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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> /* for KSYM_SYMBOL_LEN */ |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> |
23 | #include <linux/ctype.h> |
24 | #include <linux/kernel.h> |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/math64.h> |
27 | #include <linux/uaccess.h> |
28 | #include <linux/ioport.h> |
29 | #include <net/addrconf.h> |
30 | |
31 | #include <asm/page.h> /* for PAGE_SIZE */ |
32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
33 | |
34 | #include "kstrtox.h" |
35 | |
36 | /** |
37 | * simple_strtoull - convert a string to an unsigned long long |
38 | * @cp: The start of the string |
39 | * @endp: A pointer to the end of the parsed string will be placed here |
40 | * @base: The number base to use |
41 | * |
42 | * This function is obsolete. Please use kstrtoull instead. |
43 | */ |
44 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
45 | { |
46 | unsigned long long result; |
47 | unsigned int rv; |
48 | |
49 | cp = _parse_integer_fixup_radix(cp, &base); |
50 | rv = _parse_integer(cp, base, &result); |
51 | /* FIXME */ |
52 | cp += (rv & ~KSTRTOX_OVERFLOW); |
53 | |
54 | if (endp) |
55 | *endp = (char *)cp; |
56 | |
57 | return result; |
58 | } |
59 | EXPORT_SYMBOL(simple_strtoull); |
60 | |
61 | /** |
62 | * simple_strtoul - convert a string to an unsigned long |
63 | * @cp: The start of the string |
64 | * @endp: A pointer to the end of the parsed string will be placed here |
65 | * @base: The number base to use |
66 | * |
67 | * This function is obsolete. Please use kstrtoul instead. |
68 | */ |
69 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
70 | { |
71 | return simple_strtoull(cp, endp, base); |
72 | } |
73 | EXPORT_SYMBOL(simple_strtoul); |
74 | |
75 | /** |
76 | * simple_strtol - convert a string to a signed long |
77 | * @cp: The start of the string |
78 | * @endp: A pointer to the end of the parsed string will be placed here |
79 | * @base: The number base to use |
80 | * |
81 | * This function is obsolete. Please use kstrtol instead. |
82 | */ |
83 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
84 | { |
85 | if (*cp == '-') |
86 | return -simple_strtoul(cp + 1, endp, base); |
87 | |
88 | return simple_strtoul(cp, endp, base); |
89 | } |
90 | EXPORT_SYMBOL(simple_strtol); |
91 | |
92 | /** |
93 | * simple_strtoll - convert a string to a signed long long |
94 | * @cp: The start of the string |
95 | * @endp: A pointer to the end of the parsed string will be placed here |
96 | * @base: The number base to use |
97 | * |
98 | * This function is obsolete. Please use kstrtoll instead. |
99 | */ |
100 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
101 | { |
102 | if (*cp == '-') |
103 | return -simple_strtoull(cp + 1, endp, base); |
104 | |
105 | return simple_strtoull(cp, endp, base); |
106 | } |
107 | EXPORT_SYMBOL(simple_strtoll); |
108 | |
109 | static noinline_for_stack |
110 | int skip_atoi(const char **s) |
111 | { |
112 | int i = 0; |
113 | |
114 | while (isdigit(**s)) |
115 | i = i*10 + *((*s)++) - '0'; |
116 | |
117 | return i; |
118 | } |
119 | |
120 | /* Decimal conversion is by far the most typical, and is used |
121 | * for /proc and /sys data. This directly impacts e.g. top performance |
122 | * with many processes running. We optimize it for speed |
123 | * using ideas described at <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
124 | * (with permission from the author, Douglas W. Jones). |
125 | */ |
126 | |
127 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
128 | /* Formats correctly any integer in [0, 999999999] */ |
129 | static noinline_for_stack |
130 | char *put_dec_full9(char *buf, unsigned q) |
131 | { |
132 | unsigned r; |
133 | |
134 | /* |
135 | * Possible ways to approx. divide by 10 |
136 | * (x * 0x1999999a) >> 32 x < 1073741829 (multiply must be 64-bit) |
137 | * (x * 0xcccd) >> 19 x < 81920 (x < 262149 when 64-bit mul) |
138 | * (x * 0x6667) >> 18 x < 43699 |
139 | * (x * 0x3334) >> 17 x < 16389 |
140 | * (x * 0x199a) >> 16 x < 16389 |
141 | * (x * 0x0ccd) >> 15 x < 16389 |
142 | * (x * 0x0667) >> 14 x < 2739 |
143 | * (x * 0x0334) >> 13 x < 1029 |
144 | * (x * 0x019a) >> 12 x < 1029 |
145 | * (x * 0x00cd) >> 11 x < 1029 shorter code than * 0x67 (on i386) |
146 | * (x * 0x0067) >> 10 x < 179 |
147 | * (x * 0x0034) >> 9 x < 69 same |
148 | * (x * 0x001a) >> 8 x < 69 same |
149 | * (x * 0x000d) >> 7 x < 69 same, shortest code (on i386) |
150 | * (x * 0x0007) >> 6 x < 19 |
151 | * See <http://www.cs.uiowa.edu/~jones/bcd/divide.html> |
152 | */ |
153 | r = (q * (uint64_t)0x1999999a) >> 32; |
154 | *buf++ = (q - 10 * r) + '0'; /* 1 */ |
155 | q = (r * (uint64_t)0x1999999a) >> 32; |
156 | *buf++ = (r - 10 * q) + '0'; /* 2 */ |
157 | r = (q * (uint64_t)0x1999999a) >> 32; |
158 | *buf++ = (q - 10 * r) + '0'; /* 3 */ |
159 | q = (r * (uint64_t)0x1999999a) >> 32; |
160 | *buf++ = (r - 10 * q) + '0'; /* 4 */ |
161 | r = (q * (uint64_t)0x1999999a) >> 32; |
162 | *buf++ = (q - 10 * r) + '0'; /* 5 */ |
163 | /* Now value is under 10000, can avoid 64-bit multiply */ |
164 | q = (r * 0x199a) >> 16; |
165 | *buf++ = (r - 10 * q) + '0'; /* 6 */ |
166 | r = (q * 0xcd) >> 11; |
167 | *buf++ = (q - 10 * r) + '0'; /* 7 */ |
168 | q = (r * 0xcd) >> 11; |
169 | *buf++ = (r - 10 * q) + '0'; /* 8 */ |
170 | *buf++ = q + '0'; /* 9 */ |
171 | return buf; |
172 | } |
173 | #endif |
174 | |
175 | /* Similar to above but do not pad with zeros. |
176 | * Code can be easily arranged to print 9 digits too, but our callers |
177 | * always call put_dec_full9() instead when the number has 9 decimal digits. |
178 | */ |
179 | static noinline_for_stack |
180 | char *put_dec_trunc8(char *buf, unsigned r) |
181 | { |
182 | unsigned q; |
183 | |
184 | /* Copy of previous function's body with added early returns */ |
185 | while (r >= 10000) { |
186 | q = r + '0'; |
187 | r = (r * (uint64_t)0x1999999a) >> 32; |
188 | *buf++ = q - 10*r; |
189 | } |
190 | |
191 | q = (r * 0x199a) >> 16; /* r <= 9999 */ |
192 | *buf++ = (r - 10 * q) + '0'; |
193 | if (q == 0) |
194 | return buf; |
195 | r = (q * 0xcd) >> 11; /* q <= 999 */ |
196 | *buf++ = (q - 10 * r) + '0'; |
197 | if (r == 0) |
198 | return buf; |
199 | q = (r * 0xcd) >> 11; /* r <= 99 */ |
200 | *buf++ = (r - 10 * q) + '0'; |
201 | if (q == 0) |
202 | return buf; |
203 | *buf++ = q + '0'; /* q <= 9 */ |
204 | return buf; |
205 | } |
206 | |
207 | /* There are two algorithms to print larger numbers. |
208 | * One is generic: divide by 1000000000 and repeatedly print |
209 | * groups of (up to) 9 digits. It's conceptually simple, |
210 | * but requires a (unsigned long long) / 1000000000 division. |
211 | * |
212 | * Second algorithm splits 64-bit unsigned long long into 16-bit chunks, |
213 | * manipulates them cleverly and generates groups of 4 decimal digits. |
214 | * It so happens that it does NOT require long long division. |
215 | * |
216 | * If long is > 32 bits, division of 64-bit values is relatively easy, |
217 | * and we will use the first algorithm. |
218 | * If long long is > 64 bits (strange architecture with VERY large long long), |
219 | * second algorithm can't be used, and we again use the first one. |
220 | * |
221 | * Else (if long is 32 bits and long long is 64 bits) we use second one. |
222 | */ |
223 | |
224 | #if BITS_PER_LONG != 32 || BITS_PER_LONG_LONG != 64 |
225 | |
226 | /* First algorithm: generic */ |
227 | |
228 | static |
229 | char *put_dec(char *buf, unsigned long long n) |
230 | { |
231 | if (n >= 100*1000*1000) { |
232 | while (n >= 1000*1000*1000) |
233 | buf = put_dec_full9(buf, do_div(n, 1000*1000*1000)); |
234 | if (n >= 100*1000*1000) |
235 | return put_dec_full9(buf, n); |
236 | } |
237 | return put_dec_trunc8(buf, n); |
238 | } |
239 | |
240 | #else |
241 | |
242 | /* Second algorithm: valid only for 64-bit long longs */ |
243 | |
244 | /* See comment in put_dec_full9 for choice of constants */ |
245 | static noinline_for_stack |
246 | void put_dec_full4(char *buf, unsigned q) |
247 | { |
248 | unsigned r; |
249 | r = (q * 0xccd) >> 15; |
250 | buf[0] = (q - 10 * r) + '0'; |
251 | q = (r * 0xcd) >> 11; |
252 | buf[1] = (r - 10 * q) + '0'; |
253 | r = (q * 0xcd) >> 11; |
254 | buf[2] = (q - 10 * r) + '0'; |
255 | buf[3] = r + '0'; |
256 | } |
257 | |
258 | /* |
259 | * Call put_dec_full4 on x % 10000, return x / 10000. |
260 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 |
261 | * holds for all x < 1,128,869,999. The largest value this |
262 | * helper will ever be asked to convert is 1,125,520,955. |
263 | * (d1 in the put_dec code, assuming n is all-ones). |
264 | */ |
265 | static |
266 | unsigned put_dec_helper4(char *buf, unsigned x) |
267 | { |
268 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; |
269 | |
270 | put_dec_full4(buf, x - q * 10000); |
271 | return q; |
272 | } |
273 | |
274 | /* Based on code by Douglas W. Jones found at |
275 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> |
276 | * (with permission from the author). |
277 | * Performs no 64-bit division and hence should be fast on 32-bit machines. |
278 | */ |
279 | static |
280 | char *put_dec(char *buf, unsigned long long n) |
281 | { |
282 | uint32_t d3, d2, d1, q, h; |
283 | |
284 | if (n < 100*1000*1000) |
285 | return put_dec_trunc8(buf, n); |
286 | |
287 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ |
288 | h = (n >> 32); |
289 | d2 = (h ) & 0xffff; |
290 | d3 = (h >> 16); /* implicit "& 0xffff" */ |
291 | |
292 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
293 | q = put_dec_helper4(buf, q); |
294 | |
295 | q += 7671 * d3 + 9496 * d2 + 6 * d1; |
296 | q = put_dec_helper4(buf+4, q); |
297 | |
298 | q += 4749 * d3 + 42 * d2; |
299 | q = put_dec_helper4(buf+8, q); |
300 | |
301 | q += 281 * d3; |
302 | buf += 12; |
303 | if (q) |
304 | buf = put_dec_trunc8(buf, q); |
305 | else while (buf[-1] == '0') |
306 | --buf; |
307 | |
308 | return buf; |
309 | } |
310 | |
311 | #endif |
312 | |
313 | /* |
314 | * Convert passed number to decimal string. |
315 | * Returns the length of string. On buffer overflow, returns 0. |
316 | * |
317 | * If speed is not important, use snprintf(). It's easy to read the code. |
318 | */ |
319 | int num_to_str(char *buf, int size, unsigned long long num) |
320 | { |
321 | char tmp[sizeof(num) * 3]; |
322 | int idx, len; |
323 | |
324 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
325 | if (num <= 9) { |
326 | tmp[0] = '0' + num; |
327 | len = 1; |
328 | } else { |
329 | len = put_dec(tmp, num) - tmp; |
330 | } |
331 | |
332 | if (len > size) |
333 | return 0; |
334 | for (idx = 0; idx < len; ++idx) |
335 | buf[idx] = tmp[len - idx - 1]; |
336 | return len; |
337 | } |
338 | |
339 | #define ZEROPAD 1 /* pad with zero */ |
340 | #define SIGN 2 /* unsigned/signed long */ |
341 | #define PLUS 4 /* show plus */ |
342 | #define SPACE 8 /* space if plus */ |
343 | #define LEFT 16 /* left justified */ |
344 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
345 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ |
346 | |
347 | enum format_type { |
348 | FORMAT_TYPE_NONE, /* Just a string part */ |
349 | FORMAT_TYPE_WIDTH, |
350 | FORMAT_TYPE_PRECISION, |
351 | FORMAT_TYPE_CHAR, |
352 | FORMAT_TYPE_STR, |
353 | FORMAT_TYPE_PTR, |
354 | FORMAT_TYPE_PERCENT_CHAR, |
355 | FORMAT_TYPE_INVALID, |
356 | FORMAT_TYPE_LONG_LONG, |
357 | FORMAT_TYPE_ULONG, |
358 | FORMAT_TYPE_LONG, |
359 | FORMAT_TYPE_UBYTE, |
360 | FORMAT_TYPE_BYTE, |
361 | FORMAT_TYPE_USHORT, |
362 | FORMAT_TYPE_SHORT, |
363 | FORMAT_TYPE_UINT, |
364 | FORMAT_TYPE_INT, |
365 | FORMAT_TYPE_NRCHARS, |
366 | FORMAT_TYPE_SIZE_T, |
367 | FORMAT_TYPE_PTRDIFF |
368 | }; |
369 | |
370 | struct printf_spec { |
371 | u8 type; /* format_type enum */ |
372 | u8 flags; /* flags to number() */ |
373 | u8 base; /* number base, 8, 10 or 16 only */ |
374 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ |
375 | s16 field_width; /* width of output field */ |
376 | s16 precision; /* # of digits/chars */ |
377 | }; |
378 | |
379 | static noinline_for_stack |
380 | char *number(char *buf, char *end, unsigned long long num, |
381 | struct printf_spec spec) |
382 | { |
383 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
384 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
385 | |
386 | char tmp[66]; |
387 | char sign; |
388 | char locase; |
389 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
390 | int i; |
391 | bool is_zero = num == 0LL; |
392 | |
393 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
394 | * produces same digits or (maybe lowercased) letters */ |
395 | locase = (spec.flags & SMALL); |
396 | if (spec.flags & LEFT) |
397 | spec.flags &= ~ZEROPAD; |
398 | sign = 0; |
399 | if (spec.flags & SIGN) { |
400 | if ((signed long long)num < 0) { |
401 | sign = '-'; |
402 | num = -(signed long long)num; |
403 | spec.field_width--; |
404 | } else if (spec.flags & PLUS) { |
405 | sign = '+'; |
406 | spec.field_width--; |
407 | } else if (spec.flags & SPACE) { |
408 | sign = ' '; |
409 | spec.field_width--; |
410 | } |
411 | } |
412 | if (need_pfx) { |
413 | if (spec.base == 16) |
414 | spec.field_width -= 2; |
415 | else if (!is_zero) |
416 | spec.field_width--; |
417 | } |
418 | |
419 | /* generate full string in tmp[], in reverse order */ |
420 | i = 0; |
421 | if (num < spec.base) |
422 | tmp[i++] = digits[num] | locase; |
423 | /* Generic code, for any base: |
424 | else do { |
425 | tmp[i++] = (digits[do_div(num,base)] | locase); |
426 | } while (num != 0); |
427 | */ |
428 | else if (spec.base != 10) { /* 8 or 16 */ |
429 | int mask = spec.base - 1; |
430 | int shift = 3; |
431 | |
432 | if (spec.base == 16) |
433 | shift = 4; |
434 | do { |
435 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
436 | num >>= shift; |
437 | } while (num); |
438 | } else { /* base 10 */ |
439 | i = put_dec(tmp, num) - tmp; |
440 | } |
441 | |
442 | /* printing 100 using %2d gives "100", not "00" */ |
443 | if (i > spec.precision) |
444 | spec.precision = i; |
445 | /* leading space padding */ |
446 | spec.field_width -= spec.precision; |
447 | if (!(spec.flags & (ZEROPAD+LEFT))) { |
448 | while (--spec.field_width >= 0) { |
449 | if (buf < end) |
450 | *buf = ' '; |
451 | ++buf; |
452 | } |
453 | } |
454 | /* sign */ |
455 | if (sign) { |
456 | if (buf < end) |
457 | *buf = sign; |
458 | ++buf; |
459 | } |
460 | /* "0x" / "0" prefix */ |
461 | if (need_pfx) { |
462 | if (spec.base == 16 || !is_zero) { |
463 | if (buf < end) |
464 | *buf = '0'; |
465 | ++buf; |
466 | } |
467 | if (spec.base == 16) { |
468 | if (buf < end) |
469 | *buf = ('X' | locase); |
470 | ++buf; |
471 | } |
472 | } |
473 | /* zero or space padding */ |
474 | if (!(spec.flags & LEFT)) { |
475 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; |
476 | while (--spec.field_width >= 0) { |
477 | if (buf < end) |
478 | *buf = c; |
479 | ++buf; |
480 | } |
481 | } |
482 | /* hmm even more zero padding? */ |
483 | while (i <= --spec.precision) { |
484 | if (buf < end) |
485 | *buf = '0'; |
486 | ++buf; |
487 | } |
488 | /* actual digits of result */ |
489 | while (--i >= 0) { |
490 | if (buf < end) |
491 | *buf = tmp[i]; |
492 | ++buf; |
493 | } |
494 | /* trailing space padding */ |
495 | while (--spec.field_width >= 0) { |
496 | if (buf < end) |
497 | *buf = ' '; |
498 | ++buf; |
499 | } |
500 | |
501 | return buf; |
502 | } |
503 | |
504 | static noinline_for_stack |
505 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) |
506 | { |
507 | int len, i; |
508 | |
509 | if ((unsigned long)s < PAGE_SIZE) |
510 | s = "(null)"; |
511 | |
512 | len = strnlen(s, spec.precision); |
513 | |
514 | if (!(spec.flags & LEFT)) { |
515 | while (len < spec.field_width--) { |
516 | if (buf < end) |
517 | *buf = ' '; |
518 | ++buf; |
519 | } |
520 | } |
521 | for (i = 0; i < len; ++i) { |
522 | if (buf < end) |
523 | *buf = *s; |
524 | ++buf; ++s; |
525 | } |
526 | while (len < spec.field_width--) { |
527 | if (buf < end) |
528 | *buf = ' '; |
529 | ++buf; |
530 | } |
531 | |
532 | return buf; |
533 | } |
534 | |
535 | static noinline_for_stack |
536 | char *symbol_string(char *buf, char *end, void *ptr, |
537 | struct printf_spec spec, char ext) |
538 | { |
539 | unsigned long value = (unsigned long) ptr; |
540 | #ifdef CONFIG_KALLSYMS |
541 | char sym[KSYM_SYMBOL_LEN]; |
542 | if (ext == 'B') |
543 | sprint_backtrace(sym, value); |
544 | else if (ext != 'f' && ext != 's') |
545 | sprint_symbol(sym, value); |
546 | else |
547 | sprint_symbol_no_offset(sym, value); |
548 | |
549 | return string(buf, end, sym, spec); |
550 | #else |
551 | spec.field_width = 2 * sizeof(void *); |
552 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
553 | spec.base = 16; |
554 | |
555 | return number(buf, end, value, spec); |
556 | #endif |
557 | } |
558 | |
559 | static noinline_for_stack |
560 | char *resource_string(char *buf, char *end, struct resource *res, |
561 | struct printf_spec spec, const char *fmt) |
562 | { |
563 | #ifndef IO_RSRC_PRINTK_SIZE |
564 | #define IO_RSRC_PRINTK_SIZE 6 |
565 | #endif |
566 | |
567 | #ifndef MEM_RSRC_PRINTK_SIZE |
568 | #define MEM_RSRC_PRINTK_SIZE 10 |
569 | #endif |
570 | static const struct printf_spec io_spec = { |
571 | .base = 16, |
572 | .field_width = IO_RSRC_PRINTK_SIZE, |
573 | .precision = -1, |
574 | .flags = SPECIAL | SMALL | ZEROPAD, |
575 | }; |
576 | static const struct printf_spec mem_spec = { |
577 | .base = 16, |
578 | .field_width = MEM_RSRC_PRINTK_SIZE, |
579 | .precision = -1, |
580 | .flags = SPECIAL | SMALL | ZEROPAD, |
581 | }; |
582 | static const struct printf_spec bus_spec = { |
583 | .base = 16, |
584 | .field_width = 2, |
585 | .precision = -1, |
586 | .flags = SMALL | ZEROPAD, |
587 | }; |
588 | static const struct printf_spec dec_spec = { |
589 | .base = 10, |
590 | .precision = -1, |
591 | .flags = 0, |
592 | }; |
593 | static const struct printf_spec str_spec = { |
594 | .field_width = -1, |
595 | .precision = 10, |
596 | .flags = LEFT, |
597 | }; |
598 | static const struct printf_spec flag_spec = { |
599 | .base = 16, |
600 | .precision = -1, |
601 | .flags = SPECIAL | SMALL, |
602 | }; |
603 | |
604 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) |
605 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ |
606 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) |
607 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) |
608 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
609 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
610 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, |
611 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; |
612 | |
613 | char *p = sym, *pend = sym + sizeof(sym); |
614 | int decode = (fmt[0] == 'R') ? 1 : 0; |
615 | const struct printf_spec *specp; |
616 | |
617 | *p++ = '['; |
618 | if (res->flags & IORESOURCE_IO) { |
619 | p = string(p, pend, "io ", str_spec); |
620 | specp = &io_spec; |
621 | } else if (res->flags & IORESOURCE_MEM) { |
622 | p = string(p, pend, "mem ", str_spec); |
623 | specp = &mem_spec; |
624 | } else if (res->flags & IORESOURCE_IRQ) { |
625 | p = string(p, pend, "irq ", str_spec); |
626 | specp = &dec_spec; |
627 | } else if (res->flags & IORESOURCE_DMA) { |
628 | p = string(p, pend, "dma ", str_spec); |
629 | specp = &dec_spec; |
630 | } else if (res->flags & IORESOURCE_BUS) { |
631 | p = string(p, pend, "bus ", str_spec); |
632 | specp = &bus_spec; |
633 | } else { |
634 | p = string(p, pend, "??? ", str_spec); |
635 | specp = &mem_spec; |
636 | decode = 0; |
637 | } |
638 | p = number(p, pend, res->start, *specp); |
639 | if (res->start != res->end) { |
640 | *p++ = '-'; |
641 | p = number(p, pend, res->end, *specp); |
642 | } |
643 | if (decode) { |
644 | if (res->flags & IORESOURCE_MEM_64) |
645 | p = string(p, pend, " 64bit", str_spec); |
646 | if (res->flags & IORESOURCE_PREFETCH) |
647 | p = string(p, pend, " pref", str_spec); |
648 | if (res->flags & IORESOURCE_WINDOW) |
649 | p = string(p, pend, " window", str_spec); |
650 | if (res->flags & IORESOURCE_DISABLED) |
651 | p = string(p, pend, " disabled", str_spec); |
652 | } else { |
653 | p = string(p, pend, " flags ", str_spec); |
654 | p = number(p, pend, res->flags, flag_spec); |
655 | } |
656 | *p++ = ']'; |
657 | *p = '\0'; |
658 | |
659 | return string(buf, end, sym, spec); |
660 | } |
661 | |
662 | static noinline_for_stack |
663 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, |
664 | const char *fmt) |
665 | { |
666 | int i, len = 1; /* if we pass '%ph[CDN]', field witdh remains |
667 | negative value, fallback to the default */ |
668 | char separator; |
669 | |
670 | if (spec.field_width == 0) |
671 | /* nothing to print */ |
672 | return buf; |
673 | |
674 | if (ZERO_OR_NULL_PTR(addr)) |
675 | /* NULL pointer */ |
676 | return string(buf, end, NULL, spec); |
677 | |
678 | switch (fmt[1]) { |
679 | case 'C': |
680 | separator = ':'; |
681 | break; |
682 | case 'D': |
683 | separator = '-'; |
684 | break; |
685 | case 'N': |
686 | separator = 0; |
687 | break; |
688 | default: |
689 | separator = ' '; |
690 | break; |
691 | } |
692 | |
693 | if (spec.field_width > 0) |
694 | len = min_t(int, spec.field_width, 64); |
695 | |
696 | for (i = 0; i < len && buf < end - 1; i++) { |
697 | buf = hex_byte_pack(buf, addr[i]); |
698 | |
699 | if (buf < end && separator && i != len - 1) |
700 | *buf++ = separator; |
701 | } |
702 | |
703 | return buf; |
704 | } |
705 | |
706 | static noinline_for_stack |
707 | char *mac_address_string(char *buf, char *end, u8 *addr, |
708 | struct printf_spec spec, const char *fmt) |
709 | { |
710 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
711 | char *p = mac_addr; |
712 | int i; |
713 | char separator; |
714 | bool reversed = false; |
715 | |
716 | switch (fmt[1]) { |
717 | case 'F': |
718 | separator = '-'; |
719 | break; |
720 | |
721 | case 'R': |
722 | reversed = true; |
723 | /* fall through */ |
724 | |
725 | default: |
726 | separator = ':'; |
727 | break; |
728 | } |
729 | |
730 | for (i = 0; i < 6; i++) { |
731 | if (reversed) |
732 | p = hex_byte_pack(p, addr[5 - i]); |
733 | else |
734 | p = hex_byte_pack(p, addr[i]); |
735 | |
736 | if (fmt[0] == 'M' && i != 5) |
737 | *p++ = separator; |
738 | } |
739 | *p = '\0'; |
740 | |
741 | return string(buf, end, mac_addr, spec); |
742 | } |
743 | |
744 | static noinline_for_stack |
745 | char *ip4_string(char *p, const u8 *addr, const char *fmt) |
746 | { |
747 | int i; |
748 | bool leading_zeros = (fmt[0] == 'i'); |
749 | int index; |
750 | int step; |
751 | |
752 | switch (fmt[2]) { |
753 | case 'h': |
754 | #ifdef __BIG_ENDIAN |
755 | index = 0; |
756 | step = 1; |
757 | #else |
758 | index = 3; |
759 | step = -1; |
760 | #endif |
761 | break; |
762 | case 'l': |
763 | index = 3; |
764 | step = -1; |
765 | break; |
766 | case 'n': |
767 | case 'b': |
768 | default: |
769 | index = 0; |
770 | step = 1; |
771 | break; |
772 | } |
773 | for (i = 0; i < 4; i++) { |
774 | char temp[3]; /* hold each IP quad in reverse order */ |
775 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
776 | if (leading_zeros) { |
777 | if (digits < 3) |
778 | *p++ = '0'; |
779 | if (digits < 2) |
780 | *p++ = '0'; |
781 | } |
782 | /* reverse the digits in the quad */ |
783 | while (digits--) |
784 | *p++ = temp[digits]; |
785 | if (i < 3) |
786 | *p++ = '.'; |
787 | index += step; |
788 | } |
789 | *p = '\0'; |
790 | |
791 | return p; |
792 | } |
793 | |
794 | static noinline_for_stack |
795 | char *ip6_compressed_string(char *p, const char *addr) |
796 | { |
797 | int i, j, range; |
798 | unsigned char zerolength[8]; |
799 | int longest = 1; |
800 | int colonpos = -1; |
801 | u16 word; |
802 | u8 hi, lo; |
803 | bool needcolon = false; |
804 | bool useIPv4; |
805 | struct in6_addr in6; |
806 | |
807 | memcpy(&in6, addr, sizeof(struct in6_addr)); |
808 | |
809 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); |
810 | |
811 | memset(zerolength, 0, sizeof(zerolength)); |
812 | |
813 | if (useIPv4) |
814 | range = 6; |
815 | else |
816 | range = 8; |
817 | |
818 | /* find position of longest 0 run */ |
819 | for (i = 0; i < range; i++) { |
820 | for (j = i; j < range; j++) { |
821 | if (in6.s6_addr16[j] != 0) |
822 | break; |
823 | zerolength[i]++; |
824 | } |
825 | } |
826 | for (i = 0; i < range; i++) { |
827 | if (zerolength[i] > longest) { |
828 | longest = zerolength[i]; |
829 | colonpos = i; |
830 | } |
831 | } |
832 | if (longest == 1) /* don't compress a single 0 */ |
833 | colonpos = -1; |
834 | |
835 | /* emit address */ |
836 | for (i = 0; i < range; i++) { |
837 | if (i == colonpos) { |
838 | if (needcolon || i == 0) |
839 | *p++ = ':'; |
840 | *p++ = ':'; |
841 | needcolon = false; |
842 | i += longest - 1; |
843 | continue; |
844 | } |
845 | if (needcolon) { |
846 | *p++ = ':'; |
847 | needcolon = false; |
848 | } |
849 | /* hex u16 without leading 0s */ |
850 | word = ntohs(in6.s6_addr16[i]); |
851 | hi = word >> 8; |
852 | lo = word & 0xff; |
853 | if (hi) { |
854 | if (hi > 0x0f) |
855 | p = hex_byte_pack(p, hi); |
856 | else |
857 | *p++ = hex_asc_lo(hi); |
858 | p = hex_byte_pack(p, lo); |
859 | } |
860 | else if (lo > 0x0f) |
861 | p = hex_byte_pack(p, lo); |
862 | else |
863 | *p++ = hex_asc_lo(lo); |
864 | needcolon = true; |
865 | } |
866 | |
867 | if (useIPv4) { |
868 | if (needcolon) |
869 | *p++ = ':'; |
870 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
871 | } |
872 | *p = '\0'; |
873 | |
874 | return p; |
875 | } |
876 | |
877 | static noinline_for_stack |
878 | char *ip6_string(char *p, const char *addr, const char *fmt) |
879 | { |
880 | int i; |
881 | |
882 | for (i = 0; i < 8; i++) { |
883 | p = hex_byte_pack(p, *addr++); |
884 | p = hex_byte_pack(p, *addr++); |
885 | if (fmt[0] == 'I' && i != 7) |
886 | *p++ = ':'; |
887 | } |
888 | *p = '\0'; |
889 | |
890 | return p; |
891 | } |
892 | |
893 | static noinline_for_stack |
894 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, |
895 | struct printf_spec spec, const char *fmt) |
896 | { |
897 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; |
898 | |
899 | if (fmt[0] == 'I' && fmt[2] == 'c') |
900 | ip6_compressed_string(ip6_addr, addr); |
901 | else |
902 | ip6_string(ip6_addr, addr, fmt); |
903 | |
904 | return string(buf, end, ip6_addr, spec); |
905 | } |
906 | |
907 | static noinline_for_stack |
908 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, |
909 | struct printf_spec spec, const char *fmt) |
910 | { |
911 | char ip4_addr[sizeof("255.255.255.255")]; |
912 | |
913 | ip4_string(ip4_addr, addr, fmt); |
914 | |
915 | return string(buf, end, ip4_addr, spec); |
916 | } |
917 | |
918 | static noinline_for_stack |
919 | char *uuid_string(char *buf, char *end, const u8 *addr, |
920 | struct printf_spec spec, const char *fmt) |
921 | { |
922 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; |
923 | char *p = uuid; |
924 | int i; |
925 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; |
926 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; |
927 | const u8 *index = be; |
928 | bool uc = false; |
929 | |
930 | switch (*(++fmt)) { |
931 | case 'L': |
932 | uc = true; /* fall-through */ |
933 | case 'l': |
934 | index = le; |
935 | break; |
936 | case 'B': |
937 | uc = true; |
938 | break; |
939 | } |
940 | |
941 | for (i = 0; i < 16; i++) { |
942 | p = hex_byte_pack(p, addr[index[i]]); |
943 | switch (i) { |
944 | case 3: |
945 | case 5: |
946 | case 7: |
947 | case 9: |
948 | *p++ = '-'; |
949 | break; |
950 | } |
951 | } |
952 | |
953 | *p = 0; |
954 | |
955 | if (uc) { |
956 | p = uuid; |
957 | do { |
958 | *p = toupper(*p); |
959 | } while (*(++p)); |
960 | } |
961 | |
962 | return string(buf, end, uuid, spec); |
963 | } |
964 | |
965 | static |
966 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, |
967 | struct printf_spec spec) |
968 | { |
969 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
970 | if (spec.field_width == -1) |
971 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); |
972 | spec.base = 16; |
973 | |
974 | return number(buf, end, *(const netdev_features_t *)addr, spec); |
975 | } |
976 | |
977 | int kptr_restrict __read_mostly; |
978 | |
979 | /* |
980 | * Show a '%p' thing. A kernel extension is that the '%p' is followed |
981 | * by an extra set of alphanumeric characters that are extended format |
982 | * specifiers. |
983 | * |
984 | * Right now we handle: |
985 | * |
986 | * - 'F' For symbolic function descriptor pointers with offset |
987 | * - 'f' For simple symbolic function names without offset |
988 | * - 'S' For symbolic direct pointers with offset |
989 | * - 's' For symbolic direct pointers without offset |
990 | * - 'B' For backtraced symbolic direct pointers with offset |
991 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
992 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] |
993 | * - 'M' For a 6-byte MAC address, it prints the address in the |
994 | * usual colon-separated hex notation |
995 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
996 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
997 | * with a dash-separated hex notation |
998 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
999 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1000 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) |
1001 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's |
1002 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1003 | * IPv6 omits the colons (01020304...0f) |
1004 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) |
1005 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
1006 | * - 'I6c' for IPv6 addresses printed as specified by |
1007 | * http://tools.ietf.org/html/rfc5952 |
1008 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1009 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" |
1010 | * Options for %pU are: |
1011 | * b big endian lower case hex (default) |
1012 | * B big endian UPPER case hex |
1013 | * l little endian lower case hex |
1014 | * L little endian UPPER case hex |
1015 | * big endian output byte order is: |
1016 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] |
1017 | * little endian output byte order is: |
1018 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] |
1019 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1020 | * call vsnprintf(->format, *->va_list). |
1021 | * Implements a "recursive vsnprintf". |
1022 | * Do not use this feature without some mechanism to verify the |
1023 | * correctness of the format string and va_list arguments. |
1024 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
1025 | * - 'NF' For a netdev_features_t |
1026 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1027 | * a certain separator (' ' by default): |
1028 | * C colon |
1029 | * D dash |
1030 | * N no separator |
1031 | * The maximum supported length is 64 bytes of the input. Consider |
1032 | * to use print_hex_dump() for the larger input. |
1033 | * - 'a' For a phys_addr_t type and its derivative types (passed by reference) |
1034 | * |
1035 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1036 | * function pointers are really function descriptors, which contain a |
1037 | * pointer to the real address. |
1038 | */ |
1039 | static noinline_for_stack |
1040 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, |
1041 | struct printf_spec spec) |
1042 | { |
1043 | int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0); |
1044 | |
1045 | if (!ptr && *fmt != 'K') { |
1046 | /* |
1047 | * Print (null) with the same width as a pointer so it makes |
1048 | * tabular output look nice. |
1049 | */ |
1050 | if (spec.field_width == -1) |
1051 | spec.field_width = default_width; |
1052 | return string(buf, end, "(null)", spec); |
1053 | } |
1054 | |
1055 | switch (*fmt) { |
1056 | case 'F': |
1057 | case 'f': |
1058 | ptr = dereference_function_descriptor(ptr); |
1059 | /* Fallthrough */ |
1060 | case 'S': |
1061 | case 's': |
1062 | case 'B': |
1063 | return symbol_string(buf, end, ptr, spec, *fmt); |
1064 | case 'R': |
1065 | case 'r': |
1066 | return resource_string(buf, end, ptr, spec, fmt); |
1067 | case 'h': |
1068 | return hex_string(buf, end, ptr, spec, fmt); |
1069 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1070 | case 'm': /* Contiguous: 000102030405 */ |
1071 | /* [mM]F (FDDI) */ |
1072 | /* [mM]R (Reverse order; Bluetooth) */ |
1073 | return mac_address_string(buf, end, ptr, spec, fmt); |
1074 | case 'I': /* Formatted IP supported |
1075 | * 4: 1.2.3.4 |
1076 | * 6: 0001:0203:...:0708 |
1077 | * 6c: 1::708 or 1::1.2.3.4 |
1078 | */ |
1079 | case 'i': /* Contiguous: |
1080 | * 4: 001.002.003.004 |
1081 | * 6: 000102...0f |
1082 | */ |
1083 | switch (fmt[1]) { |
1084 | case '6': |
1085 | return ip6_addr_string(buf, end, ptr, spec, fmt); |
1086 | case '4': |
1087 | return ip4_addr_string(buf, end, ptr, spec, fmt); |
1088 | } |
1089 | break; |
1090 | case 'U': |
1091 | return uuid_string(buf, end, ptr, spec, fmt); |
1092 | case 'V': |
1093 | { |
1094 | va_list va; |
1095 | |
1096 | va_copy(va, *((struct va_format *)ptr)->va); |
1097 | buf += vsnprintf(buf, end > buf ? end - buf : 0, |
1098 | ((struct va_format *)ptr)->fmt, va); |
1099 | va_end(va); |
1100 | return buf; |
1101 | } |
1102 | case 'K': |
1103 | /* |
1104 | * %pK cannot be used in IRQ context because its test |
1105 | * for CAP_SYSLOG would be meaningless. |
1106 | */ |
1107 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1108 | in_nmi())) { |
1109 | if (spec.field_width == -1) |
1110 | spec.field_width = default_width; |
1111 | return string(buf, end, "pK-error", spec); |
1112 | } |
1113 | if (!((kptr_restrict == 0) || |
1114 | (kptr_restrict == 1 && |
1115 | has_capability_noaudit(current, CAP_SYSLOG)))) |
1116 | ptr = NULL; |
1117 | break; |
1118 | case 'N': |
1119 | switch (fmt[1]) { |
1120 | case 'F': |
1121 | return netdev_feature_string(buf, end, ptr, spec); |
1122 | } |
1123 | break; |
1124 | case 'a': |
1125 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
1126 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; |
1127 | spec.base = 16; |
1128 | return number(buf, end, |
1129 | (unsigned long long) *((phys_addr_t *)ptr), spec); |
1130 | } |
1131 | spec.flags |= SMALL; |
1132 | if (spec.field_width == -1) { |
1133 | spec.field_width = default_width; |
1134 | spec.flags |= ZEROPAD; |
1135 | } |
1136 | spec.base = 16; |
1137 | |
1138 | return number(buf, end, (unsigned long) ptr, spec); |
1139 | } |
1140 | |
1141 | /* |
1142 | * Helper function to decode printf style format. |
1143 | * Each call decode a token from the format and return the |
1144 | * number of characters read (or likely the delta where it wants |
1145 | * to go on the next call). |
1146 | * The decoded token is returned through the parameters |
1147 | * |
1148 | * 'h', 'l', or 'L' for integer fields |
1149 | * 'z' support added 23/7/1999 S.H. |
1150 | * 'z' changed to 'Z' --davidm 1/25/99 |
1151 | * 't' added for ptrdiff_t |
1152 | * |
1153 | * @fmt: the format string |
1154 | * @type of the token returned |
1155 | * @flags: various flags such as +, -, # tokens.. |
1156 | * @field_width: overwritten width |
1157 | * @base: base of the number (octal, hex, ...) |
1158 | * @precision: precision of a number |
1159 | * @qualifier: qualifier of a number (long, size_t, ...) |
1160 | */ |
1161 | static noinline_for_stack |
1162 | int format_decode(const char *fmt, struct printf_spec *spec) |
1163 | { |
1164 | const char *start = fmt; |
1165 | |
1166 | /* we finished early by reading the field width */ |
1167 | if (spec->type == FORMAT_TYPE_WIDTH) { |
1168 | if (spec->field_width < 0) { |
1169 | spec->field_width = -spec->field_width; |
1170 | spec->flags |= LEFT; |
1171 | } |
1172 | spec->type = FORMAT_TYPE_NONE; |
1173 | goto precision; |
1174 | } |
1175 | |
1176 | /* we finished early by reading the precision */ |
1177 | if (spec->type == FORMAT_TYPE_PRECISION) { |
1178 | if (spec->precision < 0) |
1179 | spec->precision = 0; |
1180 | |
1181 | spec->type = FORMAT_TYPE_NONE; |
1182 | goto qualifier; |
1183 | } |
1184 | |
1185 | /* By default */ |
1186 | spec->type = FORMAT_TYPE_NONE; |
1187 | |
1188 | for (; *fmt ; ++fmt) { |
1189 | if (*fmt == '%') |
1190 | break; |
1191 | } |
1192 | |
1193 | /* Return the current non-format string */ |
1194 | if (fmt != start || !*fmt) |
1195 | return fmt - start; |
1196 | |
1197 | /* Process flags */ |
1198 | spec->flags = 0; |
1199 | |
1200 | while (1) { /* this also skips first '%' */ |
1201 | bool found = true; |
1202 | |
1203 | ++fmt; |
1204 | |
1205 | switch (*fmt) { |
1206 | case '-': spec->flags |= LEFT; break; |
1207 | case '+': spec->flags |= PLUS; break; |
1208 | case ' ': spec->flags |= SPACE; break; |
1209 | case '#': spec->flags |= SPECIAL; break; |
1210 | case '0': spec->flags |= ZEROPAD; break; |
1211 | default: found = false; |
1212 | } |
1213 | |
1214 | if (!found) |
1215 | break; |
1216 | } |
1217 | |
1218 | /* get field width */ |
1219 | spec->field_width = -1; |
1220 | |
1221 | if (isdigit(*fmt)) |
1222 | spec->field_width = skip_atoi(&fmt); |
1223 | else if (*fmt == '*') { |
1224 | /* it's the next argument */ |
1225 | spec->type = FORMAT_TYPE_WIDTH; |
1226 | return ++fmt - start; |
1227 | } |
1228 | |
1229 | precision: |
1230 | /* get the precision */ |
1231 | spec->precision = -1; |
1232 | if (*fmt == '.') { |
1233 | ++fmt; |
1234 | if (isdigit(*fmt)) { |
1235 | spec->precision = skip_atoi(&fmt); |
1236 | if (spec->precision < 0) |
1237 | spec->precision = 0; |
1238 | } else if (*fmt == '*') { |
1239 | /* it's the next argument */ |
1240 | spec->type = FORMAT_TYPE_PRECISION; |
1241 | return ++fmt - start; |
1242 | } |
1243 | } |
1244 | |
1245 | qualifier: |
1246 | /* get the conversion qualifier */ |
1247 | spec->qualifier = -1; |
1248 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1249 | _tolower(*fmt) == 'z' || *fmt == 't') { |
1250 | spec->qualifier = *fmt++; |
1251 | if (unlikely(spec->qualifier == *fmt)) { |
1252 | if (spec->qualifier == 'l') { |
1253 | spec->qualifier = 'L'; |
1254 | ++fmt; |
1255 | } else if (spec->qualifier == 'h') { |
1256 | spec->qualifier = 'H'; |
1257 | ++fmt; |
1258 | } |
1259 | } |
1260 | } |
1261 | |
1262 | /* default base */ |
1263 | spec->base = 10; |
1264 | switch (*fmt) { |
1265 | case 'c': |
1266 | spec->type = FORMAT_TYPE_CHAR; |
1267 | return ++fmt - start; |
1268 | |
1269 | case 's': |
1270 | spec->type = FORMAT_TYPE_STR; |
1271 | return ++fmt - start; |
1272 | |
1273 | case 'p': |
1274 | spec->type = FORMAT_TYPE_PTR; |
1275 | return fmt - start; |
1276 | /* skip alnum */ |
1277 | |
1278 | case 'n': |
1279 | spec->type = FORMAT_TYPE_NRCHARS; |
1280 | return ++fmt - start; |
1281 | |
1282 | case '%': |
1283 | spec->type = FORMAT_TYPE_PERCENT_CHAR; |
1284 | return ++fmt - start; |
1285 | |
1286 | /* integer number formats - set up the flags and "break" */ |
1287 | case 'o': |
1288 | spec->base = 8; |
1289 | break; |
1290 | |
1291 | case 'x': |
1292 | spec->flags |= SMALL; |
1293 | |
1294 | case 'X': |
1295 | spec->base = 16; |
1296 | break; |
1297 | |
1298 | case 'd': |
1299 | case 'i': |
1300 | spec->flags |= SIGN; |
1301 | case 'u': |
1302 | break; |
1303 | |
1304 | default: |
1305 | spec->type = FORMAT_TYPE_INVALID; |
1306 | return fmt - start; |
1307 | } |
1308 | |
1309 | if (spec->qualifier == 'L') |
1310 | spec->type = FORMAT_TYPE_LONG_LONG; |
1311 | else if (spec->qualifier == 'l') { |
1312 | if (spec->flags & SIGN) |
1313 | spec->type = FORMAT_TYPE_LONG; |
1314 | else |
1315 | spec->type = FORMAT_TYPE_ULONG; |
1316 | } else if (_tolower(spec->qualifier) == 'z') { |
1317 | spec->type = FORMAT_TYPE_SIZE_T; |
1318 | } else if (spec->qualifier == 't') { |
1319 | spec->type = FORMAT_TYPE_PTRDIFF; |
1320 | } else if (spec->qualifier == 'H') { |
1321 | if (spec->flags & SIGN) |
1322 | spec->type = FORMAT_TYPE_BYTE; |
1323 | else |
1324 | spec->type = FORMAT_TYPE_UBYTE; |
1325 | } else if (spec->qualifier == 'h') { |
1326 | if (spec->flags & SIGN) |
1327 | spec->type = FORMAT_TYPE_SHORT; |
1328 | else |
1329 | spec->type = FORMAT_TYPE_USHORT; |
1330 | } else { |
1331 | if (spec->flags & SIGN) |
1332 | spec->type = FORMAT_TYPE_INT; |
1333 | else |
1334 | spec->type = FORMAT_TYPE_UINT; |
1335 | } |
1336 | |
1337 | return ++fmt - start; |
1338 | } |
1339 | |
1340 | /** |
1341 | * vsnprintf - Format a string and place it in a buffer |
1342 | * @buf: The buffer to place the result into |
1343 | * @size: The size of the buffer, including the trailing null space |
1344 | * @fmt: The format string to use |
1345 | * @args: Arguments for the format string |
1346 | * |
1347 | * This function follows C99 vsnprintf, but has some extensions: |
1348 | * %pS output the name of a text symbol with offset |
1349 | * %ps output the name of a text symbol without offset |
1350 | * %pF output the name of a function pointer with its offset |
1351 | * %pf output the name of a function pointer without its offset |
1352 | * %pB output the name of a backtrace symbol with its offset |
1353 | * %pR output the address range in a struct resource with decoded flags |
1354 | * %pr output the address range in a struct resource with raw flags |
1355 | * %pM output a 6-byte MAC address with colons |
1356 | * %pMR output a 6-byte MAC address with colons in reversed order |
1357 | * %pMF output a 6-byte MAC address with dashes |
1358 | * %pm output a 6-byte MAC address without colons |
1359 | * %pmR output a 6-byte MAC address without colons in reversed order |
1360 | * %pI4 print an IPv4 address without leading zeros |
1361 | * %pi4 print an IPv4 address with leading zeros |
1362 | * %pI6 print an IPv6 address with colons |
1363 | * %pi6 print an IPv6 address without colons |
1364 | * %pI6c print an IPv6 address as specified by RFC 5952 |
1365 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1366 | * case. |
1367 | * %*ph[CDN] a variable-length hex string with a separator (supports up to 64 |
1368 | * bytes of the input) |
1369 | * %n is ignored |
1370 | * |
1371 | * ** Please update Documentation/printk-formats.txt when making changes ** |
1372 | * |
1373 | * The return value is the number of characters which would |
1374 | * be generated for the given input, excluding the trailing |
1375 | * '\0', as per ISO C99. If you want to have the exact |
1376 | * number of characters written into @buf as return value |
1377 | * (not including the trailing '\0'), use vscnprintf(). If the |
1378 | * return is greater than or equal to @size, the resulting |
1379 | * string is truncated. |
1380 | * |
1381 | * If you're not already dealing with a va_list consider using snprintf(). |
1382 | */ |
1383 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1384 | { |
1385 | unsigned long long num; |
1386 | char *str, *end; |
1387 | struct printf_spec spec = {0}; |
1388 | |
1389 | /* Reject out-of-range values early. Large positive sizes are |
1390 | used for unknown buffer sizes. */ |
1391 | if (WARN_ON_ONCE((int) size < 0)) |
1392 | return 0; |
1393 | |
1394 | str = buf; |
1395 | end = buf + size; |
1396 | |
1397 | /* Make sure end is always >= buf */ |
1398 | if (end < buf) { |
1399 | end = ((void *)-1); |
1400 | size = end - buf; |
1401 | } |
1402 | |
1403 | while (*fmt) { |
1404 | const char *old_fmt = fmt; |
1405 | int read = format_decode(fmt, &spec); |
1406 | |
1407 | fmt += read; |
1408 | |
1409 | switch (spec.type) { |
1410 | case FORMAT_TYPE_NONE: { |
1411 | int copy = read; |
1412 | if (str < end) { |
1413 | if (copy > end - str) |
1414 | copy = end - str; |
1415 | memcpy(str, old_fmt, copy); |
1416 | } |
1417 | str += read; |
1418 | break; |
1419 | } |
1420 | |
1421 | case FORMAT_TYPE_WIDTH: |
1422 | spec.field_width = va_arg(args, int); |
1423 | break; |
1424 | |
1425 | case FORMAT_TYPE_PRECISION: |
1426 | spec.precision = va_arg(args, int); |
1427 | break; |
1428 | |
1429 | case FORMAT_TYPE_CHAR: { |
1430 | char c; |
1431 | |
1432 | if (!(spec.flags & LEFT)) { |
1433 | while (--spec.field_width > 0) { |
1434 | if (str < end) |
1435 | *str = ' '; |
1436 | ++str; |
1437 | |
1438 | } |
1439 | } |
1440 | c = (unsigned char) va_arg(args, int); |
1441 | if (str < end) |
1442 | *str = c; |
1443 | ++str; |
1444 | while (--spec.field_width > 0) { |
1445 | if (str < end) |
1446 | *str = ' '; |
1447 | ++str; |
1448 | } |
1449 | break; |
1450 | } |
1451 | |
1452 | case FORMAT_TYPE_STR: |
1453 | str = string(str, end, va_arg(args, char *), spec); |
1454 | break; |
1455 | |
1456 | case FORMAT_TYPE_PTR: |
1457 | str = pointer(fmt+1, str, end, va_arg(args, void *), |
1458 | spec); |
1459 | while (isalnum(*fmt)) |
1460 | fmt++; |
1461 | break; |
1462 | |
1463 | case FORMAT_TYPE_PERCENT_CHAR: |
1464 | if (str < end) |
1465 | *str = '%'; |
1466 | ++str; |
1467 | break; |
1468 | |
1469 | case FORMAT_TYPE_INVALID: |
1470 | if (str < end) |
1471 | *str = '%'; |
1472 | ++str; |
1473 | break; |
1474 | |
1475 | case FORMAT_TYPE_NRCHARS: { |
1476 | u8 qualifier = spec.qualifier; |
1477 | |
1478 | if (qualifier == 'l') { |
1479 | long *ip = va_arg(args, long *); |
1480 | *ip = (str - buf); |
1481 | } else if (_tolower(qualifier) == 'z') { |
1482 | size_t *ip = va_arg(args, size_t *); |
1483 | *ip = (str - buf); |
1484 | } else { |
1485 | int *ip = va_arg(args, int *); |
1486 | *ip = (str - buf); |
1487 | } |
1488 | break; |
1489 | } |
1490 | |
1491 | default: |
1492 | switch (spec.type) { |
1493 | case FORMAT_TYPE_LONG_LONG: |
1494 | num = va_arg(args, long long); |
1495 | break; |
1496 | case FORMAT_TYPE_ULONG: |
1497 | num = va_arg(args, unsigned long); |
1498 | break; |
1499 | case FORMAT_TYPE_LONG: |
1500 | num = va_arg(args, long); |
1501 | break; |
1502 | case FORMAT_TYPE_SIZE_T: |
1503 | if (spec.flags & SIGN) |
1504 | num = va_arg(args, ssize_t); |
1505 | else |
1506 | num = va_arg(args, size_t); |
1507 | break; |
1508 | case FORMAT_TYPE_PTRDIFF: |
1509 | num = va_arg(args, ptrdiff_t); |
1510 | break; |
1511 | case FORMAT_TYPE_UBYTE: |
1512 | num = (unsigned char) va_arg(args, int); |
1513 | break; |
1514 | case FORMAT_TYPE_BYTE: |
1515 | num = (signed char) va_arg(args, int); |
1516 | break; |
1517 | case FORMAT_TYPE_USHORT: |
1518 | num = (unsigned short) va_arg(args, int); |
1519 | break; |
1520 | case FORMAT_TYPE_SHORT: |
1521 | num = (short) va_arg(args, int); |
1522 | break; |
1523 | case FORMAT_TYPE_INT: |
1524 | num = (int) va_arg(args, int); |
1525 | break; |
1526 | default: |
1527 | num = va_arg(args, unsigned int); |
1528 | } |
1529 | |
1530 | str = number(str, end, num, spec); |
1531 | } |
1532 | } |
1533 | |
1534 | if (size > 0) { |
1535 | if (str < end) |
1536 | *str = '\0'; |
1537 | else |
1538 | end[-1] = '\0'; |
1539 | } |
1540 | |
1541 | /* the trailing null byte doesn't count towards the total */ |
1542 | return str-buf; |
1543 | |
1544 | } |
1545 | EXPORT_SYMBOL(vsnprintf); |
1546 | |
1547 | /** |
1548 | * vscnprintf - Format a string and place it in a buffer |
1549 | * @buf: The buffer to place the result into |
1550 | * @size: The size of the buffer, including the trailing null space |
1551 | * @fmt: The format string to use |
1552 | * @args: Arguments for the format string |
1553 | * |
1554 | * The return value is the number of characters which have been written into |
1555 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1556 | * returns 0. |
1557 | * |
1558 | * If you're not already dealing with a va_list consider using scnprintf(). |
1559 | * |
1560 | * See the vsnprintf() documentation for format string extensions over C99. |
1561 | */ |
1562 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
1563 | { |
1564 | int i; |
1565 | |
1566 | i = vsnprintf(buf, size, fmt, args); |
1567 | |
1568 | if (likely(i < size)) |
1569 | return i; |
1570 | if (size != 0) |
1571 | return size - 1; |
1572 | return 0; |
1573 | } |
1574 | EXPORT_SYMBOL(vscnprintf); |
1575 | |
1576 | /** |
1577 | * snprintf - Format a string and place it in a buffer |
1578 | * @buf: The buffer to place the result into |
1579 | * @size: The size of the buffer, including the trailing null space |
1580 | * @fmt: The format string to use |
1581 | * @...: Arguments for the format string |
1582 | * |
1583 | * The return value is the number of characters which would be |
1584 | * generated for the given input, excluding the trailing null, |
1585 | * as per ISO C99. If the return is greater than or equal to |
1586 | * @size, the resulting string is truncated. |
1587 | * |
1588 | * See the vsnprintf() documentation for format string extensions over C99. |
1589 | */ |
1590 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1591 | { |
1592 | va_list args; |
1593 | int i; |
1594 | |
1595 | va_start(args, fmt); |
1596 | i = vsnprintf(buf, size, fmt, args); |
1597 | va_end(args); |
1598 | |
1599 | return i; |
1600 | } |
1601 | EXPORT_SYMBOL(snprintf); |
1602 | |
1603 | /** |
1604 | * scnprintf - Format a string and place it in a buffer |
1605 | * @buf: The buffer to place the result into |
1606 | * @size: The size of the buffer, including the trailing null space |
1607 | * @fmt: The format string to use |
1608 | * @...: Arguments for the format string |
1609 | * |
1610 | * The return value is the number of characters written into @buf not including |
1611 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1612 | */ |
1613 | |
1614 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1615 | { |
1616 | va_list args; |
1617 | int i; |
1618 | |
1619 | va_start(args, fmt); |
1620 | i = vscnprintf(buf, size, fmt, args); |
1621 | va_end(args); |
1622 | |
1623 | return i; |
1624 | } |
1625 | EXPORT_SYMBOL(scnprintf); |
1626 | |
1627 | /** |
1628 | * vsprintf - Format a string and place it in a buffer |
1629 | * @buf: The buffer to place the result into |
1630 | * @fmt: The format string to use |
1631 | * @args: Arguments for the format string |
1632 | * |
1633 | * The function returns the number of characters written |
1634 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1635 | * buffer overflows. |
1636 | * |
1637 | * If you're not already dealing with a va_list consider using sprintf(). |
1638 | * |
1639 | * See the vsnprintf() documentation for format string extensions over C99. |
1640 | */ |
1641 | int vsprintf(char *buf, const char *fmt, va_list args) |
1642 | { |
1643 | return vsnprintf(buf, INT_MAX, fmt, args); |
1644 | } |
1645 | EXPORT_SYMBOL(vsprintf); |
1646 | |
1647 | /** |
1648 | * sprintf - Format a string and place it in a buffer |
1649 | * @buf: The buffer to place the result into |
1650 | * @fmt: The format string to use |
1651 | * @...: Arguments for the format string |
1652 | * |
1653 | * The function returns the number of characters written |
1654 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1655 | * buffer overflows. |
1656 | * |
1657 | * See the vsnprintf() documentation for format string extensions over C99. |
1658 | */ |
1659 | int sprintf(char *buf, const char *fmt, ...) |
1660 | { |
1661 | va_list args; |
1662 | int i; |
1663 | |
1664 | va_start(args, fmt); |
1665 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1666 | va_end(args); |
1667 | |
1668 | return i; |
1669 | } |
1670 | EXPORT_SYMBOL(sprintf); |
1671 | |
1672 | #ifdef CONFIG_BINARY_PRINTF |
1673 | /* |
1674 | * bprintf service: |
1675 | * vbin_printf() - VA arguments to binary data |
1676 | * bstr_printf() - Binary data to text string |
1677 | */ |
1678 | |
1679 | /** |
1680 | * vbin_printf - Parse a format string and place args' binary value in a buffer |
1681 | * @bin_buf: The buffer to place args' binary value |
1682 | * @size: The size of the buffer(by words(32bits), not characters) |
1683 | * @fmt: The format string to use |
1684 | * @args: Arguments for the format string |
1685 | * |
1686 | * The format follows C99 vsnprintf, except %n is ignored, and its argument |
1687 | * is skiped. |
1688 | * |
1689 | * The return value is the number of words(32bits) which would be generated for |
1690 | * the given input. |
1691 | * |
1692 | * NOTE: |
1693 | * If the return value is greater than @size, the resulting bin_buf is NOT |
1694 | * valid for bstr_printf(). |
1695 | */ |
1696 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) |
1697 | { |
1698 | struct printf_spec spec = {0}; |
1699 | char *str, *end; |
1700 | |
1701 | str = (char *)bin_buf; |
1702 | end = (char *)(bin_buf + size); |
1703 | |
1704 | #define save_arg(type) \ |
1705 | do { \ |
1706 | if (sizeof(type) == 8) { \ |
1707 | unsigned long long value; \ |
1708 | str = PTR_ALIGN(str, sizeof(u32)); \ |
1709 | value = va_arg(args, unsigned long long); \ |
1710 | if (str + sizeof(type) <= end) { \ |
1711 | *(u32 *)str = *(u32 *)&value; \ |
1712 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ |
1713 | } \ |
1714 | } else { \ |
1715 | unsigned long value; \ |
1716 | str = PTR_ALIGN(str, sizeof(type)); \ |
1717 | value = va_arg(args, int); \ |
1718 | if (str + sizeof(type) <= end) \ |
1719 | *(typeof(type) *)str = (type)value; \ |
1720 | } \ |
1721 | str += sizeof(type); \ |
1722 | } while (0) |
1723 | |
1724 | while (*fmt) { |
1725 | int read = format_decode(fmt, &spec); |
1726 | |
1727 | fmt += read; |
1728 | |
1729 | switch (spec.type) { |
1730 | case FORMAT_TYPE_NONE: |
1731 | case FORMAT_TYPE_INVALID: |
1732 | case FORMAT_TYPE_PERCENT_CHAR: |
1733 | break; |
1734 | |
1735 | case FORMAT_TYPE_WIDTH: |
1736 | case FORMAT_TYPE_PRECISION: |
1737 | save_arg(int); |
1738 | break; |
1739 | |
1740 | case FORMAT_TYPE_CHAR: |
1741 | save_arg(char); |
1742 | break; |
1743 | |
1744 | case FORMAT_TYPE_STR: { |
1745 | const char *save_str = va_arg(args, char *); |
1746 | size_t len; |
1747 | |
1748 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1749 | || (unsigned long)save_str < PAGE_SIZE) |
1750 | save_str = "(null)"; |
1751 | len = strlen(save_str) + 1; |
1752 | if (str + len < end) |
1753 | memcpy(str, save_str, len); |
1754 | str += len; |
1755 | break; |
1756 | } |
1757 | |
1758 | case FORMAT_TYPE_PTR: |
1759 | save_arg(void *); |
1760 | /* skip all alphanumeric pointer suffixes */ |
1761 | while (isalnum(*fmt)) |
1762 | fmt++; |
1763 | break; |
1764 | |
1765 | case FORMAT_TYPE_NRCHARS: { |
1766 | /* skip %n 's argument */ |
1767 | u8 qualifier = spec.qualifier; |
1768 | void *skip_arg; |
1769 | if (qualifier == 'l') |
1770 | skip_arg = va_arg(args, long *); |
1771 | else if (_tolower(qualifier) == 'z') |
1772 | skip_arg = va_arg(args, size_t *); |
1773 | else |
1774 | skip_arg = va_arg(args, int *); |
1775 | break; |
1776 | } |
1777 | |
1778 | default: |
1779 | switch (spec.type) { |
1780 | |
1781 | case FORMAT_TYPE_LONG_LONG: |
1782 | save_arg(long long); |
1783 | break; |
1784 | case FORMAT_TYPE_ULONG: |
1785 | case FORMAT_TYPE_LONG: |
1786 | save_arg(unsigned long); |
1787 | break; |
1788 | case FORMAT_TYPE_SIZE_T: |
1789 | save_arg(size_t); |
1790 | break; |
1791 | case FORMAT_TYPE_PTRDIFF: |
1792 | save_arg(ptrdiff_t); |
1793 | break; |
1794 | case FORMAT_TYPE_UBYTE: |
1795 | case FORMAT_TYPE_BYTE: |
1796 | save_arg(char); |
1797 | break; |
1798 | case FORMAT_TYPE_USHORT: |
1799 | case FORMAT_TYPE_SHORT: |
1800 | save_arg(short); |
1801 | break; |
1802 | default: |
1803 | save_arg(int); |
1804 | } |
1805 | } |
1806 | } |
1807 | |
1808 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
1809 | #undef save_arg |
1810 | } |
1811 | EXPORT_SYMBOL_GPL(vbin_printf); |
1812 | |
1813 | /** |
1814 | * bstr_printf - Format a string from binary arguments and place it in a buffer |
1815 | * @buf: The buffer to place the result into |
1816 | * @size: The size of the buffer, including the trailing null space |
1817 | * @fmt: The format string to use |
1818 | * @bin_buf: Binary arguments for the format string |
1819 | * |
1820 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets |
1821 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is |
1822 | * a binary buffer that generated by vbin_printf. |
1823 | * |
1824 | * The format follows C99 vsnprintf, but has some extensions: |
1825 | * see vsnprintf comment for details. |
1826 | * |
1827 | * The return value is the number of characters which would |
1828 | * be generated for the given input, excluding the trailing |
1829 | * '\0', as per ISO C99. If you want to have the exact |
1830 | * number of characters written into @buf as return value |
1831 | * (not including the trailing '\0'), use vscnprintf(). If the |
1832 | * return is greater than or equal to @size, the resulting |
1833 | * string is truncated. |
1834 | */ |
1835 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) |
1836 | { |
1837 | struct printf_spec spec = {0}; |
1838 | char *str, *end; |
1839 | const char *args = (const char *)bin_buf; |
1840 | |
1841 | if (WARN_ON_ONCE((int) size < 0)) |
1842 | return 0; |
1843 | |
1844 | str = buf; |
1845 | end = buf + size; |
1846 | |
1847 | #define get_arg(type) \ |
1848 | ({ \ |
1849 | typeof(type) value; \ |
1850 | if (sizeof(type) == 8) { \ |
1851 | args = PTR_ALIGN(args, sizeof(u32)); \ |
1852 | *(u32 *)&value = *(u32 *)args; \ |
1853 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ |
1854 | } else { \ |
1855 | args = PTR_ALIGN(args, sizeof(type)); \ |
1856 | value = *(typeof(type) *)args; \ |
1857 | } \ |
1858 | args += sizeof(type); \ |
1859 | value; \ |
1860 | }) |
1861 | |
1862 | /* Make sure end is always >= buf */ |
1863 | if (end < buf) { |
1864 | end = ((void *)-1); |
1865 | size = end - buf; |
1866 | } |
1867 | |
1868 | while (*fmt) { |
1869 | const char *old_fmt = fmt; |
1870 | int read = format_decode(fmt, &spec); |
1871 | |
1872 | fmt += read; |
1873 | |
1874 | switch (spec.type) { |
1875 | case FORMAT_TYPE_NONE: { |
1876 | int copy = read; |
1877 | if (str < end) { |
1878 | if (copy > end - str) |
1879 | copy = end - str; |
1880 | memcpy(str, old_fmt, copy); |
1881 | } |
1882 | str += read; |
1883 | break; |
1884 | } |
1885 | |
1886 | case FORMAT_TYPE_WIDTH: |
1887 | spec.field_width = get_arg(int); |
1888 | break; |
1889 | |
1890 | case FORMAT_TYPE_PRECISION: |
1891 | spec.precision = get_arg(int); |
1892 | break; |
1893 | |
1894 | case FORMAT_TYPE_CHAR: { |
1895 | char c; |
1896 | |
1897 | if (!(spec.flags & LEFT)) { |
1898 | while (--spec.field_width > 0) { |
1899 | if (str < end) |
1900 | *str = ' '; |
1901 | ++str; |
1902 | } |
1903 | } |
1904 | c = (unsigned char) get_arg(char); |
1905 | if (str < end) |
1906 | *str = c; |
1907 | ++str; |
1908 | while (--spec.field_width > 0) { |
1909 | if (str < end) |
1910 | *str = ' '; |
1911 | ++str; |
1912 | } |
1913 | break; |
1914 | } |
1915 | |
1916 | case FORMAT_TYPE_STR: { |
1917 | const char *str_arg = args; |
1918 | args += strlen(str_arg) + 1; |
1919 | str = string(str, end, (char *)str_arg, spec); |
1920 | break; |
1921 | } |
1922 | |
1923 | case FORMAT_TYPE_PTR: |
1924 | str = pointer(fmt+1, str, end, get_arg(void *), spec); |
1925 | while (isalnum(*fmt)) |
1926 | fmt++; |
1927 | break; |
1928 | |
1929 | case FORMAT_TYPE_PERCENT_CHAR: |
1930 | case FORMAT_TYPE_INVALID: |
1931 | if (str < end) |
1932 | *str = '%'; |
1933 | ++str; |
1934 | break; |
1935 | |
1936 | case FORMAT_TYPE_NRCHARS: |
1937 | /* skip */ |
1938 | break; |
1939 | |
1940 | default: { |
1941 | unsigned long long num; |
1942 | |
1943 | switch (spec.type) { |
1944 | |
1945 | case FORMAT_TYPE_LONG_LONG: |
1946 | num = get_arg(long long); |
1947 | break; |
1948 | case FORMAT_TYPE_ULONG: |
1949 | case FORMAT_TYPE_LONG: |
1950 | num = get_arg(unsigned long); |
1951 | break; |
1952 | case FORMAT_TYPE_SIZE_T: |
1953 | num = get_arg(size_t); |
1954 | break; |
1955 | case FORMAT_TYPE_PTRDIFF: |
1956 | num = get_arg(ptrdiff_t); |
1957 | break; |
1958 | case FORMAT_TYPE_UBYTE: |
1959 | num = get_arg(unsigned char); |
1960 | break; |
1961 | case FORMAT_TYPE_BYTE: |
1962 | num = get_arg(signed char); |
1963 | break; |
1964 | case FORMAT_TYPE_USHORT: |
1965 | num = get_arg(unsigned short); |
1966 | break; |
1967 | case FORMAT_TYPE_SHORT: |
1968 | num = get_arg(short); |
1969 | break; |
1970 | case FORMAT_TYPE_UINT: |
1971 | num = get_arg(unsigned int); |
1972 | break; |
1973 | default: |
1974 | num = get_arg(int); |
1975 | } |
1976 | |
1977 | str = number(str, end, num, spec); |
1978 | } /* default: */ |
1979 | } /* switch(spec.type) */ |
1980 | } /* while(*fmt) */ |
1981 | |
1982 | if (size > 0) { |
1983 | if (str < end) |
1984 | *str = '\0'; |
1985 | else |
1986 | end[-1] = '\0'; |
1987 | } |
1988 | |
1989 | #undef get_arg |
1990 | |
1991 | /* the trailing null byte doesn't count towards the total */ |
1992 | return str - buf; |
1993 | } |
1994 | EXPORT_SYMBOL_GPL(bstr_printf); |
1995 | |
1996 | /** |
1997 | * bprintf - Parse a format string and place args' binary value in a buffer |
1998 | * @bin_buf: The buffer to place args' binary value |
1999 | * @size: The size of the buffer(by words(32bits), not characters) |
2000 | * @fmt: The format string to use |
2001 | * @...: Arguments for the format string |
2002 | * |
2003 | * The function returns the number of words(u32) written |
2004 | * into @bin_buf. |
2005 | */ |
2006 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) |
2007 | { |
2008 | va_list args; |
2009 | int ret; |
2010 | |
2011 | va_start(args, fmt); |
2012 | ret = vbin_printf(bin_buf, size, fmt, args); |
2013 | va_end(args); |
2014 | |
2015 | return ret; |
2016 | } |
2017 | EXPORT_SYMBOL_GPL(bprintf); |
2018 | |
2019 | #endif /* CONFIG_BINARY_PRINTF */ |
2020 | |
2021 | /** |
2022 | * vsscanf - Unformat a buffer into a list of arguments |
2023 | * @buf: input buffer |
2024 | * @fmt: format of buffer |
2025 | * @args: arguments |
2026 | */ |
2027 | int vsscanf(const char *buf, const char *fmt, va_list args) |
2028 | { |
2029 | const char *str = buf; |
2030 | char *next; |
2031 | char digit; |
2032 | int num = 0; |
2033 | u8 qualifier; |
2034 | unsigned int base; |
2035 | union { |
2036 | long long s; |
2037 | unsigned long long u; |
2038 | } val; |
2039 | s16 field_width; |
2040 | bool is_sign; |
2041 | |
2042 | while (*fmt) { |
2043 | /* skip any white space in format */ |
2044 | /* white space in format matchs any amount of |
2045 | * white space, including none, in the input. |
2046 | */ |
2047 | if (isspace(*fmt)) { |
2048 | fmt = skip_spaces(++fmt); |
2049 | str = skip_spaces(str); |
2050 | } |
2051 | |
2052 | /* anything that is not a conversion must match exactly */ |
2053 | if (*fmt != '%' && *fmt) { |
2054 | if (*fmt++ != *str++) |
2055 | break; |
2056 | continue; |
2057 | } |
2058 | |
2059 | if (!*fmt) |
2060 | break; |
2061 | ++fmt; |
2062 | |
2063 | /* skip this conversion. |
2064 | * advance both strings to next white space |
2065 | */ |
2066 | if (*fmt == '*') { |
2067 | if (!*str) |
2068 | break; |
2069 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
2070 | fmt++; |
2071 | while (!isspace(*str) && *str) |
2072 | str++; |
2073 | continue; |
2074 | } |
2075 | |
2076 | /* get field width */ |
2077 | field_width = -1; |
2078 | if (isdigit(*fmt)) { |
2079 | field_width = skip_atoi(&fmt); |
2080 | if (field_width <= 0) |
2081 | break; |
2082 | } |
2083 | |
2084 | /* get conversion qualifier */ |
2085 | qualifier = -1; |
2086 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2087 | _tolower(*fmt) == 'z') { |
2088 | qualifier = *fmt++; |
2089 | if (unlikely(qualifier == *fmt)) { |
2090 | if (qualifier == 'h') { |
2091 | qualifier = 'H'; |
2092 | fmt++; |
2093 | } else if (qualifier == 'l') { |
2094 | qualifier = 'L'; |
2095 | fmt++; |
2096 | } |
2097 | } |
2098 | } |
2099 | |
2100 | if (!*fmt) |
2101 | break; |
2102 | |
2103 | if (*fmt == 'n') { |
2104 | /* return number of characters read so far */ |
2105 | *va_arg(args, int *) = str - buf; |
2106 | ++fmt; |
2107 | continue; |
2108 | } |
2109 | |
2110 | if (!*str) |
2111 | break; |
2112 | |
2113 | base = 10; |
2114 | is_sign = 0; |
2115 | |
2116 | switch (*fmt++) { |
2117 | case 'c': |
2118 | { |
2119 | char *s = (char *)va_arg(args, char*); |
2120 | if (field_width == -1) |
2121 | field_width = 1; |
2122 | do { |
2123 | *s++ = *str++; |
2124 | } while (--field_width > 0 && *str); |
2125 | num++; |
2126 | } |
2127 | continue; |
2128 | case 's': |
2129 | { |
2130 | char *s = (char *)va_arg(args, char *); |
2131 | if (field_width == -1) |
2132 | field_width = SHRT_MAX; |
2133 | /* first, skip leading white space in buffer */ |
2134 | str = skip_spaces(str); |
2135 | |
2136 | /* now copy until next white space */ |
2137 | while (*str && !isspace(*str) && field_width--) |
2138 | *s++ = *str++; |
2139 | *s = '\0'; |
2140 | num++; |
2141 | } |
2142 | continue; |
2143 | case 'o': |
2144 | base = 8; |
2145 | break; |
2146 | case 'x': |
2147 | case 'X': |
2148 | base = 16; |
2149 | break; |
2150 | case 'i': |
2151 | base = 0; |
2152 | case 'd': |
2153 | is_sign = 1; |
2154 | case 'u': |
2155 | break; |
2156 | case '%': |
2157 | /* looking for '%' in str */ |
2158 | if (*str++ != '%') |
2159 | return num; |
2160 | continue; |
2161 | default: |
2162 | /* invalid format; stop here */ |
2163 | return num; |
2164 | } |
2165 | |
2166 | /* have some sort of integer conversion. |
2167 | * first, skip white space in buffer. |
2168 | */ |
2169 | str = skip_spaces(str); |
2170 | |
2171 | digit = *str; |
2172 | if (is_sign && digit == '-') |
2173 | digit = *(str + 1); |
2174 | |
2175 | if (!digit |
2176 | || (base == 16 && !isxdigit(digit)) |
2177 | || (base == 10 && !isdigit(digit)) |
2178 | || (base == 8 && (!isdigit(digit) || digit > '7')) |
2179 | || (base == 0 && !isdigit(digit))) |
2180 | break; |
2181 | |
2182 | if (is_sign) |
2183 | val.s = qualifier != 'L' ? |
2184 | simple_strtol(str, &next, base) : |
2185 | simple_strtoll(str, &next, base); |
2186 | else |
2187 | val.u = qualifier != 'L' ? |
2188 | simple_strtoul(str, &next, base) : |
2189 | simple_strtoull(str, &next, base); |
2190 | |
2191 | if (field_width > 0 && next - str > field_width) { |
2192 | if (base == 0) |
2193 | _parse_integer_fixup_radix(str, &base); |
2194 | while (next - str > field_width) { |
2195 | if (is_sign) |
2196 | val.s = div_s64(val.s, base); |
2197 | else |
2198 | val.u = div_u64(val.u, base); |
2199 | --next; |
2200 | } |
2201 | } |
2202 | |
2203 | switch (qualifier) { |
2204 | case 'H': /* that's 'hh' in format */ |
2205 | if (is_sign) |
2206 | *va_arg(args, signed char *) = val.s; |
2207 | else |
2208 | *va_arg(args, unsigned char *) = val.u; |
2209 | break; |
2210 | case 'h': |
2211 | if (is_sign) |
2212 | *va_arg(args, short *) = val.s; |
2213 | else |
2214 | *va_arg(args, unsigned short *) = val.u; |
2215 | break; |
2216 | case 'l': |
2217 | if (is_sign) |
2218 | *va_arg(args, long *) = val.s; |
2219 | else |
2220 | *va_arg(args, unsigned long *) = val.u; |
2221 | break; |
2222 | case 'L': |
2223 | if (is_sign) |
2224 | *va_arg(args, long long *) = val.s; |
2225 | else |
2226 | *va_arg(args, unsigned long long *) = val.u; |
2227 | break; |
2228 | case 'Z': |
2229 | case 'z': |
2230 | *va_arg(args, size_t *) = val.u; |
2231 | break; |
2232 | default: |
2233 | if (is_sign) |
2234 | *va_arg(args, int *) = val.s; |
2235 | else |
2236 | *va_arg(args, unsigned int *) = val.u; |
2237 | break; |
2238 | } |
2239 | num++; |
2240 | |
2241 | if (!next) |
2242 | break; |
2243 | str = next; |
2244 | } |
2245 | |
2246 | return num; |
2247 | } |
2248 | EXPORT_SYMBOL(vsscanf); |
2249 | |
2250 | /** |
2251 | * sscanf - Unformat a buffer into a list of arguments |
2252 | * @buf: input buffer |
2253 | * @fmt: formatting of buffer |
2254 | * @...: resulting arguments |
2255 | */ |
2256 | int sscanf(const char *buf, const char *fmt, ...) |
2257 | { |
2258 | va_list args; |
2259 | int i; |
2260 | |
2261 | va_start(args, fmt); |
2262 | i = vsscanf(buf, fmt, args); |
2263 | va_end(args); |
2264 | |
2265 | return i; |
2266 | } |
2267 | EXPORT_SYMBOL(sscanf); |
2268 |
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v2.6.34-rc5
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