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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/clk.h> | |
21 | #include <linux/clk-provider.h> | |
22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ | |
23 | #include <linux/types.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/kallsyms.h> | |
28 | #include <linux/math64.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/ioport.h> | |
31 | #include <linux/dcache.h> | |
32 | #include <linux/cred.h> | |
33 | #include <net/addrconf.h> | |
34 | ||
35 | #include <asm/page.h> /* for PAGE_SIZE */ | |
36 | #include <asm/sections.h> /* for dereference_function_descriptor() */ | |
37 | #include <asm/byteorder.h> /* cpu_to_le16 */ | |
38 | ||
39 | #include <linux/string_helpers.h> | |
40 | #include "kstrtox.h" | |
41 | ||
42 | /** | |
43 | * simple_strtoull - convert a string to an unsigned long long | |
44 | * @cp: The start of the string | |
45 | * @endp: A pointer to the end of the parsed string will be placed here | |
46 | * @base: The number base to use | |
47 | * | |
48 | * This function is obsolete. Please use kstrtoull instead. | |
49 | */ | |
50 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) | |
51 | { | |
52 | unsigned long long result; | |
53 | unsigned int rv; | |
54 | ||
55 | cp = _parse_integer_fixup_radix(cp, &base); | |
56 | rv = _parse_integer(cp, base, &result); | |
57 | /* FIXME */ | |
58 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
59 | ||
60 | if (endp) | |
61 | *endp = (char *)cp; | |
62 | ||
63 | return result; | |
64 | } | |
65 | EXPORT_SYMBOL(simple_strtoull); | |
66 | ||
67 | /** | |
68 | * simple_strtoul - convert a string to an unsigned long | |
69 | * @cp: The start of the string | |
70 | * @endp: A pointer to the end of the parsed string will be placed here | |
71 | * @base: The number base to use | |
72 | * | |
73 | * This function is obsolete. Please use kstrtoul instead. | |
74 | */ | |
75 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) | |
76 | { | |
77 | return simple_strtoull(cp, endp, base); | |
78 | } | |
79 | EXPORT_SYMBOL(simple_strtoul); | |
80 | ||
81 | /** | |
82 | * simple_strtol - convert a string to a signed 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 | * This function is obsolete. Please use kstrtol instead. | |
88 | */ | |
89 | long simple_strtol(const char *cp, char **endp, unsigned int base) | |
90 | { | |
91 | if (*cp == '-') | |
92 | return -simple_strtoul(cp + 1, endp, base); | |
93 | ||
94 | return simple_strtoul(cp, endp, base); | |
95 | } | |
96 | EXPORT_SYMBOL(simple_strtol); | |
97 | ||
98 | /** | |
99 | * simple_strtoll - convert a string to a signed long long | |
100 | * @cp: The start of the string | |
101 | * @endp: A pointer to the end of the parsed string will be placed here | |
102 | * @base: The number base to use | |
103 | * | |
104 | * This function is obsolete. Please use kstrtoll instead. | |
105 | */ | |
106 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) | |
107 | { | |
108 | if (*cp == '-') | |
109 | return -simple_strtoull(cp + 1, endp, base); | |
110 | ||
111 | return simple_strtoull(cp, endp, base); | |
112 | } | |
113 | EXPORT_SYMBOL(simple_strtoll); | |
114 | ||
115 | static noinline_for_stack | |
116 | int skip_atoi(const char **s) | |
117 | { | |
118 | int i = 0; | |
119 | ||
120 | do { | |
121 | i = i*10 + *((*s)++) - '0'; | |
122 | } while (isdigit(**s)); | |
123 | ||
124 | return i; | |
125 | } | |
126 | ||
127 | /* | |
128 | * Decimal conversion is by far the most typical, and is used for | |
129 | * /proc and /sys data. This directly impacts e.g. top performance | |
130 | * with many processes running. We optimize it for speed by emitting | |
131 | * two characters at a time, using a 200 byte lookup table. This | |
132 | * roughly halves the number of multiplications compared to computing | |
133 | * the digits one at a time. Implementation strongly inspired by the | |
134 | * previous version, which in turn used ideas described at | |
135 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
136 | * from the author, Douglas W. Jones). | |
137 | * | |
138 | * It turns out there is precisely one 26 bit fixed-point | |
139 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
140 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
141 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
142 | * irrelevant for our purpose. | |
143 | * | |
144 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
145 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
146 | * | |
147 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
148 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
149 | * for all x <= 43698. | |
150 | */ | |
151 | ||
152 | static const u16 decpair[100] = { | |
153 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
154 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
155 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
156 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
157 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
158 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
159 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
160 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
161 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
162 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
163 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
164 | #undef _ | |
165 | }; | |
166 | ||
167 | /* | |
168 | * This will print a single '0' even if r == 0, since we would | |
169 | * immediately jump to out_r where two 0s would be written but only | |
170 | * one of them accounted for in buf. This is needed by ip4_string | |
171 | * below. All other callers pass a non-zero value of r. | |
172 | */ | |
173 | static noinline_for_stack | |
174 | char *put_dec_trunc8(char *buf, unsigned r) | |
175 | { | |
176 | unsigned q; | |
177 | ||
178 | /* 1 <= r < 10^8 */ | |
179 | if (r < 100) | |
180 | goto out_r; | |
181 | ||
182 | /* 100 <= r < 10^8 */ | |
183 | q = (r * (u64)0x28f5c29) >> 32; | |
184 | *((u16 *)buf) = decpair[r - 100*q]; | |
185 | buf += 2; | |
186 | ||
187 | /* 1 <= q < 10^6 */ | |
188 | if (q < 100) | |
189 | goto out_q; | |
190 | ||
191 | /* 100 <= q < 10^6 */ | |
192 | r = (q * (u64)0x28f5c29) >> 32; | |
193 | *((u16 *)buf) = decpair[q - 100*r]; | |
194 | buf += 2; | |
195 | ||
196 | /* 1 <= r < 10^4 */ | |
197 | if (r < 100) | |
198 | goto out_r; | |
199 | ||
200 | /* 100 <= r < 10^4 */ | |
201 | q = (r * 0x147b) >> 19; | |
202 | *((u16 *)buf) = decpair[r - 100*q]; | |
203 | buf += 2; | |
204 | out_q: | |
205 | /* 1 <= q < 100 */ | |
206 | r = q; | |
207 | out_r: | |
208 | /* 1 <= r < 100 */ | |
209 | *((u16 *)buf) = decpair[r]; | |
210 | buf += r < 10 ? 1 : 2; | |
211 | return buf; | |
212 | } | |
213 | ||
214 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 | |
215 | static noinline_for_stack | |
216 | char *put_dec_full8(char *buf, unsigned r) | |
217 | { | |
218 | unsigned q; | |
219 | ||
220 | /* 0 <= r < 10^8 */ | |
221 | q = (r * (u64)0x28f5c29) >> 32; | |
222 | *((u16 *)buf) = decpair[r - 100*q]; | |
223 | buf += 2; | |
224 | ||
225 | /* 0 <= q < 10^6 */ | |
226 | r = (q * (u64)0x28f5c29) >> 32; | |
227 | *((u16 *)buf) = decpair[q - 100*r]; | |
228 | buf += 2; | |
229 | ||
230 | /* 0 <= r < 10^4 */ | |
231 | q = (r * 0x147b) >> 19; | |
232 | *((u16 *)buf) = decpair[r - 100*q]; | |
233 | buf += 2; | |
234 | ||
235 | /* 0 <= q < 100 */ | |
236 | *((u16 *)buf) = decpair[q]; | |
237 | buf += 2; | |
238 | return buf; | |
239 | } | |
240 | ||
241 | static noinline_for_stack | |
242 | char *put_dec(char *buf, unsigned long long n) | |
243 | { | |
244 | if (n >= 100*1000*1000) | |
245 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
246 | /* 1 <= n <= 1.6e11 */ | |
247 | if (n >= 100*1000*1000) | |
248 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
249 | /* 1 <= n < 1e8 */ | |
250 | return put_dec_trunc8(buf, n); | |
251 | } | |
252 | ||
253 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 | |
254 | ||
255 | static void | |
256 | put_dec_full4(char *buf, unsigned r) | |
257 | { | |
258 | unsigned q; | |
259 | ||
260 | /* 0 <= r < 10^4 */ | |
261 | q = (r * 0x147b) >> 19; | |
262 | *((u16 *)buf) = decpair[r - 100*q]; | |
263 | buf += 2; | |
264 | /* 0 <= q < 100 */ | |
265 | *((u16 *)buf) = decpair[q]; | |
266 | } | |
267 | ||
268 | /* | |
269 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
270 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
271 | * holds for all x < 1,128,869,999. The largest value this | |
272 | * helper will ever be asked to convert is 1,125,520,955. | |
273 | * (second call in the put_dec code, assuming n is all-ones). | |
274 | */ | |
275 | static noinline_for_stack | |
276 | unsigned put_dec_helper4(char *buf, unsigned x) | |
277 | { | |
278 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
279 | ||
280 | put_dec_full4(buf, x - q * 10000); | |
281 | return q; | |
282 | } | |
283 | ||
284 | /* Based on code by Douglas W. Jones found at | |
285 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
286 | * (with permission from the author). | |
287 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
288 | */ | |
289 | static | |
290 | char *put_dec(char *buf, unsigned long long n) | |
291 | { | |
292 | uint32_t d3, d2, d1, q, h; | |
293 | ||
294 | if (n < 100*1000*1000) | |
295 | return put_dec_trunc8(buf, n); | |
296 | ||
297 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
298 | h = (n >> 32); | |
299 | d2 = (h ) & 0xffff; | |
300 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
301 | ||
302 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 | |
303 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
304 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); | |
305 | q = put_dec_helper4(buf, q); | |
306 | ||
307 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
308 | q = put_dec_helper4(buf+4, q); | |
309 | ||
310 | q += 4749 * d3 + 42 * d2; | |
311 | q = put_dec_helper4(buf+8, q); | |
312 | ||
313 | q += 281 * d3; | |
314 | buf += 12; | |
315 | if (q) | |
316 | buf = put_dec_trunc8(buf, q); | |
317 | else while (buf[-1] == '0') | |
318 | --buf; | |
319 | ||
320 | return buf; | |
321 | } | |
322 | ||
323 | #endif | |
324 | ||
325 | /* | |
326 | * Convert passed number to decimal string. | |
327 | * Returns the length of string. On buffer overflow, returns 0. | |
328 | * | |
329 | * If speed is not important, use snprintf(). It's easy to read the code. | |
330 | */ | |
331 | int num_to_str(char *buf, int size, unsigned long long num) | |
332 | { | |
333 | /* put_dec requires 2-byte alignment of the buffer. */ | |
334 | char tmp[sizeof(num) * 3] __aligned(2); | |
335 | int idx, len; | |
336 | ||
337 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ | |
338 | if (num <= 9) { | |
339 | tmp[0] = '0' + num; | |
340 | len = 1; | |
341 | } else { | |
342 | len = put_dec(tmp, num) - tmp; | |
343 | } | |
344 | ||
345 | if (len > size) | |
346 | return 0; | |
347 | for (idx = 0; idx < len; ++idx) | |
348 | buf[idx] = tmp[len - idx - 1]; | |
349 | return len; | |
350 | } | |
351 | ||
352 | #define SIGN 1 /* unsigned/signed, must be 1 */ | |
353 | #define LEFT 2 /* left justified */ | |
354 | #define PLUS 4 /* show plus */ | |
355 | #define SPACE 8 /* space if plus */ | |
356 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ | |
357 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ | |
358 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
359 | ||
360 | enum format_type { | |
361 | FORMAT_TYPE_NONE, /* Just a string part */ | |
362 | FORMAT_TYPE_WIDTH, | |
363 | FORMAT_TYPE_PRECISION, | |
364 | FORMAT_TYPE_CHAR, | |
365 | FORMAT_TYPE_STR, | |
366 | FORMAT_TYPE_PTR, | |
367 | FORMAT_TYPE_PERCENT_CHAR, | |
368 | FORMAT_TYPE_INVALID, | |
369 | FORMAT_TYPE_LONG_LONG, | |
370 | FORMAT_TYPE_ULONG, | |
371 | FORMAT_TYPE_LONG, | |
372 | FORMAT_TYPE_UBYTE, | |
373 | FORMAT_TYPE_BYTE, | |
374 | FORMAT_TYPE_USHORT, | |
375 | FORMAT_TYPE_SHORT, | |
376 | FORMAT_TYPE_UINT, | |
377 | FORMAT_TYPE_INT, | |
378 | FORMAT_TYPE_SIZE_T, | |
379 | FORMAT_TYPE_PTRDIFF | |
380 | }; | |
381 | ||
382 | struct printf_spec { | |
383 | u8 type; /* format_type enum */ | |
384 | u8 flags; /* flags to number() */ | |
385 | u8 base; /* number base, 8, 10 or 16 only */ | |
386 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
387 | s16 field_width; /* width of output field */ | |
388 | s16 precision; /* # of digits/chars */ | |
389 | }; | |
390 | ||
391 | static noinline_for_stack | |
392 | char *number(char *buf, char *end, unsigned long long num, | |
393 | struct printf_spec spec) | |
394 | { | |
395 | /* put_dec requires 2-byte alignment of the buffer. */ | |
396 | char tmp[3 * sizeof(num)] __aligned(2); | |
397 | char sign; | |
398 | char locase; | |
399 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); | |
400 | int i; | |
401 | bool is_zero = num == 0LL; | |
402 | ||
403 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
404 | * produces same digits or (maybe lowercased) letters */ | |
405 | locase = (spec.flags & SMALL); | |
406 | if (spec.flags & LEFT) | |
407 | spec.flags &= ~ZEROPAD; | |
408 | sign = 0; | |
409 | if (spec.flags & SIGN) { | |
410 | if ((signed long long)num < 0) { | |
411 | sign = '-'; | |
412 | num = -(signed long long)num; | |
413 | spec.field_width--; | |
414 | } else if (spec.flags & PLUS) { | |
415 | sign = '+'; | |
416 | spec.field_width--; | |
417 | } else if (spec.flags & SPACE) { | |
418 | sign = ' '; | |
419 | spec.field_width--; | |
420 | } | |
421 | } | |
422 | if (need_pfx) { | |
423 | if (spec.base == 16) | |
424 | spec.field_width -= 2; | |
425 | else if (!is_zero) | |
426 | spec.field_width--; | |
427 | } | |
428 | ||
429 | /* generate full string in tmp[], in reverse order */ | |
430 | i = 0; | |
431 | if (num < spec.base) | |
432 | tmp[i++] = hex_asc_upper[num] | locase; | |
433 | else if (spec.base != 10) { /* 8 or 16 */ | |
434 | int mask = spec.base - 1; | |
435 | int shift = 3; | |
436 | ||
437 | if (spec.base == 16) | |
438 | shift = 4; | |
439 | do { | |
440 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); | |
441 | num >>= shift; | |
442 | } while (num); | |
443 | } else { /* base 10 */ | |
444 | i = put_dec(tmp, num) - tmp; | |
445 | } | |
446 | ||
447 | /* printing 100 using %2d gives "100", not "00" */ | |
448 | if (i > spec.precision) | |
449 | spec.precision = i; | |
450 | /* leading space padding */ | |
451 | spec.field_width -= spec.precision; | |
452 | if (!(spec.flags & (ZEROPAD | LEFT))) { | |
453 | while (--spec.field_width >= 0) { | |
454 | if (buf < end) | |
455 | *buf = ' '; | |
456 | ++buf; | |
457 | } | |
458 | } | |
459 | /* sign */ | |
460 | if (sign) { | |
461 | if (buf < end) | |
462 | *buf = sign; | |
463 | ++buf; | |
464 | } | |
465 | /* "0x" / "0" prefix */ | |
466 | if (need_pfx) { | |
467 | if (spec.base == 16 || !is_zero) { | |
468 | if (buf < end) | |
469 | *buf = '0'; | |
470 | ++buf; | |
471 | } | |
472 | if (spec.base == 16) { | |
473 | if (buf < end) | |
474 | *buf = ('X' | locase); | |
475 | ++buf; | |
476 | } | |
477 | } | |
478 | /* zero or space padding */ | |
479 | if (!(spec.flags & LEFT)) { | |
480 | char c = ' ' + (spec.flags & ZEROPAD); | |
481 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
482 | while (--spec.field_width >= 0) { | |
483 | if (buf < end) | |
484 | *buf = c; | |
485 | ++buf; | |
486 | } | |
487 | } | |
488 | /* hmm even more zero padding? */ | |
489 | while (i <= --spec.precision) { | |
490 | if (buf < end) | |
491 | *buf = '0'; | |
492 | ++buf; | |
493 | } | |
494 | /* actual digits of result */ | |
495 | while (--i >= 0) { | |
496 | if (buf < end) | |
497 | *buf = tmp[i]; | |
498 | ++buf; | |
499 | } | |
500 | /* trailing space padding */ | |
501 | while (--spec.field_width >= 0) { | |
502 | if (buf < end) | |
503 | *buf = ' '; | |
504 | ++buf; | |
505 | } | |
506 | ||
507 | return buf; | |
508 | } | |
509 | ||
510 | static noinline_for_stack | |
511 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
512 | { | |
513 | int len, i; | |
514 | ||
515 | if ((unsigned long)s < PAGE_SIZE) | |
516 | s = "(null)"; | |
517 | ||
518 | len = strnlen(s, spec.precision); | |
519 | ||
520 | if (!(spec.flags & LEFT)) { | |
521 | while (len < spec.field_width--) { | |
522 | if (buf < end) | |
523 | *buf = ' '; | |
524 | ++buf; | |
525 | } | |
526 | } | |
527 | for (i = 0; i < len; ++i) { | |
528 | if (buf < end) | |
529 | *buf = *s; | |
530 | ++buf; ++s; | |
531 | } | |
532 | while (len < spec.field_width--) { | |
533 | if (buf < end) | |
534 | *buf = ' '; | |
535 | ++buf; | |
536 | } | |
537 | ||
538 | return buf; | |
539 | } | |
540 | ||
541 | static void widen(char *buf, char *end, unsigned len, unsigned spaces) | |
542 | { | |
543 | size_t size; | |
544 | if (buf >= end) /* nowhere to put anything */ | |
545 | return; | |
546 | size = end - buf; | |
547 | if (size <= spaces) { | |
548 | memset(buf, ' ', size); | |
549 | return; | |
550 | } | |
551 | if (len) { | |
552 | if (len > size - spaces) | |
553 | len = size - spaces; | |
554 | memmove(buf + spaces, buf, len); | |
555 | } | |
556 | memset(buf, ' ', spaces); | |
557 | } | |
558 | ||
559 | static noinline_for_stack | |
560 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
561 | const char *fmt) | |
562 | { | |
563 | const char *array[4], *s; | |
564 | const struct dentry *p; | |
565 | int depth; | |
566 | int i, n; | |
567 | ||
568 | switch (fmt[1]) { | |
569 | case '2': case '3': case '4': | |
570 | depth = fmt[1] - '0'; | |
571 | break; | |
572 | default: | |
573 | depth = 1; | |
574 | } | |
575 | ||
576 | rcu_read_lock(); | |
577 | for (i = 0; i < depth; i++, d = p) { | |
578 | p = ACCESS_ONCE(d->d_parent); | |
579 | array[i] = ACCESS_ONCE(d->d_name.name); | |
580 | if (p == d) { | |
581 | if (i) | |
582 | array[i] = ""; | |
583 | i++; | |
584 | break; | |
585 | } | |
586 | } | |
587 | s = array[--i]; | |
588 | for (n = 0; n != spec.precision; n++, buf++) { | |
589 | char c = *s++; | |
590 | if (!c) { | |
591 | if (!i) | |
592 | break; | |
593 | c = '/'; | |
594 | s = array[--i]; | |
595 | } | |
596 | if (buf < end) | |
597 | *buf = c; | |
598 | } | |
599 | rcu_read_unlock(); | |
600 | if (n < spec.field_width) { | |
601 | /* we want to pad the sucker */ | |
602 | unsigned spaces = spec.field_width - n; | |
603 | if (!(spec.flags & LEFT)) { | |
604 | widen(buf - n, end, n, spaces); | |
605 | return buf + spaces; | |
606 | } | |
607 | while (spaces--) { | |
608 | if (buf < end) | |
609 | *buf = ' '; | |
610 | ++buf; | |
611 | } | |
612 | } | |
613 | return buf; | |
614 | } | |
615 | ||
616 | static noinline_for_stack | |
617 | char *symbol_string(char *buf, char *end, void *ptr, | |
618 | struct printf_spec spec, const char *fmt) | |
619 | { | |
620 | unsigned long value; | |
621 | #ifdef CONFIG_KALLSYMS | |
622 | char sym[KSYM_SYMBOL_LEN]; | |
623 | #endif | |
624 | ||
625 | if (fmt[1] == 'R') | |
626 | ptr = __builtin_extract_return_addr(ptr); | |
627 | value = (unsigned long)ptr; | |
628 | ||
629 | #ifdef CONFIG_KALLSYMS | |
630 | if (*fmt == 'B') | |
631 | sprint_backtrace(sym, value); | |
632 | else if (*fmt != 'f' && *fmt != 's') | |
633 | sprint_symbol(sym, value); | |
634 | else | |
635 | sprint_symbol_no_offset(sym, value); | |
636 | ||
637 | return string(buf, end, sym, spec); | |
638 | #else | |
639 | spec.field_width = 2 * sizeof(void *); | |
640 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
641 | spec.base = 16; | |
642 | ||
643 | return number(buf, end, value, spec); | |
644 | #endif | |
645 | } | |
646 | ||
647 | static noinline_for_stack | |
648 | char *resource_string(char *buf, char *end, struct resource *res, | |
649 | struct printf_spec spec, const char *fmt) | |
650 | { | |
651 | #ifndef IO_RSRC_PRINTK_SIZE | |
652 | #define IO_RSRC_PRINTK_SIZE 6 | |
653 | #endif | |
654 | ||
655 | #ifndef MEM_RSRC_PRINTK_SIZE | |
656 | #define MEM_RSRC_PRINTK_SIZE 10 | |
657 | #endif | |
658 | static const struct printf_spec io_spec = { | |
659 | .base = 16, | |
660 | .field_width = IO_RSRC_PRINTK_SIZE, | |
661 | .precision = -1, | |
662 | .flags = SPECIAL | SMALL | ZEROPAD, | |
663 | }; | |
664 | static const struct printf_spec mem_spec = { | |
665 | .base = 16, | |
666 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
667 | .precision = -1, | |
668 | .flags = SPECIAL | SMALL | ZEROPAD, | |
669 | }; | |
670 | static const struct printf_spec bus_spec = { | |
671 | .base = 16, | |
672 | .field_width = 2, | |
673 | .precision = -1, | |
674 | .flags = SMALL | ZEROPAD, | |
675 | }; | |
676 | static const struct printf_spec dec_spec = { | |
677 | .base = 10, | |
678 | .precision = -1, | |
679 | .flags = 0, | |
680 | }; | |
681 | static const struct printf_spec str_spec = { | |
682 | .field_width = -1, | |
683 | .precision = 10, | |
684 | .flags = LEFT, | |
685 | }; | |
686 | static const struct printf_spec flag_spec = { | |
687 | .base = 16, | |
688 | .precision = -1, | |
689 | .flags = SPECIAL | SMALL, | |
690 | }; | |
691 | ||
692 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
693 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
694 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
695 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
696 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") | |
697 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") | |
698 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
699 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
700 | ||
701 | char *p = sym, *pend = sym + sizeof(sym); | |
702 | int decode = (fmt[0] == 'R') ? 1 : 0; | |
703 | const struct printf_spec *specp; | |
704 | ||
705 | *p++ = '['; | |
706 | if (res->flags & IORESOURCE_IO) { | |
707 | p = string(p, pend, "io ", str_spec); | |
708 | specp = &io_spec; | |
709 | } else if (res->flags & IORESOURCE_MEM) { | |
710 | p = string(p, pend, "mem ", str_spec); | |
711 | specp = &mem_spec; | |
712 | } else if (res->flags & IORESOURCE_IRQ) { | |
713 | p = string(p, pend, "irq ", str_spec); | |
714 | specp = &dec_spec; | |
715 | } else if (res->flags & IORESOURCE_DMA) { | |
716 | p = string(p, pend, "dma ", str_spec); | |
717 | specp = &dec_spec; | |
718 | } else if (res->flags & IORESOURCE_BUS) { | |
719 | p = string(p, pend, "bus ", str_spec); | |
720 | specp = &bus_spec; | |
721 | } else { | |
722 | p = string(p, pend, "??? ", str_spec); | |
723 | specp = &mem_spec; | |
724 | decode = 0; | |
725 | } | |
726 | if (decode && res->flags & IORESOURCE_UNSET) { | |
727 | p = string(p, pend, "size ", str_spec); | |
728 | p = number(p, pend, resource_size(res), *specp); | |
729 | } else { | |
730 | p = number(p, pend, res->start, *specp); | |
731 | if (res->start != res->end) { | |
732 | *p++ = '-'; | |
733 | p = number(p, pend, res->end, *specp); | |
734 | } | |
735 | } | |
736 | if (decode) { | |
737 | if (res->flags & IORESOURCE_MEM_64) | |
738 | p = string(p, pend, " 64bit", str_spec); | |
739 | if (res->flags & IORESOURCE_PREFETCH) | |
740 | p = string(p, pend, " pref", str_spec); | |
741 | if (res->flags & IORESOURCE_WINDOW) | |
742 | p = string(p, pend, " window", str_spec); | |
743 | if (res->flags & IORESOURCE_DISABLED) | |
744 | p = string(p, pend, " disabled", str_spec); | |
745 | } else { | |
746 | p = string(p, pend, " flags ", str_spec); | |
747 | p = number(p, pend, res->flags, flag_spec); | |
748 | } | |
749 | *p++ = ']'; | |
750 | *p = '\0'; | |
751 | ||
752 | return string(buf, end, sym, spec); | |
753 | } | |
754 | ||
755 | static noinline_for_stack | |
756 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
757 | const char *fmt) | |
758 | { | |
759 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains | |
760 | negative value, fallback to the default */ | |
761 | char separator; | |
762 | ||
763 | if (spec.field_width == 0) | |
764 | /* nothing to print */ | |
765 | return buf; | |
766 | ||
767 | if (ZERO_OR_NULL_PTR(addr)) | |
768 | /* NULL pointer */ | |
769 | return string(buf, end, NULL, spec); | |
770 | ||
771 | switch (fmt[1]) { | |
772 | case 'C': | |
773 | separator = ':'; | |
774 | break; | |
775 | case 'D': | |
776 | separator = '-'; | |
777 | break; | |
778 | case 'N': | |
779 | separator = 0; | |
780 | break; | |
781 | default: | |
782 | separator = ' '; | |
783 | break; | |
784 | } | |
785 | ||
786 | if (spec.field_width > 0) | |
787 | len = min_t(int, spec.field_width, 64); | |
788 | ||
789 | for (i = 0; i < len; ++i) { | |
790 | if (buf < end) | |
791 | *buf = hex_asc_hi(addr[i]); | |
792 | ++buf; | |
793 | if (buf < end) | |
794 | *buf = hex_asc_lo(addr[i]); | |
795 | ++buf; | |
796 | ||
797 | if (separator && i != len - 1) { | |
798 | if (buf < end) | |
799 | *buf = separator; | |
800 | ++buf; | |
801 | } | |
802 | } | |
803 | ||
804 | return buf; | |
805 | } | |
806 | ||
807 | static noinline_for_stack | |
808 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
809 | struct printf_spec spec, const char *fmt) | |
810 | { | |
811 | const int CHUNKSZ = 32; | |
812 | int nr_bits = max_t(int, spec.field_width, 0); | |
813 | int i, chunksz; | |
814 | bool first = true; | |
815 | ||
816 | /* reused to print numbers */ | |
817 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
818 | ||
819 | chunksz = nr_bits & (CHUNKSZ - 1); | |
820 | if (chunksz == 0) | |
821 | chunksz = CHUNKSZ; | |
822 | ||
823 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
824 | for (; i >= 0; i -= CHUNKSZ) { | |
825 | u32 chunkmask, val; | |
826 | int word, bit; | |
827 | ||
828 | chunkmask = ((1ULL << chunksz) - 1); | |
829 | word = i / BITS_PER_LONG; | |
830 | bit = i % BITS_PER_LONG; | |
831 | val = (bitmap[word] >> bit) & chunkmask; | |
832 | ||
833 | if (!first) { | |
834 | if (buf < end) | |
835 | *buf = ','; | |
836 | buf++; | |
837 | } | |
838 | first = false; | |
839 | ||
840 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
841 | buf = number(buf, end, val, spec); | |
842 | ||
843 | chunksz = CHUNKSZ; | |
844 | } | |
845 | return buf; | |
846 | } | |
847 | ||
848 | static noinline_for_stack | |
849 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
850 | struct printf_spec spec, const char *fmt) | |
851 | { | |
852 | int nr_bits = max_t(int, spec.field_width, 0); | |
853 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
854 | int cur, rbot, rtop; | |
855 | bool first = true; | |
856 | ||
857 | /* reused to print numbers */ | |
858 | spec = (struct printf_spec){ .base = 10 }; | |
859 | ||
860 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
861 | while (cur < nr_bits) { | |
862 | rtop = cur; | |
863 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
864 | if (cur < nr_bits && cur <= rtop + 1) | |
865 | continue; | |
866 | ||
867 | if (!first) { | |
868 | if (buf < end) | |
869 | *buf = ','; | |
870 | buf++; | |
871 | } | |
872 | first = false; | |
873 | ||
874 | buf = number(buf, end, rbot, spec); | |
875 | if (rbot < rtop) { | |
876 | if (buf < end) | |
877 | *buf = '-'; | |
878 | buf++; | |
879 | ||
880 | buf = number(buf, end, rtop, spec); | |
881 | } | |
882 | ||
883 | rbot = cur; | |
884 | } | |
885 | return buf; | |
886 | } | |
887 | ||
888 | static noinline_for_stack | |
889 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
890 | struct printf_spec spec, const char *fmt) | |
891 | { | |
892 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; | |
893 | char *p = mac_addr; | |
894 | int i; | |
895 | char separator; | |
896 | bool reversed = false; | |
897 | ||
898 | switch (fmt[1]) { | |
899 | case 'F': | |
900 | separator = '-'; | |
901 | break; | |
902 | ||
903 | case 'R': | |
904 | reversed = true; | |
905 | /* fall through */ | |
906 | ||
907 | default: | |
908 | separator = ':'; | |
909 | break; | |
910 | } | |
911 | ||
912 | for (i = 0; i < 6; i++) { | |
913 | if (reversed) | |
914 | p = hex_byte_pack(p, addr[5 - i]); | |
915 | else | |
916 | p = hex_byte_pack(p, addr[i]); | |
917 | ||
918 | if (fmt[0] == 'M' && i != 5) | |
919 | *p++ = separator; | |
920 | } | |
921 | *p = '\0'; | |
922 | ||
923 | return string(buf, end, mac_addr, spec); | |
924 | } | |
925 | ||
926 | static noinline_for_stack | |
927 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
928 | { | |
929 | int i; | |
930 | bool leading_zeros = (fmt[0] == 'i'); | |
931 | int index; | |
932 | int step; | |
933 | ||
934 | switch (fmt[2]) { | |
935 | case 'h': | |
936 | #ifdef __BIG_ENDIAN | |
937 | index = 0; | |
938 | step = 1; | |
939 | #else | |
940 | index = 3; | |
941 | step = -1; | |
942 | #endif | |
943 | break; | |
944 | case 'l': | |
945 | index = 3; | |
946 | step = -1; | |
947 | break; | |
948 | case 'n': | |
949 | case 'b': | |
950 | default: | |
951 | index = 0; | |
952 | step = 1; | |
953 | break; | |
954 | } | |
955 | for (i = 0; i < 4; i++) { | |
956 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ | |
957 | int digits = put_dec_trunc8(temp, addr[index]) - temp; | |
958 | if (leading_zeros) { | |
959 | if (digits < 3) | |
960 | *p++ = '0'; | |
961 | if (digits < 2) | |
962 | *p++ = '0'; | |
963 | } | |
964 | /* reverse the digits in the quad */ | |
965 | while (digits--) | |
966 | *p++ = temp[digits]; | |
967 | if (i < 3) | |
968 | *p++ = '.'; | |
969 | index += step; | |
970 | } | |
971 | *p = '\0'; | |
972 | ||
973 | return p; | |
974 | } | |
975 | ||
976 | static noinline_for_stack | |
977 | char *ip6_compressed_string(char *p, const char *addr) | |
978 | { | |
979 | int i, j, range; | |
980 | unsigned char zerolength[8]; | |
981 | int longest = 1; | |
982 | int colonpos = -1; | |
983 | u16 word; | |
984 | u8 hi, lo; | |
985 | bool needcolon = false; | |
986 | bool useIPv4; | |
987 | struct in6_addr in6; | |
988 | ||
989 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
990 | ||
991 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
992 | ||
993 | memset(zerolength, 0, sizeof(zerolength)); | |
994 | ||
995 | if (useIPv4) | |
996 | range = 6; | |
997 | else | |
998 | range = 8; | |
999 | ||
1000 | /* find position of longest 0 run */ | |
1001 | for (i = 0; i < range; i++) { | |
1002 | for (j = i; j < range; j++) { | |
1003 | if (in6.s6_addr16[j] != 0) | |
1004 | break; | |
1005 | zerolength[i]++; | |
1006 | } | |
1007 | } | |
1008 | for (i = 0; i < range; i++) { | |
1009 | if (zerolength[i] > longest) { | |
1010 | longest = zerolength[i]; | |
1011 | colonpos = i; | |
1012 | } | |
1013 | } | |
1014 | if (longest == 1) /* don't compress a single 0 */ | |
1015 | colonpos = -1; | |
1016 | ||
1017 | /* emit address */ | |
1018 | for (i = 0; i < range; i++) { | |
1019 | if (i == colonpos) { | |
1020 | if (needcolon || i == 0) | |
1021 | *p++ = ':'; | |
1022 | *p++ = ':'; | |
1023 | needcolon = false; | |
1024 | i += longest - 1; | |
1025 | continue; | |
1026 | } | |
1027 | if (needcolon) { | |
1028 | *p++ = ':'; | |
1029 | needcolon = false; | |
1030 | } | |
1031 | /* hex u16 without leading 0s */ | |
1032 | word = ntohs(in6.s6_addr16[i]); | |
1033 | hi = word >> 8; | |
1034 | lo = word & 0xff; | |
1035 | if (hi) { | |
1036 | if (hi > 0x0f) | |
1037 | p = hex_byte_pack(p, hi); | |
1038 | else | |
1039 | *p++ = hex_asc_lo(hi); | |
1040 | p = hex_byte_pack(p, lo); | |
1041 | } | |
1042 | else if (lo > 0x0f) | |
1043 | p = hex_byte_pack(p, lo); | |
1044 | else | |
1045 | *p++ = hex_asc_lo(lo); | |
1046 | needcolon = true; | |
1047 | } | |
1048 | ||
1049 | if (useIPv4) { | |
1050 | if (needcolon) | |
1051 | *p++ = ':'; | |
1052 | p = ip4_string(p, &in6.s6_addr[12], "I4"); | |
1053 | } | |
1054 | *p = '\0'; | |
1055 | ||
1056 | return p; | |
1057 | } | |
1058 | ||
1059 | static noinline_for_stack | |
1060 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
1061 | { | |
1062 | int i; | |
1063 | ||
1064 | for (i = 0; i < 8; i++) { | |
1065 | p = hex_byte_pack(p, *addr++); | |
1066 | p = hex_byte_pack(p, *addr++); | |
1067 | if (fmt[0] == 'I' && i != 7) | |
1068 | *p++ = ':'; | |
1069 | } | |
1070 | *p = '\0'; | |
1071 | ||
1072 | return p; | |
1073 | } | |
1074 | ||
1075 | static noinline_for_stack | |
1076 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1077 | struct printf_spec spec, const char *fmt) | |
1078 | { | |
1079 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1080 | ||
1081 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
1082 | ip6_compressed_string(ip6_addr, addr); | |
1083 | else | |
1084 | ip6_string(ip6_addr, addr, fmt); | |
1085 | ||
1086 | return string(buf, end, ip6_addr, spec); | |
1087 | } | |
1088 | ||
1089 | static noinline_for_stack | |
1090 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1091 | struct printf_spec spec, const char *fmt) | |
1092 | { | |
1093 | char ip4_addr[sizeof("255.255.255.255")]; | |
1094 | ||
1095 | ip4_string(ip4_addr, addr, fmt); | |
1096 | ||
1097 | return string(buf, end, ip4_addr, spec); | |
1098 | } | |
1099 | ||
1100 | static noinline_for_stack | |
1101 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1102 | struct printf_spec spec, const char *fmt) | |
1103 | { | |
1104 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1105 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1106 | sizeof(":12345") + sizeof("/123456789") + | |
1107 | sizeof("%1234567890")]; | |
1108 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1109 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1110 | char fmt6[2] = { fmt[0], '6' }; | |
1111 | u8 off = 0; | |
1112 | ||
1113 | fmt++; | |
1114 | while (isalpha(*++fmt)) { | |
1115 | switch (*fmt) { | |
1116 | case 'p': | |
1117 | have_p = true; | |
1118 | break; | |
1119 | case 'f': | |
1120 | have_f = true; | |
1121 | break; | |
1122 | case 's': | |
1123 | have_s = true; | |
1124 | break; | |
1125 | case 'c': | |
1126 | have_c = true; | |
1127 | break; | |
1128 | } | |
1129 | } | |
1130 | ||
1131 | if (have_p || have_s || have_f) { | |
1132 | *p = '['; | |
1133 | off = 1; | |
1134 | } | |
1135 | ||
1136 | if (fmt6[0] == 'I' && have_c) | |
1137 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1138 | else | |
1139 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1140 | ||
1141 | if (have_p || have_s || have_f) | |
1142 | *p++ = ']'; | |
1143 | ||
1144 | if (have_p) { | |
1145 | *p++ = ':'; | |
1146 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1147 | } | |
1148 | if (have_f) { | |
1149 | *p++ = '/'; | |
1150 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1151 | IPV6_FLOWINFO_MASK), spec); | |
1152 | } | |
1153 | if (have_s) { | |
1154 | *p++ = '%'; | |
1155 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1156 | } | |
1157 | *p = '\0'; | |
1158 | ||
1159 | return string(buf, end, ip6_addr, spec); | |
1160 | } | |
1161 | ||
1162 | static noinline_for_stack | |
1163 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1164 | struct printf_spec spec, const char *fmt) | |
1165 | { | |
1166 | bool have_p = false; | |
1167 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1168 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1169 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1170 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1171 | ||
1172 | fmt++; | |
1173 | while (isalpha(*++fmt)) { | |
1174 | switch (*fmt) { | |
1175 | case 'p': | |
1176 | have_p = true; | |
1177 | break; | |
1178 | case 'h': | |
1179 | case 'l': | |
1180 | case 'n': | |
1181 | case 'b': | |
1182 | fmt4[2] = *fmt; | |
1183 | break; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | p = ip4_string(ip4_addr, addr, fmt4); | |
1188 | if (have_p) { | |
1189 | *p++ = ':'; | |
1190 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1191 | } | |
1192 | *p = '\0'; | |
1193 | ||
1194 | return string(buf, end, ip4_addr, spec); | |
1195 | } | |
1196 | ||
1197 | static noinline_for_stack | |
1198 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1199 | const char *fmt) | |
1200 | { | |
1201 | bool found = true; | |
1202 | int count = 1; | |
1203 | unsigned int flags = 0; | |
1204 | int len; | |
1205 | ||
1206 | if (spec.field_width == 0) | |
1207 | return buf; /* nothing to print */ | |
1208 | ||
1209 | if (ZERO_OR_NULL_PTR(addr)) | |
1210 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1211 | ||
1212 | ||
1213 | do { | |
1214 | switch (fmt[count++]) { | |
1215 | case 'a': | |
1216 | flags |= ESCAPE_ANY; | |
1217 | break; | |
1218 | case 'c': | |
1219 | flags |= ESCAPE_SPECIAL; | |
1220 | break; | |
1221 | case 'h': | |
1222 | flags |= ESCAPE_HEX; | |
1223 | break; | |
1224 | case 'n': | |
1225 | flags |= ESCAPE_NULL; | |
1226 | break; | |
1227 | case 'o': | |
1228 | flags |= ESCAPE_OCTAL; | |
1229 | break; | |
1230 | case 'p': | |
1231 | flags |= ESCAPE_NP; | |
1232 | break; | |
1233 | case 's': | |
1234 | flags |= ESCAPE_SPACE; | |
1235 | break; | |
1236 | default: | |
1237 | found = false; | |
1238 | break; | |
1239 | } | |
1240 | } while (found); | |
1241 | ||
1242 | if (!flags) | |
1243 | flags = ESCAPE_ANY_NP; | |
1244 | ||
1245 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1246 | ||
1247 | /* | |
1248 | * string_escape_mem() writes as many characters as it can to | |
1249 | * the given buffer, and returns the total size of the output | |
1250 | * had the buffer been big enough. | |
1251 | */ | |
1252 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
1253 | ||
1254 | return buf; | |
1255 | } | |
1256 | ||
1257 | static noinline_for_stack | |
1258 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1259 | struct printf_spec spec, const char *fmt) | |
1260 | { | |
1261 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1262 | char *p = uuid; | |
1263 | int i; | |
1264 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1265 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1266 | const u8 *index = be; | |
1267 | bool uc = false; | |
1268 | ||
1269 | switch (*(++fmt)) { | |
1270 | case 'L': | |
1271 | uc = true; /* fall-through */ | |
1272 | case 'l': | |
1273 | index = le; | |
1274 | break; | |
1275 | case 'B': | |
1276 | uc = true; | |
1277 | break; | |
1278 | } | |
1279 | ||
1280 | for (i = 0; i < 16; i++) { | |
1281 | p = hex_byte_pack(p, addr[index[i]]); | |
1282 | switch (i) { | |
1283 | case 3: | |
1284 | case 5: | |
1285 | case 7: | |
1286 | case 9: | |
1287 | *p++ = '-'; | |
1288 | break; | |
1289 | } | |
1290 | } | |
1291 | ||
1292 | *p = 0; | |
1293 | ||
1294 | if (uc) { | |
1295 | p = uuid; | |
1296 | do { | |
1297 | *p = toupper(*p); | |
1298 | } while (*(++p)); | |
1299 | } | |
1300 | ||
1301 | return string(buf, end, uuid, spec); | |
1302 | } | |
1303 | ||
1304 | static | |
1305 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1306 | struct printf_spec spec) | |
1307 | { | |
1308 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1309 | if (spec.field_width == -1) | |
1310 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1311 | spec.base = 16; | |
1312 | ||
1313 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1314 | } | |
1315 | ||
1316 | static noinline_for_stack | |
1317 | char *address_val(char *buf, char *end, const void *addr, | |
1318 | struct printf_spec spec, const char *fmt) | |
1319 | { | |
1320 | unsigned long long num; | |
1321 | ||
1322 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1323 | spec.base = 16; | |
1324 | ||
1325 | switch (fmt[1]) { | |
1326 | case 'd': | |
1327 | num = *(const dma_addr_t *)addr; | |
1328 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1329 | break; | |
1330 | case 'p': | |
1331 | default: | |
1332 | num = *(const phys_addr_t *)addr; | |
1333 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1334 | break; | |
1335 | } | |
1336 | ||
1337 | return number(buf, end, num, spec); | |
1338 | } | |
1339 | ||
1340 | static noinline_for_stack | |
1341 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1342 | const char *fmt) | |
1343 | { | |
1344 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1345 | return string(buf, end, NULL, spec); | |
1346 | ||
1347 | switch (fmt[1]) { | |
1348 | case 'r': | |
1349 | return number(buf, end, clk_get_rate(clk), spec); | |
1350 | ||
1351 | case 'n': | |
1352 | default: | |
1353 | #ifdef CONFIG_COMMON_CLK | |
1354 | return string(buf, end, __clk_get_name(clk), spec); | |
1355 | #else | |
1356 | spec.base = 16; | |
1357 | spec.field_width = sizeof(unsigned long) * 2 + 2; | |
1358 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1359 | return number(buf, end, (unsigned long)clk, spec); | |
1360 | #endif | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | int kptr_restrict __read_mostly; | |
1365 | ||
1366 | /* | |
1367 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1368 | * by an extra set of alphanumeric characters that are extended format | |
1369 | * specifiers. | |
1370 | * | |
1371 | * Right now we handle: | |
1372 | * | |
1373 | * - 'F' For symbolic function descriptor pointers with offset | |
1374 | * - 'f' For simple symbolic function names without offset | |
1375 | * - 'S' For symbolic direct pointers with offset | |
1376 | * - 's' For symbolic direct pointers without offset | |
1377 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation | |
1378 | * - 'B' For backtraced symbolic direct pointers with offset | |
1379 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] | |
1380 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
1381 | * - 'b[l]' For a bitmap, the number of bits is determined by the field | |
1382 | * width which must be explicitly specified either as part of the | |
1383 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1384 | * range-list format instead of hex format | |
1385 | * - 'M' For a 6-byte MAC address, it prints the address in the | |
1386 | * usual colon-separated hex notation | |
1387 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons | |
1388 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address | |
1389 | * with a dash-separated hex notation | |
1390 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) | |
1391 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way | |
1392 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1393 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
1394 | * [S][pfs] | |
1395 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1396 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1397 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
1398 | * IPv6 omits the colons (01020304...0f) | |
1399 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
1400 | * [S][pfs] | |
1401 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1402 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1403 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1404 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
1405 | * http://tools.ietf.org/html/rfc5952 | |
1406 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination | |
1407 | * of the following flags (see string_escape_mem() for the | |
1408 | * details): | |
1409 | * a - ESCAPE_ANY | |
1410 | * c - ESCAPE_SPECIAL | |
1411 | * h - ESCAPE_HEX | |
1412 | * n - ESCAPE_NULL | |
1413 | * o - ESCAPE_OCTAL | |
1414 | * p - ESCAPE_NP | |
1415 | * s - ESCAPE_SPACE | |
1416 | * By default ESCAPE_ANY_NP is used. | |
1417 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form | |
1418 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1419 | * Options for %pU are: | |
1420 | * b big endian lower case hex (default) | |
1421 | * B big endian UPPER case hex | |
1422 | * l little endian lower case hex | |
1423 | * L little endian UPPER case hex | |
1424 | * big endian output byte order is: | |
1425 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1426 | * little endian output byte order is: | |
1427 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
1428 | * - 'V' For a struct va_format which contains a format string * and va_list *, | |
1429 | * call vsnprintf(->format, *->va_list). | |
1430 | * Implements a "recursive vsnprintf". | |
1431 | * Do not use this feature without some mechanism to verify the | |
1432 | * correctness of the format string and va_list arguments. | |
1433 | * - 'K' For a kernel pointer that should be hidden from unprivileged users | |
1434 | * - 'NF' For a netdev_features_t | |
1435 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with | |
1436 | * a certain separator (' ' by default): | |
1437 | * C colon | |
1438 | * D dash | |
1439 | * N no separator | |
1440 | * The maximum supported length is 64 bytes of the input. Consider | |
1441 | * to use print_hex_dump() for the larger input. | |
1442 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives | |
1443 | * (default assumed to be phys_addr_t, passed by reference) | |
1444 | * - 'd[234]' For a dentry name (optionally 2-4 last components) | |
1445 | * - 'D[234]' Same as 'd' but for a struct file | |
1446 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address | |
1447 | * (legacy clock framework) of the clock | |
1448 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1449 | * (legacy clock framework) of the clock | |
1450 | * - 'Cr' For a clock, it prints the current rate of the clock | |
1451 | * | |
1452 | * ** Please update also Documentation/printk-formats.txt when making changes ** | |
1453 | * | |
1454 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 | |
1455 | * function pointers are really function descriptors, which contain a | |
1456 | * pointer to the real address. | |
1457 | */ | |
1458 | static noinline_for_stack | |
1459 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1460 | struct printf_spec spec) | |
1461 | { | |
1462 | const int default_width = 2 * sizeof(void *); | |
1463 | ||
1464 | if (!ptr && *fmt != 'K') { | |
1465 | /* | |
1466 | * Print (null) with the same width as a pointer so it makes | |
1467 | * tabular output look nice. | |
1468 | */ | |
1469 | if (spec.field_width == -1) | |
1470 | spec.field_width = default_width; | |
1471 | return string(buf, end, "(null)", spec); | |
1472 | } | |
1473 | ||
1474 | switch (*fmt) { | |
1475 | case 'F': | |
1476 | case 'f': | |
1477 | ptr = dereference_function_descriptor(ptr); | |
1478 | /* Fallthrough */ | |
1479 | case 'S': | |
1480 | case 's': | |
1481 | case 'B': | |
1482 | return symbol_string(buf, end, ptr, spec, fmt); | |
1483 | case 'R': | |
1484 | case 'r': | |
1485 | return resource_string(buf, end, ptr, spec, fmt); | |
1486 | case 'h': | |
1487 | return hex_string(buf, end, ptr, spec, fmt); | |
1488 | case 'b': | |
1489 | switch (fmt[1]) { | |
1490 | case 'l': | |
1491 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1492 | default: | |
1493 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1494 | } | |
1495 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ | |
1496 | case 'm': /* Contiguous: 000102030405 */ | |
1497 | /* [mM]F (FDDI) */ | |
1498 | /* [mM]R (Reverse order; Bluetooth) */ | |
1499 | return mac_address_string(buf, end, ptr, spec, fmt); | |
1500 | case 'I': /* Formatted IP supported | |
1501 | * 4: 1.2.3.4 | |
1502 | * 6: 0001:0203:...:0708 | |
1503 | * 6c: 1::708 or 1::1.2.3.4 | |
1504 | */ | |
1505 | case 'i': /* Contiguous: | |
1506 | * 4: 001.002.003.004 | |
1507 | * 6: 000102...0f | |
1508 | */ | |
1509 | switch (fmt[1]) { | |
1510 | case '6': | |
1511 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1512 | case '4': | |
1513 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
1514 | case 'S': { | |
1515 | const union { | |
1516 | struct sockaddr raw; | |
1517 | struct sockaddr_in v4; | |
1518 | struct sockaddr_in6 v6; | |
1519 | } *sa = ptr; | |
1520 | ||
1521 | switch (sa->raw.sa_family) { | |
1522 | case AF_INET: | |
1523 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1524 | case AF_INET6: | |
1525 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1526 | default: | |
1527 | return string(buf, end, "(invalid address)", spec); | |
1528 | }} | |
1529 | } | |
1530 | break; | |
1531 | case 'E': | |
1532 | return escaped_string(buf, end, ptr, spec, fmt); | |
1533 | case 'U': | |
1534 | return uuid_string(buf, end, ptr, spec, fmt); | |
1535 | case 'V': | |
1536 | { | |
1537 | va_list va; | |
1538 | ||
1539 | va_copy(va, *((struct va_format *)ptr)->va); | |
1540 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1541 | ((struct va_format *)ptr)->fmt, va); | |
1542 | va_end(va); | |
1543 | return buf; | |
1544 | } | |
1545 | case 'K': | |
1546 | /* | |
1547 | * %pK cannot be used in IRQ context because its test | |
1548 | * for CAP_SYSLOG would be meaningless. | |
1549 | */ | |
1550 | if (kptr_restrict && (in_irq() || in_serving_softirq() || | |
1551 | in_nmi())) { | |
1552 | if (spec.field_width == -1) | |
1553 | spec.field_width = default_width; | |
1554 | return string(buf, end, "pK-error", spec); | |
1555 | } | |
1556 | ||
1557 | switch (kptr_restrict) { | |
1558 | case 0: | |
1559 | /* Always print %pK values */ | |
1560 | break; | |
1561 | case 1: { | |
1562 | /* | |
1563 | * Only print the real pointer value if the current | |
1564 | * process has CAP_SYSLOG and is running with the | |
1565 | * same credentials it started with. This is because | |
1566 | * access to files is checked at open() time, but %pK | |
1567 | * checks permission at read() time. We don't want to | |
1568 | * leak pointer values if a binary opens a file using | |
1569 | * %pK and then elevates privileges before reading it. | |
1570 | */ | |
1571 | const struct cred *cred = current_cred(); | |
1572 | ||
1573 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1574 | !uid_eq(cred->euid, cred->uid) || | |
1575 | !gid_eq(cred->egid, cred->gid)) | |
1576 | ptr = NULL; | |
1577 | break; | |
1578 | } | |
1579 | case 2: | |
1580 | default: | |
1581 | /* Always print 0's for %pK */ | |
1582 | ptr = NULL; | |
1583 | break; | |
1584 | } | |
1585 | break; | |
1586 | ||
1587 | case 'N': | |
1588 | switch (fmt[1]) { | |
1589 | case 'F': | |
1590 | return netdev_feature_string(buf, end, ptr, spec); | |
1591 | } | |
1592 | break; | |
1593 | case 'a': | |
1594 | return address_val(buf, end, ptr, spec, fmt); | |
1595 | case 'd': | |
1596 | return dentry_name(buf, end, ptr, spec, fmt); | |
1597 | case 'C': | |
1598 | return clock(buf, end, ptr, spec, fmt); | |
1599 | case 'D': | |
1600 | return dentry_name(buf, end, | |
1601 | ((const struct file *)ptr)->f_path.dentry, | |
1602 | spec, fmt); | |
1603 | } | |
1604 | spec.flags |= SMALL; | |
1605 | if (spec.field_width == -1) { | |
1606 | spec.field_width = default_width; | |
1607 | spec.flags |= ZEROPAD; | |
1608 | } | |
1609 | spec.base = 16; | |
1610 | ||
1611 | return number(buf, end, (unsigned long) ptr, spec); | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * Helper function to decode printf style format. | |
1616 | * Each call decode a token from the format and return the | |
1617 | * number of characters read (or likely the delta where it wants | |
1618 | * to go on the next call). | |
1619 | * The decoded token is returned through the parameters | |
1620 | * | |
1621 | * 'h', 'l', or 'L' for integer fields | |
1622 | * 'z' support added 23/7/1999 S.H. | |
1623 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1624 | * 't' added for ptrdiff_t | |
1625 | * | |
1626 | * @fmt: the format string | |
1627 | * @type of the token returned | |
1628 | * @flags: various flags such as +, -, # tokens.. | |
1629 | * @field_width: overwritten width | |
1630 | * @base: base of the number (octal, hex, ...) | |
1631 | * @precision: precision of a number | |
1632 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1633 | */ | |
1634 | static noinline_for_stack | |
1635 | int format_decode(const char *fmt, struct printf_spec *spec) | |
1636 | { | |
1637 | const char *start = fmt; | |
1638 | ||
1639 | /* we finished early by reading the field width */ | |
1640 | if (spec->type == FORMAT_TYPE_WIDTH) { | |
1641 | if (spec->field_width < 0) { | |
1642 | spec->field_width = -spec->field_width; | |
1643 | spec->flags |= LEFT; | |
1644 | } | |
1645 | spec->type = FORMAT_TYPE_NONE; | |
1646 | goto precision; | |
1647 | } | |
1648 | ||
1649 | /* we finished early by reading the precision */ | |
1650 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1651 | if (spec->precision < 0) | |
1652 | spec->precision = 0; | |
1653 | ||
1654 | spec->type = FORMAT_TYPE_NONE; | |
1655 | goto qualifier; | |
1656 | } | |
1657 | ||
1658 | /* By default */ | |
1659 | spec->type = FORMAT_TYPE_NONE; | |
1660 | ||
1661 | for (; *fmt ; ++fmt) { | |
1662 | if (*fmt == '%') | |
1663 | break; | |
1664 | } | |
1665 | ||
1666 | /* Return the current non-format string */ | |
1667 | if (fmt != start || !*fmt) | |
1668 | return fmt - start; | |
1669 | ||
1670 | /* Process flags */ | |
1671 | spec->flags = 0; | |
1672 | ||
1673 | while (1) { /* this also skips first '%' */ | |
1674 | bool found = true; | |
1675 | ||
1676 | ++fmt; | |
1677 | ||
1678 | switch (*fmt) { | |
1679 | case '-': spec->flags |= LEFT; break; | |
1680 | case '+': spec->flags |= PLUS; break; | |
1681 | case ' ': spec->flags |= SPACE; break; | |
1682 | case '#': spec->flags |= SPECIAL; break; | |
1683 | case '0': spec->flags |= ZEROPAD; break; | |
1684 | default: found = false; | |
1685 | } | |
1686 | ||
1687 | if (!found) | |
1688 | break; | |
1689 | } | |
1690 | ||
1691 | /* get field width */ | |
1692 | spec->field_width = -1; | |
1693 | ||
1694 | if (isdigit(*fmt)) | |
1695 | spec->field_width = skip_atoi(&fmt); | |
1696 | else if (*fmt == '*') { | |
1697 | /* it's the next argument */ | |
1698 | spec->type = FORMAT_TYPE_WIDTH; | |
1699 | return ++fmt - start; | |
1700 | } | |
1701 | ||
1702 | precision: | |
1703 | /* get the precision */ | |
1704 | spec->precision = -1; | |
1705 | if (*fmt == '.') { | |
1706 | ++fmt; | |
1707 | if (isdigit(*fmt)) { | |
1708 | spec->precision = skip_atoi(&fmt); | |
1709 | if (spec->precision < 0) | |
1710 | spec->precision = 0; | |
1711 | } else if (*fmt == '*') { | |
1712 | /* it's the next argument */ | |
1713 | spec->type = FORMAT_TYPE_PRECISION; | |
1714 | return ++fmt - start; | |
1715 | } | |
1716 | } | |
1717 | ||
1718 | qualifier: | |
1719 | /* get the conversion qualifier */ | |
1720 | spec->qualifier = -1; | |
1721 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
1722 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
1723 | spec->qualifier = *fmt++; | |
1724 | if (unlikely(spec->qualifier == *fmt)) { | |
1725 | if (spec->qualifier == 'l') { | |
1726 | spec->qualifier = 'L'; | |
1727 | ++fmt; | |
1728 | } else if (spec->qualifier == 'h') { | |
1729 | spec->qualifier = 'H'; | |
1730 | ++fmt; | |
1731 | } | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | /* default base */ | |
1736 | spec->base = 10; | |
1737 | switch (*fmt) { | |
1738 | case 'c': | |
1739 | spec->type = FORMAT_TYPE_CHAR; | |
1740 | return ++fmt - start; | |
1741 | ||
1742 | case 's': | |
1743 | spec->type = FORMAT_TYPE_STR; | |
1744 | return ++fmt - start; | |
1745 | ||
1746 | case 'p': | |
1747 | spec->type = FORMAT_TYPE_PTR; | |
1748 | return ++fmt - start; | |
1749 | ||
1750 | case '%': | |
1751 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1752 | return ++fmt - start; | |
1753 | ||
1754 | /* integer number formats - set up the flags and "break" */ | |
1755 | case 'o': | |
1756 | spec->base = 8; | |
1757 | break; | |
1758 | ||
1759 | case 'x': | |
1760 | spec->flags |= SMALL; | |
1761 | ||
1762 | case 'X': | |
1763 | spec->base = 16; | |
1764 | break; | |
1765 | ||
1766 | case 'd': | |
1767 | case 'i': | |
1768 | spec->flags |= SIGN; | |
1769 | case 'u': | |
1770 | break; | |
1771 | ||
1772 | case 'n': | |
1773 | /* | |
1774 | * Since %n poses a greater security risk than | |
1775 | * utility, treat it as any other invalid or | |
1776 | * unsupported format specifier. | |
1777 | */ | |
1778 | /* Fall-through */ | |
1779 | ||
1780 | default: | |
1781 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); | |
1782 | spec->type = FORMAT_TYPE_INVALID; | |
1783 | return fmt - start; | |
1784 | } | |
1785 | ||
1786 | if (spec->qualifier == 'L') | |
1787 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1788 | else if (spec->qualifier == 'l') { | |
1789 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); | |
1790 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
1791 | } else if (_tolower(spec->qualifier) == 'z') { | |
1792 | spec->type = FORMAT_TYPE_SIZE_T; | |
1793 | } else if (spec->qualifier == 't') { | |
1794 | spec->type = FORMAT_TYPE_PTRDIFF; | |
1795 | } else if (spec->qualifier == 'H') { | |
1796 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); | |
1797 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
1798 | } else if (spec->qualifier == 'h') { | |
1799 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); | |
1800 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
1801 | } else { | |
1802 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); | |
1803 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
1804 | } | |
1805 | ||
1806 | return ++fmt - start; | |
1807 | } | |
1808 | ||
1809 | /** | |
1810 | * vsnprintf - Format a string and place it in a buffer | |
1811 | * @buf: The buffer to place the result into | |
1812 | * @size: The size of the buffer, including the trailing null space | |
1813 | * @fmt: The format string to use | |
1814 | * @args: Arguments for the format string | |
1815 | * | |
1816 | * This function generally follows C99 vsnprintf, but has some | |
1817 | * extensions and a few limitations: | |
1818 | * | |
1819 | * %n is unsupported | |
1820 | * %p* is handled by pointer() | |
1821 | * | |
1822 | * See pointer() or Documentation/printk-formats.txt for more | |
1823 | * extensive description. | |
1824 | * | |
1825 | * ** Please update the documentation in both places when making changes ** | |
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 | * If you're not already dealing with a va_list consider using snprintf(). | |
1836 | */ | |
1837 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1838 | { | |
1839 | unsigned long long num; | |
1840 | char *str, *end; | |
1841 | struct printf_spec spec = {0}; | |
1842 | ||
1843 | /* Reject out-of-range values early. Large positive sizes are | |
1844 | used for unknown buffer sizes. */ | |
1845 | if (WARN_ON_ONCE(size > INT_MAX)) | |
1846 | return 0; | |
1847 | ||
1848 | str = buf; | |
1849 | end = buf + size; | |
1850 | ||
1851 | /* Make sure end is always >= buf */ | |
1852 | if (end < buf) { | |
1853 | end = ((void *)-1); | |
1854 | size = end - buf; | |
1855 | } | |
1856 | ||
1857 | while (*fmt) { | |
1858 | const char *old_fmt = fmt; | |
1859 | int read = format_decode(fmt, &spec); | |
1860 | ||
1861 | fmt += read; | |
1862 | ||
1863 | switch (spec.type) { | |
1864 | case FORMAT_TYPE_NONE: { | |
1865 | int copy = read; | |
1866 | if (str < end) { | |
1867 | if (copy > end - str) | |
1868 | copy = end - str; | |
1869 | memcpy(str, old_fmt, copy); | |
1870 | } | |
1871 | str += read; | |
1872 | break; | |
1873 | } | |
1874 | ||
1875 | case FORMAT_TYPE_WIDTH: | |
1876 | spec.field_width = va_arg(args, int); | |
1877 | break; | |
1878 | ||
1879 | case FORMAT_TYPE_PRECISION: | |
1880 | spec.precision = va_arg(args, int); | |
1881 | break; | |
1882 | ||
1883 | case FORMAT_TYPE_CHAR: { | |
1884 | char c; | |
1885 | ||
1886 | if (!(spec.flags & LEFT)) { | |
1887 | while (--spec.field_width > 0) { | |
1888 | if (str < end) | |
1889 | *str = ' '; | |
1890 | ++str; | |
1891 | ||
1892 | } | |
1893 | } | |
1894 | c = (unsigned char) va_arg(args, int); | |
1895 | if (str < end) | |
1896 | *str = c; | |
1897 | ++str; | |
1898 | while (--spec.field_width > 0) { | |
1899 | if (str < end) | |
1900 | *str = ' '; | |
1901 | ++str; | |
1902 | } | |
1903 | break; | |
1904 | } | |
1905 | ||
1906 | case FORMAT_TYPE_STR: | |
1907 | str = string(str, end, va_arg(args, char *), spec); | |
1908 | break; | |
1909 | ||
1910 | case FORMAT_TYPE_PTR: | |
1911 | str = pointer(fmt, str, end, va_arg(args, void *), | |
1912 | spec); | |
1913 | while (isalnum(*fmt)) | |
1914 | fmt++; | |
1915 | break; | |
1916 | ||
1917 | case FORMAT_TYPE_PERCENT_CHAR: | |
1918 | if (str < end) | |
1919 | *str = '%'; | |
1920 | ++str; | |
1921 | break; | |
1922 | ||
1923 | case FORMAT_TYPE_INVALID: | |
1924 | /* | |
1925 | * Presumably the arguments passed gcc's type | |
1926 | * checking, but there is no safe or sane way | |
1927 | * for us to continue parsing the format and | |
1928 | * fetching from the va_list; the remaining | |
1929 | * specifiers and arguments would be out of | |
1930 | * sync. | |
1931 | */ | |
1932 | goto out; | |
1933 | ||
1934 | default: | |
1935 | switch (spec.type) { | |
1936 | case FORMAT_TYPE_LONG_LONG: | |
1937 | num = va_arg(args, long long); | |
1938 | break; | |
1939 | case FORMAT_TYPE_ULONG: | |
1940 | num = va_arg(args, unsigned long); | |
1941 | break; | |
1942 | case FORMAT_TYPE_LONG: | |
1943 | num = va_arg(args, long); | |
1944 | break; | |
1945 | case FORMAT_TYPE_SIZE_T: | |
1946 | if (spec.flags & SIGN) | |
1947 | num = va_arg(args, ssize_t); | |
1948 | else | |
1949 | num = va_arg(args, size_t); | |
1950 | break; | |
1951 | case FORMAT_TYPE_PTRDIFF: | |
1952 | num = va_arg(args, ptrdiff_t); | |
1953 | break; | |
1954 | case FORMAT_TYPE_UBYTE: | |
1955 | num = (unsigned char) va_arg(args, int); | |
1956 | break; | |
1957 | case FORMAT_TYPE_BYTE: | |
1958 | num = (signed char) va_arg(args, int); | |
1959 | break; | |
1960 | case FORMAT_TYPE_USHORT: | |
1961 | num = (unsigned short) va_arg(args, int); | |
1962 | break; | |
1963 | case FORMAT_TYPE_SHORT: | |
1964 | num = (short) va_arg(args, int); | |
1965 | break; | |
1966 | case FORMAT_TYPE_INT: | |
1967 | num = (int) va_arg(args, int); | |
1968 | break; | |
1969 | default: | |
1970 | num = va_arg(args, unsigned int); | |
1971 | } | |
1972 | ||
1973 | str = number(str, end, num, spec); | |
1974 | } | |
1975 | } | |
1976 | ||
1977 | out: | |
1978 | if (size > 0) { | |
1979 | if (str < end) | |
1980 | *str = '\0'; | |
1981 | else | |
1982 | end[-1] = '\0'; | |
1983 | } | |
1984 | ||
1985 | /* the trailing null byte doesn't count towards the total */ | |
1986 | return str-buf; | |
1987 | ||
1988 | } | |
1989 | EXPORT_SYMBOL(vsnprintf); | |
1990 | ||
1991 | /** | |
1992 | * vscnprintf - Format a string and place it in a buffer | |
1993 | * @buf: The buffer to place the result into | |
1994 | * @size: The size of the buffer, including the trailing null space | |
1995 | * @fmt: The format string to use | |
1996 | * @args: Arguments for the format string | |
1997 | * | |
1998 | * The return value is the number of characters which have been written into | |
1999 | * the @buf not including the trailing '\0'. If @size is == 0 the function | |
2000 | * returns 0. | |
2001 | * | |
2002 | * If you're not already dealing with a va_list consider using scnprintf(). | |
2003 | * | |
2004 | * See the vsnprintf() documentation for format string extensions over C99. | |
2005 | */ | |
2006 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2007 | { | |
2008 | int i; | |
2009 | ||
2010 | i = vsnprintf(buf, size, fmt, args); | |
2011 | ||
2012 | if (likely(i < size)) | |
2013 | return i; | |
2014 | if (size != 0) | |
2015 | return size - 1; | |
2016 | return 0; | |
2017 | } | |
2018 | EXPORT_SYMBOL(vscnprintf); | |
2019 | ||
2020 | /** | |
2021 | * snprintf - Format a string and place it in a buffer | |
2022 | * @buf: The buffer to place the result into | |
2023 | * @size: The size of the buffer, including the trailing null space | |
2024 | * @fmt: The format string to use | |
2025 | * @...: Arguments for the format string | |
2026 | * | |
2027 | * The return value is the number of characters which would be | |
2028 | * generated for the given input, excluding the trailing null, | |
2029 | * as per ISO C99. If the return is greater than or equal to | |
2030 | * @size, the resulting string is truncated. | |
2031 | * | |
2032 | * See the vsnprintf() documentation for format string extensions over C99. | |
2033 | */ | |
2034 | int snprintf(char *buf, size_t size, const char *fmt, ...) | |
2035 | { | |
2036 | va_list args; | |
2037 | int i; | |
2038 | ||
2039 | va_start(args, fmt); | |
2040 | i = vsnprintf(buf, size, fmt, args); | |
2041 | va_end(args); | |
2042 | ||
2043 | return i; | |
2044 | } | |
2045 | EXPORT_SYMBOL(snprintf); | |
2046 | ||
2047 | /** | |
2048 | * scnprintf - Format a string and place it in a buffer | |
2049 | * @buf: The buffer to place the result into | |
2050 | * @size: The size of the buffer, including the trailing null space | |
2051 | * @fmt: The format string to use | |
2052 | * @...: Arguments for the format string | |
2053 | * | |
2054 | * The return value is the number of characters written into @buf not including | |
2055 | * the trailing '\0'. If @size is == 0 the function returns 0. | |
2056 | */ | |
2057 | ||
2058 | int scnprintf(char *buf, size_t size, const char *fmt, ...) | |
2059 | { | |
2060 | va_list args; | |
2061 | int i; | |
2062 | ||
2063 | va_start(args, fmt); | |
2064 | i = vscnprintf(buf, size, fmt, args); | |
2065 | va_end(args); | |
2066 | ||
2067 | return i; | |
2068 | } | |
2069 | EXPORT_SYMBOL(scnprintf); | |
2070 | ||
2071 | /** | |
2072 | * vsprintf - Format a string and place it in a buffer | |
2073 | * @buf: The buffer to place the result into | |
2074 | * @fmt: The format string to use | |
2075 | * @args: Arguments for the format string | |
2076 | * | |
2077 | * The function returns the number of characters written | |
2078 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid | |
2079 | * buffer overflows. | |
2080 | * | |
2081 | * If you're not already dealing with a va_list consider using sprintf(). | |
2082 | * | |
2083 | * See the vsnprintf() documentation for format string extensions over C99. | |
2084 | */ | |
2085 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2086 | { | |
2087 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2088 | } | |
2089 | EXPORT_SYMBOL(vsprintf); | |
2090 | ||
2091 | /** | |
2092 | * sprintf - Format a string and place it in a buffer | |
2093 | * @buf: The buffer to place the result into | |
2094 | * @fmt: The format string to use | |
2095 | * @...: Arguments for the format string | |
2096 | * | |
2097 | * The function returns the number of characters written | |
2098 | * into @buf. Use snprintf() or scnprintf() in order to avoid | |
2099 | * buffer overflows. | |
2100 | * | |
2101 | * See the vsnprintf() documentation for format string extensions over C99. | |
2102 | */ | |
2103 | int sprintf(char *buf, const char *fmt, ...) | |
2104 | { | |
2105 | va_list args; | |
2106 | int i; | |
2107 | ||
2108 | va_start(args, fmt); | |
2109 | i = vsnprintf(buf, INT_MAX, fmt, args); | |
2110 | va_end(args); | |
2111 | ||
2112 | return i; | |
2113 | } | |
2114 | EXPORT_SYMBOL(sprintf); | |
2115 | ||
2116 | #ifdef CONFIG_BINARY_PRINTF | |
2117 | /* | |
2118 | * bprintf service: | |
2119 | * vbin_printf() - VA arguments to binary data | |
2120 | * bstr_printf() - Binary data to text string | |
2121 | */ | |
2122 | ||
2123 | /** | |
2124 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2125 | * @bin_buf: The buffer to place args' binary value | |
2126 | * @size: The size of the buffer(by words(32bits), not characters) | |
2127 | * @fmt: The format string to use | |
2128 | * @args: Arguments for the format string | |
2129 | * | |
2130 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
2131 | * is skipped. | |
2132 | * | |
2133 | * The return value is the number of words(32bits) which would be generated for | |
2134 | * the given input. | |
2135 | * | |
2136 | * NOTE: | |
2137 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2138 | * valid for bstr_printf(). | |
2139 | */ | |
2140 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2141 | { | |
2142 | struct printf_spec spec = {0}; | |
2143 | char *str, *end; | |
2144 | ||
2145 | str = (char *)bin_buf; | |
2146 | end = (char *)(bin_buf + size); | |
2147 | ||
2148 | #define save_arg(type) \ | |
2149 | do { \ | |
2150 | if (sizeof(type) == 8) { \ | |
2151 | unsigned long long value; \ | |
2152 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2153 | value = va_arg(args, unsigned long long); \ | |
2154 | if (str + sizeof(type) <= end) { \ | |
2155 | *(u32 *)str = *(u32 *)&value; \ | |
2156 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2157 | } \ | |
2158 | } else { \ | |
2159 | unsigned long value; \ | |
2160 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2161 | value = va_arg(args, int); \ | |
2162 | if (str + sizeof(type) <= end) \ | |
2163 | *(typeof(type) *)str = (type)value; \ | |
2164 | } \ | |
2165 | str += sizeof(type); \ | |
2166 | } while (0) | |
2167 | ||
2168 | while (*fmt) { | |
2169 | int read = format_decode(fmt, &spec); | |
2170 | ||
2171 | fmt += read; | |
2172 | ||
2173 | switch (spec.type) { | |
2174 | case FORMAT_TYPE_NONE: | |
2175 | case FORMAT_TYPE_PERCENT_CHAR: | |
2176 | break; | |
2177 | case FORMAT_TYPE_INVALID: | |
2178 | goto out; | |
2179 | ||
2180 | case FORMAT_TYPE_WIDTH: | |
2181 | case FORMAT_TYPE_PRECISION: | |
2182 | save_arg(int); | |
2183 | break; | |
2184 | ||
2185 | case FORMAT_TYPE_CHAR: | |
2186 | save_arg(char); | |
2187 | break; | |
2188 | ||
2189 | case FORMAT_TYPE_STR: { | |
2190 | const char *save_str = va_arg(args, char *); | |
2191 | size_t len; | |
2192 | ||
2193 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE | |
2194 | || (unsigned long)save_str < PAGE_SIZE) | |
2195 | save_str = "(null)"; | |
2196 | len = strlen(save_str) + 1; | |
2197 | if (str + len < end) | |
2198 | memcpy(str, save_str, len); | |
2199 | str += len; | |
2200 | break; | |
2201 | } | |
2202 | ||
2203 | case FORMAT_TYPE_PTR: | |
2204 | save_arg(void *); | |
2205 | /* skip all alphanumeric pointer suffixes */ | |
2206 | while (isalnum(*fmt)) | |
2207 | fmt++; | |
2208 | break; | |
2209 | ||
2210 | default: | |
2211 | switch (spec.type) { | |
2212 | ||
2213 | case FORMAT_TYPE_LONG_LONG: | |
2214 | save_arg(long long); | |
2215 | break; | |
2216 | case FORMAT_TYPE_ULONG: | |
2217 | case FORMAT_TYPE_LONG: | |
2218 | save_arg(unsigned long); | |
2219 | break; | |
2220 | case FORMAT_TYPE_SIZE_T: | |
2221 | save_arg(size_t); | |
2222 | break; | |
2223 | case FORMAT_TYPE_PTRDIFF: | |
2224 | save_arg(ptrdiff_t); | |
2225 | break; | |
2226 | case FORMAT_TYPE_UBYTE: | |
2227 | case FORMAT_TYPE_BYTE: | |
2228 | save_arg(char); | |
2229 | break; | |
2230 | case FORMAT_TYPE_USHORT: | |
2231 | case FORMAT_TYPE_SHORT: | |
2232 | save_arg(short); | |
2233 | break; | |
2234 | default: | |
2235 | save_arg(int); | |
2236 | } | |
2237 | } | |
2238 | } | |
2239 | ||
2240 | out: | |
2241 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; | |
2242 | #undef save_arg | |
2243 | } | |
2244 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2245 | ||
2246 | /** | |
2247 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2248 | * @buf: The buffer to place the result into | |
2249 | * @size: The size of the buffer, including the trailing null space | |
2250 | * @fmt: The format string to use | |
2251 | * @bin_buf: Binary arguments for the format string | |
2252 | * | |
2253 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2254 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2255 | * a binary buffer that generated by vbin_printf. | |
2256 | * | |
2257 | * The format follows C99 vsnprintf, but has some extensions: | |
2258 | * see vsnprintf comment for details. | |
2259 | * | |
2260 | * The return value is the number of characters which would | |
2261 | * be generated for the given input, excluding the trailing | |
2262 | * '\0', as per ISO C99. If you want to have the exact | |
2263 | * number of characters written into @buf as return value | |
2264 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2265 | * return is greater than or equal to @size, the resulting | |
2266 | * string is truncated. | |
2267 | */ | |
2268 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2269 | { | |
2270 | struct printf_spec spec = {0}; | |
2271 | char *str, *end; | |
2272 | const char *args = (const char *)bin_buf; | |
2273 | ||
2274 | if (WARN_ON_ONCE(size > INT_MAX)) | |
2275 | return 0; | |
2276 | ||
2277 | str = buf; | |
2278 | end = buf + size; | |
2279 | ||
2280 | #define get_arg(type) \ | |
2281 | ({ \ | |
2282 | typeof(type) value; \ | |
2283 | if (sizeof(type) == 8) { \ | |
2284 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2285 | *(u32 *)&value = *(u32 *)args; \ | |
2286 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2287 | } else { \ | |
2288 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2289 | value = *(typeof(type) *)args; \ | |
2290 | } \ | |
2291 | args += sizeof(type); \ | |
2292 | value; \ | |
2293 | }) | |
2294 | ||
2295 | /* Make sure end is always >= buf */ | |
2296 | if (end < buf) { | |
2297 | end = ((void *)-1); | |
2298 | size = end - buf; | |
2299 | } | |
2300 | ||
2301 | while (*fmt) { | |
2302 | const char *old_fmt = fmt; | |
2303 | int read = format_decode(fmt, &spec); | |
2304 | ||
2305 | fmt += read; | |
2306 | ||
2307 | switch (spec.type) { | |
2308 | case FORMAT_TYPE_NONE: { | |
2309 | int copy = read; | |
2310 | if (str < end) { | |
2311 | if (copy > end - str) | |
2312 | copy = end - str; | |
2313 | memcpy(str, old_fmt, copy); | |
2314 | } | |
2315 | str += read; | |
2316 | break; | |
2317 | } | |
2318 | ||
2319 | case FORMAT_TYPE_WIDTH: | |
2320 | spec.field_width = get_arg(int); | |
2321 | break; | |
2322 | ||
2323 | case FORMAT_TYPE_PRECISION: | |
2324 | spec.precision = get_arg(int); | |
2325 | break; | |
2326 | ||
2327 | case FORMAT_TYPE_CHAR: { | |
2328 | char c; | |
2329 | ||
2330 | if (!(spec.flags & LEFT)) { | |
2331 | while (--spec.field_width > 0) { | |
2332 | if (str < end) | |
2333 | *str = ' '; | |
2334 | ++str; | |
2335 | } | |
2336 | } | |
2337 | c = (unsigned char) get_arg(char); | |
2338 | if (str < end) | |
2339 | *str = c; | |
2340 | ++str; | |
2341 | while (--spec.field_width > 0) { | |
2342 | if (str < end) | |
2343 | *str = ' '; | |
2344 | ++str; | |
2345 | } | |
2346 | break; | |
2347 | } | |
2348 | ||
2349 | case FORMAT_TYPE_STR: { | |
2350 | const char *str_arg = args; | |
2351 | args += strlen(str_arg) + 1; | |
2352 | str = string(str, end, (char *)str_arg, spec); | |
2353 | break; | |
2354 | } | |
2355 | ||
2356 | case FORMAT_TYPE_PTR: | |
2357 | str = pointer(fmt, str, end, get_arg(void *), spec); | |
2358 | while (isalnum(*fmt)) | |
2359 | fmt++; | |
2360 | break; | |
2361 | ||
2362 | case FORMAT_TYPE_PERCENT_CHAR: | |
2363 | if (str < end) | |
2364 | *str = '%'; | |
2365 | ++str; | |
2366 | break; | |
2367 | ||
2368 | case FORMAT_TYPE_INVALID: | |
2369 | goto out; | |
2370 | ||
2371 | default: { | |
2372 | unsigned long long num; | |
2373 | ||
2374 | switch (spec.type) { | |
2375 | ||
2376 | case FORMAT_TYPE_LONG_LONG: | |
2377 | num = get_arg(long long); | |
2378 | break; | |
2379 | case FORMAT_TYPE_ULONG: | |
2380 | case FORMAT_TYPE_LONG: | |
2381 | num = get_arg(unsigned long); | |
2382 | break; | |
2383 | case FORMAT_TYPE_SIZE_T: | |
2384 | num = get_arg(size_t); | |
2385 | break; | |
2386 | case FORMAT_TYPE_PTRDIFF: | |
2387 | num = get_arg(ptrdiff_t); | |
2388 | break; | |
2389 | case FORMAT_TYPE_UBYTE: | |
2390 | num = get_arg(unsigned char); | |
2391 | break; | |
2392 | case FORMAT_TYPE_BYTE: | |
2393 | num = get_arg(signed char); | |
2394 | break; | |
2395 | case FORMAT_TYPE_USHORT: | |
2396 | num = get_arg(unsigned short); | |
2397 | break; | |
2398 | case FORMAT_TYPE_SHORT: | |
2399 | num = get_arg(short); | |
2400 | break; | |
2401 | case FORMAT_TYPE_UINT: | |
2402 | num = get_arg(unsigned int); | |
2403 | break; | |
2404 | default: | |
2405 | num = get_arg(int); | |
2406 | } | |
2407 | ||
2408 | str = number(str, end, num, spec); | |
2409 | } /* default: */ | |
2410 | } /* switch(spec.type) */ | |
2411 | } /* while(*fmt) */ | |
2412 | ||
2413 | out: | |
2414 | if (size > 0) { | |
2415 | if (str < end) | |
2416 | *str = '\0'; | |
2417 | else | |
2418 | end[-1] = '\0'; | |
2419 | } | |
2420 | ||
2421 | #undef get_arg | |
2422 | ||
2423 | /* the trailing null byte doesn't count towards the total */ | |
2424 | return str - buf; | |
2425 | } | |
2426 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2427 | ||
2428 | /** | |
2429 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2430 | * @bin_buf: The buffer to place args' binary value | |
2431 | * @size: The size of the buffer(by words(32bits), not characters) | |
2432 | * @fmt: The format string to use | |
2433 | * @...: Arguments for the format string | |
2434 | * | |
2435 | * The function returns the number of words(u32) written | |
2436 | * into @bin_buf. | |
2437 | */ | |
2438 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2439 | { | |
2440 | va_list args; | |
2441 | int ret; | |
2442 | ||
2443 | va_start(args, fmt); | |
2444 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2445 | va_end(args); | |
2446 | ||
2447 | return ret; | |
2448 | } | |
2449 | EXPORT_SYMBOL_GPL(bprintf); | |
2450 | ||
2451 | #endif /* CONFIG_BINARY_PRINTF */ | |
2452 | ||
2453 | /** | |
2454 | * vsscanf - Unformat a buffer into a list of arguments | |
2455 | * @buf: input buffer | |
2456 | * @fmt: format of buffer | |
2457 | * @args: arguments | |
2458 | */ | |
2459 | int vsscanf(const char *buf, const char *fmt, va_list args) | |
2460 | { | |
2461 | const char *str = buf; | |
2462 | char *next; | |
2463 | char digit; | |
2464 | int num = 0; | |
2465 | u8 qualifier; | |
2466 | unsigned int base; | |
2467 | union { | |
2468 | long long s; | |
2469 | unsigned long long u; | |
2470 | } val; | |
2471 | s16 field_width; | |
2472 | bool is_sign; | |
2473 | ||
2474 | while (*fmt) { | |
2475 | /* skip any white space in format */ | |
2476 | /* white space in format matchs any amount of | |
2477 | * white space, including none, in the input. | |
2478 | */ | |
2479 | if (isspace(*fmt)) { | |
2480 | fmt = skip_spaces(++fmt); | |
2481 | str = skip_spaces(str); | |
2482 | } | |
2483 | ||
2484 | /* anything that is not a conversion must match exactly */ | |
2485 | if (*fmt != '%' && *fmt) { | |
2486 | if (*fmt++ != *str++) | |
2487 | break; | |
2488 | continue; | |
2489 | } | |
2490 | ||
2491 | if (!*fmt) | |
2492 | break; | |
2493 | ++fmt; | |
2494 | ||
2495 | /* skip this conversion. | |
2496 | * advance both strings to next white space | |
2497 | */ | |
2498 | if (*fmt == '*') { | |
2499 | if (!*str) | |
2500 | break; | |
2501 | while (!isspace(*fmt) && *fmt != '%' && *fmt) | |
2502 | fmt++; | |
2503 | while (!isspace(*str) && *str) | |
2504 | str++; | |
2505 | continue; | |
2506 | } | |
2507 | ||
2508 | /* get field width */ | |
2509 | field_width = -1; | |
2510 | if (isdigit(*fmt)) { | |
2511 | field_width = skip_atoi(&fmt); | |
2512 | if (field_width <= 0) | |
2513 | break; | |
2514 | } | |
2515 | ||
2516 | /* get conversion qualifier */ | |
2517 | qualifier = -1; | |
2518 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || | |
2519 | _tolower(*fmt) == 'z') { | |
2520 | qualifier = *fmt++; | |
2521 | if (unlikely(qualifier == *fmt)) { | |
2522 | if (qualifier == 'h') { | |
2523 | qualifier = 'H'; | |
2524 | fmt++; | |
2525 | } else if (qualifier == 'l') { | |
2526 | qualifier = 'L'; | |
2527 | fmt++; | |
2528 | } | |
2529 | } | |
2530 | } | |
2531 | ||
2532 | if (!*fmt) | |
2533 | break; | |
2534 | ||
2535 | if (*fmt == 'n') { | |
2536 | /* return number of characters read so far */ | |
2537 | *va_arg(args, int *) = str - buf; | |
2538 | ++fmt; | |
2539 | continue; | |
2540 | } | |
2541 | ||
2542 | if (!*str) | |
2543 | break; | |
2544 | ||
2545 | base = 10; | |
2546 | is_sign = false; | |
2547 | ||
2548 | switch (*fmt++) { | |
2549 | case 'c': | |
2550 | { | |
2551 | char *s = (char *)va_arg(args, char*); | |
2552 | if (field_width == -1) | |
2553 | field_width = 1; | |
2554 | do { | |
2555 | *s++ = *str++; | |
2556 | } while (--field_width > 0 && *str); | |
2557 | num++; | |
2558 | } | |
2559 | continue; | |
2560 | case 's': | |
2561 | { | |
2562 | char *s = (char *)va_arg(args, char *); | |
2563 | if (field_width == -1) | |
2564 | field_width = SHRT_MAX; | |
2565 | /* first, skip leading white space in buffer */ | |
2566 | str = skip_spaces(str); | |
2567 | ||
2568 | /* now copy until next white space */ | |
2569 | while (*str && !isspace(*str) && field_width--) | |
2570 | *s++ = *str++; | |
2571 | *s = '\0'; | |
2572 | num++; | |
2573 | } | |
2574 | continue; | |
2575 | case 'o': | |
2576 | base = 8; | |
2577 | break; | |
2578 | case 'x': | |
2579 | case 'X': | |
2580 | base = 16; | |
2581 | break; | |
2582 | case 'i': | |
2583 | base = 0; | |
2584 | case 'd': | |
2585 | is_sign = true; | |
2586 | case 'u': | |
2587 | break; | |
2588 | case '%': | |
2589 | /* looking for '%' in str */ | |
2590 | if (*str++ != '%') | |
2591 | return num; | |
2592 | continue; | |
2593 | default: | |
2594 | /* invalid format; stop here */ | |
2595 | return num; | |
2596 | } | |
2597 | ||
2598 | /* have some sort of integer conversion. | |
2599 | * first, skip white space in buffer. | |
2600 | */ | |
2601 | str = skip_spaces(str); | |
2602 | ||
2603 | digit = *str; | |
2604 | if (is_sign && digit == '-') | |
2605 | digit = *(str + 1); | |
2606 | ||
2607 | if (!digit | |
2608 | || (base == 16 && !isxdigit(digit)) | |
2609 | || (base == 10 && !isdigit(digit)) | |
2610 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2611 | || (base == 0 && !isdigit(digit))) | |
2612 | break; | |
2613 | ||
2614 | if (is_sign) | |
2615 | val.s = qualifier != 'L' ? | |
2616 | simple_strtol(str, &next, base) : | |
2617 | simple_strtoll(str, &next, base); | |
2618 | else | |
2619 | val.u = qualifier != 'L' ? | |
2620 | simple_strtoul(str, &next, base) : | |
2621 | simple_strtoull(str, &next, base); | |
2622 | ||
2623 | if (field_width > 0 && next - str > field_width) { | |
2624 | if (base == 0) | |
2625 | _parse_integer_fixup_radix(str, &base); | |
2626 | while (next - str > field_width) { | |
2627 | if (is_sign) | |
2628 | val.s = div_s64(val.s, base); | |
2629 | else | |
2630 | val.u = div_u64(val.u, base); | |
2631 | --next; | |
2632 | } | |
2633 | } | |
2634 | ||
2635 | switch (qualifier) { | |
2636 | case 'H': /* that's 'hh' in format */ | |
2637 | if (is_sign) | |
2638 | *va_arg(args, signed char *) = val.s; | |
2639 | else | |
2640 | *va_arg(args, unsigned char *) = val.u; | |
2641 | break; | |
2642 | case 'h': | |
2643 | if (is_sign) | |
2644 | *va_arg(args, short *) = val.s; | |
2645 | else | |
2646 | *va_arg(args, unsigned short *) = val.u; | |
2647 | break; | |
2648 | case 'l': | |
2649 | if (is_sign) | |
2650 | *va_arg(args, long *) = val.s; | |
2651 | else | |
2652 | *va_arg(args, unsigned long *) = val.u; | |
2653 | break; | |
2654 | case 'L': | |
2655 | if (is_sign) | |
2656 | *va_arg(args, long long *) = val.s; | |
2657 | else | |
2658 | *va_arg(args, unsigned long long *) = val.u; | |
2659 | break; | |
2660 | case 'Z': | |
2661 | case 'z': | |
2662 | *va_arg(args, size_t *) = val.u; | |
2663 | break; | |
2664 | default: | |
2665 | if (is_sign) | |
2666 | *va_arg(args, int *) = val.s; | |
2667 | else | |
2668 | *va_arg(args, unsigned int *) = val.u; | |
2669 | break; | |
2670 | } | |
2671 | num++; | |
2672 | ||
2673 | if (!next) | |
2674 | break; | |
2675 | str = next; | |
2676 | } | |
2677 | ||
2678 | return num; | |
2679 | } | |
2680 | EXPORT_SYMBOL(vsscanf); | |
2681 | ||
2682 | /** | |
2683 | * sscanf - Unformat a buffer into a list of arguments | |
2684 | * @buf: input buffer | |
2685 | * @fmt: formatting of buffer | |
2686 | * @...: resulting arguments | |
2687 | */ | |
2688 | int sscanf(const char *buf, const char *fmt, ...) | |
2689 | { | |
2690 | va_list args; | |
2691 | int i; | |
2692 | ||
2693 | va_start(args, fmt); | |
2694 | i = vsscanf(buf, fmt, args); | |
2695 | va_end(args); | |
2696 | ||
2697 | return i; | |
2698 | } | |
2699 | EXPORT_SYMBOL(sscanf); |