]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - lib/vsprintf.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge remote-tracking branches 'spi/fix/complete', 'spi/fix/efm32', 'spi/fix/omap2...
[mirror_ubuntu-artful-kernel.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44 * This function is obsolete.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69 * This function is obsolete.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 static noinline_for_stack
1159 char *address_val(char *buf, char *end, const void *addr,
1160 struct printf_spec spec, const char *fmt)
1161 {
1162 unsigned long long num;
1163
1164 spec.flags |= SPECIAL | SMALL | ZEROPAD;
1165 spec.base = 16;
1166
1167 switch (fmt[1]) {
1168 case 'd':
1169 num = *(const dma_addr_t *)addr;
1170 spec.field_width = sizeof(dma_addr_t) * 2 + 2;
1171 break;
1172 case 'p':
1173 default:
1174 num = *(const phys_addr_t *)addr;
1175 spec.field_width = sizeof(phys_addr_t) * 2 + 2;
1176 break;
1177 }
1178
1179 return number(buf, end, num, spec);
1180 }
1181
1182 int kptr_restrict __read_mostly;
1183
1184 /*
1185 * Show a '%p' thing. A kernel extension is that the '%p' is followed
1186 * by an extra set of alphanumeric characters that are extended format
1187 * specifiers.
1188 *
1189 * Right now we handle:
1190 *
1191 * - 'F' For symbolic function descriptor pointers with offset
1192 * - 'f' For simple symbolic function names without offset
1193 * - 'S' For symbolic direct pointers with offset
1194 * - 's' For symbolic direct pointers without offset
1195 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
1196 * - 'B' For backtraced symbolic direct pointers with offset
1197 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
1198 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
1199 * - 'M' For a 6-byte MAC address, it prints the address in the
1200 * usual colon-separated hex notation
1201 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
1202 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
1203 * with a dash-separated hex notation
1204 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
1205 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
1206 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
1207 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
1208 * [S][pfs]
1209 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1210 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1211 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
1212 * IPv6 omits the colons (01020304...0f)
1213 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
1214 * [S][pfs]
1215 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
1216 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
1217 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
1218 * - 'I[6S]c' for IPv6 addresses printed as specified by
1219 * http://tools.ietf.org/html/rfc5952
1220 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
1221 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
1222 * Options for %pU are:
1223 * b big endian lower case hex (default)
1224 * B big endian UPPER case hex
1225 * l little endian lower case hex
1226 * L little endian UPPER case hex
1227 * big endian output byte order is:
1228 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
1229 * little endian output byte order is:
1230 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
1231 * - 'V' For a struct va_format which contains a format string * and va_list *,
1232 * call vsnprintf(->format, *->va_list).
1233 * Implements a "recursive vsnprintf".
1234 * Do not use this feature without some mechanism to verify the
1235 * correctness of the format string and va_list arguments.
1236 * - 'K' For a kernel pointer that should be hidden from unprivileged users
1237 * - 'NF' For a netdev_features_t
1238 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
1239 * a certain separator (' ' by default):
1240 * C colon
1241 * D dash
1242 * N no separator
1243 * The maximum supported length is 64 bytes of the input. Consider
1244 * to use print_hex_dump() for the larger input.
1245 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
1246 * (default assumed to be phys_addr_t, passed by reference)
1247 * - 'd[234]' For a dentry name (optionally 2-4 last components)
1248 * - 'D[234]' Same as 'd' but for a struct file
1249 *
1250 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
1251 * function pointers are really function descriptors, which contain a
1252 * pointer to the real address.
1253 */
1254 static noinline_for_stack
1255 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
1256 struct printf_spec spec)
1257 {
1258 int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
1259
1260 if (!ptr && *fmt != 'K') {
1261 /*
1262 * Print (null) with the same width as a pointer so it makes
1263 * tabular output look nice.
1264 */
1265 if (spec.field_width == -1)
1266 spec.field_width = default_width;
1267 return string(buf, end, "(null)", spec);
1268 }
1269
1270 switch (*fmt) {
1271 case 'F':
1272 case 'f':
1273 ptr = dereference_function_descriptor(ptr);
1274 /* Fallthrough */
1275 case 'S':
1276 case 's':
1277 case 'B':
1278 return symbol_string(buf, end, ptr, spec, fmt);
1279 case 'R':
1280 case 'r':
1281 return resource_string(buf, end, ptr, spec, fmt);
1282 case 'h':
1283 return hex_string(buf, end, ptr, spec, fmt);
1284 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1285 case 'm': /* Contiguous: 000102030405 */
1286 /* [mM]F (FDDI) */
1287 /* [mM]R (Reverse order; Bluetooth) */
1288 return mac_address_string(buf, end, ptr, spec, fmt);
1289 case 'I': /* Formatted IP supported
1290 * 4: 1.2.3.4
1291 * 6: 0001:0203:...:0708
1292 * 6c: 1::708 or 1::1.2.3.4
1293 */
1294 case 'i': /* Contiguous:
1295 * 4: 001.002.003.004
1296 * 6: 000102...0f
1297 */
1298 switch (fmt[1]) {
1299 case '6':
1300 return ip6_addr_string(buf, end, ptr, spec, fmt);
1301 case '4':
1302 return ip4_addr_string(buf, end, ptr, spec, fmt);
1303 case 'S': {
1304 const union {
1305 struct sockaddr raw;
1306 struct sockaddr_in v4;
1307 struct sockaddr_in6 v6;
1308 } *sa = ptr;
1309
1310 switch (sa->raw.sa_family) {
1311 case AF_INET:
1312 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
1313 case AF_INET6:
1314 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
1315 default:
1316 return string(buf, end, "(invalid address)", spec);
1317 }}
1318 }
1319 break;
1320 case 'U':
1321 return uuid_string(buf, end, ptr, spec, fmt);
1322 case 'V':
1323 {
1324 va_list va;
1325
1326 va_copy(va, *((struct va_format *)ptr)->va);
1327 buf += vsnprintf(buf, end > buf ? end - buf : 0,
1328 ((struct va_format *)ptr)->fmt, va);
1329 va_end(va);
1330 return buf;
1331 }
1332 case 'K':
1333 /*
1334 * %pK cannot be used in IRQ context because its test
1335 * for CAP_SYSLOG would be meaningless.
1336 */
1337 if (kptr_restrict && (in_irq() || in_serving_softirq() ||
1338 in_nmi())) {
1339 if (spec.field_width == -1)
1340 spec.field_width = default_width;
1341 return string(buf, end, "pK-error", spec);
1342 }
1343
1344 switch (kptr_restrict) {
1345 case 0:
1346 /* Always print %pK values */
1347 break;
1348 case 1: {
1349 /*
1350 * Only print the real pointer value if the current
1351 * process has CAP_SYSLOG and is running with the
1352 * same credentials it started with. This is because
1353 * access to files is checked at open() time, but %pK
1354 * checks permission at read() time. We don't want to
1355 * leak pointer values if a binary opens a file using
1356 * %pK and then elevates privileges before reading it.
1357 */
1358 const struct cred *cred = current_cred();
1359
1360 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
1361 !uid_eq(cred->euid, cred->uid) ||
1362 !gid_eq(cred->egid, cred->gid))
1363 ptr = NULL;
1364 break;
1365 }
1366 case 2:
1367 default:
1368 /* Always print 0's for %pK */
1369 ptr = NULL;
1370 break;
1371 }
1372 break;
1373
1374 case 'N':
1375 switch (fmt[1]) {
1376 case 'F':
1377 return netdev_feature_string(buf, end, ptr, spec);
1378 }
1379 break;
1380 case 'a':
1381 return address_val(buf, end, ptr, spec, fmt);
1382 case 'd':
1383 return dentry_name(buf, end, ptr, spec, fmt);
1384 case 'D':
1385 return dentry_name(buf, end,
1386 ((const struct file *)ptr)->f_path.dentry,
1387 spec, fmt);
1388 }
1389 spec.flags |= SMALL;
1390 if (spec.field_width == -1) {
1391 spec.field_width = default_width;
1392 spec.flags |= ZEROPAD;
1393 }
1394 spec.base = 16;
1395
1396 return number(buf, end, (unsigned long) ptr, spec);
1397 }
1398
1399 /*
1400 * Helper function to decode printf style format.
1401 * Each call decode a token from the format and return the
1402 * number of characters read (or likely the delta where it wants
1403 * to go on the next call).
1404 * The decoded token is returned through the parameters
1405 *
1406 * 'h', 'l', or 'L' for integer fields
1407 * 'z' support added 23/7/1999 S.H.
1408 * 'z' changed to 'Z' --davidm 1/25/99
1409 * 't' added for ptrdiff_t
1410 *
1411 * @fmt: the format string
1412 * @type of the token returned
1413 * @flags: various flags such as +, -, # tokens..
1414 * @field_width: overwritten width
1415 * @base: base of the number (octal, hex, ...)
1416 * @precision: precision of a number
1417 * @qualifier: qualifier of a number (long, size_t, ...)
1418 */
1419 static noinline_for_stack
1420 int format_decode(const char *fmt, struct printf_spec *spec)
1421 {
1422 const char *start = fmt;
1423
1424 /* we finished early by reading the field width */
1425 if (spec->type == FORMAT_TYPE_WIDTH) {
1426 if (spec->field_width < 0) {
1427 spec->field_width = -spec->field_width;
1428 spec->flags |= LEFT;
1429 }
1430 spec->type = FORMAT_TYPE_NONE;
1431 goto precision;
1432 }
1433
1434 /* we finished early by reading the precision */
1435 if (spec->type == FORMAT_TYPE_PRECISION) {
1436 if (spec->precision < 0)
1437 spec->precision = 0;
1438
1439 spec->type = FORMAT_TYPE_NONE;
1440 goto qualifier;
1441 }
1442
1443 /* By default */
1444 spec->type = FORMAT_TYPE_NONE;
1445
1446 for (; *fmt ; ++fmt) {
1447 if (*fmt == '%')
1448 break;
1449 }
1450
1451 /* Return the current non-format string */
1452 if (fmt != start || !*fmt)
1453 return fmt - start;
1454
1455 /* Process flags */
1456 spec->flags = 0;
1457
1458 while (1) { /* this also skips first '%' */
1459 bool found = true;
1460
1461 ++fmt;
1462
1463 switch (*fmt) {
1464 case '-': spec->flags |= LEFT; break;
1465 case '+': spec->flags |= PLUS; break;
1466 case ' ': spec->flags |= SPACE; break;
1467 case '#': spec->flags |= SPECIAL; break;
1468 case '0': spec->flags |= ZEROPAD; break;
1469 default: found = false;
1470 }
1471
1472 if (!found)
1473 break;
1474 }
1475
1476 /* get field width */
1477 spec->field_width = -1;
1478
1479 if (isdigit(*fmt))
1480 spec->field_width = skip_atoi(&fmt);
1481 else if (*fmt == '*') {
1482 /* it's the next argument */
1483 spec->type = FORMAT_TYPE_WIDTH;
1484 return ++fmt - start;
1485 }
1486
1487 precision:
1488 /* get the precision */
1489 spec->precision = -1;
1490 if (*fmt == '.') {
1491 ++fmt;
1492 if (isdigit(*fmt)) {
1493 spec->precision = skip_atoi(&fmt);
1494 if (spec->precision < 0)
1495 spec->precision = 0;
1496 } else if (*fmt == '*') {
1497 /* it's the next argument */
1498 spec->type = FORMAT_TYPE_PRECISION;
1499 return ++fmt - start;
1500 }
1501 }
1502
1503 qualifier:
1504 /* get the conversion qualifier */
1505 spec->qualifier = -1;
1506 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1507 _tolower(*fmt) == 'z' || *fmt == 't') {
1508 spec->qualifier = *fmt++;
1509 if (unlikely(spec->qualifier == *fmt)) {
1510 if (spec->qualifier == 'l') {
1511 spec->qualifier = 'L';
1512 ++fmt;
1513 } else if (spec->qualifier == 'h') {
1514 spec->qualifier = 'H';
1515 ++fmt;
1516 }
1517 }
1518 }
1519
1520 /* default base */
1521 spec->base = 10;
1522 switch (*fmt) {
1523 case 'c':
1524 spec->type = FORMAT_TYPE_CHAR;
1525 return ++fmt - start;
1526
1527 case 's':
1528 spec->type = FORMAT_TYPE_STR;
1529 return ++fmt - start;
1530
1531 case 'p':
1532 spec->type = FORMAT_TYPE_PTR;
1533 return fmt - start;
1534 /* skip alnum */
1535
1536 case 'n':
1537 spec->type = FORMAT_TYPE_NRCHARS;
1538 return ++fmt - start;
1539
1540 case '%':
1541 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1542 return ++fmt - start;
1543
1544 /* integer number formats - set up the flags and "break" */
1545 case 'o':
1546 spec->base = 8;
1547 break;
1548
1549 case 'x':
1550 spec->flags |= SMALL;
1551
1552 case 'X':
1553 spec->base = 16;
1554 break;
1555
1556 case 'd':
1557 case 'i':
1558 spec->flags |= SIGN;
1559 case 'u':
1560 break;
1561
1562 default:
1563 spec->type = FORMAT_TYPE_INVALID;
1564 return fmt - start;
1565 }
1566
1567 if (spec->qualifier == 'L')
1568 spec->type = FORMAT_TYPE_LONG_LONG;
1569 else if (spec->qualifier == 'l') {
1570 if (spec->flags & SIGN)
1571 spec->type = FORMAT_TYPE_LONG;
1572 else
1573 spec->type = FORMAT_TYPE_ULONG;
1574 } else if (_tolower(spec->qualifier) == 'z') {
1575 spec->type = FORMAT_TYPE_SIZE_T;
1576 } else if (spec->qualifier == 't') {
1577 spec->type = FORMAT_TYPE_PTRDIFF;
1578 } else if (spec->qualifier == 'H') {
1579 if (spec->flags & SIGN)
1580 spec->type = FORMAT_TYPE_BYTE;
1581 else
1582 spec->type = FORMAT_TYPE_UBYTE;
1583 } else if (spec->qualifier == 'h') {
1584 if (spec->flags & SIGN)
1585 spec->type = FORMAT_TYPE_SHORT;
1586 else
1587 spec->type = FORMAT_TYPE_USHORT;
1588 } else {
1589 if (spec->flags & SIGN)
1590 spec->type = FORMAT_TYPE_INT;
1591 else
1592 spec->type = FORMAT_TYPE_UINT;
1593 }
1594
1595 return ++fmt - start;
1596 }
1597
1598 /**
1599 * vsnprintf - Format a string and place it in a buffer
1600 * @buf: The buffer to place the result into
1601 * @size: The size of the buffer, including the trailing null space
1602 * @fmt: The format string to use
1603 * @args: Arguments for the format string
1604 *
1605 * This function follows C99 vsnprintf, but has some extensions:
1606 * %pS output the name of a text symbol with offset
1607 * %ps output the name of a text symbol without offset
1608 * %pF output the name of a function pointer with its offset
1609 * %pf output the name of a function pointer without its offset
1610 * %pB output the name of a backtrace symbol with its offset
1611 * %pR output the address range in a struct resource with decoded flags
1612 * %pr output the address range in a struct resource with raw flags
1613 * %pM output a 6-byte MAC address with colons
1614 * %pMR output a 6-byte MAC address with colons in reversed order
1615 * %pMF output a 6-byte MAC address with dashes
1616 * %pm output a 6-byte MAC address without colons
1617 * %pmR output a 6-byte MAC address without colons in reversed order
1618 * %pI4 print an IPv4 address without leading zeros
1619 * %pi4 print an IPv4 address with leading zeros
1620 * %pI6 print an IPv6 address with colons
1621 * %pi6 print an IPv6 address without colons
1622 * %pI6c print an IPv6 address as specified by RFC 5952
1623 * %pIS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
1624 * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
1625 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1626 * case.
1627 * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
1628 * bytes of the input)
1629 * %n is ignored
1630 *
1631 * ** Please update Documentation/printk-formats.txt when making changes **
1632 *
1633 * The return value is the number of characters which would
1634 * be generated for the given input, excluding the trailing
1635 * '\0', as per ISO C99. If you want to have the exact
1636 * number of characters written into @buf as return value
1637 * (not including the trailing '\0'), use vscnprintf(). If the
1638 * return is greater than or equal to @size, the resulting
1639 * string is truncated.
1640 *
1641 * If you're not already dealing with a va_list consider using snprintf().
1642 */
1643 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1644 {
1645 unsigned long long num;
1646 char *str, *end;
1647 struct printf_spec spec = {0};
1648
1649 /* Reject out-of-range values early. Large positive sizes are
1650 used for unknown buffer sizes. */
1651 if (WARN_ON_ONCE((int) size < 0))
1652 return 0;
1653
1654 str = buf;
1655 end = buf + size;
1656
1657 /* Make sure end is always >= buf */
1658 if (end < buf) {
1659 end = ((void *)-1);
1660 size = end - buf;
1661 }
1662
1663 while (*fmt) {
1664 const char *old_fmt = fmt;
1665 int read = format_decode(fmt, &spec);
1666
1667 fmt += read;
1668
1669 switch (spec.type) {
1670 case FORMAT_TYPE_NONE: {
1671 int copy = read;
1672 if (str < end) {
1673 if (copy > end - str)
1674 copy = end - str;
1675 memcpy(str, old_fmt, copy);
1676 }
1677 str += read;
1678 break;
1679 }
1680
1681 case FORMAT_TYPE_WIDTH:
1682 spec.field_width = va_arg(args, int);
1683 break;
1684
1685 case FORMAT_TYPE_PRECISION:
1686 spec.precision = va_arg(args, int);
1687 break;
1688
1689 case FORMAT_TYPE_CHAR: {
1690 char c;
1691
1692 if (!(spec.flags & LEFT)) {
1693 while (--spec.field_width > 0) {
1694 if (str < end)
1695 *str = ' ';
1696 ++str;
1697
1698 }
1699 }
1700 c = (unsigned char) va_arg(args, int);
1701 if (str < end)
1702 *str = c;
1703 ++str;
1704 while (--spec.field_width > 0) {
1705 if (str < end)
1706 *str = ' ';
1707 ++str;
1708 }
1709 break;
1710 }
1711
1712 case FORMAT_TYPE_STR:
1713 str = string(str, end, va_arg(args, char *), spec);
1714 break;
1715
1716 case FORMAT_TYPE_PTR:
1717 str = pointer(fmt+1, str, end, va_arg(args, void *),
1718 spec);
1719 while (isalnum(*fmt))
1720 fmt++;
1721 break;
1722
1723 case FORMAT_TYPE_PERCENT_CHAR:
1724 if (str < end)
1725 *str = '%';
1726 ++str;
1727 break;
1728
1729 case FORMAT_TYPE_INVALID:
1730 if (str < end)
1731 *str = '%';
1732 ++str;
1733 break;
1734
1735 case FORMAT_TYPE_NRCHARS: {
1736 /*
1737 * Since %n poses a greater security risk than
1738 * utility, ignore %n and skip its argument.
1739 */
1740 void *skip_arg;
1741
1742 WARN_ONCE(1, "Please remove ignored %%n in '%s'\n",
1743 old_fmt);
1744
1745 skip_arg = va_arg(args, void *);
1746 break;
1747 }
1748
1749 default:
1750 switch (spec.type) {
1751 case FORMAT_TYPE_LONG_LONG:
1752 num = va_arg(args, long long);
1753 break;
1754 case FORMAT_TYPE_ULONG:
1755 num = va_arg(args, unsigned long);
1756 break;
1757 case FORMAT_TYPE_LONG:
1758 num = va_arg(args, long);
1759 break;
1760 case FORMAT_TYPE_SIZE_T:
1761 if (spec.flags & SIGN)
1762 num = va_arg(args, ssize_t);
1763 else
1764 num = va_arg(args, size_t);
1765 break;
1766 case FORMAT_TYPE_PTRDIFF:
1767 num = va_arg(args, ptrdiff_t);
1768 break;
1769 case FORMAT_TYPE_UBYTE:
1770 num = (unsigned char) va_arg(args, int);
1771 break;
1772 case FORMAT_TYPE_BYTE:
1773 num = (signed char) va_arg(args, int);
1774 break;
1775 case FORMAT_TYPE_USHORT:
1776 num = (unsigned short) va_arg(args, int);
1777 break;
1778 case FORMAT_TYPE_SHORT:
1779 num = (short) va_arg(args, int);
1780 break;
1781 case FORMAT_TYPE_INT:
1782 num = (int) va_arg(args, int);
1783 break;
1784 default:
1785 num = va_arg(args, unsigned int);
1786 }
1787
1788 str = number(str, end, num, spec);
1789 }
1790 }
1791
1792 if (size > 0) {
1793 if (str < end)
1794 *str = '\0';
1795 else
1796 end[-1] = '\0';
1797 }
1798
1799 /* the trailing null byte doesn't count towards the total */
1800 return str-buf;
1801
1802 }
1803 EXPORT_SYMBOL(vsnprintf);
1804
1805 /**
1806 * vscnprintf - Format a string and place it in a buffer
1807 * @buf: The buffer to place the result into
1808 * @size: The size of the buffer, including the trailing null space
1809 * @fmt: The format string to use
1810 * @args: Arguments for the format string
1811 *
1812 * The return value is the number of characters which have been written into
1813 * the @buf not including the trailing '\0'. If @size is == 0 the function
1814 * returns 0.
1815 *
1816 * If you're not already dealing with a va_list consider using scnprintf().
1817 *
1818 * See the vsnprintf() documentation for format string extensions over C99.
1819 */
1820 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1821 {
1822 int i;
1823
1824 i = vsnprintf(buf, size, fmt, args);
1825
1826 if (likely(i < size))
1827 return i;
1828 if (size != 0)
1829 return size - 1;
1830 return 0;
1831 }
1832 EXPORT_SYMBOL(vscnprintf);
1833
1834 /**
1835 * snprintf - Format a string and place it in a buffer
1836 * @buf: The buffer to place the result into
1837 * @size: The size of the buffer, including the trailing null space
1838 * @fmt: The format string to use
1839 * @...: Arguments for the format string
1840 *
1841 * The return value is the number of characters which would be
1842 * generated for the given input, excluding the trailing null,
1843 * as per ISO C99. If the return is greater than or equal to
1844 * @size, the resulting string is truncated.
1845 *
1846 * See the vsnprintf() documentation for format string extensions over C99.
1847 */
1848 int snprintf(char *buf, size_t size, const char *fmt, ...)
1849 {
1850 va_list args;
1851 int i;
1852
1853 va_start(args, fmt);
1854 i = vsnprintf(buf, size, fmt, args);
1855 va_end(args);
1856
1857 return i;
1858 }
1859 EXPORT_SYMBOL(snprintf);
1860
1861 /**
1862 * scnprintf - Format a string and place it in a buffer
1863 * @buf: The buffer to place the result into
1864 * @size: The size of the buffer, including the trailing null space
1865 * @fmt: The format string to use
1866 * @...: Arguments for the format string
1867 *
1868 * The return value is the number of characters written into @buf not including
1869 * the trailing '\0'. If @size is == 0 the function returns 0.
1870 */
1871
1872 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1873 {
1874 va_list args;
1875 int i;
1876
1877 va_start(args, fmt);
1878 i = vscnprintf(buf, size, fmt, args);
1879 va_end(args);
1880
1881 return i;
1882 }
1883 EXPORT_SYMBOL(scnprintf);
1884
1885 /**
1886 * vsprintf - Format a string and place it in a buffer
1887 * @buf: The buffer to place the result into
1888 * @fmt: The format string to use
1889 * @args: Arguments for the format string
1890 *
1891 * The function returns the number of characters written
1892 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1893 * buffer overflows.
1894 *
1895 * If you're not already dealing with a va_list consider using sprintf().
1896 *
1897 * See the vsnprintf() documentation for format string extensions over C99.
1898 */
1899 int vsprintf(char *buf, const char *fmt, va_list args)
1900 {
1901 return vsnprintf(buf, INT_MAX, fmt, args);
1902 }
1903 EXPORT_SYMBOL(vsprintf);
1904
1905 /**
1906 * sprintf - Format a string and place it in a buffer
1907 * @buf: The buffer to place the result into
1908 * @fmt: The format string to use
1909 * @...: Arguments for the format string
1910 *
1911 * The function returns the number of characters written
1912 * into @buf. Use snprintf() or scnprintf() in order to avoid
1913 * buffer overflows.
1914 *
1915 * See the vsnprintf() documentation for format string extensions over C99.
1916 */
1917 int sprintf(char *buf, const char *fmt, ...)
1918 {
1919 va_list args;
1920 int i;
1921
1922 va_start(args, fmt);
1923 i = vsnprintf(buf, INT_MAX, fmt, args);
1924 va_end(args);
1925
1926 return i;
1927 }
1928 EXPORT_SYMBOL(sprintf);
1929
1930 #ifdef CONFIG_BINARY_PRINTF
1931 /*
1932 * bprintf service:
1933 * vbin_printf() - VA arguments to binary data
1934 * bstr_printf() - Binary data to text string
1935 */
1936
1937 /**
1938 * vbin_printf - Parse a format string and place args' binary value in a buffer
1939 * @bin_buf: The buffer to place args' binary value
1940 * @size: The size of the buffer(by words(32bits), not characters)
1941 * @fmt: The format string to use
1942 * @args: Arguments for the format string
1943 *
1944 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1945 * is skiped.
1946 *
1947 * The return value is the number of words(32bits) which would be generated for
1948 * the given input.
1949 *
1950 * NOTE:
1951 * If the return value is greater than @size, the resulting bin_buf is NOT
1952 * valid for bstr_printf().
1953 */
1954 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1955 {
1956 struct printf_spec spec = {0};
1957 char *str, *end;
1958
1959 str = (char *)bin_buf;
1960 end = (char *)(bin_buf + size);
1961
1962 #define save_arg(type) \
1963 do { \
1964 if (sizeof(type) == 8) { \
1965 unsigned long long value; \
1966 str = PTR_ALIGN(str, sizeof(u32)); \
1967 value = va_arg(args, unsigned long long); \
1968 if (str + sizeof(type) <= end) { \
1969 *(u32 *)str = *(u32 *)&value; \
1970 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1971 } \
1972 } else { \
1973 unsigned long value; \
1974 str = PTR_ALIGN(str, sizeof(type)); \
1975 value = va_arg(args, int); \
1976 if (str + sizeof(type) <= end) \
1977 *(typeof(type) *)str = (type)value; \
1978 } \
1979 str += sizeof(type); \
1980 } while (0)
1981
1982 while (*fmt) {
1983 int read = format_decode(fmt, &spec);
1984
1985 fmt += read;
1986
1987 switch (spec.type) {
1988 case FORMAT_TYPE_NONE:
1989 case FORMAT_TYPE_INVALID:
1990 case FORMAT_TYPE_PERCENT_CHAR:
1991 break;
1992
1993 case FORMAT_TYPE_WIDTH:
1994 case FORMAT_TYPE_PRECISION:
1995 save_arg(int);
1996 break;
1997
1998 case FORMAT_TYPE_CHAR:
1999 save_arg(char);
2000 break;
2001
2002 case FORMAT_TYPE_STR: {
2003 const char *save_str = va_arg(args, char *);
2004 size_t len;
2005
2006 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
2007 || (unsigned long)save_str < PAGE_SIZE)
2008 save_str = "(null)";
2009 len = strlen(save_str) + 1;
2010 if (str + len < end)
2011 memcpy(str, save_str, len);
2012 str += len;
2013 break;
2014 }
2015
2016 case FORMAT_TYPE_PTR:
2017 save_arg(void *);
2018 /* skip all alphanumeric pointer suffixes */
2019 while (isalnum(*fmt))
2020 fmt++;
2021 break;
2022
2023 case FORMAT_TYPE_NRCHARS: {
2024 /* skip %n 's argument */
2025 u8 qualifier = spec.qualifier;
2026 void *skip_arg;
2027 if (qualifier == 'l')
2028 skip_arg = va_arg(args, long *);
2029 else if (_tolower(qualifier) == 'z')
2030 skip_arg = va_arg(args, size_t *);
2031 else
2032 skip_arg = va_arg(args, int *);
2033 break;
2034 }
2035
2036 default:
2037 switch (spec.type) {
2038
2039 case FORMAT_TYPE_LONG_LONG:
2040 save_arg(long long);
2041 break;
2042 case FORMAT_TYPE_ULONG:
2043 case FORMAT_TYPE_LONG:
2044 save_arg(unsigned long);
2045 break;
2046 case FORMAT_TYPE_SIZE_T:
2047 save_arg(size_t);
2048 break;
2049 case FORMAT_TYPE_PTRDIFF:
2050 save_arg(ptrdiff_t);
2051 break;
2052 case FORMAT_TYPE_UBYTE:
2053 case FORMAT_TYPE_BYTE:
2054 save_arg(char);
2055 break;
2056 case FORMAT_TYPE_USHORT:
2057 case FORMAT_TYPE_SHORT:
2058 save_arg(short);
2059 break;
2060 default:
2061 save_arg(int);
2062 }
2063 }
2064 }
2065
2066 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
2067 #undef save_arg
2068 }
2069 EXPORT_SYMBOL_GPL(vbin_printf);
2070
2071 /**
2072 * bstr_printf - Format a string from binary arguments and place it in a buffer
2073 * @buf: The buffer to place the result into
2074 * @size: The size of the buffer, including the trailing null space
2075 * @fmt: The format string to use
2076 * @bin_buf: Binary arguments for the format string
2077 *
2078 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
2079 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
2080 * a binary buffer that generated by vbin_printf.
2081 *
2082 * The format follows C99 vsnprintf, but has some extensions:
2083 * see vsnprintf comment for details.
2084 *
2085 * The return value is the number of characters which would
2086 * be generated for the given input, excluding the trailing
2087 * '\0', as per ISO C99. If you want to have the exact
2088 * number of characters written into @buf as return value
2089 * (not including the trailing '\0'), use vscnprintf(). If the
2090 * return is greater than or equal to @size, the resulting
2091 * string is truncated.
2092 */
2093 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
2094 {
2095 struct printf_spec spec = {0};
2096 char *str, *end;
2097 const char *args = (const char *)bin_buf;
2098
2099 if (WARN_ON_ONCE((int) size < 0))
2100 return 0;
2101
2102 str = buf;
2103 end = buf + size;
2104
2105 #define get_arg(type) \
2106 ({ \
2107 typeof(type) value; \
2108 if (sizeof(type) == 8) { \
2109 args = PTR_ALIGN(args, sizeof(u32)); \
2110 *(u32 *)&value = *(u32 *)args; \
2111 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
2112 } else { \
2113 args = PTR_ALIGN(args, sizeof(type)); \
2114 value = *(typeof(type) *)args; \
2115 } \
2116 args += sizeof(type); \
2117 value; \
2118 })
2119
2120 /* Make sure end is always >= buf */
2121 if (end < buf) {
2122 end = ((void *)-1);
2123 size = end - buf;
2124 }
2125
2126 while (*fmt) {
2127 const char *old_fmt = fmt;
2128 int read = format_decode(fmt, &spec);
2129
2130 fmt += read;
2131
2132 switch (spec.type) {
2133 case FORMAT_TYPE_NONE: {
2134 int copy = read;
2135 if (str < end) {
2136 if (copy > end - str)
2137 copy = end - str;
2138 memcpy(str, old_fmt, copy);
2139 }
2140 str += read;
2141 break;
2142 }
2143
2144 case FORMAT_TYPE_WIDTH:
2145 spec.field_width = get_arg(int);
2146 break;
2147
2148 case FORMAT_TYPE_PRECISION:
2149 spec.precision = get_arg(int);
2150 break;
2151
2152 case FORMAT_TYPE_CHAR: {
2153 char c;
2154
2155 if (!(spec.flags & LEFT)) {
2156 while (--spec.field_width > 0) {
2157 if (str < end)
2158 *str = ' ';
2159 ++str;
2160 }
2161 }
2162 c = (unsigned char) get_arg(char);
2163 if (str < end)
2164 *str = c;
2165 ++str;
2166 while (--spec.field_width > 0) {
2167 if (str < end)
2168 *str = ' ';
2169 ++str;
2170 }
2171 break;
2172 }
2173
2174 case FORMAT_TYPE_STR: {
2175 const char *str_arg = args;
2176 args += strlen(str_arg) + 1;
2177 str = string(str, end, (char *)str_arg, spec);
2178 break;
2179 }
2180
2181 case FORMAT_TYPE_PTR:
2182 str = pointer(fmt+1, str, end, get_arg(void *), spec);
2183 while (isalnum(*fmt))
2184 fmt++;
2185 break;
2186
2187 case FORMAT_TYPE_PERCENT_CHAR:
2188 case FORMAT_TYPE_INVALID:
2189 if (str < end)
2190 *str = '%';
2191 ++str;
2192 break;
2193
2194 case FORMAT_TYPE_NRCHARS:
2195 /* skip */
2196 break;
2197
2198 default: {
2199 unsigned long long num;
2200
2201 switch (spec.type) {
2202
2203 case FORMAT_TYPE_LONG_LONG:
2204 num = get_arg(long long);
2205 break;
2206 case FORMAT_TYPE_ULONG:
2207 case FORMAT_TYPE_LONG:
2208 num = get_arg(unsigned long);
2209 break;
2210 case FORMAT_TYPE_SIZE_T:
2211 num = get_arg(size_t);
2212 break;
2213 case FORMAT_TYPE_PTRDIFF:
2214 num = get_arg(ptrdiff_t);
2215 break;
2216 case FORMAT_TYPE_UBYTE:
2217 num = get_arg(unsigned char);
2218 break;
2219 case FORMAT_TYPE_BYTE:
2220 num = get_arg(signed char);
2221 break;
2222 case FORMAT_TYPE_USHORT:
2223 num = get_arg(unsigned short);
2224 break;
2225 case FORMAT_TYPE_SHORT:
2226 num = get_arg(short);
2227 break;
2228 case FORMAT_TYPE_UINT:
2229 num = get_arg(unsigned int);
2230 break;
2231 default:
2232 num = get_arg(int);
2233 }
2234
2235 str = number(str, end, num, spec);
2236 } /* default: */
2237 } /* switch(spec.type) */
2238 } /* while(*fmt) */
2239
2240 if (size > 0) {
2241 if (str < end)
2242 *str = '\0';
2243 else
2244 end[-1] = '\0';
2245 }
2246
2247 #undef get_arg
2248
2249 /* the trailing null byte doesn't count towards the total */
2250 return str - buf;
2251 }
2252 EXPORT_SYMBOL_GPL(bstr_printf);
2253
2254 /**
2255 * bprintf - Parse a format string and place args' binary value in a buffer
2256 * @bin_buf: The buffer to place args' binary value
2257 * @size: The size of the buffer(by words(32bits), not characters)
2258 * @fmt: The format string to use
2259 * @...: Arguments for the format string
2260 *
2261 * The function returns the number of words(u32) written
2262 * into @bin_buf.
2263 */
2264 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
2265 {
2266 va_list args;
2267 int ret;
2268
2269 va_start(args, fmt);
2270 ret = vbin_printf(bin_buf, size, fmt, args);
2271 va_end(args);
2272
2273 return ret;
2274 }
2275 EXPORT_SYMBOL_GPL(bprintf);
2276
2277 #endif /* CONFIG_BINARY_PRINTF */
2278
2279 /**
2280 * vsscanf - Unformat a buffer into a list of arguments
2281 * @buf: input buffer
2282 * @fmt: format of buffer
2283 * @args: arguments
2284 */
2285 int vsscanf(const char *buf, const char *fmt, va_list args)
2286 {
2287 const char *str = buf;
2288 char *next;
2289 char digit;
2290 int num = 0;
2291 u8 qualifier;
2292 unsigned int base;
2293 union {
2294 long long s;
2295 unsigned long long u;
2296 } val;
2297 s16 field_width;
2298 bool is_sign;
2299
2300 while (*fmt) {
2301 /* skip any white space in format */
2302 /* white space in format matchs any amount of
2303 * white space, including none, in the input.
2304 */
2305 if (isspace(*fmt)) {
2306 fmt = skip_spaces(++fmt);
2307 str = skip_spaces(str);
2308 }
2309
2310 /* anything that is not a conversion must match exactly */
2311 if (*fmt != '%' && *fmt) {
2312 if (*fmt++ != *str++)
2313 break;
2314 continue;
2315 }
2316
2317 if (!*fmt)
2318 break;
2319 ++fmt;
2320
2321 /* skip this conversion.
2322 * advance both strings to next white space
2323 */
2324 if (*fmt == '*') {
2325 if (!*str)
2326 break;
2327 while (!isspace(*fmt) && *fmt != '%' && *fmt)
2328 fmt++;
2329 while (!isspace(*str) && *str)
2330 str++;
2331 continue;
2332 }
2333
2334 /* get field width */
2335 field_width = -1;
2336 if (isdigit(*fmt)) {
2337 field_width = skip_atoi(&fmt);
2338 if (field_width <= 0)
2339 break;
2340 }
2341
2342 /* get conversion qualifier */
2343 qualifier = -1;
2344 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2345 _tolower(*fmt) == 'z') {
2346 qualifier = *fmt++;
2347 if (unlikely(qualifier == *fmt)) {
2348 if (qualifier == 'h') {
2349 qualifier = 'H';
2350 fmt++;
2351 } else if (qualifier == 'l') {
2352 qualifier = 'L';
2353 fmt++;
2354 }
2355 }
2356 }
2357
2358 if (!*fmt)
2359 break;
2360
2361 if (*fmt == 'n') {
2362 /* return number of characters read so far */
2363 *va_arg(args, int *) = str - buf;
2364 ++fmt;
2365 continue;
2366 }
2367
2368 if (!*str)
2369 break;
2370
2371 base = 10;
2372 is_sign = 0;
2373
2374 switch (*fmt++) {
2375 case 'c':
2376 {
2377 char *s = (char *)va_arg(args, char*);
2378 if (field_width == -1)
2379 field_width = 1;
2380 do {
2381 *s++ = *str++;
2382 } while (--field_width > 0 && *str);
2383 num++;
2384 }
2385 continue;
2386 case 's':
2387 {
2388 char *s = (char *)va_arg(args, char *);
2389 if (field_width == -1)
2390 field_width = SHRT_MAX;
2391 /* first, skip leading white space in buffer */
2392 str = skip_spaces(str);
2393
2394 /* now copy until next white space */
2395 while (*str && !isspace(*str) && field_width--)
2396 *s++ = *str++;
2397 *s = '\0';
2398 num++;
2399 }
2400 continue;
2401 case 'o':
2402 base = 8;
2403 break;
2404 case 'x':
2405 case 'X':
2406 base = 16;
2407 break;
2408 case 'i':
2409 base = 0;
2410 case 'd':
2411 is_sign = 1;
2412 case 'u':
2413 break;
2414 case '%':
2415 /* looking for '%' in str */
2416 if (*str++ != '%')
2417 return num;
2418 continue;
2419 default:
2420 /* invalid format; stop here */
2421 return num;
2422 }
2423
2424 /* have some sort of integer conversion.
2425 * first, skip white space in buffer.
2426 */
2427 str = skip_spaces(str);
2428
2429 digit = *str;
2430 if (is_sign && digit == '-')
2431 digit = *(str + 1);
2432
2433 if (!digit
2434 || (base == 16 && !isxdigit(digit))
2435 || (base == 10 && !isdigit(digit))
2436 || (base == 8 && (!isdigit(digit) || digit > '7'))
2437 || (base == 0 && !isdigit(digit)))
2438 break;
2439
2440 if (is_sign)
2441 val.s = qualifier != 'L' ?
2442 simple_strtol(str, &next, base) :
2443 simple_strtoll(str, &next, base);
2444 else
2445 val.u = qualifier != 'L' ?
2446 simple_strtoul(str, &next, base) :
2447 simple_strtoull(str, &next, base);
2448
2449 if (field_width > 0 && next - str > field_width) {
2450 if (base == 0)
2451 _parse_integer_fixup_radix(str, &base);
2452 while (next - str > field_width) {
2453 if (is_sign)
2454 val.s = div_s64(val.s, base);
2455 else
2456 val.u = div_u64(val.u, base);
2457 --next;
2458 }
2459 }
2460
2461 switch (qualifier) {
2462 case 'H': /* that's 'hh' in format */
2463 if (is_sign)
2464 *va_arg(args, signed char *) = val.s;
2465 else
2466 *va_arg(args, unsigned char *) = val.u;
2467 break;
2468 case 'h':
2469 if (is_sign)
2470 *va_arg(args, short *) = val.s;
2471 else
2472 *va_arg(args, unsigned short *) = val.u;
2473 break;
2474 case 'l':
2475 if (is_sign)
2476 *va_arg(args, long *) = val.s;
2477 else
2478 *va_arg(args, unsigned long *) = val.u;
2479 break;
2480 case 'L':
2481 if (is_sign)
2482 *va_arg(args, long long *) = val.s;
2483 else
2484 *va_arg(args, unsigned long long *) = val.u;
2485 break;
2486 case 'Z':
2487 case 'z':
2488 *va_arg(args, size_t *) = val.u;
2489 break;
2490 default:
2491 if (is_sign)
2492 *va_arg(args, int *) = val.s;
2493 else
2494 *va_arg(args, unsigned int *) = val.u;
2495 break;
2496 }
2497 num++;
2498
2499 if (!next)
2500 break;
2501 str = next;
2502 }
2503
2504 return num;
2505 }
2506 EXPORT_SYMBOL(vsscanf);
2507
2508 /**
2509 * sscanf - Unformat a buffer into a list of arguments
2510 * @buf: input buffer
2511 * @fmt: formatting of buffer
2512 * @...: resulting arguments
2513 */
2514 int sscanf(const char *buf, const char *fmt, ...)
2515 {
2516 va_list args;
2517 int i;
2518
2519 va_start(args, fmt);
2520 i = vsscanf(buf, fmt, args);
2521 va_end(args);
2522
2523 return i;
2524 }
2525 EXPORT_SYMBOL(sscanf);
Ubuntu Artful kernel mirror