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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 | static noinline_for_stack |
124 | int skip_atoi(const char **s) |
125 | { |
126 | int i = 0; |
127 | |
128 | while (isdigit(**s)) |
129 | i = i*10 + *((*s)++) - '0'; |
130 | |
131 | return i; |
132 | } |
133 | |
134 | /* Decimal conversion is by far the most typical, and is used |
135 | * for /proc and /sys data. This directly impacts e.g. top performance |
136 | * with many processes running. We optimize it for speed |
137 | * using code from |
138 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html |
139 | * (with permission from the author, Douglas W. Jones). */ |
140 | |
141 | /* Formats correctly any integer in [0,99999]. |
142 | * Outputs from one to five digits depending on input. |
143 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ |
144 | static noinline_for_stack |
145 | char *put_dec_trunc(char *buf, unsigned q) |
146 | { |
147 | unsigned d3, d2, d1, d0; |
148 | d1 = (q>>4) & 0xf; |
149 | d2 = (q>>8) & 0xf; |
150 | d3 = (q>>12); |
151 | |
152 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
153 | q = (d0 * 0xcd) >> 11; |
154 | d0 = d0 - 10*q; |
155 | *buf++ = d0 + '0'; /* least significant digit */ |
156 | d1 = q + 9*d3 + 5*d2 + d1; |
157 | if (d1 != 0) { |
158 | q = (d1 * 0xcd) >> 11; |
159 | d1 = d1 - 10*q; |
160 | *buf++ = d1 + '0'; /* next digit */ |
161 | |
162 | d2 = q + 2*d2; |
163 | if ((d2 != 0) || (d3 != 0)) { |
164 | q = (d2 * 0xd) >> 7; |
165 | d2 = d2 - 10*q; |
166 | *buf++ = d2 + '0'; /* next digit */ |
167 | |
168 | d3 = q + 4*d3; |
169 | if (d3 != 0) { |
170 | q = (d3 * 0xcd) >> 11; |
171 | d3 = d3 - 10*q; |
172 | *buf++ = d3 + '0'; /* next digit */ |
173 | if (q != 0) |
174 | *buf++ = q + '0'; /* most sign. digit */ |
175 | } |
176 | } |
177 | } |
178 | |
179 | return buf; |
180 | } |
181 | /* Same with if's removed. Always emits five digits */ |
182 | static noinline_for_stack |
183 | char *put_dec_full(char *buf, unsigned q) |
184 | { |
185 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ |
186 | /* but anyway, gcc produces better code with full-sized ints */ |
187 | unsigned d3, d2, d1, d0; |
188 | d1 = (q>>4) & 0xf; |
189 | d2 = (q>>8) & 0xf; |
190 | d3 = (q>>12); |
191 | |
192 | /* |
193 | * Possible ways to approx. divide by 10 |
194 | * gcc -O2 replaces multiply with shifts and adds |
195 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) |
196 | * (x * 0x67) >> 10: 1100111 |
197 | * (x * 0x34) >> 9: 110100 - same |
198 | * (x * 0x1a) >> 8: 11010 - same |
199 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) |
200 | */ |
201 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
202 | q = (d0 * 0xcd) >> 11; |
203 | d0 = d0 - 10*q; |
204 | *buf++ = d0 + '0'; |
205 | d1 = q + 9*d3 + 5*d2 + d1; |
206 | q = (d1 * 0xcd) >> 11; |
207 | d1 = d1 - 10*q; |
208 | *buf++ = d1 + '0'; |
209 | |
210 | d2 = q + 2*d2; |
211 | q = (d2 * 0xd) >> 7; |
212 | d2 = d2 - 10*q; |
213 | *buf++ = d2 + '0'; |
214 | |
215 | d3 = q + 4*d3; |
216 | q = (d3 * 0xcd) >> 11; /* - shorter code */ |
217 | /* q = (d3 * 0x67) >> 10; - would also work */ |
218 | d3 = d3 - 10*q; |
219 | *buf++ = d3 + '0'; |
220 | *buf++ = q + '0'; |
221 | |
222 | return buf; |
223 | } |
224 | /* No inlining helps gcc to use registers better */ |
225 | static noinline_for_stack |
226 | char *put_dec(char *buf, unsigned long long num) |
227 | { |
228 | while (1) { |
229 | unsigned rem; |
230 | if (num < 100000) |
231 | return put_dec_trunc(buf, num); |
232 | rem = do_div(num, 100000); |
233 | buf = put_dec_full(buf, rem); |
234 | } |
235 | } |
236 | |
237 | #define ZEROPAD 1 /* pad with zero */ |
238 | #define SIGN 2 /* unsigned/signed long */ |
239 | #define PLUS 4 /* show plus */ |
240 | #define SPACE 8 /* space if plus */ |
241 | #define LEFT 16 /* left justified */ |
242 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
243 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
244 | |
245 | enum format_type { |
246 | FORMAT_TYPE_NONE, /* Just a string part */ |
247 | FORMAT_TYPE_WIDTH, |
248 | FORMAT_TYPE_PRECISION, |
249 | FORMAT_TYPE_CHAR, |
250 | FORMAT_TYPE_STR, |
251 | FORMAT_TYPE_PTR, |
252 | FORMAT_TYPE_PERCENT_CHAR, |
253 | FORMAT_TYPE_INVALID, |
254 | FORMAT_TYPE_LONG_LONG, |
255 | FORMAT_TYPE_ULONG, |
256 | FORMAT_TYPE_LONG, |
257 | FORMAT_TYPE_UBYTE, |
258 | FORMAT_TYPE_BYTE, |
259 | FORMAT_TYPE_USHORT, |
260 | FORMAT_TYPE_SHORT, |
261 | FORMAT_TYPE_UINT, |
262 | FORMAT_TYPE_INT, |
263 | FORMAT_TYPE_NRCHARS, |
264 | FORMAT_TYPE_SIZE_T, |
265 | FORMAT_TYPE_PTRDIFF |
266 | }; |
267 | |
268 | struct printf_spec { |
269 | u8 type; /* format_type enum */ |
270 | u8 flags; /* flags to number() */ |
271 | u8 base; /* number base, 8, 10 or 16 only */ |
272 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ |
273 | s16 field_width; /* width of output field */ |
274 | s16 precision; /* # of digits/chars */ |
275 | }; |
276 | |
277 | static noinline_for_stack |
278 | char *number(char *buf, char *end, unsigned long long num, |
279 | struct printf_spec spec) |
280 | { |
281 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
282 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
283 | |
284 | char tmp[66]; |
285 | char sign; |
286 | char locase; |
287 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
288 | int i; |
289 | |
290 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
291 | * produces same digits or (maybe lowercased) letters */ |
292 | locase = (spec.flags & SMALL); |
293 | if (spec.flags & LEFT) |
294 | spec.flags &= ~ZEROPAD; |
295 | sign = 0; |
296 | if (spec.flags & SIGN) { |
297 | if ((signed long long)num < 0) { |
298 | sign = '-'; |
299 | num = -(signed long long)num; |
300 | spec.field_width--; |
301 | } else if (spec.flags & PLUS) { |
302 | sign = '+'; |
303 | spec.field_width--; |
304 | } else if (spec.flags & SPACE) { |
305 | sign = ' '; |
306 | spec.field_width--; |
307 | } |
308 | } |
309 | if (need_pfx) { |
310 | spec.field_width--; |
311 | if (spec.base == 16) |
312 | spec.field_width--; |
313 | } |
314 | |
315 | /* generate full string in tmp[], in reverse order */ |
316 | i = 0; |
317 | if (num == 0) |
318 | tmp[i++] = '0'; |
319 | /* Generic code, for any base: |
320 | else do { |
321 | tmp[i++] = (digits[do_div(num,base)] | locase); |
322 | } while (num != 0); |
323 | */ |
324 | else if (spec.base != 10) { /* 8 or 16 */ |
325 | int mask = spec.base - 1; |
326 | int shift = 3; |
327 | |
328 | if (spec.base == 16) |
329 | shift = 4; |
330 | do { |
331 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
332 | num >>= shift; |
333 | } while (num); |
334 | } else { /* base 10 */ |
335 | i = put_dec(tmp, num) - tmp; |
336 | } |
337 | |
338 | /* printing 100 using %2d gives "100", not "00" */ |
339 | if (i > spec.precision) |
340 | spec.precision = i; |
341 | /* leading space padding */ |
342 | spec.field_width -= spec.precision; |
343 | if (!(spec.flags & (ZEROPAD+LEFT))) { |
344 | while (--spec.field_width >= 0) { |
345 | if (buf < end) |
346 | *buf = ' '; |
347 | ++buf; |
348 | } |
349 | } |
350 | /* sign */ |
351 | if (sign) { |
352 | if (buf < end) |
353 | *buf = sign; |
354 | ++buf; |
355 | } |
356 | /* "0x" / "0" prefix */ |
357 | if (need_pfx) { |
358 | if (buf < end) |
359 | *buf = '0'; |
360 | ++buf; |
361 | if (spec.base == 16) { |
362 | if (buf < end) |
363 | *buf = ('X' | locase); |
364 | ++buf; |
365 | } |
366 | } |
367 | /* zero or space padding */ |
368 | if (!(spec.flags & LEFT)) { |
369 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
370 | while (--spec.field_width >= 0) { |
371 | if (buf < end) |
372 | *buf = c; |
373 | ++buf; |
374 | } |
375 | } |
376 | /* hmm even more zero padding? */ |
377 | while (i <= --spec.precision) { |
378 | if (buf < end) |
379 | *buf = '0'; |
380 | ++buf; |
381 | } |
382 | /* actual digits of result */ |
383 | while (--i >= 0) { |
384 | if (buf < end) |
385 | *buf = tmp[i]; |
386 | ++buf; |
387 | } |
388 | /* trailing space padding */ |
389 | while (--spec.field_width >= 0) { |
390 | if (buf < end) |
391 | *buf = ' '; |
392 | ++buf; |
393 | } |
394 | |
395 | return buf; |
396 | } |
397 | |
398 | static noinline_for_stack |
399 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
400 | { |
401 | int len, i; |
402 | |
403 | if ((unsigned long)s < PAGE_SIZE) |
404 | s = "(null)"; |
405 | |
406 | len = strnlen(s, spec.precision); |
407 | |
408 | if (!(spec.flags & LEFT)) { |
409 | while (len < spec.field_width--) { |
410 | if (buf < end) |
411 | *buf = ' '; |
412 | ++buf; |
413 | } |
414 | } |
415 | for (i = 0; i < len; ++i) { |
416 | if (buf < end) |
417 | *buf = *s; |
418 | ++buf; ++s; |
419 | } |
420 | while (len < spec.field_width--) { |
421 | if (buf < end) |
422 | *buf = ' '; |
423 | ++buf; |
424 | } |
425 | |
426 | return buf; |
427 | } |
428 | |
429 | static noinline_for_stack |
430 | char *symbol_string(char *buf, char *end, void *ptr, |
431 | struct printf_spec spec, char ext) |
432 | { |
433 | unsigned long value = (unsigned long) ptr; |
434 | #ifdef CONFIG_KALLSYMS |
435 | char sym[KSYM_SYMBOL_LEN]; |
436 | if (ext == 'B') |
437 | sprint_backtrace(sym, value); |
438 | else if (ext != 'f' && ext != 's') |
439 | sprint_symbol(sym, value); |
440 | else |
441 | kallsyms_lookup(value, NULL, NULL, NULL, sym); |
442 | |
443 | return string(buf, end, sym, spec); |
444 | #else |
445 | spec.field_width = 2 * sizeof(void *); |
446 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
447 | spec.base = 16; |
448 | |
449 | return number(buf, end, value, spec); |
450 | #endif |
451 | } |
452 | |
453 | static noinline_for_stack |
454 | char *resource_string(char *buf, char *end, struct resource *res, |
455 | struct printf_spec spec, const char *fmt) |
456 | { |
457 | #ifndef IO_RSRC_PRINTK_SIZE |
458 | #define IO_RSRC_PRINTK_SIZE 6 |
459 | #endif |
460 | |
461 | #ifndef MEM_RSRC_PRINTK_SIZE |
462 | #define MEM_RSRC_PRINTK_SIZE 10 |
463 | #endif |
464 | static const struct printf_spec io_spec = { |
465 | .base = 16, |
466 | .field_width = IO_RSRC_PRINTK_SIZE, |
467 | .precision = -1, |
468 | .flags = SPECIAL | SMALL | ZEROPAD, |
469 | }; |
470 | static const struct printf_spec mem_spec = { |
471 | .base = 16, |
472 | .field_width = MEM_RSRC_PRINTK_SIZE, |
473 | .precision = -1, |
474 | .flags = SPECIAL | SMALL | ZEROPAD, |
475 | }; |
476 | static const struct printf_spec bus_spec = { |
477 | .base = 16, |
478 | .field_width = 2, |
479 | .precision = -1, |
480 | .flags = SMALL | ZEROPAD, |
481 | }; |
482 | static const struct printf_spec dec_spec = { |
483 | .base = 10, |
484 | .precision = -1, |
485 | .flags = 0, |
486 | }; |
487 | static const struct printf_spec str_spec = { |
488 | .field_width = -1, |
489 | .precision = 10, |
490 | .flags = LEFT, |
491 | }; |
492 | static const struct printf_spec flag_spec = { |
493 | .base = 16, |
494 | .precision = -1, |
495 | .flags = SPECIAL | SMALL, |
496 | }; |
497 | |
498 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) |
499 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ |
500 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) |
501 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) |
502 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
503 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
504 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, |
505 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; |
506 | |
507 | char *p = sym, *pend = sym + sizeof(sym); |
508 | int decode = (fmt[0] == 'R') ? 1 : 0; |
509 | const struct printf_spec *specp; |
510 | |
511 | *p++ = '['; |
512 | if (res->flags & IORESOURCE_IO) { |
513 | p = string(p, pend, "io ", str_spec); |
514 | specp = &io_spec; |
515 | } else if (res->flags & IORESOURCE_MEM) { |
516 | p = string(p, pend, "mem ", str_spec); |
517 | specp = &mem_spec; |
518 | } else if (res->flags & IORESOURCE_IRQ) { |
519 | p = string(p, pend, "irq ", str_spec); |
520 | specp = &dec_spec; |
521 | } else if (res->flags & IORESOURCE_DMA) { |
522 | p = string(p, pend, "dma ", str_spec); |
523 | specp = &dec_spec; |
524 | } else if (res->flags & IORESOURCE_BUS) { |
525 | p = string(p, pend, "bus ", str_spec); |
526 | specp = &bus_spec; |
527 | } else { |
528 | p = string(p, pend, "??? ", str_spec); |
529 | specp = &mem_spec; |
530 | decode = 0; |
531 | } |
532 | p = number(p, pend, res->start, *specp); |
533 | if (res->start != res->end) { |
534 | *p++ = '-'; |
535 | p = number(p, pend, res->end, *specp); |
536 | } |
537 | if (decode) { |
538 | if (res->flags & IORESOURCE_MEM_64) |
539 | p = string(p, pend, " 64bit", str_spec); |
540 | if (res->flags & IORESOURCE_PREFETCH) |
541 | p = string(p, pend, " pref", str_spec); |
542 | if (res->flags & IORESOURCE_WINDOW) |
543 | p = string(p, pend, " window", str_spec); |
544 | if (res->flags & IORESOURCE_DISABLED) |
545 | p = string(p, pend, " disabled", str_spec); |
546 | } else { |
547 | p = string(p, pend, " flags ", str_spec); |
548 | p = number(p, pend, res->flags, flag_spec); |
549 | } |
550 | *p++ = ']'; |
551 | *p = '\0'; |
552 | |
553 | return string(buf, end, sym, spec); |
554 | } |
555 | |
556 | static noinline_for_stack |
557 | char *mac_address_string(char *buf, char *end, u8 *addr, |
558 | struct printf_spec spec, const char *fmt) |
559 | { |
560 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
561 | char *p = mac_addr; |
562 | int i; |
563 | char separator; |
564 | |
565 | if (fmt[1] == 'F') { /* FDDI canonical format */ |
566 | separator = '-'; |
567 | } else { |
568 | separator = ':'; |
569 | } |
570 | |
571 | for (i = 0; i < 6; i++) { |
572 | p = pack_hex_byte(p, addr[i]); |
573 | if (fmt[0] == 'M' && i != 5) |
574 | *p++ = separator; |
575 | } |
576 | *p = '\0'; |
577 | |
578 | return string(buf, end, mac_addr, spec); |
579 | } |
580 | |
581 | static noinline_for_stack |
582 | char *ip4_string(char *p, const u8 *addr, const char *fmt) |
583 | { |
584 | int i; |
585 | bool leading_zeros = (fmt[0] == 'i'); |
586 | int index; |
587 | int step; |
588 | |
589 | switch (fmt[2]) { |
590 | case 'h': |
591 | #ifdef __BIG_ENDIAN |
592 | index = 0; |
593 | step = 1; |
594 | #else |
595 | index = 3; |
596 | step = -1; |
597 | #endif |
598 | break; |
599 | case 'l': |
600 | index = 3; |
601 | step = -1; |
602 | break; |
603 | case 'n': |
604 | case 'b': |
605 | default: |
606 | index = 0; |
607 | step = 1; |
608 | break; |
609 | } |
610 | for (i = 0; i < 4; i++) { |
611 | char temp[3]; /* hold each IP quad in reverse order */ |
612 | int digits = put_dec_trunc(temp, addr[index]) - temp; |
613 | if (leading_zeros) { |
614 | if (digits < 3) |
615 | *p++ = '0'; |
616 | if (digits < 2) |
617 | *p++ = '0'; |
618 | } |
619 | /* reverse the digits in the quad */ |
620 | while (digits--) |
621 | *p++ = temp[digits]; |
622 | if (i < 3) |
623 | *p++ = '.'; |
624 | index += step; |
625 | } |
626 | *p = '\0'; |
627 | |
628 | return p; |
629 | } |
630 | |
631 | static noinline_for_stack |
632 | char *ip6_compressed_string(char *p, const char *addr) |
633 | { |
634 | int i, j, range; |
635 | unsigned char zerolength[8]; |
636 | int longest = 1; |
637 | int colonpos = -1; |
638 | u16 word; |
639 | u8 hi, lo; |
640 | bool needcolon = false; |
641 | bool useIPv4; |
642 | struct in6_addr in6; |
643 | |
644 | memcpy(&in6, addr, sizeof(struct in6_addr)); |
645 | |
646 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); |
647 | |
648 | memset(zerolength, 0, sizeof(zerolength)); |
649 | |
650 | if (useIPv4) |
651 | range = 6; |
652 | else |
653 | range = 8; |
654 | |
655 | /* find position of longest 0 run */ |
656 | for (i = 0; i < range; i++) { |
657 | for (j = i; j < range; j++) { |
658 | if (in6.s6_addr16[j] != 0) |
659 | break; |
660 | zerolength[i]++; |
661 | } |
662 | } |
663 | for (i = 0; i < range; i++) { |
664 | if (zerolength[i] > longest) { |
665 | longest = zerolength[i]; |
666 | colonpos = i; |
667 | } |
668 | } |
669 | |
670 | /* emit address */ |
671 | for (i = 0; i < range; i++) { |
672 | if (i == colonpos) { |
673 | if (needcolon || i == 0) |
674 | *p++ = ':'; |
675 | *p++ = ':'; |
676 | needcolon = false; |
677 | i += longest - 1; |
678 | continue; |
679 | } |
680 | if (needcolon) { |
681 | *p++ = ':'; |
682 | needcolon = false; |
683 | } |
684 | /* hex u16 without leading 0s */ |
685 | word = ntohs(in6.s6_addr16[i]); |
686 | hi = word >> 8; |
687 | lo = word & 0xff; |
688 | if (hi) { |
689 | if (hi > 0x0f) |
690 | p = pack_hex_byte(p, hi); |
691 | else |
692 | *p++ = hex_asc_lo(hi); |
693 | p = pack_hex_byte(p, lo); |
694 | } |
695 | else if (lo > 0x0f) |
696 | p = pack_hex_byte(p, lo); |
697 | else |
698 | *p++ = hex_asc_lo(lo); |
699 | needcolon = true; |
700 | } |
701 | |
702 | if (useIPv4) { |
703 | if (needcolon) |
704 | *p++ = ':'; |
705 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
706 | } |
707 | *p = '\0'; |
708 | |
709 | return p; |
710 | } |
711 | |
712 | static noinline_for_stack |
713 | char *ip6_string(char *p, const char *addr, const char *fmt) |
714 | { |
715 | int i; |
716 | |
717 | for (i = 0; i < 8; i++) { |
718 | p = pack_hex_byte(p, *addr++); |
719 | p = pack_hex_byte(p, *addr++); |
720 | if (fmt[0] == 'I' && i != 7) |
721 | *p++ = ':'; |
722 | } |
723 | *p = '\0'; |
724 | |
725 | return p; |
726 | } |
727 | |
728 | static noinline_for_stack |
729 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, |
730 | struct printf_spec spec, const char *fmt) |
731 | { |
732 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; |
733 | |
734 | if (fmt[0] == 'I' && fmt[2] == 'c') |
735 | ip6_compressed_string(ip6_addr, addr); |
736 | else |
737 | ip6_string(ip6_addr, addr, fmt); |
738 | |
739 | return string(buf, end, ip6_addr, spec); |
740 | } |
741 | |
742 | static noinline_for_stack |
743 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
744 | struct printf_spec spec, const char *fmt) |
745 | { |
746 | char ip4_addr[sizeof("255.255.255.255")]; |
747 | |
748 | ip4_string(ip4_addr, addr, fmt); |
749 | |
750 | return string(buf, end, ip4_addr, spec); |
751 | } |
752 | |
753 | static noinline_for_stack |
754 | char *uuid_string(char *buf, char *end, const u8 *addr, |
755 | struct printf_spec spec, const char *fmt) |
756 | { |
757 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; |
758 | char *p = uuid; |
759 | int i; |
760 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
761 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
762 | const u8 *index = be; |
763 | bool uc = false; |
764 | |
765 | switch (*(++fmt)) { |
766 | case 'L': |
767 | uc = true; /* fall-through */ |
768 | case 'l': |
769 | index = le; |
770 | break; |
771 | case 'B': |
772 | uc = true; |
773 | break; |
774 | } |
775 | |
776 | for (i = 0; i < 16; i++) { |
777 | p = pack_hex_byte(p, addr[index[i]]); |
778 | switch (i) { |
779 | case 3: |
780 | case 5: |
781 | case 7: |
782 | case 9: |
783 | *p++ = '-'; |
784 | break; |
785 | } |
786 | } |
787 | |
788 | *p = 0; |
789 | |
790 | if (uc) { |
791 | p = uuid; |
792 | do { |
793 | *p = toupper(*p); |
794 | } while (*(++p)); |
795 | } |
796 | |
797 | return string(buf, end, uuid, spec); |
798 | } |
799 | |
800 | int kptr_restrict __read_mostly; |
801 | |
802 | /* |
803 | * Show a '%p' thing. A kernel extension is that the '%p' is followed |
804 | * by an extra set of alphanumeric characters that are extended format |
805 | * specifiers. |
806 | * |
807 | * Right now we handle: |
808 | * |
809 | * - 'F' For symbolic function descriptor pointers with offset |
810 | * - 'f' For simple symbolic function names without offset |
811 | * - 'S' For symbolic direct pointers with offset |
812 | * - 's' For symbolic direct pointers without offset |
813 | * - 'B' For backtraced symbolic direct pointers with offset |
814 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
815 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] |
816 | * - 'M' For a 6-byte MAC address, it prints the address in the |
817 | * usual colon-separated hex notation |
818 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
819 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
820 | * with a dash-separated hex notation |
821 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
822 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) |
823 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's |
824 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
825 | * IPv6 omits the colons (01020304...0f) |
826 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) |
827 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
828 | * - 'I6c' for IPv6 addresses printed as specified by |
829 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
830 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
831 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" |
832 | * Options for %pU are: |
833 | * b big endian lower case hex (default) |
834 | * B big endian UPPER case hex |
835 | * l little endian lower case hex |
836 | * L little endian UPPER case hex |
837 | * big endian output byte order is: |
838 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] |
839 | * little endian output byte order is: |
840 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] |
841 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
842 | * call vsnprintf(->format, *->va_list). |
843 | * Implements a "recursive vsnprintf". |
844 | * Do not use this feature without some mechanism to verify the |
845 | * correctness of the format string and va_list arguments. |
846 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
847 | * |
848 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
849 | * function pointers are really function descriptors, which contain a |
850 | * pointer to the real address. |
851 | */ |
852 | static noinline_for_stack |
853 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
854 | struct printf_spec spec) |
855 | { |
856 | if (!ptr && *fmt != 'K') { |
857 | /* |
858 | * Print (null) with the same width as a pointer so it makes |
859 | * tabular output look nice. |
860 | */ |
861 | if (spec.field_width == -1) |
862 | spec.field_width = 2 * sizeof(void *); |
863 | return string(buf, end, "(null)", spec); |
864 | } |
865 | |
866 | switch (*fmt) { |
867 | case 'F': |
868 | case 'f': |
869 | ptr = dereference_function_descriptor(ptr); |
870 | /* Fallthrough */ |
871 | case 'S': |
872 | case 's': |
873 | case 'B': |
874 | return symbol_string(buf, end, ptr, spec, *fmt); |
875 | case 'R': |
876 | case 'r': |
877 | return resource_string(buf, end, ptr, spec, fmt); |
878 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
879 | case 'm': /* Contiguous: 000102030405 */ |
880 | /* [mM]F (FDDI, bit reversed) */ |
881 | return mac_address_string(buf, end, ptr, spec, fmt); |
882 | case 'I': /* Formatted IP supported |
883 | * 4: 1.2.3.4 |
884 | * 6: 0001:0203:...:0708 |
885 | * 6c: 1::708 or 1::1.2.3.4 |
886 | */ |
887 | case 'i': /* Contiguous: |
888 | * 4: 001.002.003.004 |
889 | * 6: 000102...0f |
890 | */ |
891 | switch (fmt[1]) { |
892 | case '6': |
893 | return ip6_addr_string(buf, end, ptr, spec, fmt); |
894 | case '4': |
895 | return ip4_addr_string(buf, end, ptr, spec, fmt); |
896 | } |
897 | break; |
898 | case 'U': |
899 | return uuid_string(buf, end, ptr, spec, fmt); |
900 | case 'V': |
901 | return buf + vsnprintf(buf, end - buf, |
902 | ((struct va_format *)ptr)->fmt, |
903 | *(((struct va_format *)ptr)->va)); |
904 | case 'K': |
905 | /* |
906 | * %pK cannot be used in IRQ context because its test |
907 | * for CAP_SYSLOG would be meaningless. |
908 | */ |
909 | if (in_irq() || in_serving_softirq() || in_nmi()) { |
910 | if (spec.field_width == -1) |
911 | spec.field_width = 2 * sizeof(void *); |
912 | return string(buf, end, "pK-error", spec); |
913 | } |
914 | if (!((kptr_restrict == 0) || |
915 | (kptr_restrict == 1 && |
916 | has_capability_noaudit(current, CAP_SYSLOG)))) |
917 | ptr = NULL; |
918 | break; |
919 | } |
920 | spec.flags |= SMALL; |
921 | if (spec.field_width == -1) { |
922 | spec.field_width = 2 * sizeof(void *); |
923 | spec.flags |= ZEROPAD; |
924 | } |
925 | spec.base = 16; |
926 | |
927 | return number(buf, end, (unsigned long) ptr, spec); |
928 | } |
929 | |
930 | /* |
931 | * Helper function to decode printf style format. |
932 | * Each call decode a token from the format and return the |
933 | * number of characters read (or likely the delta where it wants |
934 | * to go on the next call). |
935 | * The decoded token is returned through the parameters |
936 | * |
937 | * 'h', 'l', or 'L' for integer fields |
938 | * 'z' support added 23/7/1999 S.H. |
939 | * 'z' changed to 'Z' --davidm 1/25/99 |
940 | * 't' added for ptrdiff_t |
941 | * |
942 | * @fmt: the format string |
943 | * @type of the token returned |
944 | * @flags: various flags such as +, -, # tokens.. |
945 | * @field_width: overwritten width |
946 | * @base: base of the number (octal, hex, ...) |
947 | * @precision: precision of a number |
948 | * @qualifier: qualifier of a number (long, size_t, ...) |
949 | */ |
950 | static noinline_for_stack |
951 | int format_decode(const char *fmt, struct printf_spec *spec) |
952 | { |
953 | const char *start = fmt; |
954 | |
955 | /* we finished early by reading the field width */ |
956 | if (spec->type == FORMAT_TYPE_WIDTH) { |
957 | if (spec->field_width < 0) { |
958 | spec->field_width = -spec->field_width; |
959 | spec->flags |= LEFT; |
960 | } |
961 | spec->type = FORMAT_TYPE_NONE; |
962 | goto precision; |
963 | } |
964 | |
965 | /* we finished early by reading the precision */ |
966 | if (spec->type == FORMAT_TYPE_PRECISION) { |
967 | if (spec->precision < 0) |
968 | spec->precision = 0; |
969 | |
970 | spec->type = FORMAT_TYPE_NONE; |
971 | goto qualifier; |
972 | } |
973 | |
974 | /* By default */ |
975 | spec->type = FORMAT_TYPE_NONE; |
976 | |
977 | for (; *fmt ; ++fmt) { |
978 | if (*fmt == '%') |
979 | break; |
980 | } |
981 | |
982 | /* Return the current non-format string */ |
983 | if (fmt != start || !*fmt) |
984 | return fmt - start; |
985 | |
986 | /* Process flags */ |
987 | spec->flags = 0; |
988 | |
989 | while (1) { /* this also skips first '%' */ |
990 | bool found = true; |
991 | |
992 | ++fmt; |
993 | |
994 | switch (*fmt) { |
995 | case '-': spec->flags |= LEFT; break; |
996 | case '+': spec->flags |= PLUS; break; |
997 | case ' ': spec->flags |= SPACE; break; |
998 | case '#': spec->flags |= SPECIAL; break; |
999 | case '0': spec->flags |= ZEROPAD; break; |
1000 | default: found = false; |
1001 | } |
1002 | |
1003 | if (!found) |
1004 | break; |
1005 | } |
1006 | |
1007 | /* get field width */ |
1008 | spec->field_width = -1; |
1009 | |
1010 | if (isdigit(*fmt)) |
1011 | spec->field_width = skip_atoi(&fmt); |
1012 | else if (*fmt == '*') { |
1013 | /* it's the next argument */ |
1014 | spec->type = FORMAT_TYPE_WIDTH; |
1015 | return ++fmt - start; |
1016 | } |
1017 | |
1018 | precision: |
1019 | /* get the precision */ |
1020 | spec->precision = -1; |
1021 | if (*fmt == '.') { |
1022 | ++fmt; |
1023 | if (isdigit(*fmt)) { |
1024 | spec->precision = skip_atoi(&fmt); |
1025 | if (spec->precision < 0) |
1026 | spec->precision = 0; |
1027 | } else if (*fmt == '*') { |
1028 | /* it's the next argument */ |
1029 | spec->type = FORMAT_TYPE_PRECISION; |
1030 | return ++fmt - start; |
1031 | } |
1032 | } |
1033 | |
1034 | qualifier: |
1035 | /* get the conversion qualifier */ |
1036 | spec->qualifier = -1; |
1037 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1038 | TOLOWER(*fmt) == 'z' || *fmt == 't') { |
1039 | spec->qualifier = *fmt++; |
1040 | if (unlikely(spec->qualifier == *fmt)) { |
1041 | if (spec->qualifier == 'l') { |
1042 | spec->qualifier = 'L'; |
1043 | ++fmt; |
1044 | } else if (spec->qualifier == 'h') { |
1045 | spec->qualifier = 'H'; |
1046 | ++fmt; |
1047 | } |
1048 | } |
1049 | } |
1050 | |
1051 | /* default base */ |
1052 | spec->base = 10; |
1053 | switch (*fmt) { |
1054 | case 'c': |
1055 | spec->type = FORMAT_TYPE_CHAR; |
1056 | return ++fmt - start; |
1057 | |
1058 | case 's': |
1059 | spec->type = FORMAT_TYPE_STR; |
1060 | return ++fmt - start; |
1061 | |
1062 | case 'p': |
1063 | spec->type = FORMAT_TYPE_PTR; |
1064 | return fmt - start; |
1065 | /* skip alnum */ |
1066 | |
1067 | case 'n': |
1068 | spec->type = FORMAT_TYPE_NRCHARS; |
1069 | return ++fmt - start; |
1070 | |
1071 | case '%': |
1072 | spec->type = FORMAT_TYPE_PERCENT_CHAR; |
1073 | return ++fmt - start; |
1074 | |
1075 | /* integer number formats - set up the flags and "break" */ |
1076 | case 'o': |
1077 | spec->base = 8; |
1078 | break; |
1079 | |
1080 | case 'x': |
1081 | spec->flags |= SMALL; |
1082 | |
1083 | case 'X': |
1084 | spec->base = 16; |
1085 | break; |
1086 | |
1087 | case 'd': |
1088 | case 'i': |
1089 | spec->flags |= SIGN; |
1090 | case 'u': |
1091 | break; |
1092 | |
1093 | default: |
1094 | spec->type = FORMAT_TYPE_INVALID; |
1095 | return fmt - start; |
1096 | } |
1097 | |
1098 | if (spec->qualifier == 'L') |
1099 | spec->type = FORMAT_TYPE_LONG_LONG; |
1100 | else if (spec->qualifier == 'l') { |
1101 | if (spec->flags & SIGN) |
1102 | spec->type = FORMAT_TYPE_LONG; |
1103 | else |
1104 | spec->type = FORMAT_TYPE_ULONG; |
1105 | } else if (TOLOWER(spec->qualifier) == 'z') { |
1106 | spec->type = FORMAT_TYPE_SIZE_T; |
1107 | } else if (spec->qualifier == 't') { |
1108 | spec->type = FORMAT_TYPE_PTRDIFF; |
1109 | } else if (spec->qualifier == 'H') { |
1110 | if (spec->flags & SIGN) |
1111 | spec->type = FORMAT_TYPE_BYTE; |
1112 | else |
1113 | spec->type = FORMAT_TYPE_UBYTE; |
1114 | } else if (spec->qualifier == 'h') { |
1115 | if (spec->flags & SIGN) |
1116 | spec->type = FORMAT_TYPE_SHORT; |
1117 | else |
1118 | spec->type = FORMAT_TYPE_USHORT; |
1119 | } else { |
1120 | if (spec->flags & SIGN) |
1121 | spec->type = FORMAT_TYPE_INT; |
1122 | else |
1123 | spec->type = FORMAT_TYPE_UINT; |
1124 | } |
1125 | |
1126 | return ++fmt - start; |
1127 | } |
1128 | |
1129 | /** |
1130 | * vsnprintf - Format a string and place it in a buffer |
1131 | * @buf: The buffer to place the result into |
1132 | * @size: The size of the buffer, including the trailing null space |
1133 | * @fmt: The format string to use |
1134 | * @args: Arguments for the format string |
1135 | * |
1136 | * This function follows C99 vsnprintf, but has some extensions: |
1137 | * %pS output the name of a text symbol with offset |
1138 | * %ps output the name of a text symbol without offset |
1139 | * %pF output the name of a function pointer with its offset |
1140 | * %pf output the name of a function pointer without its offset |
1141 | * %pB output the name of a backtrace symbol with its offset |
1142 | * %pR output the address range in a struct resource with decoded flags |
1143 | * %pr output the address range in a struct resource with raw flags |
1144 | * %pM output a 6-byte MAC address with colons |
1145 | * %pm output a 6-byte MAC address without colons |
1146 | * %pI4 print an IPv4 address without leading zeros |
1147 | * %pi4 print an IPv4 address with leading zeros |
1148 | * %pI6 print an IPv6 address with colons |
1149 | * %pi6 print an IPv6 address without colons |
1150 | * %pI6c print an IPv6 address as specified by |
1151 | * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00 |
1152 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1153 | * case. |
1154 | * %n is ignored |
1155 | * |
1156 | * The return value is the number of characters which would |
1157 | * be generated for the given input, excluding the trailing |
1158 | * '\0', as per ISO C99. If you want to have the exact |
1159 | * number of characters written into @buf as return value |
1160 | * (not including the trailing '\0'), use vscnprintf(). If the |
1161 | * return is greater than or equal to @size, the resulting |
1162 | * string is truncated. |
1163 | * |
1164 | * Call this function if you are already dealing with a va_list. |
1165 | * You probably want snprintf() instead. |
1166 | */ |
1167 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1168 | { |
1169 | unsigned long long num; |
1170 | char *str, *end; |
1171 | struct printf_spec spec = {0}; |
1172 | |
1173 | /* Reject out-of-range values early. Large positive sizes are |
1174 | used for unknown buffer sizes. */ |
1175 | if (WARN_ON_ONCE((int) size < 0)) |
1176 | return 0; |
1177 | |
1178 | str = buf; |
1179 | end = buf + size; |
1180 | |
1181 | /* Make sure end is always >= buf */ |
1182 | if (end < buf) { |
1183 | end = ((void *)-1); |
1184 | size = end - buf; |
1185 | } |
1186 | |
1187 | while (*fmt) { |
1188 | const char *old_fmt = fmt; |
1189 | int read = format_decode(fmt, &spec); |
1190 | |
1191 | fmt += read; |
1192 | |
1193 | switch (spec.type) { |
1194 | case FORMAT_TYPE_NONE: { |
1195 | int copy = read; |
1196 | if (str < end) { |
1197 | if (copy > end - str) |
1198 | copy = end - str; |
1199 | memcpy(str, old_fmt, copy); |
1200 | } |
1201 | str += read; |
1202 | break; |
1203 | } |
1204 | |
1205 | case FORMAT_TYPE_WIDTH: |
1206 | spec.field_width = va_arg(args, int); |
1207 | break; |
1208 | |
1209 | case FORMAT_TYPE_PRECISION: |
1210 | spec.precision = va_arg(args, int); |
1211 | break; |
1212 | |
1213 | case FORMAT_TYPE_CHAR: { |
1214 | char c; |
1215 | |
1216 | if (!(spec.flags & LEFT)) { |
1217 | while (--spec.field_width > 0) { |
1218 | if (str < end) |
1219 | *str = ' '; |
1220 | ++str; |
1221 | |
1222 | } |
1223 | } |
1224 | c = (unsigned char) va_arg(args, int); |
1225 | if (str < end) |
1226 | *str = c; |
1227 | ++str; |
1228 | while (--spec.field_width > 0) { |
1229 | if (str < end) |
1230 | *str = ' '; |
1231 | ++str; |
1232 | } |
1233 | break; |
1234 | } |
1235 | |
1236 | case FORMAT_TYPE_STR: |
1237 | str = string(str, end, va_arg(args, char *), spec); |
1238 | break; |
1239 | |
1240 | case FORMAT_TYPE_PTR: |
1241 | str = pointer(fmt+1, str, end, va_arg(args, void *), |
1242 | spec); |
1243 | while (isalnum(*fmt)) |
1244 | fmt++; |
1245 | break; |
1246 | |
1247 | case FORMAT_TYPE_PERCENT_CHAR: |
1248 | if (str < end) |
1249 | *str = '%'; |
1250 | ++str; |
1251 | break; |
1252 | |
1253 | case FORMAT_TYPE_INVALID: |
1254 | if (str < end) |
1255 | *str = '%'; |
1256 | ++str; |
1257 | break; |
1258 | |
1259 | case FORMAT_TYPE_NRCHARS: { |
1260 | u8 qualifier = spec.qualifier; |
1261 | |
1262 | if (qualifier == 'l') { |
1263 | long *ip = va_arg(args, long *); |
1264 | *ip = (str - buf); |
1265 | } else if (TOLOWER(qualifier) == 'z') { |
1266 | size_t *ip = va_arg(args, size_t *); |
1267 | *ip = (str - buf); |
1268 | } else { |
1269 | int *ip = va_arg(args, int *); |
1270 | *ip = (str - buf); |
1271 | } |
1272 | break; |
1273 | } |
1274 | |
1275 | default: |
1276 | switch (spec.type) { |
1277 | case FORMAT_TYPE_LONG_LONG: |
1278 | num = va_arg(args, long long); |
1279 | break; |
1280 | case FORMAT_TYPE_ULONG: |
1281 | num = va_arg(args, unsigned long); |
1282 | break; |
1283 | case FORMAT_TYPE_LONG: |
1284 | num = va_arg(args, long); |
1285 | break; |
1286 | case FORMAT_TYPE_SIZE_T: |
1287 | num = va_arg(args, size_t); |
1288 | break; |
1289 | case FORMAT_TYPE_PTRDIFF: |
1290 | num = va_arg(args, ptrdiff_t); |
1291 | break; |
1292 | case FORMAT_TYPE_UBYTE: |
1293 | num = (unsigned char) va_arg(args, int); |
1294 | break; |
1295 | case FORMAT_TYPE_BYTE: |
1296 | num = (signed char) va_arg(args, int); |
1297 | break; |
1298 | case FORMAT_TYPE_USHORT: |
1299 | num = (unsigned short) va_arg(args, int); |
1300 | break; |
1301 | case FORMAT_TYPE_SHORT: |
1302 | num = (short) va_arg(args, int); |
1303 | break; |
1304 | case FORMAT_TYPE_INT: |
1305 | num = (int) va_arg(args, int); |
1306 | break; |
1307 | default: |
1308 | num = va_arg(args, unsigned int); |
1309 | } |
1310 | |
1311 | str = number(str, end, num, spec); |
1312 | } |
1313 | } |
1314 | |
1315 | if (size > 0) { |
1316 | if (str < end) |
1317 | *str = '\0'; |
1318 | else |
1319 | end[-1] = '\0'; |
1320 | } |
1321 | |
1322 | /* the trailing null byte doesn't count towards the total */ |
1323 | return str-buf; |
1324 | |
1325 | } |
1326 | EXPORT_SYMBOL(vsnprintf); |
1327 | |
1328 | /** |
1329 | * vscnprintf - Format a string and place it in a buffer |
1330 | * @buf: The buffer to place the result into |
1331 | * @size: The size of the buffer, including the trailing null space |
1332 | * @fmt: The format string to use |
1333 | * @args: Arguments for the format string |
1334 | * |
1335 | * The return value is the number of characters which have been written into |
1336 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1337 | * returns 0. |
1338 | * |
1339 | * Call this function if you are already dealing with a va_list. |
1340 | * You probably want scnprintf() instead. |
1341 | * |
1342 | * See the vsnprintf() documentation for format string extensions over C99. |
1343 | */ |
1344 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1345 | { |
1346 | int i; |
1347 | |
1348 | i = vsnprintf(buf, size, fmt, args); |
1349 | |
1350 | if (likely(i < size)) |
1351 | return i; |
1352 | if (size != 0) |
1353 | return size - 1; |
1354 | return 0; |
1355 | } |
1356 | EXPORT_SYMBOL(vscnprintf); |
1357 | |
1358 | /** |
1359 | * snprintf - Format a string and place it in a buffer |
1360 | * @buf: The buffer to place the result into |
1361 | * @size: The size of the buffer, including the trailing null space |
1362 | * @fmt: The format string to use |
1363 | * @...: Arguments for the format string |
1364 | * |
1365 | * The return value is the number of characters which would be |
1366 | * generated for the given input, excluding the trailing null, |
1367 | * as per ISO C99. If the return is greater than or equal to |
1368 | * @size, the resulting string is truncated. |
1369 | * |
1370 | * See the vsnprintf() documentation for format string extensions over C99. |
1371 | */ |
1372 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1373 | { |
1374 | va_list args; |
1375 | int i; |
1376 | |
1377 | va_start(args, fmt); |
1378 | i = vsnprintf(buf, size, fmt, args); |
1379 | va_end(args); |
1380 | |
1381 | return i; |
1382 | } |
1383 | EXPORT_SYMBOL(snprintf); |
1384 | |
1385 | /** |
1386 | * scnprintf - Format a string and place it in a buffer |
1387 | * @buf: The buffer to place the result into |
1388 | * @size: The size of the buffer, including the trailing null space |
1389 | * @fmt: The format string to use |
1390 | * @...: Arguments for the format string |
1391 | * |
1392 | * The return value is the number of characters written into @buf not including |
1393 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1394 | */ |
1395 | |
1396 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1397 | { |
1398 | va_list args; |
1399 | int i; |
1400 | |
1401 | va_start(args, fmt); |
1402 | i = vscnprintf(buf, size, fmt, args); |
1403 | va_end(args); |
1404 | |
1405 | return i; |
1406 | } |
1407 | EXPORT_SYMBOL(scnprintf); |
1408 | |
1409 | /** |
1410 | * vsprintf - Format a string and place it in a buffer |
1411 | * @buf: The buffer to place the result into |
1412 | * @fmt: The format string to use |
1413 | * @args: Arguments for the format string |
1414 | * |
1415 | * The function returns the number of characters written |
1416 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1417 | * buffer overflows. |
1418 | * |
1419 | * Call this function if you are already dealing with a va_list. |
1420 | * You probably want sprintf() instead. |
1421 | * |
1422 | * See the vsnprintf() documentation for format string extensions over C99. |
1423 | */ |
1424 | int vsprintf(char *buf, const char *fmt, va_list args) |
1425 | { |
1426 | return vsnprintf(buf, INT_MAX, fmt, args); |
1427 | } |
1428 | EXPORT_SYMBOL(vsprintf); |
1429 | |
1430 | /** |
1431 | * sprintf - Format a string and place it in a buffer |
1432 | * @buf: The buffer to place the result into |
1433 | * @fmt: The format string to use |
1434 | * @...: Arguments for the format string |
1435 | * |
1436 | * The function returns the number of characters written |
1437 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1438 | * buffer overflows. |
1439 | * |
1440 | * See the vsnprintf() documentation for format string extensions over C99. |
1441 | */ |
1442 | int sprintf(char *buf, const char *fmt, ...) |
1443 | { |
1444 | va_list args; |
1445 | int i; |
1446 | |
1447 | va_start(args, fmt); |
1448 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1449 | va_end(args); |
1450 | |
1451 | return i; |
1452 | } |
1453 | EXPORT_SYMBOL(sprintf); |
1454 | |
1455 | #ifdef CONFIG_BINARY_PRINTF |
1456 | /* |
1457 | * bprintf service: |
1458 | * vbin_printf() - VA arguments to binary data |
1459 | * bstr_printf() - Binary data to text string |
1460 | */ |
1461 | |
1462 | /** |
1463 | * vbin_printf - Parse a format string and place args' binary value in a buffer |
1464 | * @bin_buf: The buffer to place args' binary value |
1465 | * @size: The size of the buffer(by words(32bits), not characters) |
1466 | * @fmt: The format string to use |
1467 | * @args: Arguments for the format string |
1468 | * |
1469 | * The format follows C99 vsnprintf, except %n is ignored, and its argument |
1470 | * is skiped. |
1471 | * |
1472 | * The return value is the number of words(32bits) which would be generated for |
1473 | * the given input. |
1474 | * |
1475 | * NOTE: |
1476 | * If the return value is greater than @size, the resulting bin_buf is NOT |
1477 | * valid for bstr_printf(). |
1478 | */ |
1479 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) |
1480 | { |
1481 | struct printf_spec spec = {0}; |
1482 | char *str, *end; |
1483 | |
1484 | str = (char *)bin_buf; |
1485 | end = (char *)(bin_buf + size); |
1486 | |
1487 | #define save_arg(type) \ |
1488 | do { \ |
1489 | if (sizeof(type) == 8) { \ |
1490 | unsigned long long value; \ |
1491 | str = PTR_ALIGN(str, sizeof(u32)); \ |
1492 | value = va_arg(args, unsigned long long); \ |
1493 | if (str + sizeof(type) <= end) { \ |
1494 | *(u32 *)str = *(u32 *)&value; \ |
1495 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ |
1496 | } \ |
1497 | } else { \ |
1498 | unsigned long value; \ |
1499 | str = PTR_ALIGN(str, sizeof(type)); \ |
1500 | value = va_arg(args, int); \ |
1501 | if (str + sizeof(type) <= end) \ |
1502 | *(typeof(type) *)str = (type)value; \ |
1503 | } \ |
1504 | str += sizeof(type); \ |
1505 | } while (0) |
1506 | |
1507 | while (*fmt) { |
1508 | int read = format_decode(fmt, &spec); |
1509 | |
1510 | fmt += read; |
1511 | |
1512 | switch (spec.type) { |
1513 | case FORMAT_TYPE_NONE: |
1514 | case FORMAT_TYPE_INVALID: |
1515 | case FORMAT_TYPE_PERCENT_CHAR: |
1516 | break; |
1517 | |
1518 | case FORMAT_TYPE_WIDTH: |
1519 | case FORMAT_TYPE_PRECISION: |
1520 | save_arg(int); |
1521 | break; |
1522 | |
1523 | case FORMAT_TYPE_CHAR: |
1524 | save_arg(char); |
1525 | break; |
1526 | |
1527 | case FORMAT_TYPE_STR: { |
1528 | const char *save_str = va_arg(args, char *); |
1529 | size_t len; |
1530 | |
1531 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1532 | || (unsigned long)save_str < PAGE_SIZE) |
1533 | save_str = "(null)"; |
1534 | len = strlen(save_str) + 1; |
1535 | if (str + len < end) |
1536 | memcpy(str, save_str, len); |
1537 | str += len; |
1538 | break; |
1539 | } |
1540 | |
1541 | case FORMAT_TYPE_PTR: |
1542 | save_arg(void *); |
1543 | /* skip all alphanumeric pointer suffixes */ |
1544 | while (isalnum(*fmt)) |
1545 | fmt++; |
1546 | break; |
1547 | |
1548 | case FORMAT_TYPE_NRCHARS: { |
1549 | /* skip %n 's argument */ |
1550 | u8 qualifier = spec.qualifier; |
1551 | void *skip_arg; |
1552 | if (qualifier == 'l') |
1553 | skip_arg = va_arg(args, long *); |
1554 | else if (TOLOWER(qualifier) == 'z') |
1555 | skip_arg = va_arg(args, size_t *); |
1556 | else |
1557 | skip_arg = va_arg(args, int *); |
1558 | break; |
1559 | } |
1560 | |
1561 | default: |
1562 | switch (spec.type) { |
1563 | |
1564 | case FORMAT_TYPE_LONG_LONG: |
1565 | save_arg(long long); |
1566 | break; |
1567 | case FORMAT_TYPE_ULONG: |
1568 | case FORMAT_TYPE_LONG: |
1569 | save_arg(unsigned long); |
1570 | break; |
1571 | case FORMAT_TYPE_SIZE_T: |
1572 | save_arg(size_t); |
1573 | break; |
1574 | case FORMAT_TYPE_PTRDIFF: |
1575 | save_arg(ptrdiff_t); |
1576 | break; |
1577 | case FORMAT_TYPE_UBYTE: |
1578 | case FORMAT_TYPE_BYTE: |
1579 | save_arg(char); |
1580 | break; |
1581 | case FORMAT_TYPE_USHORT: |
1582 | case FORMAT_TYPE_SHORT: |
1583 | save_arg(short); |
1584 | break; |
1585 | default: |
1586 | save_arg(int); |
1587 | } |
1588 | } |
1589 | } |
1590 | |
1591 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
1592 | #undef save_arg |
1593 | } |
1594 | EXPORT_SYMBOL_GPL(vbin_printf); |
1595 | |
1596 | /** |
1597 | * bstr_printf - Format a string from binary arguments and place it in a buffer |
1598 | * @buf: The buffer to place the result into |
1599 | * @size: The size of the buffer, including the trailing null space |
1600 | * @fmt: The format string to use |
1601 | * @bin_buf: Binary arguments for the format string |
1602 | * |
1603 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets |
1604 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is |
1605 | * a binary buffer that generated by vbin_printf. |
1606 | * |
1607 | * The format follows C99 vsnprintf, but has some extensions: |
1608 | * see vsnprintf comment for details. |
1609 | * |
1610 | * The return value is the number of characters which would |
1611 | * be generated for the given input, excluding the trailing |
1612 | * '\0', as per ISO C99. If you want to have the exact |
1613 | * number of characters written into @buf as return value |
1614 | * (not including the trailing '\0'), use vscnprintf(). If the |
1615 | * return is greater than or equal to @size, the resulting |
1616 | * string is truncated. |
1617 | */ |
1618 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) |
1619 | { |
1620 | struct printf_spec spec = {0}; |
1621 | char *str, *end; |
1622 | const char *args = (const char *)bin_buf; |
1623 | |
1624 | if (WARN_ON_ONCE((int) size < 0)) |
1625 | return 0; |
1626 | |
1627 | str = buf; |
1628 | end = buf + size; |
1629 | |
1630 | #define get_arg(type) \ |
1631 | ({ \ |
1632 | typeof(type) value; \ |
1633 | if (sizeof(type) == 8) { \ |
1634 | args = PTR_ALIGN(args, sizeof(u32)); \ |
1635 | *(u32 *)&value = *(u32 *)args; \ |
1636 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ |
1637 | } else { \ |
1638 | args = PTR_ALIGN(args, sizeof(type)); \ |
1639 | value = *(typeof(type) *)args; \ |
1640 | } \ |
1641 | args += sizeof(type); \ |
1642 | value; \ |
1643 | }) |
1644 | |
1645 | /* Make sure end is always >= buf */ |
1646 | if (end < buf) { |
1647 | end = ((void *)-1); |
1648 | size = end - buf; |
1649 | } |
1650 | |
1651 | while (*fmt) { |
1652 | const char *old_fmt = fmt; |
1653 | int read = format_decode(fmt, &spec); |
1654 | |
1655 | fmt += read; |
1656 | |
1657 | switch (spec.type) { |
1658 | case FORMAT_TYPE_NONE: { |
1659 | int copy = read; |
1660 | if (str < end) { |
1661 | if (copy > end - str) |
1662 | copy = end - str; |
1663 | memcpy(str, old_fmt, copy); |
1664 | } |
1665 | str += read; |
1666 | break; |
1667 | } |
1668 | |
1669 | case FORMAT_TYPE_WIDTH: |
1670 | spec.field_width = get_arg(int); |
1671 | break; |
1672 | |
1673 | case FORMAT_TYPE_PRECISION: |
1674 | spec.precision = get_arg(int); |
1675 | break; |
1676 | |
1677 | case FORMAT_TYPE_CHAR: { |
1678 | char c; |
1679 | |
1680 | if (!(spec.flags & LEFT)) { |
1681 | while (--spec.field_width > 0) { |
1682 | if (str < end) |
1683 | *str = ' '; |
1684 | ++str; |
1685 | } |
1686 | } |
1687 | c = (unsigned char) get_arg(char); |
1688 | if (str < end) |
1689 | *str = c; |
1690 | ++str; |
1691 | while (--spec.field_width > 0) { |
1692 | if (str < end) |
1693 | *str = ' '; |
1694 | ++str; |
1695 | } |
1696 | break; |
1697 | } |
1698 | |
1699 | case FORMAT_TYPE_STR: { |
1700 | const char *str_arg = args; |
1701 | args += strlen(str_arg) + 1; |
1702 | str = string(str, end, (char *)str_arg, spec); |
1703 | break; |
1704 | } |
1705 | |
1706 | case FORMAT_TYPE_PTR: |
1707 | str = pointer(fmt+1, str, end, get_arg(void *), spec); |
1708 | while (isalnum(*fmt)) |
1709 | fmt++; |
1710 | break; |
1711 | |
1712 | case FORMAT_TYPE_PERCENT_CHAR: |
1713 | case FORMAT_TYPE_INVALID: |
1714 | if (str < end) |
1715 | *str = '%'; |
1716 | ++str; |
1717 | break; |
1718 | |
1719 | case FORMAT_TYPE_NRCHARS: |
1720 | /* skip */ |
1721 | break; |
1722 | |
1723 | default: { |
1724 | unsigned long long num; |
1725 | |
1726 | switch (spec.type) { |
1727 | |
1728 | case FORMAT_TYPE_LONG_LONG: |
1729 | num = get_arg(long long); |
1730 | break; |
1731 | case FORMAT_TYPE_ULONG: |
1732 | case FORMAT_TYPE_LONG: |
1733 | num = get_arg(unsigned long); |
1734 | break; |
1735 | case FORMAT_TYPE_SIZE_T: |
1736 | num = get_arg(size_t); |
1737 | break; |
1738 | case FORMAT_TYPE_PTRDIFF: |
1739 | num = get_arg(ptrdiff_t); |
1740 | break; |
1741 | case FORMAT_TYPE_UBYTE: |
1742 | num = get_arg(unsigned char); |
1743 | break; |
1744 | case FORMAT_TYPE_BYTE: |
1745 | num = get_arg(signed char); |
1746 | break; |
1747 | case FORMAT_TYPE_USHORT: |
1748 | num = get_arg(unsigned short); |
1749 | break; |
1750 | case FORMAT_TYPE_SHORT: |
1751 | num = get_arg(short); |
1752 | break; |
1753 | case FORMAT_TYPE_UINT: |
1754 | num = get_arg(unsigned int); |
1755 | break; |
1756 | default: |
1757 | num = get_arg(int); |
1758 | } |
1759 | |
1760 | str = number(str, end, num, spec); |
1761 | } /* default: */ |
1762 | } /* switch(spec.type) */ |
1763 | } /* while(*fmt) */ |
1764 | |
1765 | if (size > 0) { |
1766 | if (str < end) |
1767 | *str = '\0'; |
1768 | else |
1769 | end[-1] = '\0'; |
1770 | } |
1771 | |
1772 | #undef get_arg |
1773 | |
1774 | /* the trailing null byte doesn't count towards the total */ |
1775 | return str - buf; |
1776 | } |
1777 | EXPORT_SYMBOL_GPL(bstr_printf); |
1778 | |
1779 | /** |
1780 | * bprintf - Parse a format string and place args' binary value in a buffer |
1781 | * @bin_buf: The buffer to place args' binary value |
1782 | * @size: The size of the buffer(by words(32bits), not characters) |
1783 | * @fmt: The format string to use |
1784 | * @...: Arguments for the format string |
1785 | * |
1786 | * The function returns the number of words(u32) written |
1787 | * into @bin_buf. |
1788 | */ |
1789 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) |
1790 | { |
1791 | va_list args; |
1792 | int ret; |
1793 | |
1794 | va_start(args, fmt); |
1795 | ret = vbin_printf(bin_buf, size, fmt, args); |
1796 | va_end(args); |
1797 | |
1798 | return ret; |
1799 | } |
1800 | EXPORT_SYMBOL_GPL(bprintf); |
1801 | |
1802 | #endif /* CONFIG_BINARY_PRINTF */ |
1803 | |
1804 | /** |
1805 | * vsscanf - Unformat a buffer into a list of arguments |
1806 | * @buf: input buffer |
1807 | * @fmt: format of buffer |
1808 | * @args: arguments |
1809 | */ |
1810 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1811 | { |
1812 | const char *str = buf; |
1813 | char *next; |
1814 | char digit; |
1815 | int num = 0; |
1816 | u8 qualifier; |
1817 | u8 base; |
1818 | s16 field_width; |
1819 | bool is_sign; |
1820 | |
1821 | while (*fmt && *str) { |
1822 | /* skip any white space in format */ |
1823 | /* white space in format matchs any amount of |
1824 | * white space, including none, in the input. |
1825 | */ |
1826 | if (isspace(*fmt)) { |
1827 | fmt = skip_spaces(++fmt); |
1828 | str = skip_spaces(str); |
1829 | } |
1830 | |
1831 | /* anything that is not a conversion must match exactly */ |
1832 | if (*fmt != '%' && *fmt) { |
1833 | if (*fmt++ != *str++) |
1834 | break; |
1835 | continue; |
1836 | } |
1837 | |
1838 | if (!*fmt) |
1839 | break; |
1840 | ++fmt; |
1841 | |
1842 | /* skip this conversion. |
1843 | * advance both strings to next white space |
1844 | */ |
1845 | if (*fmt == '*') { |
1846 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1847 | fmt++; |
1848 | while (!isspace(*str) && *str) |
1849 | str++; |
1850 | continue; |
1851 | } |
1852 | |
1853 | /* get field width */ |
1854 | field_width = -1; |
1855 | if (isdigit(*fmt)) |
1856 | field_width = skip_atoi(&fmt); |
1857 | |
1858 | /* get conversion qualifier */ |
1859 | qualifier = -1; |
1860 | if (*fmt == 'h' || TOLOWER(*fmt) == 'l' || |
1861 | TOLOWER(*fmt) == 'z') { |
1862 | qualifier = *fmt++; |
1863 | if (unlikely(qualifier == *fmt)) { |
1864 | if (qualifier == 'h') { |
1865 | qualifier = 'H'; |
1866 | fmt++; |
1867 | } else if (qualifier == 'l') { |
1868 | qualifier = 'L'; |
1869 | fmt++; |
1870 | } |
1871 | } |
1872 | } |
1873 | |
1874 | if (!*fmt || !*str) |
1875 | break; |
1876 | |
1877 | base = 10; |
1878 | is_sign = 0; |
1879 | |
1880 | switch (*fmt++) { |
1881 | case 'c': |
1882 | { |
1883 | char *s = (char *)va_arg(args, char*); |
1884 | if (field_width == -1) |
1885 | field_width = 1; |
1886 | do { |
1887 | *s++ = *str++; |
1888 | } while (--field_width > 0 && *str); |
1889 | num++; |
1890 | } |
1891 | continue; |
1892 | case 's': |
1893 | { |
1894 | char *s = (char *)va_arg(args, char *); |
1895 | if (field_width == -1) |
1896 | field_width = SHRT_MAX; |
1897 | /* first, skip leading white space in buffer */ |
1898 | str = skip_spaces(str); |
1899 | |
1900 | /* now copy until next white space */ |
1901 | while (*str && !isspace(*str) && field_width--) |
1902 | *s++ = *str++; |
1903 | *s = '\0'; |
1904 | num++; |
1905 | } |
1906 | continue; |
1907 | case 'n': |
1908 | /* return number of characters read so far */ |
1909 | { |
1910 | int *i = (int *)va_arg(args, int*); |
1911 | *i = str - buf; |
1912 | } |
1913 | continue; |
1914 | case 'o': |
1915 | base = 8; |
1916 | break; |
1917 | case 'x': |
1918 | case 'X': |
1919 | base = 16; |
1920 | break; |
1921 | case 'i': |
1922 | base = 0; |
1923 | case 'd': |
1924 | is_sign = 1; |
1925 | case 'u': |
1926 | break; |
1927 | case '%': |
1928 | /* looking for '%' in str */ |
1929 | if (*str++ != '%') |
1930 | return num; |
1931 | continue; |
1932 | default: |
1933 | /* invalid format; stop here */ |
1934 | return num; |
1935 | } |
1936 | |
1937 | /* have some sort of integer conversion. |
1938 | * first, skip white space in buffer. |
1939 | */ |
1940 | str = skip_spaces(str); |
1941 | |
1942 | digit = *str; |
1943 | if (is_sign && digit == '-') |
1944 | digit = *(str + 1); |
1945 | |
1946 | if (!digit |
1947 | || (base == 16 && !isxdigit(digit)) |
1948 | || (base == 10 && !isdigit(digit)) |
1949 | || (base == 8 && (!isdigit(digit) || digit > '7')) |
1950 | || (base == 0 && !isdigit(digit))) |
1951 | break; |
1952 | |
1953 | switch (qualifier) { |
1954 | case 'H': /* that's 'hh' in format */ |
1955 | if (is_sign) { |
1956 | signed char *s = (signed char *)va_arg(args, signed char *); |
1957 | *s = (signed char)simple_strtol(str, &next, base); |
1958 | } else { |
1959 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
1960 | *s = (unsigned char)simple_strtoul(str, &next, base); |
1961 | } |
1962 | break; |
1963 | case 'h': |
1964 | if (is_sign) { |
1965 | short *s = (short *)va_arg(args, short *); |
1966 | *s = (short)simple_strtol(str, &next, base); |
1967 | } else { |
1968 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
1969 | *s = (unsigned short)simple_strtoul(str, &next, base); |
1970 | } |
1971 | break; |
1972 | case 'l': |
1973 | if (is_sign) { |
1974 | long *l = (long *)va_arg(args, long *); |
1975 | *l = simple_strtol(str, &next, base); |
1976 | } else { |
1977 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
1978 | *l = simple_strtoul(str, &next, base); |
1979 | } |
1980 | break; |
1981 | case 'L': |
1982 | if (is_sign) { |
1983 | long long *l = (long long *)va_arg(args, long long *); |
1984 | *l = simple_strtoll(str, &next, base); |
1985 | } else { |
1986 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
1987 | *l = simple_strtoull(str, &next, base); |
1988 | } |
1989 | break; |
1990 | case 'Z': |
1991 | case 'z': |
1992 | { |
1993 | size_t *s = (size_t *)va_arg(args, size_t *); |
1994 | *s = (size_t)simple_strtoul(str, &next, base); |
1995 | } |
1996 | break; |
1997 | default: |
1998 | if (is_sign) { |
1999 | int *i = (int *)va_arg(args, int *); |
2000 | *i = (int)simple_strtol(str, &next, base); |
2001 | } else { |
2002 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2003 | *i = (unsigned int)simple_strtoul(str, &next, base); |
2004 | } |
2005 | break; |
2006 | } |
2007 | num++; |
2008 | |
2009 | if (!next) |
2010 | break; |
2011 | str = next; |
2012 | } |
2013 | |
2014 | /* |
2015 | * Now we've come all the way through so either the input string or the |
2016 | * format ended. In the former case, there can be a %n at the current |
2017 | * position in the format that needs to be filled. |
2018 | */ |
2019 | if (*fmt == '%' && *(fmt + 1) == 'n') { |
2020 | int *p = (int *)va_arg(args, int *); |
2021 | *p = str - buf; |
2022 | } |
2023 | |
2024 | return num; |
2025 | } |
2026 | EXPORT_SYMBOL(vsscanf); |
2027 | |
2028 | /** |
2029 | * sscanf - Unformat a buffer into a list of arguments |
2030 | * @buf: input buffer |
2031 | * @fmt: formatting of buffer |
2032 | * @...: resulting arguments |
2033 | */ |
2034 | int sscanf(const char *buf, const char *fmt, ...) |
2035 | { |
2036 | va_list args; |
2037 | int i; |
2038 | |
2039 | va_start(args, fmt); |
2040 | i = vsscanf(buf, fmt, args); |
2041 | va_end(args); |
2042 | |
2043 | return i; |
2044 | } |
2045 | EXPORT_SYMBOL(sscanf); |
2046 |
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v2.6.34-rc5
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