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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/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 <linux/of.h>
35 #include <net/addrconf.h>
36 #ifdef CONFIG_BLOCK
37 #include <linux/blkdev.h>
38 #endif
39
40 #include "../mm/internal.h" /* For the trace_print_flags arrays */
41
42 #include <asm/page.h> /* for PAGE_SIZE */
43 #include <asm/sections.h> /* for dereference_function_descriptor() */
44 #include <asm/byteorder.h> /* cpu_to_le16 */
45
46 #include <linux/string_helpers.h>
47 #include "kstrtox.h"
48
49 /**
50 * simple_strtoull - convert a string to an unsigned long long
51 * @cp: The start of the string
52 * @endp: A pointer to the end of the parsed string will be placed here
53 * @base: The number base to use
54 *
55 * This function is obsolete. Please use kstrtoull instead.
56 */
57 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
58 {
59 unsigned long long result;
60 unsigned int rv;
61
62 cp = _parse_integer_fixup_radix(cp, &base);
63 rv = _parse_integer(cp, base, &result);
64 /* FIXME */
65 cp += (rv & ~KSTRTOX_OVERFLOW);
66
67 if (endp)
68 *endp = (char *)cp;
69
70 return result;
71 }
72 EXPORT_SYMBOL(simple_strtoull);
73
74 /**
75 * simple_strtoul - convert a string to an unsigned long
76 * @cp: The start of the string
77 * @endp: A pointer to the end of the parsed string will be placed here
78 * @base: The number base to use
79 *
80 * This function is obsolete. Please use kstrtoul instead.
81 */
82 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
83 {
84 return simple_strtoull(cp, endp, base);
85 }
86 EXPORT_SYMBOL(simple_strtoul);
87
88 /**
89 * simple_strtol - convert a string to a signed long
90 * @cp: The start of the string
91 * @endp: A pointer to the end of the parsed string will be placed here
92 * @base: The number base to use
93 *
94 * This function is obsolete. Please use kstrtol instead.
95 */
96 long simple_strtol(const char *cp, char **endp, unsigned int base)
97 {
98 if (*cp == '-')
99 return -simple_strtoul(cp + 1, endp, base);
100
101 return simple_strtoul(cp, endp, base);
102 }
103 EXPORT_SYMBOL(simple_strtol);
104
105 /**
106 * simple_strtoll - convert a string to a signed long long
107 * @cp: The start of the string
108 * @endp: A pointer to the end of the parsed string will be placed here
109 * @base: The number base to use
110 *
111 * This function is obsolete. Please use kstrtoll instead.
112 */
113 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
114 {
115 if (*cp == '-')
116 return -simple_strtoull(cp + 1, endp, base);
117
118 return simple_strtoull(cp, endp, base);
119 }
120 EXPORT_SYMBOL(simple_strtoll);
121
122 static noinline_for_stack
123 int skip_atoi(const char **s)
124 {
125 int i = 0;
126
127 do {
128 i = i*10 + *((*s)++) - '0';
129 } while (isdigit(**s));
130
131 return i;
132 }
133
134 /*
135 * Decimal conversion is by far the most typical, and is used for
136 * /proc and /sys data. This directly impacts e.g. top performance
137 * with many processes running. We optimize it for speed by emitting
138 * two characters at a time, using a 200 byte lookup table. This
139 * roughly halves the number of multiplications compared to computing
140 * the digits one at a time. Implementation strongly inspired by the
141 * previous version, which in turn used ideas described at
142 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
143 * from the author, Douglas W. Jones).
144 *
145 * It turns out there is precisely one 26 bit fixed-point
146 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
147 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
148 * range happens to be somewhat larger (x <= 1073741898), but that's
149 * irrelevant for our purpose.
150 *
151 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
152 * need a 32x32->64 bit multiply, so we simply use the same constant.
153 *
154 * For dividing a number in the range [100, 10^4-1] by 100, there are
155 * several options. The simplest is (x * 0x147b) >> 19, which is valid
156 * for all x <= 43698.
157 */
158
159 static const u16 decpair[100] = {
160 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
161 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
162 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
163 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
164 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
165 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
166 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
167 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
168 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
169 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
170 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
171 #undef _
172 };
173
174 /*
175 * This will print a single '0' even if r == 0, since we would
176 * immediately jump to out_r where two 0s would be written but only
177 * one of them accounted for in buf. This is needed by ip4_string
178 * below. All other callers pass a non-zero value of r.
179 */
180 static noinline_for_stack
181 char *put_dec_trunc8(char *buf, unsigned r)
182 {
183 unsigned q;
184
185 /* 1 <= r < 10^8 */
186 if (r < 100)
187 goto out_r;
188
189 /* 100 <= r < 10^8 */
190 q = (r * (u64)0x28f5c29) >> 32;
191 *((u16 *)buf) = decpair[r - 100*q];
192 buf += 2;
193
194 /* 1 <= q < 10^6 */
195 if (q < 100)
196 goto out_q;
197
198 /* 100 <= q < 10^6 */
199 r = (q * (u64)0x28f5c29) >> 32;
200 *((u16 *)buf) = decpair[q - 100*r];
201 buf += 2;
202
203 /* 1 <= r < 10^4 */
204 if (r < 100)
205 goto out_r;
206
207 /* 100 <= r < 10^4 */
208 q = (r * 0x147b) >> 19;
209 *((u16 *)buf) = decpair[r - 100*q];
210 buf += 2;
211 out_q:
212 /* 1 <= q < 100 */
213 r = q;
214 out_r:
215 /* 1 <= r < 100 */
216 *((u16 *)buf) = decpair[r];
217 buf += r < 10 ? 1 : 2;
218 return buf;
219 }
220
221 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
222 static noinline_for_stack
223 char *put_dec_full8(char *buf, unsigned r)
224 {
225 unsigned q;
226
227 /* 0 <= r < 10^8 */
228 q = (r * (u64)0x28f5c29) >> 32;
229 *((u16 *)buf) = decpair[r - 100*q];
230 buf += 2;
231
232 /* 0 <= q < 10^6 */
233 r = (q * (u64)0x28f5c29) >> 32;
234 *((u16 *)buf) = decpair[q - 100*r];
235 buf += 2;
236
237 /* 0 <= r < 10^4 */
238 q = (r * 0x147b) >> 19;
239 *((u16 *)buf) = decpair[r - 100*q];
240 buf += 2;
241
242 /* 0 <= q < 100 */
243 *((u16 *)buf) = decpair[q];
244 buf += 2;
245 return buf;
246 }
247
248 static noinline_for_stack
249 char *put_dec(char *buf, unsigned long long n)
250 {
251 if (n >= 100*1000*1000)
252 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
253 /* 1 <= n <= 1.6e11 */
254 if (n >= 100*1000*1000)
255 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
256 /* 1 <= n < 1e8 */
257 return put_dec_trunc8(buf, n);
258 }
259
260 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
261
262 static void
263 put_dec_full4(char *buf, unsigned r)
264 {
265 unsigned q;
266
267 /* 0 <= r < 10^4 */
268 q = (r * 0x147b) >> 19;
269 *((u16 *)buf) = decpair[r - 100*q];
270 buf += 2;
271 /* 0 <= q < 100 */
272 *((u16 *)buf) = decpair[q];
273 }
274
275 /*
276 * Call put_dec_full4 on x % 10000, return x / 10000.
277 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
278 * holds for all x < 1,128,869,999. The largest value this
279 * helper will ever be asked to convert is 1,125,520,955.
280 * (second call in the put_dec code, assuming n is all-ones).
281 */
282 static noinline_for_stack
283 unsigned put_dec_helper4(char *buf, unsigned x)
284 {
285 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
286
287 put_dec_full4(buf, x - q * 10000);
288 return q;
289 }
290
291 /* Based on code by Douglas W. Jones found at
292 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
293 * (with permission from the author).
294 * Performs no 64-bit division and hence should be fast on 32-bit machines.
295 */
296 static
297 char *put_dec(char *buf, unsigned long long n)
298 {
299 uint32_t d3, d2, d1, q, h;
300
301 if (n < 100*1000*1000)
302 return put_dec_trunc8(buf, n);
303
304 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
305 h = (n >> 32);
306 d2 = (h ) & 0xffff;
307 d3 = (h >> 16); /* implicit "& 0xffff" */
308
309 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
310 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
311 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
312 q = put_dec_helper4(buf, q);
313
314 q += 7671 * d3 + 9496 * d2 + 6 * d1;
315 q = put_dec_helper4(buf+4, q);
316
317 q += 4749 * d3 + 42 * d2;
318 q = put_dec_helper4(buf+8, q);
319
320 q += 281 * d3;
321 buf += 12;
322 if (q)
323 buf = put_dec_trunc8(buf, q);
324 else while (buf[-1] == '0')
325 --buf;
326
327 return buf;
328 }
329
330 #endif
331
332 /*
333 * Convert passed number to decimal string.
334 * Returns the length of string. On buffer overflow, returns 0.
335 *
336 * If speed is not important, use snprintf(). It's easy to read the code.
337 */
338 int num_to_str(char *buf, int size, unsigned long long num)
339 {
340 /* put_dec requires 2-byte alignment of the buffer. */
341 char tmp[sizeof(num) * 3] __aligned(2);
342 int idx, len;
343
344 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
345 if (num <= 9) {
346 tmp[0] = '0' + num;
347 len = 1;
348 } else {
349 len = put_dec(tmp, num) - tmp;
350 }
351
352 if (len > size)
353 return 0;
354 for (idx = 0; idx < len; ++idx)
355 buf[idx] = tmp[len - idx - 1];
356 return len;
357 }
358
359 #define SIGN 1 /* unsigned/signed, must be 1 */
360 #define LEFT 2 /* left justified */
361 #define PLUS 4 /* show plus */
362 #define SPACE 8 /* space if plus */
363 #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
364 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
365 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
366
367 enum format_type {
368 FORMAT_TYPE_NONE, /* Just a string part */
369 FORMAT_TYPE_WIDTH,
370 FORMAT_TYPE_PRECISION,
371 FORMAT_TYPE_CHAR,
372 FORMAT_TYPE_STR,
373 FORMAT_TYPE_PTR,
374 FORMAT_TYPE_PERCENT_CHAR,
375 FORMAT_TYPE_INVALID,
376 FORMAT_TYPE_LONG_LONG,
377 FORMAT_TYPE_ULONG,
378 FORMAT_TYPE_LONG,
379 FORMAT_TYPE_UBYTE,
380 FORMAT_TYPE_BYTE,
381 FORMAT_TYPE_USHORT,
382 FORMAT_TYPE_SHORT,
383 FORMAT_TYPE_UINT,
384 FORMAT_TYPE_INT,
385 FORMAT_TYPE_SIZE_T,
386 FORMAT_TYPE_PTRDIFF
387 };
388
389 struct printf_spec {
390 unsigned int type:8; /* format_type enum */
391 signed int field_width:24; /* width of output field */
392 unsigned int flags:8; /* flags to number() */
393 unsigned int base:8; /* number base, 8, 10 or 16 only */
394 signed int precision:16; /* # of digits/chars */
395 } __packed;
396 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
397 #define PRECISION_MAX ((1 << 15) - 1)
398
399 static noinline_for_stack
400 char *number(char *buf, char *end, unsigned long long num,
401 struct printf_spec spec)
402 {
403 /* put_dec requires 2-byte alignment of the buffer. */
404 char tmp[3 * sizeof(num)] __aligned(2);
405 char sign;
406 char locase;
407 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
408 int i;
409 bool is_zero = num == 0LL;
410 int field_width = spec.field_width;
411 int precision = spec.precision;
412
413 BUILD_BUG_ON(sizeof(struct printf_spec) != 8);
414
415 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
416 * produces same digits or (maybe lowercased) letters */
417 locase = (spec.flags & SMALL);
418 if (spec.flags & LEFT)
419 spec.flags &= ~ZEROPAD;
420 sign = 0;
421 if (spec.flags & SIGN) {
422 if ((signed long long)num < 0) {
423 sign = '-';
424 num = -(signed long long)num;
425 field_width--;
426 } else if (spec.flags & PLUS) {
427 sign = '+';
428 field_width--;
429 } else if (spec.flags & SPACE) {
430 sign = ' ';
431 field_width--;
432 }
433 }
434 if (need_pfx) {
435 if (spec.base == 16)
436 field_width -= 2;
437 else if (!is_zero)
438 field_width--;
439 }
440
441 /* generate full string in tmp[], in reverse order */
442 i = 0;
443 if (num < spec.base)
444 tmp[i++] = hex_asc_upper[num] | locase;
445 else if (spec.base != 10) { /* 8 or 16 */
446 int mask = spec.base - 1;
447 int shift = 3;
448
449 if (spec.base == 16)
450 shift = 4;
451 do {
452 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
453 num >>= shift;
454 } while (num);
455 } else { /* base 10 */
456 i = put_dec(tmp, num) - tmp;
457 }
458
459 /* printing 100 using %2d gives "100", not "00" */
460 if (i > precision)
461 precision = i;
462 /* leading space padding */
463 field_width -= precision;
464 if (!(spec.flags & (ZEROPAD | LEFT))) {
465 while (--field_width >= 0) {
466 if (buf < end)
467 *buf = ' ';
468 ++buf;
469 }
470 }
471 /* sign */
472 if (sign) {
473 if (buf < end)
474 *buf = sign;
475 ++buf;
476 }
477 /* "0x" / "0" prefix */
478 if (need_pfx) {
479 if (spec.base == 16 || !is_zero) {
480 if (buf < end)
481 *buf = '0';
482 ++buf;
483 }
484 if (spec.base == 16) {
485 if (buf < end)
486 *buf = ('X' | locase);
487 ++buf;
488 }
489 }
490 /* zero or space padding */
491 if (!(spec.flags & LEFT)) {
492 char c = ' ' + (spec.flags & ZEROPAD);
493 BUILD_BUG_ON(' ' + ZEROPAD != '0');
494 while (--field_width >= 0) {
495 if (buf < end)
496 *buf = c;
497 ++buf;
498 }
499 }
500 /* hmm even more zero padding? */
501 while (i <= --precision) {
502 if (buf < end)
503 *buf = '0';
504 ++buf;
505 }
506 /* actual digits of result */
507 while (--i >= 0) {
508 if (buf < end)
509 *buf = tmp[i];
510 ++buf;
511 }
512 /* trailing space padding */
513 while (--field_width >= 0) {
514 if (buf < end)
515 *buf = ' ';
516 ++buf;
517 }
518
519 return buf;
520 }
521
522 static noinline_for_stack
523 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
524 {
525 struct printf_spec spec;
526
527 spec.type = FORMAT_TYPE_PTR;
528 spec.field_width = 2 + 2 * size; /* 0x + hex */
529 spec.flags = SPECIAL | SMALL | ZEROPAD;
530 spec.base = 16;
531 spec.precision = -1;
532
533 return number(buf, end, num, spec);
534 }
535
536 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
537 {
538 size_t size;
539 if (buf >= end) /* nowhere to put anything */
540 return;
541 size = end - buf;
542 if (size <= spaces) {
543 memset(buf, ' ', size);
544 return;
545 }
546 if (len) {
547 if (len > size - spaces)
548 len = size - spaces;
549 memmove(buf + spaces, buf, len);
550 }
551 memset(buf, ' ', spaces);
552 }
553
554 /*
555 * Handle field width padding for a string.
556 * @buf: current buffer position
557 * @n: length of string
558 * @end: end of output buffer
559 * @spec: for field width and flags
560 * Returns: new buffer position after padding.
561 */
562 static noinline_for_stack
563 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
564 {
565 unsigned spaces;
566
567 if (likely(n >= spec.field_width))
568 return buf;
569 /* we want to pad the sucker */
570 spaces = spec.field_width - n;
571 if (!(spec.flags & LEFT)) {
572 move_right(buf - n, end, n, spaces);
573 return buf + spaces;
574 }
575 while (spaces--) {
576 if (buf < end)
577 *buf = ' ';
578 ++buf;
579 }
580 return buf;
581 }
582
583 static noinline_for_stack
584 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
585 {
586 int len = 0;
587 size_t lim = spec.precision;
588
589 if ((unsigned long)s < PAGE_SIZE)
590 s = "(null)";
591
592 while (lim--) {
593 char c = *s++;
594 if (!c)
595 break;
596 if (buf < end)
597 *buf = c;
598 ++buf;
599 ++len;
600 }
601 return widen_string(buf, len, end, spec);
602 }
603
604 static noinline_for_stack
605 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
606 const char *fmt)
607 {
608 const char *array[4], *s;
609 const struct dentry *p;
610 int depth;
611 int i, n;
612
613 switch (fmt[1]) {
614 case '2': case '3': case '4':
615 depth = fmt[1] - '0';
616 break;
617 default:
618 depth = 1;
619 }
620
621 rcu_read_lock();
622 for (i = 0; i < depth; i++, d = p) {
623 p = ACCESS_ONCE(d->d_parent);
624 array[i] = ACCESS_ONCE(d->d_name.name);
625 if (p == d) {
626 if (i)
627 array[i] = "";
628 i++;
629 break;
630 }
631 }
632 s = array[--i];
633 for (n = 0; n != spec.precision; n++, buf++) {
634 char c = *s++;
635 if (!c) {
636 if (!i)
637 break;
638 c = '/';
639 s = array[--i];
640 }
641 if (buf < end)
642 *buf = c;
643 }
644 rcu_read_unlock();
645 return widen_string(buf, n, end, spec);
646 }
647
648 #ifdef CONFIG_BLOCK
649 static noinline_for_stack
650 char *bdev_name(char *buf, char *end, struct block_device *bdev,
651 struct printf_spec spec, const char *fmt)
652 {
653 struct gendisk *hd = bdev->bd_disk;
654
655 buf = string(buf, end, hd->disk_name, spec);
656 if (bdev->bd_part->partno) {
657 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
658 if (buf < end)
659 *buf = 'p';
660 buf++;
661 }
662 buf = number(buf, end, bdev->bd_part->partno, spec);
663 }
664 return buf;
665 }
666 #endif
667
668 static noinline_for_stack
669 char *symbol_string(char *buf, char *end, void *ptr,
670 struct printf_spec spec, const char *fmt)
671 {
672 unsigned long value;
673 #ifdef CONFIG_KALLSYMS
674 char sym[KSYM_SYMBOL_LEN];
675 #endif
676
677 if (fmt[1] == 'R')
678 ptr = __builtin_extract_return_addr(ptr);
679 value = (unsigned long)ptr;
680
681 #ifdef CONFIG_KALLSYMS
682 if (*fmt == 'B')
683 sprint_backtrace(sym, value);
684 else if (*fmt != 'f' && *fmt != 's')
685 sprint_symbol(sym, value);
686 else
687 sprint_symbol_no_offset(sym, value);
688
689 return string(buf, end, sym, spec);
690 #else
691 return special_hex_number(buf, end, value, sizeof(void *));
692 #endif
693 }
694
695 static noinline_for_stack
696 char *resource_string(char *buf, char *end, struct resource *res,
697 struct printf_spec spec, const char *fmt)
698 {
699 #ifndef IO_RSRC_PRINTK_SIZE
700 #define IO_RSRC_PRINTK_SIZE 6
701 #endif
702
703 #ifndef MEM_RSRC_PRINTK_SIZE
704 #define MEM_RSRC_PRINTK_SIZE 10
705 #endif
706 static const struct printf_spec io_spec = {
707 .base = 16,
708 .field_width = IO_RSRC_PRINTK_SIZE,
709 .precision = -1,
710 .flags = SPECIAL | SMALL | ZEROPAD,
711 };
712 static const struct printf_spec mem_spec = {
713 .base = 16,
714 .field_width = MEM_RSRC_PRINTK_SIZE,
715 .precision = -1,
716 .flags = SPECIAL | SMALL | ZEROPAD,
717 };
718 static const struct printf_spec bus_spec = {
719 .base = 16,
720 .field_width = 2,
721 .precision = -1,
722 .flags = SMALL | ZEROPAD,
723 };
724 static const struct printf_spec dec_spec = {
725 .base = 10,
726 .precision = -1,
727 .flags = 0,
728 };
729 static const struct printf_spec str_spec = {
730 .field_width = -1,
731 .precision = 10,
732 .flags = LEFT,
733 };
734 static const struct printf_spec flag_spec = {
735 .base = 16,
736 .precision = -1,
737 .flags = SPECIAL | SMALL,
738 };
739
740 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
741 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
742 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
743 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
744 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
745 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
746 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
747 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
748
749 char *p = sym, *pend = sym + sizeof(sym);
750 int decode = (fmt[0] == 'R') ? 1 : 0;
751 const struct printf_spec *specp;
752
753 *p++ = '[';
754 if (res->flags & IORESOURCE_IO) {
755 p = string(p, pend, "io ", str_spec);
756 specp = &io_spec;
757 } else if (res->flags & IORESOURCE_MEM) {
758 p = string(p, pend, "mem ", str_spec);
759 specp = &mem_spec;
760 } else if (res->flags & IORESOURCE_IRQ) {
761 p = string(p, pend, "irq ", str_spec);
762 specp = &dec_spec;
763 } else if (res->flags & IORESOURCE_DMA) {
764 p = string(p, pend, "dma ", str_spec);
765 specp = &dec_spec;
766 } else if (res->flags & IORESOURCE_BUS) {
767 p = string(p, pend, "bus ", str_spec);
768 specp = &bus_spec;
769 } else {
770 p = string(p, pend, "??? ", str_spec);
771 specp = &mem_spec;
772 decode = 0;
773 }
774 if (decode && res->flags & IORESOURCE_UNSET) {
775 p = string(p, pend, "size ", str_spec);
776 p = number(p, pend, resource_size(res), *specp);
777 } else {
778 p = number(p, pend, res->start, *specp);
779 if (res->start != res->end) {
780 *p++ = '-';
781 p = number(p, pend, res->end, *specp);
782 }
783 }
784 if (decode) {
785 if (res->flags & IORESOURCE_MEM_64)
786 p = string(p, pend, " 64bit", str_spec);
787 if (res->flags & IORESOURCE_PREFETCH)
788 p = string(p, pend, " pref", str_spec);
789 if (res->flags & IORESOURCE_WINDOW)
790 p = string(p, pend, " window", str_spec);
791 if (res->flags & IORESOURCE_DISABLED)
792 p = string(p, pend, " disabled", str_spec);
793 } else {
794 p = string(p, pend, " flags ", str_spec);
795 p = number(p, pend, res->flags, flag_spec);
796 }
797 *p++ = ']';
798 *p = '\0';
799
800 return string(buf, end, sym, spec);
801 }
802
803 static noinline_for_stack
804 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
805 const char *fmt)
806 {
807 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
808 negative value, fallback to the default */
809 char separator;
810
811 if (spec.field_width == 0)
812 /* nothing to print */
813 return buf;
814
815 if (ZERO_OR_NULL_PTR(addr))
816 /* NULL pointer */
817 return string(buf, end, NULL, spec);
818
819 switch (fmt[1]) {
820 case 'C':
821 separator = ':';
822 break;
823 case 'D':
824 separator = '-';
825 break;
826 case 'N':
827 separator = 0;
828 break;
829 default:
830 separator = ' ';
831 break;
832 }
833
834 if (spec.field_width > 0)
835 len = min_t(int, spec.field_width, 64);
836
837 for (i = 0; i < len; ++i) {
838 if (buf < end)
839 *buf = hex_asc_hi(addr[i]);
840 ++buf;
841 if (buf < end)
842 *buf = hex_asc_lo(addr[i]);
843 ++buf;
844
845 if (separator && i != len - 1) {
846 if (buf < end)
847 *buf = separator;
848 ++buf;
849 }
850 }
851
852 return buf;
853 }
854
855 static noinline_for_stack
856 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
857 struct printf_spec spec, const char *fmt)
858 {
859 const int CHUNKSZ = 32;
860 int nr_bits = max_t(int, spec.field_width, 0);
861 int i, chunksz;
862 bool first = true;
863
864 /* reused to print numbers */
865 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
866
867 chunksz = nr_bits & (CHUNKSZ - 1);
868 if (chunksz == 0)
869 chunksz = CHUNKSZ;
870
871 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
872 for (; i >= 0; i -= CHUNKSZ) {
873 u32 chunkmask, val;
874 int word, bit;
875
876 chunkmask = ((1ULL << chunksz) - 1);
877 word = i / BITS_PER_LONG;
878 bit = i % BITS_PER_LONG;
879 val = (bitmap[word] >> bit) & chunkmask;
880
881 if (!first) {
882 if (buf < end)
883 *buf = ',';
884 buf++;
885 }
886 first = false;
887
888 spec.field_width = DIV_ROUND_UP(chunksz, 4);
889 buf = number(buf, end, val, spec);
890
891 chunksz = CHUNKSZ;
892 }
893 return buf;
894 }
895
896 static noinline_for_stack
897 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
898 struct printf_spec spec, const char *fmt)
899 {
900 int nr_bits = max_t(int, spec.field_width, 0);
901 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
902 int cur, rbot, rtop;
903 bool first = true;
904
905 /* reused to print numbers */
906 spec = (struct printf_spec){ .base = 10 };
907
908 rbot = cur = find_first_bit(bitmap, nr_bits);
909 while (cur < nr_bits) {
910 rtop = cur;
911 cur = find_next_bit(bitmap, nr_bits, cur + 1);
912 if (cur < nr_bits && cur <= rtop + 1)
913 continue;
914
915 if (!first) {
916 if (buf < end)
917 *buf = ',';
918 buf++;
919 }
920 first = false;
921
922 buf = number(buf, end, rbot, spec);
923 if (rbot < rtop) {
924 if (buf < end)
925 *buf = '-';
926 buf++;
927
928 buf = number(buf, end, rtop, spec);
929 }
930
931 rbot = cur;
932 }
933 return buf;
934 }
935
936 static noinline_for_stack
937 char *mac_address_string(char *buf, char *end, u8 *addr,
938 struct printf_spec spec, const char *fmt)
939 {
940 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
941 char *p = mac_addr;
942 int i;
943 char separator;
944 bool reversed = false;
945
946 switch (fmt[1]) {
947 case 'F':
948 separator = '-';
949 break;
950
951 case 'R':
952 reversed = true;
953 /* fall through */
954
955 default:
956 separator = ':';
957 break;
958 }
959
960 for (i = 0; i < 6; i++) {
961 if (reversed)
962 p = hex_byte_pack(p, addr[5 - i]);
963 else
964 p = hex_byte_pack(p, addr[i]);
965
966 if (fmt[0] == 'M' && i != 5)
967 *p++ = separator;
968 }
969 *p = '\0';
970
971 return string(buf, end, mac_addr, spec);
972 }
973
974 static noinline_for_stack
975 char *ip4_string(char *p, const u8 *addr, const char *fmt)
976 {
977 int i;
978 bool leading_zeros = (fmt[0] == 'i');
979 int index;
980 int step;
981
982 switch (fmt[2]) {
983 case 'h':
984 #ifdef __BIG_ENDIAN
985 index = 0;
986 step = 1;
987 #else
988 index = 3;
989 step = -1;
990 #endif
991 break;
992 case 'l':
993 index = 3;
994 step = -1;
995 break;
996 case 'n':
997 case 'b':
998 default:
999 index = 0;
1000 step = 1;
1001 break;
1002 }
1003 for (i = 0; i < 4; i++) {
1004 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
1005 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1006 if (leading_zeros) {
1007 if (digits < 3)
1008 *p++ = '0';
1009 if (digits < 2)
1010 *p++ = '0';
1011 }
1012 /* reverse the digits in the quad */
1013 while (digits--)
1014 *p++ = temp[digits];
1015 if (i < 3)
1016 *p++ = '.';
1017 index += step;
1018 }
1019 *p = '\0';
1020
1021 return p;
1022 }
1023
1024 static noinline_for_stack
1025 char *ip6_compressed_string(char *p, const char *addr)
1026 {
1027 int i, j, range;
1028 unsigned char zerolength[8];
1029 int longest = 1;
1030 int colonpos = -1;
1031 u16 word;
1032 u8 hi, lo;
1033 bool needcolon = false;
1034 bool useIPv4;
1035 struct in6_addr in6;
1036
1037 memcpy(&in6, addr, sizeof(struct in6_addr));
1038
1039 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1040
1041 memset(zerolength, 0, sizeof(zerolength));
1042
1043 if (useIPv4)
1044 range = 6;
1045 else
1046 range = 8;
1047
1048 /* find position of longest 0 run */
1049 for (i = 0; i < range; i++) {
1050 for (j = i; j < range; j++) {
1051 if (in6.s6_addr16[j] != 0)
1052 break;
1053 zerolength[i]++;
1054 }
1055 }
1056 for (i = 0; i < range; i++) {
1057 if (zerolength[i] > longest) {
1058 longest = zerolength[i];
1059 colonpos = i;
1060 }
1061 }
1062 if (longest == 1) /* don't compress a single 0 */
1063 colonpos = -1;
1064
1065 /* emit address */
1066 for (i = 0; i < range; i++) {
1067 if (i == colonpos) {
1068 if (needcolon || i == 0)
1069 *p++ = ':';
1070 *p++ = ':';
1071 needcolon = false;
1072 i += longest - 1;
1073 continue;
1074 }
1075 if (needcolon) {
1076 *p++ = ':';
1077 needcolon = false;
1078 }
1079 /* hex u16 without leading 0s */
1080 word = ntohs(in6.s6_addr16[i]);
1081 hi = word >> 8;
1082 lo = word & 0xff;
1083 if (hi) {
1084 if (hi > 0x0f)
1085 p = hex_byte_pack(p, hi);
1086 else
1087 *p++ = hex_asc_lo(hi);
1088 p = hex_byte_pack(p, lo);
1089 }
1090 else if (lo > 0x0f)
1091 p = hex_byte_pack(p, lo);
1092 else
1093 *p++ = hex_asc_lo(lo);
1094 needcolon = true;
1095 }
1096
1097 if (useIPv4) {
1098 if (needcolon)
1099 *p++ = ':';
1100 p = ip4_string(p, &in6.s6_addr[12], "I4");
1101 }
1102 *p = '\0';
1103
1104 return p;
1105 }
1106
1107 static noinline_for_stack
1108 char *ip6_string(char *p, const char *addr, const char *fmt)
1109 {
1110 int i;
1111
1112 for (i = 0; i < 8; i++) {
1113 p = hex_byte_pack(p, *addr++);
1114 p = hex_byte_pack(p, *addr++);
1115 if (fmt[0] == 'I' && i != 7)
1116 *p++ = ':';
1117 }
1118 *p = '\0';
1119
1120 return p;
1121 }
1122
1123 static noinline_for_stack
1124 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1125 struct printf_spec spec, const char *fmt)
1126 {
1127 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1128
1129 if (fmt[0] == 'I' && fmt[2] == 'c')
1130 ip6_compressed_string(ip6_addr, addr);
1131 else
1132 ip6_string(ip6_addr, addr, fmt);
1133
1134 return string(buf, end, ip6_addr, spec);
1135 }
1136
1137 static noinline_for_stack
1138 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1139 struct printf_spec spec, const char *fmt)
1140 {
1141 char ip4_addr[sizeof("255.255.255.255")];
1142
1143 ip4_string(ip4_addr, addr, fmt);
1144
1145 return string(buf, end, ip4_addr, spec);
1146 }
1147
1148 static noinline_for_stack
1149 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1150 struct printf_spec spec, const char *fmt)
1151 {
1152 bool have_p = false, have_s = false, have_f = false, have_c = false;
1153 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1154 sizeof(":12345") + sizeof("/123456789") +
1155 sizeof("%1234567890")];
1156 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1157 const u8 *addr = (const u8 *) &sa->sin6_addr;
1158 char fmt6[2] = { fmt[0], '6' };
1159 u8 off = 0;
1160
1161 fmt++;
1162 while (isalpha(*++fmt)) {
1163 switch (*fmt) {
1164 case 'p':
1165 have_p = true;
1166 break;
1167 case 'f':
1168 have_f = true;
1169 break;
1170 case 's':
1171 have_s = true;
1172 break;
1173 case 'c':
1174 have_c = true;
1175 break;
1176 }
1177 }
1178
1179 if (have_p || have_s || have_f) {
1180 *p = '[';
1181 off = 1;
1182 }
1183
1184 if (fmt6[0] == 'I' && have_c)
1185 p = ip6_compressed_string(ip6_addr + off, addr);
1186 else
1187 p = ip6_string(ip6_addr + off, addr, fmt6);
1188
1189 if (have_p || have_s || have_f)
1190 *p++ = ']';
1191
1192 if (have_p) {
1193 *p++ = ':';
1194 p = number(p, pend, ntohs(sa->sin6_port), spec);
1195 }
1196 if (have_f) {
1197 *p++ = '/';
1198 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1199 IPV6_FLOWINFO_MASK), spec);
1200 }
1201 if (have_s) {
1202 *p++ = '%';
1203 p = number(p, pend, sa->sin6_scope_id, spec);
1204 }
1205 *p = '\0';
1206
1207 return string(buf, end, ip6_addr, spec);
1208 }
1209
1210 static noinline_for_stack
1211 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1212 struct printf_spec spec, const char *fmt)
1213 {
1214 bool have_p = false;
1215 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1216 char *pend = ip4_addr + sizeof(ip4_addr);
1217 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1218 char fmt4[3] = { fmt[0], '4', 0 };
1219
1220 fmt++;
1221 while (isalpha(*++fmt)) {
1222 switch (*fmt) {
1223 case 'p':
1224 have_p = true;
1225 break;
1226 case 'h':
1227 case 'l':
1228 case 'n':
1229 case 'b':
1230 fmt4[2] = *fmt;
1231 break;
1232 }
1233 }
1234
1235 p = ip4_string(ip4_addr, addr, fmt4);
1236 if (have_p) {
1237 *p++ = ':';
1238 p = number(p, pend, ntohs(sa->sin_port), spec);
1239 }
1240 *p = '\0';
1241
1242 return string(buf, end, ip4_addr, spec);
1243 }
1244
1245 static noinline_for_stack
1246 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1247 const char *fmt)
1248 {
1249 bool found = true;
1250 int count = 1;
1251 unsigned int flags = 0;
1252 int len;
1253
1254 if (spec.field_width == 0)
1255 return buf; /* nothing to print */
1256
1257 if (ZERO_OR_NULL_PTR(addr))
1258 return string(buf, end, NULL, spec); /* NULL pointer */
1259
1260
1261 do {
1262 switch (fmt[count++]) {
1263 case 'a':
1264 flags |= ESCAPE_ANY;
1265 break;
1266 case 'c':
1267 flags |= ESCAPE_SPECIAL;
1268 break;
1269 case 'h':
1270 flags |= ESCAPE_HEX;
1271 break;
1272 case 'n':
1273 flags |= ESCAPE_NULL;
1274 break;
1275 case 'o':
1276 flags |= ESCAPE_OCTAL;
1277 break;
1278 case 'p':
1279 flags |= ESCAPE_NP;
1280 break;
1281 case 's':
1282 flags |= ESCAPE_SPACE;
1283 break;
1284 default:
1285 found = false;
1286 break;
1287 }
1288 } while (found);
1289
1290 if (!flags)
1291 flags = ESCAPE_ANY_NP;
1292
1293 len = spec.field_width < 0 ? 1 : spec.field_width;
1294
1295 /*
1296 * string_escape_mem() writes as many characters as it can to
1297 * the given buffer, and returns the total size of the output
1298 * had the buffer been big enough.
1299 */
1300 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1301
1302 return buf;
1303 }
1304
1305 static noinline_for_stack
1306 char *uuid_string(char *buf, char *end, const u8 *addr,
1307 struct printf_spec spec, const char *fmt)
1308 {
1309 char uuid[UUID_STRING_LEN + 1];
1310 char *p = uuid;
1311 int i;
1312 const u8 *index = uuid_index;
1313 bool uc = false;
1314
1315 switch (*(++fmt)) {
1316 case 'L':
1317 uc = true; /* fall-through */
1318 case 'l':
1319 index = guid_index;
1320 break;
1321 case 'B':
1322 uc = true;
1323 break;
1324 }
1325
1326 for (i = 0; i < 16; i++) {
1327 if (uc)
1328 p = hex_byte_pack_upper(p, addr[index[i]]);
1329 else
1330 p = hex_byte_pack(p, addr[index[i]]);
1331 switch (i) {
1332 case 3:
1333 case 5:
1334 case 7:
1335 case 9:
1336 *p++ = '-';
1337 break;
1338 }
1339 }
1340
1341 *p = 0;
1342
1343 return string(buf, end, uuid, spec);
1344 }
1345
1346 static noinline_for_stack
1347 char *netdev_bits(char *buf, char *end, const void *addr, const char *fmt)
1348 {
1349 unsigned long long num;
1350 int size;
1351
1352 switch (fmt[1]) {
1353 case 'F':
1354 num = *(const netdev_features_t *)addr;
1355 size = sizeof(netdev_features_t);
1356 break;
1357 default:
1358 num = (unsigned long)addr;
1359 size = sizeof(unsigned long);
1360 break;
1361 }
1362
1363 return special_hex_number(buf, end, num, size);
1364 }
1365
1366 static noinline_for_stack
1367 char *address_val(char *buf, char *end, const void *addr, const char *fmt)
1368 {
1369 unsigned long long num;
1370 int size;
1371
1372 switch (fmt[1]) {
1373 case 'd':
1374 num = *(const dma_addr_t *)addr;
1375 size = sizeof(dma_addr_t);
1376 break;
1377 case 'p':
1378 default:
1379 num = *(const phys_addr_t *)addr;
1380 size = sizeof(phys_addr_t);
1381 break;
1382 }
1383
1384 return special_hex_number(buf, end, num, size);
1385 }
1386
1387 static noinline_for_stack
1388 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1389 const char *fmt)
1390 {
1391 if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
1392 return string(buf, end, NULL, spec);
1393
1394 switch (fmt[1]) {
1395 case 'r':
1396 return number(buf, end, clk_get_rate(clk), spec);
1397
1398 case 'n':
1399 default:
1400 #ifdef CONFIG_COMMON_CLK
1401 return string(buf, end, __clk_get_name(clk), spec);
1402 #else
1403 return special_hex_number(buf, end, (unsigned long)clk, sizeof(unsigned long));
1404 #endif
1405 }
1406 }
1407
1408 static
1409 char *format_flags(char *buf, char *end, unsigned long flags,
1410 const struct trace_print_flags *names)
1411 {
1412 unsigned long mask;
1413 const struct printf_spec strspec = {
1414 .field_width = -1,
1415 .precision = -1,
1416 };
1417 const struct printf_spec numspec = {
1418 .flags = SPECIAL|SMALL,
1419 .field_width = -1,
1420 .precision = -1,
1421 .base = 16,
1422 };
1423
1424 for ( ; flags && names->name; names++) {
1425 mask = names->mask;
1426 if ((flags & mask) != mask)
1427 continue;
1428
1429 buf = string(buf, end, names->name, strspec);
1430
1431 flags &= ~mask;
1432 if (flags) {
1433 if (buf < end)
1434 *buf = '|';
1435 buf++;
1436 }
1437 }
1438
1439 if (flags)
1440 buf = number(buf, end, flags, numspec);
1441
1442 return buf;
1443 }
1444
1445 static noinline_for_stack
1446 char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
1447 {
1448 unsigned long flags;
1449 const struct trace_print_flags *names;
1450
1451 switch (fmt[1]) {
1452 case 'p':
1453 flags = *(unsigned long *)flags_ptr;
1454 /* Remove zone id */
1455 flags &= (1UL << NR_PAGEFLAGS) - 1;
1456 names = pageflag_names;
1457 break;
1458 case 'v':
1459 flags = *(unsigned long *)flags_ptr;
1460 names = vmaflag_names;
1461 break;
1462 case 'g':
1463 flags = *(gfp_t *)flags_ptr;
1464 names = gfpflag_names;
1465 break;
1466 default:
1467 WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]);
1468 return buf;
1469 }
1470
1471 return format_flags(buf, end, flags, names);
1472 }
1473
1474 static const char *device_node_name_for_depth(const struct device_node *np, int depth)
1475 {
1476 for ( ; np && depth; depth--)
1477 np = np->parent;
1478
1479 return kbasename(np->full_name);
1480 }
1481
1482 static noinline_for_stack
1483 char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
1484 {
1485 int depth;
1486 const struct device_node *parent = np->parent;
1487 static const struct printf_spec strspec = {
1488 .field_width = -1,
1489 .precision = -1,
1490 };
1491
1492 /* special case for root node */
1493 if (!parent)
1494 return string(buf, end, "/", strspec);
1495
1496 for (depth = 0; parent->parent; depth++)
1497 parent = parent->parent;
1498
1499 for ( ; depth >= 0; depth--) {
1500 buf = string(buf, end, "/", strspec);
1501 buf = string(buf, end, device_node_name_for_depth(np, depth),
1502 strspec);
1503 }
1504 return buf;
1505 }
1506
1507 static noinline_for_stack
1508 char *device_node_string(char *buf, char *end, struct device_node *dn,
1509 struct printf_spec spec, const char *fmt)
1510 {
1511 char tbuf[sizeof("xxxx") + 1];
1512 const char *p;
1513 int ret;
1514 char *buf_start = buf;
1515 struct property *prop;
1516 bool has_mult, pass;
1517 static const struct printf_spec num_spec = {
1518 .flags = SMALL,
1519 .field_width = -1,
1520 .precision = -1,
1521 .base = 10,
1522 };
1523
1524 struct printf_spec str_spec = spec;
1525 str_spec.field_width = -1;
1526
1527 if (!IS_ENABLED(CONFIG_OF))
1528 return string(buf, end, "(!OF)", spec);
1529
1530 if ((unsigned long)dn < PAGE_SIZE)
1531 return string(buf, end, "(null)", spec);
1532
1533 /* simple case without anything any more format specifiers */
1534 fmt++;
1535 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
1536 fmt = "f";
1537
1538 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
1539 if (pass) {
1540 if (buf < end)
1541 *buf = ':';
1542 buf++;
1543 }
1544
1545 switch (*fmt) {
1546 case 'f': /* full_name */
1547 buf = device_node_gen_full_name(dn, buf, end);
1548 break;
1549 case 'n': /* name */
1550 buf = string(buf, end, dn->name, str_spec);
1551 break;
1552 case 'p': /* phandle */
1553 buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
1554 break;
1555 case 'P': /* path-spec */
1556 p = kbasename(of_node_full_name(dn));
1557 if (!p[1])
1558 p = "/";
1559 buf = string(buf, end, p, str_spec);
1560 break;
1561 case 'F': /* flags */
1562 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
1563 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
1564 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
1565 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
1566 tbuf[4] = 0;
1567 buf = string(buf, end, tbuf, str_spec);
1568 break;
1569 case 'c': /* major compatible string */
1570 ret = of_property_read_string(dn, "compatible", &p);
1571 if (!ret)
1572 buf = string(buf, end, p, str_spec);
1573 break;
1574 case 'C': /* full compatible string */
1575 has_mult = false;
1576 of_property_for_each_string(dn, "compatible", prop, p) {
1577 if (has_mult)
1578 buf = string(buf, end, ",", str_spec);
1579 buf = string(buf, end, "\"", str_spec);
1580 buf = string(buf, end, p, str_spec);
1581 buf = string(buf, end, "\"", str_spec);
1582
1583 has_mult = true;
1584 }
1585 break;
1586 default:
1587 break;
1588 }
1589 }
1590
1591 return widen_string(buf, buf - buf_start, end, spec);
1592 }
1593
1594 #ifdef CONFIG_KMSG_IDS
1595
1596 unsigned long long __jhash_string(const char *str);
1597
1598 static noinline_for_stack
1599 char *jhash_string(char *buf, char *end, const char *str, const char *fmt)
1600 {
1601 struct printf_spec spec;
1602 unsigned long long num;
1603
1604 num = __jhash_string(str);
1605
1606 spec.type = FORMAT_TYPE_PTR;
1607 spec.field_width = 6;
1608 spec.flags = SMALL | ZEROPAD;
1609 spec.base = 16;
1610 spec.precision = -1;
1611
1612 return number(buf, end, num, spec);
1613 }
1614
1615 #endif
1616
1617 int kptr_restrict __read_mostly;
1618
1619 /*
1620 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1621 * by an extra set of alphanumeric characters that are extended format
1622 * specifiers.
1623 *
1624 * Please update scripts/checkpatch.pl when adding/removing conversion
1625 * characters. (Search for "check for vsprintf extension").
1626 *
1627 * Right now we handle:
1628 *
1629 * - 'F' For symbolic function descriptor pointers with offset
1630 * - 'f' For simple symbolic function names without offset
1631 * - 'S' For symbolic direct pointers with offset
1632 * - 's' For symbolic direct pointers without offset
1633 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1634 * - 'B' For backtraced symbolic direct pointers with offset
1635 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1636 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1637 * - 'b[l]' For a bitmap, the number of bits is determined by the field
1638 * width which must be explicitly specified either as part of the
1639 * format string '%32b[l]' or through '%*b[l]', [l] selects
1640 * range-list format instead of hex format
1641 * - 'M' For a 6-byte MAC address, it prints the address in the
1642 * usual colon-separated hex notation
1643 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1644 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1645 * with a dash-separated hex notation
1646 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1647 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1648 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1649 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1650 * [S][pfs]
1651 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1652 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1653 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1654 * IPv6 omits the colons (01020304...0f)
1655 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1656 * [S][pfs]
1657 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1658 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1659 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1660 * - 'I[6S]c' for IPv6 addresses printed as specified by
1661 * http://tools.ietf.org/html/rfc5952
1662 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
1663 * of the following flags (see string_escape_mem() for the
1664 * details):
1665 * a - ESCAPE_ANY
1666 * c - ESCAPE_SPECIAL
1667 * h - ESCAPE_HEX
1668 * n - ESCAPE_NULL
1669 * o - ESCAPE_OCTAL
1670 * p - ESCAPE_NP
1671 * s - ESCAPE_SPACE
1672 * By default ESCAPE_ANY_NP is used.
1673 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1674 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1675 * Options for %pU are:
1676 * b big endian lower case hex (default)
1677 * B big endian UPPER case hex
1678 * l little endian lower case hex
1679 * L little endian UPPER case hex
1680 * big endian output byte order is:
1681 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1682 * little endian output byte order is:
1683 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1684 * - 'V' For a struct va_format which contains a format string * and va_list *,
1685 * call vsnprintf(->format, *->va_list).
1686 * Implements a "recursive vsnprintf".
1687 * Do not use this feature without some mechanism to verify the
1688 * correctness of the format string and va_list arguments.
1689 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1690 * - 'NF' For a netdev_features_t
1691 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1692 * a certain separator (' ' by default):
1693 * C colon
1694 * D dash
1695 * N no separator
1696 * The maximum supported length is 64 bytes of the input. Consider
1697 * to use print_hex_dump() for the larger input.
1698 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
1699 * (default assumed to be phys_addr_t, passed by reference)
1700 * - 'd[234]' For a dentry name (optionally 2-4 last components)
1701 * - 'D[234]' Same as 'd' but for a struct file
1702 * - 'g' For block_device name (gendisk + partition number)
1703 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
1704 * (legacy clock framework) of the clock
1705 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
1706 * (legacy clock framework) of the clock
1707 * - 'Cr' For a clock, it prints the current rate of the clock
1708 * - 'G' For flags to be printed as a collection of symbolic strings that would
1709 * construct the specific value. Supported flags given by option:
1710 * p page flags (see struct page) given as pointer to unsigned long
1711 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
1712 * v vma flags (VM_*) given as pointer to unsigned long
1713 * - 'j' Kernel message catalog jhash for System z
1714 * - 'O' For a kobject based struct. Must be one of the following:
1715 * - 'OF[fnpPcCF]' For a device tree object
1716 * Without any optional arguments prints the full_name
1717 * f device node full_name
1718 * n device node name
1719 * p device node phandle
1720 * P device node path spec (name + @unit)
1721 * F device node flags
1722 * c major compatible string
1723 * C full compatible string
1724 *
1725 * ** Please update also Documentation/printk-formats.txt when making changes **
1726 *
1727 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1728 * function pointers are really function descriptors, which contain a
1729 * pointer to the real address.
1730 */
1731 static noinline_for_stack
1732 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
1733 struct printf_spec spec)
1734 {
1735 const int default_width = 2 * sizeof(void *);
1736
1737 if (!ptr && *fmt != 'K') {
1738 /*
1739 * Print (null) with the same width as a pointer so it makes
1740 * tabular output look nice.
1741 */
1742 if (spec.field_width == -1)
1743 spec.field_width = default_width;
1744 return string(buf, end, "(null)", spec);
1745 }
1746
1747 switch (*fmt) {
1748 case 'F':
1749 case 'f':
1750 ptr = dereference_function_descriptor(ptr);
1751 /* Fallthrough */
1752 case 'S':
1753 case 's':
1754 case 'B':
1755 return symbol_string(buf, end, ptr, spec, fmt);
1756 case 'R':
1757 case 'r':
1758 return resource_string(buf, end, ptr, spec, fmt);
1759 case 'h':
1760 return hex_string(buf, end, ptr, spec, fmt);
1761 case 'b':
1762 switch (fmt[1]) {
1763 case 'l':
1764 return bitmap_list_string(buf, end, ptr, spec, fmt);
1765 default:
1766 return bitmap_string(buf, end, ptr, spec, fmt);
1767 }
1768 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1769 case 'm': /* Contiguous: 000102030405 */
1770 /* [mM]F (FDDI) */
1771 /* [mM]R (Reverse order; Bluetooth) */
1772 return mac_address_string(buf, end, ptr, spec, fmt);
1773 case 'I': /* Formatted IP supported
1774 * 4: 1.2.3.4
1775 * 6: 0001:0203:...:0708
1776 * 6c: 1::708 or 1::1.2.3.4
1777 */
1778 case 'i': /* Contiguous:
1779 * 4: 001.002.003.004
1780 * 6: 000102...0f
1781 */
1782 switch (fmt[1]) {
1783 case '6':
1784 return ip6_addr_string(buf, end, ptr, spec, fmt);
1785 case '4':
1786 return ip4_addr_string(buf, end, ptr, spec, fmt);
1787 case 'S': {
1788 const union {
1789 struct sockaddr raw;
1790 struct sockaddr_in v4;
1791 struct sockaddr_in6 v6;
1792 } *sa = ptr;
1793
1794 switch (sa->raw.sa_family) {
1795 case AF_INET:
1796 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1797 case AF_INET6:
1798 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1799 default:
1800 return string(buf, end, "(invalid address)", spec);
1801 }}
1802 }
1803 break;
1804 case 'E':
1805 return escaped_string(buf, end, ptr, spec, fmt);
1806 case 'U':
1807 return uuid_string(buf, end, ptr, spec, fmt);
1808 case 'V':
1809 {
1810 va_list va;
1811
1812 va_copy(va, *((struct va_format *)ptr)->va);
1813 buf += vsnprintf(buf, end > buf ? end - buf : 0,
1814 ((struct va_format *)ptr)->fmt, va);
1815 va_end(va);
1816 return buf;
1817 }
1818 case 'K':
1819 switch (kptr_restrict) {
1820 case 0:
1821 /* Always print %pK values */
1822 break;
1823 case 1: {
1824 const struct cred *cred;
1825
1826 /*
1827 * kptr_restrict==1 cannot be used in IRQ context
1828 * because its test for CAP_SYSLOG would be meaningless.
1829 */
1830 if (in_irq() || in_serving_softirq() || in_nmi()) {
1831 if (spec.field_width == -1)
1832 spec.field_width = default_width;
1833 return string(buf, end, "pK-error", spec);
1834 }
1835
1836 /*
1837 * Only print the real pointer value if the current
1838 * process has CAP_SYSLOG and is running with the
1839 * same credentials it started with. This is because
1840 * access to files is checked at open() time, but %pK
1841 * checks permission at read() time. We don't want to
1842 * leak pointer values if a binary opens a file using
1843 * %pK and then elevates privileges before reading it.
1844 */
1845 cred = current_cred();
1846 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
1847 !uid_eq(cred->euid, cred->uid) ||
1848 !gid_eq(cred->egid, cred->gid))
1849 ptr = NULL;
1850 break;
1851 }
1852 case 2:
1853 default:
1854 /* Always print 0's for %pK */
1855 ptr = NULL;
1856 break;
1857 }
1858 break;
1859
1860 case 'N':
1861 return netdev_bits(buf, end, ptr, fmt);
1862 case 'a':
1863 return address_val(buf, end, ptr, fmt);
1864 case 'd':
1865 return dentry_name(buf, end, ptr, spec, fmt);
1866 case 'C':
1867 return clock(buf, end, ptr, spec, fmt);
1868 case 'D':
1869 return dentry_name(buf, end,
1870 ((const struct file *)ptr)->f_path.dentry,
1871 spec, fmt);
1872 #ifdef CONFIG_BLOCK
1873 case 'g':
1874 return bdev_name(buf, end, ptr, spec, fmt);
1875 #endif
1876
1877 case 'G':
1878 return flags_string(buf, end, ptr, fmt);
1879 case 'O':
1880 switch (fmt[1]) {
1881 case 'F':
1882 return device_node_string(buf, end, ptr, spec, fmt + 1);
1883 }
1884 #ifdef CONFIG_KMSG_IDS
1885 case 'j':
1886 return jhash_string(buf, end, ptr, fmt);
1887 #endif
1888 }
1889 spec.flags |= SMALL;
1890 if (spec.field_width == -1) {
1891 spec.field_width = default_width;
1892 spec.flags |= ZEROPAD;
1893 }
1894 spec.base = 16;
1895
1896 return number(buf, end, (unsigned long) ptr, spec);
1897 }
1898
1899 /*
1900 * Helper function to decode printf style format.
1901 * Each call decode a token from the format and return the
1902 * number of characters read (or likely the delta where it wants
1903 * to go on the next call).
1904 * The decoded token is returned through the parameters
1905 *
1906 * 'h', 'l', or 'L' for integer fields
1907 * 'z' support added 23/7/1999 S.H.
1908 * 'z' changed to 'Z' --davidm 1/25/99
1909 * 'Z' changed to 'z' --adobriyan 2017-01-25
1910 * 't' added for ptrdiff_t
1911 *
1912 * @fmt: the format string
1913 * @type of the token returned
1914 * @flags: various flags such as +, -, # tokens..
1915 * @field_width: overwritten width
1916 * @base: base of the number (octal, hex, ...)
1917 * @precision: precision of a number
1918 * @qualifier: qualifier of a number (long, size_t, ...)
1919 */
1920 static noinline_for_stack
1921 int format_decode(const char *fmt, struct printf_spec *spec)
1922 {
1923 const char *start = fmt;
1924 char qualifier;
1925
1926 /* we finished early by reading the field width */
1927 if (spec->type == FORMAT_TYPE_WIDTH) {
1928 if (spec->field_width < 0) {
1929 spec->field_width = -spec->field_width;
1930 spec->flags |= LEFT;
1931 }
1932 spec->type = FORMAT_TYPE_NONE;
1933 goto precision;
1934 }
1935
1936 /* we finished early by reading the precision */
1937 if (spec->type == FORMAT_TYPE_PRECISION) {
1938 if (spec->precision < 0)
1939 spec->precision = 0;
1940
1941 spec->type = FORMAT_TYPE_NONE;
1942 goto qualifier;
1943 }
1944
1945 /* By default */
1946 spec->type = FORMAT_TYPE_NONE;
1947
1948 for (; *fmt ; ++fmt) {
1949 if (*fmt == '%')
1950 break;
1951 }
1952
1953 /* Return the current non-format string */
1954 if (fmt != start || !*fmt)
1955 return fmt - start;
1956
1957 /* Process flags */
1958 spec->flags = 0;
1959
1960 while (1) { /* this also skips first '%' */
1961 bool found = true;
1962
1963 ++fmt;
1964
1965 switch (*fmt) {
1966 case '-': spec->flags |= LEFT; break;
1967 case '+': spec->flags |= PLUS; break;
1968 case ' ': spec->flags |= SPACE; break;
1969 case '#': spec->flags |= SPECIAL; break;
1970 case '0': spec->flags |= ZEROPAD; break;
1971 default: found = false;
1972 }
1973
1974 if (!found)
1975 break;
1976 }
1977
1978 /* get field width */
1979 spec->field_width = -1;
1980
1981 if (isdigit(*fmt))
1982 spec->field_width = skip_atoi(&fmt);
1983 else if (*fmt == '*') {
1984 /* it's the next argument */
1985 spec->type = FORMAT_TYPE_WIDTH;
1986 return ++fmt - start;
1987 }
1988
1989 precision:
1990 /* get the precision */
1991 spec->precision = -1;
1992 if (*fmt == '.') {
1993 ++fmt;
1994 if (isdigit(*fmt)) {
1995 spec->precision = skip_atoi(&fmt);
1996 if (spec->precision < 0)
1997 spec->precision = 0;
1998 } else if (*fmt == '*') {
1999 /* it's the next argument */
2000 spec->type = FORMAT_TYPE_PRECISION;
2001 return ++fmt - start;
2002 }
2003 }
2004
2005 qualifier:
2006 /* get the conversion qualifier */
2007 qualifier = 0;
2008 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2009 *fmt == 'z' || *fmt == 't') {
2010 qualifier = *fmt++;
2011 if (unlikely(qualifier == *fmt)) {
2012 if (qualifier == 'l') {
2013 qualifier = 'L';
2014 ++fmt;
2015 } else if (qualifier == 'h') {
2016 qualifier = 'H';
2017 ++fmt;
2018 }
2019 }
2020 }
2021
2022 /* default base */
2023 spec->base = 10;
2024 switch (*fmt) {
2025 case 'c':
2026 spec->type = FORMAT_TYPE_CHAR;
2027 return ++fmt - start;
2028
2029 case 's':
2030 spec->type = FORMAT_TYPE_STR;
2031 return ++fmt - start;
2032
2033 case 'p':
2034 spec->type = FORMAT_TYPE_PTR;
2035 return ++fmt - start;
2036
2037 case '%':
2038 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2039 return ++fmt - start;
2040
2041 /* integer number formats - set up the flags and "break" */
2042 case 'o':
2043 spec->base = 8;
2044 break;
2045
2046 case 'x':
2047 spec->flags |= SMALL;
2048
2049 case 'X':
2050 spec->base = 16;
2051 break;
2052
2053 case 'd':
2054 case 'i':
2055 spec->flags |= SIGN;
2056 case 'u':
2057 break;
2058
2059 case 'n':
2060 /*
2061 * Since %n poses a greater security risk than
2062 * utility, treat it as any other invalid or
2063 * unsupported format specifier.
2064 */
2065 /* Fall-through */
2066
2067 default:
2068 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
2069 spec->type = FORMAT_TYPE_INVALID;
2070 return fmt - start;
2071 }
2072
2073 if (qualifier == 'L')
2074 spec->type = FORMAT_TYPE_LONG_LONG;
2075 else if (qualifier == 'l') {
2076 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2077 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
2078 } else if (qualifier == 'z') {
2079 spec->type = FORMAT_TYPE_SIZE_T;
2080 } else if (qualifier == 't') {
2081 spec->type = FORMAT_TYPE_PTRDIFF;
2082 } else if (qualifier == 'H') {
2083 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2084 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
2085 } else if (qualifier == 'h') {
2086 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2087 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
2088 } else {
2089 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2090 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
2091 }
2092
2093 return ++fmt - start;
2094 }
2095
2096 static void
2097 set_field_width(struct printf_spec *spec, int width)
2098 {
2099 spec->field_width = width;
2100 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2101 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2102 }
2103 }
2104
2105 static void
2106 set_precision(struct printf_spec *spec, int prec)
2107 {
2108 spec->precision = prec;
2109 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2110 spec->precision = clamp(prec, 0, PRECISION_MAX);
2111 }
2112 }
2113
2114 /**
2115 * vsnprintf - Format a string and place it in a buffer
2116 * @buf: The buffer to place the result into
2117 * @size: The size of the buffer, including the trailing null space
2118 * @fmt: The format string to use
2119 * @args: Arguments for the format string
2120 *
2121 * This function generally follows C99 vsnprintf, but has some
2122 * extensions and a few limitations:
2123 *
2124 * - ``%n`` is unsupported
2125 * - ``%p*`` is handled by pointer()
2126 *
2127 * See pointer() or Documentation/printk-formats.txt for more
2128 * extensive description.
2129 *
2130 * **Please update the documentation in both places when making changes**
2131 *
2132 * The return value is the number of characters which would
2133 * be generated for the given input, excluding the trailing
2134 * '\0', as per ISO C99. If you want to have the exact
2135 * number of characters written into @buf as return value
2136 * (not including the trailing '\0'), use vscnprintf(). If the
2137 * return is greater than or equal to @size, the resulting
2138 * string is truncated.
2139 *
2140 * If you're not already dealing with a va_list consider using snprintf().
2141 */
2142 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2143 {
2144 unsigned long long num;
2145 char *str, *end;
2146 struct printf_spec spec = {0};
2147
2148 /* Reject out-of-range values early. Large positive sizes are
2149 used for unknown buffer sizes. */
2150 if (WARN_ON_ONCE(size > INT_MAX))
2151 return 0;
2152
2153 str = buf;
2154 end = buf + size;
2155
2156 /* Make sure end is always >= buf */
2157 if (end < buf) {
2158 end = ((void *)-1);
2159 size = end - buf;
2160 }
2161
2162 while (*fmt) {
2163 const char *old_fmt = fmt;
2164 int read = format_decode(fmt, &spec);
2165
2166 fmt += read;
2167
2168 switch (spec.type) {
2169 case FORMAT_TYPE_NONE: {
2170 int copy = read;
2171 if (str < end) {
2172 if (copy > end - str)
2173 copy = end - str;
2174 memcpy(str, old_fmt, copy);
2175 }
2176 str += read;
2177 break;
2178 }
2179
2180 case FORMAT_TYPE_WIDTH:
2181 set_field_width(&spec, va_arg(args, int));
2182 break;
2183
2184 case FORMAT_TYPE_PRECISION:
2185 set_precision(&spec, va_arg(args, int));
2186 break;
2187
2188 case FORMAT_TYPE_CHAR: {
2189 char c;
2190
2191 if (!(spec.flags & LEFT)) {
2192 while (--spec.field_width > 0) {
2193 if (str < end)
2194 *str = ' ';
2195 ++str;
2196
2197 }
2198 }
2199 c = (unsigned char) va_arg(args, int);
2200 if (str < end)
2201 *str = c;
2202 ++str;
2203 while (--spec.field_width > 0) {
2204 if (str < end)
2205 *str = ' ';
2206 ++str;
2207 }
2208 break;
2209 }
2210
2211 case FORMAT_TYPE_STR:
2212 str = string(str, end, va_arg(args, char *), spec);
2213 break;
2214
2215 case FORMAT_TYPE_PTR:
2216 str = pointer(fmt, str, end, va_arg(args, void *),
2217 spec);
2218 while (isalnum(*fmt))
2219 fmt++;
2220 break;
2221
2222 case FORMAT_TYPE_PERCENT_CHAR:
2223 if (str < end)
2224 *str = '%';
2225 ++str;
2226 break;
2227
2228 case FORMAT_TYPE_INVALID:
2229 /*
2230 * Presumably the arguments passed gcc's type
2231 * checking, but there is no safe or sane way
2232 * for us to continue parsing the format and
2233 * fetching from the va_list; the remaining
2234 * specifiers and arguments would be out of
2235 * sync.
2236 */
2237 goto out;
2238
2239 default:
2240 switch (spec.type) {
2241 case FORMAT_TYPE_LONG_LONG:
2242 num = va_arg(args, long long);
2243 break;
2244 case FORMAT_TYPE_ULONG:
2245 num = va_arg(args, unsigned long);
2246 break;
2247 case FORMAT_TYPE_LONG:
2248 num = va_arg(args, long);
2249 break;
2250 case FORMAT_TYPE_SIZE_T:
2251 if (spec.flags & SIGN)
2252 num = va_arg(args, ssize_t);
2253 else
2254 num = va_arg(args, size_t);
2255 break;
2256 case FORMAT_TYPE_PTRDIFF:
2257 num = va_arg(args, ptrdiff_t);
2258 break;
2259 case FORMAT_TYPE_UBYTE:
2260 num = (unsigned char) va_arg(args, int);
2261 break;
2262 case FORMAT_TYPE_BYTE:
2263 num = (signed char) va_arg(args, int);
2264 break;
2265 case FORMAT_TYPE_USHORT:
2266 num = (unsigned short) va_arg(args, int);
2267 break;
2268 case FORMAT_TYPE_SHORT:
2269 num = (short) va_arg(args, int);
2270 break;
2271 case FORMAT_TYPE_INT:
2272 num = (int) va_arg(args, int);
2273 break;
2274 default:
2275 num = va_arg(args, unsigned int);
2276 }
2277
2278 str = number(str, end, num, spec);
2279 }
2280 }
2281
2282 out:
2283 if (size > 0) {
2284 if (str < end)
2285 *str = '\0';
2286 else
2287 end[-1] = '\0';
2288 }
2289
2290 /* the trailing null byte doesn't count towards the total */
2291 return str-buf;
2292
2293 }
2294 EXPORT_SYMBOL(vsnprintf);
2295
2296 /**
2297 * vscnprintf - Format a string and place it in a buffer
2298 * @buf: The buffer to place the result into
2299 * @size: The size of the buffer, including the trailing null space
2300 * @fmt: The format string to use
2301 * @args: Arguments for the format string
2302 *
2303 * The return value is the number of characters which have been written into
2304 * the @buf not including the trailing '\0'. If @size is == 0 the function
2305 * returns 0.
2306 *
2307 * If you're not already dealing with a va_list consider using scnprintf().
2308 *
2309 * See the vsnprintf() documentation for format string extensions over C99.
2310 */
2311 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2312 {
2313 int i;
2314
2315 i = vsnprintf(buf, size, fmt, args);
2316
2317 if (likely(i < size))
2318 return i;
2319 if (size != 0)
2320 return size - 1;
2321 return 0;
2322 }
2323 EXPORT_SYMBOL(vscnprintf);
2324
2325 /**
2326 * snprintf - Format a string and place it in a buffer
2327 * @buf: The buffer to place the result into
2328 * @size: The size of the buffer, including the trailing null space
2329 * @fmt: The format string to use
2330 * @...: Arguments for the format string
2331 *
2332 * The return value is the number of characters which would be
2333 * generated for the given input, excluding the trailing null,
2334 * as per ISO C99. If the return is greater than or equal to
2335 * @size, the resulting string is truncated.
2336 *
2337 * See the vsnprintf() documentation for format string extensions over C99.
2338 */
2339 int snprintf(char *buf, size_t size, const char *fmt, ...)
2340 {
2341 va_list args;
2342 int i;
2343
2344 va_start(args, fmt);
2345 i = vsnprintf(buf, size, fmt, args);
2346 va_end(args);
2347
2348 return i;
2349 }
2350 EXPORT_SYMBOL(snprintf);
2351
2352 /**
2353 * scnprintf - Format a string and place it in a buffer
2354 * @buf: The buffer to place the result into
2355 * @size: The size of the buffer, including the trailing null space
2356 * @fmt: The format string to use
2357 * @...: Arguments for the format string
2358 *
2359 * The return value is the number of characters written into @buf not including
2360 * the trailing '\0'. If @size is == 0 the function returns 0.
2361 */
2362
2363 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2364 {
2365 va_list args;
2366 int i;
2367
2368 va_start(args, fmt);
2369 i = vscnprintf(buf, size, fmt, args);
2370 va_end(args);
2371
2372 return i;
2373 }
2374 EXPORT_SYMBOL(scnprintf);
2375
2376 /**
2377 * vsprintf - Format a string and place it in a buffer
2378 * @buf: The buffer to place the result into
2379 * @fmt: The format string to use
2380 * @args: Arguments for the format string
2381 *
2382 * The function returns the number of characters written
2383 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2384 * buffer overflows.
2385 *
2386 * If you're not already dealing with a va_list consider using sprintf().
2387 *
2388 * See the vsnprintf() documentation for format string extensions over C99.
2389 */
2390 int vsprintf(char *buf, const char *fmt, va_list args)
2391 {
2392 return vsnprintf(buf, INT_MAX, fmt, args);
2393 }
2394 EXPORT_SYMBOL(vsprintf);
2395
2396 /**
2397 * sprintf - Format a string and place it in a buffer
2398 * @buf: The buffer to place the result into
2399 * @fmt: The format string to use
2400 * @...: Arguments for the format string
2401 *
2402 * The function returns the number of characters written
2403 * into @buf. Use snprintf() or scnprintf() in order to avoid
2404 * buffer overflows.
2405 *
2406 * See the vsnprintf() documentation for format string extensions over C99.
2407 */
2408 int sprintf(char *buf, const char *fmt, ...)
2409 {
2410 va_list args;
2411 int i;
2412
2413 va_start(args, fmt);
2414 i = vsnprintf(buf, INT_MAX, fmt, args);
2415 va_end(args);
2416
2417 return i;
2418 }
2419 EXPORT_SYMBOL(sprintf);
2420
2421 #ifdef CONFIG_BINARY_PRINTF
2422 /*
2423 * bprintf service:
2424 * vbin_printf() - VA arguments to binary data
2425 * bstr_printf() - Binary data to text string
2426 */
2427
2428 /**
2429 * vbin_printf - Parse a format string and place args' binary value in a buffer
2430 * @bin_buf: The buffer to place args' binary value
2431 * @size: The size of the buffer(by words(32bits), not characters)
2432 * @fmt: The format string to use
2433 * @args: Arguments for the format string
2434 *
2435 * The format follows C99 vsnprintf, except %n is ignored, and its argument
2436 * is skipped.
2437 *
2438 * The return value is the number of words(32bits) which would be generated for
2439 * the given input.
2440 *
2441 * NOTE:
2442 * If the return value is greater than @size, the resulting bin_buf is NOT
2443 * valid for bstr_printf().
2444 */
2445 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
2446 {
2447 struct printf_spec spec = {0};
2448 char *str, *end;
2449
2450 str = (char *)bin_buf;
2451 end = (char *)(bin_buf + size);
2452
2453 #define save_arg(type) \
2454 do { \
2455 if (sizeof(type) == 8) { \
2456 unsigned long long value; \
2457 str = PTR_ALIGN(str, sizeof(u32)); \
2458 value = va_arg(args, unsigned long long); \
2459 if (str + sizeof(type) <= end) { \
2460 *(u32 *)str = *(u32 *)&value; \
2461 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
2462 } \
2463 } else { \
2464 unsigned long value; \
2465 str = PTR_ALIGN(str, sizeof(type)); \
2466 value = va_arg(args, int); \
2467 if (str + sizeof(type) <= end) \
2468 *(typeof(type) *)str = (type)value; \
2469 } \
2470 str += sizeof(type); \
2471 } while (0)
2472
2473 while (*fmt) {
2474 int read = format_decode(fmt, &spec);
2475
2476 fmt += read;
2477
2478 switch (spec.type) {
2479 case FORMAT_TYPE_NONE:
2480 case FORMAT_TYPE_PERCENT_CHAR:
2481 break;
2482 case FORMAT_TYPE_INVALID:
2483 goto out;
2484
2485 case FORMAT_TYPE_WIDTH:
2486 case FORMAT_TYPE_PRECISION:
2487 save_arg(int);
2488 break;
2489
2490 case FORMAT_TYPE_CHAR:
2491 save_arg(char);
2492 break;
2493
2494 case FORMAT_TYPE_STR: {
2495 const char *save_str = va_arg(args, char *);
2496 size_t len;
2497
2498 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
2499 || (unsigned long)save_str < PAGE_SIZE)
2500 save_str = "(null)";
2501 len = strlen(save_str) + 1;
2502 if (str + len < end)
2503 memcpy(str, save_str, len);
2504 str += len;
2505 break;
2506 }
2507
2508 case FORMAT_TYPE_PTR:
2509 save_arg(void *);
2510 /* skip all alphanumeric pointer suffixes */
2511 while (isalnum(*fmt))
2512 fmt++;
2513 break;
2514
2515 default:
2516 switch (spec.type) {
2517
2518 case FORMAT_TYPE_LONG_LONG:
2519 save_arg(long long);
2520 break;
2521 case FORMAT_TYPE_ULONG:
2522 case FORMAT_TYPE_LONG:
2523 save_arg(unsigned long);
2524 break;
2525 case FORMAT_TYPE_SIZE_T:
2526 save_arg(size_t);
2527 break;
2528 case FORMAT_TYPE_PTRDIFF:
2529 save_arg(ptrdiff_t);
2530 break;
2531 case FORMAT_TYPE_UBYTE:
2532 case FORMAT_TYPE_BYTE:
2533 save_arg(char);
2534 break;
2535 case FORMAT_TYPE_USHORT:
2536 case FORMAT_TYPE_SHORT:
2537 save_arg(short);
2538 break;
2539 default:
2540 save_arg(int);
2541 }
2542 }
2543 }
2544
2545 out:
2546 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
2547 #undef save_arg
2548 }
2549 EXPORT_SYMBOL_GPL(vbin_printf);
2550
2551 /**
2552 * bstr_printf - Format a string from binary arguments and place it in a buffer
2553 * @buf: The buffer to place the result into
2554 * @size: The size of the buffer, including the trailing null space
2555 * @fmt: The format string to use
2556 * @bin_buf: Binary arguments for the format string
2557 *
2558 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2559 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2560 * a binary buffer that generated by vbin_printf.
2561 *
2562 * The format follows C99 vsnprintf, but has some extensions:
2563 * see vsnprintf comment for details.
2564 *
2565 * The return value is the number of characters which would
2566 * be generated for the given input, excluding the trailing
2567 * '\0', as per ISO C99. If you want to have the exact
2568 * number of characters written into @buf as return value
2569 * (not including the trailing '\0'), use vscnprintf(). If the
2570 * return is greater than or equal to @size, the resulting
2571 * string is truncated.
2572 */
2573 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2574 {
2575 struct printf_spec spec = {0};
2576 char *str, *end;
2577 const char *args = (const char *)bin_buf;
2578
2579 if (WARN_ON_ONCE(size > INT_MAX))
2580 return 0;
2581
2582 str = buf;
2583 end = buf + size;
2584
2585 #define get_arg(type) \
2586 ({ \
2587 typeof(type) value; \
2588 if (sizeof(type) == 8) { \
2589 args = PTR_ALIGN(args, sizeof(u32)); \
2590 *(u32 *)&value = *(u32 *)args; \
2591 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2592 } else { \
2593 args = PTR_ALIGN(args, sizeof(type)); \
2594 value = *(typeof(type) *)args; \
2595 } \
2596 args += sizeof(type); \
2597 value; \
2598 })
2599
2600 /* Make sure end is always >= buf */
2601 if (end < buf) {
2602 end = ((void *)-1);
2603 size = end - buf;
2604 }
2605
2606 while (*fmt) {
2607 const char *old_fmt = fmt;
2608 int read = format_decode(fmt, &spec);
2609
2610 fmt += read;
2611
2612 switch (spec.type) {
2613 case FORMAT_TYPE_NONE: {
2614 int copy = read;
2615 if (str < end) {
2616 if (copy > end - str)
2617 copy = end - str;
2618 memcpy(str, old_fmt, copy);
2619 }
2620 str += read;
2621 break;
2622 }
2623
2624 case FORMAT_TYPE_WIDTH:
2625 set_field_width(&spec, get_arg(int));
2626 break;
2627
2628 case FORMAT_TYPE_PRECISION:
2629 set_precision(&spec, get_arg(int));
2630 break;
2631
2632 case FORMAT_TYPE_CHAR: {
2633 char c;
2634
2635 if (!(spec.flags & LEFT)) {
2636 while (--spec.field_width > 0) {
2637 if (str < end)
2638 *str = ' ';
2639 ++str;
2640 }
2641 }
2642 c = (unsigned char) get_arg(char);
2643 if (str < end)
2644 *str = c;
2645 ++str;
2646 while (--spec.field_width > 0) {
2647 if (str < end)
2648 *str = ' ';
2649 ++str;
2650 }
2651 break;
2652 }
2653
2654 case FORMAT_TYPE_STR: {
2655 const char *str_arg = args;
2656 args += strlen(str_arg) + 1;
2657 str = string(str, end, (char *)str_arg, spec);
2658 break;
2659 }
2660
2661 case FORMAT_TYPE_PTR:
2662 str = pointer(fmt, str, end, get_arg(void *), spec);
2663 while (isalnum(*fmt))
2664 fmt++;
2665 break;
2666
2667 case FORMAT_TYPE_PERCENT_CHAR:
2668 if (str < end)
2669 *str = '%';
2670 ++str;
2671 break;
2672
2673 case FORMAT_TYPE_INVALID:
2674 goto out;
2675
2676 default: {
2677 unsigned long long num;
2678
2679 switch (spec.type) {
2680
2681 case FORMAT_TYPE_LONG_LONG:
2682 num = get_arg(long long);
2683 break;
2684 case FORMAT_TYPE_ULONG:
2685 case FORMAT_TYPE_LONG:
2686 num = get_arg(unsigned long);
2687 break;
2688 case FORMAT_TYPE_SIZE_T:
2689 num = get_arg(size_t);
2690 break;
2691 case FORMAT_TYPE_PTRDIFF:
2692 num = get_arg(ptrdiff_t);
2693 break;
2694 case FORMAT_TYPE_UBYTE:
2695 num = get_arg(unsigned char);
2696 break;
2697 case FORMAT_TYPE_BYTE:
2698 num = get_arg(signed char);
2699 break;
2700 case FORMAT_TYPE_USHORT:
2701 num = get_arg(unsigned short);
2702 break;
2703 case FORMAT_TYPE_SHORT:
2704 num = get_arg(short);
2705 break;
2706 case FORMAT_TYPE_UINT:
2707 num = get_arg(unsigned int);
2708 break;
2709 default:
2710 num = get_arg(int);
2711 }
2712
2713 str = number(str, end, num, spec);
2714 } /* default: */
2715 } /* switch(spec.type) */
2716 } /* while(*fmt) */
2717
2718 out:
2719 if (size > 0) {
2720 if (str < end)
2721 *str = '\0';
2722 else
2723 end[-1] = '\0';
2724 }
2725
2726 #undef get_arg
2727
2728 /* the trailing null byte doesn't count towards the total */
2729 return str - buf;
2730 }
2731 EXPORT_SYMBOL_GPL(bstr_printf);
2732
2733 /**
2734 * bprintf - Parse a format string and place args' binary value in a buffer
2735 * @bin_buf: The buffer to place args' binary value
2736 * @size: The size of the buffer(by words(32bits), not characters)
2737 * @fmt: The format string to use
2738 * @...: Arguments for the format string
2739 *
2740 * The function returns the number of words(u32) written
2741 * into @bin_buf.
2742 */
2743 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
2744 {
2745 va_list args;
2746 int ret;
2747
2748 va_start(args, fmt);
2749 ret = vbin_printf(bin_buf, size, fmt, args);
2750 va_end(args);
2751
2752 return ret;
2753 }
2754 EXPORT_SYMBOL_GPL(bprintf);
2755
2756 #endif /* CONFIG_BINARY_PRINTF */
2757
2758 /**
2759 * vsscanf - Unformat a buffer into a list of arguments
2760 * @buf: input buffer
2761 * @fmt: format of buffer
2762 * @args: arguments
2763 */
2764 int vsscanf(const char *buf, const char *fmt, va_list args)
2765 {
2766 const char *str = buf;
2767 char *next;
2768 char digit;
2769 int num = 0;
2770 u8 qualifier;
2771 unsigned int base;
2772 union {
2773 long long s;
2774 unsigned long long u;
2775 } val;
2776 s16 field_width;
2777 bool is_sign;
2778
2779 while (*fmt) {
2780 /* skip any white space in format */
2781 /* white space in format matchs any amount of
2782 * white space, including none, in the input.
2783 */
2784 if (isspace(*fmt)) {
2785 fmt = skip_spaces(++fmt);
2786 str = skip_spaces(str);
2787 }
2788
2789 /* anything that is not a conversion must match exactly */
2790 if (*fmt != '%' && *fmt) {
2791 if (*fmt++ != *str++)
2792 break;
2793 continue;
2794 }
2795
2796 if (!*fmt)
2797 break;
2798 ++fmt;
2799
2800 /* skip this conversion.
2801 * advance both strings to next white space
2802 */
2803 if (*fmt == '*') {
2804 if (!*str)
2805 break;
2806 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
2807 /* '%*[' not yet supported, invalid format */
2808 if (*fmt == '[')
2809 return num;
2810 fmt++;
2811 }
2812 while (!isspace(*str) && *str)
2813 str++;
2814 continue;
2815 }
2816
2817 /* get field width */
2818 field_width = -1;
2819 if (isdigit(*fmt)) {
2820 field_width = skip_atoi(&fmt);
2821 if (field_width <= 0)
2822 break;
2823 }
2824
2825 /* get conversion qualifier */
2826 qualifier = -1;
2827 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2828 *fmt == 'z') {
2829 qualifier = *fmt++;
2830 if (unlikely(qualifier == *fmt)) {
2831 if (qualifier == 'h') {
2832 qualifier = 'H';
2833 fmt++;
2834 } else if (qualifier == 'l') {
2835 qualifier = 'L';
2836 fmt++;
2837 }
2838 }
2839 }
2840
2841 if (!*fmt)
2842 break;
2843
2844 if (*fmt == 'n') {
2845 /* return number of characters read so far */
2846 *va_arg(args, int *) = str - buf;
2847 ++fmt;
2848 continue;
2849 }
2850
2851 if (!*str)
2852 break;
2853
2854 base = 10;
2855 is_sign = false;
2856
2857 switch (*fmt++) {
2858 case 'c':
2859 {
2860 char *s = (char *)va_arg(args, char*);
2861 if (field_width == -1)
2862 field_width = 1;
2863 do {
2864 *s++ = *str++;
2865 } while (--field_width > 0 && *str);
2866 num++;
2867 }
2868 continue;
2869 case 's':
2870 {
2871 char *s = (char *)va_arg(args, char *);
2872 if (field_width == -1)
2873 field_width = SHRT_MAX;
2874 /* first, skip leading white space in buffer */
2875 str = skip_spaces(str);
2876
2877 /* now copy until next white space */
2878 while (*str && !isspace(*str) && field_width--)
2879 *s++ = *str++;
2880 *s = '\0';
2881 num++;
2882 }
2883 continue;
2884 /*
2885 * Warning: This implementation of the '[' conversion specifier
2886 * deviates from its glibc counterpart in the following ways:
2887 * (1) It does NOT support ranges i.e. '-' is NOT a special
2888 * character
2889 * (2) It cannot match the closing bracket ']' itself
2890 * (3) A field width is required
2891 * (4) '%*[' (discard matching input) is currently not supported
2892 *
2893 * Example usage:
2894 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
2895 * buf1, buf2, buf3);
2896 * if (ret < 3)
2897 * // etc..
2898 */
2899 case '[':
2900 {
2901 char *s = (char *)va_arg(args, char *);
2902 DECLARE_BITMAP(set, 256) = {0};
2903 unsigned int len = 0;
2904 bool negate = (*fmt == '^');
2905
2906 /* field width is required */
2907 if (field_width == -1)
2908 return num;
2909
2910 if (negate)
2911 ++fmt;
2912
2913 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
2914 set_bit((u8)*fmt, set);
2915
2916 /* no ']' or no character set found */
2917 if (!*fmt || !len)
2918 return num;
2919 ++fmt;
2920
2921 if (negate) {
2922 bitmap_complement(set, set, 256);
2923 /* exclude null '\0' byte */
2924 clear_bit(0, set);
2925 }
2926
2927 /* match must be non-empty */
2928 if (!test_bit((u8)*str, set))
2929 return num;
2930
2931 while (test_bit((u8)*str, set) && field_width--)
2932 *s++ = *str++;
2933 *s = '\0';
2934 ++num;
2935 }
2936 continue;
2937 case 'o':
2938 base = 8;
2939 break;
2940 case 'x':
2941 case 'X':
2942 base = 16;
2943 break;
2944 case 'i':
2945 base = 0;
2946 case 'd':
2947 is_sign = true;
2948 case 'u':
2949 break;
2950 case '%':
2951 /* looking for '%' in str */
2952 if (*str++ != '%')
2953 return num;
2954 continue;
2955 default:
2956 /* invalid format; stop here */
2957 return num;
2958 }
2959
2960 /* have some sort of integer conversion.
2961 * first, skip white space in buffer.
2962 */
2963 str = skip_spaces(str);
2964
2965 digit = *str;
2966 if (is_sign && digit == '-')
2967 digit = *(str + 1);
2968
2969 if (!digit
2970 || (base == 16 && !isxdigit(digit))
2971 || (base == 10 && !isdigit(digit))
2972 || (base == 8 && (!isdigit(digit) || digit > '7'))
2973 || (base == 0 && !isdigit(digit)))
2974 break;
2975
2976 if (is_sign)
2977 val.s = qualifier != 'L' ?
2978 simple_strtol(str, &next, base) :
2979 simple_strtoll(str, &next, base);
2980 else
2981 val.u = qualifier != 'L' ?
2982 simple_strtoul(str, &next, base) :
2983 simple_strtoull(str, &next, base);
2984
2985 if (field_width > 0 && next - str > field_width) {
2986 if (base == 0)
2987 _parse_integer_fixup_radix(str, &base);
2988 while (next - str > field_width) {
2989 if (is_sign)
2990 val.s = div_s64(val.s, base);
2991 else
2992 val.u = div_u64(val.u, base);
2993 --next;
2994 }
2995 }
2996
2997 switch (qualifier) {
2998 case 'H': /* that's 'hh' in format */
2999 if (is_sign)
3000 *va_arg(args, signed char *) = val.s;
3001 else
3002 *va_arg(args, unsigned char *) = val.u;
3003 break;
3004 case 'h':
3005 if (is_sign)
3006 *va_arg(args, short *) = val.s;
3007 else
3008 *va_arg(args, unsigned short *) = val.u;
3009 break;
3010 case 'l':
3011 if (is_sign)
3012 *va_arg(args, long *) = val.s;
3013 else
3014 *va_arg(args, unsigned long *) = val.u;
3015 break;
3016 case 'L':
3017 if (is_sign)
3018 *va_arg(args, long long *) = val.s;
3019 else
3020 *va_arg(args, unsigned long long *) = val.u;
3021 break;
3022 case 'z':
3023 *va_arg(args, size_t *) = val.u;
3024 break;
3025 default:
3026 if (is_sign)
3027 *va_arg(args, int *) = val.s;
3028 else
3029 *va_arg(args, unsigned int *) = val.u;
3030 break;
3031 }
3032 num++;
3033
3034 if (!next)
3035 break;
3036 str = next;
3037 }
3038
3039 return num;
3040 }
3041 EXPORT_SYMBOL(vsscanf);
3042
3043 /**
3044 * sscanf - Unformat a buffer into a list of arguments
3045 * @buf: input buffer
3046 * @fmt: formatting of buffer
3047 * @...: resulting arguments
3048 */
3049 int sscanf(const char *buf, const char *fmt, ...)
3050 {
3051 va_list args;
3052 int i;
3053
3054 va_start(args, fmt);
3055 i = vsscanf(buf, fmt, args);
3056 va_end(args);
3057
3058 return i;
3059 }
3060 EXPORT_SYMBOL(sscanf);
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