16 bit hex with leading 0's
1508  *       [S][pfs]
1509  *       Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1510  *       [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1511  * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1512  *       IPv6 omits the colons (01020304...0f)
1513  *       IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1514  *       [S][pfs]
1515  *       Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1516  *       [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1517  * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1518  * - 'I[6S]c' for IPv6 addresses printed as specified by
1519  *       http://tools.ietf.org/html/rfc5952
1520  * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
1521  *                of the following flags (see string_escape_mem() for the
1522  *                details):
1523  *                  a - ESCAPE_ANY
1524  *                  c - ESCAPE_SPECIAL
1525  *                  h - ESCAPE_HEX
1526  *                  n - ESCAPE_NULL
1527  *                  o - ESCAPE_OCTAL
1528  *                  p - ESCAPE_NP
1529  *                  s - ESCAPE_SPACE
1530  *                By default ESCAPE_ANY_NP is used.
1531  * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1532  *       "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1533  *       Options for %pU are:
1534  *         b big endian lower case hex (default)
1535  *         B big endian UPPER case hex
1536  *         l little endian lower case hex
1537  *         L little endian UPPER case hex
1538  *           big endian output byte order is:
1539  *             [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1540  *           little endian output byte order is:
1541  *             [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1542  * - 'V' For a struct va_format which contains a format string * and va_list *,
1543  *       call vsnprintf(->format, *->va_list).
1544  *       Implements a "recursive vsnprintf".
1545  *       Do not use this feature without some mechanism to verify the
1546  *       correctness of the format string and va_list arguments.
1547  * - 'K' For a kernel pointer that should be hidden from unprivileged users
1548  * - 'NF' For a netdev_features_t
1549  * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1550  *            a certain separator (' ' by default):
1551  *              C colon
1552  *              D dash
1553  *              N no separator
1554  *            The maximum supported length is 64 bytes of the input. Consider
1555  *            to use print_hex_dump() for the larger input.
1556  * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
1557  *           (default assumed to be phys_addr_t, passed by reference)
1558  * - 'd[234]' For a dentry name (optionally 2-4 last components)
1559  * - 'D[234]' Same as 'd' but for a struct file
1560  * - 'g' For block_device name (gendisk + partition number)
1561  * - 'C' For a clock, it prints the name (Common Clock Framework) or address
1562  *       (legacy clock framework) of the clock
1563  * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
1564  *        (legacy clock framework) of the clock
1565  * - 'Cr' For a clock, it prints the current rate of the clock
1566  * - 'G' For flags to be printed as a collection of symbolic strings that would
1567  *       construct the specific value. Supported flags given by option:
1568  *       p page flags (see struct page) given as pointer to unsigned long
1569  *       g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
1570  *       v vma flags (VM_*) given as pointer to unsigned long
1571  *
1572  * ** Please update also Documentation/printk-formats.txt when making changes **
1573  *
1574  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1575  * function pointers are really function descriptors, which contain a
1576  * pointer to the real address.
1577  */
1578 static noinline_for_stack
1579 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
1580               struct printf_spec spec)
1581 {
1582         const int default_width = 2 * sizeof(void *);
1583 
1584         if (!ptr && *fmt != 'K') {
1585                 /*
1586                  * Print (null) with the same width as a pointer so it makes
1587                  * tabular output look nice.
1588                  */
1589                 if (spec.field_width == -1)
1590                         spec.field_width = default_width;
1591                 return string(buf, end, "(null)", spec);
1592         }
1593 
1594         switch (*fmt) {
1595         case 'F':
1596         case 'f':
1597                 ptr = dereference_function_descriptor(ptr);
1598                 /* Fallthrough */
1599         case 'S':
1600         case 's':
1601         case 'B':
1602                 return symbol_string(buf, end, ptr, spec, fmt);
1603         case 'R':
1604         case 'r':
1605                 return resource_string(buf, end, ptr, spec, fmt);
1606         case 'h':
1607                 return hex_string(buf, end, ptr, spec, fmt);
1608         case 'b':
1609                 switch (fmt[1]) {
1610                 case 'l':
1611                         return bitmap_list_string(buf, end, ptr, spec, fmt);
1612                 default:
1613                         return bitmap_string(buf, end, ptr, spec, fmt);
1614                 }
1615         case 'M':                       /* Colon separated: 00:01:02:03:04:05 */
1616         case 'm':                       /* Contiguous: 000102030405 */
1617                                         /* [mM]F (FDDI) */
1618                                         /* [mM]R (Reverse order; Bluetooth) */
1619                 return mac_address_string(buf, end, ptr, spec, fmt);
1620         case 'I':                       /* Formatted IP supported
1621                                          * 4:   1.2.3.4
1622                                          * 6:   0001:0203:...:0708
1623                                          * 6c:  1::708 or 1::1.2.3.4
1624                                          */
1625         case 'i':                       /* Contiguous:
1626                                          * 4:   001.002.003.004
1627                                          * 6:   000102...0f
1628                                          */
1629                 switch (fmt[1]) {
1630                 case '6':
1631                         return ip6_addr_string(buf, end, ptr, spec, fmt);
1632                 case '4':
1633                         return ip4_addr_string(buf, end, ptr, spec, fmt);
1634                 case 'S': {
1635                         const union {
1636                                 struct sockaddr         raw;
1637                                 struct sockaddr_in      v4;
1638                                 struct sockaddr_in6     v6;
1639                         } *sa = ptr;
1640 
1641                         switch (sa->raw.sa_family) {
1642                         case AF_INET:
1643                                 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1644                         case AF_INET6:
1645                                 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1646                         default:
1647                                 return string(buf, end, "(invalid address)", spec);
1648                         }}
1649                 }
1650                 break;
1651         case 'E':
1652                 return escaped_string(buf, end, ptr, spec, fmt);
1653         case 'U':
1654                 return uuid_string(buf, end, ptr, spec, fmt);
1655         case 'V':
1656                 {
1657                         va_list va;
1658 
1659                         va_copy(va, *((struct va_format *)ptr)->va);
1660                         buf += vsnprintf(buf, end > buf ? end - buf : 0,
1661                                          ((struct va_format *)ptr)->fmt, va);
1662                         va_end(va);
1663                         return buf;
1664                 }
1665         case 'K':
1666                 switch (kptr_restrict) {
1667                 case 0:
1668                         /* Always print %pK values */
1669                         break;
1670                 case 1: {
1671                         const struct cred *cred;
1672 
1673                         /*
1674                          * kptr_restrict==1 cannot be used in IRQ context
1675                          * because its test for CAP_SYSLOG would be meaningless.
1676                          */
1677                         if (in_irq() || in_serving_softirq() || in_nmi()) {
1678                                 if (spec.field_width == -1)
1679                                         spec.field_width = default_width;
1680                                 return string(buf, end, "pK-error", spec);
1681                         }
1682 
1683                         /*
1684                          * Only print the real pointer value if the current
1685                          * process has CAP_SYSLOG and is running with the
1686                          * same credentials it started with. This is because
1687                          * access to files is checked at open() time, but %pK
1688                          * checks permission at read() time. We don't want to
1689                          * leak pointer values if a binary opens a file using
1690                          * %pK and then elevates privileges before reading it.
1691                          */
1692                         cred = current_cred();
1693                         if (!has_capability_noaudit(current, CAP_SYSLOG) ||
1694                             !uid_eq(cred->euid, cred->uid) ||
1695                             !gid_eq(cred->egid, cred->gid))
1696                                 ptr = NULL;
1697                         break;
1698                 }
1699                 case 2:
1700                 default:
1701                         /* Always print 0's for %pK */
1702                         ptr = NULL;
1703                         break;
1704                 }
1705                 break;
1706 
1707         case 'N':
1708                 return netdev_bits(buf, end, ptr, fmt);
1709         case 'a':
1710                 return address_val(buf, end, ptr, fmt);
1711         case 'd':
1712                 return dentry_name(buf, end, ptr, spec, fmt);
1713         case 'C':
1714                 return clock(buf, end, ptr, spec, fmt);
1715         case 'D':
1716                 return dentry_name(buf, end,
1717                                    ((const struct file *)ptr)->f_path.dentry,
1718                                    spec, fmt);
1719 #ifdef CONFIG_BLOCK
1720         case 'g':
1721                 return bdev_name(buf, end, ptr, spec, fmt);
1722 #endif
1723 
1724         case 'G':
1725                 return flags_string(buf, end, ptr, fmt);
1726         }
1727         spec.flags |= SMALL;
1728         if (spec.field_width == -1) {
1729                 spec.field_width = default_width;
1730                 spec.flags |= ZEROPAD;
1731         }
1732         spec.base = 16;
1733 
1734         return number(buf, end, (unsigned long) ptr, spec);
1735 }
1736 
1737 /*
1738  * Helper function to decode printf style format.
1739  * Each call decode a token from the format and return the
1740  * number of characters read (or likely the delta where it wants
1741  * to go on the next call).
1742  * The decoded token is returned through the parameters
1743  *
1744  * 'h', 'l', or 'L' for integer fields
1745  * 'z' support added 23/7/1999 S.H.
1746  * 'z' changed to 'Z' --davidm 1/25/99
1747  * 't' added for ptrdiff_t
1748  *
1749  * @fmt: the format string
1750  * @type of the token returned
1751  * @flags: various flags such as +, -, # tokens..
1752  * @field_width: overwritten width
1753  * @base: base of the number (octal, hex, ...)
1754  * @precision: precision of a number
1755  * @qualifier: qualifier of a number (long, size_t, ...)
1756  */
1757 static noinline_for_stack
1758 int format_decode(const char *fmt, struct printf_spec *spec)
1759 {
1760         const char *start = fmt;
1761         char qualifier;
1762 
1763         /* we finished early by reading the field width */
1764         if (spec->type == FORMAT_TYPE_WIDTH) {
1765                 if (spec->field_width < 0) {
1766                         spec->field_width = -spec->field_width;
1767                         spec->flags |= LEFT;
1768                 }
1769                 spec->type = FORMAT_TYPE_NONE;
1770                 goto precision;
1771         }
1772 
1773         /* we finished early by reading the precision */
1774         if (spec->type == FORMAT_TYPE_PRECISION) {
1775                 if (spec->precision < 0)
1776                         spec->precision = 0;
1777 
1778                 spec->type = FORMAT_TYPE_NONE;
1779                 goto qualifier;
1780         }
1781 
1782         /* By default */
1783         spec->type = FORMAT_TYPE_NONE;
1784 
1785         for (; *fmt ; ++fmt) {
1786                 if (*fmt == '%')
1787                         break;
1788         }
1789 
1790         /* Return the current non-format string */
1791         if (fmt != start || !*fmt)
1792                 return fmt - start;
1793 
1794         /* Process flags */
1795         spec->flags = 0;
1796 
1797         while (1) { /* this also skips first '%' */
1798                 bool found = true;
1799 
1800                 ++fmt;
1801 
1802                 switch (*fmt) {
1803                 case '-': spec->flags |= LEFT;    break;
1804                 case '+': spec->flags |= PLUS;    break;
1805                 case ' ': spec->flags |= SPACE;   break;
1806                 case '#': spec->flags |= SPECIAL; break;
1807                 case '': spec->flags |= ZEROPAD; break;
1808                 default:  found = false;
1809                 }
1810 
1811                 if (!found)
1812                         break;
1813         }
1814 
1815         /* get field width */
1816         spec->field_width = -1;
1817 
1818         if (isdigit(*fmt))
1819                 spec->field_width = skip_atoi(&fmt);
1820         else if (*fmt == '*') {
1821                 /* it's the next argument */
1822                 spec->type = FORMAT_TYPE_WIDTH;
1823                 return ++fmt - start;
1824         }
1825 
1826 precision:
1827         /* get the precision */
1828         spec->precision = -1;
1829         if (*fmt == '.') {
1830                 ++fmt;
1831                 if (isdigit(*fmt)) {
1832                         spec->precision = skip_atoi(&fmt);
1833                         if (spec->precision < 0)
1834                                 spec->precision = 0;
1835                 } else if (*fmt == '*') {
1836                         /* it's the next argument */
1837                         spec->type = FORMAT_TYPE_PRECISION;
1838                         return ++fmt - start;
1839                 }
1840         }
1841 
1842 qualifier:
1843         /* get the conversion qualifier */
1844         qualifier = 0;
1845         if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1846             _tolower(*fmt) == 'z' || *fmt == 't') {
1847                 qualifier = *fmt++;
1848                 if (unlikely(qualifier == *fmt)) {
1849                         if (qualifier == 'l') {
1850                                 qualifier = 'L';
1851                                 ++fmt;
1852                         } else if (qualifier == 'h') {
1853                                 qualifier = 'H';
1854                                 ++fmt;
1855                         }
1856                 }
1857         }
1858 
1859         /* default base */
1860         spec->base = 10;
1861         switch (*fmt) {
1862         case 'c':
1863                 spec->type = FORMAT_TYPE_CHAR;
1864                 return ++fmt - start;
1865 
1866         case 's':
1867                 spec->type = FORMAT_TYPE_STR;
1868                 return ++fmt - start;
1869 
1870         case 'p':
1871                 spec->type = FORMAT_TYPE_PTR;
1872                 return ++fmt - start;
1873 
1874         case '%':
1875                 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1876                 return ++fmt - start;
1877 
1878         /* integer number formats - set up the flags and "break" */
1879         case 'o':
1880                 spec->base = 8;
1881                 break;
1882 
1883         case 'x':
1884                 spec->flags |= SMALL;
1885 
1886         case 'X':
1887                 spec->base = 16;
1888                 break;
1889 
1890         case 'd':
1891         case 'i':
1892                 spec->flags |= SIGN;
1893         case 'u':
1894                 break;
1895 
1896         case 'n':
1897                 /*
1898                  * Since %n poses a greater security risk than
1899                  * utility, treat it as any other invalid or
1900                  * unsupported format specifier.
1901                  */
1902                 /* Fall-through */
1903 
1904         default:
1905                 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
1906                 spec->type = FORMAT_TYPE_INVALID;
1907                 return fmt - start;
1908         }
1909 
1910         if (qualifier == 'L')
1911                 spec->type = FORMAT_TYPE_LONG_LONG;
1912         else if (qualifier == 'l') {
1913                 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
1914                 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
1915         } else if (_tolower(qualifier) == 'z') {
1916                 spec->type = FORMAT_TYPE_SIZE_T;
1917         } else if (qualifier == 't') {
1918                 spec->type = FORMAT_TYPE_PTRDIFF;
1919         } else if (qualifier == 'H') {
1920                 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
1921                 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
1922         } else if (qualifier == 'h') {
1923                 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
1924                 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
1925         } else {
1926                 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
1927                 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
1928         }
1929 
1930         return ++fmt - start;
1931 }
1932 
1933 static void
1934 set_field_width(struct printf_spec *spec, int width)
1935 {
1936         spec->field_width = width;
1937         if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
1938                 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
1939         }
1940 }
1941 
1942 static void
1943 set_precision(struct printf_spec *spec, int prec)
1944 {
1945         spec->precision = prec;
1946         if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
1947                 spec->precision = clamp(prec, 0, PRECISION_MAX);
1948         }
1949 }
1950 
1951 /**
1952  * vsnprintf - Format a string and place it in a buffer
1953  * @buf: The buffer to place the result into
1954  * @size: The size of the buffer, including the trailing null space
1955  * @fmt: The format string to use
1956  * @args: Arguments for the format string
1957  *
1958  * This function generally follows C99 vsnprintf, but has some
1959  * extensions and a few limitations:
1960  *
1961  * %n is unsupported
1962  * %p* is handled by pointer()
1963  *
1964  * See pointer() or Documentation/printk-formats.txt for more
1965  * extensive description.
1966  *
1967  * ** Please update the documentation in both places when making changes **
1968  *
1969  * The return value is the number of characters which would
1970  * be generated for the given input, excluding the trailing
1971  * '\0', as per ISO C99. If you want to have the exact
1972  * number of characters written into @buf as return value
1973  * (not including the trailing '\0'), use vscnprintf(). If the
1974  * return is greater than or equal to @size, the resulting
1975  * string is truncated.
1976  *
1977  * If you're not already dealing with a va_list consider using snprintf().
1978  */
1979 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1980 {
1981         unsigned long long num;
1982         char *str, *end;
1983         struct printf_spec spec = {0};
1984 
1985         /* Reject out-of-range values early.  Large positive sizes are
1986            used for unknown buffer sizes. */
1987         if (WARN_ON_ONCE(size > INT_MAX))
1988                 return 0;
1989 
1990         str = buf;
1991         end = buf + size;
1992 
1993         /* Make sure end is always >= buf */
1994         if (end < buf) {
1995                 end = ((void *)-1);
1996                 size = end - buf;
1997         }
1998 
1999         while (*fmt) {
2000                 const char *old_fmt = fmt;
2001                 int read = format_decode(fmt, &spec);
2002 
2003                 fmt += read;
2004 
2005                 switch (spec.type) {
2006                 case FORMAT_TYPE_NONE: {
2007                         int copy = read;
2008                         if (str < end) {
2009                                 if (copy > end - str)
2010                                         copy = end - str;
2011                                 memcpy(str, old_fmt, copy);
2012                         }
2013                         str += read;
2014                         break;
2015                 }
2016 
2017                 case FORMAT_TYPE_WIDTH:
2018                         set_field_width(&spec, va_arg(args, int));
2019                         break;
2020 
2021                 case FORMAT_TYPE_PRECISION:
2022                         set_precision(&spec, va_arg(args, int));
2023                         break;
2024 
2025                 case FORMAT_TYPE_CHAR: {
2026                         char c;
2027 
2028                         if (!(spec.flags & LEFT)) {
2029                                 while (--spec.field_width > 0) {
2030                                         if (str < end)
2031                                                 *str = ' ';
2032                                         ++str;
2033 
2034                                 }
2035                         }
2036                         c = (unsigned char) va_arg(args, int);
2037                         if (str < end)
2038                                 *str = c;
2039                         ++str;
2040                         while (--spec.field_width > 0) {
2041                                 if (str < end)
2042                                         *str = ' ';
2043                                 ++str;
2044                         }
2045                         break;
2046                 }
2047 
2048                 case FORMAT_TYPE_STR:
2049                         str = string(str, end, va_arg(args, char *), spec);
2050                         break;
2051 
2052                 case FORMAT_TYPE_PTR:
2053                         str = pointer(fmt, str, end, va_arg(args, void *),
2054                                       spec);
2055                         while (isalnum(*fmt))
2056                                 fmt++;
2057                         break;
2058 
2059                 case FORMAT_TYPE_PERCENT_CHAR:
2060                         if (str < end)
2061                                 *str = '%';
2062                         ++str;
2063                         break;
2064 
2065                 case FORMAT_TYPE_INVALID:
2066                         /*
2067                          * Presumably the arguments passed gcc's type
2068                          * checking, but there is no safe or sane way
2069                          * for us to continue parsing the format and
2070                          * fetching from the va_list; the remaining
2071                          * specifiers and arguments would be out of
2072                          * sync.
2073                          */
2074                         goto out;
2075 
2076                 default:
2077                         switch (spec.type) {
2078                         case FORMAT_TYPE_LONG_LONG:
2079                                 num = va_arg(args, long long);
2080                                 break;
2081                         case FORMAT_TYPE_ULONG:
2082                                 num = va_arg(args, unsigned long);
2083                                 break;
2084                         case FORMAT_TYPE_LONG:
2085                                 num = va_arg(args, long);
2086                                 break;
2087                         case FORMAT_TYPE_SIZE_T:
2088                                 if (spec.flags & SIGN)
2089                                         num = va_arg(args, ssize_t);
2090                                 else
2091                                         num = va_arg(args, size_t);
2092                                 break;
2093                         case FORMAT_TYPE_PTRDIFF:
2094                                 num = va_arg(args, ptrdiff_t);
2095                                 break;
2096                         case FORMAT_TYPE_UBYTE:
2097                                 num = (unsigned char) va_arg(args, int);
2098                                 break;
2099                         case FORMAT_TYPE_BYTE:
2100                                 num = (signed char) va_arg(args, int);
2101                                 break;
2102                         case FORMAT_TYPE_USHORT:
2103                                 num = (unsigned short) va_arg(args, int);
2104                                 break;
2105                         case FORMAT_TYPE_SHORT:
2106                                 num = (short) va_arg(args, int);
2107                                 break;
2108                         case FORMAT_TYPE_INT:
2109                                 num = (int) va_arg(args, int);
2110                                 break;
2111                         default:
2112                                 num = va_arg(args, unsigned int);
2113                         }
2114 
2115                         str = number(str, end, num, spec);
2116                 }
2117         }
2118 
2119 out:
2120         if (size > 0) {
2121                 if (str < end)
2122                         *str = '\0';
2123                 else
2124                         end[-1] = '\0';
2125         }
2126 
2127         /* the trailing null byte doesn't count towards the total */
2128         return str-buf;
2129 
2130 }
2131 EXPORT_SYMBOL(vsnprintf);
2132 
2133 /**
2134  * vscnprintf - Format a string and place it in a buffer
2135  * @buf: The buffer to place the result into
2136  * @size: The size of the buffer, including the trailing null space
2137  * @fmt: The format string to use
2138  * @args: Arguments for the format string
2139  *
2140  * The return value is the number of characters which have been written into
2141  * the @buf not including the trailing '\0'. If @size is == 0 the function
2142  * returns 0.
2143  *
2144  * If you're not already dealing with a va_list consider using scnprintf().
2145  *
2146  * See the vsnprintf() documentation for format string extensions over C99.
2147  */
2148 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2149 {
2150         int i;
2151 
2152         i = vsnprintf(buf, size, fmt, args);
2153 
2154         if (likely(i < size))
2155                 return i;
2156         if (size != 0)
2157                 return size - 1;
2158         return 0;
2159 }
2160 EXPORT_SYMBOL(vscnprintf);
2161 
2162 /**
2163  * snprintf - Format a string and place it in a buffer
2164  * @buf: The buffer to place the result into
2165  * @size: The size of the buffer, including the trailing null space
2166  * @fmt: The format string to use
2167  * @...: Arguments for the format string
2168  *
2169  * The return value is the number of characters which would be
2170  * generated for the given input, excluding the trailing null,
2171  * as per ISO C99.  If the return is greater than or equal to
2172  * @size, the resulting string is truncated.
2173  *
2174  * See the vsnprintf() documentation for format string extensions over C99.
2175  */
2176 int snprintf(char *buf, size_t size, const char *fmt, ...)
2177 {
2178         va_list args;
2179         int i;
2180 
2181         va_start(args, fmt);
2182         i = vsnprintf(buf, size, fmt, args);
2183         va_end(args);
2184 
2185         return i;
2186 }
2187 EXPORT_SYMBOL(snprintf);
2188 
2189 /**
2190  * scnprintf - Format a string and place it in a buffer
2191  * @buf: The buffer to place the result into
2192  * @size: The size of the buffer, including the trailing null space
2193  * @fmt: The format string to use
2194  * @...: Arguments for the format string
2195  *
2196  * The return value is the number of characters written into @buf not including
2197  * the trailing '\0'. If @size is == 0 the function returns 0.
2198  */
2199 
2200 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2201 {
2202         va_list args;
2203         int i;
2204 
2205         va_start(args, fmt);
2206         i = vscnprintf(buf, size, fmt, args);
2207         va_end(args);
2208 
2209         return i;
2210 }
2211 EXPORT_SYMBOL(scnprintf);
2212 
2213 /**
2214  * vsprintf - Format a string and place it in a buffer
2215  * @buf: The buffer to place the result into
2216  * @fmt: The format string to use
2217  * @args: Arguments for the format string
2218  *
2219  * The function returns the number of characters written
2220  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2221  * buffer overflows.
2222  *
2223  * If you're not already dealing with a va_list consider using sprintf().
2224  *
2225  * See the vsnprintf() documentation for format string extensions over C99.
2226  */
2227 int vsprintf(char *buf, const char *fmt, va_list args)
2228 {
2229         return vsnprintf(buf, INT_MAX, fmt, args);
2230 }
2231 EXPORT_SYMBOL(vsprintf);
2232 
2233 /**
2234  * sprintf - Format a string and place it in a buffer
2235  * @buf: The buffer to place the result into
2236  * @fmt: The format string to use
2237  * @...: Arguments for the format string
2238  *
2239  * The function returns the number of characters written
2240  * into @buf. Use snprintf() or scnprintf() in order to avoid
2241  * buffer overflows.
2242  *
2243  * See the vsnprintf() documentation for format string extensions over C99.
2244  */
2245 int sprintf(char *buf, const char *fmt, ...)
2246 {
2247         va_list args;
2248         int i;
2249 
2250         va_start(args, fmt);
2251         i = vsnprintf(buf, INT_MAX, fmt, args);
2252         va_end(args);
2253 
2254         return i;
2255 }
2256 EXPORT_SYMBOL(sprintf);
2257 
2258 #ifdef CONFIG_BINARY_PRINTF
2259 /*
2260  * bprintf service:
2261  * vbin_printf() - VA arguments to binary data
2262  * bstr_printf() - Binary data to text string
2263  */
2264 
2265 /**
2266  * vbin_printf - Parse a format string and place args' binary value in a buffer
2267  * @bin_buf: The buffer to place args' binary value
2268  * @size: The size of the buffer(by words(32bits), not characters)
2269  * @fmt: The format string to use
2270  * @args: Arguments for the format string
2271  *
2272  * The format follows C99 vsnprintf, except %n is ignored, and its argument
2273  * is skipped.
2274  *
2275  * The return value is the number of words(32bits) which would be generated for
2276  * the given input.
2277  *
2278  * NOTE:
2279  * If the return value is greater than @size, the resulting bin_buf is NOT
2280  * valid for bstr_printf().
2281  */
2282 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
2283 {
2284         struct printf_spec spec = {0};
2285         char *str, *end;
2286 
2287         str = (char *)bin_buf;
2288         end = (char *)(bin_buf + size);
2289 
2290 #define save_arg(type)                                                  \
2291 do {                                                                    \
2292         if (sizeof(type) == 8) {                                        \
2293                 unsigned long long value;                               \
2294                 str = PTR_ALIGN(str, sizeof(u32));                      \
2295                 value = va_arg(args, unsigned long long);               \
2296                 if (str + sizeof(type) <= end) {                        \
2297                         *(u32 *)str = *(u32 *)&value;                   \
2298                         *(u32 *)(str + 4) = *((u32 *)&value + 1);       \
2299                 }                                                       \
2300         } else {                                                        \
2301                 unsigned long value;                                    \
2302                 str = PTR_ALIGN(str, sizeof(type));                     \
2303                 value = va_arg(args, int);                              \
2304                 if (str + sizeof(type) <= end)                          \
2305                         *(typeof(type) *)str = (type)value;             \
2306         }                                                               \
2307         str += sizeof(type);                                            \
2308 } while (0)
2309 
2310         while (*fmt) {
2311                 int read = format_decode(fmt, &spec);
2312 
2313                 fmt += read;
2314 
2315                 switch (spec.type) {
2316                 case FORMAT_TYPE_NONE:
2317                 case FORMAT_TYPE_PERCENT_CHAR:
2318                         break;
2319                 case FORMAT_TYPE_INVALID:
2320                         goto out;
2321 
2322                 case FORMAT_TYPE_WIDTH:
2323                 case FORMAT_TYPE_PRECISION:
2324                         save_arg(int);
2325                         break;
2326 
2327                 case FORMAT_TYPE_CHAR:
2328                         save_arg(char);
2329                         break;
2330 
2331                 case FORMAT_TYPE_STR: {
2332                         const char *save_str = va_arg(args, char *);
2333                         size_t len;
2334 
2335                         if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
2336                                         || (unsigned long)save_str < PAGE_SIZE)
2337                                 save_str = "(null)";
2338                         len = strlen(save_str) + 1;
2339                         if (str + len < end)
2340                                 memcpy(str, save_str, len);
2341                         str += len;
2342                         break;
2343                 }
2344 
2345                 case FORMAT_TYPE_PTR:
2346                         save_arg(void *);
2347                         /* skip all alphanumeric pointer suffixes */
2348                         while (isalnum(*fmt))
2349                                 fmt++;
2350                         break;
2351 
2352                 default:
2353                         switch (spec.type) {
2354 
2355                         case FORMAT_TYPE_LONG_LONG:
2356                                 save_arg(long long);
2357                                 break;
2358                         case FORMAT_TYPE_ULONG:
2359                         case FORMAT_TYPE_LONG:
2360                                 save_arg(unsigned long);
2361                                 break;
2362                         case FORMAT_TYPE_SIZE_T:
2363                                 save_arg(size_t);
2364                                 break;
2365                         case FORMAT_TYPE_PTRDIFF:
2366                                 save_arg(ptrdiff_t);
2367                                 break;
2368                         case FORMAT_TYPE_UBYTE:
2369                         case FORMAT_TYPE_BYTE:
2370                                 save_arg(char);
2371                                 break;
2372                         case FORMAT_TYPE_USHORT:
2373                         case FORMAT_TYPE_SHORT:
2374                                 save_arg(short);
2375                                 break;
2376                         default:
2377                                 save_arg(int);
2378                         }
2379                 }
2380         }
2381 
2382 out:
2383         return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
2384 #undef save_arg
2385 }
2386 EXPORT_SYMBOL_GPL(vbin_printf);
2387 
2388 /**
2389  * bstr_printf - Format a string from binary arguments and place it in a buffer
2390  * @buf: The buffer to place the result into
2391  * @size: The size of the buffer, including the trailing null space
2392  * @fmt: The format string to use
2393  * @bin_buf: Binary arguments for the format string
2394  *
2395  * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2396  * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2397  * a binary buffer that generated by vbin_printf.
2398  *
2399  * The format follows C99 vsnprintf, but has some extensions:
2400  *  see vsnprintf comment for details.
2401  *
2402  * The return value is the number of characters which would
2403  * be generated for the given input, excluding the trailing
2404  * '\0', as per ISO C99. If you want to have the exact
2405  * number of characters written into @buf as return value
2406  * (not including the trailing '\0'), use vscnprintf(). If the
2407  * return is greater than or equal to @size, the resulting
2408  * string is truncated.
2409  */
2410 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2411 {
2412         struct printf_spec spec = {0};
2413         char *str, *end;
2414         const char *args = (const char *)bin_buf;
2415 
2416         if (WARN_ON_ONCE(size > INT_MAX))
2417                 return 0;
2418 
2419         str = buf;
2420         end = buf + size;
2421 
2422 #define get_arg(type)                                                   \
2423 ({                                                                      \
2424         typeof(type) value;                                             \
2425         if (sizeof(type) == 8) {                                        \
2426                 args = PTR_ALIGN(args, sizeof(u32));                    \
2427                 *(u32 *)&value = *(u32 *)args;                          \
2428                 *((u32 *)&value + 1) = *(u32 *)(args + 4);              \
2429         } else {                                                        \
2430                 args = PTR_ALIGN(args, sizeof(type));                   \
2431                 value = *(typeof(type) *)args;                          \
2432         }                                                               \
2433         args += sizeof(type);                                           \
2434         value;                                                          \
2435 })
2436 
2437         /* Make sure end is always >= buf */
2438         if (end < buf) {
2439                 end = ((void *)-1);
2440                 size = end - buf;
2441         }
2442 
2443         while (*fmt) {
2444                 const char *old_fmt = fmt;
2445                 int read = format_decode(fmt, &spec);
2446 
2447                 fmt += read;
2448 
2449                 switch (spec.type) {
2450                 case FORMAT_TYPE_NONE: {
2451                         int copy = read;
2452                         if (str < end) {
2453                                 if (copy > end - str)
2454                                         copy = end - str;
2455                                 memcpy(str, old_fmt, copy);
2456                         }
2457                         str += read;
2458                         break;
2459                 }
2460 
2461                 case FORMAT_TYPE_WIDTH:
2462                         set_field_width(&spec, get_arg(int));
2463                         break;
2464 
2465                 case FORMAT_TYPE_PRECISION:
2466                         set_precision(&spec, get_arg(int));
2467                         break;
2468 
2469                 case FORMAT_TYPE_CHAR: {
2470                         char c;
2471 
2472                         if (!(spec.flags & LEFT)) {
2473                                 while (--spec.field_width > 0) {
2474                                         if (str < end)
2475                                                 *str = ' ';
2476                                         ++str;
2477                                 }
2478                         }
2479                         c = (unsigned char) get_arg(char);
2480                         if (str < end)
2481                                 *str = c;
2482                         ++str;
2483                         while (--spec.field_width > 0) {
2484                                 if (str < end)
2485                                         *str = ' ';
2486                                 ++str;
2487                         }
2488                         break;
2489                 }
2490 
2491                 case FORMAT_TYPE_STR: {
2492                         const char *str_arg = args;
2493                         args += strlen(str_arg) + 1;
2494                         str = string(str, end, (char *)str_arg, spec);
2495                         break;
2496                 }
2497 
2498                 case FORMAT_TYPE_PTR:
2499                         str = pointer(fmt, str, end, get_arg(void *), spec);
2500                         while (isalnum(*fmt))
2501                                 fmt++;
2502                         break;
2503 
2504                 case FORMAT_TYPE_PERCENT_CHAR:
2505                         if (str < end)
2506                                 *str = '%';
2507                         ++str;
2508                         break;
2509 
2510                 case FORMAT_TYPE_INVALID:
2511                         goto out;
2512 
2513                 default: {
2514                         unsigned long long num;
2515 
2516                         switch (spec.type) {
2517 
2518                         case FORMAT_TYPE_LONG_LONG:
2519                                 num = get_arg(long long);
2520                                 break;
2521                         case FORMAT_TYPE_ULONG:
2522                         case FORMAT_TYPE_LONG:
2523                                 num = get_arg(unsigned long);
2524                                 break;
2525                         case FORMAT_TYPE_SIZE_T:
2526                                 num = get_arg(size_t);
2527                                 break;
2528                         case FORMAT_TYPE_PTRDIFF:
2529                                 num = get_arg(ptrdiff_t);
2530                                 break;
2531                         case FORMAT_TYPE_UBYTE:
2532                                 num = get_arg(unsigned char);
2533                                 break;
2534                         case FORMAT_TYPE_BYTE:
2535                                 num = get_arg(signed char);
2536                                 break;
2537                         case FORMAT_TYPE_USHORT:
2538                                 num = get_arg(unsigned short);
2539                                 break;
2540                         case FORMAT_TYPE_SHORT:
2541                                 num = get_arg(short);
2542                                 break;
2543                         case FORMAT_TYPE_UINT:
2544                                 num = get_arg(unsigned int);
2545                                 break;
2546                         default:
2547                                 num = get_arg(int);
2548                         }
2549 
2550                         str = number(str, end, num, spec);
2551                 } /* default: */
2552                 } /* switch(spec.type) */
2553         } /* while(*fmt) */
2554 
2555 out:
2556         if (size > 0) {
2557                 if (str < end)
2558                         *str = '\0';
2559                 else
2560                         end[-1] = '\0';
2561         }
2562 
2563 #undef get_arg
2564 
2565         /* the trailing null byte doesn't count towards the total */
2566         return str - buf;
2567 }
2568 EXPORT_SYMBOL_GPL(bstr_printf);
2569 
2570 /**
2571  * bprintf - Parse a format string and place args' binary value in a buffer
2572  * @bin_buf: The buffer to place args' binary value
2573  * @size: The size of the buffer(by words(32bits), not characters)
2574  * @fmt: The format string to use
2575  * @...: Arguments for the format string
2576  *
2577  * The function returns the number of words(u32) written
2578  * into @bin_buf.
2579  */
2580 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
2581 {
2582         va_list args;
2583         int ret;
2584 
2585         va_start(args, fmt);
2586         ret = vbin_printf(bin_buf, size, fmt, args);
2587         va_end(args);
2588 
2589         return ret;
2590 }
2591 EXPORT_SYMBOL_GPL(bprintf);
2592 
2593 #endif /* CONFIG_BINARY_PRINTF */
2594 
2595 /**
2596  * vsscanf - Unformat a buffer into a list of arguments
2597  * @buf:        input buffer
2598  * @fmt:        format of buffer
2599  * @args:       arguments
2600  */
2601 int vsscanf(const char *buf, const char *fmt, va_list args)
2602 {
2603         const char *str = buf;
2604         char *next;
2605         char digit;
2606         int num = 0;
2607         u8 qualifier;
2608         unsigned int base;
2609         union {
2610                 long long s;
2611                 unsigned long long u;
2612         } val;
2613         s16 field_width;
2614         bool is_sign;
2615 
2616         while (*fmt) {
2617                 /* skip any white space in format */
2618                 /* white space in format matchs any amount of
2619                  * white space, including none, in the input.
2620                  */
2621                 if (isspace(*fmt)) {
2622                         fmt = skip_spaces(++fmt);
2623                         str = skip_spaces(str);
2624                 }
2625 
2626                 /* anything that is not a conversion must match exactly */
2627                 if (*fmt != '%' && *fmt) {
2628                         if (*fmt++ != *str++)
2629                                 break;
2630                         continue;
2631                 }
2632 
2633                 if (!*fmt)
2634                         break;
2635                 ++fmt;
2636 
2637                 /* skip this conversion.
2638                  * advance both strings to next white space
2639                  */
2640                 if (*fmt == '*') {
2641                         if (!*str)
2642                                 break;
2643                         while (!isspace(*fmt) && *fmt != '%' && *fmt) {
2644                                 /* '%*[' not yet supported, invalid format */
2645                                 if (*fmt == '[')
2646                                         return num;
2647                                 fmt++;
2648                         }
2649                         while (!isspace(*str) && *str)
2650                                 str++;
2651                         continue;
2652                 }
2653 
2654                 /* get field width */
2655                 field_width = -1;
2656                 if (isdigit(*fmt)) {
2657                         field_width = skip_atoi(&fmt);
2658                         if (field_width <= 0)
2659                                 break;
2660                 }
2661 
2662                 /* get conversion qualifier */
2663                 qualifier = -1;
2664                 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2665                     _tolower(*fmt) == 'z') {
2666                         qualifier = *fmt++;
2667                         if (unlikely(qualifier == *fmt)) {
2668                                 if (qualifier == 'h') {
2669                                         qualifier = 'H';
2670                                         fmt++;
2671                                 } else if (qualifier == 'l') {
2672                                         qualifier = 'L';
2673                                         fmt++;
2674                                 }
2675                         }
2676                 }
2677 
2678                 if (!*fmt)
2679                         break;
2680 
2681                 if (*fmt == 'n') {
2682                         /* return number of characters read so far */
2683                         *va_arg(args, int *) = str - buf;
2684                         ++fmt;
2685                         continue;
2686                 }
2687 
2688                 if (!*str)
2689                         break;
2690 
2691                 base = 10;
2692                 is_sign = false;
2693 
2694                 switch (*fmt++) {
2695                 case 'c':
2696                 {
2697                         char *s = (char *)va_arg(args, char*);
2698                         if (field_width == -1)
2699                                 field_width = 1;
2700                         do {
2701                                 *s++ = *str++;
2702                         } while (--field_width > 0 && *str);
2703                         num++;
2704                 }
2705                 continue;
2706                 case 's':
2707                 {
2708                         char *s = (char *)va_arg(args, char *);
2709                         if (field_width == -1)
2710                                 field_width = SHRT_MAX;
2711                         /* first, skip leading white space in buffer */
2712                         str = skip_spaces(str);
2713 
2714                         /* now copy until next white space */
2715                         while (*str && !isspace(*str) && field_width--)
2716                                 *s++ = *str++;
2717                         *s = '\0';
2718                         num++;
2719                 }
2720                 continue;
2721                 /*
2722                  * Warning: This implementation of the '[' conversion specifier
2723                  * deviates from its glibc counterpart in the following ways:
2724                  * (1) It does NOT support ranges i.e. '-' is NOT a special
2725                  *     character
2726                  * (2) It cannot match the closing bracket ']' itself
2727                  * (3) A field width is required
2728                  * (4) '%*[' (discard matching input) is currently not supported
2729                  *
2730                  * Example usage:
2731                  * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
2732                  *              buf1, buf2, buf3);
2733                  * if (ret < 3)
2734                  *    // etc..
2735                  */
2736                 case '[':
2737                 {
2738                         char *s = (char *)va_arg(args, char *);
2739                         DECLARE_BITMAP(set, 256) = {0};
2740                         unsigned int len = 0;
2741                         bool negate = (*fmt == '^');
2742 
2743                         /* field width is required */
2744                         if (field_width == -1)
2745                                 return num;
2746 
2747                         if (negate)
2748                                 ++fmt;
2749 
2750                         for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
2751                                 set_bit((u8)*fmt, set);
2752 
2753                         /* no ']' or no character set found */
2754                         if (!*fmt || !len)
2755                                 return num;
2756                         ++fmt;
2757 
2758                         if (negate) {
2759                                 bitmap_complement(set, set, 256);
2760                                 /* exclude null '\0' byte */
2761                                 clear_bit(0, set);
2762                         }
2763 
2764                         /* match must be non-empty */
2765                         if (!test_bit((u8)*str, set))
2766                                 return num;
2767 
2768                         while (test_bit((u8)*str, set) && field_width--)
2769                                 *s++ = *str++;
2770                         *s = '\0';
2771                         ++num;
2772                 }
2773                 continue;
2774                 case 'o':
2775                         base = 8;
2776                         break;
2777                 case 'x':
2778                 case 'X':
2779                         base = 16;
2780                         break;
2781                 case 'i':
2782                         base = 0;
2783                 case 'd':
2784                         is_sign = true;
2785                 case 'u':
2786                         break;
2787                 case '%':
2788                         /* looking for '%' in str */
2789                         if (*str++ != '%')
2790                                 return num;
2791                         continue;
2792                 default:
2793                         /* invalid format; stop here */
2794                         return num;
2795                 }
2796 
2797                 /* have some sort of integer conversion.
2798                  * first, skip white space in buffer.
2799                  */
2800                 str = skip_spaces(str);
2801 
2802                 digit = *str;
2803                 if (is_sign && digit == '-')
2804                         digit = *(str + 1);
2805 
2806                 if (!digit
2807                     || (base == 16 && !isxdigit(digit))
2808                     || (base == 10 && !isdigit(digit))
2809                     || (base == 8 && (!isdigit(digit) || digit > '7'))
2810                     || (base == 0 && !isdigit(digit)))
2811                         break;
2812 
2813                 if (is_sign)
2814                         val.s = qualifier != 'L' ?
2815                                 simple_strtol(str, &next, base) :
2816                                 simple_strtoll(str, &next, base);
2817                 else
2818                         val.u = qualifier != 'L' ?
2819                                 simple_strtoul(str, &next, base) :
2820                                 simple_strtoull(str, &next, base);
2821 
2822                 if (field_width > 0 && next - str > field_width) {
2823                         if (base == 0)
2824                                 _parse_integer_fixup_radix(str, &base);
2825                         while (next - str > field_width) {
2826                                 if (is_sign)
2827                                         val.s = div_s64(val.s, base);
2828                                 else
2829                                         val.u = div_u64(val.u, base);
2830                                 --next;
2831                         }
2832                 }
2833 
2834                 switch (qualifier) {
2835                 case 'H':       /* that's 'hh' in format */
2836                         if (is_sign)
2837                                 *va_arg(args, signed char *) = val.s;
2838                         else
2839                                 *va_arg(args, unsigned char *) = val.u;
2840                         break;
2841                 case 'h':
2842                         if (is_sign)
2843                                 *va_arg(args, short *) = val.s;
2844                         else
2845                                 *va_arg(args, unsigned short *) = val.u;
2846                         break;
2847                 case 'l':
2848                         if (is_sign)
2849                                 *va_arg(args, long *) = val.s;
2850                         else
2851                                 *va_arg(args, unsigned long *) = val.u;
2852                         break;
2853                 case 'L':
2854                         if (is_sign)
2855                                 *va_arg(args, long long *) = val.s;
2856                         else
2857                                 *va_arg(args, unsigned long long *) = val.u;
2858                         break;
2859                 case 'Z':
2860                 case 'z':
2861                         *va_arg(args, size_t *) = val.u;
2862                         break;
2863                 default:
2864                         if (is_sign)
2865                                 *va_arg(args, int *) = val.s;
2866                         else
2867                                 *va_arg(args, unsigned int *) = val.u;
2868                         break;
2869                 }
2870                 num++;
2871 
2872                 if (!next)
2873                         break;
2874                 str = next;
2875         }
2876 
2877         return num;
2878 }
2879 EXPORT_SYMBOL(vsscanf);
2880 
2881 /**
2882  * sscanf - Unformat a buffer into a list of arguments
2883  * @buf:        input buffer
2884  * @fmt:        formatting of buffer
2885  * @...:        resulting arguments
2886  */
2887 int sscanf(const char *buf, const char *fmt, ...)
2888 {
2889         va_list args;
2890         int i;
2891 
2892         va_start(args, fmt);
2893         i = vsscanf(buf, fmt, args);
2894         va_end(args);
2895 
2896         return i;
2897 }
2898 EXPORT_SYMBOL(sscanf);
2899 

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