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lib: make _tolower() public
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
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 static unsigned int simple_guess_base(const char *cp)
35 {
36 if (cp[0] == '0') {
37 if (_tolower(cp[1]) == 'x' && isxdigit(cp[2]))
38 return 16;
39 else
40 return 8;
41 } else {
42 return 10;
43 }
44 }
45
46 /**
47 * simple_strtoull - convert a string to an unsigned long long
48 * @cp: The start of the string
49 * @endp: A pointer to the end of the parsed string will be placed here
50 * @base: The number base to use
51 */
52 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
53 {
54 unsigned long long result = 0;
55
56 if (!base)
57 base = simple_guess_base(cp);
58
59 if (base == 16 && cp[0] == '0' && _tolower(cp[1]) == 'x')
60 cp += 2;
61
62 while (isxdigit(*cp)) {
63 unsigned int value;
64
65 value = isdigit(*cp) ? *cp - '0' : _tolower(*cp) - 'a' + 10;
66 if (value >= base)
67 break;
68 result = result * base + value;
69 cp++;
70 }
71 if (endp)
72 *endp = (char *)cp;
73
74 return result;
75 }
76 EXPORT_SYMBOL(simple_strtoull);
77
78 /**
79 * simple_strtoul - convert a string to an unsigned long
80 * @cp: The start of the string
81 * @endp: A pointer to the end of the parsed string will be placed here
82 * @base: The number base to use
83 */
84 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
85 {
86 return simple_strtoull(cp, endp, base);
87 }
88 EXPORT_SYMBOL(simple_strtoul);
89
90 /**
91 * simple_strtol - convert a string to a signed long
92 * @cp: The start of the string
93 * @endp: A pointer to the end of the parsed string will be placed here
94 * @base: The number base to use
95 */
96 long simple_strtol(const char *cp, char **endp, unsigned int base)
97 {
98 if (*cp == '-')
99 return -simple_strtoul(cp + 1, endp, base);
100
101 return simple_strtoul(cp, endp, base);
102 }
103 EXPORT_SYMBOL(simple_strtol);
104
105 /**
106 * simple_strtoll - convert a string to a signed long long
107 * @cp: The start of the string
108 * @endp: A pointer to the end of the parsed string will be placed here
109 * @base: The number base to use
110 */
111 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
112 {
113 if (*cp == '-')
114 return -simple_strtoull(cp + 1, endp, base);
115
116 return simple_strtoull(cp, endp, base);
117 }
118 EXPORT_SYMBOL(simple_strtoll);
119
120 static noinline_for_stack
121 int skip_atoi(const char **s)
122 {
123 int i = 0;
124
125 while (isdigit(**s))
126 i = i*10 + *((*s)++) - '0';
127
128 return i;
129 }
130
131 /* Decimal conversion is by far the most typical, and is used
132 * for /proc and /sys data. This directly impacts e.g. top performance
133 * with many processes running. We optimize it for speed
134 * using code from
135 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
136 * (with permission from the author, Douglas W. Jones). */
137
138 /* Formats correctly any integer in [0,99999].
139 * Outputs from one to five digits depending on input.
140 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
141 static noinline_for_stack
142 char *put_dec_trunc(char *buf, unsigned q)
143 {
144 unsigned d3, d2, d1, d0;
145 d1 = (q>>4) & 0xf;
146 d2 = (q>>8) & 0xf;
147 d3 = (q>>12);
148
149 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
150 q = (d0 * 0xcd) >> 11;
151 d0 = d0 - 10*q;
152 *buf++ = d0 + '0'; /* least significant digit */
153 d1 = q + 9*d3 + 5*d2 + d1;
154 if (d1 != 0) {
155 q = (d1 * 0xcd) >> 11;
156 d1 = d1 - 10*q;
157 *buf++ = d1 + '0'; /* next digit */
158
159 d2 = q + 2*d2;
160 if ((d2 != 0) || (d3 != 0)) {
161 q = (d2 * 0xd) >> 7;
162 d2 = d2 - 10*q;
163 *buf++ = d2 + '0'; /* next digit */
164
165 d3 = q + 4*d3;
166 if (d3 != 0) {
167 q = (d3 * 0xcd) >> 11;
168 d3 = d3 - 10*q;
169 *buf++ = d3 + '0'; /* next digit */
170 if (q != 0)
171 *buf++ = q + '0'; /* most sign. digit */
172 }
173 }
174 }
175
176 return buf;
177 }
178 /* Same with if's removed. Always emits five digits */
179 static noinline_for_stack
180 char *put_dec_full(char *buf, unsigned q)
181 {
182 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
183 /* but anyway, gcc produces better code with full-sized ints */
184 unsigned d3, d2, d1, d0;
185 d1 = (q>>4) & 0xf;
186 d2 = (q>>8) & 0xf;
187 d3 = (q>>12);
188
189 /*
190 * Possible ways to approx. divide by 10
191 * gcc -O2 replaces multiply with shifts and adds
192 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
193 * (x * 0x67) >> 10: 1100111
194 * (x * 0x34) >> 9: 110100 - same
195 * (x * 0x1a) >> 8: 11010 - same
196 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
197 */
198 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
199 q = (d0 * 0xcd) >> 11;
200 d0 = d0 - 10*q;
201 *buf++ = d0 + '0';
202 d1 = q + 9*d3 + 5*d2 + d1;
203 q = (d1 * 0xcd) >> 11;
204 d1 = d1 - 10*q;
205 *buf++ = d1 + '0';
206
207 d2 = q + 2*d2;
208 q = (d2 * 0xd) >> 7;
209 d2 = d2 - 10*q;
210 *buf++ = d2 + '0';
211
212 d3 = q + 4*d3;
213 q = (d3 * 0xcd) >> 11; /* - shorter code */
214 /* q = (d3 * 0x67) >> 10; - would also work */
215 d3 = d3 - 10*q;
216 *buf++ = d3 + '0';
217 *buf++ = q + '0';
218
219 return buf;
220 }
221 /* No inlining helps gcc to use registers better */
222 static noinline_for_stack
223 char *put_dec(char *buf, unsigned long long num)
224 {
225 while (1) {
226 unsigned rem;
227 if (num < 100000)
228 return put_dec_trunc(buf, num);
229 rem = do_div(num, 100000);
230 buf = put_dec_full(buf, rem);
231 }
232 }
233
234 #define ZEROPAD 1 /* pad with zero */
235 #define SIGN 2 /* unsigned/signed long */
236 #define PLUS 4 /* show plus */
237 #define SPACE 8 /* space if plus */
238 #define LEFT 16 /* left justified */
239 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
240 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
241
242 enum format_type {
243 FORMAT_TYPE_NONE, /* Just a string part */
244 FORMAT_TYPE_WIDTH,
245 FORMAT_TYPE_PRECISION,
246 FORMAT_TYPE_CHAR,
247 FORMAT_TYPE_STR,
248 FORMAT_TYPE_PTR,
249 FORMAT_TYPE_PERCENT_CHAR,
250 FORMAT_TYPE_INVALID,
251 FORMAT_TYPE_LONG_LONG,
252 FORMAT_TYPE_ULONG,
253 FORMAT_TYPE_LONG,
254 FORMAT_TYPE_UBYTE,
255 FORMAT_TYPE_BYTE,
256 FORMAT_TYPE_USHORT,
257 FORMAT_TYPE_SHORT,
258 FORMAT_TYPE_UINT,
259 FORMAT_TYPE_INT,
260 FORMAT_TYPE_NRCHARS,
261 FORMAT_TYPE_SIZE_T,
262 FORMAT_TYPE_PTRDIFF
263 };
264
265 struct printf_spec {
266 u8 type; /* format_type enum */
267 u8 flags; /* flags to number() */
268 u8 base; /* number base, 8, 10 or 16 only */
269 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
270 s16 field_width; /* width of output field */
271 s16 precision; /* # of digits/chars */
272 };
273
274 static noinline_for_stack
275 char *number(char *buf, char *end, unsigned long long num,
276 struct printf_spec spec)
277 {
278 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
279 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
280
281 char tmp[66];
282 char sign;
283 char locase;
284 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
285 int i;
286
287 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
288 * produces same digits or (maybe lowercased) letters */
289 locase = (spec.flags & SMALL);
290 if (spec.flags & LEFT)
291 spec.flags &= ~ZEROPAD;
292 sign = 0;
293 if (spec.flags & SIGN) {
294 if ((signed long long)num < 0) {
295 sign = '-';
296 num = -(signed long long)num;
297 spec.field_width--;
298 } else if (spec.flags & PLUS) {
299 sign = '+';
300 spec.field_width--;
301 } else if (spec.flags & SPACE) {
302 sign = ' ';
303 spec.field_width--;
304 }
305 }
306 if (need_pfx) {
307 spec.field_width--;
308 if (spec.base == 16)
309 spec.field_width--;
310 }
311
312 /* generate full string in tmp[], in reverse order */
313 i = 0;
314 if (num == 0)
315 tmp[i++] = '0';
316 /* Generic code, for any base:
317 else do {
318 tmp[i++] = (digits[do_div(num,base)] | locase);
319 } while (num != 0);
320 */
321 else if (spec.base != 10) { /* 8 or 16 */
322 int mask = spec.base - 1;
323 int shift = 3;
324
325 if (spec.base == 16)
326 shift = 4;
327 do {
328 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
329 num >>= shift;
330 } while (num);
331 } else { /* base 10 */
332 i = put_dec(tmp, num) - tmp;
333 }
334
335 /* printing 100 using %2d gives "100", not "00" */
336 if (i > spec.precision)
337 spec.precision = i;
338 /* leading space padding */
339 spec.field_width -= spec.precision;
340 if (!(spec.flags & (ZEROPAD+LEFT))) {
341 while (--spec.field_width >= 0) {
342 if (buf < end)
343 *buf = ' ';
344 ++buf;
345 }
346 }
347 /* sign */
348 if (sign) {
349 if (buf < end)
350 *buf = sign;
351 ++buf;
352 }
353 /* "0x" / "0" prefix */
354 if (need_pfx) {
355 if (buf < end)
356 *buf = '0';
357 ++buf;
358 if (spec.base == 16) {
359 if (buf < end)
360 *buf = ('X' | locase);
361 ++buf;
362 }
363 }
364 /* zero or space padding */
365 if (!(spec.flags & LEFT)) {
366 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
367 while (--spec.field_width >= 0) {
368 if (buf < end)
369 *buf = c;
370 ++buf;
371 }
372 }
373 /* hmm even more zero padding? */
374 while (i <= --spec.precision) {
375 if (buf < end)
376 *buf = '0';
377 ++buf;
378 }
379 /* actual digits of result */
380 while (--i >= 0) {
381 if (buf < end)
382 *buf = tmp[i];
383 ++buf;
384 }
385 /* trailing space padding */
386 while (--spec.field_width >= 0) {
387 if (buf < end)
388 *buf = ' ';
389 ++buf;
390 }
391
392 return buf;
393 }
394
395 static noinline_for_stack
396 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
397 {
398 int len, i;
399
400 if ((unsigned long)s < PAGE_SIZE)
401 s = "(null)";
402
403 len = strnlen(s, spec.precision);
404
405 if (!(spec.flags & LEFT)) {
406 while (len < spec.field_width--) {
407 if (buf < end)
408 *buf = ' ';
409 ++buf;
410 }
411 }
412 for (i = 0; i < len; ++i) {
413 if (buf < end)
414 *buf = *s;
415 ++buf; ++s;
416 }
417 while (len < spec.field_width--) {
418 if (buf < end)
419 *buf = ' ';
420 ++buf;
421 }
422
423 return buf;
424 }
425
426 static noinline_for_stack
427 char *symbol_string(char *buf, char *end, void *ptr,
428 struct printf_spec spec, char ext)
429 {
430 unsigned long value = (unsigned long) ptr;
431 #ifdef CONFIG_KALLSYMS
432 char sym[KSYM_SYMBOL_LEN];
433 if (ext == 'B')
434 sprint_backtrace(sym, value);
435 else if (ext != 'f' && ext != 's')
436 sprint_symbol(sym, value);
437 else
438 kallsyms_lookup(value, NULL, NULL, NULL, sym);
439
440 return string(buf, end, sym, spec);
441 #else
442 spec.field_width = 2 * sizeof(void *);
443 spec.flags |= SPECIAL | SMALL | ZEROPAD;
444 spec.base = 16;
445
446 return number(buf, end, value, spec);
447 #endif
448 }
449
450 static noinline_for_stack
451 char *resource_string(char *buf, char *end, struct resource *res,
452 struct printf_spec spec, const char *fmt)
453 {
454 #ifndef IO_RSRC_PRINTK_SIZE
455 #define IO_RSRC_PRINTK_SIZE 6
456 #endif
457
458 #ifndef MEM_RSRC_PRINTK_SIZE
459 #define MEM_RSRC_PRINTK_SIZE 10
460 #endif
461 static const struct printf_spec io_spec = {
462 .base = 16,
463 .field_width = IO_RSRC_PRINTK_SIZE,
464 .precision = -1,
465 .flags = SPECIAL | SMALL | ZEROPAD,
466 };
467 static const struct printf_spec mem_spec = {
468 .base = 16,
469 .field_width = MEM_RSRC_PRINTK_SIZE,
470 .precision = -1,
471 .flags = SPECIAL | SMALL | ZEROPAD,
472 };
473 static const struct printf_spec bus_spec = {
474 .base = 16,
475 .field_width = 2,
476 .precision = -1,
477 .flags = SMALL | ZEROPAD,
478 };
479 static const struct printf_spec dec_spec = {
480 .base = 10,
481 .precision = -1,
482 .flags = 0,
483 };
484 static const struct printf_spec str_spec = {
485 .field_width = -1,
486 .precision = 10,
487 .flags = LEFT,
488 };
489 static const struct printf_spec flag_spec = {
490 .base = 16,
491 .precision = -1,
492 .flags = SPECIAL | SMALL,
493 };
494
495 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
496 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
497 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
498 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
499 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
500 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
501 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
502 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
503
504 char *p = sym, *pend = sym + sizeof(sym);
505 int decode = (fmt[0] == 'R') ? 1 : 0;
506 const struct printf_spec *specp;
507
508 *p++ = '[';
509 if (res->flags & IORESOURCE_IO) {
510 p = string(p, pend, "io ", str_spec);
511 specp = &io_spec;
512 } else if (res->flags & IORESOURCE_MEM) {
513 p = string(p, pend, "mem ", str_spec);
514 specp = &mem_spec;
515 } else if (res->flags & IORESOURCE_IRQ) {
516 p = string(p, pend, "irq ", str_spec);
517 specp = &dec_spec;
518 } else if (res->flags & IORESOURCE_DMA) {
519 p = string(p, pend, "dma ", str_spec);
520 specp = &dec_spec;
521 } else if (res->flags & IORESOURCE_BUS) {
522 p = string(p, pend, "bus ", str_spec);
523 specp = &bus_spec;
524 } else {
525 p = string(p, pend, "??? ", str_spec);
526 specp = &mem_spec;
527 decode = 0;
528 }
529 p = number(p, pend, res->start, *specp);
530 if (res->start != res->end) {
531 *p++ = '-';
532 p = number(p, pend, res->end, *specp);
533 }
534 if (decode) {
535 if (res->flags & IORESOURCE_MEM_64)
536 p = string(p, pend, " 64bit", str_spec);
537 if (res->flags & IORESOURCE_PREFETCH)
538 p = string(p, pend, " pref", str_spec);
539 if (res->flags & IORESOURCE_WINDOW)
540 p = string(p, pend, " window", str_spec);
541 if (res->flags & IORESOURCE_DISABLED)
542 p = string(p, pend, " disabled", str_spec);
543 } else {
544 p = string(p, pend, " flags ", str_spec);
545 p = number(p, pend, res->flags, flag_spec);
546 }
547 *p++ = ']';
548 *p = '\0';
549
550 return string(buf, end, sym, spec);
551 }
552
553 static noinline_for_stack
554 char *mac_address_string(char *buf, char *end, u8 *addr,
555 struct printf_spec spec, const char *fmt)
556 {
557 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
558 char *p = mac_addr;
559 int i;
560 char separator;
561
562 if (fmt[1] == 'F') { /* FDDI canonical format */
563 separator = '-';
564 } else {
565 separator = ':';
566 }
567
568 for (i = 0; i < 6; i++) {
569 p = pack_hex_byte(p, addr[i]);
570 if (fmt[0] == 'M' && i != 5)
571 *p++ = separator;
572 }
573 *p = '\0';
574
575 return string(buf, end, mac_addr, spec);
576 }
577
578 static noinline_for_stack
579 char *ip4_string(char *p, const u8 *addr, const char *fmt)
580 {
581 int i;
582 bool leading_zeros = (fmt[0] == 'i');
583 int index;
584 int step;
585
586 switch (fmt[2]) {
587 case 'h':
588 #ifdef __BIG_ENDIAN
589 index = 0;
590 step = 1;
591 #else
592 index = 3;
593 step = -1;
594 #endif
595 break;
596 case 'l':
597 index = 3;
598 step = -1;
599 break;
600 case 'n':
601 case 'b':
602 default:
603 index = 0;
604 step = 1;
605 break;
606 }
607 for (i = 0; i < 4; i++) {
608 char temp[3]; /* hold each IP quad in reverse order */
609 int digits = put_dec_trunc(temp, addr[index]) - temp;
610 if (leading_zeros) {
611 if (digits < 3)
612 *p++ = '0';
613 if (digits < 2)
614 *p++ = '0';
615 }
616 /* reverse the digits in the quad */
617 while (digits--)
618 *p++ = temp[digits];
619 if (i < 3)
620 *p++ = '.';
621 index += step;
622 }
623 *p = '\0';
624
625 return p;
626 }
627
628 static noinline_for_stack
629 char *ip6_compressed_string(char *p, const char *addr)
630 {
631 int i, j, range;
632 unsigned char zerolength[8];
633 int longest = 1;
634 int colonpos = -1;
635 u16 word;
636 u8 hi, lo;
637 bool needcolon = false;
638 bool useIPv4;
639 struct in6_addr in6;
640
641 memcpy(&in6, addr, sizeof(struct in6_addr));
642
643 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
644
645 memset(zerolength, 0, sizeof(zerolength));
646
647 if (useIPv4)
648 range = 6;
649 else
650 range = 8;
651
652 /* find position of longest 0 run */
653 for (i = 0; i < range; i++) {
654 for (j = i; j < range; j++) {
655 if (in6.s6_addr16[j] != 0)
656 break;
657 zerolength[i]++;
658 }
659 }
660 for (i = 0; i < range; i++) {
661 if (zerolength[i] > longest) {
662 longest = zerolength[i];
663 colonpos = i;
664 }
665 }
666 if (longest == 1) /* don't compress a single 0 */
667 colonpos = -1;
668
669 /* emit address */
670 for (i = 0; i < range; i++) {
671 if (i == colonpos) {
672 if (needcolon || i == 0)
673 *p++ = ':';
674 *p++ = ':';
675 needcolon = false;
676 i += longest - 1;
677 continue;
678 }
679 if (needcolon) {
680 *p++ = ':';
681 needcolon = false;
682 }
683 /* hex u16 without leading 0s */
684 word = ntohs(in6.s6_addr16[i]);
685 hi = word >> 8;
686 lo = word & 0xff;
687 if (hi) {
688 if (hi > 0x0f)
689 p = pack_hex_byte(p, hi);
690 else
691 *p++ = hex_asc_lo(hi);
692 p = pack_hex_byte(p, lo);
693 }
694 else if (lo > 0x0f)
695 p = pack_hex_byte(p, lo);
696 else
697 *p++ = hex_asc_lo(lo);
698 needcolon = true;
699 }
700
701 if (useIPv4) {
702 if (needcolon)
703 *p++ = ':';
704 p = ip4_string(p, &in6.s6_addr[12], "I4");
705 }
706 *p = '\0';
707
708 return p;
709 }
710
711 static noinline_for_stack
712 char *ip6_string(char *p, const char *addr, const char *fmt)
713 {
714 int i;
715
716 for (i = 0; i < 8; i++) {
717 p = pack_hex_byte(p, *addr++);
718 p = pack_hex_byte(p, *addr++);
719 if (fmt[0] == 'I' && i != 7)
720 *p++ = ':';
721 }
722 *p = '\0';
723
724 return p;
725 }
726
727 static noinline_for_stack
728 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
729 struct printf_spec spec, const char *fmt)
730 {
731 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
732
733 if (fmt[0] == 'I' && fmt[2] == 'c')
734 ip6_compressed_string(ip6_addr, addr);
735 else
736 ip6_string(ip6_addr, addr, fmt);
737
738 return string(buf, end, ip6_addr, spec);
739 }
740
741 static noinline_for_stack
742 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
743 struct printf_spec spec, const char *fmt)
744 {
745 char ip4_addr[sizeof("255.255.255.255")];
746
747 ip4_string(ip4_addr, addr, fmt);
748
749 return string(buf, end, ip4_addr, spec);
750 }
751
752 static noinline_for_stack
753 char *uuid_string(char *buf, char *end, const u8 *addr,
754 struct printf_spec spec, const char *fmt)
755 {
756 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
757 char *p = uuid;
758 int i;
759 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
760 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
761 const u8 *index = be;
762 bool uc = false;
763
764 switch (*(++fmt)) {
765 case 'L':
766 uc = true; /* fall-through */
767 case 'l':
768 index = le;
769 break;
770 case 'B':
771 uc = true;
772 break;
773 }
774
775 for (i = 0; i < 16; i++) {
776 p = pack_hex_byte(p, addr[index[i]]);
777 switch (i) {
778 case 3:
779 case 5:
780 case 7:
781 case 9:
782 *p++ = '-';
783 break;
784 }
785 }
786
787 *p = 0;
788
789 if (uc) {
790 p = uuid;
791 do {
792 *p = toupper(*p);
793 } while (*(++p));
794 }
795
796 return string(buf, end, uuid, spec);
797 }
798
799 int kptr_restrict __read_mostly;
800
801 /*
802 * Show a '%p' thing. A kernel extension is that the '%p' is followed
803 * by an extra set of alphanumeric characters that are extended format
804 * specifiers.
805 *
806 * Right now we handle:
807 *
808 * - 'F' For symbolic function descriptor pointers with offset
809 * - 'f' For simple symbolic function names without offset
810 * - 'S' For symbolic direct pointers with offset
811 * - 's' For symbolic direct pointers without offset
812 * - 'B' For backtraced symbolic direct pointers with offset
813 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
814 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
815 * - 'M' For a 6-byte MAC address, it prints the address in the
816 * usual colon-separated hex notation
817 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
818 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
819 * with a dash-separated hex notation
820 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
821 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
822 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
823 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
824 * IPv6 omits the colons (01020304...0f)
825 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
826 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
827 * - 'I6c' for IPv6 addresses printed as specified by
828 * http://tools.ietf.org/html/rfc5952
829 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
830 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
831 * Options for %pU are:
832 * b big endian lower case hex (default)
833 * B big endian UPPER case hex
834 * l little endian lower case hex
835 * L little endian UPPER case hex
836 * big endian output byte order is:
837 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
838 * little endian output byte order is:
839 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
840 * - 'V' For a struct va_format which contains a format string * and va_list *,
841 * call vsnprintf(->format, *->va_list).
842 * Implements a "recursive vsnprintf".
843 * Do not use this feature without some mechanism to verify the
844 * correctness of the format string and va_list arguments.
845 * - 'K' For a kernel pointer that should be hidden from unprivileged users
846 *
847 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
848 * function pointers are really function descriptors, which contain a
849 * pointer to the real address.
850 */
851 static noinline_for_stack
852 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
853 struct printf_spec spec)
854 {
855 if (!ptr && *fmt != 'K') {
856 /*
857 * Print (null) with the same width as a pointer so it makes
858 * tabular output look nice.
859 */
860 if (spec.field_width == -1)
861 spec.field_width = 2 * sizeof(void *);
862 return string(buf, end, "(null)", spec);
863 }
864
865 switch (*fmt) {
866 case 'F':
867 case 'f':
868 ptr = dereference_function_descriptor(ptr);
869 /* Fallthrough */
870 case 'S':
871 case 's':
872 case 'B':
873 return symbol_string(buf, end, ptr, spec, *fmt);
874 case 'R':
875 case 'r':
876 return resource_string(buf, end, ptr, spec, fmt);
877 case 'M': /* Colon separated: 00:01:02:03:04:05 */
878 case 'm': /* Contiguous: 000102030405 */
879 /* [mM]F (FDDI, bit reversed) */
880 return mac_address_string(buf, end, ptr, spec, fmt);
881 case 'I': /* Formatted IP supported
882 * 4: 1.2.3.4
883 * 6: 0001:0203:...:0708
884 * 6c: 1::708 or 1::1.2.3.4
885 */
886 case 'i': /* Contiguous:
887 * 4: 001.002.003.004
888 * 6: 000102...0f
889 */
890 switch (fmt[1]) {
891 case '6':
892 return ip6_addr_string(buf, end, ptr, spec, fmt);
893 case '4':
894 return ip4_addr_string(buf, end, ptr, spec, fmt);
895 }
896 break;
897 case 'U':
898 return uuid_string(buf, end, ptr, spec, fmt);
899 case 'V':
900 return buf + vsnprintf(buf, end > buf ? end - buf : 0,
901 ((struct va_format *)ptr)->fmt,
902 *(((struct va_format *)ptr)->va));
903 case 'K':
904 /*
905 * %pK cannot be used in IRQ context because its test
906 * for CAP_SYSLOG would be meaningless.
907 */
908 if (in_irq() || in_serving_softirq() || in_nmi()) {
909 if (spec.field_width == -1)
910 spec.field_width = 2 * sizeof(void *);
911 return string(buf, end, "pK-error", spec);
912 }
913 if (!((kptr_restrict == 0) ||
914 (kptr_restrict == 1 &&
915 has_capability_noaudit(current, CAP_SYSLOG))))
916 ptr = NULL;
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 */
949 static noinline_for_stack
950 int 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
1017 precision:
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
1033 qualifier:
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
1150 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1151 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1152 * case.
1153 * %n is ignored
1154 *
1155 * The return value is the number of characters which would
1156 * be generated for the given input, excluding the trailing
1157 * '\0', as per ISO C99. If you want to have the exact
1158 * number of characters written into @buf as return value
1159 * (not including the trailing '\0'), use vscnprintf(). If the
1160 * return is greater than or equal to @size, the resulting
1161 * string is truncated.
1162 *
1163 * If you're not already dealing with a va_list consider using snprintf().
1164 */
1165 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1166 {
1167 unsigned long long num;
1168 char *str, *end;
1169 struct printf_spec spec = {0};
1170
1171 /* Reject out-of-range values early. Large positive sizes are
1172 used for unknown buffer sizes. */
1173 if (WARN_ON_ONCE((int) size < 0))
1174 return 0;
1175
1176 str = buf;
1177 end = buf + size;
1178
1179 /* Make sure end is always >= buf */
1180 if (end < buf) {
1181 end = ((void *)-1);
1182 size = end - buf;
1183 }
1184
1185 while (*fmt) {
1186 const char *old_fmt = fmt;
1187 int read = format_decode(fmt, &spec);
1188
1189 fmt += read;
1190
1191 switch (spec.type) {
1192 case FORMAT_TYPE_NONE: {
1193 int copy = read;
1194 if (str < end) {
1195 if (copy > end - str)
1196 copy = end - str;
1197 memcpy(str, old_fmt, copy);
1198 }
1199 str += read;
1200 break;
1201 }
1202
1203 case FORMAT_TYPE_WIDTH:
1204 spec.field_width = va_arg(args, int);
1205 break;
1206
1207 case FORMAT_TYPE_PRECISION:
1208 spec.precision = va_arg(args, int);
1209 break;
1210
1211 case FORMAT_TYPE_CHAR: {
1212 char c;
1213
1214 if (!(spec.flags & LEFT)) {
1215 while (--spec.field_width > 0) {
1216 if (str < end)
1217 *str = ' ';
1218 ++str;
1219
1220 }
1221 }
1222 c = (unsigned char) va_arg(args, int);
1223 if (str < end)
1224 *str = c;
1225 ++str;
1226 while (--spec.field_width > 0) {
1227 if (str < end)
1228 *str = ' ';
1229 ++str;
1230 }
1231 break;
1232 }
1233
1234 case FORMAT_TYPE_STR:
1235 str = string(str, end, va_arg(args, char *), spec);
1236 break;
1237
1238 case FORMAT_TYPE_PTR:
1239 str = pointer(fmt+1, str, end, va_arg(args, void *),
1240 spec);
1241 while (isalnum(*fmt))
1242 fmt++;
1243 break;
1244
1245 case FORMAT_TYPE_PERCENT_CHAR:
1246 if (str < end)
1247 *str = '%';
1248 ++str;
1249 break;
1250
1251 case FORMAT_TYPE_INVALID:
1252 if (str < end)
1253 *str = '%';
1254 ++str;
1255 break;
1256
1257 case FORMAT_TYPE_NRCHARS: {
1258 u8 qualifier = spec.qualifier;
1259
1260 if (qualifier == 'l') {
1261 long *ip = va_arg(args, long *);
1262 *ip = (str - buf);
1263 } else if (_tolower(qualifier) == 'z') {
1264 size_t *ip = va_arg(args, size_t *);
1265 *ip = (str - buf);
1266 } else {
1267 int *ip = va_arg(args, int *);
1268 *ip = (str - buf);
1269 }
1270 break;
1271 }
1272
1273 default:
1274 switch (spec.type) {
1275 case FORMAT_TYPE_LONG_LONG:
1276 num = va_arg(args, long long);
1277 break;
1278 case FORMAT_TYPE_ULONG:
1279 num = va_arg(args, unsigned long);
1280 break;
1281 case FORMAT_TYPE_LONG:
1282 num = va_arg(args, long);
1283 break;
1284 case FORMAT_TYPE_SIZE_T:
1285 num = va_arg(args, size_t);
1286 break;
1287 case FORMAT_TYPE_PTRDIFF:
1288 num = va_arg(args, ptrdiff_t);
1289 break;
1290 case FORMAT_TYPE_UBYTE:
1291 num = (unsigned char) va_arg(args, int);
1292 break;
1293 case FORMAT_TYPE_BYTE:
1294 num = (signed char) va_arg(args, int);
1295 break;
1296 case FORMAT_TYPE_USHORT:
1297 num = (unsigned short) va_arg(args, int);
1298 break;
1299 case FORMAT_TYPE_SHORT:
1300 num = (short) va_arg(args, int);
1301 break;
1302 case FORMAT_TYPE_INT:
1303 num = (int) va_arg(args, int);
1304 break;
1305 default:
1306 num = va_arg(args, unsigned int);
1307 }
1308
1309 str = number(str, end, num, spec);
1310 }
1311 }
1312
1313 if (size > 0) {
1314 if (str < end)
1315 *str = '\0';
1316 else
1317 end[-1] = '\0';
1318 }
1319
1320 /* the trailing null byte doesn't count towards the total */
1321 return str-buf;
1322
1323 }
1324 EXPORT_SYMBOL(vsnprintf);
1325
1326 /**
1327 * vscnprintf - Format a string and place it in a buffer
1328 * @buf: The buffer to place the result into
1329 * @size: The size of the buffer, including the trailing null space
1330 * @fmt: The format string to use
1331 * @args: Arguments for the format string
1332 *
1333 * The return value is the number of characters which have been written into
1334 * the @buf not including the trailing '\0'. If @size is == 0 the function
1335 * returns 0.
1336 *
1337 * If you're not already dealing with a va_list consider using scnprintf().
1338 *
1339 * See the vsnprintf() documentation for format string extensions over C99.
1340 */
1341 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1342 {
1343 int i;
1344
1345 i = vsnprintf(buf, size, fmt, args);
1346
1347 if (likely(i < size))
1348 return i;
1349 if (size != 0)
1350 return size - 1;
1351 return 0;
1352 }
1353 EXPORT_SYMBOL(vscnprintf);
1354
1355 /**
1356 * snprintf - Format a string and place it in a buffer
1357 * @buf: The buffer to place the result into
1358 * @size: The size of the buffer, including the trailing null space
1359 * @fmt: The format string to use
1360 * @...: Arguments for the format string
1361 *
1362 * The return value is the number of characters which would be
1363 * generated for the given input, excluding the trailing null,
1364 * as per ISO C99. If the return is greater than or equal to
1365 * @size, the resulting string is truncated.
1366 *
1367 * See the vsnprintf() documentation for format string extensions over C99.
1368 */
1369 int snprintf(char *buf, size_t size, const char *fmt, ...)
1370 {
1371 va_list args;
1372 int i;
1373
1374 va_start(args, fmt);
1375 i = vsnprintf(buf, size, fmt, args);
1376 va_end(args);
1377
1378 return i;
1379 }
1380 EXPORT_SYMBOL(snprintf);
1381
1382 /**
1383 * scnprintf - Format a string and place it in a buffer
1384 * @buf: The buffer to place the result into
1385 * @size: The size of the buffer, including the trailing null space
1386 * @fmt: The format string to use
1387 * @...: Arguments for the format string
1388 *
1389 * The return value is the number of characters written into @buf not including
1390 * the trailing '\0'. If @size is == 0 the function returns 0.
1391 */
1392
1393 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1394 {
1395 va_list args;
1396 int i;
1397
1398 va_start(args, fmt);
1399 i = vscnprintf(buf, size, fmt, args);
1400 va_end(args);
1401
1402 return i;
1403 }
1404 EXPORT_SYMBOL(scnprintf);
1405
1406 /**
1407 * vsprintf - Format a string and place it in a buffer
1408 * @buf: The buffer to place the result into
1409 * @fmt: The format string to use
1410 * @args: Arguments for the format string
1411 *
1412 * The function returns the number of characters written
1413 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1414 * buffer overflows.
1415 *
1416 * If you're not already dealing with a va_list consider using sprintf().
1417 *
1418 * See the vsnprintf() documentation for format string extensions over C99.
1419 */
1420 int vsprintf(char *buf, const char *fmt, va_list args)
1421 {
1422 return vsnprintf(buf, INT_MAX, fmt, args);
1423 }
1424 EXPORT_SYMBOL(vsprintf);
1425
1426 /**
1427 * sprintf - Format a string and place it in a buffer
1428 * @buf: The buffer to place the result into
1429 * @fmt: The format string to use
1430 * @...: Arguments for the format string
1431 *
1432 * The function returns the number of characters written
1433 * into @buf. Use snprintf() or scnprintf() in order to avoid
1434 * buffer overflows.
1435 *
1436 * See the vsnprintf() documentation for format string extensions over C99.
1437 */
1438 int sprintf(char *buf, const char *fmt, ...)
1439 {
1440 va_list args;
1441 int i;
1442
1443 va_start(args, fmt);
1444 i = vsnprintf(buf, INT_MAX, fmt, args);
1445 va_end(args);
1446
1447 return i;
1448 }
1449 EXPORT_SYMBOL(sprintf);
1450
1451 #ifdef CONFIG_BINARY_PRINTF
1452 /*
1453 * bprintf service:
1454 * vbin_printf() - VA arguments to binary data
1455 * bstr_printf() - Binary data to text string
1456 */
1457
1458 /**
1459 * vbin_printf - Parse a format string and place args' binary value in a buffer
1460 * @bin_buf: The buffer to place args' binary value
1461 * @size: The size of the buffer(by words(32bits), not characters)
1462 * @fmt: The format string to use
1463 * @args: Arguments for the format string
1464 *
1465 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1466 * is skiped.
1467 *
1468 * The return value is the number of words(32bits) which would be generated for
1469 * the given input.
1470 *
1471 * NOTE:
1472 * If the return value is greater than @size, the resulting bin_buf is NOT
1473 * valid for bstr_printf().
1474 */
1475 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1476 {
1477 struct printf_spec spec = {0};
1478 char *str, *end;
1479
1480 str = (char *)bin_buf;
1481 end = (char *)(bin_buf + size);
1482
1483 #define save_arg(type) \
1484 do { \
1485 if (sizeof(type) == 8) { \
1486 unsigned long long value; \
1487 str = PTR_ALIGN(str, sizeof(u32)); \
1488 value = va_arg(args, unsigned long long); \
1489 if (str + sizeof(type) <= end) { \
1490 *(u32 *)str = *(u32 *)&value; \
1491 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1492 } \
1493 } else { \
1494 unsigned long value; \
1495 str = PTR_ALIGN(str, sizeof(type)); \
1496 value = va_arg(args, int); \
1497 if (str + sizeof(type) <= end) \
1498 *(typeof(type) *)str = (type)value; \
1499 } \
1500 str += sizeof(type); \
1501 } while (0)
1502
1503 while (*fmt) {
1504 int read = format_decode(fmt, &spec);
1505
1506 fmt += read;
1507
1508 switch (spec.type) {
1509 case FORMAT_TYPE_NONE:
1510 case FORMAT_TYPE_INVALID:
1511 case FORMAT_TYPE_PERCENT_CHAR:
1512 break;
1513
1514 case FORMAT_TYPE_WIDTH:
1515 case FORMAT_TYPE_PRECISION:
1516 save_arg(int);
1517 break;
1518
1519 case FORMAT_TYPE_CHAR:
1520 save_arg(char);
1521 break;
1522
1523 case FORMAT_TYPE_STR: {
1524 const char *save_str = va_arg(args, char *);
1525 size_t len;
1526
1527 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1528 || (unsigned long)save_str < PAGE_SIZE)
1529 save_str = "(null)";
1530 len = strlen(save_str) + 1;
1531 if (str + len < end)
1532 memcpy(str, save_str, len);
1533 str += len;
1534 break;
1535 }
1536
1537 case FORMAT_TYPE_PTR:
1538 save_arg(void *);
1539 /* skip all alphanumeric pointer suffixes */
1540 while (isalnum(*fmt))
1541 fmt++;
1542 break;
1543
1544 case FORMAT_TYPE_NRCHARS: {
1545 /* skip %n 's argument */
1546 u8 qualifier = spec.qualifier;
1547 void *skip_arg;
1548 if (qualifier == 'l')
1549 skip_arg = va_arg(args, long *);
1550 else if (_tolower(qualifier) == 'z')
1551 skip_arg = va_arg(args, size_t *);
1552 else
1553 skip_arg = va_arg(args, int *);
1554 break;
1555 }
1556
1557 default:
1558 switch (spec.type) {
1559
1560 case FORMAT_TYPE_LONG_LONG:
1561 save_arg(long long);
1562 break;
1563 case FORMAT_TYPE_ULONG:
1564 case FORMAT_TYPE_LONG:
1565 save_arg(unsigned long);
1566 break;
1567 case FORMAT_TYPE_SIZE_T:
1568 save_arg(size_t);
1569 break;
1570 case FORMAT_TYPE_PTRDIFF:
1571 save_arg(ptrdiff_t);
1572 break;
1573 case FORMAT_TYPE_UBYTE:
1574 case FORMAT_TYPE_BYTE:
1575 save_arg(char);
1576 break;
1577 case FORMAT_TYPE_USHORT:
1578 case FORMAT_TYPE_SHORT:
1579 save_arg(short);
1580 break;
1581 default:
1582 save_arg(int);
1583 }
1584 }
1585 }
1586
1587 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1588 #undef save_arg
1589 }
1590 EXPORT_SYMBOL_GPL(vbin_printf);
1591
1592 /**
1593 * bstr_printf - Format a string from binary arguments and place it in a buffer
1594 * @buf: The buffer to place the result into
1595 * @size: The size of the buffer, including the trailing null space
1596 * @fmt: The format string to use
1597 * @bin_buf: Binary arguments for the format string
1598 *
1599 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1600 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1601 * a binary buffer that generated by vbin_printf.
1602 *
1603 * The format follows C99 vsnprintf, but has some extensions:
1604 * see vsnprintf comment for details.
1605 *
1606 * The return value is the number of characters which would
1607 * be generated for the given input, excluding the trailing
1608 * '\0', as per ISO C99. If you want to have the exact
1609 * number of characters written into @buf as return value
1610 * (not including the trailing '\0'), use vscnprintf(). If the
1611 * return is greater than or equal to @size, the resulting
1612 * string is truncated.
1613 */
1614 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1615 {
1616 struct printf_spec spec = {0};
1617 char *str, *end;
1618 const char *args = (const char *)bin_buf;
1619
1620 if (WARN_ON_ONCE((int) size < 0))
1621 return 0;
1622
1623 str = buf;
1624 end = buf + size;
1625
1626 #define get_arg(type) \
1627 ({ \
1628 typeof(type) value; \
1629 if (sizeof(type) == 8) { \
1630 args = PTR_ALIGN(args, sizeof(u32)); \
1631 *(u32 *)&value = *(u32 *)args; \
1632 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1633 } else { \
1634 args = PTR_ALIGN(args, sizeof(type)); \
1635 value = *(typeof(type) *)args; \
1636 } \
1637 args += sizeof(type); \
1638 value; \
1639 })
1640
1641 /* Make sure end is always >= buf */
1642 if (end < buf) {
1643 end = ((void *)-1);
1644 size = end - buf;
1645 }
1646
1647 while (*fmt) {
1648 const char *old_fmt = fmt;
1649 int read = format_decode(fmt, &spec);
1650
1651 fmt += read;
1652
1653 switch (spec.type) {
1654 case FORMAT_TYPE_NONE: {
1655 int copy = read;
1656 if (str < end) {
1657 if (copy > end - str)
1658 copy = end - str;
1659 memcpy(str, old_fmt, copy);
1660 }
1661 str += read;
1662 break;
1663 }
1664
1665 case FORMAT_TYPE_WIDTH:
1666 spec.field_width = get_arg(int);
1667 break;
1668
1669 case FORMAT_TYPE_PRECISION:
1670 spec.precision = get_arg(int);
1671 break;
1672
1673 case FORMAT_TYPE_CHAR: {
1674 char c;
1675
1676 if (!(spec.flags & LEFT)) {
1677 while (--spec.field_width > 0) {
1678 if (str < end)
1679 *str = ' ';
1680 ++str;
1681 }
1682 }
1683 c = (unsigned char) get_arg(char);
1684 if (str < end)
1685 *str = c;
1686 ++str;
1687 while (--spec.field_width > 0) {
1688 if (str < end)
1689 *str = ' ';
1690 ++str;
1691 }
1692 break;
1693 }
1694
1695 case FORMAT_TYPE_STR: {
1696 const char *str_arg = args;
1697 args += strlen(str_arg) + 1;
1698 str = string(str, end, (char *)str_arg, spec);
1699 break;
1700 }
1701
1702 case FORMAT_TYPE_PTR:
1703 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1704 while (isalnum(*fmt))
1705 fmt++;
1706 break;
1707
1708 case FORMAT_TYPE_PERCENT_CHAR:
1709 case FORMAT_TYPE_INVALID:
1710 if (str < end)
1711 *str = '%';
1712 ++str;
1713 break;
1714
1715 case FORMAT_TYPE_NRCHARS:
1716 /* skip */
1717 break;
1718
1719 default: {
1720 unsigned long long num;
1721
1722 switch (spec.type) {
1723
1724 case FORMAT_TYPE_LONG_LONG:
1725 num = get_arg(long long);
1726 break;
1727 case FORMAT_TYPE_ULONG:
1728 case FORMAT_TYPE_LONG:
1729 num = get_arg(unsigned long);
1730 break;
1731 case FORMAT_TYPE_SIZE_T:
1732 num = get_arg(size_t);
1733 break;
1734 case FORMAT_TYPE_PTRDIFF:
1735 num = get_arg(ptrdiff_t);
1736 break;
1737 case FORMAT_TYPE_UBYTE:
1738 num = get_arg(unsigned char);
1739 break;
1740 case FORMAT_TYPE_BYTE:
1741 num = get_arg(signed char);
1742 break;
1743 case FORMAT_TYPE_USHORT:
1744 num = get_arg(unsigned short);
1745 break;
1746 case FORMAT_TYPE_SHORT:
1747 num = get_arg(short);
1748 break;
1749 case FORMAT_TYPE_UINT:
1750 num = get_arg(unsigned int);
1751 break;
1752 default:
1753 num = get_arg(int);
1754 }
1755
1756 str = number(str, end, num, spec);
1757 } /* default: */
1758 } /* switch(spec.type) */
1759 } /* while(*fmt) */
1760
1761 if (size > 0) {
1762 if (str < end)
1763 *str = '\0';
1764 else
1765 end[-1] = '\0';
1766 }
1767
1768 #undef get_arg
1769
1770 /* the trailing null byte doesn't count towards the total */
1771 return str - buf;
1772 }
1773 EXPORT_SYMBOL_GPL(bstr_printf);
1774
1775 /**
1776 * bprintf - Parse a format string and place args' binary value in a buffer
1777 * @bin_buf: The buffer to place args' binary value
1778 * @size: The size of the buffer(by words(32bits), not characters)
1779 * @fmt: The format string to use
1780 * @...: Arguments for the format string
1781 *
1782 * The function returns the number of words(u32) written
1783 * into @bin_buf.
1784 */
1785 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1786 {
1787 va_list args;
1788 int ret;
1789
1790 va_start(args, fmt);
1791 ret = vbin_printf(bin_buf, size, fmt, args);
1792 va_end(args);
1793
1794 return ret;
1795 }
1796 EXPORT_SYMBOL_GPL(bprintf);
1797
1798 #endif /* CONFIG_BINARY_PRINTF */
1799
1800 /**
1801 * vsscanf - Unformat a buffer into a list of arguments
1802 * @buf: input buffer
1803 * @fmt: format of buffer
1804 * @args: arguments
1805 */
1806 int vsscanf(const char *buf, const char *fmt, va_list args)
1807 {
1808 const char *str = buf;
1809 char *next;
1810 char digit;
1811 int num = 0;
1812 u8 qualifier;
1813 u8 base;
1814 s16 field_width;
1815 bool is_sign;
1816
1817 while (*fmt && *str) {
1818 /* skip any white space in format */
1819 /* white space in format matchs any amount of
1820 * white space, including none, in the input.
1821 */
1822 if (isspace(*fmt)) {
1823 fmt = skip_spaces(++fmt);
1824 str = skip_spaces(str);
1825 }
1826
1827 /* anything that is not a conversion must match exactly */
1828 if (*fmt != '%' && *fmt) {
1829 if (*fmt++ != *str++)
1830 break;
1831 continue;
1832 }
1833
1834 if (!*fmt)
1835 break;
1836 ++fmt;
1837
1838 /* skip this conversion.
1839 * advance both strings to next white space
1840 */
1841 if (*fmt == '*') {
1842 while (!isspace(*fmt) && *fmt != '%' && *fmt)
1843 fmt++;
1844 while (!isspace(*str) && *str)
1845 str++;
1846 continue;
1847 }
1848
1849 /* get field width */
1850 field_width = -1;
1851 if (isdigit(*fmt))
1852 field_width = skip_atoi(&fmt);
1853
1854 /* get conversion qualifier */
1855 qualifier = -1;
1856 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
1857 _tolower(*fmt) == 'z') {
1858 qualifier = *fmt++;
1859 if (unlikely(qualifier == *fmt)) {
1860 if (qualifier == 'h') {
1861 qualifier = 'H';
1862 fmt++;
1863 } else if (qualifier == 'l') {
1864 qualifier = 'L';
1865 fmt++;
1866 }
1867 }
1868 }
1869
1870 if (!*fmt || !*str)
1871 break;
1872
1873 base = 10;
1874 is_sign = 0;
1875
1876 switch (*fmt++) {
1877 case 'c':
1878 {
1879 char *s = (char *)va_arg(args, char*);
1880 if (field_width == -1)
1881 field_width = 1;
1882 do {
1883 *s++ = *str++;
1884 } while (--field_width > 0 && *str);
1885 num++;
1886 }
1887 continue;
1888 case 's':
1889 {
1890 char *s = (char *)va_arg(args, char *);
1891 if (field_width == -1)
1892 field_width = SHRT_MAX;
1893 /* first, skip leading white space in buffer */
1894 str = skip_spaces(str);
1895
1896 /* now copy until next white space */
1897 while (*str && !isspace(*str) && field_width--)
1898 *s++ = *str++;
1899 *s = '\0';
1900 num++;
1901 }
1902 continue;
1903 case 'n':
1904 /* return number of characters read so far */
1905 {
1906 int *i = (int *)va_arg(args, int*);
1907 *i = str - buf;
1908 }
1909 continue;
1910 case 'o':
1911 base = 8;
1912 break;
1913 case 'x':
1914 case 'X':
1915 base = 16;
1916 break;
1917 case 'i':
1918 base = 0;
1919 case 'd':
1920 is_sign = 1;
1921 case 'u':
1922 break;
1923 case '%':
1924 /* looking for '%' in str */
1925 if (*str++ != '%')
1926 return num;
1927 continue;
1928 default:
1929 /* invalid format; stop here */
1930 return num;
1931 }
1932
1933 /* have some sort of integer conversion.
1934 * first, skip white space in buffer.
1935 */
1936 str = skip_spaces(str);
1937
1938 digit = *str;
1939 if (is_sign && digit == '-')
1940 digit = *(str + 1);
1941
1942 if (!digit
1943 || (base == 16 && !isxdigit(digit))
1944 || (base == 10 && !isdigit(digit))
1945 || (base == 8 && (!isdigit(digit) || digit > '7'))
1946 || (base == 0 && !isdigit(digit)))
1947 break;
1948
1949 switch (qualifier) {
1950 case 'H': /* that's 'hh' in format */
1951 if (is_sign) {
1952 signed char *s = (signed char *)va_arg(args, signed char *);
1953 *s = (signed char)simple_strtol(str, &next, base);
1954 } else {
1955 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
1956 *s = (unsigned char)simple_strtoul(str, &next, base);
1957 }
1958 break;
1959 case 'h':
1960 if (is_sign) {
1961 short *s = (short *)va_arg(args, short *);
1962 *s = (short)simple_strtol(str, &next, base);
1963 } else {
1964 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
1965 *s = (unsigned short)simple_strtoul(str, &next, base);
1966 }
1967 break;
1968 case 'l':
1969 if (is_sign) {
1970 long *l = (long *)va_arg(args, long *);
1971 *l = simple_strtol(str, &next, base);
1972 } else {
1973 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
1974 *l = simple_strtoul(str, &next, base);
1975 }
1976 break;
1977 case 'L':
1978 if (is_sign) {
1979 long long *l = (long long *)va_arg(args, long long *);
1980 *l = simple_strtoll(str, &next, base);
1981 } else {
1982 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
1983 *l = simple_strtoull(str, &next, base);
1984 }
1985 break;
1986 case 'Z':
1987 case 'z':
1988 {
1989 size_t *s = (size_t *)va_arg(args, size_t *);
1990 *s = (size_t)simple_strtoul(str, &next, base);
1991 }
1992 break;
1993 default:
1994 if (is_sign) {
1995 int *i = (int *)va_arg(args, int *);
1996 *i = (int)simple_strtol(str, &next, base);
1997 } else {
1998 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
1999 *i = (unsigned int)simple_strtoul(str, &next, base);
2000 }
2001 break;
2002 }
2003 num++;
2004
2005 if (!next)
2006 break;
2007 str = next;
2008 }
2009
2010 /*
2011 * Now we've come all the way through so either the input string or the
2012 * format ended. In the former case, there can be a %n at the current
2013 * position in the format that needs to be filled.
2014 */
2015 if (*fmt == '%' && *(fmt + 1) == 'n') {
2016 int *p = (int *)va_arg(args, int *);
2017 *p = str - buf;
2018 }
2019
2020 return num;
2021 }
2022 EXPORT_SYMBOL(vsscanf);
2023
2024 /**
2025 * sscanf - Unformat a buffer into a list of arguments
2026 * @buf: input buffer
2027 * @fmt: formatting of buffer
2028 * @...: resulting arguments
2029 */
2030 int sscanf(const char *buf, const char *fmt, ...)
2031 {
2032 va_list args;
2033 int i;
2034
2035 va_start(args, fmt);
2036 i = vsscanf(buf, fmt, args);
2037 va_end(args);
2038
2039 return i;
2040 }
2041 EXPORT_SYMBOL(sscanf);
kernel source for telekom puls (alcatel/mediatek)