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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / lib / vsprintf.c
blobb02f036afbcaa8ca9acedbe8c5f99b7df08da76c
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 /* Works only for digits and letters, but small and fast */
35 #define TOLOWER(x) ((x) | 0x20)
36
37 static unsigned int simple_guess_base(const char *cp)
38 {
39 if (cp[0] == '0') {
40 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
41 return 16;
42 else
43 return 8;
44 } else {
45 return 10;
46 }
47 }
48
49 /**
50 * simple_strtoull - convert a string to an unsigned long long
51 * @cp: The start of the string
52 * @endp: A pointer to the end of the parsed string will be placed here
53 * @base: The number base to use
54 */
55 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
56 {
57 unsigned long long result = 0;
58
59 if (!base)
60 base = simple_guess_base(cp);
61
62 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
63 cp += 2;
64
65 while (isxdigit(*cp)) {
66 unsigned int value;
67
68 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
69 if (value >= base)
70 break;
71 result = result * base + value;
72 cp++;
73 }
74 if (endp)
75 *endp = (char *)cp;
76
77 return result;
78 }
79 EXPORT_SYMBOL(simple_strtoull);
80
81 /**
82 * simple_strtoul - convert a string to an unsigned long
83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
86 */
87 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
88 {
89 return simple_strtoull(cp, endp, base);
90 }
91 EXPORT_SYMBOL(simple_strtoul);
92
93 /**
94 * simple_strtol - convert a string to a signed long
95 * @cp: The start of the string
96 * @endp: A pointer to the end of the parsed string will be placed here
97 * @base: The number base to use
98 */
99 long simple_strtol(const char *cp, char **endp, unsigned int base)
100 {
101 if (*cp == '-')
102 return -simple_strtoul(cp + 1, endp, base);
103
104 return simple_strtoul(cp, endp, base);
105 }
106 EXPORT_SYMBOL(simple_strtol);
107
108 /**
109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
113 */
114 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
115 {
116 if (*cp == '-')
117 return -simple_strtoull(cp + 1, endp, base);
118
119 return simple_strtoull(cp, endp, base);
120 }
121 EXPORT_SYMBOL(simple_strtoll);
122
123 /**
124 * strict_strtoul - convert a string to an unsigned long strictly
125 * @cp: The string to be converted
126 * @base: The number base to use
127 * @res: The converted result value
128 *
129 * strict_strtoul converts a string to an unsigned long only if the
130 * string is really an unsigned long string, any string containing
131 * any invalid char at the tail will be rejected and -EINVAL is returned,
132 * only a newline char at the tail is acceptible because people generally
133 * change a module parameter in the following way:
134 *
135 * echo 1024 > /sys/module/e1000/parameters/copybreak
136 *
137 * echo will append a newline to the tail.
138 *
139 * It returns 0 if conversion is successful and *res is set to the converted
140 * value, otherwise it returns -EINVAL and *res is set to 0.
141 *
142 * simple_strtoul just ignores the successive invalid characters and
143 * return the converted value of prefix part of the string.
144 */
145 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
146 {
147 char *tail;
148 unsigned long val;
149
150 *res = 0;
151 if (!*cp)
152 return -EINVAL;
153
154 val = simple_strtoul(cp, &tail, base);
155 if (tail == cp)
156 return -EINVAL;
157
158 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
159 *res = val;
160 return 0;
161 }
162
163 return -EINVAL;
164 }
165 EXPORT_SYMBOL(strict_strtoul);
166
167 /**
168 * strict_strtol - convert a string to a long strictly
169 * @cp: The string to be converted
170 * @base: The number base to use
171 * @res: The converted result value
172 *
173 * strict_strtol is similiar to strict_strtoul, but it allows the first
174 * character of a string is '-'.
175 *
176 * It returns 0 if conversion is successful and *res is set to the converted
177 * value, otherwise it returns -EINVAL and *res is set to 0.
178 */
179 int strict_strtol(const char *cp, unsigned int base, long *res)
180 {
181 int ret;
182 if (*cp == '-') {
183 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
184 if (!ret)
185 *res = -(*res);
186 } else {
187 ret = strict_strtoul(cp, base, (unsigned long *)res);
188 }
189
190 return ret;
191 }
192 EXPORT_SYMBOL(strict_strtol);
193
194 /**
195 * strict_strtoull - convert a string to an unsigned long long strictly
196 * @cp: The string to be converted
197 * @base: The number base to use
198 * @res: The converted result value
199 *
200 * strict_strtoull converts a string to an unsigned long long only if the
201 * string is really an unsigned long long string, any string containing
202 * any invalid char at the tail will be rejected and -EINVAL is returned,
203 * only a newline char at the tail is acceptible because people generally
204 * change a module parameter in the following way:
205 *
206 * echo 1024 > /sys/module/e1000/parameters/copybreak
207 *
208 * echo will append a newline to the tail of the string.
209 *
210 * It returns 0 if conversion is successful and *res is set to the converted
211 * value, otherwise it returns -EINVAL and *res is set to 0.
212 *
213 * simple_strtoull just ignores the successive invalid characters and
214 * return the converted value of prefix part of the string.
215 */
216 int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
217 {
218 char *tail;
219 unsigned long long val;
220
221 *res = 0;
222 if (!*cp)
223 return -EINVAL;
224
225 val = simple_strtoull(cp, &tail, base);
226 if (tail == cp)
227 return -EINVAL;
228 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
229 *res = val;
230 return 0;
231 }
232
233 return -EINVAL;
234 }
235 EXPORT_SYMBOL(strict_strtoull);
236
237 /**
238 * strict_strtoll - convert a string to a long long strictly
239 * @cp: The string to be converted
240 * @base: The number base to use
241 * @res: The converted result value
242 *
243 * strict_strtoll is similiar to strict_strtoull, but it allows the first
244 * character of a string is '-'.
245 *
246 * It returns 0 if conversion is successful and *res is set to the converted
247 * value, otherwise it returns -EINVAL and *res is set to 0.
248 */
249 int strict_strtoll(const char *cp, unsigned int base, long long *res)
250 {
251 int ret;
252 if (*cp == '-') {
253 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
254 if (!ret)
255 *res = -(*res);
256 } else {
257 ret = strict_strtoull(cp, base, (unsigned long long *)res);
258 }
259
260 return ret;
261 }
262 EXPORT_SYMBOL(strict_strtoll);
263
264 static noinline_for_stack
265 int skip_atoi(const char **s)
266 {
267 int i = 0;
268
269 while (isdigit(**s))
270 i = i*10 + *((*s)++) - '0';
271
272 return i;
273 }
274
275 /* Decimal conversion is by far the most typical, and is used
276 * for /proc and /sys data. This directly impacts e.g. top performance
277 * with many processes running. We optimize it for speed
278 * using code from
279 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
280 * (with permission from the author, Douglas W. Jones). */
281
282 /* Formats correctly any integer in [0,99999].
283 * Outputs from one to five digits depending on input.
284 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
285 static noinline_for_stack
286 char *put_dec_trunc(char *buf, unsigned q)
287 {
288 unsigned d3, d2, d1, d0;
289 d1 = (q>>4) & 0xf;
290 d2 = (q>>8) & 0xf;
291 d3 = (q>>12);
292
293 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
294 q = (d0 * 0xcd) >> 11;
295 d0 = d0 - 10*q;
296 *buf++ = d0 + '0'; /* least significant digit */
297 d1 = q + 9*d3 + 5*d2 + d1;
298 if (d1 != 0) {
299 q = (d1 * 0xcd) >> 11;
300 d1 = d1 - 10*q;
301 *buf++ = d1 + '0'; /* next digit */
302
303 d2 = q + 2*d2;
304 if ((d2 != 0) || (d3 != 0)) {
305 q = (d2 * 0xd) >> 7;
306 d2 = d2 - 10*q;
307 *buf++ = d2 + '0'; /* next digit */
308
309 d3 = q + 4*d3;
310 if (d3 != 0) {
311 q = (d3 * 0xcd) >> 11;
312 d3 = d3 - 10*q;
313 *buf++ = d3 + '0'; /* next digit */
314 if (q != 0)
315 *buf++ = q + '0'; /* most sign. digit */
316 }
317 }
318 }
319
320 return buf;
321 }
322 /* Same with if's removed. Always emits five digits */
323 static noinline_for_stack
324 char *put_dec_full(char *buf, unsigned q)
325 {
326 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
327 /* but anyway, gcc produces better code with full-sized ints */
328 unsigned d3, d2, d1, d0;
329 d1 = (q>>4) & 0xf;
330 d2 = (q>>8) & 0xf;
331 d3 = (q>>12);
332
333 /*
334 * Possible ways to approx. divide by 10
335 * gcc -O2 replaces multiply with shifts and adds
336 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
337 * (x * 0x67) >> 10: 1100111
338 * (x * 0x34) >> 9: 110100 - same
339 * (x * 0x1a) >> 8: 11010 - same
340 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
341 */
342 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
343 q = (d0 * 0xcd) >> 11;
344 d0 = d0 - 10*q;
345 *buf++ = d0 + '0';
346 d1 = q + 9*d3 + 5*d2 + d1;
347 q = (d1 * 0xcd) >> 11;
348 d1 = d1 - 10*q;
349 *buf++ = d1 + '0';
350
351 d2 = q + 2*d2;
352 q = (d2 * 0xd) >> 7;
353 d2 = d2 - 10*q;
354 *buf++ = d2 + '0';
355
356 d3 = q + 4*d3;
357 q = (d3 * 0xcd) >> 11; /* - shorter code */
358 /* q = (d3 * 0x67) >> 10; - would also work */
359 d3 = d3 - 10*q;
360 *buf++ = d3 + '0';
361 *buf++ = q + '0';
362
363 return buf;
364 }
365 /* No inlining helps gcc to use registers better */
366 static noinline_for_stack
367 char *put_dec(char *buf, unsigned long long num)
368 {
369 while (1) {
370 unsigned rem;
371 if (num < 100000)
372 return put_dec_trunc(buf, num);
373 rem = do_div(num, 100000);
374 buf = put_dec_full(buf, rem);
375 }
376 }
377
378 #define ZEROPAD 1 /* pad with zero */
379 #define SIGN 2 /* unsigned/signed long */
380 #define PLUS 4 /* show plus */
381 #define SPACE 8 /* space if plus */
382 #define LEFT 16 /* left justified */
383 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
384 #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
385
386 enum format_type {
387 FORMAT_TYPE_NONE, /* Just a string part */
388 FORMAT_TYPE_WIDTH,
389 FORMAT_TYPE_PRECISION,
390 FORMAT_TYPE_CHAR,
391 FORMAT_TYPE_STR,
392 FORMAT_TYPE_PTR,
393 FORMAT_TYPE_PERCENT_CHAR,
394 FORMAT_TYPE_INVALID,
395 FORMAT_TYPE_LONG_LONG,
396 FORMAT_TYPE_ULONG,
397 FORMAT_TYPE_LONG,
398 FORMAT_TYPE_UBYTE,
399 FORMAT_TYPE_BYTE,
400 FORMAT_TYPE_USHORT,
401 FORMAT_TYPE_SHORT,
402 FORMAT_TYPE_UINT,
403 FORMAT_TYPE_INT,
404 FORMAT_TYPE_NRCHARS,
405 FORMAT_TYPE_SIZE_T,
406 FORMAT_TYPE_PTRDIFF
407 };
408
409 struct printf_spec {
410 u8 type; /* format_type enum */
411 u8 flags; /* flags to number() */
412 u8 base; /* number base, 8, 10 or 16 only */
413 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
414 s16 field_width; /* width of output field */
415 s16 precision; /* # of digits/chars */
416 };
417
418 static noinline_for_stack
419 char *number(char *buf, char *end, unsigned long long num,
420 struct printf_spec spec)
421 {
422 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
423 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
424
425 char tmp[66];
426 char sign;
427 char locase;
428 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
429 int i;
430
431 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
432 * produces same digits or (maybe lowercased) letters */
433 locase = (spec.flags & SMALL);
434 if (spec.flags & LEFT)
435 spec.flags &= ~ZEROPAD;
436 sign = 0;
437 if (spec.flags & SIGN) {
438 if ((signed long long)num < 0) {
439 sign = '-';
440 num = -(signed long long)num;
441 spec.field_width--;
442 } else if (spec.flags & PLUS) {
443 sign = '+';
444 spec.field_width--;
445 } else if (spec.flags & SPACE) {
446 sign = ' ';
447 spec.field_width--;
448 }
449 }
450 if (need_pfx) {
451 spec.field_width--;
452 if (spec.base == 16)
453 spec.field_width--;
454 }
455
456 /* generate full string in tmp[], in reverse order */
457 i = 0;
458 if (num == 0)
459 tmp[i++] = '0';
460 /* Generic code, for any base:
461 else do {
462 tmp[i++] = (digits[do_div(num,base)] | locase);
463 } while (num != 0);
464 */
465 else if (spec.base != 10) { /* 8 or 16 */
466 int mask = spec.base - 1;
467 int shift = 3;
468
469 if (spec.base == 16)
470 shift = 4;
471 do {
472 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
473 num >>= shift;
474 } while (num);
475 } else { /* base 10 */
476 i = put_dec(tmp, num) - tmp;
477 }
478
479 /* printing 100 using %2d gives "100", not "00" */
480 if (i > spec.precision)
481 spec.precision = i;
482 /* leading space padding */
483 spec.field_width -= spec.precision;
484 if (!(spec.flags & (ZEROPAD+LEFT))) {
485 while (--spec.field_width >= 0) {
486 if (buf < end)
487 *buf = ' ';
488 ++buf;
489 }
490 }
491 /* sign */
492 if (sign) {
493 if (buf < end)
494 *buf = sign;
495 ++buf;
496 }
497 /* "0x" / "0" prefix */
498 if (need_pfx) {
499 if (buf < end)
500 *buf = '0';
501 ++buf;
502 if (spec.base == 16) {
503 if (buf < end)
504 *buf = ('X' | locase);
505 ++buf;
506 }
507 }
508 /* zero or space padding */
509 if (!(spec.flags & LEFT)) {
510 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
511 while (--spec.field_width >= 0) {
512 if (buf < end)
513 *buf = c;
514 ++buf;
515 }
516 }
517 /* hmm even more zero padding? */
518 while (i <= --spec.precision) {
519 if (buf < end)
520 *buf = '0';
521 ++buf;
522 }
523 /* actual digits of result */
524 while (--i >= 0) {
525 if (buf < end)
526 *buf = tmp[i];
527 ++buf;
528 }
529 /* trailing space padding */
530 while (--spec.field_width >= 0) {
531 if (buf < end)
532 *buf = ' ';
533 ++buf;
534 }
535
536 return buf;
537 }
538
539 static noinline_for_stack
540 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
541 {
542 int len, i;
543
544 if ((unsigned long)s < PAGE_SIZE)
545 s = "(null)";
546
547 len = strnlen(s, spec.precision);
548
549 if (!(spec.flags & LEFT)) {
550 while (len < spec.field_width--) {
551 if (buf < end)
552 *buf = ' ';
553 ++buf;
554 }
555 }
556 for (i = 0; i < len; ++i) {
557 if (buf < end)
558 *buf = *s;
559 ++buf; ++s;
560 }
561 while (len < spec.field_width--) {
562 if (buf < end)
563 *buf = ' ';
564 ++buf;
565 }
566
567 return buf;
568 }
569
570 static noinline_for_stack
571 char *symbol_string(char *buf, char *end, void *ptr,
572 struct printf_spec spec, char ext)
573 {
574 unsigned long value = (unsigned long) ptr;
575 #ifdef CONFIG_KALLSYMS
576 char sym[KSYM_SYMBOL_LEN];
577 if (ext != 'f' && ext != 's')
578 sprint_symbol(sym, value);
579 else
580 kallsyms_lookup(value, NULL, NULL, NULL, sym);
581
582 return string(buf, end, sym, spec);
583 #else
584 spec.field_width = 2 * sizeof(void *);
585 spec.flags |= SPECIAL | SMALL | ZEROPAD;
586 spec.base = 16;
587
588 return number(buf, end, value, spec);
589 #endif
590 }
591
592 static noinline_for_stack
593 char *resource_string(char *buf, char *end, struct resource *res,
594 struct printf_spec spec, const char *fmt)
595 {
596 #ifndef IO_RSRC_PRINTK_SIZE
597 #define IO_RSRC_PRINTK_SIZE 6
598 #endif
599
600 #ifndef MEM_RSRC_PRINTK_SIZE
601 #define MEM_RSRC_PRINTK_SIZE 10
602 #endif
603 static const struct printf_spec io_spec = {
604 .base = 16,
605 .field_width = IO_RSRC_PRINTK_SIZE,
606 .precision = -1,
607 .flags = SPECIAL | SMALL | ZEROPAD,
608 };
609 static const struct printf_spec mem_spec = {
610 .base = 16,
611 .field_width = MEM_RSRC_PRINTK_SIZE,
612 .precision = -1,
613 .flags = SPECIAL | SMALL | ZEROPAD,
614 };
615 static const struct printf_spec bus_spec = {
616 .base = 16,
617 .field_width = 2,
618 .precision = -1,
619 .flags = SMALL | ZEROPAD,
620 };
621 static const struct printf_spec dec_spec = {
622 .base = 10,
623 .precision = -1,
624 .flags = 0,
625 };
626 static const struct printf_spec str_spec = {
627 .field_width = -1,
628 .precision = 10,
629 .flags = LEFT,
630 };
631 static const struct printf_spec flag_spec = {
632 .base = 16,
633 .precision = -1,
634 .flags = SPECIAL | SMALL,
635 };
636
637 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
638 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
639 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
640 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
641 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
642 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
643 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
644 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
645
646 char *p = sym, *pend = sym + sizeof(sym);
647 int decode = (fmt[0] == 'R') ? 1 : 0;
648 const struct printf_spec *specp;
649
650 *p++ = '[';
651 if (res->flags & IORESOURCE_IO) {
652 p = string(p, pend, "io ", str_spec);
653 specp = &io_spec;
654 } else if (res->flags & IORESOURCE_MEM) {
655 p = string(p, pend, "mem ", str_spec);
656 specp = &mem_spec;
657 } else if (res->flags & IORESOURCE_IRQ) {
658 p = string(p, pend, "irq ", str_spec);
659 specp = &dec_spec;
660 } else if (res->flags & IORESOURCE_DMA) {
661 p = string(p, pend, "dma ", str_spec);
662 specp = &dec_spec;
663 } else if (res->flags & IORESOURCE_BUS) {
664 p = string(p, pend, "bus ", str_spec);
665 specp = &bus_spec;
666 } else {
667 p = string(p, pend, "??? ", str_spec);
668 specp = &mem_spec;
669 decode = 0;
670 }
671 p = number(p, pend, res->start, *specp);
672 if (res->start != res->end) {
673 *p++ = '-';
674 p = number(p, pend, res->end, *specp);
675 }
676 if (decode) {
677 if (res->flags & IORESOURCE_MEM_64)
678 p = string(p, pend, " 64bit", str_spec);
679 if (res->flags & IORESOURCE_PREFETCH)
680 p = string(p, pend, " pref", str_spec);
681 if (res->flags & IORESOURCE_WINDOW)
682 p = string(p, pend, " window", str_spec);
683 if (res->flags & IORESOURCE_DISABLED)
684 p = string(p, pend, " disabled", str_spec);
685 } else {
686 p = string(p, pend, " flags ", str_spec);
687 p = number(p, pend, res->flags, flag_spec);
688 }
689 *p++ = ']';
690 *p = '\0';
691
692 return string(buf, end, sym, spec);
693 }
694
695 static noinline_for_stack
696 char *mac_address_string(char *buf, char *end, u8 *addr,
697 struct printf_spec spec, const char *fmt)
698 {
699 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
700 char *p = mac_addr;
701 int i;
702 char separator;
703
704 if (fmt[1] == 'F') { /* FDDI canonical format */
705 separator = '-';
706 } else {
707 separator = ':';
708 }
709
710 for (i = 0; i < 6; i++) {
711 p = pack_hex_byte(p, addr[i]);
712 if (fmt[0] == 'M' && i != 5)
713 *p++ = separator;
714 }
715 *p = '\0';
716
717 return string(buf, end, mac_addr, spec);
718 }
719
720 static noinline_for_stack
721 char *ip4_string(char *p, const u8 *addr, const char *fmt)
722 {
723 int i;
724 bool leading_zeros = (fmt[0] == 'i');
725 int index;
726 int step;
727
728 switch (fmt[2]) {
729 case 'h':
730 #ifdef __BIG_ENDIAN
731 index = 0;
732 step = 1;
733 #else
734 index = 3;
735 step = -1;
736 #endif
737 break;
738 case 'l':
739 index = 3;
740 step = -1;
741 break;
742 case 'n':
743 case 'b':
744 default:
745 index = 0;
746 step = 1;
747 break;
748 }
749 for (i = 0; i < 4; i++) {
750 char temp[3]; /* hold each IP quad in reverse order */
751 int digits = put_dec_trunc(temp, addr[index]) - temp;
752 if (leading_zeros) {
753 if (digits < 3)
754 *p++ = '0';
755 if (digits < 2)
756 *p++ = '0';
757 }
758 /* reverse the digits in the quad */
759 while (digits--)
760 *p++ = temp[digits];
761 if (i < 3)
762 *p++ = '.';
763 index += step;
764 }
765 *p = '\0';
766
767 return p;
768 }
769
770 static noinline_for_stack
771 char *ip6_compressed_string(char *p, const char *addr)
772 {
773 int i, j, range;
774 unsigned char zerolength[8];
775 int longest = 1;
776 int colonpos = -1;
777 u16 word;
778 u8 hi, lo;
779 bool needcolon = false;
780 bool useIPv4;
781 struct in6_addr in6;
782
783 memcpy(&in6, addr, sizeof(struct in6_addr));
784
785 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
786
787 memset(zerolength, 0, sizeof(zerolength));
788
789 if (useIPv4)
790 range = 6;
791 else
792 range = 8;
793
794 /* find position of longest 0 run */
795 for (i = 0; i < range; i++) {
796 for (j = i; j < range; j++) {
797 if (in6.s6_addr16[j] != 0)
798 break;
799 zerolength[i]++;
800 }
801 }
802 for (i = 0; i < range; i++) {
803 if (zerolength[i] > longest) {
804 longest = zerolength[i];
805 colonpos = i;
806 }
807 }
808
809 /* emit address */
810 for (i = 0; i < range; i++) {
811 if (i == colonpos) {
812 if (needcolon || i == 0)
813 *p++ = ':';
814 *p++ = ':';
815 needcolon = false;
816 i += longest - 1;
817 continue;
818 }
819 if (needcolon) {
820 *p++ = ':';
821 needcolon = false;
822 }
823 /* hex u16 without leading 0s */
824 word = ntohs(in6.s6_addr16[i]);
825 hi = word >> 8;
826 lo = word & 0xff;
827 if (hi) {
828 if (hi > 0x0f)
829 p = pack_hex_byte(p, hi);
830 else
831 *p++ = hex_asc_lo(hi);
832 p = pack_hex_byte(p, lo);
833 }
834 else if (lo > 0x0f)
835 p = pack_hex_byte(p, lo);
836 else
837 *p++ = hex_asc_lo(lo);
838 needcolon = true;
839 }
840
841 if (useIPv4) {
842 if (needcolon)
843 *p++ = ':';
844 p = ip4_string(p, &in6.s6_addr[12], "I4");
845 }
846 *p = '\0';
847
848 return p;
849 }
850
851 static noinline_for_stack
852 char *ip6_string(char *p, const char *addr, const char *fmt)
853 {
854 int i;
855
856 for (i = 0; i < 8; i++) {
857 p = pack_hex_byte(p, *addr++);
858 p = pack_hex_byte(p, *addr++);
859 if (fmt[0] == 'I' && i != 7)
860 *p++ = ':';
861 }
862 *p = '\0';
863
864 return p;
865 }
866
867 static noinline_for_stack
868 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
869 struct printf_spec spec, const char *fmt)
870 {
871 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
872
873 if (fmt[0] == 'I' && fmt[2] == 'c')
874 ip6_compressed_string(ip6_addr, addr);
875 else
876 ip6_string(ip6_addr, addr, fmt);
877
878 return string(buf, end, ip6_addr, spec);
879 }
880
881 static noinline_for_stack
882 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
883 struct printf_spec spec, const char *fmt)
884 {
885 char ip4_addr[sizeof("255.255.255.255")];
886
887 ip4_string(ip4_addr, addr, fmt);
888
889 return string(buf, end, ip4_addr, spec);
890 }
891
892 static noinline_for_stack
893 char *uuid_string(char *buf, char *end, const u8 *addr,
894 struct printf_spec spec, const char *fmt)
895 {
896 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
897 char *p = uuid;
898 int i;
899 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
900 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
901 const u8 *index = be;
902 bool uc = false;
903
904 switch (*(++fmt)) {
905 case 'L':
906 uc = true; /* fall-through */
907 case 'l':
908 index = le;
909 break;
910 case 'B':
911 uc = true;
912 break;
913 }
914
915 for (i = 0; i < 16; i++) {
916 p = pack_hex_byte(p, addr[index[i]]);
917 switch (i) {
918 case 3:
919 case 5:
920 case 7:
921 case 9:
922 *p++ = '-';
923 break;
924 }
925 }
926
927 *p = 0;
928
929 if (uc) {
930 p = uuid;
931 do {
932 *p = toupper(*p);
933 } while (*(++p));
934 }
935
936 return string(buf, end, uuid, spec);
937 }
938
939 static noinline_for_stack
940 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
941 struct printf_spec spec)
942 {
943 if (!ptr)
944 return string(buf, end, "(null)", spec);
945
946 switch (*fmt) {
947 case 'F':
948 case 'f':
949 ptr = dereference_function_descriptor(ptr);
950 /* Fallthrough */
951 case 'S':
952 case 's':
953 return symbol_string(buf, end, ptr, spec, *fmt);
954 case 'R':
955 case 'r':
956 return resource_string(buf, end, ptr, spec, fmt);
957 case 'M': /* Colon separated: 00:01:02:03:04:05 */
958 case 'm': /* Contiguous: 000102030405 */
959 /* [mM]F (FDDI, bit reversed) */
960 return mac_address_string(buf, end, ptr, spec, fmt);
961 case 'I': /* Formatted IP supported
962 * 4: 1.2.3.4
963 * 6: 0001:0203:...:0708
964 * 6c: 1::708 or 1::1.2.3.4
965 */
966 case 'i': /* Contiguous:
967 * 4: 001.002.003.004
968 * 6: 000102...0f
969 */
970 switch (fmt[1]) {
971 case '6':
972 return ip6_addr_string(buf, end, ptr, spec, fmt);
973 case '4':
974 return ip4_addr_string(buf, end, ptr, spec, fmt);
975 }
976 break;
977 case 'U':
978 return uuid_string(buf, end, ptr, spec, fmt);
979 case 'V':
980 return buf + vsnprintf(buf, end - buf,
981 ((struct va_format *)ptr)->fmt,
982 *(((struct va_format *)ptr)->va));
983 }
984 spec.flags |= SMALL;
985 if (spec.field_width == -1) {
986 spec.field_width = 2*sizeof(void *);
987 spec.flags |= ZEROPAD;
988 }
989 spec.base = 16;
990
991 return number(buf, end, (unsigned long) ptr, spec);
992 }
993
994 /*
995 * Helper function to decode printf style format.
996 * Each call decode a token from the format and return the
997 * number of characters read (or likely the delta where it wants
998 * to go on the next call).
999 * The decoded token is returned through the parameters
1000 *
1001 * 'h', 'l', or 'L' for integer fields
1002 * 'z' support added 23/7/1999 S.H.
1003 * 'z' changed to 'Z' --davidm 1/25/99
1004 * 't' added for ptrdiff_t
1005 *
1006 * @fmt: the format string
1007 * @type of the token returned
1008 * @flags: various flags such as +, -, # tokens..
1009 * @field_width: overwritten width
1010 * @base: base of the number (octal, hex, ...)
1011 * @precision: precision of a number
1012 * @qualifier: qualifier of a number (long, size_t, ...)
1013 */
1014 static noinline_for_stack
1015 int format_decode(const char *fmt, struct printf_spec *spec)
1016 {
1017 const char *start = fmt;
1018
1019 /* we finished early by reading the field width */
1020 if (spec->type == FORMAT_TYPE_WIDTH) {
1021 if (spec->field_width < 0) {
1022 spec->field_width = -spec->field_width;
1023 spec->flags |= LEFT;
1024 }
1025 spec->type = FORMAT_TYPE_NONE;
1026 goto precision;
1027 }
1028
1029 /* we finished early by reading the precision */
1030 if (spec->type == FORMAT_TYPE_PRECISION) {
1031 if (spec->precision < 0)
1032 spec->precision = 0;
1033
1034 spec->type = FORMAT_TYPE_NONE;
1035 goto qualifier;
1036 }
1037
1038 /* By default */
1039 spec->type = FORMAT_TYPE_NONE;
1040
1041 for (; *fmt ; ++fmt) {
1042 if (*fmt == '%')
1043 break;
1044 }
1045
1046 /* Return the current non-format string */
1047 if (fmt != start || !*fmt)
1048 return fmt - start;
1049
1050 /* Process flags */
1051 spec->flags = 0;
1052
1053 while (1) { /* this also skips first '%' */
1054 bool found = true;
1055
1056 ++fmt;
1057
1058 switch (*fmt) {
1059 case '-': spec->flags |= LEFT; break;
1060 case '+': spec->flags |= PLUS; break;
1061 case ' ': spec->flags |= SPACE; break;
1062 case '#': spec->flags |= SPECIAL; break;
1063 case '0': spec->flags |= ZEROPAD; break;
1064 default: found = false;
1065 }
1066
1067 if (!found)
1068 break;
1069 }
1070
1071 /* get field width */
1072 spec->field_width = -1;
1073
1074 if (isdigit(*fmt))
1075 spec->field_width = skip_atoi(&fmt);
1076 else if (*fmt == '*') {
1077 /* it's the next argument */
1078 spec->type = FORMAT_TYPE_WIDTH;
1079 return ++fmt - start;
1080 }
1081
1082 precision:
1083 /* get the precision */
1084 spec->precision = -1;
1085 if (*fmt == '.') {
1086 ++fmt;
1087 if (isdigit(*fmt)) {
1088 spec->precision = skip_atoi(&fmt);
1089 if (spec->precision < 0)
1090 spec->precision = 0;
1091 } else if (*fmt == '*') {
1092 /* it's the next argument */
1093 spec->type = FORMAT_TYPE_PRECISION;
1094 return ++fmt - start;
1095 }
1096 }
1097
1098 qualifier:
1099 /* get the conversion qualifier */
1100 spec->qualifier = -1;
1101 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1102 TOLOWER(*fmt) == 'z' || *fmt == 't') {
1103 spec->qualifier = *fmt++;
1104 if (unlikely(spec->qualifier == *fmt)) {
1105 if (spec->qualifier == 'l') {
1106 spec->qualifier = 'L';
1107 ++fmt;
1108 } else if (spec->qualifier == 'h') {
1109 spec->qualifier = 'H';
1110 ++fmt;
1111 }
1112 }
1113 }
1114
1115 /* default base */
1116 spec->base = 10;
1117 switch (*fmt) {
1118 case 'c':
1119 spec->type = FORMAT_TYPE_CHAR;
1120 return ++fmt - start;
1121
1122 case 's':
1123 spec->type = FORMAT_TYPE_STR;
1124 return ++fmt - start;
1125
1126 case 'p':
1127 spec->type = FORMAT_TYPE_PTR;
1128 return fmt - start;
1129 /* skip alnum */
1130
1131 case 'n':
1132 spec->type = FORMAT_TYPE_NRCHARS;
1133 return ++fmt - start;
1134
1135 case '%':
1136 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1137 return ++fmt - start;
1138
1139 /* integer number formats - set up the flags and "break" */
1140 case 'o':
1141 spec->base = 8;
1142 break;
1143
1144 case 'x':
1145 spec->flags |= SMALL;
1146
1147 case 'X':
1148 spec->base = 16;
1149 break;
1150
1151 case 'd':
1152 case 'i':
1153 spec->flags |= SIGN;
1154 case 'u':
1155 break;
1156
1157 default:
1158 spec->type = FORMAT_TYPE_INVALID;
1159 return fmt - start;
1160 }
1161
1162 if (spec->qualifier == 'L')
1163 spec->type = FORMAT_TYPE_LONG_LONG;
1164 else if (spec->qualifier == 'l') {
1165 if (spec->flags & SIGN)
1166 spec->type = FORMAT_TYPE_LONG;
1167 else
1168 spec->type = FORMAT_TYPE_ULONG;
1169 } else if (TOLOWER(spec->qualifier) == 'z') {
1170 spec->type = FORMAT_TYPE_SIZE_T;
1171 } else if (spec->qualifier == 't') {
1172 spec->type = FORMAT_TYPE_PTRDIFF;
1173 } else if (spec->qualifier == 'H') {
1174 if (spec->flags & SIGN)
1175 spec->type = FORMAT_TYPE_BYTE;
1176 else
1177 spec->type = FORMAT_TYPE_UBYTE;
1178 } else if (spec->qualifier == 'h') {
1179 if (spec->flags & SIGN)
1180 spec->type = FORMAT_TYPE_SHORT;
1181 else
1182 spec->type = FORMAT_TYPE_USHORT;
1183 } else {
1184 if (spec->flags & SIGN)
1185 spec->type = FORMAT_TYPE_INT;
1186 else
1187 spec->type = FORMAT_TYPE_UINT;
1188 }
1189
1190 return ++fmt - start;
1191 }
1192
1193 /**
1194 * vsnprintf - Format a string and place it in a buffer
1195 * @buf: The buffer to place the result into
1196 * @size: The size of the buffer, including the trailing null space
1197 * @fmt: The format string to use
1198 * @args: Arguments for the format string
1199 *
1200 * This function follows C99 vsnprintf, but has some extensions:
1201 * %pS output the name of a text symbol with offset
1202 * %ps output the name of a text symbol without offset
1203 * %pF output the name of a function pointer with its offset
1204 * %pf output the name of a function pointer without its offset
1205 * %pR output the address range in a struct resource with decoded flags
1206 * %pr output the address range in a struct resource with raw flags
1207 * %pM output a 6-byte MAC address with colons
1208 * %pm output a 6-byte MAC address without colons
1209 * %pI4 print an IPv4 address without leading zeros
1210 * %pi4 print an IPv4 address with leading zeros
1211 * %pI6 print an IPv6 address with colons
1212 * %pi6 print an IPv6 address without colons
1213 * %pI6c print an IPv6 address as specified by
1214 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
1215 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1216 * case.
1217 * %n is ignored
1218 *
1219 * The return value is the number of characters which would
1220 * be generated for the given input, excluding the trailing
1221 * '\0', as per ISO C99. If you want to have the exact
1222 * number of characters written into @buf as return value
1223 * (not including the trailing '\0'), use vscnprintf(). If the
1224 * return is greater than or equal to @size, the resulting
1225 * string is truncated.
1226 *
1227 * Call this function if you are already dealing with a va_list.
1228 * You probably want snprintf() instead.
1229 */
1230 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1231 {
1232 unsigned long long num;
1233 char *str, *end;
1234 struct printf_spec spec = {0};
1235
1236 /* Reject out-of-range values early. Large positive sizes are
1237 used for unknown buffer sizes. */
1238 if (WARN_ON_ONCE((int) size < 0))
1239 return 0;
1240
1241 str = buf;
1242 end = buf + size;
1243
1244 /* Make sure end is always >= buf */
1245 if (end < buf) {
1246 end = ((void *)-1);
1247 size = end - buf;
1248 }
1249
1250 while (*fmt) {
1251 const char *old_fmt = fmt;
1252 int read = format_decode(fmt, &spec);
1253
1254 fmt += read;
1255
1256 switch (spec.type) {
1257 case FORMAT_TYPE_NONE: {
1258 int copy = read;
1259 if (str < end) {
1260 if (copy > end - str)
1261 copy = end - str;
1262 memcpy(str, old_fmt, copy);
1263 }
1264 str += read;
1265 break;
1266 }
1267
1268 case FORMAT_TYPE_WIDTH:
1269 spec.field_width = va_arg(args, int);
1270 break;
1271
1272 case FORMAT_TYPE_PRECISION:
1273 spec.precision = va_arg(args, int);
1274 break;
1275
1276 case FORMAT_TYPE_CHAR: {
1277 char c;
1278
1279 if (!(spec.flags & LEFT)) {
1280 while (--spec.field_width > 0) {
1281 if (str < end)
1282 *str = ' ';
1283 ++str;
1284
1285 }
1286 }
1287 c = (unsigned char) va_arg(args, int);
1288 if (str < end)
1289 *str = c;
1290 ++str;
1291 while (--spec.field_width > 0) {
1292 if (str < end)
1293 *str = ' ';
1294 ++str;
1295 }
1296 break;
1297 }
1298
1299 case FORMAT_TYPE_STR:
1300 str = string(str, end, va_arg(args, char *), spec);
1301 break;
1302
1303 case FORMAT_TYPE_PTR:
1304 str = pointer(fmt+1, str, end, va_arg(args, void *),
1305 spec);
1306 while (isalnum(*fmt))
1307 fmt++;
1308 break;
1309
1310 case FORMAT_TYPE_PERCENT_CHAR:
1311 if (str < end)
1312 *str = '%';
1313 ++str;
1314 break;
1315
1316 case FORMAT_TYPE_INVALID:
1317 if (str < end)
1318 *str = '%';
1319 ++str;
1320 break;
1321
1322 case FORMAT_TYPE_NRCHARS: {
1323 u8 qualifier = spec.qualifier;
1324
1325 if (qualifier == 'l') {
1326 long *ip = va_arg(args, long *);
1327 *ip = (str - buf);
1328 } else if (TOLOWER(qualifier) == 'z') {
1329 size_t *ip = va_arg(args, size_t *);
1330 *ip = (str - buf);
1331 } else {
1332 int *ip = va_arg(args, int *);
1333 *ip = (str - buf);
1334 }
1335 break;
1336 }
1337
1338 default:
1339 switch (spec.type) {
1340 case FORMAT_TYPE_LONG_LONG:
1341 num = va_arg(args, long long);
1342 break;
1343 case FORMAT_TYPE_ULONG:
1344 num = va_arg(args, unsigned long);
1345 break;
1346 case FORMAT_TYPE_LONG:
1347 num = va_arg(args, long);
1348 break;
1349 case FORMAT_TYPE_SIZE_T:
1350 num = va_arg(args, size_t);
1351 break;
1352 case FORMAT_TYPE_PTRDIFF:
1353 num = va_arg(args, ptrdiff_t);
1354 break;
1355 case FORMAT_TYPE_UBYTE:
1356 num = (unsigned char) va_arg(args, int);
1357 break;
1358 case FORMAT_TYPE_BYTE:
1359 num = (signed char) va_arg(args, int);
1360 break;
1361 case FORMAT_TYPE_USHORT:
1362 num = (unsigned short) va_arg(args, int);
1363 break;
1364 case FORMAT_TYPE_SHORT:
1365 num = (short) va_arg(args, int);
1366 break;
1367 case FORMAT_TYPE_INT:
1368 num = (int) va_arg(args, int);
1369 break;
1370 default:
1371 num = va_arg(args, unsigned int);
1372 }
1373
1374 str = number(str, end, num, spec);
1375 }
1376 }
1377
1378 if (size > 0) {
1379 if (str < end)
1380 *str = '\0';
1381 else
1382 end[-1] = '\0';
1383 }
1384
1385 /* the trailing null byte doesn't count towards the total */
1386 return str-buf;
1387
1388 }
1389 EXPORT_SYMBOL(vsnprintf);
1390
1391 /**
1392 * vscnprintf - Format a string and place it in a buffer
1393 * @buf: The buffer to place the result into
1394 * @size: The size of the buffer, including the trailing null space
1395 * @fmt: The format string to use
1396 * @args: Arguments for the format string
1397 *
1398 * The return value is the number of characters which have been written into
1399 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1400 * returns 0.
1401 *
1402 * Call this function if you are already dealing with a va_list.
1403 * You probably want scnprintf() instead.
1404 *
1405 * See the vsnprintf() documentation for format string extensions over C99.
1406 */
1407 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1408 {
1409 int i;
1410
1411 i = vsnprintf(buf, size, fmt, args);
1412
1413 return (i >= size) ? (size - 1) : i;
1414 }
1415 EXPORT_SYMBOL(vscnprintf);
1416
1417 /**
1418 * snprintf - Format a string and place it in a buffer
1419 * @buf: The buffer to place the result into
1420 * @size: The size of the buffer, including the trailing null space
1421 * @fmt: The format string to use
1422 * @...: Arguments for the format string
1423 *
1424 * The return value is the number of characters which would be
1425 * generated for the given input, excluding the trailing null,
1426 * as per ISO C99. If the return is greater than or equal to
1427 * @size, the resulting string is truncated.
1428 *
1429 * See the vsnprintf() documentation for format string extensions over C99.
1430 */
1431 int snprintf(char *buf, size_t size, const char *fmt, ...)
1432 {
1433 va_list args;
1434 int i;
1435
1436 va_start(args, fmt);
1437 i = vsnprintf(buf, size, fmt, args);
1438 va_end(args);
1439
1440 return i;
1441 }
1442 EXPORT_SYMBOL(snprintf);
1443
1444 /**
1445 * scnprintf - Format a string and place it in a buffer
1446 * @buf: The buffer to place the result into
1447 * @size: The size of the buffer, including the trailing null space
1448 * @fmt: The format string to use
1449 * @...: Arguments for the format string
1450 *
1451 * The return value is the number of characters written into @buf not including
1452 * the trailing '\0'. If @size is <= 0 the function returns 0.
1453 */
1454
1455 int scnprintf(char *buf, size_t size, const char *fmt, ...)
1456 {
1457 va_list args;
1458 int i;
1459
1460 va_start(args, fmt);
1461 i = vsnprintf(buf, size, fmt, args);
1462 va_end(args);
1463
1464 return (i >= size) ? (size - 1) : i;
1465 }
1466 EXPORT_SYMBOL(scnprintf);
1467
1468 /**
1469 * vsprintf - Format a string and place it in a buffer
1470 * @buf: The buffer to place the result into
1471 * @fmt: The format string to use
1472 * @args: Arguments for the format string
1473 *
1474 * The function returns the number of characters written
1475 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
1476 * buffer overflows.
1477 *
1478 * Call this function if you are already dealing with a va_list.
1479 * You probably want sprintf() instead.
1480 *
1481 * See the vsnprintf() documentation for format string extensions over C99.
1482 */
1483 int vsprintf(char *buf, const char *fmt, va_list args)
1484 {
1485 return vsnprintf(buf, INT_MAX, fmt, args);
1486 }
1487 EXPORT_SYMBOL(vsprintf);
1488
1489 /**
1490 * sprintf - Format a string and place it in a buffer
1491 * @buf: The buffer to place the result into
1492 * @fmt: The format string to use
1493 * @...: Arguments for the format string
1494 *
1495 * The function returns the number of characters written
1496 * into @buf. Use snprintf() or scnprintf() in order to avoid
1497 * buffer overflows.
1498 *
1499 * See the vsnprintf() documentation for format string extensions over C99.
1500 */
1501 int sprintf(char *buf, const char *fmt, ...)
1502 {
1503 va_list args;
1504 int i;
1505
1506 va_start(args, fmt);
1507 i = vsnprintf(buf, INT_MAX, fmt, args);
1508 va_end(args);
1509
1510 return i;
1511 }
1512 EXPORT_SYMBOL(sprintf);
1513
1514 #ifdef CONFIG_BINARY_PRINTF
1515 /*
1516 * bprintf service:
1517 * vbin_printf() - VA arguments to binary data
1518 * bstr_printf() - Binary data to text string
1519 */
1520
1521 /**
1522 * vbin_printf - Parse a format string and place args' binary value in a buffer
1523 * @bin_buf: The buffer to place args' binary value
1524 * @size: The size of the buffer(by words(32bits), not characters)
1525 * @fmt: The format string to use
1526 * @args: Arguments for the format string
1527 *
1528 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1529 * is skiped.
1530 *
1531 * The return value is the number of words(32bits) which would be generated for
1532 * the given input.
1533 *
1534 * NOTE:
1535 * If the return value is greater than @size, the resulting bin_buf is NOT
1536 * valid for bstr_printf().
1537 */
1538 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1539 {
1540 struct printf_spec spec = {0};
1541 char *str, *end;
1542
1543 str = (char *)bin_buf;
1544 end = (char *)(bin_buf + size);
1545
1546 #define save_arg(type) \
1547 do { \
1548 if (sizeof(type) == 8) { \
1549 unsigned long long value; \
1550 str = PTR_ALIGN(str, sizeof(u32)); \
1551 value = va_arg(args, unsigned long long); \
1552 if (str + sizeof(type) <= end) { \
1553 *(u32 *)str = *(u32 *)&value; \
1554 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1555 } \
1556 } else { \
1557 unsigned long value; \
1558 str = PTR_ALIGN(str, sizeof(type)); \
1559 value = va_arg(args, int); \
1560 if (str + sizeof(type) <= end) \
1561 *(typeof(type) *)str = (type)value; \
1562 } \
1563 str += sizeof(type); \
1564 } while (0)
1565
1566 while (*fmt) {
1567 int read = format_decode(fmt, &spec);
1568
1569 fmt += read;
1570
1571 switch (spec.type) {
1572 case FORMAT_TYPE_NONE:
1573 case FORMAT_TYPE_INVALID:
1574 case FORMAT_TYPE_PERCENT_CHAR:
1575 break;
1576
1577 case FORMAT_TYPE_WIDTH:
1578 case FORMAT_TYPE_PRECISION:
1579 save_arg(int);
1580 break;
1581
1582 case FORMAT_TYPE_CHAR:
1583 save_arg(char);
1584 break;
1585
1586 case FORMAT_TYPE_STR: {
1587 const char *save_str = va_arg(args, char *);
1588 size_t len;
1589
1590 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1591 || (unsigned long)save_str < PAGE_SIZE)
1592 save_str = "(null)";
1593 len = strlen(save_str) + 1;
1594 if (str + len < end)
1595 memcpy(str, save_str, len);
1596 str += len;
1597 break;
1598 }
1599
1600 case FORMAT_TYPE_PTR:
1601 save_arg(void *);
1602 /* skip all alphanumeric pointer suffixes */
1603 while (isalnum(*fmt))
1604 fmt++;
1605 break;
1606
1607 case FORMAT_TYPE_NRCHARS: {
1608 /* skip %n 's argument */
1609 u8 qualifier = spec.qualifier;
1610 void *skip_arg;
1611 if (qualifier == 'l')
1612 skip_arg = va_arg(args, long *);
1613 else if (TOLOWER(qualifier) == 'z')
1614 skip_arg = va_arg(args, size_t *);
1615 else
1616 skip_arg = va_arg(args, int *);
1617 break;
1618 }
1619
1620 default:
1621 switch (spec.type) {
1622
1623 case FORMAT_TYPE_LONG_LONG:
1624 save_arg(long long);
1625 break;
1626 case FORMAT_TYPE_ULONG:
1627 case FORMAT_TYPE_LONG:
1628 save_arg(unsigned long);
1629 break;
1630 case FORMAT_TYPE_SIZE_T:
1631 save_arg(size_t);
1632 break;
1633 case FORMAT_TYPE_PTRDIFF:
1634 save_arg(ptrdiff_t);
1635 break;
1636 case FORMAT_TYPE_UBYTE:
1637 case FORMAT_TYPE_BYTE:
1638 save_arg(char);
1639 break;
1640 case FORMAT_TYPE_USHORT:
1641 case FORMAT_TYPE_SHORT:
1642 save_arg(short);
1643 break;
1644 default:
1645 save_arg(int);
1646 }
1647 }
1648 }
1649
1650 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
1651 #undef save_arg
1652 }
1653 EXPORT_SYMBOL_GPL(vbin_printf);
1654
1655 /**
1656 * bstr_printf - Format a string from binary arguments and place it in a buffer
1657 * @buf: The buffer to place the result into
1658 * @size: The size of the buffer, including the trailing null space
1659 * @fmt: The format string to use
1660 * @bin_buf: Binary arguments for the format string
1661 *
1662 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1663 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1664 * a binary buffer that generated by vbin_printf.
1665 *
1666 * The format follows C99 vsnprintf, but has some extensions:
1667 * see vsnprintf comment for details.
1668 *
1669 * The return value is the number of characters which would
1670 * be generated for the given input, excluding the trailing
1671 * '\0', as per ISO C99. If you want to have the exact
1672 * number of characters written into @buf as return value
1673 * (not including the trailing '\0'), use vscnprintf(). If the
1674 * return is greater than or equal to @size, the resulting
1675 * string is truncated.
1676 */
1677 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1678 {
1679 struct printf_spec spec = {0};
1680 char *str, *end;
1681 const char *args = (const char *)bin_buf;
1682
1683 if (WARN_ON_ONCE((int) size < 0))
1684 return 0;
1685
1686 str = buf;
1687 end = buf + size;
1688
1689 #define get_arg(type) \
1690 ({ \
1691 typeof(type) value; \
1692 if (sizeof(type) == 8) { \
1693 args = PTR_ALIGN(args, sizeof(u32)); \
1694 *(u32 *)&value = *(u32 *)args; \
1695 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1696 } else { \
1697 args = PTR_ALIGN(args, sizeof(type)); \
1698 value = *(typeof(type) *)args; \
1699 } \
1700 args += sizeof(type); \
1701 value; \
1702 })
1703
1704 /* Make sure end is always >= buf */
1705 if (end < buf) {
1706 end = ((void *)-1);
1707 size = end - buf;
1708 }
1709
1710 while (*fmt) {
1711 const char *old_fmt = fmt;
1712 int read = format_decode(fmt, &spec);
1713
1714 fmt += read;
1715
1716 switch (spec.type) {
1717 case FORMAT_TYPE_NONE: {
1718 int copy = read;
1719 if (str < end) {
1720 if (copy > end - str)
1721 copy = end - str;
1722 memcpy(str, old_fmt, copy);
1723 }
1724 str += read;
1725 break;
1726 }
1727
1728 case FORMAT_TYPE_WIDTH:
1729 spec.field_width = get_arg(int);
1730 break;
1731
1732 case FORMAT_TYPE_PRECISION:
1733 spec.precision = get_arg(int);
1734 break;
1735
1736 case FORMAT_TYPE_CHAR: {
1737 char c;
1738
1739 if (!(spec.flags & LEFT)) {
1740 while (--spec.field_width > 0) {
1741 if (str < end)
1742 *str = ' ';
1743 ++str;
1744 }
1745 }
1746 c = (unsigned char) get_arg(char);
1747 if (str < end)
1748 *str = c;
1749 ++str;
1750 while (--spec.field_width > 0) {
1751 if (str < end)
1752 *str = ' ';
1753 ++str;
1754 }
1755 break;
1756 }
1757
1758 case FORMAT_TYPE_STR: {
1759 const char *str_arg = args;
1760 args += strlen(str_arg) + 1;
1761 str = string(str, end, (char *)str_arg, spec);
1762 break;
1763 }
1764
1765 case FORMAT_TYPE_PTR:
1766 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1767 while (isalnum(*fmt))
1768 fmt++;
1769 break;
1770
1771 case FORMAT_TYPE_PERCENT_CHAR:
1772 case FORMAT_TYPE_INVALID:
1773 if (str < end)
1774 *str = '%';
1775 ++str;
1776 break;
1777
1778 case FORMAT_TYPE_NRCHARS:
1779 /* skip */
1780 break;
1781
1782 default: {
1783 unsigned long long num;
1784
1785 switch (spec.type) {
1786
1787 case FORMAT_TYPE_LONG_LONG:
1788 num = get_arg(long long);
1789 break;
1790 case FORMAT_TYPE_ULONG:
1791 case FORMAT_TYPE_LONG:
1792 num = get_arg(unsigned long);
1793 break;
1794 case FORMAT_TYPE_SIZE_T:
1795 num = get_arg(size_t);
1796 break;
1797 case FORMAT_TYPE_PTRDIFF:
1798 num = get_arg(ptrdiff_t);
1799 break;
1800 case FORMAT_TYPE_UBYTE:
1801 num = get_arg(unsigned char);
1802 break;
1803 case FORMAT_TYPE_BYTE:
1804 num = get_arg(signed char);
1805 break;
1806 case FORMAT_TYPE_USHORT:
1807 num = get_arg(unsigned short);
1808 break;
1809 case FORMAT_TYPE_SHORT:
1810 num = get_arg(short);
1811 break;
1812 case FORMAT_TYPE_UINT:
1813 num = get_arg(unsigned int);
1814 break;
1815 default:
1816 num = get_arg(int);
1817 }
1818
1819 str = number(str, end, num, spec);
1820 } /* default: */
1821 } /* switch(spec.type) */
1822 } /* while(*fmt) */
1823
1824 if (size > 0) {
1825 if (str < end)
1826 *str = '\0';
1827 else
1828 end[-1] = '\0';
1829 }
1830
1831 #undef get_arg
1832
1833 /* the trailing null byte doesn't count towards the total */
1834 return str - buf;
1835 }
1836 EXPORT_SYMBOL_GPL(bstr_printf);
1837
1838 /**
1839 * bprintf - Parse a format string and place args' binary value in a buffer
1840 * @bin_buf: The buffer to place args' binary value
1841 * @size: The size of the buffer(by words(32bits), not characters)
1842 * @fmt: The format string to use
1843 * @...: Arguments for the format string
1844 *
1845 * The function returns the number of words(u32) written
1846 * into @bin_buf.
1847 */
1848 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1849 {
1850 va_list args;
1851 int ret;
1852
1853 va_start(args, fmt);
1854 ret = vbin_printf(bin_buf, size, fmt, args);
1855 va_end(args);
1856
1857 return ret;
1858 }
1859 EXPORT_SYMBOL_GPL(bprintf);
1860
1861 #endif /* CONFIG_BINARY_PRINTF */
1862
1863 /**
1864 * vsscanf - Unformat a buffer into a list of arguments
1865 * @buf: input buffer
1866 * @fmt: format of buffer
1867 * @args: arguments
1868 */
1869 int vsscanf(const char *buf, const char *fmt, va_list args)
1870 {
1871 const char *str = buf;
1872 char *next;
1873 char digit;
1874 int num = 0;
1875 u8 qualifier;
1876 u8 base;
1877 s16 field_width;
1878 bool is_sign;
1879
1880 while (*fmt && *str) {
1881 /* skip any white space in format */
1882 /* white space in format matchs any amount of
1883 * white space, including none, in the input.
1884 */
1885 if (isspace(*fmt)) {
1886 fmt = skip_spaces(++fmt);
1887 str = skip_spaces(str);
1888 }
1889
1890 /* anything that is not a conversion must match exactly */
1891 if (*fmt != '%' && *fmt) {
1892 if (*fmt++ != *str++)
1893 break;
1894 continue;
1895 }
1896
1897 if (!*fmt)
1898 break;
1899 ++fmt;
1900
1901 /* skip this conversion.
1902 * advance both strings to next white space
1903 */
1904 if (*fmt == '*') {
1905 while (!isspace(*fmt) && *fmt != '%' && *fmt)
1906 fmt++;
1907 while (!isspace(*str) && *str)
1908 str++;
1909 continue;
1910 }
1911
1912 /* get field width */
1913 field_width = -1;
1914 if (isdigit(*fmt))
1915 field_width = skip_atoi(&fmt);
1916
1917 /* get conversion qualifier */
1918 qualifier = -1;
1919 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1920 TOLOWER(*fmt) == 'z') {
1921 qualifier = *fmt++;
1922 if (unlikely(qualifier == *fmt)) {
1923 if (qualifier == 'h') {
1924 qualifier = 'H';
1925 fmt++;
1926 } else if (qualifier == 'l') {
1927 qualifier = 'L';
1928 fmt++;
1929 }
1930 }
1931 }
1932
1933 if (!*fmt || !*str)
1934 break;
1935
1936 base = 10;
1937 is_sign = 0;
1938
1939 switch (*fmt++) {
1940 case 'c':
1941 {
1942 char *s = (char *)va_arg(args, char*);
1943 if (field_width == -1)
1944 field_width = 1;
1945 do {
1946 *s++ = *str++;
1947 } while (--field_width > 0 && *str);
1948 num++;
1949 }
1950 continue;
1951 case 's':
1952 {
1953 char *s = (char *)va_arg(args, char *);
1954 if (field_width == -1)
1955 field_width = SHRT_MAX;
1956 /* first, skip leading white space in buffer */
1957 str = skip_spaces(str);
1958
1959 /* now copy until next white space */
1960 while (*str && !isspace(*str) && field_width--)
1961 *s++ = *str++;
1962 *s = '\0';
1963 num++;
1964 }
1965 continue;
1966 case 'n':
1967 /* return number of characters read so far */
1968 {
1969 int *i = (int *)va_arg(args, int*);
1970 *i = str - buf;
1971 }
1972 continue;
1973 case 'o':
1974 base = 8;
1975 break;
1976 case 'x':
1977 case 'X':
1978 base = 16;
1979 break;
1980 case 'i':
1981 base = 0;
1982 case 'd':
1983 is_sign = 1;
1984 case 'u':
1985 break;
1986 case '%':
1987 /* looking for '%' in str */
1988 if (*str++ != '%')
1989 return num;
1990 continue;
1991 default:
1992 /* invalid format; stop here */
1993 return num;
1994 }
1995
1996 /* have some sort of integer conversion.
1997 * first, skip white space in buffer.
1998 */
1999 str = skip_spaces(str);
2000
2001 digit = *str;
2002 if (is_sign && digit == '-')
2003 digit = *(str + 1);
2004
2005 if (!digit
2006 || (base == 16 && !isxdigit(digit))
2007 || (base == 10 && !isdigit(digit))
2008 || (base == 8 && (!isdigit(digit) || digit > '7'))
2009 || (base == 0 && !isdigit(digit)))
2010 break;
2011
2012 switch (qualifier) {
2013 case 'H': /* that's 'hh' in format */
2014 if (is_sign) {
2015 signed char *s = (signed char *)va_arg(args, signed char *);
2016 *s = (signed char)simple_strtol(str, &next, base);
2017 } else {
2018 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2019 *s = (unsigned char)simple_strtoul(str, &next, base);
2020 }
2021 break;
2022 case 'h':
2023 if (is_sign) {
2024 short *s = (short *)va_arg(args, short *);
2025 *s = (short)simple_strtol(str, &next, base);
2026 } else {
2027 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2028 *s = (unsigned short)simple_strtoul(str, &next, base);
2029 }
2030 break;
2031 case 'l':
2032 if (is_sign) {
2033 long *l = (long *)va_arg(args, long *);
2034 *l = simple_strtol(str, &next, base);
2035 } else {
2036 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2037 *l = simple_strtoul(str, &next, base);
2038 }
2039 break;
2040 case 'L':
2041 if (is_sign) {
2042 long long *l = (long long *)va_arg(args, long long *);
2043 *l = simple_strtoll(str, &next, base);
2044 } else {
2045 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2046 *l = simple_strtoull(str, &next, base);
2047 }
2048 break;
2049 case 'Z':
2050 case 'z':
2051 {
2052 size_t *s = (size_t *)va_arg(args, size_t *);
2053 *s = (size_t)simple_strtoul(str, &next, base);
2054 }
2055 break;
2056 default:
2057 if (is_sign) {
2058 int *i = (int *)va_arg(args, int *);
2059 *i = (int)simple_strtol(str, &next, base);
2060 } else {
2061 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2062 *i = (unsigned int)simple_strtoul(str, &next, base);
2063 }
2064 break;
2065 }
2066 num++;
2067
2068 if (!next)
2069 break;
2070 str = next;
2071 }
2072
2073 /*
2074 * Now we've come all the way through so either the input string or the
2075 * format ended. In the former case, there can be a %n at the current
2076 * position in the format that needs to be filled.
2077 */
2078 if (*fmt == '%' && *(fmt + 1) == 'n') {
2079 int *p = (int *)va_arg(args, int *);
2080 *p = str - buf;
2081 }
2082
2083 return num;
2084 }
2085 EXPORT_SYMBOL(vsscanf);
2086
2087 /**
2088 * sscanf - Unformat a buffer into a list of arguments
2089 * @buf: input buffer
2090 * @fmt: formatting of buffer
2091 * @...: resulting arguments
2092 */
2093 int sscanf(const char *buf, const char *fmt, ...)
2094 {
2095 va_list args;
2096 int i;
2097
2098 va_start(args, fmt);
2099 i = vsscanf(buf, fmt, args);
2100 va_end(args);
2101
2102 return i;
2103 }
2104 EXPORT_SYMBOL(sscanf);
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