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 54  * This function is obsolete.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 79  * This function is obsolete.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 93  * This function is obsolete.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

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