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Commit | Line | Data |
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1da177e4 LT |
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 | ||
7b9186f5 | 12 | /* |
1da177e4 LT |
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> | |
8bc3bcc9 | 20 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/kernel.h> | |
0fe1ef24 LT |
25 | #include <linux/kallsyms.h> |
26 | #include <linux/uaccess.h> | |
332d2e78 | 27 | #include <linux/ioport.h> |
8a27f7c9 | 28 | #include <net/addrconf.h> |
1da177e4 | 29 | |
4e57b681 | 30 | #include <asm/page.h> /* for PAGE_SIZE */ |
1da177e4 | 31 | #include <asm/div64.h> |
deac93df | 32 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
1da177e4 | 33 | |
1dff46d6 | 34 | #include "kstrtox.h" |
aa46a63e | 35 | |
1da177e4 | 36 | /** |
922ac25c | 37 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
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 | */ | |
922ac25c | 42 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 43 | { |
1dff46d6 AD |
44 | unsigned long long result; |
45 | unsigned int rv; | |
aa46a63e | 46 | |
1dff46d6 AD |
47 | cp = _parse_integer_fixup_radix(cp, &base); |
48 | rv = _parse_integer(cp, base, &result); | |
49 | /* FIXME */ | |
50 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 51 | |
1da177e4 LT |
52 | if (endp) |
53 | *endp = (char *)cp; | |
7b9186f5 | 54 | |
1da177e4 LT |
55 | return result; |
56 | } | |
922ac25c | 57 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
58 | |
59 | /** | |
922ac25c | 60 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
61 | * @cp: The start of the string |
62 | * @endp: A pointer to the end of the parsed string will be placed here | |
63 | * @base: The number base to use | |
64 | */ | |
922ac25c | 65 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 66 | { |
922ac25c | 67 | return simple_strtoull(cp, endp, base); |
1da177e4 | 68 | } |
922ac25c | 69 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
70 | |
71 | /** | |
922ac25c | 72 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
73 | * @cp: The start of the string |
74 | * @endp: A pointer to the end of the parsed string will be placed here | |
75 | * @base: The number base to use | |
76 | */ | |
922ac25c | 77 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 78 | { |
922ac25c AGR |
79 | if (*cp == '-') |
80 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 81 | |
922ac25c | 82 | return simple_strtoul(cp, endp, base); |
1da177e4 | 83 | } |
922ac25c | 84 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
85 | |
86 | /** | |
87 | * simple_strtoll - convert a string to a signed long long | |
88 | * @cp: The start of the string | |
89 | * @endp: A pointer to the end of the parsed string will be placed here | |
90 | * @base: The number base to use | |
91 | */ | |
22d27051 | 92 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 93 | { |
7b9186f5 | 94 | if (*cp == '-') |
22d27051 | 95 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 96 | |
22d27051 | 97 | return simple_strtoull(cp, endp, base); |
1da177e4 | 98 | } |
98d5ce0d | 99 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 100 | |
cf3b429b JP |
101 | static noinline_for_stack |
102 | int skip_atoi(const char **s) | |
1da177e4 | 103 | { |
7b9186f5 | 104 | int i = 0; |
1da177e4 LT |
105 | |
106 | while (isdigit(**s)) | |
107 | i = i*10 + *((*s)++) - '0'; | |
7b9186f5 | 108 | |
1da177e4 LT |
109 | return i; |
110 | } | |
111 | ||
4277eedd DV |
112 | /* Decimal conversion is by far the most typical, and is used |
113 | * for /proc and /sys data. This directly impacts e.g. top performance | |
114 | * with many processes running. We optimize it for speed | |
115 | * using code from | |
116 | * http://www.cs.uiowa.edu/~jones/bcd/decimal.html | |
117 | * (with permission from the author, Douglas W. Jones). */ | |
118 | ||
119 | /* Formats correctly any integer in [0,99999]. | |
120 | * Outputs from one to five digits depending on input. | |
121 | * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */ | |
cf3b429b JP |
122 | static noinline_for_stack |
123 | char *put_dec_trunc(char *buf, unsigned q) | |
4277eedd DV |
124 | { |
125 | unsigned d3, d2, d1, d0; | |
126 | d1 = (q>>4) & 0xf; | |
127 | d2 = (q>>8) & 0xf; | |
128 | d3 = (q>>12); | |
129 | ||
130 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); | |
131 | q = (d0 * 0xcd) >> 11; | |
132 | d0 = d0 - 10*q; | |
133 | *buf++ = d0 + '0'; /* least significant digit */ | |
134 | d1 = q + 9*d3 + 5*d2 + d1; | |
135 | if (d1 != 0) { | |
136 | q = (d1 * 0xcd) >> 11; | |
137 | d1 = d1 - 10*q; | |
138 | *buf++ = d1 + '0'; /* next digit */ | |
139 | ||
140 | d2 = q + 2*d2; | |
141 | if ((d2 != 0) || (d3 != 0)) { | |
142 | q = (d2 * 0xd) >> 7; | |
143 | d2 = d2 - 10*q; | |
144 | *buf++ = d2 + '0'; /* next digit */ | |
145 | ||
146 | d3 = q + 4*d3; | |
147 | if (d3 != 0) { | |
148 | q = (d3 * 0xcd) >> 11; | |
149 | d3 = d3 - 10*q; | |
150 | *buf++ = d3 + '0'; /* next digit */ | |
151 | if (q != 0) | |
7b9186f5 | 152 | *buf++ = q + '0'; /* most sign. digit */ |
4277eedd DV |
153 | } |
154 | } | |
155 | } | |
7b9186f5 | 156 | |
4277eedd DV |
157 | return buf; |
158 | } | |
159 | /* Same with if's removed. Always emits five digits */ | |
cf3b429b JP |
160 | static noinline_for_stack |
161 | char *put_dec_full(char *buf, unsigned q) | |
4277eedd DV |
162 | { |
163 | /* BTW, if q is in [0,9999], 8-bit ints will be enough, */ | |
164 | /* but anyway, gcc produces better code with full-sized ints */ | |
165 | unsigned d3, d2, d1, d0; | |
166 | d1 = (q>>4) & 0xf; | |
167 | d2 = (q>>8) & 0xf; | |
168 | d3 = (q>>12); | |
169 | ||
7b9186f5 AGR |
170 | /* |
171 | * Possible ways to approx. divide by 10 | |
172 | * gcc -O2 replaces multiply with shifts and adds | |
173 | * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386) | |
174 | * (x * 0x67) >> 10: 1100111 | |
175 | * (x * 0x34) >> 9: 110100 - same | |
176 | * (x * 0x1a) >> 8: 11010 - same | |
177 | * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386) | |
178 | */ | |
4277eedd DV |
179 | d0 = 6*(d3 + d2 + d1) + (q & 0xf); |
180 | q = (d0 * 0xcd) >> 11; | |
181 | d0 = d0 - 10*q; | |
182 | *buf++ = d0 + '0'; | |
183 | d1 = q + 9*d3 + 5*d2 + d1; | |
184 | q = (d1 * 0xcd) >> 11; | |
185 | d1 = d1 - 10*q; | |
186 | *buf++ = d1 + '0'; | |
187 | ||
188 | d2 = q + 2*d2; | |
189 | q = (d2 * 0xd) >> 7; | |
190 | d2 = d2 - 10*q; | |
191 | *buf++ = d2 + '0'; | |
192 | ||
193 | d3 = q + 4*d3; | |
194 | q = (d3 * 0xcd) >> 11; /* - shorter code */ | |
195 | /* q = (d3 * 0x67) >> 10; - would also work */ | |
196 | d3 = d3 - 10*q; | |
197 | *buf++ = d3 + '0'; | |
198 | *buf++ = q + '0'; | |
7b9186f5 | 199 | |
4277eedd DV |
200 | return buf; |
201 | } | |
202 | /* No inlining helps gcc to use registers better */ | |
cf3b429b JP |
203 | static noinline_for_stack |
204 | char *put_dec(char *buf, unsigned long long num) | |
4277eedd DV |
205 | { |
206 | while (1) { | |
207 | unsigned rem; | |
208 | if (num < 100000) | |
209 | return put_dec_trunc(buf, num); | |
210 | rem = do_div(num, 100000); | |
211 | buf = put_dec_full(buf, rem); | |
212 | } | |
213 | } | |
214 | ||
1ac101a5 KH |
215 | /* |
216 | * Convert passed number to decimal string. | |
217 | * Returns the length of string. On buffer overflow, returns 0. | |
218 | * | |
219 | * If speed is not important, use snprintf(). It's easy to read the code. | |
220 | */ | |
221 | int num_to_str(char *buf, int size, unsigned long long num) | |
222 | { | |
223 | char tmp[21]; /* Enough for 2^64 in decimal */ | |
224 | int idx, len; | |
225 | ||
226 | len = put_dec(tmp, num) - tmp; | |
227 | ||
228 | if (len > size) | |
229 | return 0; | |
230 | for (idx = 0; idx < len; ++idx) | |
231 | buf[idx] = tmp[len - idx - 1]; | |
232 | return len; | |
233 | } | |
234 | ||
1da177e4 LT |
235 | #define ZEROPAD 1 /* pad with zero */ |
236 | #define SIGN 2 /* unsigned/signed long */ | |
237 | #define PLUS 4 /* show plus */ | |
238 | #define SPACE 8 /* space if plus */ | |
239 | #define LEFT 16 /* left justified */ | |
b89dc5d6 BH |
240 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
241 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 242 | |
fef20d9c FW |
243 | enum format_type { |
244 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 245 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
246 | FORMAT_TYPE_PRECISION, |
247 | FORMAT_TYPE_CHAR, | |
248 | FORMAT_TYPE_STR, | |
249 | FORMAT_TYPE_PTR, | |
250 | FORMAT_TYPE_PERCENT_CHAR, | |
251 | FORMAT_TYPE_INVALID, | |
252 | FORMAT_TYPE_LONG_LONG, | |
253 | FORMAT_TYPE_ULONG, | |
254 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
255 | FORMAT_TYPE_UBYTE, |
256 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
257 | FORMAT_TYPE_USHORT, |
258 | FORMAT_TYPE_SHORT, | |
259 | FORMAT_TYPE_UINT, | |
260 | FORMAT_TYPE_INT, | |
261 | FORMAT_TYPE_NRCHARS, | |
262 | FORMAT_TYPE_SIZE_T, | |
263 | FORMAT_TYPE_PTRDIFF | |
264 | }; | |
265 | ||
266 | struct printf_spec { | |
4e310fda | 267 | u8 type; /* format_type enum */ |
ef0658f3 | 268 | u8 flags; /* flags to number() */ |
4e310fda JP |
269 | u8 base; /* number base, 8, 10 or 16 only */ |
270 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
271 | s16 field_width; /* width of output field */ | |
272 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
273 | }; |
274 | ||
cf3b429b JP |
275 | static noinline_for_stack |
276 | char *number(char *buf, char *end, unsigned long long num, | |
277 | struct printf_spec spec) | |
1da177e4 | 278 | { |
9b706aee DV |
279 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
280 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
281 | ||
282 | char tmp[66]; | |
283 | char sign; | |
284 | char locase; | |
fef20d9c | 285 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 286 | int i; |
7c203422 | 287 | bool is_zero = num == 0LL; |
1da177e4 | 288 | |
9b706aee DV |
289 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
290 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
291 | locase = (spec.flags & SMALL); |
292 | if (spec.flags & LEFT) | |
293 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 294 | sign = 0; |
fef20d9c | 295 | if (spec.flags & SIGN) { |
7b9186f5 | 296 | if ((signed long long)num < 0) { |
1da177e4 | 297 | sign = '-'; |
7b9186f5 | 298 | num = -(signed long long)num; |
fef20d9c FW |
299 | spec.field_width--; |
300 | } else if (spec.flags & PLUS) { | |
1da177e4 | 301 | sign = '+'; |
fef20d9c FW |
302 | spec.field_width--; |
303 | } else if (spec.flags & SPACE) { | |
1da177e4 | 304 | sign = ' '; |
fef20d9c | 305 | spec.field_width--; |
1da177e4 LT |
306 | } |
307 | } | |
b39a7340 | 308 | if (need_pfx) { |
fef20d9c | 309 | if (spec.base == 16) |
7c203422 PC |
310 | spec.field_width -= 2; |
311 | else if (!is_zero) | |
fef20d9c | 312 | spec.field_width--; |
1da177e4 | 313 | } |
b39a7340 DV |
314 | |
315 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 LT |
316 | i = 0; |
317 | if (num == 0) | |
b39a7340 | 318 | tmp[i++] = '0'; |
4277eedd DV |
319 | /* Generic code, for any base: |
320 | else do { | |
9b706aee | 321 | tmp[i++] = (digits[do_div(num,base)] | locase); |
4277eedd DV |
322 | } while (num != 0); |
323 | */ | |
fef20d9c FW |
324 | else if (spec.base != 10) { /* 8 or 16 */ |
325 | int mask = spec.base - 1; | |
b39a7340 | 326 | int shift = 3; |
7b9186f5 AGR |
327 | |
328 | if (spec.base == 16) | |
329 | shift = 4; | |
b39a7340 | 330 | do { |
9b706aee | 331 | tmp[i++] = (digits[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
332 | num >>= shift; |
333 | } while (num); | |
4277eedd DV |
334 | } else { /* base 10 */ |
335 | i = put_dec(tmp, num) - tmp; | |
336 | } | |
b39a7340 DV |
337 | |
338 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
339 | if (i > spec.precision) |
340 | spec.precision = i; | |
b39a7340 | 341 | /* leading space padding */ |
fef20d9c FW |
342 | spec.field_width -= spec.precision; |
343 | if (!(spec.flags & (ZEROPAD+LEFT))) { | |
7b9186f5 | 344 | while (--spec.field_width >= 0) { |
f796937a | 345 | if (buf < end) |
1da177e4 LT |
346 | *buf = ' '; |
347 | ++buf; | |
348 | } | |
349 | } | |
b39a7340 | 350 | /* sign */ |
1da177e4 | 351 | if (sign) { |
f796937a | 352 | if (buf < end) |
1da177e4 LT |
353 | *buf = sign; |
354 | ++buf; | |
355 | } | |
b39a7340 DV |
356 | /* "0x" / "0" prefix */ |
357 | if (need_pfx) { | |
7c203422 PC |
358 | if (spec.base == 16 || !is_zero) { |
359 | if (buf < end) | |
360 | *buf = '0'; | |
361 | ++buf; | |
362 | } | |
fef20d9c | 363 | if (spec.base == 16) { |
f796937a | 364 | if (buf < end) |
9b706aee | 365 | *buf = ('X' | locase); |
1da177e4 LT |
366 | ++buf; |
367 | } | |
368 | } | |
b39a7340 | 369 | /* zero or space padding */ |
fef20d9c FW |
370 | if (!(spec.flags & LEFT)) { |
371 | char c = (spec.flags & ZEROPAD) ? '0' : ' '; | |
372 | while (--spec.field_width >= 0) { | |
f796937a | 373 | if (buf < end) |
1da177e4 LT |
374 | *buf = c; |
375 | ++buf; | |
376 | } | |
377 | } | |
b39a7340 | 378 | /* hmm even more zero padding? */ |
fef20d9c | 379 | while (i <= --spec.precision) { |
f796937a | 380 | if (buf < end) |
1da177e4 LT |
381 | *buf = '0'; |
382 | ++buf; | |
383 | } | |
b39a7340 DV |
384 | /* actual digits of result */ |
385 | while (--i >= 0) { | |
f796937a | 386 | if (buf < end) |
1da177e4 LT |
387 | *buf = tmp[i]; |
388 | ++buf; | |
389 | } | |
b39a7340 | 390 | /* trailing space padding */ |
fef20d9c | 391 | while (--spec.field_width >= 0) { |
f796937a | 392 | if (buf < end) |
1da177e4 LT |
393 | *buf = ' '; |
394 | ++buf; | |
395 | } | |
7b9186f5 | 396 | |
1da177e4 LT |
397 | return buf; |
398 | } | |
399 | ||
cf3b429b JP |
400 | static noinline_for_stack |
401 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
402 | { |
403 | int len, i; | |
404 | ||
405 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 406 | s = "(null)"; |
0f9bfa56 | 407 | |
fef20d9c | 408 | len = strnlen(s, spec.precision); |
0f9bfa56 | 409 | |
fef20d9c FW |
410 | if (!(spec.flags & LEFT)) { |
411 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
412 | if (buf < end) |
413 | *buf = ' '; | |
414 | ++buf; | |
415 | } | |
416 | } | |
417 | for (i = 0; i < len; ++i) { | |
418 | if (buf < end) | |
419 | *buf = *s; | |
420 | ++buf; ++s; | |
421 | } | |
fef20d9c | 422 | while (len < spec.field_width--) { |
0f9bfa56 LT |
423 | if (buf < end) |
424 | *buf = ' '; | |
425 | ++buf; | |
426 | } | |
7b9186f5 | 427 | |
0f9bfa56 LT |
428 | return buf; |
429 | } | |
430 | ||
cf3b429b JP |
431 | static noinline_for_stack |
432 | char *symbol_string(char *buf, char *end, void *ptr, | |
433 | struct printf_spec spec, char ext) | |
0fe1ef24 LT |
434 | { |
435 | unsigned long value = (unsigned long) ptr; | |
436 | #ifdef CONFIG_KALLSYMS | |
437 | char sym[KSYM_SYMBOL_LEN]; | |
0f77a8d3 NK |
438 | if (ext == 'B') |
439 | sprint_backtrace(sym, value); | |
440 | else if (ext != 'f' && ext != 's') | |
0c8b946e FW |
441 | sprint_symbol(sym, value); |
442 | else | |
4796dd20 | 443 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 444 | |
fef20d9c | 445 | return string(buf, end, sym, spec); |
0fe1ef24 | 446 | #else |
7b9186f5 | 447 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
448 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
449 | spec.base = 16; | |
7b9186f5 | 450 | |
fef20d9c | 451 | return number(buf, end, value, spec); |
0fe1ef24 LT |
452 | #endif |
453 | } | |
454 | ||
cf3b429b JP |
455 | static noinline_for_stack |
456 | char *resource_string(char *buf, char *end, struct resource *res, | |
457 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
458 | { |
459 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 460 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
461 | #endif |
462 | ||
463 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 464 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 465 | #endif |
4da0b66c | 466 | static const struct printf_spec io_spec = { |
fef20d9c | 467 | .base = 16, |
4da0b66c | 468 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
469 | .precision = -1, |
470 | .flags = SPECIAL | SMALL | ZEROPAD, | |
471 | }; | |
4da0b66c BH |
472 | static const struct printf_spec mem_spec = { |
473 | .base = 16, | |
474 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
475 | .precision = -1, | |
476 | .flags = SPECIAL | SMALL | ZEROPAD, | |
477 | }; | |
0f4050c7 BH |
478 | static const struct printf_spec bus_spec = { |
479 | .base = 16, | |
480 | .field_width = 2, | |
481 | .precision = -1, | |
482 | .flags = SMALL | ZEROPAD, | |
483 | }; | |
4da0b66c | 484 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
485 | .base = 10, |
486 | .precision = -1, | |
487 | .flags = 0, | |
488 | }; | |
4da0b66c | 489 | static const struct printf_spec str_spec = { |
fd95541e BH |
490 | .field_width = -1, |
491 | .precision = 10, | |
492 | .flags = LEFT, | |
493 | }; | |
4da0b66c | 494 | static const struct printf_spec flag_spec = { |
fd95541e BH |
495 | .base = 16, |
496 | .precision = -1, | |
497 | .flags = SPECIAL | SMALL, | |
498 | }; | |
c7dabef8 BH |
499 | |
500 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
501 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
502 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
503 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 504 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
505 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
506 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
507 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
508 | ||
332d2e78 | 509 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 510 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 511 | const struct printf_spec *specp; |
332d2e78 LT |
512 | |
513 | *p++ = '['; | |
4da0b66c | 514 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 515 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
516 | specp = &io_spec; |
517 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 518 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
519 | specp = &mem_spec; |
520 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 521 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
522 | specp = &dec_spec; |
523 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 524 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 525 | specp = &dec_spec; |
0f4050c7 BH |
526 | } else if (res->flags & IORESOURCE_BUS) { |
527 | p = string(p, pend, "bus ", str_spec); | |
528 | specp = &bus_spec; | |
4da0b66c | 529 | } else { |
c7dabef8 | 530 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 531 | specp = &mem_spec; |
c7dabef8 | 532 | decode = 0; |
fd95541e | 533 | } |
4da0b66c | 534 | p = number(p, pend, res->start, *specp); |
c91d3376 BH |
535 | if (res->start != res->end) { |
536 | *p++ = '-'; | |
4da0b66c | 537 | p = number(p, pend, res->end, *specp); |
c91d3376 | 538 | } |
c7dabef8 | 539 | if (decode) { |
fd95541e BH |
540 | if (res->flags & IORESOURCE_MEM_64) |
541 | p = string(p, pend, " 64bit", str_spec); | |
542 | if (res->flags & IORESOURCE_PREFETCH) | |
543 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
544 | if (res->flags & IORESOURCE_WINDOW) |
545 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
546 | if (res->flags & IORESOURCE_DISABLED) |
547 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
548 | } else { |
549 | p = string(p, pend, " flags ", str_spec); | |
550 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 551 | } |
332d2e78 | 552 | *p++ = ']'; |
c7dabef8 | 553 | *p = '\0'; |
332d2e78 | 554 | |
fef20d9c | 555 | return string(buf, end, sym, spec); |
332d2e78 LT |
556 | } |
557 | ||
cf3b429b JP |
558 | static noinline_for_stack |
559 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
560 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 561 | { |
8a27f7c9 | 562 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
563 | char *p = mac_addr; |
564 | int i; | |
bc7259a2 JP |
565 | char separator; |
566 | ||
567 | if (fmt[1] == 'F') { /* FDDI canonical format */ | |
bc7259a2 JP |
568 | separator = '-'; |
569 | } else { | |
bc7259a2 JP |
570 | separator = ':'; |
571 | } | |
dd45c9cf HH |
572 | |
573 | for (i = 0; i < 6; i++) { | |
55036ba7 | 574 | p = hex_byte_pack(p, addr[i]); |
8a27f7c9 | 575 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 576 | *p++ = separator; |
dd45c9cf HH |
577 | } |
578 | *p = '\0'; | |
579 | ||
fef20d9c | 580 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
581 | } |
582 | ||
cf3b429b JP |
583 | static noinline_for_stack |
584 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
585 | { |
586 | int i; | |
0159f24e JP |
587 | bool leading_zeros = (fmt[0] == 'i'); |
588 | int index; | |
589 | int step; | |
590 | ||
591 | switch (fmt[2]) { | |
592 | case 'h': | |
593 | #ifdef __BIG_ENDIAN | |
594 | index = 0; | |
595 | step = 1; | |
596 | #else | |
597 | index = 3; | |
598 | step = -1; | |
599 | #endif | |
600 | break; | |
601 | case 'l': | |
602 | index = 3; | |
603 | step = -1; | |
604 | break; | |
605 | case 'n': | |
606 | case 'b': | |
607 | default: | |
608 | index = 0; | |
609 | step = 1; | |
610 | break; | |
611 | } | |
8a27f7c9 JP |
612 | for (i = 0; i < 4; i++) { |
613 | char temp[3]; /* hold each IP quad in reverse order */ | |
0159f24e | 614 | int digits = put_dec_trunc(temp, addr[index]) - temp; |
8a27f7c9 JP |
615 | if (leading_zeros) { |
616 | if (digits < 3) | |
617 | *p++ = '0'; | |
618 | if (digits < 2) | |
619 | *p++ = '0'; | |
620 | } | |
621 | /* reverse the digits in the quad */ | |
622 | while (digits--) | |
623 | *p++ = temp[digits]; | |
624 | if (i < 3) | |
625 | *p++ = '.'; | |
0159f24e | 626 | index += step; |
8a27f7c9 | 627 | } |
8a27f7c9 | 628 | *p = '\0'; |
7b9186f5 | 629 | |
8a27f7c9 JP |
630 | return p; |
631 | } | |
632 | ||
cf3b429b JP |
633 | static noinline_for_stack |
634 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 635 | { |
7b9186f5 | 636 | int i, j, range; |
8a27f7c9 JP |
637 | unsigned char zerolength[8]; |
638 | int longest = 1; | |
639 | int colonpos = -1; | |
640 | u16 word; | |
7b9186f5 | 641 | u8 hi, lo; |
8a27f7c9 | 642 | bool needcolon = false; |
eb78cd26 JP |
643 | bool useIPv4; |
644 | struct in6_addr in6; | |
645 | ||
646 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
647 | ||
648 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
649 | |
650 | memset(zerolength, 0, sizeof(zerolength)); | |
651 | ||
652 | if (useIPv4) | |
653 | range = 6; | |
654 | else | |
655 | range = 8; | |
656 | ||
657 | /* find position of longest 0 run */ | |
658 | for (i = 0; i < range; i++) { | |
659 | for (j = i; j < range; j++) { | |
eb78cd26 | 660 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
661 | break; |
662 | zerolength[i]++; | |
663 | } | |
664 | } | |
665 | for (i = 0; i < range; i++) { | |
666 | if (zerolength[i] > longest) { | |
667 | longest = zerolength[i]; | |
668 | colonpos = i; | |
669 | } | |
670 | } | |
29cf519e JP |
671 | if (longest == 1) /* don't compress a single 0 */ |
672 | colonpos = -1; | |
689afa7d | 673 | |
8a27f7c9 JP |
674 | /* emit address */ |
675 | for (i = 0; i < range; i++) { | |
676 | if (i == colonpos) { | |
677 | if (needcolon || i == 0) | |
678 | *p++ = ':'; | |
679 | *p++ = ':'; | |
680 | needcolon = false; | |
681 | i += longest - 1; | |
682 | continue; | |
683 | } | |
684 | if (needcolon) { | |
685 | *p++ = ':'; | |
686 | needcolon = false; | |
687 | } | |
688 | /* hex u16 without leading 0s */ | |
eb78cd26 | 689 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
690 | hi = word >> 8; |
691 | lo = word & 0xff; | |
692 | if (hi) { | |
693 | if (hi > 0x0f) | |
55036ba7 | 694 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
695 | else |
696 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 697 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 698 | } |
b5ff992b | 699 | else if (lo > 0x0f) |
55036ba7 | 700 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
701 | else |
702 | *p++ = hex_asc_lo(lo); | |
703 | needcolon = true; | |
704 | } | |
705 | ||
706 | if (useIPv4) { | |
707 | if (needcolon) | |
708 | *p++ = ':'; | |
0159f24e | 709 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 710 | } |
8a27f7c9 | 711 | *p = '\0'; |
7b9186f5 | 712 | |
8a27f7c9 JP |
713 | return p; |
714 | } | |
715 | ||
cf3b429b JP |
716 | static noinline_for_stack |
717 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
718 | { |
719 | int i; | |
7b9186f5 | 720 | |
689afa7d | 721 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
722 | p = hex_byte_pack(p, *addr++); |
723 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 724 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
725 | *p++ = ':'; |
726 | } | |
727 | *p = '\0'; | |
7b9186f5 | 728 | |
8a27f7c9 JP |
729 | return p; |
730 | } | |
731 | ||
cf3b429b JP |
732 | static noinline_for_stack |
733 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
734 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
735 | { |
736 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
737 | ||
738 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 739 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 740 | else |
eb78cd26 | 741 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 742 | |
fef20d9c | 743 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
744 | } |
745 | ||
cf3b429b JP |
746 | static noinline_for_stack |
747 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
748 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 749 | { |
8a27f7c9 | 750 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 751 | |
0159f24e | 752 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 753 | |
fef20d9c | 754 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
755 | } |
756 | ||
cf3b429b JP |
757 | static noinline_for_stack |
758 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
759 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
760 | { |
761 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
762 | char *p = uuid; | |
763 | int i; | |
764 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
765 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
766 | const u8 *index = be; | |
767 | bool uc = false; | |
768 | ||
769 | switch (*(++fmt)) { | |
770 | case 'L': | |
771 | uc = true; /* fall-through */ | |
772 | case 'l': | |
773 | index = le; | |
774 | break; | |
775 | case 'B': | |
776 | uc = true; | |
777 | break; | |
778 | } | |
779 | ||
780 | for (i = 0; i < 16; i++) { | |
55036ba7 | 781 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
782 | switch (i) { |
783 | case 3: | |
784 | case 5: | |
785 | case 7: | |
786 | case 9: | |
787 | *p++ = '-'; | |
788 | break; | |
789 | } | |
790 | } | |
791 | ||
792 | *p = 0; | |
793 | ||
794 | if (uc) { | |
795 | p = uuid; | |
796 | do { | |
797 | *p = toupper(*p); | |
798 | } while (*(++p)); | |
799 | } | |
800 | ||
801 | return string(buf, end, uuid, spec); | |
802 | } | |
803 | ||
c8f44aff MM |
804 | static |
805 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
806 | struct printf_spec spec) | |
807 | { | |
808 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
809 | if (spec.field_width == -1) | |
810 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
811 | spec.base = 16; | |
812 | ||
813 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
814 | } | |
815 | ||
411f05f1 | 816 | int kptr_restrict __read_mostly; |
455cd5ab | 817 | |
4d8a743c LT |
818 | /* |
819 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
820 | * by an extra set of alphanumeric characters that are extended format | |
821 | * specifiers. | |
822 | * | |
332d2e78 LT |
823 | * Right now we handle: |
824 | * | |
0c8b946e FW |
825 | * - 'F' For symbolic function descriptor pointers with offset |
826 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
827 | * - 'S' For symbolic direct pointers with offset |
828 | * - 's' For symbolic direct pointers without offset | |
0f77a8d3 | 829 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
830 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
831 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dd45c9cf HH |
832 | * - 'M' For a 6-byte MAC address, it prints the address in the |
833 | * usual colon-separated hex notation | |
8a27f7c9 | 834 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 835 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 836 | * with a dash-separated hex notation |
8a27f7c9 JP |
837 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
838 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
839 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
840 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses | |
841 | * IPv6 omits the colons (01020304...0f) | |
842 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
0159f24e | 843 | * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order |
8a27f7c9 | 844 | * - 'I6c' for IPv6 addresses printed as specified by |
29cf519e | 845 | * http://tools.ietf.org/html/rfc5952 |
9ac6e44e JP |
846 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
847 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
848 | * Options for %pU are: | |
849 | * b big endian lower case hex (default) | |
850 | * B big endian UPPER case hex | |
851 | * l little endian lower case hex | |
852 | * L little endian UPPER case hex | |
853 | * big endian output byte order is: | |
854 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
855 | * little endian output byte order is: | |
856 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
857 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
858 | * call vsnprintf(->format, *->va_list). | |
859 | * Implements a "recursive vsnprintf". | |
860 | * Do not use this feature without some mechanism to verify the | |
861 | * correctness of the format string and va_list arguments. | |
455cd5ab | 862 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 863 | * - 'NF' For a netdev_features_t |
9ac6e44e | 864 | * |
332d2e78 LT |
865 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
866 | * function pointers are really function descriptors, which contain a | |
867 | * pointer to the real address. | |
4d8a743c | 868 | */ |
cf3b429b JP |
869 | static noinline_for_stack |
870 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
871 | struct printf_spec spec) | |
78a8bf69 | 872 | { |
9f36e2c4 | 873 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
874 | /* |
875 | * Print (null) with the same width as a pointer so it makes | |
876 | * tabular output look nice. | |
877 | */ | |
878 | if (spec.field_width == -1) | |
879 | spec.field_width = 2 * sizeof(void *); | |
fef20d9c | 880 | return string(buf, end, "(null)", spec); |
5e057981 | 881 | } |
d97106ab | 882 | |
0fe1ef24 LT |
883 | switch (*fmt) { |
884 | case 'F': | |
0c8b946e | 885 | case 'f': |
0fe1ef24 LT |
886 | ptr = dereference_function_descriptor(ptr); |
887 | /* Fallthrough */ | |
888 | case 'S': | |
9ac6e44e | 889 | case 's': |
0f77a8d3 | 890 | case 'B': |
0c8b946e | 891 | return symbol_string(buf, end, ptr, spec, *fmt); |
332d2e78 | 892 | case 'R': |
c7dabef8 | 893 | case 'r': |
fd95541e | 894 | return resource_string(buf, end, ptr, spec, fmt); |
8a27f7c9 JP |
895 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
896 | case 'm': /* Contiguous: 000102030405 */ | |
bc7259a2 | 897 | /* [mM]F (FDDI, bit reversed) */ |
8a27f7c9 JP |
898 | return mac_address_string(buf, end, ptr, spec, fmt); |
899 | case 'I': /* Formatted IP supported | |
900 | * 4: 1.2.3.4 | |
901 | * 6: 0001:0203:...:0708 | |
902 | * 6c: 1::708 or 1::1.2.3.4 | |
903 | */ | |
904 | case 'i': /* Contiguous: | |
905 | * 4: 001.002.003.004 | |
906 | * 6: 000102...0f | |
907 | */ | |
908 | switch (fmt[1]) { | |
909 | case '6': | |
910 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
911 | case '4': | |
912 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
913 | } | |
fef20d9c | 914 | break; |
9ac6e44e JP |
915 | case 'U': |
916 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 917 | case 'V': |
5756b76e JB |
918 | { |
919 | va_list va; | |
920 | ||
921 | va_copy(va, *((struct va_format *)ptr)->va); | |
922 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
923 | ((struct va_format *)ptr)->fmt, va); | |
924 | va_end(va); | |
925 | return buf; | |
926 | } | |
455cd5ab DR |
927 | case 'K': |
928 | /* | |
929 | * %pK cannot be used in IRQ context because its test | |
930 | * for CAP_SYSLOG would be meaningless. | |
931 | */ | |
932 | if (in_irq() || in_serving_softirq() || in_nmi()) { | |
933 | if (spec.field_width == -1) | |
934 | spec.field_width = 2 * sizeof(void *); | |
935 | return string(buf, end, "pK-error", spec); | |
455cd5ab | 936 | } |
26297607 JP |
937 | if (!((kptr_restrict == 0) || |
938 | (kptr_restrict == 1 && | |
939 | has_capability_noaudit(current, CAP_SYSLOG)))) | |
940 | ptr = NULL; | |
941 | break; | |
c8f44aff MM |
942 | case 'N': |
943 | switch (fmt[1]) { | |
944 | case 'F': | |
945 | return netdev_feature_string(buf, end, ptr, spec); | |
946 | } | |
947 | break; | |
fef20d9c FW |
948 | } |
949 | spec.flags |= SMALL; | |
950 | if (spec.field_width == -1) { | |
5e057981 | 951 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
952 | spec.flags |= ZEROPAD; |
953 | } | |
954 | spec.base = 16; | |
955 | ||
956 | return number(buf, end, (unsigned long) ptr, spec); | |
957 | } | |
958 | ||
959 | /* | |
960 | * Helper function to decode printf style format. | |
961 | * Each call decode a token from the format and return the | |
962 | * number of characters read (or likely the delta where it wants | |
963 | * to go on the next call). | |
964 | * The decoded token is returned through the parameters | |
965 | * | |
966 | * 'h', 'l', or 'L' for integer fields | |
967 | * 'z' support added 23/7/1999 S.H. | |
968 | * 'z' changed to 'Z' --davidm 1/25/99 | |
969 | * 't' added for ptrdiff_t | |
970 | * | |
971 | * @fmt: the format string | |
972 | * @type of the token returned | |
973 | * @flags: various flags such as +, -, # tokens.. | |
974 | * @field_width: overwritten width | |
975 | * @base: base of the number (octal, hex, ...) | |
976 | * @precision: precision of a number | |
977 | * @qualifier: qualifier of a number (long, size_t, ...) | |
978 | */ | |
cf3b429b JP |
979 | static noinline_for_stack |
980 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
981 | { |
982 | const char *start = fmt; | |
fef20d9c FW |
983 | |
984 | /* we finished early by reading the field width */ | |
ed681a91 | 985 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
986 | if (spec->field_width < 0) { |
987 | spec->field_width = -spec->field_width; | |
988 | spec->flags |= LEFT; | |
989 | } | |
990 | spec->type = FORMAT_TYPE_NONE; | |
991 | goto precision; | |
992 | } | |
993 | ||
994 | /* we finished early by reading the precision */ | |
995 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
996 | if (spec->precision < 0) | |
997 | spec->precision = 0; | |
998 | ||
999 | spec->type = FORMAT_TYPE_NONE; | |
1000 | goto qualifier; | |
1001 | } | |
1002 | ||
1003 | /* By default */ | |
1004 | spec->type = FORMAT_TYPE_NONE; | |
1005 | ||
1006 | for (; *fmt ; ++fmt) { | |
1007 | if (*fmt == '%') | |
1008 | break; | |
1009 | } | |
1010 | ||
1011 | /* Return the current non-format string */ | |
1012 | if (fmt != start || !*fmt) | |
1013 | return fmt - start; | |
1014 | ||
1015 | /* Process flags */ | |
1016 | spec->flags = 0; | |
1017 | ||
1018 | while (1) { /* this also skips first '%' */ | |
1019 | bool found = true; | |
1020 | ||
1021 | ++fmt; | |
1022 | ||
1023 | switch (*fmt) { | |
1024 | case '-': spec->flags |= LEFT; break; | |
1025 | case '+': spec->flags |= PLUS; break; | |
1026 | case ' ': spec->flags |= SPACE; break; | |
1027 | case '#': spec->flags |= SPECIAL; break; | |
1028 | case '0': spec->flags |= ZEROPAD; break; | |
1029 | default: found = false; | |
1030 | } | |
1031 | ||
1032 | if (!found) | |
1033 | break; | |
1034 | } | |
1035 | ||
1036 | /* get field width */ | |
1037 | spec->field_width = -1; | |
1038 | ||
1039 | if (isdigit(*fmt)) | |
1040 | spec->field_width = skip_atoi(&fmt); | |
1041 | else if (*fmt == '*') { | |
1042 | /* it's the next argument */ | |
ed681a91 | 1043 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1044 | return ++fmt - start; |
1045 | } | |
1046 | ||
1047 | precision: | |
1048 | /* get the precision */ | |
1049 | spec->precision = -1; | |
1050 | if (*fmt == '.') { | |
1051 | ++fmt; | |
1052 | if (isdigit(*fmt)) { | |
1053 | spec->precision = skip_atoi(&fmt); | |
1054 | if (spec->precision < 0) | |
1055 | spec->precision = 0; | |
1056 | } else if (*fmt == '*') { | |
1057 | /* it's the next argument */ | |
adf26f84 | 1058 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1059 | return ++fmt - start; |
1060 | } | |
1061 | } | |
1062 | ||
1063 | qualifier: | |
1064 | /* get the conversion qualifier */ | |
1065 | spec->qualifier = -1; | |
75fb8f26 AS |
1066 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1067 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1068 | spec->qualifier = *fmt++; |
1069 | if (unlikely(spec->qualifier == *fmt)) { | |
1070 | if (spec->qualifier == 'l') { | |
1071 | spec->qualifier = 'L'; | |
1072 | ++fmt; | |
1073 | } else if (spec->qualifier == 'h') { | |
1074 | spec->qualifier = 'H'; | |
1075 | ++fmt; | |
1076 | } | |
fef20d9c FW |
1077 | } |
1078 | } | |
1079 | ||
1080 | /* default base */ | |
1081 | spec->base = 10; | |
1082 | switch (*fmt) { | |
1083 | case 'c': | |
1084 | spec->type = FORMAT_TYPE_CHAR; | |
1085 | return ++fmt - start; | |
1086 | ||
1087 | case 's': | |
1088 | spec->type = FORMAT_TYPE_STR; | |
1089 | return ++fmt - start; | |
1090 | ||
1091 | case 'p': | |
1092 | spec->type = FORMAT_TYPE_PTR; | |
1093 | return fmt - start; | |
1094 | /* skip alnum */ | |
1095 | ||
1096 | case 'n': | |
1097 | spec->type = FORMAT_TYPE_NRCHARS; | |
1098 | return ++fmt - start; | |
1099 | ||
1100 | case '%': | |
1101 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1102 | return ++fmt - start; | |
1103 | ||
1104 | /* integer number formats - set up the flags and "break" */ | |
1105 | case 'o': | |
1106 | spec->base = 8; | |
1107 | break; | |
1108 | ||
1109 | case 'x': | |
1110 | spec->flags |= SMALL; | |
1111 | ||
1112 | case 'X': | |
1113 | spec->base = 16; | |
1114 | break; | |
1115 | ||
1116 | case 'd': | |
1117 | case 'i': | |
39e874f8 | 1118 | spec->flags |= SIGN; |
fef20d9c | 1119 | case 'u': |
4aa99606 | 1120 | break; |
fef20d9c FW |
1121 | |
1122 | default: | |
1123 | spec->type = FORMAT_TYPE_INVALID; | |
1124 | return fmt - start; | |
0fe1ef24 | 1125 | } |
fef20d9c FW |
1126 | |
1127 | if (spec->qualifier == 'L') | |
1128 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1129 | else if (spec->qualifier == 'l') { | |
39e874f8 | 1130 | if (spec->flags & SIGN) |
fef20d9c FW |
1131 | spec->type = FORMAT_TYPE_LONG; |
1132 | else | |
1133 | spec->type = FORMAT_TYPE_ULONG; | |
75fb8f26 | 1134 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1135 | spec->type = FORMAT_TYPE_SIZE_T; |
1136 | } else if (spec->qualifier == 't') { | |
1137 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 Z |
1138 | } else if (spec->qualifier == 'H') { |
1139 | if (spec->flags & SIGN) | |
1140 | spec->type = FORMAT_TYPE_BYTE; | |
1141 | else | |
1142 | spec->type = FORMAT_TYPE_UBYTE; | |
fef20d9c | 1143 | } else if (spec->qualifier == 'h') { |
39e874f8 | 1144 | if (spec->flags & SIGN) |
fef20d9c FW |
1145 | spec->type = FORMAT_TYPE_SHORT; |
1146 | else | |
1147 | spec->type = FORMAT_TYPE_USHORT; | |
1148 | } else { | |
39e874f8 | 1149 | if (spec->flags & SIGN) |
fef20d9c FW |
1150 | spec->type = FORMAT_TYPE_INT; |
1151 | else | |
1152 | spec->type = FORMAT_TYPE_UINT; | |
78a8bf69 | 1153 | } |
fef20d9c FW |
1154 | |
1155 | return ++fmt - start; | |
78a8bf69 LT |
1156 | } |
1157 | ||
1da177e4 LT |
1158 | /** |
1159 | * vsnprintf - Format a string and place it in a buffer | |
1160 | * @buf: The buffer to place the result into | |
1161 | * @size: The size of the buffer, including the trailing null space | |
1162 | * @fmt: The format string to use | |
1163 | * @args: Arguments for the format string | |
1164 | * | |
20036fdc | 1165 | * This function follows C99 vsnprintf, but has some extensions: |
91adcd2c SR |
1166 | * %pS output the name of a text symbol with offset |
1167 | * %ps output the name of a text symbol without offset | |
0c8b946e FW |
1168 | * %pF output the name of a function pointer with its offset |
1169 | * %pf output the name of a function pointer without its offset | |
0f77a8d3 | 1170 | * %pB output the name of a backtrace symbol with its offset |
8a79503a UKK |
1171 | * %pR output the address range in a struct resource with decoded flags |
1172 | * %pr output the address range in a struct resource with raw flags | |
1173 | * %pM output a 6-byte MAC address with colons | |
1174 | * %pm output a 6-byte MAC address without colons | |
1175 | * %pI4 print an IPv4 address without leading zeros | |
1176 | * %pi4 print an IPv4 address with leading zeros | |
1177 | * %pI6 print an IPv6 address with colons | |
1178 | * %pi6 print an IPv6 address without colons | |
f996f208 | 1179 | * %pI6c print an IPv6 address as specified by RFC 5952 |
8a79503a UKK |
1180 | * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper |
1181 | * case. | |
0efb4d20 | 1182 | * %n is ignored |
20036fdc | 1183 | * |
1da177e4 LT |
1184 | * The return value is the number of characters which would |
1185 | * be generated for the given input, excluding the trailing | |
1186 | * '\0', as per ISO C99. If you want to have the exact | |
1187 | * number of characters written into @buf as return value | |
72fd4a35 | 1188 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1189 | * return is greater than or equal to @size, the resulting |
1190 | * string is truncated. | |
1191 | * | |
ba1835eb | 1192 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1193 | */ |
1194 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1195 | { | |
1da177e4 | 1196 | unsigned long long num; |
d4be151b | 1197 | char *str, *end; |
fef20d9c | 1198 | struct printf_spec spec = {0}; |
1da177e4 | 1199 | |
f796937a JF |
1200 | /* Reject out-of-range values early. Large positive sizes are |
1201 | used for unknown buffer sizes. */ | |
2f30b1f9 | 1202 | if (WARN_ON_ONCE((int) size < 0)) |
1da177e4 | 1203 | return 0; |
1da177e4 LT |
1204 | |
1205 | str = buf; | |
f796937a | 1206 | end = buf + size; |
1da177e4 | 1207 | |
f796937a JF |
1208 | /* Make sure end is always >= buf */ |
1209 | if (end < buf) { | |
1210 | end = ((void *)-1); | |
1211 | size = end - buf; | |
1da177e4 LT |
1212 | } |
1213 | ||
fef20d9c FW |
1214 | while (*fmt) { |
1215 | const char *old_fmt = fmt; | |
d4be151b | 1216 | int read = format_decode(fmt, &spec); |
1da177e4 | 1217 | |
fef20d9c | 1218 | fmt += read; |
1da177e4 | 1219 | |
fef20d9c FW |
1220 | switch (spec.type) { |
1221 | case FORMAT_TYPE_NONE: { | |
1222 | int copy = read; | |
1223 | if (str < end) { | |
1224 | if (copy > end - str) | |
1225 | copy = end - str; | |
1226 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1227 | } |
fef20d9c FW |
1228 | str += read; |
1229 | break; | |
1da177e4 LT |
1230 | } |
1231 | ||
ed681a91 | 1232 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1233 | spec.field_width = va_arg(args, int); |
1234 | break; | |
1da177e4 | 1235 | |
fef20d9c FW |
1236 | case FORMAT_TYPE_PRECISION: |
1237 | spec.precision = va_arg(args, int); | |
1238 | break; | |
1da177e4 | 1239 | |
d4be151b AGR |
1240 | case FORMAT_TYPE_CHAR: { |
1241 | char c; | |
1242 | ||
fef20d9c FW |
1243 | if (!(spec.flags & LEFT)) { |
1244 | while (--spec.field_width > 0) { | |
f796937a | 1245 | if (str < end) |
1da177e4 LT |
1246 | *str = ' '; |
1247 | ++str; | |
1da177e4 | 1248 | |
fef20d9c FW |
1249 | } |
1250 | } | |
1251 | c = (unsigned char) va_arg(args, int); | |
1252 | if (str < end) | |
1253 | *str = c; | |
1254 | ++str; | |
1255 | while (--spec.field_width > 0) { | |
f796937a | 1256 | if (str < end) |
fef20d9c | 1257 | *str = ' '; |
1da177e4 | 1258 | ++str; |
fef20d9c FW |
1259 | } |
1260 | break; | |
d4be151b | 1261 | } |
1da177e4 | 1262 | |
fef20d9c FW |
1263 | case FORMAT_TYPE_STR: |
1264 | str = string(str, end, va_arg(args, char *), spec); | |
1265 | break; | |
1da177e4 | 1266 | |
fef20d9c FW |
1267 | case FORMAT_TYPE_PTR: |
1268 | str = pointer(fmt+1, str, end, va_arg(args, void *), | |
1269 | spec); | |
1270 | while (isalnum(*fmt)) | |
1271 | fmt++; | |
1272 | break; | |
1da177e4 | 1273 | |
fef20d9c FW |
1274 | case FORMAT_TYPE_PERCENT_CHAR: |
1275 | if (str < end) | |
1276 | *str = '%'; | |
1277 | ++str; | |
1278 | break; | |
1da177e4 | 1279 | |
fef20d9c FW |
1280 | case FORMAT_TYPE_INVALID: |
1281 | if (str < end) | |
1282 | *str = '%'; | |
1283 | ++str; | |
fef20d9c FW |
1284 | break; |
1285 | ||
1286 | case FORMAT_TYPE_NRCHARS: { | |
ef0658f3 | 1287 | u8 qualifier = spec.qualifier; |
fef20d9c FW |
1288 | |
1289 | if (qualifier == 'l') { | |
1290 | long *ip = va_arg(args, long *); | |
1291 | *ip = (str - buf); | |
75fb8f26 | 1292 | } else if (_tolower(qualifier) == 'z') { |
fef20d9c FW |
1293 | size_t *ip = va_arg(args, size_t *); |
1294 | *ip = (str - buf); | |
1295 | } else { | |
1296 | int *ip = va_arg(args, int *); | |
1297 | *ip = (str - buf); | |
1298 | } | |
1299 | break; | |
1da177e4 | 1300 | } |
fef20d9c FW |
1301 | |
1302 | default: | |
1303 | switch (spec.type) { | |
1304 | case FORMAT_TYPE_LONG_LONG: | |
1305 | num = va_arg(args, long long); | |
1306 | break; | |
1307 | case FORMAT_TYPE_ULONG: | |
1308 | num = va_arg(args, unsigned long); | |
1309 | break; | |
1310 | case FORMAT_TYPE_LONG: | |
1311 | num = va_arg(args, long); | |
1312 | break; | |
1313 | case FORMAT_TYPE_SIZE_T: | |
1314 | num = va_arg(args, size_t); | |
1315 | break; | |
1316 | case FORMAT_TYPE_PTRDIFF: | |
1317 | num = va_arg(args, ptrdiff_t); | |
1318 | break; | |
a4e94ef0 Z |
1319 | case FORMAT_TYPE_UBYTE: |
1320 | num = (unsigned char) va_arg(args, int); | |
1321 | break; | |
1322 | case FORMAT_TYPE_BYTE: | |
1323 | num = (signed char) va_arg(args, int); | |
1324 | break; | |
fef20d9c FW |
1325 | case FORMAT_TYPE_USHORT: |
1326 | num = (unsigned short) va_arg(args, int); | |
1327 | break; | |
1328 | case FORMAT_TYPE_SHORT: | |
1329 | num = (short) va_arg(args, int); | |
1330 | break; | |
39e874f8 FW |
1331 | case FORMAT_TYPE_INT: |
1332 | num = (int) va_arg(args, int); | |
fef20d9c FW |
1333 | break; |
1334 | default: | |
1335 | num = va_arg(args, unsigned int); | |
1336 | } | |
1337 | ||
1338 | str = number(str, end, num, spec); | |
1da177e4 | 1339 | } |
1da177e4 | 1340 | } |
fef20d9c | 1341 | |
f796937a JF |
1342 | if (size > 0) { |
1343 | if (str < end) | |
1344 | *str = '\0'; | |
1345 | else | |
0a6047ee | 1346 | end[-1] = '\0'; |
f796937a | 1347 | } |
fef20d9c | 1348 | |
f796937a | 1349 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 1350 | return str-buf; |
fef20d9c | 1351 | |
1da177e4 | 1352 | } |
1da177e4 LT |
1353 | EXPORT_SYMBOL(vsnprintf); |
1354 | ||
1355 | /** | |
1356 | * vscnprintf - Format a string and place it in a buffer | |
1357 | * @buf: The buffer to place the result into | |
1358 | * @size: The size of the buffer, including the trailing null space | |
1359 | * @fmt: The format string to use | |
1360 | * @args: Arguments for the format string | |
1361 | * | |
1362 | * The return value is the number of characters which have been written into | |
b921c69f | 1363 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
1364 | * returns 0. |
1365 | * | |
ba1835eb | 1366 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
1367 | * |
1368 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1369 | */ |
1370 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1371 | { | |
1372 | int i; | |
1373 | ||
7b9186f5 AGR |
1374 | i = vsnprintf(buf, size, fmt, args); |
1375 | ||
b921c69f AA |
1376 | if (likely(i < size)) |
1377 | return i; | |
1378 | if (size != 0) | |
1379 | return size - 1; | |
1380 | return 0; | |
1da177e4 | 1381 | } |
1da177e4 LT |
1382 | EXPORT_SYMBOL(vscnprintf); |
1383 | ||
1384 | /** | |
1385 | * snprintf - Format a string and place it in a buffer | |
1386 | * @buf: The buffer to place the result into | |
1387 | * @size: The size of the buffer, including the trailing null space | |
1388 | * @fmt: The format string to use | |
1389 | * @...: Arguments for the format string | |
1390 | * | |
1391 | * The return value is the number of characters which would be | |
1392 | * generated for the given input, excluding the trailing null, | |
1393 | * as per ISO C99. If the return is greater than or equal to | |
1394 | * @size, the resulting string is truncated. | |
20036fdc AK |
1395 | * |
1396 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1397 | */ |
7b9186f5 | 1398 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1399 | { |
1400 | va_list args; | |
1401 | int i; | |
1402 | ||
1403 | va_start(args, fmt); | |
7b9186f5 | 1404 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 1405 | va_end(args); |
7b9186f5 | 1406 | |
1da177e4 LT |
1407 | return i; |
1408 | } | |
1da177e4 LT |
1409 | EXPORT_SYMBOL(snprintf); |
1410 | ||
1411 | /** | |
1412 | * scnprintf - Format a string and place it in a buffer | |
1413 | * @buf: The buffer to place the result into | |
1414 | * @size: The size of the buffer, including the trailing null space | |
1415 | * @fmt: The format string to use | |
1416 | * @...: Arguments for the format string | |
1417 | * | |
1418 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 1419 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
1420 | */ |
1421 | ||
7b9186f5 | 1422 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
1423 | { |
1424 | va_list args; | |
1425 | int i; | |
1426 | ||
1427 | va_start(args, fmt); | |
b921c69f | 1428 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 1429 | va_end(args); |
7b9186f5 | 1430 | |
b921c69f | 1431 | return i; |
1da177e4 LT |
1432 | } |
1433 | EXPORT_SYMBOL(scnprintf); | |
1434 | ||
1435 | /** | |
1436 | * vsprintf - Format a string and place it in a buffer | |
1437 | * @buf: The buffer to place the result into | |
1438 | * @fmt: The format string to use | |
1439 | * @args: Arguments for the format string | |
1440 | * | |
1441 | * The function returns the number of characters written | |
72fd4a35 | 1442 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
1443 | * buffer overflows. |
1444 | * | |
ba1835eb | 1445 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
1446 | * |
1447 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
1448 | */ |
1449 | int vsprintf(char *buf, const char *fmt, va_list args) | |
1450 | { | |
1451 | return vsnprintf(buf, INT_MAX, fmt, args); | |
1452 | } | |
1da177e4 LT |
1453 | EXPORT_SYMBOL(vsprintf); |
1454 | ||
1455 | /** | |
1456 | * sprintf - Format a string and place it in a buffer | |
1457 | * @buf: The buffer to place the result into | |
1458 | * @fmt: The format string to use | |
1459 | * @...: Arguments for the format string | |
1460 | * | |
1461 | * The function returns the number of characters written | |
72fd4a35 | 1462 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 1463 | * buffer overflows. |
20036fdc AK |
1464 | * |
1465 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 1466 | */ |
7b9186f5 | 1467 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
1468 | { |
1469 | va_list args; | |
1470 | int i; | |
1471 | ||
1472 | va_start(args, fmt); | |
7b9186f5 | 1473 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 1474 | va_end(args); |
7b9186f5 | 1475 | |
1da177e4 LT |
1476 | return i; |
1477 | } | |
1da177e4 LT |
1478 | EXPORT_SYMBOL(sprintf); |
1479 | ||
4370aa4a LJ |
1480 | #ifdef CONFIG_BINARY_PRINTF |
1481 | /* | |
1482 | * bprintf service: | |
1483 | * vbin_printf() - VA arguments to binary data | |
1484 | * bstr_printf() - Binary data to text string | |
1485 | */ | |
1486 | ||
1487 | /** | |
1488 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
1489 | * @bin_buf: The buffer to place args' binary value | |
1490 | * @size: The size of the buffer(by words(32bits), not characters) | |
1491 | * @fmt: The format string to use | |
1492 | * @args: Arguments for the format string | |
1493 | * | |
1494 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
1495 | * is skiped. | |
1496 | * | |
1497 | * The return value is the number of words(32bits) which would be generated for | |
1498 | * the given input. | |
1499 | * | |
1500 | * NOTE: | |
1501 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
1502 | * valid for bstr_printf(). | |
1503 | */ | |
1504 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
1505 | { | |
fef20d9c | 1506 | struct printf_spec spec = {0}; |
4370aa4a | 1507 | char *str, *end; |
4370aa4a LJ |
1508 | |
1509 | str = (char *)bin_buf; | |
1510 | end = (char *)(bin_buf + size); | |
1511 | ||
1512 | #define save_arg(type) \ | |
1513 | do { \ | |
1514 | if (sizeof(type) == 8) { \ | |
1515 | unsigned long long value; \ | |
1516 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
1517 | value = va_arg(args, unsigned long long); \ | |
1518 | if (str + sizeof(type) <= end) { \ | |
1519 | *(u32 *)str = *(u32 *)&value; \ | |
1520 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
1521 | } \ | |
1522 | } else { \ | |
1523 | unsigned long value; \ | |
1524 | str = PTR_ALIGN(str, sizeof(type)); \ | |
1525 | value = va_arg(args, int); \ | |
1526 | if (str + sizeof(type) <= end) \ | |
1527 | *(typeof(type) *)str = (type)value; \ | |
1528 | } \ | |
1529 | str += sizeof(type); \ | |
1530 | } while (0) | |
1531 | ||
fef20d9c | 1532 | while (*fmt) { |
d4be151b | 1533 | int read = format_decode(fmt, &spec); |
4370aa4a | 1534 | |
fef20d9c | 1535 | fmt += read; |
4370aa4a | 1536 | |
fef20d9c FW |
1537 | switch (spec.type) { |
1538 | case FORMAT_TYPE_NONE: | |
d4be151b AGR |
1539 | case FORMAT_TYPE_INVALID: |
1540 | case FORMAT_TYPE_PERCENT_CHAR: | |
fef20d9c FW |
1541 | break; |
1542 | ||
ed681a91 | 1543 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1544 | case FORMAT_TYPE_PRECISION: |
1545 | save_arg(int); | |
1546 | break; | |
1547 | ||
1548 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 1549 | save_arg(char); |
fef20d9c FW |
1550 | break; |
1551 | ||
1552 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
1553 | const char *save_str = va_arg(args, char *); |
1554 | size_t len; | |
6c356634 | 1555 | |
4370aa4a LJ |
1556 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
1557 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 1558 | save_str = "(null)"; |
6c356634 AGR |
1559 | len = strlen(save_str) + 1; |
1560 | if (str + len < end) | |
1561 | memcpy(str, save_str, len); | |
1562 | str += len; | |
fef20d9c | 1563 | break; |
4370aa4a | 1564 | } |
fef20d9c FW |
1565 | |
1566 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
1567 | save_arg(void *); |
1568 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 1569 | while (isalnum(*fmt)) |
4370aa4a | 1570 | fmt++; |
fef20d9c FW |
1571 | break; |
1572 | ||
fef20d9c | 1573 | case FORMAT_TYPE_NRCHARS: { |
4370aa4a | 1574 | /* skip %n 's argument */ |
ef0658f3 | 1575 | u8 qualifier = spec.qualifier; |
4370aa4a LJ |
1576 | void *skip_arg; |
1577 | if (qualifier == 'l') | |
1578 | skip_arg = va_arg(args, long *); | |
75fb8f26 | 1579 | else if (_tolower(qualifier) == 'z') |
4370aa4a LJ |
1580 | skip_arg = va_arg(args, size_t *); |
1581 | else | |
1582 | skip_arg = va_arg(args, int *); | |
fef20d9c | 1583 | break; |
4370aa4a | 1584 | } |
fef20d9c FW |
1585 | |
1586 | default: | |
1587 | switch (spec.type) { | |
1588 | ||
1589 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 1590 | save_arg(long long); |
fef20d9c FW |
1591 | break; |
1592 | case FORMAT_TYPE_ULONG: | |
1593 | case FORMAT_TYPE_LONG: | |
4370aa4a | 1594 | save_arg(unsigned long); |
fef20d9c FW |
1595 | break; |
1596 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 1597 | save_arg(size_t); |
fef20d9c FW |
1598 | break; |
1599 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 1600 | save_arg(ptrdiff_t); |
fef20d9c | 1601 | break; |
a4e94ef0 Z |
1602 | case FORMAT_TYPE_UBYTE: |
1603 | case FORMAT_TYPE_BYTE: | |
1604 | save_arg(char); | |
1605 | break; | |
fef20d9c FW |
1606 | case FORMAT_TYPE_USHORT: |
1607 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 1608 | save_arg(short); |
fef20d9c FW |
1609 | break; |
1610 | default: | |
4370aa4a | 1611 | save_arg(int); |
fef20d9c | 1612 | } |
4370aa4a LJ |
1613 | } |
1614 | } | |
fef20d9c | 1615 | |
7b9186f5 | 1616 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 1617 | #undef save_arg |
4370aa4a LJ |
1618 | } |
1619 | EXPORT_SYMBOL_GPL(vbin_printf); | |
1620 | ||
1621 | /** | |
1622 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
1623 | * @buf: The buffer to place the result into | |
1624 | * @size: The size of the buffer, including the trailing null space | |
1625 | * @fmt: The format string to use | |
1626 | * @bin_buf: Binary arguments for the format string | |
1627 | * | |
1628 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
1629 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
1630 | * a binary buffer that generated by vbin_printf. | |
1631 | * | |
1632 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 1633 | * see vsnprintf comment for details. |
4370aa4a LJ |
1634 | * |
1635 | * The return value is the number of characters which would | |
1636 | * be generated for the given input, excluding the trailing | |
1637 | * '\0', as per ISO C99. If you want to have the exact | |
1638 | * number of characters written into @buf as return value | |
1639 | * (not including the trailing '\0'), use vscnprintf(). If the | |
1640 | * return is greater than or equal to @size, the resulting | |
1641 | * string is truncated. | |
1642 | */ | |
1643 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
1644 | { | |
fef20d9c | 1645 | struct printf_spec spec = {0}; |
d4be151b AGR |
1646 | char *str, *end; |
1647 | const char *args = (const char *)bin_buf; | |
4370aa4a | 1648 | |
2f30b1f9 | 1649 | if (WARN_ON_ONCE((int) size < 0)) |
4370aa4a | 1650 | return 0; |
4370aa4a LJ |
1651 | |
1652 | str = buf; | |
1653 | end = buf + size; | |
1654 | ||
1655 | #define get_arg(type) \ | |
1656 | ({ \ | |
1657 | typeof(type) value; \ | |
1658 | if (sizeof(type) == 8) { \ | |
1659 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
1660 | *(u32 *)&value = *(u32 *)args; \ | |
1661 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
1662 | } else { \ | |
1663 | args = PTR_ALIGN(args, sizeof(type)); \ | |
1664 | value = *(typeof(type) *)args; \ | |
1665 | } \ | |
1666 | args += sizeof(type); \ | |
1667 | value; \ | |
1668 | }) | |
1669 | ||
1670 | /* Make sure end is always >= buf */ | |
1671 | if (end < buf) { | |
1672 | end = ((void *)-1); | |
1673 | size = end - buf; | |
1674 | } | |
1675 | ||
fef20d9c | 1676 | while (*fmt) { |
fef20d9c | 1677 | const char *old_fmt = fmt; |
d4be151b | 1678 | int read = format_decode(fmt, &spec); |
4370aa4a | 1679 | |
fef20d9c | 1680 | fmt += read; |
4370aa4a | 1681 | |
fef20d9c FW |
1682 | switch (spec.type) { |
1683 | case FORMAT_TYPE_NONE: { | |
1684 | int copy = read; | |
1685 | if (str < end) { | |
1686 | if (copy > end - str) | |
1687 | copy = end - str; | |
1688 | memcpy(str, old_fmt, copy); | |
4370aa4a | 1689 | } |
fef20d9c FW |
1690 | str += read; |
1691 | break; | |
4370aa4a LJ |
1692 | } |
1693 | ||
ed681a91 | 1694 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1695 | spec.field_width = get_arg(int); |
1696 | break; | |
4370aa4a | 1697 | |
fef20d9c FW |
1698 | case FORMAT_TYPE_PRECISION: |
1699 | spec.precision = get_arg(int); | |
1700 | break; | |
4370aa4a | 1701 | |
d4be151b AGR |
1702 | case FORMAT_TYPE_CHAR: { |
1703 | char c; | |
1704 | ||
fef20d9c FW |
1705 | if (!(spec.flags & LEFT)) { |
1706 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
1707 | if (str < end) |
1708 | *str = ' '; | |
1709 | ++str; | |
1710 | } | |
1711 | } | |
1712 | c = (unsigned char) get_arg(char); | |
1713 | if (str < end) | |
1714 | *str = c; | |
1715 | ++str; | |
fef20d9c | 1716 | while (--spec.field_width > 0) { |
4370aa4a LJ |
1717 | if (str < end) |
1718 | *str = ' '; | |
1719 | ++str; | |
1720 | } | |
fef20d9c | 1721 | break; |
d4be151b | 1722 | } |
4370aa4a | 1723 | |
fef20d9c | 1724 | case FORMAT_TYPE_STR: { |
4370aa4a | 1725 | const char *str_arg = args; |
d4be151b | 1726 | args += strlen(str_arg) + 1; |
fef20d9c FW |
1727 | str = string(str, end, (char *)str_arg, spec); |
1728 | break; | |
4370aa4a LJ |
1729 | } |
1730 | ||
fef20d9c FW |
1731 | case FORMAT_TYPE_PTR: |
1732 | str = pointer(fmt+1, str, end, get_arg(void *), spec); | |
1733 | while (isalnum(*fmt)) | |
4370aa4a | 1734 | fmt++; |
fef20d9c | 1735 | break; |
4370aa4a | 1736 | |
fef20d9c | 1737 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 1738 | case FORMAT_TYPE_INVALID: |
4370aa4a LJ |
1739 | if (str < end) |
1740 | *str = '%'; | |
1741 | ++str; | |
fef20d9c FW |
1742 | break; |
1743 | ||
1744 | case FORMAT_TYPE_NRCHARS: | |
1745 | /* skip */ | |
1746 | break; | |
1747 | ||
d4be151b AGR |
1748 | default: { |
1749 | unsigned long long num; | |
1750 | ||
fef20d9c FW |
1751 | switch (spec.type) { |
1752 | ||
1753 | case FORMAT_TYPE_LONG_LONG: | |
1754 | num = get_arg(long long); | |
1755 | break; | |
1756 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
1757 | case FORMAT_TYPE_LONG: |
1758 | num = get_arg(unsigned long); | |
1759 | break; | |
1760 | case FORMAT_TYPE_SIZE_T: | |
1761 | num = get_arg(size_t); | |
1762 | break; | |
1763 | case FORMAT_TYPE_PTRDIFF: | |
1764 | num = get_arg(ptrdiff_t); | |
1765 | break; | |
a4e94ef0 Z |
1766 | case FORMAT_TYPE_UBYTE: |
1767 | num = get_arg(unsigned char); | |
1768 | break; | |
1769 | case FORMAT_TYPE_BYTE: | |
1770 | num = get_arg(signed char); | |
1771 | break; | |
fef20d9c FW |
1772 | case FORMAT_TYPE_USHORT: |
1773 | num = get_arg(unsigned short); | |
1774 | break; | |
1775 | case FORMAT_TYPE_SHORT: | |
1776 | num = get_arg(short); | |
1777 | break; | |
1778 | case FORMAT_TYPE_UINT: | |
1779 | num = get_arg(unsigned int); | |
1780 | break; | |
1781 | default: | |
1782 | num = get_arg(int); | |
1783 | } | |
1784 | ||
1785 | str = number(str, end, num, spec); | |
d4be151b AGR |
1786 | } /* default: */ |
1787 | } /* switch(spec.type) */ | |
1788 | } /* while(*fmt) */ | |
fef20d9c | 1789 | |
4370aa4a LJ |
1790 | if (size > 0) { |
1791 | if (str < end) | |
1792 | *str = '\0'; | |
1793 | else | |
1794 | end[-1] = '\0'; | |
1795 | } | |
fef20d9c | 1796 | |
4370aa4a LJ |
1797 | #undef get_arg |
1798 | ||
1799 | /* the trailing null byte doesn't count towards the total */ | |
1800 | return str - buf; | |
1801 | } | |
1802 | EXPORT_SYMBOL_GPL(bstr_printf); | |
1803 | ||
1804 | /** | |
1805 | * bprintf - Parse a format string and place args' binary value in a buffer | |
1806 | * @bin_buf: The buffer to place args' binary value | |
1807 | * @size: The size of the buffer(by words(32bits), not characters) | |
1808 | * @fmt: The format string to use | |
1809 | * @...: Arguments for the format string | |
1810 | * | |
1811 | * The function returns the number of words(u32) written | |
1812 | * into @bin_buf. | |
1813 | */ | |
1814 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
1815 | { | |
1816 | va_list args; | |
1817 | int ret; | |
1818 | ||
1819 | va_start(args, fmt); | |
1820 | ret = vbin_printf(bin_buf, size, fmt, args); | |
1821 | va_end(args); | |
7b9186f5 | 1822 | |
4370aa4a LJ |
1823 | return ret; |
1824 | } | |
1825 | EXPORT_SYMBOL_GPL(bprintf); | |
1826 | ||
1827 | #endif /* CONFIG_BINARY_PRINTF */ | |
1828 | ||
1da177e4 LT |
1829 | /** |
1830 | * vsscanf - Unformat a buffer into a list of arguments | |
1831 | * @buf: input buffer | |
1832 | * @fmt: format of buffer | |
1833 | * @args: arguments | |
1834 | */ | |
7b9186f5 | 1835 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
1836 | { |
1837 | const char *str = buf; | |
1838 | char *next; | |
1839 | char digit; | |
1840 | int num = 0; | |
ef0658f3 JP |
1841 | u8 qualifier; |
1842 | u8 base; | |
1843 | s16 field_width; | |
d4be151b | 1844 | bool is_sign; |
1da177e4 | 1845 | |
7b9186f5 | 1846 | while (*fmt && *str) { |
1da177e4 LT |
1847 | /* skip any white space in format */ |
1848 | /* white space in format matchs any amount of | |
1849 | * white space, including none, in the input. | |
1850 | */ | |
1851 | if (isspace(*fmt)) { | |
e7d2860b AGR |
1852 | fmt = skip_spaces(++fmt); |
1853 | str = skip_spaces(str); | |
1da177e4 LT |
1854 | } |
1855 | ||
1856 | /* anything that is not a conversion must match exactly */ | |
1857 | if (*fmt != '%' && *fmt) { | |
1858 | if (*fmt++ != *str++) | |
1859 | break; | |
1860 | continue; | |
1861 | } | |
1862 | ||
1863 | if (!*fmt) | |
1864 | break; | |
1865 | ++fmt; | |
7b9186f5 | 1866 | |
1da177e4 LT |
1867 | /* skip this conversion. |
1868 | * advance both strings to next white space | |
1869 | */ | |
1870 | if (*fmt == '*') { | |
8fccae2c | 1871 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
1872 | fmt++; |
1873 | while (!isspace(*str) && *str) | |
1874 | str++; | |
1875 | continue; | |
1876 | } | |
1877 | ||
1878 | /* get field width */ | |
1879 | field_width = -1; | |
1880 | if (isdigit(*fmt)) | |
1881 | field_width = skip_atoi(&fmt); | |
1882 | ||
1883 | /* get conversion qualifier */ | |
1884 | qualifier = -1; | |
75fb8f26 AS |
1885 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1886 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
1887 | qualifier = *fmt++; |
1888 | if (unlikely(qualifier == *fmt)) { | |
1889 | if (qualifier == 'h') { | |
1890 | qualifier = 'H'; | |
1891 | fmt++; | |
1892 | } else if (qualifier == 'l') { | |
1893 | qualifier = 'L'; | |
1894 | fmt++; | |
1895 | } | |
1896 | } | |
1897 | } | |
1da177e4 LT |
1898 | |
1899 | if (!*fmt || !*str) | |
1900 | break; | |
1901 | ||
d4be151b AGR |
1902 | base = 10; |
1903 | is_sign = 0; | |
1904 | ||
7b9186f5 | 1905 | switch (*fmt++) { |
1da177e4 LT |
1906 | case 'c': |
1907 | { | |
7b9186f5 | 1908 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
1909 | if (field_width == -1) |
1910 | field_width = 1; | |
1911 | do { | |
1912 | *s++ = *str++; | |
1913 | } while (--field_width > 0 && *str); | |
1914 | num++; | |
1915 | } | |
1916 | continue; | |
1917 | case 's': | |
1918 | { | |
7b9186f5 AGR |
1919 | char *s = (char *)va_arg(args, char *); |
1920 | if (field_width == -1) | |
4be929be | 1921 | field_width = SHRT_MAX; |
1da177e4 | 1922 | /* first, skip leading white space in buffer */ |
e7d2860b | 1923 | str = skip_spaces(str); |
1da177e4 LT |
1924 | |
1925 | /* now copy until next white space */ | |
7b9186f5 | 1926 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 1927 | *s++ = *str++; |
1da177e4 LT |
1928 | *s = '\0'; |
1929 | num++; | |
1930 | } | |
1931 | continue; | |
1932 | case 'n': | |
1933 | /* return number of characters read so far */ | |
1934 | { | |
7b9186f5 | 1935 | int *i = (int *)va_arg(args, int*); |
1da177e4 LT |
1936 | *i = str - buf; |
1937 | } | |
1938 | continue; | |
1939 | case 'o': | |
1940 | base = 8; | |
1941 | break; | |
1942 | case 'x': | |
1943 | case 'X': | |
1944 | base = 16; | |
1945 | break; | |
1946 | case 'i': | |
7b9186f5 | 1947 | base = 0; |
1da177e4 LT |
1948 | case 'd': |
1949 | is_sign = 1; | |
1950 | case 'u': | |
1951 | break; | |
1952 | case '%': | |
1953 | /* looking for '%' in str */ | |
7b9186f5 | 1954 | if (*str++ != '%') |
1da177e4 LT |
1955 | return num; |
1956 | continue; | |
1957 | default: | |
1958 | /* invalid format; stop here */ | |
1959 | return num; | |
1960 | } | |
1961 | ||
1962 | /* have some sort of integer conversion. | |
1963 | * first, skip white space in buffer. | |
1964 | */ | |
e7d2860b | 1965 | str = skip_spaces(str); |
1da177e4 LT |
1966 | |
1967 | digit = *str; | |
1968 | if (is_sign && digit == '-') | |
1969 | digit = *(str + 1); | |
1970 | ||
1971 | if (!digit | |
7b9186f5 AGR |
1972 | || (base == 16 && !isxdigit(digit)) |
1973 | || (base == 10 && !isdigit(digit)) | |
1974 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
1975 | || (base == 0 && !isdigit(digit))) | |
1976 | break; | |
1da177e4 | 1977 | |
7b9186f5 | 1978 | switch (qualifier) { |
1da177e4 LT |
1979 | case 'H': /* that's 'hh' in format */ |
1980 | if (is_sign) { | |
7b9186f5 AGR |
1981 | signed char *s = (signed char *)va_arg(args, signed char *); |
1982 | *s = (signed char)simple_strtol(str, &next, base); | |
1da177e4 | 1983 | } else { |
7b9186f5 AGR |
1984 | unsigned char *s = (unsigned char *)va_arg(args, unsigned char *); |
1985 | *s = (unsigned char)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1986 | } |
1987 | break; | |
1988 | case 'h': | |
1989 | if (is_sign) { | |
7b9186f5 AGR |
1990 | short *s = (short *)va_arg(args, short *); |
1991 | *s = (short)simple_strtol(str, &next, base); | |
1da177e4 | 1992 | } else { |
7b9186f5 AGR |
1993 | unsigned short *s = (unsigned short *)va_arg(args, unsigned short *); |
1994 | *s = (unsigned short)simple_strtoul(str, &next, base); | |
1da177e4 LT |
1995 | } |
1996 | break; | |
1997 | case 'l': | |
1998 | if (is_sign) { | |
7b9186f5 AGR |
1999 | long *l = (long *)va_arg(args, long *); |
2000 | *l = simple_strtol(str, &next, base); | |
1da177e4 | 2001 | } else { |
7b9186f5 AGR |
2002 | unsigned long *l = (unsigned long *)va_arg(args, unsigned long *); |
2003 | *l = simple_strtoul(str, &next, base); | |
1da177e4 LT |
2004 | } |
2005 | break; | |
2006 | case 'L': | |
2007 | if (is_sign) { | |
7b9186f5 AGR |
2008 | long long *l = (long long *)va_arg(args, long long *); |
2009 | *l = simple_strtoll(str, &next, base); | |
1da177e4 | 2010 | } else { |
7b9186f5 AGR |
2011 | unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *); |
2012 | *l = simple_strtoull(str, &next, base); | |
1da177e4 LT |
2013 | } |
2014 | break; | |
2015 | case 'Z': | |
2016 | case 'z': | |
2017 | { | |
7b9186f5 AGR |
2018 | size_t *s = (size_t *)va_arg(args, size_t *); |
2019 | *s = (size_t)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2020 | } |
2021 | break; | |
2022 | default: | |
2023 | if (is_sign) { | |
7b9186f5 AGR |
2024 | int *i = (int *)va_arg(args, int *); |
2025 | *i = (int)simple_strtol(str, &next, base); | |
1da177e4 | 2026 | } else { |
7b9186f5 AGR |
2027 | unsigned int *i = (unsigned int *)va_arg(args, unsigned int*); |
2028 | *i = (unsigned int)simple_strtoul(str, &next, base); | |
1da177e4 LT |
2029 | } |
2030 | break; | |
2031 | } | |
2032 | num++; | |
2033 | ||
2034 | if (!next) | |
2035 | break; | |
2036 | str = next; | |
2037 | } | |
c6b40d16 JB |
2038 | |
2039 | /* | |
2040 | * Now we've come all the way through so either the input string or the | |
2041 | * format ended. In the former case, there can be a %n at the current | |
2042 | * position in the format that needs to be filled. | |
2043 | */ | |
2044 | if (*fmt == '%' && *(fmt + 1) == 'n') { | |
2045 | int *p = (int *)va_arg(args, int *); | |
2046 | *p = str - buf; | |
2047 | } | |
2048 | ||
1da177e4 LT |
2049 | return num; |
2050 | } | |
1da177e4 LT |
2051 | EXPORT_SYMBOL(vsscanf); |
2052 | ||
2053 | /** | |
2054 | * sscanf - Unformat a buffer into a list of arguments | |
2055 | * @buf: input buffer | |
2056 | * @fmt: formatting of buffer | |
2057 | * @...: resulting arguments | |
2058 | */ | |
7b9186f5 | 2059 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2060 | { |
2061 | va_list args; | |
2062 | int i; | |
2063 | ||
7b9186f5 AGR |
2064 | va_start(args, fmt); |
2065 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2066 | va_end(args); |
7b9186f5 | 2067 | |
1da177e4 LT |
2068 | return i; |
2069 | } | |
1da177e4 | 2070 | EXPORT_SYMBOL(sscanf); |