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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/module.h> /* for KSYM_SYMBOL_LEN */
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/ctype.h>
24 #include <linux/kernel.h>
25 #include <linux/kallsyms.h>
26 #include <linux/math64.h>
27 #include <linux/uaccess.h>
28 #include <linux/ioport.h>
29 #include <net/addrconf.h>
30
31 #include <asm/page.h> /* for PAGE_SIZE */
32 #include <asm/sections.h> /* for dereference_function_descriptor() */
33
34 #include "kstrtox.h"
35
36 /**
37 * simple_strtoull - convert a string to an unsigned long long
38 * @cp: The start of the string
39 * @endp: A pointer to the end of the parsed string will be placed here
40 * @base: The number base to use
41 *
42 * This function is obsolete. Please use kstrtoull instead.
43 */
44 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
45 {
46 unsigned long long result;
47 unsigned int rv;
48
49 cp = _parse_integer_fixup_radix(cp, &base);
50 rv = _parse_integer(cp, base, &result);
51 /* FIXME */
52 cp += (rv & ~KSTRTOX_OVERFLOW);
53
54 if (endp)
55 *endp = (char *)cp;
56
57 return result;
58 }
59 EXPORT_SYMBOL(simple_strtoull);
60
61 /**
62 * simple_strtoul - convert a string to an unsigned long
63 * @cp: The start of the string
64 * @endp: A pointer to the end of the parsed string will be placed here
65 * @base: The number base to use
66 *
67 * This function is obsolete. Please use kstrtoul instead.
68 */
69 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
70 {
71 return simple_strtoull(cp, endp, base);
72 }
73 EXPORT_SYMBOL(simple_strtoul);
74
75 /**
76 * simple_strtol - convert a string to a signed long
77 * @cp: The start of the string
78 * @endp: A pointer to the end of the parsed string will be placed here
79 * @base: The number base to use
80 *
81 * This function is obsolete. Please use kstrtol instead.
82 */
83 long simple_strtol(const char *cp, char **endp, unsigned int base)
84 {
85 if (*cp == '-')
86 return -simple_strtoul(cp + 1, endp, base);
87
88 return simple_strtoul(cp, endp, base);
89 }
90 EXPORT_SYMBOL(simple_strtol);
91
92 /**
93 * simple_strtoll - convert a string to a signed long long
94 * @cp: The start of the string
95 * @endp: A pointer to the end of the parsed string will be placed here
96 * @base: The number base to use
97 *
98 * This function is obsolete. Please use kstrtoll instead.
99 */
100 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
101 {
102 if (*cp == '-')
103 return -simple_strtoull(cp + 1, endp, base);
104
105 return simple_strtoull(cp, endp, base);
106 }
107 EXPORT_SYMBOL(simple_strtoll);
108
109 static noinline_for_stack
110 int skip_atoi(const char **s)
111 {
112 int i = 0;
113
114 while (isdigit(**s))
115 i = i*10 + *((*s)++) - '0';
116
117 return i;
118 }
119
120 /* Decimal conversion is by far the most typical, and is used
121 * for /proc and /sys data. This directly impacts e.g. top performance
122 * with many processes running. We optimize it for speed
123 * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
124 * (with permission from the author, Douglas W. Jones).
125 */
126
127 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
128 /* Formats correctly any integer in [0, 999999999] */
129 static noinline_for_stack
130 char *put_dec_full9(char *buf, unsigned q)
131 {
132 unsigned r;
133
134 /*
135 * Possible ways to approx. divide by 10
136 * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit)
137 * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul)
138 * (x * 0x6667) >> 18 x < 43699
139 * (x * 0x3334) >> 17 x < 16389
140 * (x * 0x199a) >> 16 x < 16389
141 * (x * 0x0ccd) >> 15 x < 16389
142 * (x * 0x0667) >> 14 x < 2739
143 * (x * 0x0334) >> 13 x < 1029
144 * (x * 0x019a) >> 12 x < 1029
145 * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386)
146 * (x * 0x0067) >> 10 x < 179
147 * (x * 0x0034) >> 9 x < 69 same
148 * (x * 0x001a) >> 8 x < 69 same
149 * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386)
150 * (x * 0x0007) >> 6 x < 19
151 * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
152 */
153 r = (q * (uint64_t)0x1999999a) >> 32;
154 *buf++ = (q - 10 * r) + '0'; /* 1 */
155 q = (r * (uint64_t)0x1999999a) >> 32;
156 *buf++ = (r - 10 * q) + '0'; /* 2 */
157 r = (q * (uint64_t)0x1999999a) >> 32;
158 *buf++ = (q - 10 * r) + '0'; /* 3 */
159 q = (r * (uint64_t)0x1999999a) >> 32;
160 *buf++ = (r - 10 * q) + '0'; /* 4 */
161 r = (q * (uint64_t)0x1999999a) >> 32;
162 *buf++ = (q - 10 * r) + '0'; /* 5 */
163 /* Now value is under 10000, can avoid 64-bit multiply */
164 q = (r * 0x199a) >> 16;
165 *buf++ = (r - 10 * q) + '0'; /* 6 */
166 r = (q * 0xcd) >> 11;
167 *buf++ = (q - 10 * r) + '0'; /* 7 */
168 q = (r * 0xcd) >> 11;
169 *buf++ = (r - 10 * q) + '0'; /* 8 */
170 *buf++ = q + '0'; /* 9 */
171 return buf;
172 }
173 #endif
174
175 /* Similar to above but do not pad with zeros.
176 * Code can be easily arranged to print 9 digits too, but our callers
177 * always call put_dec_full9() instead when the number has 9 decimal digits.
178 */
179 static noinline_for_stack
180 char *put_dec_trunc8(char *buf, unsigned r)
181 {
182 unsigned q;
183
184 /* Copy of previous function's body with added early returns */
185 while (r >= 10000) {
186 q = r + '0';
187 r = (r * (uint64_t)0x1999999a) >> 32;
188 *buf++ = q - 10*r;
189 }
190
191 q = (r * 0x199a) >> 16; /* r <= 9999 */
192 *buf++ = (r - 10 * q) + '0';
193 if (q == 0)
194 return buf;
195 r = (q * 0xcd) >> 11; /* q <= 999 */
196 *buf++ = (q - 10 * r) + '0';
197 if (r == 0)
198 return buf;
199 q = (r * 0xcd) >> 11; /* r <= 99 */
200 *buf++ = (r - 10 * q) + '0';
201 if (q == 0)
202 return buf;
203 *buf++ = q + '0'; /* q <= 9 */
204 return buf;
205 }
206
207 /* There are two algorithms to print larger numbers.
208 * One is generic: divide by 1000000000 and repeatedly print
209 * groups of (up to) 9 digits. It's conceptually simple,
210 * but requires a (unsigned long long) / 1000000000 division.
211 *
212 * Second algorithm splits 64-bit unsigned long long into 16-bit chunks,
213 * manipulates them cleverly and generates groups of 4 decimal digits.
214 * It so happens that it does NOT require long long division.
215 *
216 * If long is > 32 bits, division of 64-bit values is relatively easy,
217 * and we will use the first algorithm.
218 * If long long is > 64 bits (strange architecture with VERY large long long),
219 * second algorithm can't be used, and we again use the first one.
220 *
221 * Else (if long is 32 bits and long long is 64 bits) we use second one.
222 */
223
224 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
225
226 /* First algorithm: generic */
227
228 static
229 char *put_dec(char *buf, unsigned long long n)
230 {
231 if (n >= 100*1000*1000) {
232 while (n >= 1000*1000*1000)
233 buf = put_dec_full9(buf, do_div(n, 1000*1000*1000));
234 if (n >= 100*1000*1000)
235 return put_dec_full9(buf, n);
236 }
237 return put_dec_trunc8(buf, n);
238 }
239
240 #else
241
242 /* Second algorithm: valid only for 64-bit long longs */
243
244 /* See comment in put_dec_full9 for choice of constants */
245 static noinline_for_stack
246 void put_dec_full4(char *buf, unsigned q)
247 {
248 unsigned r;
249 r = (q * 0xccd) >> 15;
250 buf[0] = (q - 10 * r) + '0';
251 q = (r * 0xcd) >> 11;
252 buf[1] = (r - 10 * q) + '0';
253 r = (q * 0xcd) >> 11;
254 buf[2] = (q - 10 * r) + '0';
255 buf[3] = r + '0';
256 }
257
258 /*
259 * Call put_dec_full4 on x % 10000, return x / 10000.
260 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
261 * holds for all x < 1,128,869,999. The largest value this
262 * helper will ever be asked to convert is 1,125,520,955.
263 * (d1 in the put_dec code, assuming n is all-ones).
264 */
265 static
266 unsigned put_dec_helper4(char *buf, unsigned x)
267 {
268 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
269
270 put_dec_full4(buf, x - q * 10000);
271 return q;
272 }
273
274 /* Based on code by Douglas W. Jones found at
275 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
276 * (with permission from the author).
277 * Performs no 64-bit division and hence should be fast on 32-bit machines.
278 */
279 static
280 char *put_dec(char *buf, unsigned long long n)
281 {
282 uint32_t d3, d2, d1, q, h;
283
284 if (n < 100*1000*1000)
285 return put_dec_trunc8(buf, n);
286
287 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
288 h = (n >> 32);
289 d2 = (h ) & 0xffff;
290 d3 = (h >> 16); /* implicit "& 0xffff" */
291
292 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
293 q = put_dec_helper4(buf, q);
294
295 q += 7671 * d3 + 9496 * d2 + 6 * d1;
296 q = put_dec_helper4(buf+4, q);
297
298 q += 4749 * d3 + 42 * d2;
299 q = put_dec_helper4(buf+8, q);
300
301 q += 281 * d3;
302 buf += 12;
303 if (q)
304 buf = put_dec_trunc8(buf, q);
305 else while (buf[-1] == '0')
306 --buf;
307
308 return buf;
309 }
310
311 #endif
312
313 /*
314 * Convert passed number to decimal string.
315 * Returns the length of string. On buffer overflow, returns 0.
316 *
317 * If speed is not important, use snprintf(). It's easy to read the code.
318 */
319 int num_to_str(char *buf, int size, unsigned long long num)
320 {
321 char tmp[sizeof(num) * 3];
322 int idx, len;
323
324 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
325 if (num <= 9) {
326 tmp[0] = '0' + num;
327 len = 1;
328 } else {
329 len = put_dec(tmp, num) - tmp;
330 }
331
332 if (len > size)
333 return 0;
334 for (idx = 0; idx < len; ++idx)
335 buf[idx] = tmp[len - idx - 1];
336 return len;
337 }
338
339 #define ZEROPAD 1 /* pad with zero */
340 #define SIGN 2 /* unsigned/signed long */
341 #define PLUS 4 /* show plus */
342 #define SPACE 8 /* space if plus */
343 #define LEFT 16 /* left justified */
344 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
345 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
346
347 enum format_type {
348 FORMAT_TYPE_NONE, /* Just a string part */
349 FORMAT_TYPE_WIDTH,
350 FORMAT_TYPE_PRECISION,
351 FORMAT_TYPE_CHAR,
352 FORMAT_TYPE_STR,
353 FORMAT_TYPE_PTR,
354 FORMAT_TYPE_PERCENT_CHAR,
355 FORMAT_TYPE_INVALID,
356 FORMAT_TYPE_LONG_LONG,
357 FORMAT_TYPE_ULONG,
358 FORMAT_TYPE_LONG,
359 FORMAT_TYPE_UBYTE,
360 FORMAT_TYPE_BYTE,
361 FORMAT_TYPE_USHORT,
362 FORMAT_TYPE_SHORT,
363 FORMAT_TYPE_UINT,
364 FORMAT_TYPE_INT,
365 FORMAT_TYPE_NRCHARS,
366 FORMAT_TYPE_SIZE_T,
367 FORMAT_TYPE_PTRDIFF
368 };
369
370 struct printf_spec {
371 u8 type; /* format_type enum */
372 u8 flags; /* flags to number() */
373 u8 base; /* number base, 8, 10 or 16 only */
374 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
375 s16 field_width; /* width of output field */
376 s16 precision; /* # of digits/chars */
377 };
378
379 static noinline_for_stack
380 char *number(char *buf, char *end, unsigned long long num,
381 struct printf_spec spec)
382 {
383 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
384 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
385
386 char tmp[66];
387 char sign;
388 char locase;
389 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
390 int i;
391 bool is_zero = num == 0LL;
392
393 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
394 * produces same digits or (maybe lowercased) letters */
395 locase = (spec.flags & SMALL);
396 if (spec.flags & LEFT)
397 spec.flags &= ~ZEROPAD;
398 sign = 0;
399 if (spec.flags & SIGN) {
400 if ((signed long long)num < 0) {
401 sign = '-';
402 num = -(signed long long)num;
403 spec.field_width--;
404 } else if (spec.flags & PLUS) {
405 sign = '+';
406 spec.field_width--;
407 } else if (spec.flags & SPACE) {
408 sign = ' ';
409 spec.field_width--;
410 }
411 }
412 if (need_pfx) {
413 if (spec.base == 16)
414 spec.field_width -= 2;
415 else if (!is_zero)
416 spec.field_width--;
417 }
418
419 /* generate full string in tmp[], in reverse order */
420 i = 0;
421 if (num < spec.base)
422 tmp[i++] = digits[num] | locase;
423 /* Generic code, for any base:
424 else do {
425 tmp[i++] = (digits[do_div(num,base)] | locase);
426 } while (num != 0);
427 */
428 else if (spec.base != 10) { /* 8 or 16 */
429 int mask = spec.base - 1;
430 int shift = 3;
431
432 if (spec.base == 16)
433 shift = 4;
434 do {
435 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
436 num >>= shift;
437 } while (num);
438 } else { /* base 10 */
439 i = put_dec(tmp, num) - tmp;
440 }
441
442 /* printing 100 using %2d gives "100", not "00" */
443 if (i > spec.precision)
444 spec.precision = i;
445 /* leading space padding */
446 spec.field_width -= spec.precision;
447 if (!(spec.flags & (ZEROPAD+LEFT))) {
448 while (--spec.field_width >= 0) {
449 if (buf < end)
450 *buf = ' ';
451 ++buf;
452 }
453 }
454 /* sign */
455 if (sign) {
456 if (buf < end)
457 *buf = sign;
458 ++buf;
459 }
460 /* "0x" / "0" prefix */
461 if (need_pfx) {
462 if (spec.base == 16 || !is_zero) {
463 if (buf < end)
464 *buf = '0';
465 ++buf;
466 }
467 if (spec.base == 16) {
468 if (buf < end)
469 *buf = ('X' | locase);
470 ++buf;
471 }
472 }
473 /* zero or space padding */
474 if (!(spec.flags & LEFT)) {
475 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
476 while (--spec.field_width >= 0) {
477 if (buf < end)
478 *buf = c;
479 ++buf;
480 }
481 }
482 /* hmm even more zero padding? */
483 while (i <= --spec.precision) {
484 if (buf < end)
485 *buf = '0';
486 ++buf;
487 }
488 /* actual digits of result */
489 while (--i >= 0) {
490 if (buf < end)
491 *buf = tmp[i];
492 ++buf;
493 }
494 /* trailing space padding */
495 while (--spec.field_width >= 0) {
496 if (buf < end)
497 *buf = ' ';
498 ++buf;
499 }
500
501 return buf;
502 }
503
504 static noinline_for_stack
505 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
506 {
507 int len, i;
508
509 if ((unsigned long)s < PAGE_SIZE)
510 s = "(null)";
511
512 len = strnlen(s, spec.precision);
513
514 if (!(spec.flags & LEFT)) {
515 while (len < spec.field_width--) {
516 if (buf < end)
517 *buf = ' ';
518 ++buf;
519 }
520 }
521 for (i = 0; i < len; ++i) {
522 if (buf < end)
523 *buf = *s;
524 ++buf; ++s;
525 }
526 while (len < spec.field_width--) {
527 if (buf < end)
528 *buf = ' ';
529 ++buf;
530 }
531
532 return buf;
533 }
534
535 static noinline_for_stack
536 char *symbol_string(char *buf, char *end, void *ptr,
537 struct printf_spec spec, char ext)
538 {
539 unsigned long value = (unsigned long) ptr;
540 #ifdef CONFIG_KALLSYMS
541 char sym[KSYM_SYMBOL_LEN];
542 if (ext == 'B')
543 sprint_backtrace(sym, value);
544 else if (ext != 'f' && ext != 's')
545 sprint_symbol(sym, value);
546 else
547 sprint_symbol_no_offset(sym, value);
548
549 return string(buf, end, sym, spec);
550 #else
551 spec.field_width = 2 * sizeof(void *);
552 spec.flags |= SPECIAL | SMALL | ZEROPAD;
553 spec.base = 16;
554
555 return number(buf, end, value, spec);
556 #endif
557 }
558
559 static noinline_for_stack
560 char *resource_string(char *buf, char *end, struct resource *res,
561 struct printf_spec spec, const char *fmt)
562 {
563 #ifndef IO_RSRC_PRINTK_SIZE
564 #define IO_RSRC_PRINTK_SIZE 6
565 #endif
566
567 #ifndef MEM_RSRC_PRINTK_SIZE
568 #define MEM_RSRC_PRINTK_SIZE 10
569 #endif
570 static const struct printf_spec io_spec = {
571 .base = 16,
572 .field_width = IO_RSRC_PRINTK_SIZE,
573 .precision = -1,
574 .flags = SPECIAL | SMALL | ZEROPAD,
575 };
576 static const struct printf_spec mem_spec = {
577 .base = 16,
578 .field_width = MEM_RSRC_PRINTK_SIZE,
579 .precision = -1,
580 .flags = SPECIAL | SMALL | ZEROPAD,
581 };
582 static const struct printf_spec bus_spec = {
583 .base = 16,
584 .field_width = 2,
585 .precision = -1,
586 .flags = SMALL | ZEROPAD,
587 };
588 static const struct printf_spec dec_spec = {
589 .base = 10,
590 .precision = -1,
591 .flags = 0,
592 };
593 static const struct printf_spec str_spec = {
594 .field_width = -1,
595 .precision = 10,
596 .flags = LEFT,
597 };
598 static const struct printf_spec flag_spec = {
599 .base = 16,
600 .precision = -1,
601 .flags = SPECIAL | SMALL,
602 };
603
604 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
605 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
606 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
607 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
608 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
609 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
610 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
611 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
612
613 char *p = sym, *pend = sym + sizeof(sym);
614 int decode = (fmt[0] == 'R') ? 1 : 0;
615 const struct printf_spec *specp;
616
617 *p++ = '[';
618 if (res->flags & IORESOURCE_IO) {
619 p = string(p, pend, "io ", str_spec);
620 specp = &io_spec;
621 } else if (res->flags & IORESOURCE_MEM) {
622 p = string(p, pend, "mem ", str_spec);
623 specp = &mem_spec;
624 } else if (res->flags & IORESOURCE_IRQ) {
625 p = string(p, pend, "irq ", str_spec);
626 specp = &dec_spec;
627 } else if (res->flags & IORESOURCE_DMA) {
628 p = string(p, pend, "dma ", str_spec);
629 specp = &dec_spec;
630 } else if (res->flags & IORESOURCE_BUS) {
631 p = string(p, pend, "bus ", str_spec);
632 specp = &bus_spec;
633 } else {
634 p = string(p, pend, "??? ", str_spec);
635 specp = &mem_spec;
636 decode = 0;
637 }
638 p = number(p, pend, res->start, *specp);
639 if (res->start != res->end) {
640 *p++ = '-';
641 p = number(p, pend, res->end, *specp);
642 }
643 if (decode) {
644 if (res->flags & IORESOURCE_MEM_64)
645 p = string(p, pend, " 64bit", str_spec);
646 if (res->flags & IORESOURCE_PREFETCH)
647 p = string(p, pend, " pref", str_spec);
648 if (res->flags & IORESOURCE_WINDOW)
649 p = string(p, pend, " window", str_spec);
650 if (res->flags & IORESOURCE_DISABLED)
651 p = string(p, pend, " disabled", str_spec);
652 } else {
653 p = string(p, pend, " flags ", str_spec);
654 p = number(p, pend, res->flags, flag_spec);
655 }
656 *p++ = ']';
657 *p = '\0';
658
659 return string(buf, end, sym, spec);
660 }
661
662 static noinline_for_stack
663 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
664 const char *fmt)
665 {
666 int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains
667 negative value, fallback to the default */
668 char separator;
669
670 if (spec.field_width == 0)
671 /* nothing to print */
672 return buf;
673
674 if (ZERO_OR_NULL_PTR(addr))
675 /* NULL pointer */
676 return string(buf, end, NULL, spec);
677
678 switch (fmt[1]) {
679 case 'C':
680 separator = ':';
681 break;
682 case 'D':
683 separator = '-';
684 break;
685 case 'N':
686 separator = 0;
687 break;
688 default:
689 separator = ' ';
690 break;
691 }
692
693 if (spec.field_width > 0)
694 len = min_t(int, spec.field_width, 64);
695
696 for (i = 0; i < len && buf < end - 1; i++) {
697 buf = hex_byte_pack(buf, addr[i]);
698
699 if (buf < end && separator && i != len - 1)
700 *buf++ = separator;
701 }
702
703 return buf;
704 }
705
706 static noinline_for_stack
707 char *mac_address_string(char *buf, char *end, u8 *addr,
708 struct printf_spec spec, const char *fmt)
709 {
710 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
711 char *p = mac_addr;
712 int i;
713 char separator;
714 bool reversed = false;
715
716 switch (fmt[1]) {
717 case 'F':
718 separator = '-';
719 break;
720
721 case 'R':
722 reversed = true;
723 /* fall through */
724
725 default:
726 separator = ':';
727 break;
728 }
729
730 for (i = 0; i < 6; i++) {
731 if (reversed)
732 p = hex_byte_pack(p, addr[5 - i]);
733 else
734 p = hex_byte_pack(p, addr[i]);
735
736 if (fmt[0] == 'M' && i != 5)
737 *p++ = separator;
738 }
739 *p = '\0';
740
741 return string(buf, end, mac_addr, spec);
742 }
743
744 static noinline_for_stack
745 char *ip4_string(char *p, const u8 *addr, const char *fmt)
746 {
747 int i;
748 bool leading_zeros = (fmt[0] == 'i');
749 int index;
750 int step;
751
752 switch (fmt[2]) {
753 case 'h':
754 #ifdef __BIG_ENDIAN
755 index = 0;
756 step = 1;
757 #else
758 index = 3;
759 step = -1;
760 #endif
761 break;
762 case 'l':
763 index = 3;
764 step = -1;
765 break;
766 case 'n':
767 case 'b':
768 default:
769 index = 0;
770 step = 1;
771 break;
772 }
773 for (i = 0; i < 4; i++) {
774 char temp[3]; /* hold each IP quad in reverse order */
775 int digits = put_dec_trunc8(temp, addr[index]) - temp;
776 if (leading_zeros) {
777 if (digits < 3)
778 *p++ = '0';
779 if (digits < 2)
780 *p++ = '0';
781 }
782 /* reverse the digits in the quad */
783 while (digits--)
784 *p++ = temp[digits];
785 if (i < 3)
786 *p++ = '.';
787 index += step;
788 }
789 *p = '\0';
790
791 return p;
792 }
793
794 static noinline_for_stack
795 char *ip6_compressed_string(char *p, const char *addr)
796 {
797 int i, j, range;
798 unsigned char zerolength[8];
799 int longest = 1;
800 int colonpos = -1;
801 u16 word;
802 u8 hi, lo;
803 bool needcolon = false;
804 bool useIPv4;
805 struct in6_addr in6;
806
807 memcpy(&in6, addr, sizeof(struct in6_addr));
808
809 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
810
811 memset(zerolength, 0, sizeof(zerolength));
812
813 if (useIPv4)
814 range = 6;
815 else
816 range = 8;
817
818 /* find position of longest 0 run */
819 for (i = 0; i < range; i++) {
820 for (j = i; j < range; j++) {
821 if (in6.s6_addr16[j] != 0)
822 break;
823 zerolength[i]++;
824 }
825 }
826 for (i = 0; i < range; i++) {
827 if (zerolength[i] > longest) {
828 longest = zerolength[i];
829 colonpos = i;
830 }
831 }
832 if (longest == 1) /* don't compress a single 0 */
833 colonpos = -1;
834
835 /* emit address */
836 for (i = 0; i < range; i++) {
837 if (i == colonpos) {
838 if (needcolon || i == 0)
839 *p++ = ':';
840 *p++ = ':';
841 needcolon = false;
842 i += longest - 1;
843 continue;
844 }
845 if (needcolon) {
846 *p++ = ':';
847 needcolon = false;
848 }
849 /* hex u16 without leading 0s */
850 word = ntohs(in6.s6_addr16[i]);
851 hi = word >> 8;
852 lo = word & 0xff;
853 if (hi) {
854 if (hi > 0x0f)
855 p = hex_byte_pack(p, hi);
856 else
857 *p++ = hex_asc_lo(hi);
858 p = hex_byte_pack(p, lo);
859 }
860 else if (lo > 0x0f)
861 p = hex_byte_pack(p, lo);
862 else
863 *p++ = hex_asc_lo(lo);
864 needcolon = true;
865 }
866
867 if (useIPv4) {
868 if (needcolon)
869 *p++ = ':';
870 p = ip4_string(p, &in6.s6_addr[12], "I4");
871 }
872 *p = '\0';
873
874 return p;
875 }
876
877 static noinline_for_stack
878 char *ip6_string(char *p, const char *addr, const char *fmt)
879 {
880 int i;
881
882 for (i = 0; i < 8; i++) {
883 p = hex_byte_pack(p, *addr++);
884 p = hex_byte_pack(p, *addr++);
885 if (fmt[0] == 'I' && i != 7)
886 *p++ = ':';
887 }
888 *p = '\0';
889
890 return p;
891 }
892
893 static noinline_for_stack
894 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
895 struct printf_spec spec, const char *fmt)
896 {
897 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
898
899 if (fmt[0] == 'I' && fmt[2] == 'c')
900 ip6_compressed_string(ip6_addr, addr);
901 else
902 ip6_string(ip6_addr, addr, fmt);
903
904 return string(buf, end, ip6_addr, spec);
905 }
906
907 static noinline_for_stack
908 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
909 struct printf_spec spec, const char *fmt)
910 {
911 char ip4_addr[sizeof("255.255.255.255")];
912
913 ip4_string(ip4_addr, addr, fmt);
914
915 return string(buf, end, ip4_addr, spec);
916 }
917
918 static noinline_for_stack
919 char *uuid_string(char *buf, char *end, const u8 *addr,
920 struct printf_spec spec, const char *fmt)
921 {
922 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
923 char *p = uuid;
924 int i;
925 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
926 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
927 const u8 *index = be;
928 bool uc = false;
929
930 switch (*(++fmt)) {
931 case 'L':
932 uc = true; /* fall-through */
933 case 'l':
934 index = le;
935 break;
936 case 'B':
937 uc = true;
938 break;
939 }
940
941 for (i = 0; i < 16; i++) {
942 p = hex_byte_pack(p, addr[index[i]]);
943 switch (i) {
944 case 3:
945 case 5:
946 case 7:
947 case 9:
948 *p++ = '-';
949 break;
950 }
951 }
952
953 *p = 0;
954
955 if (uc) {
956 p = uuid;
957 do {
958 *p = toupper(*p);
959 } while (*(++p));
960 }
961
962 return string(buf, end, uuid, spec);
963 }
964
965 static
966 char *netdev_feature_string(char *buf, char *end, const u8 *addr,
967 struct printf_spec spec)
968 {
969 spec.flags |= SPECIAL | SMALL | ZEROPAD;
970 if (spec.field_width == -1)
971 spec.field_width = 2 + 2 * sizeof(netdev_features_t);
972 spec.base = 16;
973
974 return number(buf, end, *(const netdev_features_t *)addr, spec);
975 }
976
977 int kptr_restrict __read_mostly;
978
979 /*
980 * Show a '%p' thing. A kernel extension is that the '%p' is followed
981 * by an extra set of alphanumeric characters that are extended format
982 * specifiers.
983 *
984 * Right now we handle:
985 *
986 * - 'F' For symbolic function descriptor pointers with offset
987 * - 'f' For simple symbolic function names without offset
988 * - 'S' For symbolic direct pointers with offset
989 * - 's' For symbolic direct pointers without offset
990 * - 'B' For backtraced symbolic direct pointers with offset
991 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
992 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
993 * - 'M' For a 6-byte MAC address, it prints the address in the
994 * usual colon-separated hex notation
995 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
996 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
997 * with a dash-separated hex notation
998 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
999 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1000 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1001 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1002 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1003 * IPv6 omits the colons (01020304...0f)
1004 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1005 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
1006 * - 'I6c' for IPv6 addresses printed as specified by
1007 * http://tools.ietf.org/html/rfc5952
1008 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1009 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1010 * Options for %pU are:
1011 * b big endian lower case hex (default)
1012 * B big endian UPPER case hex
1013 * l little endian lower case hex
1014 * L little endian UPPER case hex
1015 * big endian output byte order is:
1016 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1017 * little endian output byte order is:
1018 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1019 * - 'V' For a struct va_format which contains a format string * and va_list *,
1020 * call vsnprintf(->format, *->va_list).
1021 * Implements a "recursive vsnprintf".
1022 * Do not use this feature without some mechanism to verify the
1023 * correctness of the format string and va_list arguments.
1024 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1025 * - 'NF' For a netdev_features_t
1026 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1027 * a certain separator (' ' by default):
1028 * C colon
1029 * D dash
1030 * N no separator
1031 * The maximum supported length is 64 bytes of the input. Consider
1032 * to use print_hex_dump() for the larger input.
1033 * - 'a' For a phys_addr_t type and its derivative types (passed by reference)
1034 *
1035 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1036 * function pointers are really function descriptors, which contain a
1037 * pointer to the real address.
1038 */
1039 static noinline_for_stack
1040 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
1041 struct printf_spec spec)
1042 {
1043 int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
1044
1045 if (!ptr && *fmt != 'K') {
1046 /*
1047 * Print (null) with the same width as a pointer so it makes
1048 * tabular output look nice.
1049 */
1050 if (spec.field_width == -1)
1051 spec.field_width = default_width;
1052 return string(buf, end, "(null)", spec);
1053 }
1054
1055 switch (*fmt) {
1056 case 'F':
1057 case 'f':
1058 ptr = dereference_function_descriptor(ptr);
1059 /* Fallthrough */
1060 case 'S':
1061 case 's':
1062 case 'B':
1063 return symbol_string(buf, end, ptr, spec, *fmt);
1064 case 'R':
1065 case 'r':
1066 return resource_string(buf, end, ptr, spec, fmt);
1067 case 'h':
1068 return hex_string(buf, end, ptr, spec, fmt);
1069 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1070 case 'm': /* Contiguous: 000102030405 */
1071 /* [mM]F (FDDI) */
1072 /* [mM]R (Reverse order; Bluetooth) */
1073 return mac_address_string(buf, end, ptr, spec, fmt);
1074 case 'I': /* Formatted IP supported
1075 * 4: 1.2.3.4
1076 * 6: 0001:0203:...:0708
1077 * 6c: 1::708 or 1::1.2.3.4
1078 */
1079 case 'i': /* Contiguous:
1080 * 4: 001.002.003.004
1081 * 6: 000102...0f
1082 */
1083 switch (fmt[1]) {
1084 case '6':
1085 return ip6_addr_string(buf, end, ptr, spec, fmt);
1086 case '4':
1087 return ip4_addr_string(buf, end, ptr, spec, fmt);
1088 }
1089 break;
1090 case 'U':
1091 return uuid_string(buf, end, ptr, spec, fmt);
1092 case 'V':
1093 {
1094 va_list va;
1095
1096 va_copy(va, *((struct va_format *)ptr)->va);
1097 buf += vsnprintf(buf, end > buf ? end - buf : 0,
1098 ((struct va_format *)ptr)->fmt, va);
1099 va_end(va);
1100 return buf;
1101 }
1102 case 'K':
1103 /*
1104 * %pK cannot be used in IRQ context because its test
1105 * for CAP_SYSLOG would be meaningless.
1106 */
1107 if (kptr_restrict && (in_irq() || in_serving_softirq() ||
1108 in_nmi())) {
1109 if (spec.field_width == -1)
1110 spec.field_width = default_width;
1111 return string(buf, end, "pK-error", spec);
1112 }
1113 if (!((kptr_restrict == 0) ||
1114 (kptr_restrict == 1 &&
1115 has_capability_noaudit(current, CAP_SYSLOG))))
1116 ptr = NULL;
1117 break;
1118 case 'N':
1119 switch (fmt[1]) {
1120 case 'F':
1121 return netdev_feature_string(buf, end, ptr, spec);
1122 }
1123 break;
1124 case 'a':
1125 spec.flags |= SPECIAL | SMALL | ZEROPAD;
1126 spec.field_width = sizeof(phys_addr_t) * 2 + 2;
1127 spec.base = 16;
1128 return number(buf, end,
1129 (unsigned long long) *((phys_addr_t *)ptr), spec);
1130 }
1131 spec.flags |= SMALL;
1132 if (spec.field_width == -1) {
1133 spec.field_width = default_width;
1134 spec.flags |= ZEROPAD;
1135 }
1136 spec.base = 16;
1137
1138 return number(buf, end, (unsigned long) ptr, spec);
1139 }
1140
1141 /*
1142 * Helper function to decode printf style format.
1143 * Each call decode a token from the format and return the
1144 * number of characters read (or likely the delta where it wants
1145 * to go on the next call).
1146 * The decoded token is returned through the parameters
1147 *
1148 * 'h', 'l', or 'L' for integer fields
1149 * 'z' support added 23/7/1999 S.H.
1150 * 'z' changed to 'Z' --davidm 1/25/99
1151 * 't' added for ptrdiff_t
1152 *
1153 * @fmt: the format string
1154 * @type of the token returned
1155 * @flags: various flags such as +, -, # tokens..
1156 * @field_width: overwritten width
1157 * @base: base of the number (octal, hex, ...)
1158 * @precision: precision of a number
1159 * @qualifier: qualifier of a number (long, size_t, ...)
1160 */
1161 static noinline_for_stack
1162 int format_decode(const char *fmt, struct printf_spec *spec)
1163 {
1164 const char *start = fmt;
1165
1166 /* we finished early by reading the field width */
1167 if (spec->type == FORMAT_TYPE_WIDTH) {
1168 if (spec->field_width < 0) {
1169 spec->field_width = -spec->field_width;
1170 spec->flags |= LEFT;
1171 }
1172 spec->type = FORMAT_TYPE_NONE;
1173 goto precision;
1174 }
1175
1176 /* we finished early by reading the precision */
1177 if (spec->type == FORMAT_TYPE_PRECISION) {
1178 if (spec->precision < 0)
1179 spec->precision = 0;
1180
1181 spec->type = FORMAT_TYPE_NONE;
1182 goto qualifier;
1183 }
1184
1185 /* By default */
1186 spec->type = FORMAT_TYPE_NONE;
1187
1188 for (; *fmt ; ++fmt) {
1189 if (*fmt == '%')
1190 break;
1191 }
1192
1193 /* Return the current non-format string */
1194 if (fmt != start || !*fmt)
1195 return fmt - start;
1196
1197 /* Process flags */
1198 spec->flags = 0;
1199
1200 while (1) { /* this also skips first '%' */
1201 bool found = true;
1202
1203 ++fmt;
1204
1205 switch (*fmt) {
1206 case '-': spec->flags |= LEFT; break;
1207 case '+': spec->flags |= PLUS; break;
1208 case ' ': spec->flags |= SPACE; break;
1209 case '#': spec->flags |= SPECIAL; break;
1210 case '0': spec->flags |= ZEROPAD; break;
1211 default: found = false;
1212 }
1213
1214 if (!found)
1215 break;
1216 }
1217
1218 /* get field width */
1219 spec->field_width = -1;
1220
1221 if (isdigit(*fmt))
1222 spec->field_width = skip_atoi(&fmt);
1223 else if (*fmt == '*') {
1224 /* it's the next argument */
1225 spec->type = FORMAT_TYPE_WIDTH;
1226 return ++fmt - start;
1227 }
1228
1229 precision:
1230 /* get the precision */
1231 spec->precision = -1;
1232 if (*fmt == '.') {
1233 ++fmt;
1234 if (isdigit(*fmt)) {
1235 spec->precision = skip_atoi(&fmt);
1236 if (spec->precision < 0)
1237 spec->precision = 0;
1238 } else if (*fmt == '*') {
1239 /* it's the next argument */
1240 spec->type = FORMAT_TYPE_PRECISION;
1241 return ++fmt - start;
1242 }
1243 }
1244
1245 qualifier:
1246 /* get the conversion qualifier */
1247 spec->qualifier = -1;
1248 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1249 _tolower(*fmt) == 'z' || *fmt == 't') {
1250 spec->qualifier = *fmt++;
1251 if (unlikely(spec->qualifier == *fmt)) {
1252 if (spec->qualifier == 'l') {
1253 spec->qualifier = 'L';
1254 ++fmt;
1255 } else if (spec->qualifier == 'h') {
1256 spec->qualifier = 'H';
1257 ++fmt;
1258 }
1259 }
1260 }
1261
1262 /* default base */
1263 spec->base = 10;
1264 switch (*fmt) {
1265 case 'c':
1266 spec->type = FORMAT_TYPE_CHAR;
1267 return ++fmt - start;
1268
1269 case 's':
1270 spec->type = FORMAT_TYPE_STR;
1271 return ++fmt - start;
1272
1273 case 'p':
1274 spec->type = FORMAT_TYPE_PTR;
1275 return fmt - start;
1276 /* skip alnum */
1277
1278 case 'n':
1279 spec->type = FORMAT_TYPE_NRCHARS;
1280 return ++fmt - start;
1281
1282 case '%':
1283 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1284 return ++fmt - start;
1285
1286 /* integer number formats - set up the flags and "break" */
1287 case 'o':
1288 spec->base = 8;
1289 break;
1290
1291 case 'x':
1292 spec->flags |= SMALL;
1293
1294 case 'X':
1295 spec->base = 16;
1296 break;
1297
1298 case 'd':
1299 case 'i':
1300 spec->flags |= SIGN;
1301 case 'u':
1302 break;
1303
1304 default:
1305 spec->type = FORMAT_TYPE_INVALID;
1306 return fmt - start;
1307 }
1308
1309 if (spec->qualifier == 'L')
1310 spec->type = FORMAT_TYPE_LONG_LONG;
1311 else if (spec->qualifier == 'l') {
1312 if (spec->flags & SIGN)
1313 spec->type = FORMAT_TYPE_LONG;
1314 else
1315 spec->type = FORMAT_TYPE_ULONG;
1316 } else if (_tolower(spec->qualifier) == 'z') {
1317 spec->type = FORMAT_TYPE_SIZE_T;
1318 } else if (spec->qualifier == 't') {
1319 spec->type = FORMAT_TYPE_PTRDIFF;
1320 } else if (spec->qualifier == 'H') {
1321 if (spec->flags & SIGN)
1322 spec->type = FORMAT_TYPE_BYTE;
1323 else
1324 spec->type = FORMAT_TYPE_UBYTE;
1325 } else if (spec->qualifier == 'h') {
1326 if (spec->flags & SIGN)
1327 spec->type = FORMAT_TYPE_SHORT;
1328 else
1329 spec->type = FORMAT_TYPE_USHORT;
1330 } else {
1331 if (spec->flags & SIGN)
1332 spec->type = FORMAT_TYPE_INT;
1333 else
1334 spec->type = FORMAT_TYPE_UINT;
1335 }
1336
1337 return ++fmt - start;
1338 }
1339
1340 /**
1341 * vsnprintf - Format a string and place it in a buffer
1342 * @buf: The buffer to place the result into
1343 * @size: The size of the buffer, including the trailing null space
1344 * @fmt: The format string to use
1345 * @args: Arguments for the format string
1346 *
1347 * This function follows C99 vsnprintf, but has some extensions:
1348 * %pS output the name of a text symbol with offset
1349 * %ps output the name of a text symbol without offset
1350 * %pF output the name of a function pointer with its offset
1351 * %pf output the name of a function pointer without its offset
1352 * %pB output the name of a backtrace symbol with its offset
1353 * %pR output the address range in a struct resource with decoded flags
1354 * %pr output the address range in a struct resource with raw flags
1355 * %pM output a 6-byte MAC address with colons
1356 * %pMR output a 6-byte MAC address with colons in reversed order
1357 * %pMF output a 6-byte MAC address with dashes
1358 * %pm output a 6-byte MAC address without colons
1359 * %pmR output a 6-byte MAC address without colons in reversed order
1360 * %pI4 print an IPv4 address without leading zeros
1361 * %pi4 print an IPv4 address with leading zeros
1362 * %pI6 print an IPv6 address with colons
1363 * %pi6 print an IPv6 address without colons
1364 * %pI6c print an IPv6 address as specified by RFC 5952
1365 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1366 * case.
1367 * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
1368 * bytes of the input)
1369 * %n is ignored
1370 *
1371 * ** Please update Documentation/printk-formats.txt when making changes **
1372 *
1373 * The return value is the number of characters which would
1374 * be generated for the given input, excluding the trailing
1375 * '\0', as per ISO C99. If you want to have the exact
1376 * number of characters written into @buf as return value
1377 * (not including the trailing '\0'), use vscnprintf(). If the
1378 * return is greater than or equal to @size, the resulting
1379 * string is truncated.
1380 *
1381 * If you're not already dealing with a va_list consider using snprintf().
1382 */
1383 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1384 {
1385 unsigned long long num;
1386 char *str, *end;
1387 struct printf_spec spec = {0};
1388
1389 /* Reject out-of-range values early. Large positive sizes are
1390 used for unknown buffer sizes. */
1391 if (WARN_ON_ONCE((int) size < 0))
1392 return 0;
1393
1394 str = buf;
1395 end = buf + size;
1396
1397 /* Make sure end is always >= buf */
1398 if (end < buf) {
1399 end = ((void *)-1);
1400 size = end - buf;
1401 }
1402
1403 while (*fmt) {
1404 const char *old_fmt = fmt;
1405 int read = format_decode(fmt, &spec);
1406
1407 fmt += read;
1408
1409 switch (spec.type) {
1410 case FORMAT_TYPE_NONE: {
1411 int copy = read;
1412 if (str < end) {
1413 if (copy > end - str)
1414 copy = end - str;
1415 memcpy(str, old_fmt, copy);
1416 }
1417 str += read;
1418 break;
1419 }
1420
1421 case FORMAT_TYPE_WIDTH:
1422 spec.field_width = va_arg(args, int);
1423 break;
1424
1425 case FORMAT_TYPE_PRECISION:
1426 spec.precision = va_arg(args, int);
1427 break;
1428
1429 case FORMAT_TYPE_CHAR: {
1430 char c;
1431
1432 if (!(spec.flags & LEFT)) {
1433 while (--spec.field_width > 0) {
1434 if (str < end)
1435 *str = ' ';
1436 ++str;
1437
1438 }
1439 }
1440 c = (unsigned char) va_arg(args, int);
1441 if (str < end)
1442 *str = c;
1443 ++str;
1444 while (--spec.field_width > 0) {
1445 if (str < end)
1446 *str = ' ';
1447 ++str;
1448 }
1449 break;
1450 }
1451
1452 case FORMAT_TYPE_STR:
1453 str = string(str, end, va_arg(args, char *), spec);
1454 break;
1455
1456 case FORMAT_TYPE_PTR:
1457 str = pointer(fmt+1, str, end, va_arg(args, void *),
1458 spec);
1459 while (isalnum(*fmt))
1460 fmt++;
1461 break;
1462
1463 case FORMAT_TYPE_PERCENT_CHAR:
1464 if (str < end)
1465 *str = '%';
1466 ++str;
1467 break;
1468
1469 case FORMAT_TYPE_INVALID:
1470 if (str < end)
1471 *str = '%';
1472 ++str;
1473 break;
1474
1475 case FORMAT_TYPE_NRCHARS: {
1476 u8 qualifier = spec.qualifier;
1477
1478 if (qualifier == 'l') {
1479 long *ip = va_arg(args, long *);
1480 *ip = (str - buf);
1481 } else if (_tolower(qualifier) == 'z') {
1482 size_t *ip = va_arg(args, size_t *);
1483 *ip = (str - buf);
1484 } else {
1485 int *ip = va_arg(args, int *);
1486 *ip = (str - buf);
1487 }
1488 break;
1489 }
1490
1491 default:
1492 switch (spec.type) {
1493 case FORMAT_TYPE_LONG_LONG:
1494 num = va_arg(args, long long);
1495 break;
1496 case FORMAT_TYPE_ULONG:
1497 num = va_arg(args, unsigned long);
1498 break;
1499 case FORMAT_TYPE_LONG:
1500 num = va_arg(args, long);
1501 break;
1502 case FORMAT_TYPE_SIZE_T:
1503 if (spec.flags & SIGN)
1504 num = va_arg(args, ssize_t);
1505 else
1506 num = va_arg(args, size_t);
1507 break;
1508 case FORMAT_TYPE_PTRDIFF:
1509 num = va_arg(args, ptrdiff_t);
1510 break;
1511 case FORMAT_TYPE_UBYTE:
1512 num = (unsigned char) va_arg(args, int);
1513 break;
1514 case FORMAT_TYPE_BYTE:
1515 num = (signed char) va_arg(args, int);
1516 break;
1517 case FORMAT_TYPE_USHORT:
1518 num = (unsigned short) va_arg(args, int);
1519 break;
1520 case FORMAT_TYPE_SHORT:
1521 num = (short) va_arg(args, int);
1522 break;
1523 case FORMAT_TYPE_INT:
1524 num = (int) va_arg(args, int);
1525 break;
1526 default:
1527 num = va_arg(args, unsigned int);
1528 }
1529
1530 str = number(str, end, num, spec);
1531 }
1532 }
1533
1534 if (size > 0) {
1535 if (str < end)
1536 *str = '\0';
1537 else
1538 end[-1] = '\0';
1539 }
1540
1541 /* the trailing null byte doesn't count towards the total */
1542 return str-buf;
1543
1544 }
1545 EXPORT_SYMBOL(vsnprintf);
1546
1547 /**
1548 * vscnprintf - Format a string and place it in a buffer
1549 * @buf: The buffer to place the result into
1550 * @size: The size of the buffer, including the trailing null space
1551 * @fmt: The format string to use
1552 * @args: Arguments for the format string
1553 *
1554 * The return value is the number of characters which have been written into
1555 * the @buf not including the trailing '\0'. If @size is == 0 the function
1556 * returns 0.
1557 *
1558 * If you're not already dealing with a va_list consider using scnprintf().
1559 *
1560 * See the vsnprintf() documentation for format string extensions over C99.
1561 */
1562 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1563 {
1564 int i;
1565
1566 i = vsnprintf(buf, size, fmt, args);
1567
1568 if (likely(i < size))
1569 return i;
1570 if (size != 0)
1571 return size - 1;
1572 return 0;
1573 }
1574 EXPORT_SYMBOL(vscnprintf);
1575
1576 /**
1577 * snprintf - Format a string and place it in a buffer
1578 * @buf: The buffer to place the result into
1579 * @size: The size of the buffer, including the trailing null space
1580 * @fmt: The format string to use
1581 * @...: Arguments for the format string
1582 *
1583 * The return value is the number of characters which would be
1584 * generated for the given input, excluding the trailing null,
1585 * as per ISO C99. If the return is greater than or equal to
1586 * @size, the resulting string is truncated.
1587 *
1588 * See the vsnprintf() documentation for format string extensions over C99.
1589 */
1590 int snprintf(char *buf, size_t size, const char *fmt, ...)
1591 {
1592 va_list args;
1593 int i;
1594
1595 va_start(args, fmt);
1596 i = vsnprintf(buf, size, fmt, args);
1597 va_end(args);
1598
1599 return i;
1600 }
1601 EXPORT_SYMBOL(snprintf);
1602
1603 /**
1604 * scnprintf - Format a string and place it in a buffer
1605 * @buf: The buffer to place the result into
1606 * @size: The size of the buffer, including the trailing null space
1607 * @fmt: The format string to use
1608 * @...: Arguments for the format string
1609 *
1610 * The return value is the number of characters written into @buf not including
1611 * the trailing '\0'. If @size is == 0 the function returns 0.
1612 */
1613
1614 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1615 {
1616 va_list args;
1617 int i;
1618
1619 va_start(args, fmt);
1620 i = vscnprintf(buf, size, fmt, args);
1621 va_end(args);
1622
1623 return i;
1624 }
1625 EXPORT_SYMBOL(scnprintf);
1626
1627 /**
1628 * vsprintf - Format a string and place it in a buffer
1629 * @buf: The buffer to place the result into
1630 * @fmt: The format string to use
1631 * @args: Arguments for the format string
1632 *
1633 * The function returns the number of characters written
1634 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1635 * buffer overflows.
1636 *
1637 * If you're not already dealing with a va_list consider using sprintf().
1638 *
1639 * See the vsnprintf() documentation for format string extensions over C99.
1640 */
1641 int vsprintf(char *buf, const char *fmt, va_list args)
1642 {
1643 return vsnprintf(buf, INT_MAX, fmt, args);
1644 }
1645 EXPORT_SYMBOL(vsprintf);
1646
1647 /**
1648 * sprintf - Format a string and place it in a buffer
1649 * @buf: The buffer to place the result into
1650 * @fmt: The format string to use
1651 * @...: Arguments for the format string
1652 *
1653 * The function returns the number of characters written
1654 * into @buf. Use snprintf() or scnprintf() in order to avoid
1655 * buffer overflows.
1656 *
1657 * See the vsnprintf() documentation for format string extensions over C99.
1658 */
1659 int sprintf(char *buf, const char *fmt, ...)
1660 {
1661 va_list args;
1662 int i;
1663
1664 va_start(args, fmt);
1665 i = vsnprintf(buf, INT_MAX, fmt, args);
1666 va_end(args);
1667
1668 return i;
1669 }
1670 EXPORT_SYMBOL(sprintf);
1671
1672 #ifdef CONFIG_BINARY_PRINTF
1673 /*
1674 * bprintf service:
1675 * vbin_printf() - VA arguments to binary data
1676 * bstr_printf() - Binary data to text string
1677 */
1678
1679 /**
1680 * vbin_printf - Parse a format string and place args' binary value in a buffer
1681 * @bin_buf: The buffer to place args' binary value
1682 * @size: The size of the buffer(by words(32bits), not characters)
1683 * @fmt: The format string to use
1684 * @args: Arguments for the format string
1685 *
1686 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1687 * is skiped.
1688 *
1689 * The return value is the number of words(32bits) which would be generated for
1690 * the given input.
1691 *
1692 * NOTE:
1693 * If the return value is greater than @size, the resulting bin_buf is NOT
1694 * valid for bstr_printf().
1695 */
1696 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1697 {
1698 struct printf_spec spec = {0};
1699 char *str, *end;
1700
1701 str = (char *)bin_buf;
1702 end = (char *)(bin_buf + size);
1703
1704 #define save_arg(type) \
1705 do { \
1706 if (sizeof(type) == 8) { \
1707 unsigned long long value; \
1708 str = PTR_ALIGN(str, sizeof(u32)); \
1709 value = va_arg(args, unsigned long long); \
1710 if (str + sizeof(type) <= end) { \
1711 *(u32 *)str = *(u32 *)&value; \
1712 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1713 } \
1714 } else { \
1715 unsigned long value; \
1716 str = PTR_ALIGN(str, sizeof(type)); \
1717 value = va_arg(args, int); \
1718 if (str + sizeof(type) <= end) \
1719 *(typeof(type) *)str = (type)value; \
1720 } \
1721 str += sizeof(type); \
1722 } while (0)
1723
1724 while (*fmt) {
1725 int read = format_decode(fmt, &spec);
1726
1727 fmt += read;
1728
1729 switch (spec.type) {
1730 case FORMAT_TYPE_NONE:
1731 case FORMAT_TYPE_INVALID:
1732 case FORMAT_TYPE_PERCENT_CHAR:
1733 break;
1734
1735 case FORMAT_TYPE_WIDTH:
1736 case FORMAT_TYPE_PRECISION:
1737 save_arg(int);
1738 break;
1739
1740 case FORMAT_TYPE_CHAR:
1741 save_arg(char);
1742 break;
1743
1744 case FORMAT_TYPE_STR: {
1745 const char *save_str = va_arg(args, char *);
1746 size_t len;
1747
1748 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1749 || (unsigned long)save_str < PAGE_SIZE)
1750 save_str = "(null)";
1751 len = strlen(save_str) + 1;
1752 if (str + len < end)
1753 memcpy(str, save_str, len);
1754 str += len;
1755 break;
1756 }
1757
1758 case FORMAT_TYPE_PTR:
1759 save_arg(void *);
1760 /* skip all alphanumeric pointer suffixes */
1761 while (isalnum(*fmt))
1762 fmt++;
1763 break;
1764
1765 case FORMAT_TYPE_NRCHARS: {
1766 /* skip %n 's argument */
1767 u8 qualifier = spec.qualifier;
1768 void *skip_arg;
1769 if (qualifier == 'l')
1770 skip_arg = va_arg(args, long *);
1771 else if (_tolower(qualifier) == 'z')
1772 skip_arg = va_arg(args, size_t *);
1773 else
1774 skip_arg = va_arg(args, int *);
1775 break;
1776 }
1777
1778 default:
1779 switch (spec.type) {
1780
1781 case FORMAT_TYPE_LONG_LONG:
1782 save_arg(long long);
1783 break;
1784 case FORMAT_TYPE_ULONG:
1785 case FORMAT_TYPE_LONG:
1786 save_arg(unsigned long);
1787 break;
1788 case FORMAT_TYPE_SIZE_T:
1789 save_arg(size_t);
1790 break;
1791 case FORMAT_TYPE_PTRDIFF:
1792 save_arg(ptrdiff_t);
1793 break;
1794 case FORMAT_TYPE_UBYTE:
1795 case FORMAT_TYPE_BYTE:
1796 save_arg(char);
1797 break;
1798 case FORMAT_TYPE_USHORT:
1799 case FORMAT_TYPE_SHORT:
1800 save_arg(short);
1801 break;
1802 default:
1803 save_arg(int);
1804 }
1805 }
1806 }
1807
1808 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1809 #undef save_arg
1810 }
1811 EXPORT_SYMBOL_GPL(vbin_printf);
1812
1813 /**
1814 * bstr_printf - Format a string from binary arguments and place it in a buffer
1815 * @buf: The buffer to place the result into
1816 * @size: The size of the buffer, including the trailing null space
1817 * @fmt: The format string to use
1818 * @bin_buf: Binary arguments for the format string
1819 *
1820 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1821 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1822 * a binary buffer that generated by vbin_printf.
1823 *
1824 * The format follows C99 vsnprintf, but has some extensions:
1825 * see vsnprintf comment for details.
1826 *
1827 * The return value is the number of characters which would
1828 * be generated for the given input, excluding the trailing
1829 * '\0', as per ISO C99. If you want to have the exact
1830 * number of characters written into @buf as return value
1831 * (not including the trailing '\0'), use vscnprintf(). If the
1832 * return is greater than or equal to @size, the resulting
1833 * string is truncated.
1834 */
1835 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1836 {
1837 struct printf_spec spec = {0};
1838 char *str, *end;
1839 const char *args = (const char *)bin_buf;
1840
1841 if (WARN_ON_ONCE((int) size < 0))
1842 return 0;
1843
1844 str = buf;
1845 end = buf + size;
1846
1847 #define get_arg(type) \
1848 ({ \
1849 typeof(type) value; \
1850 if (sizeof(type) == 8) { \
1851 args = PTR_ALIGN(args, sizeof(u32)); \
1852 *(u32 *)&value = *(u32 *)args; \
1853 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1854 } else { \
1855 args = PTR_ALIGN(args, sizeof(type)); \
1856 value = *(typeof(type) *)args; \
1857 } \
1858 args += sizeof(type); \
1859 value; \
1860 })
1861
1862 /* Make sure end is always >= buf */
1863 if (end < buf) {
1864 end = ((void *)-1);
1865 size = end - buf;
1866 }
1867
1868 while (*fmt) {
1869 const char *old_fmt = fmt;
1870 int read = format_decode(fmt, &spec);
1871
1872 fmt += read;
1873
1874 switch (spec.type) {
1875 case FORMAT_TYPE_NONE: {
1876 int copy = read;
1877 if (str < end) {
1878 if (copy > end - str)
1879 copy = end - str;
1880 memcpy(str, old_fmt, copy);
1881 }
1882 str += read;
1883 break;
1884 }
1885
1886 case FORMAT_TYPE_WIDTH:
1887 spec.field_width = get_arg(int);
1888 break;
1889
1890 case FORMAT_TYPE_PRECISION:
1891 spec.precision = get_arg(int);
1892 break;
1893
1894 case FORMAT_TYPE_CHAR: {
1895 char c;
1896
1897 if (!(spec.flags & LEFT)) {
1898 while (--spec.field_width > 0) {
1899 if (str < end)
1900 *str = ' ';
1901 ++str;
1902 }
1903 }
1904 c = (unsigned char) get_arg(char);
1905 if (str < end)
1906 *str = c;
1907 ++str;
1908 while (--spec.field_width > 0) {
1909 if (str < end)
1910 *str = ' ';
1911 ++str;
1912 }
1913 break;
1914 }
1915
1916 case FORMAT_TYPE_STR: {
1917 const char *str_arg = args;
1918 args += strlen(str_arg) + 1;
1919 str = string(str, end, (char *)str_arg, spec);
1920 break;
1921 }
1922
1923 case FORMAT_TYPE_PTR:
1924 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1925 while (isalnum(*fmt))
1926 fmt++;
1927 break;
1928
1929 case FORMAT_TYPE_PERCENT_CHAR:
1930 case FORMAT_TYPE_INVALID:
1931 if (str < end)
1932 *str = '%';
1933 ++str;
1934 break;
1935
1936 case FORMAT_TYPE_NRCHARS:
1937 /* skip */
1938 break;
1939
1940 default: {
1941 unsigned long long num;
1942
1943 switch (spec.type) {
1944
1945 case FORMAT_TYPE_LONG_LONG:
1946 num = get_arg(long long);
1947 break;
1948 case FORMAT_TYPE_ULONG:
1949 case FORMAT_TYPE_LONG:
1950 num = get_arg(unsigned long);
1951 break;
1952 case FORMAT_TYPE_SIZE_T:
1953 num = get_arg(size_t);
1954 break;
1955 case FORMAT_TYPE_PTRDIFF:
1956 num = get_arg(ptrdiff_t);
1957 break;
1958 case FORMAT_TYPE_UBYTE:
1959 num = get_arg(unsigned char);
1960 break;
1961 case FORMAT_TYPE_BYTE:
1962 num = get_arg(signed char);
1963 break;
1964 case FORMAT_TYPE_USHORT:
1965 num = get_arg(unsigned short);
1966 break;
1967 case FORMAT_TYPE_SHORT:
1968 num = get_arg(short);
1969 break;
1970 case FORMAT_TYPE_UINT:
1971 num = get_arg(unsigned int);
1972 break;
1973 default:
1974 num = get_arg(int);
1975 }
1976
1977 str = number(str, end, num, spec);
1978 } /* default: */
1979 } /* switch(spec.type) */
1980 } /* while(*fmt) */
1981
1982 if (size > 0) {
1983 if (str < end)
1984 *str = '\0';
1985 else
1986 end[-1] = '\0';
1987 }
1988
1989 #undef get_arg
1990
1991 /* the trailing null byte doesn't count towards the total */
1992 return str - buf;
1993 }
1994 EXPORT_SYMBOL_GPL(bstr_printf);
1995
1996 /**
1997 * bprintf - Parse a format string and place args' binary value in a buffer
1998 * @bin_buf: The buffer to place args' binary value
1999 * @size: The size of the buffer(by words(32bits), not characters)
2000 * @fmt: The format string to use
2001 * @...: Arguments for the format string
2002 *
2003 * The function returns the number of words(u32) written
2004 * into @bin_buf.
2005 */
2006 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
2007 {
2008 va_list args;
2009 int ret;
2010
2011 va_start(args, fmt);
2012 ret = vbin_printf(bin_buf, size, fmt, args);
2013 va_end(args);
2014
2015 return ret;
2016 }
2017 EXPORT_SYMBOL_GPL(bprintf);
2018
2019 #endif /* CONFIG_BINARY_PRINTF */
2020
2021 /**
2022 * vsscanf - Unformat a buffer into a list of arguments
2023 * @buf: input buffer
2024 * @fmt: format of buffer
2025 * @args: arguments
2026 */
2027 int vsscanf(const char *buf, const char *fmt, va_list args)
2028 {
2029 const char *str = buf;
2030 char *next;
2031 char digit;
2032 int num = 0;
2033 u8 qualifier;
2034 unsigned int base;
2035 union {
2036 long long s;
2037 unsigned long long u;
2038 } val;
2039 s16 field_width;
2040 bool is_sign;
2041
2042 while (*fmt) {
2043 /* skip any white space in format */
2044 /* white space in format matchs any amount of
2045 * white space, including none, in the input.
2046 */
2047 if (isspace(*fmt)) {
2048 fmt = skip_spaces(++fmt);
2049 str = skip_spaces(str);
2050 }
2051
2052 /* anything that is not a conversion must match exactly */
2053 if (*fmt != '%' && *fmt) {
2054 if (*fmt++ != *str++)
2055 break;
2056 continue;
2057 }
2058
2059 if (!*fmt)
2060 break;
2061 ++fmt;
2062
2063 /* skip this conversion.
2064 * advance both strings to next white space
2065 */
2066 if (*fmt == '*') {
2067 if (!*str)
2068 break;
2069 while (!isspace(*fmt) && *fmt != '%' && *fmt)
2070 fmt++;
2071 while (!isspace(*str) && *str)
2072 str++;
2073 continue;
2074 }
2075
2076 /* get field width */
2077 field_width = -1;
2078 if (isdigit(*fmt)) {
2079 field_width = skip_atoi(&fmt);
2080 if (field_width <= 0)
2081 break;
2082 }
2083
2084 /* get conversion qualifier */
2085 qualifier = -1;
2086 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2087 _tolower(*fmt) == 'z') {
2088 qualifier = *fmt++;
2089 if (unlikely(qualifier == *fmt)) {
2090 if (qualifier == 'h') {
2091 qualifier = 'H';
2092 fmt++;
2093 } else if (qualifier == 'l') {
2094 qualifier = 'L';
2095 fmt++;
2096 }
2097 }
2098 }
2099
2100 if (!*fmt)
2101 break;
2102
2103 if (*fmt == 'n') {
2104 /* return number of characters read so far */
2105 *va_arg(args, int *) = str - buf;
2106 ++fmt;
2107 continue;
2108 }
2109
2110 if (!*str)
2111 break;
2112
2113 base = 10;
2114 is_sign = 0;
2115
2116 switch (*fmt++) {
2117 case 'c':
2118 {
2119 char *s = (char *)va_arg(args, char*);
2120 if (field_width == -1)
2121 field_width = 1;
2122 do {
2123 *s++ = *str++;
2124 } while (--field_width > 0 && *str);
2125 num++;
2126 }
2127 continue;
2128 case 's':
2129 {
2130 char *s = (char *)va_arg(args, char *);
2131 if (field_width == -1)
2132 field_width = SHRT_MAX;
2133 /* first, skip leading white space in buffer */
2134 str = skip_spaces(str);
2135
2136 /* now copy until next white space */
2137 while (*str && !isspace(*str) && field_width--)
2138 *s++ = *str++;
2139 *s = '\0';
2140 num++;
2141 }
2142 continue;
2143 case 'o':
2144 base = 8;
2145 break;
2146 case 'x':
2147 case 'X':
2148 base = 16;
2149 break;
2150 case 'i':
2151 base = 0;
2152 case 'd':
2153 is_sign = 1;
2154 case 'u':
2155 break;
2156 case '%':
2157 /* looking for '%' in str */
2158 if (*str++ != '%')
2159 return num;
2160 continue;
2161 default:
2162 /* invalid format; stop here */
2163 return num;
2164 }
2165
2166 /* have some sort of integer conversion.
2167 * first, skip white space in buffer.
2168 */
2169 str = skip_spaces(str);
2170
2171 digit = *str;
2172 if (is_sign && digit == '-')
2173 digit = *(str + 1);
2174
2175 if (!digit
2176 || (base == 16 && !isxdigit(digit))
2177 || (base == 10 && !isdigit(digit))
2178 || (base == 8 && (!isdigit(digit) || digit > '7'))
2179 || (base == 0 && !isdigit(digit)))
2180 break;
2181
2182 if (is_sign)
2183 val.s = qualifier != 'L' ?
2184 simple_strtol(str, &next, base) :
2185 simple_strtoll(str, &next, base);
2186 else
2187 val.u = qualifier != 'L' ?
2188 simple_strtoul(str, &next, base) :
2189 simple_strtoull(str, &next, base);
2190
2191 if (field_width > 0 && next - str > field_width) {
2192 if (base == 0)
2193 _parse_integer_fixup_radix(str, &base);
2194 while (next - str > field_width) {
2195 if (is_sign)
2196 val.s = div_s64(val.s, base);
2197 else
2198 val.u = div_u64(val.u, base);
2199 --next;
2200 }
2201 }
2202
2203 switch (qualifier) {
2204 case 'H': /* that's 'hh' in format */
2205 if (is_sign)
2206 *va_arg(args, signed char *) = val.s;
2207 else
2208 *va_arg(args, unsigned char *) = val.u;
2209 break;
2210 case 'h':
2211 if (is_sign)
2212 *va_arg(args, short *) = val.s;
2213 else
2214 *va_arg(args, unsigned short *) = val.u;
2215 break;
2216 case 'l':
2217 if (is_sign)
2218 *va_arg(args, long *) = val.s;
2219 else
2220 *va_arg(args, unsigned long *) = val.u;
2221 break;
2222 case 'L':
2223 if (is_sign)
2224 *va_arg(args, long long *) = val.s;
2225 else
2226 *va_arg(args, unsigned long long *) = val.u;
2227 break;
2228 case 'Z':
2229 case 'z':
2230 *va_arg(args, size_t *) = val.u;
2231 break;
2232 default:
2233 if (is_sign)
2234 *va_arg(args, int *) = val.s;
2235 else
2236 *va_arg(args, unsigned int *) = val.u;
2237 break;
2238 }
2239 num++;
2240
2241 if (!next)
2242 break;
2243 str = next;
2244 }
2245
2246 return num;
2247 }
2248 EXPORT_SYMBOL(vsscanf);
2249
2250 /**
2251 * sscanf - Unformat a buffer into a list of arguments
2252 * @buf: input buffer
2253 * @fmt: formatting of buffer
2254 * @...: resulting arguments
2255 */
2256 int sscanf(const char *buf, const char *fmt, ...)
2257 {
2258 va_list args;
2259 int i;
2260
2261 va_start(args, fmt);
2262 i = vsscanf(buf, fmt, args);
2263 va_end(args);
2264
2265 return i;
2266 }
2267 EXPORT_SYMBOL(sscanf);
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