projects/linux·blob v3.3-rc2 · refs

2040 lines · 47.2 KiB

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 <[email protected]>
14 * - changed to provide snprintf and vsnprintf functions
15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <[email protected]>
16 * - scnprintf and vscnprintf
17 */
18
19#include <stdarg.h>
20#include <linux/module.h>
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/uaccess.h>
27#include <linux/ioport.h>
28#include <net/addrconf.h>
29
30#include <asm/page.h> /* for PAGE_SIZE */
31#include <asm/div64.h>
32#include <asm/sections.h> /* for dereference_function_descriptor() */
33
34#include "kstrtox.h"
35
36/**
37 * simple_strtoull - convert a string to an unsigned long long
38 * @cp: The start of the string
39 * @endp: A pointer to the end of the parsed string will be placed here
40 * @base: The number base to use
41 */
42unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
43{
44 unsigned long long result;
45 unsigned int rv;
46
47 cp = _parse_integer_fixup_radix(cp, &base);
48 rv = _parse_integer(cp, base, &result);
49 /* FIXME */
50 cp += (rv & ~KSTRTOX_OVERFLOW);
51
52 if (endp)
53 *endp = (char *)cp;
54
55 return result;
56}
57EXPORT_SYMBOL(simple_strtoull);
58
59/**
60 * simple_strtoul - convert a string to an unsigned long
61 * @cp: The start of the string
62 * @endp: A pointer to the end of the parsed string will be placed here
63 * @base: The number base to use
64 */
65unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
66{
67 return simple_strtoull(cp, endp, base);
68}
69EXPORT_SYMBOL(simple_strtoul);
70
71/**
72 * simple_strtol - convert a string to a signed long
73 * @cp: The start of the string
74 * @endp: A pointer to the end of the parsed string will be placed here
75 * @base: The number base to use
76 */
77long simple_strtol(const char *cp, char **endp, unsigned int base)
78{
79 if (*cp == '-')
80 return -simple_strtoul(cp + 1, endp, base);
81
82 return simple_strtoul(cp, endp, base);
83}
84EXPORT_SYMBOL(simple_strtol);
85
86/**
87 * simple_strtoll - convert a string to a signed long long
88 * @cp: The start of the string
89 * @endp: A pointer to the end of the parsed string will be placed here
90 * @base: The number base to use
91 */
92long long simple_strtoll(const char *cp, char **endp, unsigned int base)
93{
94 if (*cp == '-')
95 return -simple_strtoull(cp + 1, endp, base);
96
97 return simple_strtoull(cp, endp, base);
98}
99EXPORT_SYMBOL(simple_strtoll);
100
101static noinline_for_stack
102int skip_atoi(const char **s)
103{
104 int i = 0;
105
106 while (isdigit(**s))
107 i = i*10 + *((*s)++) - '0';
108
109 return i;
110}
111
112/* Decimal conversion is by far the most typical, and is used
113 * for /proc and /sys data. This directly impacts e.g. top performance
114 * with many processes running. We optimize it for speed
115 * using code from
116 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
117 * (with permission from the author, Douglas W. Jones). */
118
119/* Formats correctly any integer in [0,99999].
120 * Outputs from one to five digits depending on input.
121 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
122static noinline_for_stack
123char *put_dec_trunc(char *buf, unsigned q)
124{
125 unsigned d3, d2, d1, d0;
126 d1 = (q>>4) & 0xf;
127 d2 = (q>>8) & 0xf;
128 d3 = (q>>12);
129
130 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
131 q = (d0 * 0xcd) >> 11;
132 d0 = d0 - 10*q;
133 *buf++ = d0 + '0'; /* least significant digit */
134 d1 = q + 9*d3 + 5*d2 + d1;
135 if (d1 != 0) {
136 q = (d1 * 0xcd) >> 11;
137 d1 = d1 - 10*q;
138 *buf++ = d1 + '0'; /* next digit */
139
140 d2 = q + 2*d2;
141 if ((d2 != 0) || (d3 != 0)) {
142 q = (d2 * 0xd) >> 7;
143 d2 = d2 - 10*q;
144 *buf++ = d2 + '0'; /* next digit */
145
146 d3 = q + 4*d3;
147 if (d3 != 0) {
148 q = (d3 * 0xcd) >> 11;
149 d3 = d3 - 10*q;
150 *buf++ = d3 + '0'; /* next digit */
151 if (q != 0)
152 *buf++ = q + '0'; /* most sign. digit */
153 }
154 }
155 }
156
157 return buf;
158}
159/* Same with if's removed. Always emits five digits */
160static noinline_for_stack
161char *put_dec_full(char *buf, unsigned q)
162{
163 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
164 /* but anyway, gcc produces better code with full-sized ints */
165 unsigned d3, d2, d1, d0;
166 d1 = (q>>4) & 0xf;
167 d2 = (q>>8) & 0xf;
168 d3 = (q>>12);
169
170 /*
171 * Possible ways to approx. divide by 10
172 * gcc -O2 replaces multiply with shifts and adds
173 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
174 * (x * 0x67) >> 10: 1100111
175 * (x * 0x34) >> 9: 110100 - same
176 * (x * 0x1a) >> 8: 11010 - same
177 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
178 */
179 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
180 q = (d0 * 0xcd) >> 11;
181 d0 = d0 - 10*q;
182 *buf++ = d0 + '0';
183 d1 = q + 9*d3 + 5*d2 + d1;
184 q = (d1 * 0xcd) >> 11;
185 d1 = d1 - 10*q;
186 *buf++ = d1 + '0';
187
188 d2 = q + 2*d2;
189 q = (d2 * 0xd) >> 7;
190 d2 = d2 - 10*q;
191 *buf++ = d2 + '0';
192
193 d3 = q + 4*d3;
194 q = (d3 * 0xcd) >> 11; /* - shorter code */
195 /* q = (d3 * 0x67) >> 10; - would also work */
196 d3 = d3 - 10*q;
197 *buf++ = d3 + '0';
198 *buf++ = q + '0';
199
200 return buf;
201}
202/* No inlining helps gcc to use registers better */
203static noinline_for_stack
204char *put_dec(char *buf, unsigned long long num)
205{
206 while (1) {
207 unsigned rem;
208 if (num < 100000)
209 return put_dec_trunc(buf, num);
210 rem = do_div(num, 100000);
211 buf = put_dec_full(buf, rem);
212 }
213}
214
215#define ZEROPAD 1 /* pad with zero */
216#define SIGN 2 /* unsigned/signed long */
217#define PLUS 4 /* show plus */
218#define SPACE 8 /* space if plus */
219#define LEFT 16 /* left justified */
220#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
221#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
222
223enum format_type {
224 FORMAT_TYPE_NONE, /* Just a string part */
225 FORMAT_TYPE_WIDTH,
226 FORMAT_TYPE_PRECISION,
227 FORMAT_TYPE_CHAR,
228 FORMAT_TYPE_STR,
229 FORMAT_TYPE_PTR,
230 FORMAT_TYPE_PERCENT_CHAR,
231 FORMAT_TYPE_INVALID,
232 FORMAT_TYPE_LONG_LONG,
233 FORMAT_TYPE_ULONG,
234 FORMAT_TYPE_LONG,
235 FORMAT_TYPE_UBYTE,
236 FORMAT_TYPE_BYTE,
237 FORMAT_TYPE_USHORT,
238 FORMAT_TYPE_SHORT,
239 FORMAT_TYPE_UINT,
240 FORMAT_TYPE_INT,
241 FORMAT_TYPE_NRCHARS,
242 FORMAT_TYPE_SIZE_T,
243 FORMAT_TYPE_PTRDIFF
244};
245
246struct printf_spec {
247 u8 type; /* format_type enum */
248 u8 flags; /* flags to number() */
249 u8 base; /* number base, 8, 10 or 16 only */
250 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
251 s16 field_width; /* width of output field */
252 s16 precision; /* # of digits/chars */
253};
254
255static noinline_for_stack
256char *number(char *buf, char *end, unsigned long long num,
257 struct printf_spec spec)
258{
259 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
260 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
261
262 char tmp[66];
263 char sign;
264 char locase;
265 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
266 int i;
267
268 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
269 * produces same digits or (maybe lowercased) letters */
270 locase = (spec.flags & SMALL);
271 if (spec.flags & LEFT)
272 spec.flags &= ~ZEROPAD;
273 sign = 0;
274 if (spec.flags & SIGN) {
275 if ((signed long long)num < 0) {
276 sign = '-';
277 num = -(signed long long)num;
278 spec.field_width--;
279 } else if (spec.flags & PLUS) {
280 sign = '+';
281 spec.field_width--;
282 } else if (spec.flags & SPACE) {
283 sign = ' ';
284 spec.field_width--;
285 }
286 }
287 if (need_pfx) {
288 spec.field_width--;
289 if (spec.base == 16)
290 spec.field_width--;
291 }
292
293 /* generate full string in tmp[], in reverse order */
294 i = 0;
295 if (num == 0)
296 tmp[i++] = '0';
297 /* Generic code, for any base:
298 else do {
299 tmp[i++] = (digits[do_div(num,base)] | locase);
300 } while (num != 0);
301 */
302 else if (spec.base != 10) { /* 8 or 16 */
303 int mask = spec.base - 1;
304 int shift = 3;
305
306 if (spec.base == 16)
307 shift = 4;
308 do {
309 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
310 num >>= shift;
311 } while (num);
312 } else { /* base 10 */
313 i = put_dec(tmp, num) - tmp;
314 }
315
316 /* printing 100 using %2d gives "100", not "00" */
317 if (i > spec.precision)
318 spec.precision = i;
319 /* leading space padding */
320 spec.field_width -= spec.precision;
321 if (!(spec.flags & (ZEROPAD+LEFT))) {
322 while (--spec.field_width >= 0) {
323 if (buf < end)
324 *buf = ' ';
325 ++buf;
326 }
327 }
328 /* sign */
329 if (sign) {
330 if (buf < end)
331 *buf = sign;
332 ++buf;
333 }
334 /* "0x" / "0" prefix */
335 if (need_pfx) {
336 if (buf < end)
337 *buf = '0';
338 ++buf;
339 if (spec.base == 16) {
340 if (buf < end)
341 *buf = ('X' | locase);
342 ++buf;
343 }
344 }
345 /* zero or space padding */
346 if (!(spec.flags & LEFT)) {
347 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
348 while (--spec.field_width >= 0) {
349 if (buf < end)
350 *buf = c;
351 ++buf;
352 }
353 }
354 /* hmm even more zero padding? */
355 while (i <= --spec.precision) {
356 if (buf < end)
357 *buf = '0';
358 ++buf;
359 }
360 /* actual digits of result */
361 while (--i >= 0) {
362 if (buf < end)
363 *buf = tmp[i];
364 ++buf;
365 }
366 /* trailing space padding */
367 while (--spec.field_width >= 0) {
368 if (buf < end)
369 *buf = ' ';
370 ++buf;
371 }
372
373 return buf;
374}
375
376static noinline_for_stack
377char *string(char *buf, char *end, const char *s, struct printf_spec spec)
378{
379 int len, i;
380
381 if ((unsigned long)s < PAGE_SIZE)
382 s = "(null)";
383
384 len = strnlen(s, spec.precision);
385
386 if (!(spec.flags & LEFT)) {
387 while (len < spec.field_width--) {
388 if (buf < end)
389 *buf = ' ';
390 ++buf;
391 }
392 }
393 for (i = 0; i < len; ++i) {
394 if (buf < end)
395 *buf = *s;
396 ++buf; ++s;
397 }
398 while (len < spec.field_width--) {
399 if (buf < end)
400 *buf = ' ';
401 ++buf;
402 }
403
404 return buf;
405}
406
407static noinline_for_stack
408char *symbol_string(char *buf, char *end, void *ptr,
409 struct printf_spec spec, char ext)
410{
411 unsigned long value = (unsigned long) ptr;
412#ifdef CONFIG_KALLSYMS
413 char sym[KSYM_SYMBOL_LEN];
414 if (ext == 'B')
415 sprint_backtrace(sym, value);
416 else if (ext != 'f' && ext != 's')
417 sprint_symbol(sym, value);
418 else
419 kallsyms_lookup(value, NULL, NULL, NULL, sym);
420
421 return string(buf, end, sym, spec);
422#else
423 spec.field_width = 2 * sizeof(void *);
424 spec.flags |= SPECIAL | SMALL | ZEROPAD;
425 spec.base = 16;
426
427 return number(buf, end, value, spec);
428#endif
429}
430
431static noinline_for_stack
432char *resource_string(char *buf, char *end, struct resource *res,
433 struct printf_spec spec, const char *fmt)
434{
435#ifndef IO_RSRC_PRINTK_SIZE
436#define IO_RSRC_PRINTK_SIZE 6
437#endif
438
439#ifndef MEM_RSRC_PRINTK_SIZE
440#define MEM_RSRC_PRINTK_SIZE 10
441#endif
442 static const struct printf_spec io_spec = {
443 .base = 16,
444 .field_width = IO_RSRC_PRINTK_SIZE,
445 .precision = -1,
446 .flags = SPECIAL | SMALL | ZEROPAD,
447 };
448 static const struct printf_spec mem_spec = {
449 .base = 16,
450 .field_width = MEM_RSRC_PRINTK_SIZE,
451 .precision = -1,
452 .flags = SPECIAL | SMALL | ZEROPAD,
453 };
454 static const struct printf_spec bus_spec = {
455 .base = 16,
456 .field_width = 2,
457 .precision = -1,
458 .flags = SMALL | ZEROPAD,
459 };
460 static const struct printf_spec dec_spec = {
461 .base = 10,
462 .precision = -1,
463 .flags = 0,
464 };
465 static const struct printf_spec str_spec = {
466 .field_width = -1,
467 .precision = 10,
468 .flags = LEFT,
469 };
470 static const struct printf_spec flag_spec = {
471 .base = 16,
472 .precision = -1,
473 .flags = SPECIAL | SMALL,
474 };
475
476 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
477 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
478#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
479#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
480#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
481#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
482 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
483 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
484
485 char *p = sym, *pend = sym + sizeof(sym);
486 int decode = (fmt[0] == 'R') ? 1 : 0;
487 const struct printf_spec *specp;
488
489 *p++ = '[';
490 if (res->flags & IORESOURCE_IO) {
491 p = string(p, pend, "io ", str_spec);
492 specp = &io_spec;
493 } else if (res->flags & IORESOURCE_MEM) {
494 p = string(p, pend, "mem ", str_spec);
495 specp = &mem_spec;
496 } else if (res->flags & IORESOURCE_IRQ) {
497 p = string(p, pend, "irq ", str_spec);
498 specp = &dec_spec;
499 } else if (res->flags & IORESOURCE_DMA) {
500 p = string(p, pend, "dma ", str_spec);
501 specp = &dec_spec;
502 } else if (res->flags & IORESOURCE_BUS) {
503 p = string(p, pend, "bus ", str_spec);
504 specp = &bus_spec;
505 } else {
506 p = string(p, pend, "??? ", str_spec);
507 specp = &mem_spec;
508 decode = 0;
509 }
510 p = number(p, pend, res->start, *specp);
511 if (res->start != res->end) {
512 *p++ = '-';
513 p = number(p, pend, res->end, *specp);
514 }
515 if (decode) {
516 if (res->flags & IORESOURCE_MEM_64)
517 p = string(p, pend, " 64bit", str_spec);
518 if (res->flags & IORESOURCE_PREFETCH)
519 p = string(p, pend, " pref", str_spec);
520 if (res->flags & IORESOURCE_WINDOW)
521 p = string(p, pend, " window", str_spec);
522 if (res->flags & IORESOURCE_DISABLED)
523 p = string(p, pend, " disabled", str_spec);
524 } else {
525 p = string(p, pend, " flags ", str_spec);
526 p = number(p, pend, res->flags, flag_spec);
527 }
528 *p++ = ']';
529 *p = '\0';
530
531 return string(buf, end, sym, spec);
532}
533
534static noinline_for_stack
535char *mac_address_string(char *buf, char *end, u8 *addr,
536 struct printf_spec spec, const char *fmt)
537{
538 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
539 char *p = mac_addr;
540 int i;
541 char separator;
542
543 if (fmt[1] == 'F') { /* FDDI canonical format */
544 separator = '-';
545 } else {
546 separator = ':';
547 }
548
549 for (i = 0; i < 6; i++) {
550 p = hex_byte_pack(p, addr[i]);
551 if (fmt[0] == 'M' && i != 5)
552 *p++ = separator;
553 }
554 *p = '\0';
555
556 return string(buf, end, mac_addr, spec);
557}
558
559static noinline_for_stack
560char *ip4_string(char *p, const u8 *addr, const char *fmt)
561{
562 int i;
563 bool leading_zeros = (fmt[0] == 'i');
564 int index;
565 int step;
566
567 switch (fmt[2]) {
568 case 'h':
569#ifdef __BIG_ENDIAN
570 index = 0;
571 step = 1;
572#else
573 index = 3;
574 step = -1;
575#endif
576 break;
577 case 'l':
578 index = 3;
579 step = -1;
580 break;
581 case 'n':
582 case 'b':
583 default:
584 index = 0;
585 step = 1;
586 break;
587 }
588 for (i = 0; i < 4; i++) {
589 char temp[3]; /* hold each IP quad in reverse order */
590 int digits = put_dec_trunc(temp, addr[index]) - temp;
591 if (leading_zeros) {
592 if (digits < 3)
593 *p++ = '0';
594 if (digits < 2)
595 *p++ = '0';
596 }
597 /* reverse the digits in the quad */
598 while (digits--)
599 *p++ = temp[digits];
600 if (i < 3)
601 *p++ = '.';
602 index += step;
603 }
604 *p = '\0';
605
606 return p;
607}
608
609static noinline_for_stack
610char *ip6_compressed_string(char *p, const char *addr)
611{
612 int i, j, range;
613 unsigned char zerolength[8];
614 int longest = 1;
615 int colonpos = -1;
616 u16 word;
617 u8 hi, lo;
618 bool needcolon = false;
619 bool useIPv4;
620 struct in6_addr in6;
621
622 memcpy(&in6, addr, sizeof(struct in6_addr));
623
624 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
625
626 memset(zerolength, 0, sizeof(zerolength));
627
628 if (useIPv4)
629 range = 6;
630 else
631 range = 8;
632
633 /* find position of longest 0 run */
634 for (i = 0; i < range; i++) {
635 for (j = i; j < range; j++) {
636 if (in6.s6_addr16[j] != 0)
637 break;
638 zerolength[i]++;
639 }
640 }
641 for (i = 0; i < range; i++) {
642 if (zerolength[i] > longest) {
643 longest = zerolength[i];
644 colonpos = i;
645 }
646 }
647 if (longest == 1) /* don't compress a single 0 */
648 colonpos = -1;
649
650 /* emit address */
651 for (i = 0; i < range; i++) {
652 if (i == colonpos) {
653 if (needcolon || i == 0)
654 *p++ = ':';
655 *p++ = ':';
656 needcolon = false;
657 i += longest - 1;
658 continue;
659 }
660 if (needcolon) {
661 *p++ = ':';
662 needcolon = false;
663 }
664 /* hex u16 without leading 0s */
665 word = ntohs(in6.s6_addr16[i]);
666 hi = word >> 8;
667 lo = word & 0xff;
668 if (hi) {
669 if (hi > 0x0f)
670 p = hex_byte_pack(p, hi);
671 else
672 *p++ = hex_asc_lo(hi);
673 p = hex_byte_pack(p, lo);
674 }
675 else if (lo > 0x0f)
676 p = hex_byte_pack(p, lo);
677 else
678 *p++ = hex_asc_lo(lo);
679 needcolon = true;
680 }
681
682 if (useIPv4) {
683 if (needcolon)
684 *p++ = ':';
685 p = ip4_string(p, &in6.s6_addr[12], "I4");
686 }
687 *p = '\0';
688
689 return p;
690}
691
692static noinline_for_stack
693char *ip6_string(char *p, const char *addr, const char *fmt)
694{
695 int i;
696
697 for (i = 0; i < 8; i++) {
698 p = hex_byte_pack(p, *addr++);
699 p = hex_byte_pack(p, *addr++);
700 if (fmt[0] == 'I' && i != 7)
701 *p++ = ':';
702 }
703 *p = '\0';
704
705 return p;
706}
707
708static noinline_for_stack
709char *ip6_addr_string(char *buf, char *end, const u8 *addr,
710 struct printf_spec spec, const char *fmt)
711{
712 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
713
714 if (fmt[0] == 'I' && fmt[2] == 'c')
715 ip6_compressed_string(ip6_addr, addr);
716 else
717 ip6_string(ip6_addr, addr, fmt);
718
719 return string(buf, end, ip6_addr, spec);
720}
721
722static noinline_for_stack
723char *ip4_addr_string(char *buf, char *end, const u8 *addr,
724 struct printf_spec spec, const char *fmt)
725{
726 char ip4_addr[sizeof("255.255.255.255")];
727
728 ip4_string(ip4_addr, addr, fmt);
729
730 return string(buf, end, ip4_addr, spec);
731}
732
733static noinline_for_stack
734char *uuid_string(char *buf, char *end, const u8 *addr,
735 struct printf_spec spec, const char *fmt)
736{
737 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
738 char *p = uuid;
739 int i;
740 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
741 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
742 const u8 *index = be;
743 bool uc = false;
744
745 switch (*(++fmt)) {
746 case 'L':
747 uc = true; /* fall-through */
748 case 'l':
749 index = le;
750 break;
751 case 'B':
752 uc = true;
753 break;
754 }
755
756 for (i = 0; i < 16; i++) {
757 p = hex_byte_pack(p, addr[index[i]]);
758 switch (i) {
759 case 3:
760 case 5:
761 case 7:
762 case 9:
763 *p++ = '-';
764 break;
765 }
766 }
767
768 *p = 0;
769
770 if (uc) {
771 p = uuid;
772 do {
773 *p = toupper(*p);
774 } while (*(++p));
775 }
776
777 return string(buf, end, uuid, spec);
778}
779
780static
781char *netdev_feature_string(char *buf, char *end, const u8 *addr,
782 struct printf_spec spec)
783{
784 spec.flags |= SPECIAL | SMALL | ZEROPAD;
785 if (spec.field_width == -1)
786 spec.field_width = 2 + 2 * sizeof(netdev_features_t);
787 spec.base = 16;
788
789 return number(buf, end, *(const netdev_features_t *)addr, spec);
790}
791
792int kptr_restrict __read_mostly;
793
794/*
795 * Show a '%p' thing. A kernel extension is that the '%p' is followed
796 * by an extra set of alphanumeric characters that are extended format
797 * specifiers.
798 *
799 * Right now we handle:
800 *
801 * - 'F' For symbolic function descriptor pointers with offset
802 * - 'f' For simple symbolic function names without offset
803 * - 'S' For symbolic direct pointers with offset
804 * - 's' For symbolic direct pointers without offset
805 * - 'B' For backtraced symbolic direct pointers with offset
806 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
807 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
808 * - 'M' For a 6-byte MAC address, it prints the address in the
809 * usual colon-separated hex notation
810 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
811 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
812 * with a dash-separated hex notation
813 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
814 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
815 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
816 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
817 * IPv6 omits the colons (01020304...0f)
818 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
819 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
820 * - 'I6c' for IPv6 addresses printed as specified by
821 * http://tools.ietf.org/html/rfc5952
822 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
823 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
824 * Options for %pU are:
825 * b big endian lower case hex (default)
826 * B big endian UPPER case hex
827 * l little endian lower case hex
828 * L little endian UPPER case hex
829 * big endian output byte order is:
830 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
831 * little endian output byte order is:
832 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
833 * - 'V' For a struct va_format which contains a format string * and va_list *,
834 * call vsnprintf(->format, *->va_list).
835 * Implements a "recursive vsnprintf".
836 * Do not use this feature without some mechanism to verify the
837 * correctness of the format string and va_list arguments.
838 * - 'K' For a kernel pointer that should be hidden from unprivileged users
839 * - 'NF' For a netdev_features_t
840 *
841 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
842 * function pointers are really function descriptors, which contain a
843 * pointer to the real address.
844 */
845static noinline_for_stack
846char *pointer(const char *fmt, char *buf, char *end, void *ptr,
847 struct printf_spec spec)
848{
849 if (!ptr && *fmt != 'K') {
850 /*
851 * Print (null) with the same width as a pointer so it makes
852 * tabular output look nice.
853 */
854 if (spec.field_width == -1)
855 spec.field_width = 2 * sizeof(void *);
856 return string(buf, end, "(null)", spec);
857 }
858
859 switch (*fmt) {
860 case 'F':
861 case 'f':
862 ptr = dereference_function_descriptor(ptr);
863 /* Fallthrough */
864 case 'S':
865 case 's':
866 case 'B':
867 return symbol_string(buf, end, ptr, spec, *fmt);
868 case 'R':
869 case 'r':
870 return resource_string(buf, end, ptr, spec, fmt);
871 case 'M': /* Colon separated: 00:01:02:03:04:05 */
872 case 'm': /* Contiguous: 000102030405 */
873 /* [mM]F (FDDI, bit reversed) */
874 return mac_address_string(buf, end, ptr, spec, fmt);
875 case 'I': /* Formatted IP supported
876 * 4: 1.2.3.4
877 * 6: 0001:0203:...:0708
878 * 6c: 1::708 or 1::1.2.3.4
879 */
880 case 'i': /* Contiguous:
881 * 4: 001.002.003.004
882 * 6: 000102...0f
883 */
884 switch (fmt[1]) {
885 case '6':
886 return ip6_addr_string(buf, end, ptr, spec, fmt);
887 case '4':
888 return ip4_addr_string(buf, end, ptr, spec, fmt);
889 }
890 break;
891 case 'U':
892 return uuid_string(buf, end, ptr, spec, fmt);
893 case 'V':
894 return buf + vsnprintf(buf, end > buf ? end - buf : 0,
895 ((struct va_format *)ptr)->fmt,
896 *(((struct va_format *)ptr)->va));
897 case 'K':
898 /*
899 * %pK cannot be used in IRQ context because its test
900 * for CAP_SYSLOG would be meaningless.
901 */
902 if (in_irq() || in_serving_softirq() || in_nmi()) {
903 if (spec.field_width == -1)
904 spec.field_width = 2 * sizeof(void *);
905 return string(buf, end, "pK-error", spec);
906 }
907 if (!((kptr_restrict == 0) ||
908 (kptr_restrict == 1 &&
909 has_capability_noaudit(current, CAP_SYSLOG))))
910 ptr = NULL;
911 break;
912 case 'N':
913 switch (fmt[1]) {
914 case 'F':
915 return netdev_feature_string(buf, end, ptr, spec);
916 }
917 break;
918 }
919 spec.flags |= SMALL;
920 if (spec.field_width == -1) {
921 spec.field_width = 2 * sizeof(void *);
922 spec.flags |= ZEROPAD;
923 }
924 spec.base = 16;
925
926 return number(buf, end, (unsigned long) ptr, spec);
927}
928
929/*
930 * Helper function to decode printf style format.
931 * Each call decode a token from the format and return the
932 * number of characters read (or likely the delta where it wants
933 * to go on the next call).
934 * The decoded token is returned through the parameters
935 *
936 * 'h', 'l', or 'L' for integer fields
937 * 'z' support added 23/7/1999 S.H.
938 * 'z' changed to 'Z' --davidm 1/25/99
939 * 't' added for ptrdiff_t
940 *
941 * @fmt: the format string
942 * @type of the token returned
943 * @flags: various flags such as +, -, # tokens..
944 * @field_width: overwritten width
945 * @base: base of the number (octal, hex, ...)
946 * @precision: precision of a number
947 * @qualifier: qualifier of a number (long, size_t, ...)
948 */
949static noinline_for_stack
950int format_decode(const char *fmt, struct printf_spec *spec)
951{
952 const char *start = fmt;
953
954 /* we finished early by reading the field width */
955 if (spec->type == FORMAT_TYPE_WIDTH) {
956 if (spec->field_width < 0) {
957 spec->field_width = -spec->field_width;
958 spec->flags |= LEFT;
959 }
960 spec->type = FORMAT_TYPE_NONE;
961 goto precision;
962 }
963
964 /* we finished early by reading the precision */
965 if (spec->type == FORMAT_TYPE_PRECISION) {
966 if (spec->precision < 0)
967 spec->precision = 0;
968
969 spec->type = FORMAT_TYPE_NONE;
970 goto qualifier;
971 }
972
973 /* By default */
974 spec->type = FORMAT_TYPE_NONE;
975
976 for (; *fmt ; ++fmt) {
977 if (*fmt == '%')
978 break;
979 }
980
981 /* Return the current non-format string */
982 if (fmt != start || !*fmt)
983 return fmt - start;
984
985 /* Process flags */
986 spec->flags = 0;
987
988 while (1) { /* this also skips first '%' */
989 bool found = true;
990
991 ++fmt;
992
993 switch (*fmt) {
994 case '-': spec->flags |= LEFT; break;
995 case '+': spec->flags |= PLUS; break;
996 case ' ': spec->flags |= SPACE; break;
997 case '#': spec->flags |= SPECIAL; break;
998 case '0': spec->flags |= ZEROPAD; break;
999 default: found = false;
1000 }
1001
1002 if (!found)
1003 break;
1004 }
1005
1006 /* get field width */
1007 spec->field_width = -1;
1008
1009 if (isdigit(*fmt))
1010 spec->field_width = skip_atoi(&fmt);
1011 else if (*fmt == '*') {
1012 /* it's the next argument */
1013 spec->type = FORMAT_TYPE_WIDTH;
1014 return ++fmt - start;
1015 }
1016
1017precision:
1018 /* get the precision */
1019 spec->precision = -1;
1020 if (*fmt == '.') {
1021 ++fmt;
1022 if (isdigit(*fmt)) {
1023 spec->precision = skip_atoi(&fmt);
1024 if (spec->precision < 0)
1025 spec->precision = 0;
1026 } else if (*fmt == '*') {
1027 /* it's the next argument */
1028 spec->type = FORMAT_TYPE_PRECISION;
1029 return ++fmt - start;
1030 }
1031 }
1032
1033qualifier:
1034 /* get the conversion qualifier */
1035 spec->qualifier = -1;
1036 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1037 _tolower(*fmt) == 'z' || *fmt == 't') {
1038 spec->qualifier = *fmt++;
1039 if (unlikely(spec->qualifier == *fmt)) {
1040 if (spec->qualifier == 'l') {
1041 spec->qualifier = 'L';
1042 ++fmt;
1043 } else if (spec->qualifier == 'h') {
1044 spec->qualifier = 'H';
1045 ++fmt;
1046 }
1047 }
1048 }
1049
1050 /* default base */
1051 spec->base = 10;
1052 switch (*fmt) {
1053 case 'c':
1054 spec->type = FORMAT_TYPE_CHAR;
1055 return ++fmt - start;
1056
1057 case 's':
1058 spec->type = FORMAT_TYPE_STR;
1059 return ++fmt - start;
1060
1061 case 'p':
1062 spec->type = FORMAT_TYPE_PTR;
1063 return fmt - start;
1064 /* skip alnum */
1065
1066 case 'n':
1067 spec->type = FORMAT_TYPE_NRCHARS;
1068 return ++fmt - start;
1069
1070 case '%':
1071 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1072 return ++fmt - start;
1073
1074 /* integer number formats - set up the flags and "break" */
1075 case 'o':
1076 spec->base = 8;
1077 break;
1078
1079 case 'x':
1080 spec->flags |= SMALL;
1081
1082 case 'X':
1083 spec->base = 16;
1084 break;
1085
1086 case 'd':
1087 case 'i':
1088 spec->flags |= SIGN;
1089 case 'u':
1090 break;
1091
1092 default:
1093 spec->type = FORMAT_TYPE_INVALID;
1094 return fmt - start;
1095 }
1096
1097 if (spec->qualifier == 'L')
1098 spec->type = FORMAT_TYPE_LONG_LONG;
1099 else if (spec->qualifier == 'l') {
1100 if (spec->flags & SIGN)
1101 spec->type = FORMAT_TYPE_LONG;
1102 else
1103 spec->type = FORMAT_TYPE_ULONG;
1104 } else if (_tolower(spec->qualifier) == 'z') {
1105 spec->type = FORMAT_TYPE_SIZE_T;
1106 } else if (spec->qualifier == 't') {
1107 spec->type = FORMAT_TYPE_PTRDIFF;
1108 } else if (spec->qualifier == 'H') {
1109 if (spec->flags & SIGN)
1110 spec->type = FORMAT_TYPE_BYTE;
1111 else
1112 spec->type = FORMAT_TYPE_UBYTE;
1113 } else if (spec->qualifier == 'h') {
1114 if (spec->flags & SIGN)
1115 spec->type = FORMAT_TYPE_SHORT;
1116 else
1117 spec->type = FORMAT_TYPE_USHORT;
1118 } else {
1119 if (spec->flags & SIGN)
1120 spec->type = FORMAT_TYPE_INT;
1121 else
1122 spec->type = FORMAT_TYPE_UINT;
1123 }
1124
1125 return ++fmt - start;
1126}
1127
1128/**
1129 * vsnprintf - Format a string and place it in a buffer
1130 * @buf: The buffer to place the result into
1131 * @size: The size of the buffer, including the trailing null space
1132 * @fmt: The format string to use
1133 * @args: Arguments for the format string
1134 *
1135 * This function follows C99 vsnprintf, but has some extensions:
1136 * %pS output the name of a text symbol with offset
1137 * %ps output the name of a text symbol without offset
1138 * %pF output the name of a function pointer with its offset
1139 * %pf output the name of a function pointer without its offset
1140 * %pB output the name of a backtrace symbol with its offset
1141 * %pR output the address range in a struct resource with decoded flags
1142 * %pr output the address range in a struct resource with raw flags
1143 * %pM output a 6-byte MAC address with colons
1144 * %pm output a 6-byte MAC address without colons
1145 * %pI4 print an IPv4 address without leading zeros
1146 * %pi4 print an IPv4 address with leading zeros
1147 * %pI6 print an IPv6 address with colons
1148 * %pi6 print an IPv6 address without colons
1149 * %pI6c print an IPv6 address as specified by RFC 5952
1150 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1151 * case.
1152 * %n is ignored
1153 *
1154 * The return value is the number of characters which would
1155 * be generated for the given input, excluding the trailing
1156 * '\0', as per ISO C99. If you want to have the exact
1157 * number of characters written into @buf as return value
1158 * (not including the trailing '\0'), use vscnprintf(). If the
1159 * return is greater than or equal to @size, the resulting
1160 * string is truncated.
1161 *
1162 * If you're not already dealing with a va_list consider using snprintf().
1163 */
1164int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1165{
1166 unsigned long long num;
1167 char *str, *end;
1168 struct printf_spec spec = {0};
1169
1170 /* Reject out-of-range values early. Large positive sizes are
1171 used for unknown buffer sizes. */
1172 if (WARN_ON_ONCE((int) size < 0))
1173 return 0;
1174
1175 str = buf;
1176 end = buf + size;
1177
1178 /* Make sure end is always >= buf */
1179 if (end < buf) {
1180 end = ((void *)-1);
1181 size = end - buf;
1182 }
1183
1184 while (*fmt) {
1185 const char *old_fmt = fmt;
1186 int read = format_decode(fmt, &spec);
1187
1188 fmt += read;
1189
1190 switch (spec.type) {
1191 case FORMAT_TYPE_NONE: {
1192 int copy = read;
1193 if (str < end) {
1194 if (copy > end - str)
1195 copy = end - str;
1196 memcpy(str, old_fmt, copy);
1197 }
1198 str += read;
1199 break;
1200 }
1201
1202 case FORMAT_TYPE_WIDTH:
1203 spec.field_width = va_arg(args, int);
1204 break;
1205
1206 case FORMAT_TYPE_PRECISION:
1207 spec.precision = va_arg(args, int);
1208 break;
1209
1210 case FORMAT_TYPE_CHAR: {
1211 char c;
1212
1213 if (!(spec.flags & LEFT)) {
1214 while (--spec.field_width > 0) {
1215 if (str < end)
1216 *str = ' ';
1217 ++str;
1218
1219 }
1220 }
1221 c = (unsigned char) va_arg(args, int);
1222 if (str < end)
1223 *str = c;
1224 ++str;
1225 while (--spec.field_width > 0) {
1226 if (str < end)
1227 *str = ' ';
1228 ++str;
1229 }
1230 break;
1231 }
1232
1233 case FORMAT_TYPE_STR:
1234 str = string(str, end, va_arg(args, char *), spec);
1235 break;
1236
1237 case FORMAT_TYPE_PTR:
1238 str = pointer(fmt+1, str, end, va_arg(args, void *),
1239 spec);
1240 while (isalnum(*fmt))
1241 fmt++;
1242 break;
1243
1244 case FORMAT_TYPE_PERCENT_CHAR:
1245 if (str < end)
1246 *str = '%';
1247 ++str;
1248 break;
1249
1250 case FORMAT_TYPE_INVALID:
1251 if (str < end)
1252 *str = '%';
1253 ++str;
1254 break;
1255
1256 case FORMAT_TYPE_NRCHARS: {
1257 u8 qualifier = spec.qualifier;
1258
1259 if (qualifier == 'l') {
1260 long *ip = va_arg(args, long *);
1261 *ip = (str - buf);
1262 } else if (_tolower(qualifier) == 'z') {
1263 size_t *ip = va_arg(args, size_t *);
1264 *ip = (str - buf);
1265 } else {
1266 int *ip = va_arg(args, int *);
1267 *ip = (str - buf);
1268 }
1269 break;
1270 }
1271
1272 default:
1273 switch (spec.type) {
1274 case FORMAT_TYPE_LONG_LONG:
1275 num = va_arg(args, long long);
1276 break;
1277 case FORMAT_TYPE_ULONG:
1278 num = va_arg(args, unsigned long);
1279 break;
1280 case FORMAT_TYPE_LONG:
1281 num = va_arg(args, long);
1282 break;
1283 case FORMAT_TYPE_SIZE_T:
1284 num = va_arg(args, size_t);
1285 break;
1286 case FORMAT_TYPE_PTRDIFF:
1287 num = va_arg(args, ptrdiff_t);
1288 break;
1289 case FORMAT_TYPE_UBYTE:
1290 num = (unsigned char) va_arg(args, int);
1291 break;
1292 case FORMAT_TYPE_BYTE:
1293 num = (signed char) va_arg(args, int);
1294 break;
1295 case FORMAT_TYPE_USHORT:
1296 num = (unsigned short) va_arg(args, int);
1297 break;
1298 case FORMAT_TYPE_SHORT:
1299 num = (short) va_arg(args, int);
1300 break;
1301 case FORMAT_TYPE_INT:
1302 num = (int) va_arg(args, int);
1303 break;
1304 default:
1305 num = va_arg(args, unsigned int);
1306 }
1307
1308 str = number(str, end, num, spec);
1309 }
1310 }
1311
1312 if (size > 0) {
1313 if (str < end)
1314 *str = '\0';
1315 else
1316 end[-1] = '\0';
1317 }
1318
1319 /* the trailing null byte doesn't count towards the total */
1320 return str-buf;
1321
1322}
1323EXPORT_SYMBOL(vsnprintf);
1324
1325/**
1326 * vscnprintf - Format a string and place it in a buffer
1327 * @buf: The buffer to place the result into
1328 * @size: The size of the buffer, including the trailing null space
1329 * @fmt: The format string to use
1330 * @args: Arguments for the format string
1331 *
1332 * The return value is the number of characters which have been written into
1333 * the @buf not including the trailing '\0'. If @size is == 0 the function
1334 * returns 0.
1335 *
1336 * If you're not already dealing with a va_list consider using scnprintf().
1337 *
1338 * See the vsnprintf() documentation for format string extensions over C99.
1339 */
1340int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1341{
1342 int i;
1343
1344 i = vsnprintf(buf, size, fmt, args);
1345
1346 if (likely(i < size))
1347 return i;
1348 if (size != 0)
1349 return size - 1;
1350 return 0;
1351}
1352EXPORT_SYMBOL(vscnprintf);
1353
1354/**
1355 * snprintf - Format a string and place it in a buffer
1356 * @buf: The buffer to place the result into
1357 * @size: The size of the buffer, including the trailing null space
1358 * @fmt: The format string to use
1359 * @...: Arguments for the format string
1360 *
1361 * The return value is the number of characters which would be
1362 * generated for the given input, excluding the trailing null,
1363 * as per ISO C99. If the return is greater than or equal to
1364 * @size, the resulting string is truncated.
1365 *
1366 * See the vsnprintf() documentation for format string extensions over C99.
1367 */
1368int snprintf(char *buf, size_t size, const char *fmt, ...)
1369{
1370 va_list args;
1371 int i;
1372
1373 va_start(args, fmt);
1374 i = vsnprintf(buf, size, fmt, args);
1375 va_end(args);
1376
1377 return i;
1378}
1379EXPORT_SYMBOL(snprintf);
1380
1381/**
1382 * scnprintf - Format a string and place it in a buffer
1383 * @buf: The buffer to place the result into
1384 * @size: The size of the buffer, including the trailing null space
1385 * @fmt: The format string to use
1386 * @...: Arguments for the format string
1387 *
1388 * The return value is the number of characters written into @buf not including
1389 * the trailing '\0'. If @size is == 0 the function returns 0.
1390 */
1391
1392int scnprintf(char *buf, size_t size, const char *fmt, ...)
1393{
1394 va_list args;
1395 int i;
1396
1397 va_start(args, fmt);
1398 i = vscnprintf(buf, size, fmt, args);
1399 va_end(args);
1400
1401 return i;
1402}
1403EXPORT_SYMBOL(scnprintf);
1404
1405/**
1406 * vsprintf - Format a string and place it in a buffer
1407 * @buf: The buffer to place the result into
1408 * @fmt: The format string to use
1409 * @args: Arguments for the format string
1410 *
1411 * The function returns the number of characters written
1412 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1413 * buffer overflows.
1414 *
1415 * If you're not already dealing with a va_list consider using sprintf().
1416 *
1417 * See the vsnprintf() documentation for format string extensions over C99.
1418 */
1419int vsprintf(char *buf, const char *fmt, va_list args)
1420{
1421 return vsnprintf(buf, INT_MAX, fmt, args);
1422}
1423EXPORT_SYMBOL(vsprintf);
1424
1425/**
1426 * sprintf - Format a string and place it in a buffer
1427 * @buf: The buffer to place the result into
1428 * @fmt: The format string to use
1429 * @...: Arguments for the format string
1430 *
1431 * The function returns the number of characters written
1432 * into @buf. Use snprintf() or scnprintf() in order to avoid
1433 * buffer overflows.
1434 *
1435 * See the vsnprintf() documentation for format string extensions over C99.
1436 */
1437int sprintf(char *buf, const char *fmt, ...)
1438{
1439 va_list args;
1440 int i;
1441
1442 va_start(args, fmt);
1443 i = vsnprintf(buf, INT_MAX, fmt, args);
1444 va_end(args);
1445
1446 return i;
1447}
1448EXPORT_SYMBOL(sprintf);
1449
1450#ifdef CONFIG_BINARY_PRINTF
1451/*
1452 * bprintf service:
1453 * vbin_printf() - VA arguments to binary data
1454 * bstr_printf() - Binary data to text string
1455 */
1456
1457/**
1458 * vbin_printf - Parse a format string and place args' binary value in a buffer
1459 * @bin_buf: The buffer to place args' binary value
1460 * @size: The size of the buffer(by words(32bits), not characters)
1461 * @fmt: The format string to use
1462 * @args: Arguments for the format string
1463 *
1464 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1465 * is skiped.
1466 *
1467 * The return value is the number of words(32bits) which would be generated for
1468 * the given input.
1469 *
1470 * NOTE:
1471 * If the return value is greater than @size, the resulting bin_buf is NOT
1472 * valid for bstr_printf().
1473 */
1474int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1475{
1476 struct printf_spec spec = {0};
1477 char *str, *end;
1478
1479 str = (char *)bin_buf;
1480 end = (char *)(bin_buf + size);
1481
1482#define save_arg(type) \
1483do { \
1484 if (sizeof(type) == 8) { \
1485 unsigned long long value; \
1486 str = PTR_ALIGN(str, sizeof(u32)); \
1487 value = va_arg(args, unsigned long long); \
1488 if (str + sizeof(type) <= end) { \
1489 *(u32 *)str = *(u32 *)&value; \
1490 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1491 } \
1492 } else { \
1493 unsigned long value; \
1494 str = PTR_ALIGN(str, sizeof(type)); \
1495 value = va_arg(args, int); \
1496 if (str + sizeof(type) <= end) \
1497 *(typeof(type) *)str = (type)value; \
1498 } \
1499 str += sizeof(type); \
1500} while (0)
1501
1502 while (*fmt) {
1503 int read = format_decode(fmt, &spec);
1504
1505 fmt += read;
1506
1507 switch (spec.type) {
1508 case FORMAT_TYPE_NONE:
1509 case FORMAT_TYPE_INVALID:
1510 case FORMAT_TYPE_PERCENT_CHAR:
1511 break;
1512
1513 case FORMAT_TYPE_WIDTH:
1514 case FORMAT_TYPE_PRECISION:
1515 save_arg(int);
1516 break;
1517
1518 case FORMAT_TYPE_CHAR:
1519 save_arg(char);
1520 break;
1521
1522 case FORMAT_TYPE_STR: {
1523 const char *save_str = va_arg(args, char *);
1524 size_t len;
1525
1526 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1527 || (unsigned long)save_str < PAGE_SIZE)
1528 save_str = "(null)";
1529 len = strlen(save_str) + 1;
1530 if (str + len < end)
1531 memcpy(str, save_str, len);
1532 str += len;
1533 break;
1534 }
1535
1536 case FORMAT_TYPE_PTR:
1537 save_arg(void *);
1538 /* skip all alphanumeric pointer suffixes */
1539 while (isalnum(*fmt))
1540 fmt++;
1541 break;
1542
1543 case FORMAT_TYPE_NRCHARS: {
1544 /* skip %n 's argument */
1545 u8 qualifier = spec.qualifier;
1546 void *skip_arg;
1547 if (qualifier == 'l')
1548 skip_arg = va_arg(args, long *);
1549 else if (_tolower(qualifier) == 'z')
1550 skip_arg = va_arg(args, size_t *);
1551 else
1552 skip_arg = va_arg(args, int *);
1553 break;
1554 }
1555
1556 default:
1557 switch (spec.type) {
1558
1559 case FORMAT_TYPE_LONG_LONG:
1560 save_arg(long long);
1561 break;
1562 case FORMAT_TYPE_ULONG:
1563 case FORMAT_TYPE_LONG:
1564 save_arg(unsigned long);
1565 break;
1566 case FORMAT_TYPE_SIZE_T:
1567 save_arg(size_t);
1568 break;
1569 case FORMAT_TYPE_PTRDIFF:
1570 save_arg(ptrdiff_t);
1571 break;
1572 case FORMAT_TYPE_UBYTE:
1573 case FORMAT_TYPE_BYTE:
1574 save_arg(char);
1575 break;
1576 case FORMAT_TYPE_USHORT:
1577 case FORMAT_TYPE_SHORT:
1578 save_arg(short);
1579 break;
1580 default:
1581 save_arg(int);
1582 }
1583 }
1584 }
1585
1586 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1587#undef save_arg
1588}
1589EXPORT_SYMBOL_GPL(vbin_printf);
1590
1591/**
1592 * bstr_printf - Format a string from binary arguments and place it in a buffer
1593 * @buf: The buffer to place the result into
1594 * @size: The size of the buffer, including the trailing null space
1595 * @fmt: The format string to use
1596 * @bin_buf: Binary arguments for the format string
1597 *
1598 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1599 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1600 * a binary buffer that generated by vbin_printf.
1601 *
1602 * The format follows C99 vsnprintf, but has some extensions:
1603 * see vsnprintf comment for details.
1604 *
1605 * The return value is the number of characters which would
1606 * be generated for the given input, excluding the trailing
1607 * '\0', as per ISO C99. If you want to have the exact
1608 * number of characters written into @buf as return value
1609 * (not including the trailing '\0'), use vscnprintf(). If the
1610 * return is greater than or equal to @size, the resulting
1611 * string is truncated.
1612 */
1613int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1614{
1615 struct printf_spec spec = {0};
1616 char *str, *end;
1617 const char *args = (const char *)bin_buf;
1618
1619 if (WARN_ON_ONCE((int) size < 0))
1620 return 0;
1621
1622 str = buf;
1623 end = buf + size;
1624
1625#define get_arg(type) \
1626({ \
1627 typeof(type) value; \
1628 if (sizeof(type) == 8) { \
1629 args = PTR_ALIGN(args, sizeof(u32)); \
1630 *(u32 *)&value = *(u32 *)args; \
1631 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1632 } else { \
1633 args = PTR_ALIGN(args, sizeof(type)); \
1634 value = *(typeof(type) *)args; \
1635 } \
1636 args += sizeof(type); \
1637 value; \
1638})
1639
1640 /* Make sure end is always >= buf */
1641 if (end < buf) {
1642 end = ((void *)-1);
1643 size = end - buf;
1644 }
1645
1646 while (*fmt) {
1647 const char *old_fmt = fmt;
1648 int read = format_decode(fmt, &spec);
1649
1650 fmt += read;
1651
1652 switch (spec.type) {
1653 case FORMAT_TYPE_NONE: {
1654 int copy = read;
1655 if (str < end) {
1656 if (copy > end - str)
1657 copy = end - str;
1658 memcpy(str, old_fmt, copy);
1659 }
1660 str += read;
1661 break;
1662 }
1663
1664 case FORMAT_TYPE_WIDTH:
1665 spec.field_width = get_arg(int);
1666 break;
1667
1668 case FORMAT_TYPE_PRECISION:
1669 spec.precision = get_arg(int);
1670 break;
1671
1672 case FORMAT_TYPE_CHAR: {
1673 char c;
1674
1675 if (!(spec.flags & LEFT)) {
1676 while (--spec.field_width > 0) {
1677 if (str < end)
1678 *str = ' ';
1679 ++str;
1680 }
1681 }
1682 c = (unsigned char) get_arg(char);
1683 if (str < end)
1684 *str = c;
1685 ++str;
1686 while (--spec.field_width > 0) {
1687 if (str < end)
1688 *str = ' ';
1689 ++str;
1690 }
1691 break;
1692 }
1693
1694 case FORMAT_TYPE_STR: {
1695 const char *str_arg = args;
1696 args += strlen(str_arg) + 1;
1697 str = string(str, end, (char *)str_arg, spec);
1698 break;
1699 }
1700
1701 case FORMAT_TYPE_PTR:
1702 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1703 while (isalnum(*fmt))
1704 fmt++;
1705 break;
1706
1707 case FORMAT_TYPE_PERCENT_CHAR:
1708 case FORMAT_TYPE_INVALID:
1709 if (str < end)
1710 *str = '%';
1711 ++str;
1712 break;
1713
1714 case FORMAT_TYPE_NRCHARS:
1715 /* skip */
1716 break;
1717
1718 default: {
1719 unsigned long long num;
1720
1721 switch (spec.type) {
1722
1723 case FORMAT_TYPE_LONG_LONG:
1724 num = get_arg(long long);
1725 break;
1726 case FORMAT_TYPE_ULONG:
1727 case FORMAT_TYPE_LONG:
1728 num = get_arg(unsigned long);
1729 break;
1730 case FORMAT_TYPE_SIZE_T:
1731 num = get_arg(size_t);
1732 break;
1733 case FORMAT_TYPE_PTRDIFF:
1734 num = get_arg(ptrdiff_t);
1735 break;
1736 case FORMAT_TYPE_UBYTE:
1737 num = get_arg(unsigned char);
1738 break;
1739 case FORMAT_TYPE_BYTE:
1740 num = get_arg(signed char);
1741 break;
1742 case FORMAT_TYPE_USHORT:
1743 num = get_arg(unsigned short);
1744 break;
1745 case FORMAT_TYPE_SHORT:
1746 num = get_arg(short);
1747 break;
1748 case FORMAT_TYPE_UINT:
1749 num = get_arg(unsigned int);
1750 break;
1751 default:
1752 num = get_arg(int);
1753 }
1754
1755 str = number(str, end, num, spec);
1756 } /* default: */
1757 } /* switch(spec.type) */
1758 } /* while(*fmt) */
1759
1760 if (size > 0) {
1761 if (str < end)
1762 *str = '\0';
1763 else
1764 end[-1] = '\0';
1765 }
1766
1767#undef get_arg
1768
1769 /* the trailing null byte doesn't count towards the total */
1770 return str - buf;
1771}
1772EXPORT_SYMBOL_GPL(bstr_printf);
1773
1774/**
1775 * bprintf - Parse a format string and place args' binary value in a buffer
1776 * @bin_buf: The buffer to place args' binary value
1777 * @size: The size of the buffer(by words(32bits), not characters)
1778 * @fmt: The format string to use
1779 * @...: Arguments for the format string
1780 *
1781 * The function returns the number of words(u32) written
1782 * into @bin_buf.
1783 */
1784int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1785{
1786 va_list args;
1787 int ret;
1788
1789 va_start(args, fmt);
1790 ret = vbin_printf(bin_buf, size, fmt, args);
1791 va_end(args);
1792
1793 return ret;
1794}
1795EXPORT_SYMBOL_GPL(bprintf);
1796
1797#endif /* CONFIG_BINARY_PRINTF */
1798
1799/**
1800 * vsscanf - Unformat a buffer into a list of arguments
1801 * @buf: input buffer
1802 * @fmt: format of buffer
1803 * @args: arguments
1804 */
1805int vsscanf(const char *buf, const char *fmt, va_list args)
1806{
1807 const char *str = buf;
1808 char *next;
1809 char digit;
1810 int num = 0;
1811 u8 qualifier;
1812 u8 base;
1813 s16 field_width;
1814 bool is_sign;
1815
1816 while (*fmt && *str) {
1817 /* skip any white space in format */
1818 /* white space in format matchs any amount of
1819 * white space, including none, in the input.
1820 */
1821 if (isspace(*fmt)) {
1822 fmt = skip_spaces(++fmt);
1823 str = skip_spaces(str);
1824 }
1825
1826 /* anything that is not a conversion must match exactly */
1827 if (*fmt != '%' && *fmt) {
1828 if (*fmt++ != *str++)
1829 break;
1830 continue;
1831 }
1832
1833 if (!*fmt)
1834 break;
1835 ++fmt;
1836
1837 /* skip this conversion.
1838 * advance both strings to next white space
1839 */
1840 if (*fmt == '*') {
1841 while (!isspace(*fmt) && *fmt != '%' && *fmt)
1842 fmt++;
1843 while (!isspace(*str) && *str)
1844 str++;
1845 continue;
1846 }
1847
1848 /* get field width */
1849 field_width = -1;
1850 if (isdigit(*fmt))
1851 field_width = skip_atoi(&fmt);
1852
1853 /* get conversion qualifier */
1854 qualifier = -1;
1855 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1856 _tolower(*fmt) == 'z') {
1857 qualifier = *fmt++;
1858 if (unlikely(qualifier == *fmt)) {
1859 if (qualifier == 'h') {
1860 qualifier = 'H';
1861 fmt++;
1862 } else if (qualifier == 'l') {
1863 qualifier = 'L';
1864 fmt++;
1865 }
1866 }
1867 }
1868
1869 if (!*fmt || !*str)
1870 break;
1871
1872 base = 10;
1873 is_sign = 0;
1874
1875 switch (*fmt++) {
1876 case 'c':
1877 {
1878 char *s = (char *)va_arg(args, char*);
1879 if (field_width == -1)
1880 field_width = 1;
1881 do {
1882 *s++ = *str++;
1883 } while (--field_width > 0 && *str);
1884 num++;
1885 }
1886 continue;
1887 case 's':
1888 {
1889 char *s = (char *)va_arg(args, char *);
1890 if (field_width == -1)
1891 field_width = SHRT_MAX;
1892 /* first, skip leading white space in buffer */
1893 str = skip_spaces(str);
1894
1895 /* now copy until next white space */
1896 while (*str && !isspace(*str) && field_width--)
1897 *s++ = *str++;
1898 *s = '\0';
1899 num++;
1900 }
1901 continue;
1902 case 'n':
1903 /* return number of characters read so far */
1904 {
1905 int *i = (int *)va_arg(args, int*);
1906 *i = str - buf;
1907 }
1908 continue;
1909 case 'o':
1910 base = 8;
1911 break;
1912 case 'x':
1913 case 'X':
1914 base = 16;
1915 break;
1916 case 'i':
1917 base = 0;
1918 case 'd':
1919 is_sign = 1;
1920 case 'u':
1921 break;
1922 case '%':
1923 /* looking for '%' in str */
1924 if (*str++ != '%')
1925 return num;
1926 continue;
1927 default:
1928 /* invalid format; stop here */
1929 return num;
1930 }
1931
1932 /* have some sort of integer conversion.
1933 * first, skip white space in buffer.
1934 */
1935 str = skip_spaces(str);
1936
1937 digit = *str;
1938 if (is_sign && digit == '-')
1939 digit = *(str + 1);
1940
1941 if (!digit
1942 || (base == 16 && !isxdigit(digit))
1943 || (base == 10 && !isdigit(digit))
1944 || (base == 8 && (!isdigit(digit) || digit > '7'))
1945 || (base == 0 && !isdigit(digit)))
1946 break;
1947
1948 switch (qualifier) {
1949 case 'H': /* that's 'hh' in format */
1950 if (is_sign) {
1951 signed char *s = (signed char *)va_arg(args, signed char *);
1952 *s = (signed char)simple_strtol(str, &next, base);
1953 } else {
1954 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
1955 *s = (unsigned char)simple_strtoul(str, &next, base);
1956 }
1957 break;
1958 case 'h':
1959 if (is_sign) {
1960 short *s = (short *)va_arg(args, short *);
1961 *s = (short)simple_strtol(str, &next, base);
1962 } else {
1963 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
1964 *s = (unsigned short)simple_strtoul(str, &next, base);
1965 }
1966 break;
1967 case 'l':
1968 if (is_sign) {
1969 long *l = (long *)va_arg(args, long *);
1970 *l = simple_strtol(str, &next, base);
1971 } else {
1972 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
1973 *l = simple_strtoul(str, &next, base);
1974 }
1975 break;
1976 case 'L':
1977 if (is_sign) {
1978 long long *l = (long long *)va_arg(args, long long *);
1979 *l = simple_strtoll(str, &next, base);
1980 } else {
1981 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
1982 *l = simple_strtoull(str, &next, base);
1983 }
1984 break;
1985 case 'Z':
1986 case 'z':
1987 {
1988 size_t *s = (size_t *)va_arg(args, size_t *);
1989 *s = (size_t)simple_strtoul(str, &next, base);
1990 }
1991 break;
1992 default:
1993 if (is_sign) {
1994 int *i = (int *)va_arg(args, int *);
1995 *i = (int)simple_strtol(str, &next, base);
1996 } else {
1997 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
1998 *i = (unsigned int)simple_strtoul(str, &next, base);
1999 }
2000 break;
2001 }
2002 num++;
2003
2004 if (!next)
2005 break;
2006 str = next;
2007 }
2008
2009 /*
2010 * Now we've come all the way through so either the input string or the
2011 * format ended. In the former case, there can be a %n at the current
2012 * position in the format that needs to be filled.
2013 */
2014 if (*fmt == '%' && *(fmt + 1) == 'n') {
2015 int *p = (int *)va_arg(args, int *);
2016 *p = str - buf;
2017 }
2018
2019 return num;
2020}
2021EXPORT_SYMBOL(vsscanf);
2022
2023/**
2024 * sscanf - Unformat a buffer into a list of arguments
2025 * @buf: input buffer
2026 * @fmt: formatting of buffer
2027 * @...: resulting arguments
2028 */
2029int sscanf(const char *buf, const char *fmt, ...)
2030{
2031 va_list args;
2032 int i;
2033
2034 va_start(args, fmt);
2035 i = vsscanf(buf, fmt, args);
2036 va_end(args);
2037
2038 return i;
2039}
2040EXPORT_SYMBOL(sscanf);