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Merge branch 'for-3.13/drivers' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / lib / vsprintf.c
1 /*
2 * linux/lib/vsprintf.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8 /*
9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
10 */
11
12 /*
13 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
14 * - changed to provide snprintf and vsnprintf functions
15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
16 * - scnprintf and vscnprintf
17 */
18
19 #include <stdarg.h>
20 #include <linux/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 <linux/dcache.h>
30 #include <linux/cred.h>
31 #include <net/addrconf.h>
32
33 #include <asm/page.h> /* for PAGE_SIZE */
34 #include <asm/sections.h> /* for dereference_function_descriptor() */
35
36 #include "kstrtox.h"
37
38 /**
39 * simple_strtoull - convert a string to an unsigned long long
40 * @cp: The start of the string
41 * @endp: A pointer to the end of the parsed string will be placed here
42 * @base: The number base to use
43 *
44 * This function is obsolete. Please use kstrtoull instead.
45 */
46 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
47 {
48 unsigned long long result;
49 unsigned int rv;
50
51 cp = _parse_integer_fixup_radix(cp, &base);
52 rv = _parse_integer(cp, base, &result);
53 /* FIXME */
54 cp += (rv & ~KSTRTOX_OVERFLOW);
55
56 if (endp)
57 *endp = (char *)cp;
58
59 return result;
60 }
61 EXPORT_SYMBOL(simple_strtoull);
62
63 /**
64 * simple_strtoul - convert a string to an unsigned long
65 * @cp: The start of the string
66 * @endp: A pointer to the end of the parsed string will be placed here
67 * @base: The number base to use
68 *
69 * This function is obsolete. Please use kstrtoul instead.
70 */
71 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
72 {
73 return simple_strtoull(cp, endp, base);
74 }
75 EXPORT_SYMBOL(simple_strtoul);
76
77 /**
78 * simple_strtol - convert a string to a signed long
79 * @cp: The start of the string
80 * @endp: A pointer to the end of the parsed string will be placed here
81 * @base: The number base to use
82 *
83 * This function is obsolete. Please use kstrtol instead.
84 */
85 long simple_strtol(const char *cp, char **endp, unsigned int base)
86 {
87 if (*cp == '-')
88 return -simple_strtoul(cp + 1, endp, base);
89
90 return simple_strtoul(cp, endp, base);
91 }
92 EXPORT_SYMBOL(simple_strtol);
93
94 /**
95 * simple_strtoll - convert a string to a signed long long
96 * @cp: The start of the string
97 * @endp: A pointer to the end of the parsed string will be placed here
98 * @base: The number base to use
99 *
100 * This function is obsolete. Please use kstrtoll instead.
101 */
102 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
103 {
104 if (*cp == '-')
105 return -simple_strtoull(cp + 1, endp, base);
106
107 return simple_strtoull(cp, endp, base);
108 }
109 EXPORT_SYMBOL(simple_strtoll);
110
111 static noinline_for_stack
112 int skip_atoi(const char **s)
113 {
114 int i = 0;
115
116 while (isdigit(**s))
117 i = i*10 + *((*s)++) - '0';
118
119 return i;
120 }
121
122 /* Decimal conversion is by far the most typical, and is used
123 * for /proc and /sys data. This directly impacts e.g. top performance
124 * with many processes running. We optimize it for speed
125 * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
126 * (with permission from the author, Douglas W. Jones).
127 */
128
129 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
130 /* Formats correctly any integer in [0, 999999999] */
131 static noinline_for_stack
132 char *put_dec_full9(char *buf, unsigned q)
133 {
134 unsigned r;
135
136 /*
137 * Possible ways to approx. divide by 10
138 * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit)
139 * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul)
140 * (x * 0x6667) >> 18 x < 43699
141 * (x * 0x3334) >> 17 x < 16389
142 * (x * 0x199a) >> 16 x < 16389
143 * (x * 0x0ccd) >> 15 x < 16389
144 * (x * 0x0667) >> 14 x < 2739
145 * (x * 0x0334) >> 13 x < 1029
146 * (x * 0x019a) >> 12 x < 1029
147 * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386)
148 * (x * 0x0067) >> 10 x < 179
149 * (x * 0x0034) >> 9 x < 69 same
150 * (x * 0x001a) >> 8 x < 69 same
151 * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386)
152 * (x * 0x0007) >> 6 x < 19
153 * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html>
154 */
155 r = (q * (uint64_t)0x1999999a) >> 32;
156 *buf++ = (q - 10 * r) + '0'; /* 1 */
157 q = (r * (uint64_t)0x1999999a) >> 32;
158 *buf++ = (r - 10 * q) + '0'; /* 2 */
159 r = (q * (uint64_t)0x1999999a) >> 32;
160 *buf++ = (q - 10 * r) + '0'; /* 3 */
161 q = (r * (uint64_t)0x1999999a) >> 32;
162 *buf++ = (r - 10 * q) + '0'; /* 4 */
163 r = (q * (uint64_t)0x1999999a) >> 32;
164 *buf++ = (q - 10 * r) + '0'; /* 5 */
165 /* Now value is under 10000, can avoid 64-bit multiply */
166 q = (r * 0x199a) >> 16;
167 *buf++ = (r - 10 * q) + '0'; /* 6 */
168 r = (q * 0xcd) >> 11;
169 *buf++ = (q - 10 * r) + '0'; /* 7 */
170 q = (r * 0xcd) >> 11;
171 *buf++ = (r - 10 * q) + '0'; /* 8 */
172 *buf++ = q + '0'; /* 9 */
173 return buf;
174 }
175 #endif
176
177 /* Similar to above but do not pad with zeros.
178 * Code can be easily arranged to print 9 digits too, but our callers
179 * always call put_dec_full9() instead when the number has 9 decimal digits.
180 */
181 static noinline_for_stack
182 char *put_dec_trunc8(char *buf, unsigned r)
183 {
184 unsigned q;
185
186 /* Copy of previous function's body with added early returns */
187 while (r >= 10000) {
188 q = r + '0';
189 r = (r * (uint64_t)0x1999999a) >> 32;
190 *buf++ = q - 10*r;
191 }
192
193 q = (r * 0x199a) >> 16; /* r <= 9999 */
194 *buf++ = (r - 10 * q) + '0';
195 if (q == 0)
196 return buf;
197 r = (q * 0xcd) >> 11; /* q <= 999 */
198 *buf++ = (q - 10 * r) + '0';
199 if (r == 0)
200 return buf;
201 q = (r * 0xcd) >> 11; /* r <= 99 */
202 *buf++ = (r - 10 * q) + '0';
203 if (q == 0)
204 return buf;
205 *buf++ = q + '0'; /* q <= 9 */
206 return buf;
207 }
208
209 /* There are two algorithms to print larger numbers.
210 * One is generic: divide by 1000000000 and repeatedly print
211 * groups of (up to) 9 digits. It's conceptually simple,
212 * but requires a (unsigned long long) / 1000000000 division.
213 *
214 * Second algorithm splits 64-bit unsigned long long into 16-bit chunks,
215 * manipulates them cleverly and generates groups of 4 decimal digits.
216 * It so happens that it does NOT require long long division.
217 *
218 * If long is > 32 bits, division of 64-bit values is relatively easy,
219 * and we will use the first algorithm.
220 * If long long is > 64 bits (strange architecture with VERY large long long),
221 * second algorithm can't be used, and we again use the first one.
222 *
223 * Else (if long is 32 bits and long long is 64 bits) we use second one.
224 */
225
226 #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64
227
228 /* First algorithm: generic */
229
230 static
231 char *put_dec(char *buf, unsigned long long n)
232 {
233 if (n >= 100*1000*1000) {
234 while (n >= 1000*1000*1000)
235 buf = put_dec_full9(buf, do_div(n, 1000*1000*1000));
236 if (n >= 100*1000*1000)
237 return put_dec_full9(buf, n);
238 }
239 return put_dec_trunc8(buf, n);
240 }
241
242 #else
243
244 /* Second algorithm: valid only for 64-bit long longs */
245
246 /* See comment in put_dec_full9 for choice of constants */
247 static noinline_for_stack
248 void put_dec_full4(char *buf, unsigned q)
249 {
250 unsigned r;
251 r = (q * 0xccd) >> 15;
252 buf[0] = (q - 10 * r) + '0';
253 q = (r * 0xcd) >> 11;
254 buf[1] = (r - 10 * q) + '0';
255 r = (q * 0xcd) >> 11;
256 buf[2] = (q - 10 * r) + '0';
257 buf[3] = r + '0';
258 }
259
260 /*
261 * Call put_dec_full4 on x % 10000, return x / 10000.
262 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
263 * holds for all x < 1,128,869,999. The largest value this
264 * helper will ever be asked to convert is 1,125,520,955.
265 * (d1 in the put_dec code, assuming n is all-ones).
266 */
267 static
268 unsigned put_dec_helper4(char *buf, unsigned x)
269 {
270 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
271
272 put_dec_full4(buf, x - q * 10000);
273 return q;
274 }
275
276 /* Based on code by Douglas W. Jones found at
277 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
278 * (with permission from the author).
279 * Performs no 64-bit division and hence should be fast on 32-bit machines.
280 */
281 static
282 char *put_dec(char *buf, unsigned long long n)
283 {
284 uint32_t d3, d2, d1, q, h;
285
286 if (n < 100*1000*1000)
287 return put_dec_trunc8(buf, n);
288
289 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
290 h = (n >> 32);
291 d2 = (h ) & 0xffff;
292 d3 = (h >> 16); /* implicit "& 0xffff" */
293
294 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
295 q = put_dec_helper4(buf, q);
296
297 q += 7671 * d3 + 9496 * d2 + 6 * d1;
298 q = put_dec_helper4(buf+4, q);
299
300 q += 4749 * d3 + 42 * d2;
301 q = put_dec_helper4(buf+8, q);
302
303 q += 281 * d3;
304 buf += 12;
305 if (q)
306 buf = put_dec_trunc8(buf, q);
307 else while (buf[-1] == '0')
308 --buf;
309
310 return buf;
311 }
312
313 #endif
314
315 /*
316 * Convert passed number to decimal string.
317 * Returns the length of string. On buffer overflow, returns 0.
318 *
319 * If speed is not important, use snprintf(). It's easy to read the code.
320 */
321 int num_to_str(char *buf, int size, unsigned long long num)
322 {
323 char tmp[sizeof(num) * 3];
324 int idx, len;
325
326 /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */
327 if (num <= 9) {
328 tmp[0] = '0' + num;
329 len = 1;
330 } else {
331 len = put_dec(tmp, num) - tmp;
332 }
333
334 if (len > size)
335 return 0;
336 for (idx = 0; idx < len; ++idx)
337 buf[idx] = tmp[len - idx - 1];
338 return len;
339 }
340
341 #define ZEROPAD 1 /* pad with zero */
342 #define SIGN 2 /* unsigned/signed long */
343 #define PLUS 4 /* show plus */
344 #define SPACE 8 /* space if plus */
345 #define LEFT 16 /* left justified */
346 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
347 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
348
349 enum format_type {
350 FORMAT_TYPE_NONE, /* Just a string part */
351 FORMAT_TYPE_WIDTH,
352 FORMAT_TYPE_PRECISION,
353 FORMAT_TYPE_CHAR,
354 FORMAT_TYPE_STR,
355 FORMAT_TYPE_PTR,
356 FORMAT_TYPE_PERCENT_CHAR,
357 FORMAT_TYPE_INVALID,
358 FORMAT_TYPE_LONG_LONG,
359 FORMAT_TYPE_ULONG,
360 FORMAT_TYPE_LONG,
361 FORMAT_TYPE_UBYTE,
362 FORMAT_TYPE_BYTE,
363 FORMAT_TYPE_USHORT,
364 FORMAT_TYPE_SHORT,
365 FORMAT_TYPE_UINT,
366 FORMAT_TYPE_INT,
367 FORMAT_TYPE_NRCHARS,
368 FORMAT_TYPE_SIZE_T,
369 FORMAT_TYPE_PTRDIFF
370 };
371
372 struct printf_spec {
373 u8 type; /* format_type enum */
374 u8 flags; /* flags to number() */
375 u8 base; /* number base, 8, 10 or 16 only */
376 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
377 s16 field_width; /* width of output field */
378 s16 precision; /* # of digits/chars */
379 };
380
381 static noinline_for_stack
382 char *number(char *buf, char *end, unsigned long long num,
383 struct printf_spec spec)
384 {
385 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
386 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
387
388 char tmp[66];
389 char sign;
390 char locase;
391 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
392 int i;
393 bool is_zero = num == 0LL;
394
395 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
396 * produces same digits or (maybe lowercased) letters */
397 locase = (spec.flags & SMALL);
398 if (spec.flags & LEFT)
399 spec.flags &= ~ZEROPAD;
400 sign = 0;
401 if (spec.flags & SIGN) {
402 if ((signed long long)num < 0) {
403 sign = '-';
404 num = -(signed long long)num;
405 spec.field_width--;
406 } else if (spec.flags & PLUS) {
407 sign = '+';
408 spec.field_width--;
409 } else if (spec.flags & SPACE) {
410 sign = ' ';
411 spec.field_width--;
412 }
413 }
414 if (need_pfx) {
415 if (spec.base == 16)
416 spec.field_width -= 2;
417 else if (!is_zero)
418 spec.field_width--;
419 }
420
421 /* generate full string in tmp[], in reverse order */
422 i = 0;
423 if (num < spec.base)
424 tmp[i++] = digits[num] | locase;
425 /* Generic code, for any base:
426 else do {
427 tmp[i++] = (digits[do_div(num,base)] | locase);
428 } while (num != 0);
429 */
430 else if (spec.base != 10) { /* 8 or 16 */
431 int mask = spec.base - 1;
432 int shift = 3;
433
434 if (spec.base == 16)
435 shift = 4;
436 do {
437 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
438 num >>= shift;
439 } while (num);
440 } else { /* base 10 */
441 i = put_dec(tmp, num) - tmp;
442 }
443
444 /* printing 100 using %2d gives "100", not "00" */
445 if (i > spec.precision)
446 spec.precision = i;
447 /* leading space padding */
448 spec.field_width -= spec.precision;
449 if (!(spec.flags & (ZEROPAD+LEFT))) {
450 while (--spec.field_width >= 0) {
451 if (buf < end)
452 *buf = ' ';
453 ++buf;
454 }
455 }
456 /* sign */
457 if (sign) {
458 if (buf < end)
459 *buf = sign;
460 ++buf;
461 }
462 /* "0x" / "0" prefix */
463 if (need_pfx) {
464 if (spec.base == 16 || !is_zero) {
465 if (buf < end)
466 *buf = '0';
467 ++buf;
468 }
469 if (spec.base == 16) {
470 if (buf < end)
471 *buf = ('X' | locase);
472 ++buf;
473 }
474 }
475 /* zero or space padding */
476 if (!(spec.flags & LEFT)) {
477 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
478 while (--spec.field_width >= 0) {
479 if (buf < end)
480 *buf = c;
481 ++buf;
482 }
483 }
484 /* hmm even more zero padding? */
485 while (i <= --spec.precision) {
486 if (buf < end)
487 *buf = '0';
488 ++buf;
489 }
490 /* actual digits of result */
491 while (--i >= 0) {
492 if (buf < end)
493 *buf = tmp[i];
494 ++buf;
495 }
496 /* trailing space padding */
497 while (--spec.field_width >= 0) {
498 if (buf < end)
499 *buf = ' ';
500 ++buf;
501 }
502
503 return buf;
504 }
505
506 static noinline_for_stack
507 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
508 {
509 int len, i;
510
511 if ((unsigned long)s < PAGE_SIZE)
512 s = "(null)";
513
514 len = strnlen(s, spec.precision);
515
516 if (!(spec.flags & LEFT)) {
517 while (len < spec.field_width--) {
518 if (buf < end)
519 *buf = ' ';
520 ++buf;
521 }
522 }
523 for (i = 0; i < len; ++i) {
524 if (buf < end)
525 *buf = *s;
526 ++buf; ++s;
527 }
528 while (len < spec.field_width--) {
529 if (buf < end)
530 *buf = ' ';
531 ++buf;
532 }
533
534 return buf;
535 }
536
537 static void widen(char *buf, char *end, unsigned len, unsigned spaces)
538 {
539 size_t size;
540 if (buf >= end) /* nowhere to put anything */
541 return;
542 size = end - buf;
543 if (size <= spaces) {
544 memset(buf, ' ', size);
545 return;
546 }
547 if (len) {
548 if (len > size - spaces)
549 len = size - spaces;
550 memmove(buf + spaces, buf, len);
551 }
552 memset(buf, ' ', spaces);
553 }
554
555 static noinline_for_stack
556 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
557 const char *fmt)
558 {
559 const char *array[4], *s;
560 const struct dentry *p;
561 int depth;
562 int i, n;
563
564 switch (fmt[1]) {
565 case '2': case '3': case '4':
566 depth = fmt[1] - '0';
567 break;
568 default:
569 depth = 1;
570 }
571
572 rcu_read_lock();
573 for (i = 0; i < depth; i++, d = p) {
574 p = ACCESS_ONCE(d->d_parent);
575 array[i] = ACCESS_ONCE(d->d_name.name);
576 if (p == d) {
577 if (i)
578 array[i] = "";
579 i++;
580 break;
581 }
582 }
583 s = array[--i];
584 for (n = 0; n != spec.precision; n++, buf++) {
585 char c = *s++;
586 if (!c) {
587 if (!i)
588 break;
589 c = '/';
590 s = array[--i];
591 }
592 if (buf < end)
593 *buf = c;
594 }
595 rcu_read_unlock();
596 if (n < spec.field_width) {
597 /* we want to pad the sucker */
598 unsigned spaces = spec.field_width - n;
599 if (!(spec.flags & LEFT)) {
600 widen(buf - n, end, n, spaces);
601 return buf + spaces;
602 }
603 while (spaces--) {
604 if (buf < end)
605 *buf = ' ';
606 ++buf;
607 }
608 }
609 return buf;
610 }
611
612 static noinline_for_stack
613 char *symbol_string(char *buf, char *end, void *ptr,
614 struct printf_spec spec, const char *fmt)
615 {
616 unsigned long value;
617 #ifdef CONFIG_KALLSYMS
618 char sym[KSYM_SYMBOL_LEN];
619 #endif
620
621 if (fmt[1] == 'R')
622 ptr = __builtin_extract_return_addr(ptr);
623 value = (unsigned long)ptr;
624
625 #ifdef CONFIG_KALLSYMS
626 if (*fmt == 'B')
627 sprint_backtrace(sym, value);
628 else if (*fmt != 'f' && *fmt != 's')
629 sprint_symbol(sym, value);
630 else
631 sprint_symbol_no_offset(sym, value);
632
633 return string(buf, end, sym, spec);
634 #else
635 spec.field_width = 2 * sizeof(void *);
636 spec.flags |= SPECIAL | SMALL | ZEROPAD;
637 spec.base = 16;
638
639 return number(buf, end, value, spec);
640 #endif
641 }
642
643 static noinline_for_stack
644 char *resource_string(char *buf, char *end, struct resource *res,
645 struct printf_spec spec, const char *fmt)
646 {
647 #ifndef IO_RSRC_PRINTK_SIZE
648 #define IO_RSRC_PRINTK_SIZE 6
649 #endif
650
651 #ifndef MEM_RSRC_PRINTK_SIZE
652 #define MEM_RSRC_PRINTK_SIZE 10
653 #endif
654 static const struct printf_spec io_spec = {
655 .base = 16,
656 .field_width = IO_RSRC_PRINTK_SIZE,
657 .precision = -1,
658 .flags = SPECIAL | SMALL | ZEROPAD,
659 };
660 static const struct printf_spec mem_spec = {
661 .base = 16,
662 .field_width = MEM_RSRC_PRINTK_SIZE,
663 .precision = -1,
664 .flags = SPECIAL | SMALL | ZEROPAD,
665 };
666 static const struct printf_spec bus_spec = {
667 .base = 16,
668 .field_width = 2,
669 .precision = -1,
670 .flags = SMALL | ZEROPAD,
671 };
672 static const struct printf_spec dec_spec = {
673 .base = 10,
674 .precision = -1,
675 .flags = 0,
676 };
677 static const struct printf_spec str_spec = {
678 .field_width = -1,
679 .precision = 10,
680 .flags = LEFT,
681 };
682 static const struct printf_spec flag_spec = {
683 .base = 16,
684 .precision = -1,
685 .flags = SPECIAL | SMALL,
686 };
687
688 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
689 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
690 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
691 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
692 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
693 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
694 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
695 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
696
697 char *p = sym, *pend = sym + sizeof(sym);
698 int decode = (fmt[0] == 'R') ? 1 : 0;
699 const struct printf_spec *specp;
700
701 *p++ = '[';
702 if (res->flags & IORESOURCE_IO) {
703 p = string(p, pend, "io ", str_spec);
704 specp = &io_spec;
705 } else if (res->flags & IORESOURCE_MEM) {
706 p = string(p, pend, "mem ", str_spec);
707 specp = &mem_spec;
708 } else if (res->flags & IORESOURCE_IRQ) {
709 p = string(p, pend, "irq ", str_spec);
710 specp = &dec_spec;
711 } else if (res->flags & IORESOURCE_DMA) {
712 p = string(p, pend, "dma ", str_spec);
713 specp = &dec_spec;
714 } else if (res->flags & IORESOURCE_BUS) {
715 p = string(p, pend, "bus ", str_spec);
716 specp = &bus_spec;
717 } else {
718 p = string(p, pend, "??? ", str_spec);
719 specp = &mem_spec;
720 decode = 0;
721 }
722 p = number(p, pend, res->start, *specp);
723 if (res->start != res->end) {
724 *p++ = '-';
725 p = number(p, pend, res->end, *specp);
726 }
727 if (decode) {
728 if (res->flags & IORESOURCE_MEM_64)
729 p = string(p, pend, " 64bit", str_spec);
730 if (res->flags & IORESOURCE_PREFETCH)
731 p = string(p, pend, " pref", str_spec);
732 if (res->flags & IORESOURCE_WINDOW)
733 p = string(p, pend, " window", str_spec);
734 if (res->flags & IORESOURCE_DISABLED)
735 p = string(p, pend, " disabled", str_spec);
736 } else {
737 p = string(p, pend, " flags ", str_spec);
738 p = number(p, pend, res->flags, flag_spec);
739 }
740 *p++ = ']';
741 *p = '\0';
742
743 return string(buf, end, sym, spec);
744 }
745
746 static noinline_for_stack
747 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
748 const char *fmt)
749 {
750 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
751 negative value, fallback to the default */
752 char separator;
753
754 if (spec.field_width == 0)
755 /* nothing to print */
756 return buf;
757
758 if (ZERO_OR_NULL_PTR(addr))
759 /* NULL pointer */
760 return string(buf, end, NULL, spec);
761
762 switch (fmt[1]) {
763 case 'C':
764 separator = ':';
765 break;
766 case 'D':
767 separator = '-';
768 break;
769 case 'N':
770 separator = 0;
771 break;
772 default:
773 separator = ' ';
774 break;
775 }
776
777 if (spec.field_width > 0)
778 len = min_t(int, spec.field_width, 64);
779
780 for (i = 0; i < len && buf < end - 1; i++) {
781 buf = hex_byte_pack(buf, addr[i]);
782
783 if (buf < end && separator && i != len - 1)
784 *buf++ = separator;
785 }
786
787 return buf;
788 }
789
790 static noinline_for_stack
791 char *mac_address_string(char *buf, char *end, u8 *addr,
792 struct printf_spec spec, const char *fmt)
793 {
794 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
795 char *p = mac_addr;
796 int i;
797 char separator;
798 bool reversed = false;
799
800 switch (fmt[1]) {
801 case 'F':
802 separator = '-';
803 break;
804
805 case 'R':
806 reversed = true;
807 /* fall through */
808
809 default:
810 separator = ':';
811 break;
812 }
813
814 for (i = 0; i < 6; i++) {
815 if (reversed)
816 p = hex_byte_pack(p, addr[5 - i]);
817 else
818 p = hex_byte_pack(p, addr[i]);
819
820 if (fmt[0] == 'M' && i != 5)
821 *p++ = separator;
822 }
823 *p = '\0';
824
825 return string(buf, end, mac_addr, spec);
826 }
827
828 static noinline_for_stack
829 char *ip4_string(char *p, const u8 *addr, const char *fmt)
830 {
831 int i;
832 bool leading_zeros = (fmt[0] == 'i');
833 int index;
834 int step;
835
836 switch (fmt[2]) {
837 case 'h':
838 #ifdef __BIG_ENDIAN
839 index = 0;
840 step = 1;
841 #else
842 index = 3;
843 step = -1;
844 #endif
845 break;
846 case 'l':
847 index = 3;
848 step = -1;
849 break;
850 case 'n':
851 case 'b':
852 default:
853 index = 0;
854 step = 1;
855 break;
856 }
857 for (i = 0; i < 4; i++) {
858 char temp[3]; /* hold each IP quad in reverse order */
859 int digits = put_dec_trunc8(temp, addr[index]) - temp;
860 if (leading_zeros) {
861 if (digits < 3)
862 *p++ = '0';
863 if (digits < 2)
864 *p++ = '0';
865 }
866 /* reverse the digits in the quad */
867 while (digits--)
868 *p++ = temp[digits];
869 if (i < 3)
870 *p++ = '.';
871 index += step;
872 }
873 *p = '\0';
874
875 return p;
876 }
877
878 static noinline_for_stack
879 char *ip6_compressed_string(char *p, const char *addr)
880 {
881 int i, j, range;
882 unsigned char zerolength[8];
883 int longest = 1;
884 int colonpos = -1;
885 u16 word;
886 u8 hi, lo;
887 bool needcolon = false;
888 bool useIPv4;
889 struct in6_addr in6;
890
891 memcpy(&in6, addr, sizeof(struct in6_addr));
892
893 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
894
895 memset(zerolength, 0, sizeof(zerolength));
896
897 if (useIPv4)
898 range = 6;
899 else
900 range = 8;
901
902 /* find position of longest 0 run */
903 for (i = 0; i < range; i++) {
904 for (j = i; j < range; j++) {
905 if (in6.s6_addr16[j] != 0)
906 break;
907 zerolength[i]++;
908 }
909 }
910 for (i = 0; i < range; i++) {
911 if (zerolength[i] > longest) {
912 longest = zerolength[i];
913 colonpos = i;
914 }
915 }
916 if (longest == 1) /* don't compress a single 0 */
917 colonpos = -1;
918
919 /* emit address */
920 for (i = 0; i < range; i++) {
921 if (i == colonpos) {
922 if (needcolon || i == 0)
923 *p++ = ':';
924 *p++ = ':';
925 needcolon = false;
926 i += longest - 1;
927 continue;
928 }
929 if (needcolon) {
930 *p++ = ':';
931 needcolon = false;
932 }
933 /* hex u16 without leading 0s */
934 word = ntohs(in6.s6_addr16[i]);
935 hi = word >> 8;
936 lo = word & 0xff;
937 if (hi) {
938 if (hi > 0x0f)
939 p = hex_byte_pack(p, hi);
940 else
941 *p++ = hex_asc_lo(hi);
942 p = hex_byte_pack(p, lo);
943 }
944 else if (lo > 0x0f)
945 p = hex_byte_pack(p, lo);
946 else
947 *p++ = hex_asc_lo(lo);
948 needcolon = true;
949 }
950
951 if (useIPv4) {
952 if (needcolon)
953 *p++ = ':';
954 p = ip4_string(p, &in6.s6_addr[12], "I4");
955 }
956 *p = '\0';
957
958 return p;
959 }
960
961 static noinline_for_stack
962 char *ip6_string(char *p, const char *addr, const char *fmt)
963 {
964 int i;
965
966 for (i = 0; i < 8; i++) {
967 p = hex_byte_pack(p, *addr++);
968 p = hex_byte_pack(p, *addr++);
969 if (fmt[0] == 'I' && i != 7)
970 *p++ = ':';
971 }
972 *p = '\0';
973
974 return p;
975 }
976
977 static noinline_for_stack
978 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
979 struct printf_spec spec, const char *fmt)
980 {
981 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
982
983 if (fmt[0] == 'I' && fmt[2] == 'c')
984 ip6_compressed_string(ip6_addr, addr);
985 else
986 ip6_string(ip6_addr, addr, fmt);
987
988 return string(buf, end, ip6_addr, spec);
989 }
990
991 static noinline_for_stack
992 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
993 struct printf_spec spec, const char *fmt)
994 {
995 char ip4_addr[sizeof("255.255.255.255")];
996
997 ip4_string(ip4_addr, addr, fmt);
998
999 return string(buf, end, ip4_addr, spec);
1000 }
1001
1002 static noinline_for_stack
1003 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1004 struct printf_spec spec, const char *fmt)
1005 {
1006 bool have_p = false, have_s = false, have_f = false, have_c = false;
1007 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1008 sizeof(":12345") + sizeof("/123456789") +
1009 sizeof("%1234567890")];
1010 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1011 const u8 *addr = (const u8 *) &sa->sin6_addr;
1012 char fmt6[2] = { fmt[0], '6' };
1013 u8 off = 0;
1014
1015 fmt++;
1016 while (isalpha(*++fmt)) {
1017 switch (*fmt) {
1018 case 'p':
1019 have_p = true;
1020 break;
1021 case 'f':
1022 have_f = true;
1023 break;
1024 case 's':
1025 have_s = true;
1026 break;
1027 case 'c':
1028 have_c = true;
1029 break;
1030 }
1031 }
1032
1033 if (have_p || have_s || have_f) {
1034 *p = '[';
1035 off = 1;
1036 }
1037
1038 if (fmt6[0] == 'I' && have_c)
1039 p = ip6_compressed_string(ip6_addr + off, addr);
1040 else
1041 p = ip6_string(ip6_addr + off, addr, fmt6);
1042
1043 if (have_p || have_s || have_f)
1044 *p++ = ']';
1045
1046 if (have_p) {
1047 *p++ = ':';
1048 p = number(p, pend, ntohs(sa->sin6_port), spec);
1049 }
1050 if (have_f) {
1051 *p++ = '/';
1052 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1053 IPV6_FLOWINFO_MASK), spec);
1054 }
1055 if (have_s) {
1056 *p++ = '%';
1057 p = number(p, pend, sa->sin6_scope_id, spec);
1058 }
1059 *p = '\0';
1060
1061 return string(buf, end, ip6_addr, spec);
1062 }
1063
1064 static noinline_for_stack
1065 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1066 struct printf_spec spec, const char *fmt)
1067 {
1068 bool have_p = false;
1069 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1070 char *pend = ip4_addr + sizeof(ip4_addr);
1071 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1072 char fmt4[3] = { fmt[0], '4', 0 };
1073
1074 fmt++;
1075 while (isalpha(*++fmt)) {
1076 switch (*fmt) {
1077 case 'p':
1078 have_p = true;
1079 break;
1080 case 'h':
1081 case 'l':
1082 case 'n':
1083 case 'b':
1084 fmt4[2] = *fmt;
1085 break;
1086 }
1087 }
1088
1089 p = ip4_string(ip4_addr, addr, fmt4);
1090 if (have_p) {
1091 *p++ = ':';
1092 p = number(p, pend, ntohs(sa->sin_port), spec);
1093 }
1094 *p = '\0';
1095
1096 return string(buf, end, ip4_addr, spec);
1097 }
1098
1099 static noinline_for_stack
1100 char *uuid_string(char *buf, char *end, const u8 *addr,
1101 struct printf_spec spec, const char *fmt)
1102 {
1103 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
1104 char *p = uuid;
1105 int i;
1106 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
1107 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
1108 const u8 *index = be;
1109 bool uc = false;
1110
1111 switch (*(++fmt)) {
1112 case 'L':
1113 uc = true; /* fall-through */
1114 case 'l':
1115 index = le;
1116 break;
1117 case 'B':
1118 uc = true;
1119 break;
1120 }
1121
1122 for (i = 0; i < 16; i++) {
1123 p = hex_byte_pack(p, addr[index[i]]);
1124 switch (i) {
1125 case 3:
1126 case 5:
1127 case 7:
1128 case 9:
1129 *p++ = '-';
1130 break;
1131 }
1132 }
1133
1134 *p = 0;
1135
1136 if (uc) {
1137 p = uuid;
1138 do {
1139 *p = toupper(*p);
1140 } while (*(++p));
1141 }
1142
1143 return string(buf, end, uuid, spec);
1144 }
1145
1146 static
1147 char *netdev_feature_string(char *buf, char *end, const u8 *addr,
1148 struct printf_spec spec)
1149 {
1150 spec.flags |= SPECIAL | SMALL | ZEROPAD;
1151 if (spec.field_width == -1)
1152 spec.field_width = 2 + 2 * sizeof(netdev_features_t);
1153 spec.base = 16;
1154
1155 return number(buf, end, *(const netdev_features_t *)addr, spec);
1156 }
1157
1158 int kptr_restrict __read_mostly;
1159
1160 /*
1161 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1162 * by an extra set of alphanumeric characters that are extended format
1163 * specifiers.
1164 *
1165 * Right now we handle:
1166 *
1167 * - 'F' For symbolic function descriptor pointers with offset
1168 * - 'f' For simple symbolic function names without offset
1169 * - 'S' For symbolic direct pointers with offset
1170 * - 's' For symbolic direct pointers without offset
1171 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1172 * - 'B' For backtraced symbolic direct pointers with offset
1173 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1174 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1175 * - 'M' For a 6-byte MAC address, it prints the address in the
1176 * usual colon-separated hex notation
1177 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1178 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1179 * with a dash-separated hex notation
1180 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1181 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1182 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1183 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1184 * [S][pfs]
1185 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1186 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1187 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1188 * IPv6 omits the colons (01020304...0f)
1189 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1190 * [S][pfs]
1191 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1192 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1193 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1194 * - 'I[6S]c' for IPv6 addresses printed as specified by
1195 * http://tools.ietf.org/html/rfc5952
1196 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1197 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1198 * Options for %pU are:
1199 * b big endian lower case hex (default)
1200 * B big endian UPPER case hex
1201 * l little endian lower case hex
1202 * L little endian UPPER case hex
1203 * big endian output byte order is:
1204 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1205 * little endian output byte order is:
1206 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1207 * - 'V' For a struct va_format which contains a format string * and va_list *,
1208 * call vsnprintf(->format, *->va_list).
1209 * Implements a "recursive vsnprintf".
1210 * Do not use this feature without some mechanism to verify the
1211 * correctness of the format string and va_list arguments.
1212 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1213 * - 'NF' For a netdev_features_t
1214 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1215 * a certain separator (' ' by default):
1216 * C colon
1217 * D dash
1218 * N no separator
1219 * The maximum supported length is 64 bytes of the input. Consider
1220 * to use print_hex_dump() for the larger input.
1221 * - 'a' For a phys_addr_t type and its derivative types (passed by reference)
1222 * - 'd[234]' For a dentry name (optionally 2-4 last components)
1223 * - 'D[234]' Same as 'd' but for a struct file
1224 *
1225 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1226 * function pointers are really function descriptors, which contain a
1227 * pointer to the real address.
1228 */
1229 static noinline_for_stack
1230 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
1231 struct printf_spec spec)
1232 {
1233 int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
1234
1235 if (!ptr && *fmt != 'K') {
1236 /*
1237 * Print (null) with the same width as a pointer so it makes
1238 * tabular output look nice.
1239 */
1240 if (spec.field_width == -1)
1241 spec.field_width = default_width;
1242 return string(buf, end, "(null)", spec);
1243 }
1244
1245 switch (*fmt) {
1246 case 'F':
1247 case 'f':
1248 ptr = dereference_function_descriptor(ptr);
1249 /* Fallthrough */
1250 case 'S':
1251 case 's':
1252 case 'B':
1253 return symbol_string(buf, end, ptr, spec, fmt);
1254 case 'R':
1255 case 'r':
1256 return resource_string(buf, end, ptr, spec, fmt);
1257 case 'h':
1258 return hex_string(buf, end, ptr, spec, fmt);
1259 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1260 case 'm': /* Contiguous: 000102030405 */
1261 /* [mM]F (FDDI) */
1262 /* [mM]R (Reverse order; Bluetooth) */
1263 return mac_address_string(buf, end, ptr, spec, fmt);
1264 case 'I': /* Formatted IP supported
1265 * 4: 1.2.3.4
1266 * 6: 0001:0203:...:0708
1267 * 6c: 1::708 or 1::1.2.3.4
1268 */
1269 case 'i': /* Contiguous:
1270 * 4: 001.002.003.004
1271 * 6: 000102...0f
1272 */
1273 switch (fmt[1]) {
1274 case '6':
1275 return ip6_addr_string(buf, end, ptr, spec, fmt);
1276 case '4':
1277 return ip4_addr_string(buf, end, ptr, spec, fmt);
1278 case 'S': {
1279 const union {
1280 struct sockaddr raw;
1281 struct sockaddr_in v4;
1282 struct sockaddr_in6 v6;
1283 } *sa = ptr;
1284
1285 switch (sa->raw.sa_family) {
1286 case AF_INET:
1287 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1288 case AF_INET6:
1289 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1290 default:
1291 return string(buf, end, "(invalid address)", spec);
1292 }}
1293 }
1294 break;
1295 case 'U':
1296 return uuid_string(buf, end, ptr, spec, fmt);
1297 case 'V':
1298 {
1299 va_list va;
1300
1301 va_copy(va, *((struct va_format *)ptr)->va);
1302 buf += vsnprintf(buf, end > buf ? end - buf : 0,
1303 ((struct va_format *)ptr)->fmt, va);
1304 va_end(va);
1305 return buf;
1306 }
1307 case 'K':
1308 /*
1309 * %pK cannot be used in IRQ context because its test
1310 * for CAP_SYSLOG would be meaningless.
1311 */
1312 if (kptr_restrict && (in_irq() || in_serving_softirq() ||
1313 in_nmi())) {
1314 if (spec.field_width == -1)
1315 spec.field_width = default_width;
1316 return string(buf, end, "pK-error", spec);
1317 }
1318
1319 switch (kptr_restrict) {
1320 case 0:
1321 /* Always print %pK values */
1322 break;
1323 case 1: {
1324 /*
1325 * Only print the real pointer value if the current
1326 * process has CAP_SYSLOG and is running with the
1327 * same credentials it started with. This is because
1328 * access to files is checked at open() time, but %pK
1329 * checks permission at read() time. We don't want to
1330 * leak pointer values if a binary opens a file using
1331 * %pK and then elevates privileges before reading it.
1332 */
1333 const struct cred *cred = current_cred();
1334
1335 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
1336 !uid_eq(cred->euid, cred->uid) ||
1337 !gid_eq(cred->egid, cred->gid))
1338 ptr = NULL;
1339 break;
1340 }
1341 case 2:
1342 default:
1343 /* Always print 0's for %pK */
1344 ptr = NULL;
1345 break;
1346 }
1347 break;
1348
1349 case 'N':
1350 switch (fmt[1]) {
1351 case 'F':
1352 return netdev_feature_string(buf, end, ptr, spec);
1353 }
1354 break;
1355 case 'a':
1356 spec.flags |= SPECIAL | SMALL | ZEROPAD;
1357 spec.field_width = sizeof(phys_addr_t) * 2 + 2;
1358 spec.base = 16;
1359 return number(buf, end,
1360 (unsigned long long) *((phys_addr_t *)ptr), spec);
1361 case 'd':
1362 return dentry_name(buf, end, ptr, spec, fmt);
1363 case 'D':
1364 return dentry_name(buf, end,
1365 ((const struct file *)ptr)->f_path.dentry,
1366 spec, fmt);
1367 }
1368 spec.flags |= SMALL;
1369 if (spec.field_width == -1) {
1370 spec.field_width = default_width;
1371 spec.flags |= ZEROPAD;
1372 }
1373 spec.base = 16;
1374
1375 return number(buf, end, (unsigned long) ptr, spec);
1376 }
1377
1378 /*
1379 * Helper function to decode printf style format.
1380 * Each call decode a token from the format and return the
1381 * number of characters read (or likely the delta where it wants
1382 * to go on the next call).
1383 * The decoded token is returned through the parameters
1384 *
1385 * 'h', 'l', or 'L' for integer fields
1386 * 'z' support added 23/7/1999 S.H.
1387 * 'z' changed to 'Z' --davidm 1/25/99
1388 * 't' added for ptrdiff_t
1389 *
1390 * @fmt: the format string
1391 * @type of the token returned
1392 * @flags: various flags such as +, -, # tokens..
1393 * @field_width: overwritten width
1394 * @base: base of the number (octal, hex, ...)
1395 * @precision: precision of a number
1396 * @qualifier: qualifier of a number (long, size_t, ...)
1397 */
1398 static noinline_for_stack
1399 int format_decode(const char *fmt, struct printf_spec *spec)
1400 {
1401 const char *start = fmt;
1402
1403 /* we finished early by reading the field width */
1404 if (spec->type == FORMAT_TYPE_WIDTH) {
1405 if (spec->field_width < 0) {
1406 spec->field_width = -spec->field_width;
1407 spec->flags |= LEFT;
1408 }
1409 spec->type = FORMAT_TYPE_NONE;
1410 goto precision;
1411 }
1412
1413 /* we finished early by reading the precision */
1414 if (spec->type == FORMAT_TYPE_PRECISION) {
1415 if (spec->precision < 0)
1416 spec->precision = 0;
1417
1418 spec->type = FORMAT_TYPE_NONE;
1419 goto qualifier;
1420 }
1421
1422 /* By default */
1423 spec->type = FORMAT_TYPE_NONE;
1424
1425 for (; *fmt ; ++fmt) {
1426 if (*fmt == '%')
1427 break;
1428 }
1429
1430 /* Return the current non-format string */
1431 if (fmt != start || !*fmt)
1432 return fmt - start;
1433
1434 /* Process flags */
1435 spec->flags = 0;
1436
1437 while (1) { /* this also skips first '%' */
1438 bool found = true;
1439
1440 ++fmt;
1441
1442 switch (*fmt) {
1443 case '-': spec->flags |= LEFT; break;
1444 case '+': spec->flags |= PLUS; break;
1445 case ' ': spec->flags |= SPACE; break;
1446 case '#': spec->flags |= SPECIAL; break;
1447 case '0': spec->flags |= ZEROPAD; break;
1448 default: found = false;
1449 }
1450
1451 if (!found)
1452 break;
1453 }
1454
1455 /* get field width */
1456 spec->field_width = -1;
1457
1458 if (isdigit(*fmt))
1459 spec->field_width = skip_atoi(&fmt);
1460 else if (*fmt == '*') {
1461 /* it's the next argument */
1462 spec->type = FORMAT_TYPE_WIDTH;
1463 return ++fmt - start;
1464 }
1465
1466 precision:
1467 /* get the precision */
1468 spec->precision = -1;
1469 if (*fmt == '.') {
1470 ++fmt;
1471 if (isdigit(*fmt)) {
1472 spec->precision = skip_atoi(&fmt);
1473 if (spec->precision < 0)
1474 spec->precision = 0;
1475 } else if (*fmt == '*') {
1476 /* it's the next argument */
1477 spec->type = FORMAT_TYPE_PRECISION;
1478 return ++fmt - start;
1479 }
1480 }
1481
1482 qualifier:
1483 /* get the conversion qualifier */
1484 spec->qualifier = -1;
1485 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1486 _tolower(*fmt) == 'z' || *fmt == 't') {
1487 spec->qualifier = *fmt++;
1488 if (unlikely(spec->qualifier == *fmt)) {
1489 if (spec->qualifier == 'l') {
1490 spec->qualifier = 'L';
1491 ++fmt;
1492 } else if (spec->qualifier == 'h') {
1493 spec->qualifier = 'H';
1494 ++fmt;
1495 }
1496 }
1497 }
1498
1499 /* default base */
1500 spec->base = 10;
1501 switch (*fmt) {
1502 case 'c':
1503 spec->type = FORMAT_TYPE_CHAR;
1504 return ++fmt - start;
1505
1506 case 's':
1507 spec->type = FORMAT_TYPE_STR;
1508 return ++fmt - start;
1509
1510 case 'p':
1511 spec->type = FORMAT_TYPE_PTR;
1512 return fmt - start;
1513 /* skip alnum */
1514
1515 case 'n':
1516 spec->type = FORMAT_TYPE_NRCHARS;
1517 return ++fmt - start;
1518
1519 case '%':
1520 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1521 return ++fmt - start;
1522
1523 /* integer number formats - set up the flags and "break" */
1524 case 'o':
1525 spec->base = 8;
1526 break;
1527
1528 case 'x':
1529 spec->flags |= SMALL;
1530
1531 case 'X':
1532 spec->base = 16;
1533 break;
1534
1535 case 'd':
1536 case 'i':
1537 spec->flags |= SIGN;
1538 case 'u':
1539 break;
1540
1541 default:
1542 spec->type = FORMAT_TYPE_INVALID;
1543 return fmt - start;
1544 }
1545
1546 if (spec->qualifier == 'L')
1547 spec->type = FORMAT_TYPE_LONG_LONG;
1548 else if (spec->qualifier == 'l') {
1549 if (spec->flags & SIGN)
1550 spec->type = FORMAT_TYPE_LONG;
1551 else
1552 spec->type = FORMAT_TYPE_ULONG;
1553 } else if (_tolower(spec->qualifier) == 'z') {
1554 spec->type = FORMAT_TYPE_SIZE_T;
1555 } else if (spec->qualifier == 't') {
1556 spec->type = FORMAT_TYPE_PTRDIFF;
1557 } else if (spec->qualifier == 'H') {
1558 if (spec->flags & SIGN)
1559 spec->type = FORMAT_TYPE_BYTE;
1560 else
1561 spec->type = FORMAT_TYPE_UBYTE;
1562 } else if (spec->qualifier == 'h') {
1563 if (spec->flags & SIGN)
1564 spec->type = FORMAT_TYPE_SHORT;
1565 else
1566 spec->type = FORMAT_TYPE_USHORT;
1567 } else {
1568 if (spec->flags & SIGN)
1569 spec->type = FORMAT_TYPE_INT;
1570 else
1571 spec->type = FORMAT_TYPE_UINT;
1572 }
1573
1574 return ++fmt - start;
1575 }
1576
1577 /**
1578 * vsnprintf - Format a string and place it in a buffer
1579 * @buf: The buffer to place the result into
1580 * @size: The size of the buffer, including the trailing null space
1581 * @fmt: The format string to use
1582 * @args: Arguments for the format string
1583 *
1584 * This function follows C99 vsnprintf, but has some extensions:
1585 * %pS output the name of a text symbol with offset
1586 * %ps output the name of a text symbol without offset
1587 * %pF output the name of a function pointer with its offset
1588 * %pf output the name of a function pointer without its offset
1589 * %pB output the name of a backtrace symbol with its offset
1590 * %pR output the address range in a struct resource with decoded flags
1591 * %pr output the address range in a struct resource with raw flags
1592 * %pM output a 6-byte MAC address with colons
1593 * %pMR output a 6-byte MAC address with colons in reversed order
1594 * %pMF output a 6-byte MAC address with dashes
1595 * %pm output a 6-byte MAC address without colons
1596 * %pmR output a 6-byte MAC address without colons in reversed order
1597 * %pI4 print an IPv4 address without leading zeros
1598 * %pi4 print an IPv4 address with leading zeros
1599 * %pI6 print an IPv6 address with colons
1600 * %pi6 print an IPv6 address without colons
1601 * %pI6c print an IPv6 address as specified by RFC 5952
1602 * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
1603 * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
1604 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1605 * case.
1606 * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
1607 * bytes of the input)
1608 * %n is ignored
1609 *
1610 * ** Please update Documentation/printk-formats.txt when making changes **
1611 *
1612 * The return value is the number of characters which would
1613 * be generated for the given input, excluding the trailing
1614 * '\0', as per ISO C99. If you want to have the exact
1615 * number of characters written into @buf as return value
1616 * (not including the trailing '\0'), use vscnprintf(). If the
1617 * return is greater than or equal to @size, the resulting
1618 * string is truncated.
1619 *
1620 * If you're not already dealing with a va_list consider using snprintf().
1621 */
1622 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1623 {
1624 unsigned long long num;
1625 char *str, *end;
1626 struct printf_spec spec = {0};
1627
1628 /* Reject out-of-range values early. Large positive sizes are
1629 used for unknown buffer sizes. */
1630 if (WARN_ON_ONCE((int) size < 0))
1631 return 0;
1632
1633 str = buf;
1634 end = buf + size;
1635
1636 /* Make sure end is always >= buf */
1637 if (end < buf) {
1638 end = ((void *)-1);
1639 size = end - buf;
1640 }
1641
1642 while (*fmt) {
1643 const char *old_fmt = fmt;
1644 int read = format_decode(fmt, &spec);
1645
1646 fmt += read;
1647
1648 switch (spec.type) {
1649 case FORMAT_TYPE_NONE: {
1650 int copy = read;
1651 if (str < end) {
1652 if (copy > end - str)
1653 copy = end - str;
1654 memcpy(str, old_fmt, copy);
1655 }
1656 str += read;
1657 break;
1658 }
1659
1660 case FORMAT_TYPE_WIDTH:
1661 spec.field_width = va_arg(args, int);
1662 break;
1663
1664 case FORMAT_TYPE_PRECISION:
1665 spec.precision = va_arg(args, int);
1666 break;
1667
1668 case FORMAT_TYPE_CHAR: {
1669 char c;
1670
1671 if (!(spec.flags & LEFT)) {
1672 while (--spec.field_width > 0) {
1673 if (str < end)
1674 *str = ' ';
1675 ++str;
1676
1677 }
1678 }
1679 c = (unsigned char) va_arg(args, int);
1680 if (str < end)
1681 *str = c;
1682 ++str;
1683 while (--spec.field_width > 0) {
1684 if (str < end)
1685 *str = ' ';
1686 ++str;
1687 }
1688 break;
1689 }
1690
1691 case FORMAT_TYPE_STR:
1692 str = string(str, end, va_arg(args, char *), spec);
1693 break;
1694
1695 case FORMAT_TYPE_PTR:
1696 str = pointer(fmt+1, str, end, va_arg(args, void *),
1697 spec);
1698 while (isalnum(*fmt))
1699 fmt++;
1700 break;
1701
1702 case FORMAT_TYPE_PERCENT_CHAR:
1703 if (str < end)
1704 *str = '%';
1705 ++str;
1706 break;
1707
1708 case FORMAT_TYPE_INVALID:
1709 if (str < end)
1710 *str = '%';
1711 ++str;
1712 break;
1713
1714 case FORMAT_TYPE_NRCHARS: {
1715 u8 qualifier = spec.qualifier;
1716
1717 if (qualifier == 'l') {
1718 long *ip = va_arg(args, long *);
1719 *ip = (str - buf);
1720 } else if (_tolower(qualifier) == 'z') {
1721 size_t *ip = va_arg(args, size_t *);
1722 *ip = (str - buf);
1723 } else {
1724 int *ip = va_arg(args, int *);
1725 *ip = (str - buf);
1726 }
1727 break;
1728 }
1729
1730 default:
1731 switch (spec.type) {
1732 case FORMAT_TYPE_LONG_LONG:
1733 num = va_arg(args, long long);
1734 break;
1735 case FORMAT_TYPE_ULONG:
1736 num = va_arg(args, unsigned long);
1737 break;
1738 case FORMAT_TYPE_LONG:
1739 num = va_arg(args, long);
1740 break;
1741 case FORMAT_TYPE_SIZE_T:
1742 if (spec.flags & SIGN)
1743 num = va_arg(args, ssize_t);
1744 else
1745 num = va_arg(args, size_t);
1746 break;
1747 case FORMAT_TYPE_PTRDIFF:
1748 num = va_arg(args, ptrdiff_t);
1749 break;
1750 case FORMAT_TYPE_UBYTE:
1751 num = (unsigned char) va_arg(args, int);
1752 break;
1753 case FORMAT_TYPE_BYTE:
1754 num = (signed char) va_arg(args, int);
1755 break;
1756 case FORMAT_TYPE_USHORT:
1757 num = (unsigned short) va_arg(args, int);
1758 break;
1759 case FORMAT_TYPE_SHORT:
1760 num = (short) va_arg(args, int);
1761 break;
1762 case FORMAT_TYPE_INT:
1763 num = (int) va_arg(args, int);
1764 break;
1765 default:
1766 num = va_arg(args, unsigned int);
1767 }
1768
1769 str = number(str, end, num, spec);
1770 }
1771 }
1772
1773 if (size > 0) {
1774 if (str < end)
1775 *str = '\0';
1776 else
1777 end[-1] = '\0';
1778 }
1779
1780 /* the trailing null byte doesn't count towards the total */
1781 return str-buf;
1782
1783 }
1784 EXPORT_SYMBOL(vsnprintf);
1785
1786 /**
1787 * vscnprintf - Format a string and place it in a buffer
1788 * @buf: The buffer to place the result into
1789 * @size: The size of the buffer, including the trailing null space
1790 * @fmt: The format string to use
1791 * @args: Arguments for the format string
1792 *
1793 * The return value is the number of characters which have been written into
1794 * the @buf not including the trailing '\0'. If @size is == 0 the function
1795 * returns 0.
1796 *
1797 * If you're not already dealing with a va_list consider using scnprintf().
1798 *
1799 * See the vsnprintf() documentation for format string extensions over C99.
1800 */
1801 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1802 {
1803 int i;
1804
1805 i = vsnprintf(buf, size, fmt, args);
1806
1807 if (likely(i < size))
1808 return i;
1809 if (size != 0)
1810 return size - 1;
1811 return 0;
1812 }
1813 EXPORT_SYMBOL(vscnprintf);
1814
1815 /**
1816 * snprintf - Format a string and place it in a buffer
1817 * @buf: The buffer to place the result into
1818 * @size: The size of the buffer, including the trailing null space
1819 * @fmt: The format string to use
1820 * @...: Arguments for the format string
1821 *
1822 * The return value is the number of characters which would be
1823 * generated for the given input, excluding the trailing null,
1824 * as per ISO C99. If the return is greater than or equal to
1825 * @size, the resulting string is truncated.
1826 *
1827 * See the vsnprintf() documentation for format string extensions over C99.
1828 */
1829 int snprintf(char *buf, size_t size, const char *fmt, ...)
1830 {
1831 va_list args;
1832 int i;
1833
1834 va_start(args, fmt);
1835 i = vsnprintf(buf, size, fmt, args);
1836 va_end(args);
1837
1838 return i;
1839 }
1840 EXPORT_SYMBOL(snprintf);
1841
1842 /**
1843 * scnprintf - Format a string and place it in a buffer
1844 * @buf: The buffer to place the result into
1845 * @size: The size of the buffer, including the trailing null space
1846 * @fmt: The format string to use
1847 * @...: Arguments for the format string
1848 *
1849 * The return value is the number of characters written into @buf not including
1850 * the trailing '\0'. If @size is == 0 the function returns 0.
1851 */
1852
1853 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1854 {
1855 va_list args;
1856 int i;
1857
1858 va_start(args, fmt);
1859 i = vscnprintf(buf, size, fmt, args);
1860 va_end(args);
1861
1862 return i;
1863 }
1864 EXPORT_SYMBOL(scnprintf);
1865
1866 /**
1867 * vsprintf - Format a string and place it in a buffer
1868 * @buf: The buffer to place the result into
1869 * @fmt: The format string to use
1870 * @args: Arguments for the format string
1871 *
1872 * The function returns the number of characters written
1873 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1874 * buffer overflows.
1875 *
1876 * If you're not already dealing with a va_list consider using sprintf().
1877 *
1878 * See the vsnprintf() documentation for format string extensions over C99.
1879 */
1880 int vsprintf(char *buf, const char *fmt, va_list args)
1881 {
1882 return vsnprintf(buf, INT_MAX, fmt, args);
1883 }
1884 EXPORT_SYMBOL(vsprintf);
1885
1886 /**
1887 * sprintf - Format a string and place it in a buffer
1888 * @buf: The buffer to place the result into
1889 * @fmt: The format string to use
1890 * @...: Arguments for the format string
1891 *
1892 * The function returns the number of characters written
1893 * into @buf. Use snprintf() or scnprintf() in order to avoid
1894 * buffer overflows.
1895 *
1896 * See the vsnprintf() documentation for format string extensions over C99.
1897 */
1898 int sprintf(char *buf, const char *fmt, ...)
1899 {
1900 va_list args;
1901 int i;
1902
1903 va_start(args, fmt);
1904 i = vsnprintf(buf, INT_MAX, fmt, args);
1905 va_end(args);
1906
1907 return i;
1908 }
1909 EXPORT_SYMBOL(sprintf);
1910
1911 #ifdef CONFIG_BINARY_PRINTF
1912 /*
1913 * bprintf service:
1914 * vbin_printf() - VA arguments to binary data
1915 * bstr_printf() - Binary data to text string
1916 */
1917
1918 /**
1919 * vbin_printf - Parse a format string and place args' binary value in a buffer
1920 * @bin_buf: The buffer to place args' binary value
1921 * @size: The size of the buffer(by words(32bits), not characters)
1922 * @fmt: The format string to use
1923 * @args: Arguments for the format string
1924 *
1925 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1926 * is skiped.
1927 *
1928 * The return value is the number of words(32bits) which would be generated for
1929 * the given input.
1930 *
1931 * NOTE:
1932 * If the return value is greater than @size, the resulting bin_buf is NOT
1933 * valid for bstr_printf().
1934 */
1935 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1936 {
1937 struct printf_spec spec = {0};
1938 char *str, *end;
1939
1940 str = (char *)bin_buf;
1941 end = (char *)(bin_buf + size);
1942
1943 #define save_arg(type) \
1944 do { \
1945 if (sizeof(type) == 8) { \
1946 unsigned long long value; \
1947 str = PTR_ALIGN(str, sizeof(u32)); \
1948 value = va_arg(args, unsigned long long); \
1949 if (str + sizeof(type) <= end) { \
1950 *(u32 *)str = *(u32 *)&value; \
1951 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1952 } \
1953 } else { \
1954 unsigned long value; \
1955 str = PTR_ALIGN(str, sizeof(type)); \
1956 value = va_arg(args, int); \
1957 if (str + sizeof(type) <= end) \
1958 *(typeof(type) *)str = (type)value; \
1959 } \
1960 str += sizeof(type); \
1961 } while (0)
1962
1963 while (*fmt) {
1964 int read = format_decode(fmt, &spec);
1965
1966 fmt += read;
1967
1968 switch (spec.type) {
1969 case FORMAT_TYPE_NONE:
1970 case FORMAT_TYPE_INVALID:
1971 case FORMAT_TYPE_PERCENT_CHAR:
1972 break;
1973
1974 case FORMAT_TYPE_WIDTH:
1975 case FORMAT_TYPE_PRECISION:
1976 save_arg(int);
1977 break;
1978
1979 case FORMAT_TYPE_CHAR:
1980 save_arg(char);
1981 break;
1982
1983 case FORMAT_TYPE_STR: {
1984 const char *save_str = va_arg(args, char *);
1985 size_t len;
1986
1987 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1988 || (unsigned long)save_str < PAGE_SIZE)
1989 save_str = "(null)";
1990 len = strlen(save_str) + 1;
1991 if (str + len < end)
1992 memcpy(str, save_str, len);
1993 str += len;
1994 break;
1995 }
1996
1997 case FORMAT_TYPE_PTR:
1998 save_arg(void *);
1999 /* skip all alphanumeric pointer suffixes */
2000 while (isalnum(*fmt))
2001 fmt++;
2002 break;
2003
2004 case FORMAT_TYPE_NRCHARS: {
2005 /* skip %n 's argument */
2006 u8 qualifier = spec.qualifier;
2007 void *skip_arg;
2008 if (qualifier == 'l')
2009 skip_arg = va_arg(args, long *);
2010 else if (_tolower(qualifier) == 'z')
2011 skip_arg = va_arg(args, size_t *);
2012 else
2013 skip_arg = va_arg(args, int *);
2014 break;
2015 }
2016
2017 default:
2018 switch (spec.type) {
2019
2020 case FORMAT_TYPE_LONG_LONG:
2021 save_arg(long long);
2022 break;
2023 case FORMAT_TYPE_ULONG:
2024 case FORMAT_TYPE_LONG:
2025 save_arg(unsigned long);
2026 break;
2027 case FORMAT_TYPE_SIZE_T:
2028 save_arg(size_t);
2029 break;
2030 case FORMAT_TYPE_PTRDIFF:
2031 save_arg(ptrdiff_t);
2032 break;
2033 case FORMAT_TYPE_UBYTE:
2034 case FORMAT_TYPE_BYTE:
2035 save_arg(char);
2036 break;
2037 case FORMAT_TYPE_USHORT:
2038 case FORMAT_TYPE_SHORT:
2039 save_arg(short);
2040 break;
2041 default:
2042 save_arg(int);
2043 }
2044 }
2045 }
2046
2047 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
2048 #undef save_arg
2049 }
2050 EXPORT_SYMBOL_GPL(vbin_printf);
2051
2052 /**
2053 * bstr_printf - Format a string from binary arguments and place it in a buffer
2054 * @buf: The buffer to place the result into
2055 * @size: The size of the buffer, including the trailing null space
2056 * @fmt: The format string to use
2057 * @bin_buf: Binary arguments for the format string
2058 *
2059 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2060 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2061 * a binary buffer that generated by vbin_printf.
2062 *
2063 * The format follows C99 vsnprintf, but has some extensions:
2064 * see vsnprintf comment for details.
2065 *
2066 * The return value is the number of characters which would
2067 * be generated for the given input, excluding the trailing
2068 * '\0', as per ISO C99. If you want to have the exact
2069 * number of characters written into @buf as return value
2070 * (not including the trailing '\0'), use vscnprintf(). If the
2071 * return is greater than or equal to @size, the resulting
2072 * string is truncated.
2073 */
2074 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2075 {
2076 struct printf_spec spec = {0};
2077 char *str, *end;
2078 const char *args = (const char *)bin_buf;
2079
2080 if (WARN_ON_ONCE((int) size < 0))
2081 return 0;
2082
2083 str = buf;
2084 end = buf + size;
2085
2086 #define get_arg(type) \
2087 ({ \
2088 typeof(type) value; \
2089 if (sizeof(type) == 8) { \
2090 args = PTR_ALIGN(args, sizeof(u32)); \
2091 *(u32 *)&value = *(u32 *)args; \
2092 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2093 } else { \
2094 args = PTR_ALIGN(args, sizeof(type)); \
2095 value = *(typeof(type) *)args; \
2096 } \
2097 args += sizeof(type); \
2098 value; \
2099 })
2100
2101 /* Make sure end is always >= buf */
2102 if (end < buf) {
2103 end = ((void *)-1);
2104 size = end - buf;
2105 }
2106
2107 while (*fmt) {
2108 const char *old_fmt = fmt;
2109 int read = format_decode(fmt, &spec);
2110
2111 fmt += read;
2112
2113 switch (spec.type) {
2114 case FORMAT_TYPE_NONE: {
2115 int copy = read;
2116 if (str < end) {
2117 if (copy > end - str)
2118 copy = end - str;
2119 memcpy(str, old_fmt, copy);
2120 }
2121 str += read;
2122 break;
2123 }
2124
2125 case FORMAT_TYPE_WIDTH:
2126 spec.field_width = get_arg(int);
2127 break;
2128
2129 case FORMAT_TYPE_PRECISION:
2130 spec.precision = get_arg(int);
2131 break;
2132
2133 case FORMAT_TYPE_CHAR: {
2134 char c;
2135
2136 if (!(spec.flags & LEFT)) {
2137 while (--spec.field_width > 0) {
2138 if (str < end)
2139 *str = ' ';
2140 ++str;
2141 }
2142 }
2143 c = (unsigned char) get_arg(char);
2144 if (str < end)
2145 *str = c;
2146 ++str;
2147 while (--spec.field_width > 0) {
2148 if (str < end)
2149 *str = ' ';
2150 ++str;
2151 }
2152 break;
2153 }
2154
2155 case FORMAT_TYPE_STR: {
2156 const char *str_arg = args;
2157 args += strlen(str_arg) + 1;
2158 str = string(str, end, (char *)str_arg, spec);
2159 break;
2160 }
2161
2162 case FORMAT_TYPE_PTR:
2163 str = pointer(fmt+1, str, end, get_arg(void *), spec);
2164 while (isalnum(*fmt))
2165 fmt++;
2166 break;
2167
2168 case FORMAT_TYPE_PERCENT_CHAR:
2169 case FORMAT_TYPE_INVALID:
2170 if (str < end)
2171 *str = '%';
2172 ++str;
2173 break;
2174
2175 case FORMAT_TYPE_NRCHARS:
2176 /* skip */
2177 break;
2178
2179 default: {
2180 unsigned long long num;
2181
2182 switch (spec.type) {
2183
2184 case FORMAT_TYPE_LONG_LONG:
2185 num = get_arg(long long);
2186 break;
2187 case FORMAT_TYPE_ULONG:
2188 case FORMAT_TYPE_LONG:
2189 num = get_arg(unsigned long);
2190 break;
2191 case FORMAT_TYPE_SIZE_T:
2192 num = get_arg(size_t);
2193 break;
2194 case FORMAT_TYPE_PTRDIFF:
2195 num = get_arg(ptrdiff_t);
2196 break;
2197 case FORMAT_TYPE_UBYTE:
2198 num = get_arg(unsigned char);
2199 break;
2200 case FORMAT_TYPE_BYTE:
2201 num = get_arg(signed char);
2202 break;
2203 case FORMAT_TYPE_USHORT:
2204 num = get_arg(unsigned short);
2205 break;
2206 case FORMAT_TYPE_SHORT:
2207 num = get_arg(short);
2208 break;
2209 case FORMAT_TYPE_UINT:
2210 num = get_arg(unsigned int);
2211 break;
2212 default:
2213 num = get_arg(int);
2214 }
2215
2216 str = number(str, end, num, spec);
2217 } /* default: */
2218 } /* switch(spec.type) */
2219 } /* while(*fmt) */
2220
2221 if (size > 0) {
2222 if (str < end)
2223 *str = '\0';
2224 else
2225 end[-1] = '\0';
2226 }
2227
2228 #undef get_arg
2229
2230 /* the trailing null byte doesn't count towards the total */
2231 return str - buf;
2232 }
2233 EXPORT_SYMBOL_GPL(bstr_printf);
2234
2235 /**
2236 * bprintf - Parse a format string and place args' binary value in a buffer
2237 * @bin_buf: The buffer to place args' binary value
2238 * @size: The size of the buffer(by words(32bits), not characters)
2239 * @fmt: The format string to use
2240 * @...: Arguments for the format string
2241 *
2242 * The function returns the number of words(u32) written
2243 * into @bin_buf.
2244 */
2245 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
2246 {
2247 va_list args;
2248 int ret;
2249
2250 va_start(args, fmt);
2251 ret = vbin_printf(bin_buf, size, fmt, args);
2252 va_end(args);
2253
2254 return ret;
2255 }
2256 EXPORT_SYMBOL_GPL(bprintf);
2257
2258 #endif /* CONFIG_BINARY_PRINTF */
2259
2260 /**
2261 * vsscanf - Unformat a buffer into a list of arguments
2262 * @buf: input buffer
2263 * @fmt: format of buffer
2264 * @args: arguments
2265 */
2266 int vsscanf(const char *buf, const char *fmt, va_list args)
2267 {
2268 const char *str = buf;
2269 char *next;
2270 char digit;
2271 int num = 0;
2272 u8 qualifier;
2273 unsigned int base;
2274 union {
2275 long long s;
2276 unsigned long long u;
2277 } val;
2278 s16 field_width;
2279 bool is_sign;
2280
2281 while (*fmt) {
2282 /* skip any white space in format */
2283 /* white space in format matchs any amount of
2284 * white space, including none, in the input.
2285 */
2286 if (isspace(*fmt)) {
2287 fmt = skip_spaces(++fmt);
2288 str = skip_spaces(str);
2289 }
2290
2291 /* anything that is not a conversion must match exactly */
2292 if (*fmt != '%' && *fmt) {
2293 if (*fmt++ != *str++)
2294 break;
2295 continue;
2296 }
2297
2298 if (!*fmt)
2299 break;
2300 ++fmt;
2301
2302 /* skip this conversion.
2303 * advance both strings to next white space
2304 */
2305 if (*fmt == '*') {
2306 if (!*str)
2307 break;
2308 while (!isspace(*fmt) && *fmt != '%' && *fmt)
2309 fmt++;
2310 while (!isspace(*str) && *str)
2311 str++;
2312 continue;
2313 }
2314
2315 /* get field width */
2316 field_width = -1;
2317 if (isdigit(*fmt)) {
2318 field_width = skip_atoi(&fmt);
2319 if (field_width <= 0)
2320 break;
2321 }
2322
2323 /* get conversion qualifier */
2324 qualifier = -1;
2325 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2326 _tolower(*fmt) == 'z') {
2327 qualifier = *fmt++;
2328 if (unlikely(qualifier == *fmt)) {
2329 if (qualifier == 'h') {
2330 qualifier = 'H';
2331 fmt++;
2332 } else if (qualifier == 'l') {
2333 qualifier = 'L';
2334 fmt++;
2335 }
2336 }
2337 }
2338
2339 if (!*fmt)
2340 break;
2341
2342 if (*fmt == 'n') {
2343 /* return number of characters read so far */
2344 *va_arg(args, int *) = str - buf;
2345 ++fmt;
2346 continue;
2347 }
2348
2349 if (!*str)
2350 break;
2351
2352 base = 10;
2353 is_sign = 0;
2354
2355 switch (*fmt++) {
2356 case 'c':
2357 {
2358 char *s = (char *)va_arg(args, char*);
2359 if (field_width == -1)
2360 field_width = 1;
2361 do {
2362 *s++ = *str++;
2363 } while (--field_width > 0 && *str);
2364 num++;
2365 }
2366 continue;
2367 case 's':
2368 {
2369 char *s = (char *)va_arg(args, char *);
2370 if (field_width == -1)
2371 field_width = SHRT_MAX;
2372 /* first, skip leading white space in buffer */
2373 str = skip_spaces(str);
2374
2375 /* now copy until next white space */
2376 while (*str && !isspace(*str) && field_width--)
2377 *s++ = *str++;
2378 *s = '\0';
2379 num++;
2380 }
2381 continue;
2382 case 'o':
2383 base = 8;
2384 break;
2385 case 'x':
2386 case 'X':
2387 base = 16;
2388 break;
2389 case 'i':
2390 base = 0;
2391 case 'd':
2392 is_sign = 1;
2393 case 'u':
2394 break;
2395 case '%':
2396 /* looking for '%' in str */
2397 if (*str++ != '%')
2398 return num;
2399 continue;
2400 default:
2401 /* invalid format; stop here */
2402 return num;
2403 }
2404
2405 /* have some sort of integer conversion.
2406 * first, skip white space in buffer.
2407 */
2408 str = skip_spaces(str);
2409
2410 digit = *str;
2411 if (is_sign && digit == '-')
2412 digit = *(str + 1);
2413
2414 if (!digit
2415 || (base == 16 && !isxdigit(digit))
2416 || (base == 10 && !isdigit(digit))
2417 || (base == 8 && (!isdigit(digit) || digit > '7'))
2418 || (base == 0 && !isdigit(digit)))
2419 break;
2420
2421 if (is_sign)
2422 val.s = qualifier != 'L' ?
2423 simple_strtol(str, &next, base) :
2424 simple_strtoll(str, &next, base);
2425 else
2426 val.u = qualifier != 'L' ?
2427 simple_strtoul(str, &next, base) :
2428 simple_strtoull(str, &next, base);
2429
2430 if (field_width > 0 && next - str > field_width) {
2431 if (base == 0)
2432 _parse_integer_fixup_radix(str, &base);
2433 while (next - str > field_width) {
2434 if (is_sign)
2435 val.s = div_s64(val.s, base);
2436 else
2437 val.u = div_u64(val.u, base);
2438 --next;
2439 }
2440 }
2441
2442 switch (qualifier) {
2443 case 'H': /* that's 'hh' in format */
2444 if (is_sign)
2445 *va_arg(args, signed char *) = val.s;
2446 else
2447 *va_arg(args, unsigned char *) = val.u;
2448 break;
2449 case 'h':
2450 if (is_sign)
2451 *va_arg(args, short *) = val.s;
2452 else
2453 *va_arg(args, unsigned short *) = val.u;
2454 break;
2455 case 'l':
2456 if (is_sign)
2457 *va_arg(args, long *) = val.s;
2458 else
2459 *va_arg(args, unsigned long *) = val.u;
2460 break;
2461 case 'L':
2462 if (is_sign)
2463 *va_arg(args, long long *) = val.s;
2464 else
2465 *va_arg(args, unsigned long long *) = val.u;
2466 break;
2467 case 'Z':
2468 case 'z':
2469 *va_arg(args, size_t *) = val.u;
2470 break;
2471 default:
2472 if (is_sign)
2473 *va_arg(args, int *) = val.s;
2474 else
2475 *va_arg(args, unsigned int *) = val.u;
2476 break;
2477 }
2478 num++;
2479
2480 if (!next)
2481 break;
2482 str = next;
2483 }
2484
2485 return num;
2486 }
2487 EXPORT_SYMBOL(vsscanf);
2488
2489 /**
2490 * sscanf - Unformat a buffer into a list of arguments
2491 * @buf: input buffer
2492 * @fmt: formatting of buffer
2493 * @...: resulting arguments
2494 */
2495 int sscanf(const char *buf, const char *fmt, ...)
2496 {
2497 va_list args;
2498 int i;
2499
2500 va_start(args, fmt);
2501 i = vsscanf(buf, fmt, args);
2502 va_end(args);
2503
2504 return i;
2505 }
2506 EXPORT_SYMBOL(sscanf);
Linux kernel - Deliverables
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