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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> | |
0d1d7a55 | 20 | #include <linux/clk.h> |
900cca29 | 21 | #include <linux/clk-provider.h> |
8bc3bcc9 | 22 | #include <linux/module.h> /* for KSYM_SYMBOL_LEN */ |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/kernel.h> | |
0fe1ef24 | 27 | #include <linux/kallsyms.h> |
53809751 | 28 | #include <linux/math64.h> |
0fe1ef24 | 29 | #include <linux/uaccess.h> |
332d2e78 | 30 | #include <linux/ioport.h> |
4b6ccca7 | 31 | #include <linux/dcache.h> |
312b4e22 | 32 | #include <linux/cred.h> |
8a27f7c9 | 33 | #include <net/addrconf.h> |
1031bc58 DM |
34 | #ifdef CONFIG_BLOCK |
35 | #include <linux/blkdev.h> | |
36 | #endif | |
1da177e4 | 37 | |
4e57b681 | 38 | #include <asm/page.h> /* for PAGE_SIZE */ |
deac93df | 39 | #include <asm/sections.h> /* for dereference_function_descriptor() */ |
7c43d9a3 | 40 | #include <asm/byteorder.h> /* cpu_to_le16 */ |
1da177e4 | 41 | |
71dca95d | 42 | #include <linux/string_helpers.h> |
1dff46d6 | 43 | #include "kstrtox.h" |
aa46a63e | 44 | |
1da177e4 | 45 | /** |
922ac25c | 46 | * simple_strtoull - convert a string to an unsigned long long |
1da177e4 LT |
47 | * @cp: The start of the string |
48 | * @endp: A pointer to the end of the parsed string will be placed here | |
49 | * @base: The number base to use | |
462e4711 EZ |
50 | * |
51 | * This function is obsolete. Please use kstrtoull instead. | |
1da177e4 | 52 | */ |
922ac25c | 53 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
1da177e4 | 54 | { |
1dff46d6 AD |
55 | unsigned long long result; |
56 | unsigned int rv; | |
aa46a63e | 57 | |
1dff46d6 AD |
58 | cp = _parse_integer_fixup_radix(cp, &base); |
59 | rv = _parse_integer(cp, base, &result); | |
60 | /* FIXME */ | |
61 | cp += (rv & ~KSTRTOX_OVERFLOW); | |
aa46a63e | 62 | |
1da177e4 LT |
63 | if (endp) |
64 | *endp = (char *)cp; | |
7b9186f5 | 65 | |
1da177e4 LT |
66 | return result; |
67 | } | |
922ac25c | 68 | EXPORT_SYMBOL(simple_strtoull); |
1da177e4 LT |
69 | |
70 | /** | |
922ac25c | 71 | * simple_strtoul - convert a string to an unsigned long |
1da177e4 LT |
72 | * @cp: The start of the string |
73 | * @endp: A pointer to the end of the parsed string will be placed here | |
74 | * @base: The number base to use | |
462e4711 EZ |
75 | * |
76 | * This function is obsolete. Please use kstrtoul instead. | |
1da177e4 | 77 | */ |
922ac25c | 78 | unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base) |
1da177e4 | 79 | { |
922ac25c | 80 | return simple_strtoull(cp, endp, base); |
1da177e4 | 81 | } |
922ac25c | 82 | EXPORT_SYMBOL(simple_strtoul); |
1da177e4 LT |
83 | |
84 | /** | |
922ac25c | 85 | * simple_strtol - convert a string to a signed long |
1da177e4 LT |
86 | * @cp: The start of the string |
87 | * @endp: A pointer to the end of the parsed string will be placed here | |
88 | * @base: The number base to use | |
462e4711 EZ |
89 | * |
90 | * This function is obsolete. Please use kstrtol instead. | |
1da177e4 | 91 | */ |
922ac25c | 92 | long simple_strtol(const char *cp, char **endp, unsigned int base) |
1da177e4 | 93 | { |
922ac25c AGR |
94 | if (*cp == '-') |
95 | return -simple_strtoul(cp + 1, endp, base); | |
7b9186f5 | 96 | |
922ac25c | 97 | return simple_strtoul(cp, endp, base); |
1da177e4 | 98 | } |
922ac25c | 99 | EXPORT_SYMBOL(simple_strtol); |
1da177e4 LT |
100 | |
101 | /** | |
102 | * simple_strtoll - convert a string to a signed long long | |
103 | * @cp: The start of the string | |
104 | * @endp: A pointer to the end of the parsed string will be placed here | |
105 | * @base: The number base to use | |
462e4711 EZ |
106 | * |
107 | * This function is obsolete. Please use kstrtoll instead. | |
1da177e4 | 108 | */ |
22d27051 | 109 | long long simple_strtoll(const char *cp, char **endp, unsigned int base) |
1da177e4 | 110 | { |
7b9186f5 | 111 | if (*cp == '-') |
22d27051 | 112 | return -simple_strtoull(cp + 1, endp, base); |
7b9186f5 | 113 | |
22d27051 | 114 | return simple_strtoull(cp, endp, base); |
1da177e4 | 115 | } |
98d5ce0d | 116 | EXPORT_SYMBOL(simple_strtoll); |
1da177e4 | 117 | |
cf3b429b JP |
118 | static noinline_for_stack |
119 | int skip_atoi(const char **s) | |
1da177e4 | 120 | { |
7b9186f5 | 121 | int i = 0; |
1da177e4 | 122 | |
43e5b666 | 123 | do { |
1da177e4 | 124 | i = i*10 + *((*s)++) - '0'; |
43e5b666 | 125 | } while (isdigit(**s)); |
7b9186f5 | 126 | |
1da177e4 LT |
127 | return i; |
128 | } | |
129 | ||
7c43d9a3 RV |
130 | /* |
131 | * Decimal conversion is by far the most typical, and is used for | |
132 | * /proc and /sys data. This directly impacts e.g. top performance | |
133 | * with many processes running. We optimize it for speed by emitting | |
134 | * two characters at a time, using a 200 byte lookup table. This | |
135 | * roughly halves the number of multiplications compared to computing | |
136 | * the digits one at a time. Implementation strongly inspired by the | |
137 | * previous version, which in turn used ideas described at | |
138 | * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission | |
139 | * from the author, Douglas W. Jones). | |
140 | * | |
141 | * It turns out there is precisely one 26 bit fixed-point | |
142 | * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32 | |
143 | * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual | |
144 | * range happens to be somewhat larger (x <= 1073741898), but that's | |
145 | * irrelevant for our purpose. | |
146 | * | |
147 | * For dividing a number in the range [10^4, 10^6-1] by 100, we still | |
148 | * need a 32x32->64 bit multiply, so we simply use the same constant. | |
149 | * | |
150 | * For dividing a number in the range [100, 10^4-1] by 100, there are | |
151 | * several options. The simplest is (x * 0x147b) >> 19, which is valid | |
152 | * for all x <= 43698. | |
133fd9f5 | 153 | */ |
4277eedd | 154 | |
7c43d9a3 RV |
155 | static const u16 decpair[100] = { |
156 | #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030) | |
157 | _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9), | |
158 | _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19), | |
159 | _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29), | |
160 | _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39), | |
161 | _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49), | |
162 | _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59), | |
163 | _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69), | |
164 | _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79), | |
165 | _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89), | |
166 | _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99), | |
167 | #undef _ | |
168 | }; | |
169 | ||
170 | /* | |
171 | * This will print a single '0' even if r == 0, since we would | |
675cf53c RV |
172 | * immediately jump to out_r where two 0s would be written but only |
173 | * one of them accounted for in buf. This is needed by ip4_string | |
174 | * below. All other callers pass a non-zero value of r. | |
7c43d9a3 | 175 | */ |
cf3b429b | 176 | static noinline_for_stack |
7c43d9a3 | 177 | char *put_dec_trunc8(char *buf, unsigned r) |
4277eedd | 178 | { |
7c43d9a3 RV |
179 | unsigned q; |
180 | ||
181 | /* 1 <= r < 10^8 */ | |
182 | if (r < 100) | |
183 | goto out_r; | |
184 | ||
185 | /* 100 <= r < 10^8 */ | |
186 | q = (r * (u64)0x28f5c29) >> 32; | |
187 | *((u16 *)buf) = decpair[r - 100*q]; | |
188 | buf += 2; | |
189 | ||
190 | /* 1 <= q < 10^6 */ | |
191 | if (q < 100) | |
192 | goto out_q; | |
193 | ||
194 | /* 100 <= q < 10^6 */ | |
195 | r = (q * (u64)0x28f5c29) >> 32; | |
196 | *((u16 *)buf) = decpair[q - 100*r]; | |
197 | buf += 2; | |
198 | ||
199 | /* 1 <= r < 10^4 */ | |
200 | if (r < 100) | |
201 | goto out_r; | |
202 | ||
203 | /* 100 <= r < 10^4 */ | |
204 | q = (r * 0x147b) >> 19; | |
205 | *((u16 *)buf) = decpair[r - 100*q]; | |
206 | buf += 2; | |
207 | out_q: | |
208 | /* 1 <= q < 100 */ | |
209 | r = q; | |
210 | out_r: | |
211 | /* 1 <= r < 100 */ | |
212 | *((u16 *)buf) = decpair[r]; | |
675cf53c | 213 | buf += r < 10 ? 1 : 2; |
4277eedd DV |
214 | return buf; |
215 | } | |
133fd9f5 | 216 | |
7c43d9a3 | 217 | #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64 |
cf3b429b | 218 | static noinline_for_stack |
7c43d9a3 | 219 | char *put_dec_full8(char *buf, unsigned r) |
4277eedd | 220 | { |
133fd9f5 DV |
221 | unsigned q; |
222 | ||
7c43d9a3 RV |
223 | /* 0 <= r < 10^8 */ |
224 | q = (r * (u64)0x28f5c29) >> 32; | |
225 | *((u16 *)buf) = decpair[r - 100*q]; | |
226 | buf += 2; | |
4277eedd | 227 | |
7c43d9a3 RV |
228 | /* 0 <= q < 10^6 */ |
229 | r = (q * (u64)0x28f5c29) >> 32; | |
230 | *((u16 *)buf) = decpair[q - 100*r]; | |
231 | buf += 2; | |
7b9186f5 | 232 | |
7c43d9a3 RV |
233 | /* 0 <= r < 10^4 */ |
234 | q = (r * 0x147b) >> 19; | |
235 | *((u16 *)buf) = decpair[r - 100*q]; | |
236 | buf += 2; | |
133fd9f5 | 237 | |
7c43d9a3 RV |
238 | /* 0 <= q < 100 */ |
239 | *((u16 *)buf) = decpair[q]; | |
240 | buf += 2; | |
241 | return buf; | |
242 | } | |
133fd9f5 | 243 | |
7c43d9a3 | 244 | static noinline_for_stack |
133fd9f5 DV |
245 | char *put_dec(char *buf, unsigned long long n) |
246 | { | |
7c43d9a3 RV |
247 | if (n >= 100*1000*1000) |
248 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
249 | /* 1 <= n <= 1.6e11 */ | |
250 | if (n >= 100*1000*1000) | |
251 | buf = put_dec_full8(buf, do_div(n, 100*1000*1000)); | |
252 | /* 1 <= n < 1e8 */ | |
133fd9f5 | 253 | return put_dec_trunc8(buf, n); |
4277eedd | 254 | } |
133fd9f5 | 255 | |
7c43d9a3 | 256 | #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64 |
133fd9f5 | 257 | |
7c43d9a3 RV |
258 | static void |
259 | put_dec_full4(char *buf, unsigned r) | |
4277eedd | 260 | { |
7c43d9a3 RV |
261 | unsigned q; |
262 | ||
263 | /* 0 <= r < 10^4 */ | |
264 | q = (r * 0x147b) >> 19; | |
265 | *((u16 *)buf) = decpair[r - 100*q]; | |
266 | buf += 2; | |
267 | /* 0 <= q < 100 */ | |
268 | *((u16 *)buf) = decpair[q]; | |
2359172a GS |
269 | } |
270 | ||
271 | /* | |
272 | * Call put_dec_full4 on x % 10000, return x / 10000. | |
273 | * The approximation x/10000 == (x * 0x346DC5D7) >> 43 | |
274 | * holds for all x < 1,128,869,999. The largest value this | |
275 | * helper will ever be asked to convert is 1,125,520,955. | |
7c43d9a3 | 276 | * (second call in the put_dec code, assuming n is all-ones). |
2359172a | 277 | */ |
7c43d9a3 | 278 | static noinline_for_stack |
2359172a GS |
279 | unsigned put_dec_helper4(char *buf, unsigned x) |
280 | { | |
281 | uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43; | |
282 | ||
283 | put_dec_full4(buf, x - q * 10000); | |
284 | return q; | |
4277eedd DV |
285 | } |
286 | ||
133fd9f5 DV |
287 | /* Based on code by Douglas W. Jones found at |
288 | * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> | |
289 | * (with permission from the author). | |
290 | * Performs no 64-bit division and hence should be fast on 32-bit machines. | |
291 | */ | |
292 | static | |
293 | char *put_dec(char *buf, unsigned long long n) | |
294 | { | |
295 | uint32_t d3, d2, d1, q, h; | |
296 | ||
297 | if (n < 100*1000*1000) | |
298 | return put_dec_trunc8(buf, n); | |
299 | ||
300 | d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */ | |
301 | h = (n >> 32); | |
302 | d2 = (h ) & 0xffff; | |
303 | d3 = (h >> 16); /* implicit "& 0xffff" */ | |
304 | ||
7c43d9a3 RV |
305 | /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 |
306 | = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ | |
133fd9f5 | 307 | q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff); |
2359172a GS |
308 | q = put_dec_helper4(buf, q); |
309 | ||
310 | q += 7671 * d3 + 9496 * d2 + 6 * d1; | |
311 | q = put_dec_helper4(buf+4, q); | |
312 | ||
313 | q += 4749 * d3 + 42 * d2; | |
314 | q = put_dec_helper4(buf+8, q); | |
133fd9f5 | 315 | |
2359172a GS |
316 | q += 281 * d3; |
317 | buf += 12; | |
318 | if (q) | |
319 | buf = put_dec_trunc8(buf, q); | |
320 | else while (buf[-1] == '0') | |
133fd9f5 DV |
321 | --buf; |
322 | ||
323 | return buf; | |
324 | } | |
325 | ||
326 | #endif | |
327 | ||
1ac101a5 KH |
328 | /* |
329 | * Convert passed number to decimal string. | |
330 | * Returns the length of string. On buffer overflow, returns 0. | |
331 | * | |
332 | * If speed is not important, use snprintf(). It's easy to read the code. | |
333 | */ | |
334 | int num_to_str(char *buf, int size, unsigned long long num) | |
335 | { | |
7c43d9a3 RV |
336 | /* put_dec requires 2-byte alignment of the buffer. */ |
337 | char tmp[sizeof(num) * 3] __aligned(2); | |
1ac101a5 KH |
338 | int idx, len; |
339 | ||
133fd9f5 DV |
340 | /* put_dec() may work incorrectly for num = 0 (generate "", not "0") */ |
341 | if (num <= 9) { | |
342 | tmp[0] = '0' + num; | |
343 | len = 1; | |
344 | } else { | |
345 | len = put_dec(tmp, num) - tmp; | |
346 | } | |
1ac101a5 KH |
347 | |
348 | if (len > size) | |
349 | return 0; | |
350 | for (idx = 0; idx < len; ++idx) | |
351 | buf[idx] = tmp[len - idx - 1]; | |
133fd9f5 | 352 | return len; |
1ac101a5 KH |
353 | } |
354 | ||
51be17df | 355 | #define SIGN 1 /* unsigned/signed, must be 1 */ |
d1c1b121 | 356 | #define LEFT 2 /* left justified */ |
1da177e4 LT |
357 | #define PLUS 4 /* show plus */ |
358 | #define SPACE 8 /* space if plus */ | |
d1c1b121 | 359 | #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */ |
b89dc5d6 BH |
360 | #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ |
361 | #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ | |
1da177e4 | 362 | |
fef20d9c FW |
363 | enum format_type { |
364 | FORMAT_TYPE_NONE, /* Just a string part */ | |
ed681a91 | 365 | FORMAT_TYPE_WIDTH, |
fef20d9c FW |
366 | FORMAT_TYPE_PRECISION, |
367 | FORMAT_TYPE_CHAR, | |
368 | FORMAT_TYPE_STR, | |
369 | FORMAT_TYPE_PTR, | |
370 | FORMAT_TYPE_PERCENT_CHAR, | |
371 | FORMAT_TYPE_INVALID, | |
372 | FORMAT_TYPE_LONG_LONG, | |
373 | FORMAT_TYPE_ULONG, | |
374 | FORMAT_TYPE_LONG, | |
a4e94ef0 Z |
375 | FORMAT_TYPE_UBYTE, |
376 | FORMAT_TYPE_BYTE, | |
fef20d9c FW |
377 | FORMAT_TYPE_USHORT, |
378 | FORMAT_TYPE_SHORT, | |
379 | FORMAT_TYPE_UINT, | |
380 | FORMAT_TYPE_INT, | |
fef20d9c FW |
381 | FORMAT_TYPE_SIZE_T, |
382 | FORMAT_TYPE_PTRDIFF | |
383 | }; | |
384 | ||
385 | struct printf_spec { | |
4e310fda | 386 | u8 type; /* format_type enum */ |
ef0658f3 | 387 | u8 flags; /* flags to number() */ |
4e310fda JP |
388 | u8 base; /* number base, 8, 10 or 16 only */ |
389 | u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */ | |
390 | s16 field_width; /* width of output field */ | |
391 | s16 precision; /* # of digits/chars */ | |
fef20d9c FW |
392 | }; |
393 | ||
cf3b429b JP |
394 | static noinline_for_stack |
395 | char *number(char *buf, char *end, unsigned long long num, | |
396 | struct printf_spec spec) | |
1da177e4 | 397 | { |
7c43d9a3 RV |
398 | /* put_dec requires 2-byte alignment of the buffer. */ |
399 | char tmp[3 * sizeof(num)] __aligned(2); | |
9b706aee DV |
400 | char sign; |
401 | char locase; | |
fef20d9c | 402 | int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10); |
1da177e4 | 403 | int i; |
7c203422 | 404 | bool is_zero = num == 0LL; |
1da177e4 | 405 | |
9b706aee DV |
406 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
407 | * produces same digits or (maybe lowercased) letters */ | |
fef20d9c FW |
408 | locase = (spec.flags & SMALL); |
409 | if (spec.flags & LEFT) | |
410 | spec.flags &= ~ZEROPAD; | |
1da177e4 | 411 | sign = 0; |
fef20d9c | 412 | if (spec.flags & SIGN) { |
7b9186f5 | 413 | if ((signed long long)num < 0) { |
1da177e4 | 414 | sign = '-'; |
7b9186f5 | 415 | num = -(signed long long)num; |
fef20d9c FW |
416 | spec.field_width--; |
417 | } else if (spec.flags & PLUS) { | |
1da177e4 | 418 | sign = '+'; |
fef20d9c FW |
419 | spec.field_width--; |
420 | } else if (spec.flags & SPACE) { | |
1da177e4 | 421 | sign = ' '; |
fef20d9c | 422 | spec.field_width--; |
1da177e4 LT |
423 | } |
424 | } | |
b39a7340 | 425 | if (need_pfx) { |
fef20d9c | 426 | if (spec.base == 16) |
7c203422 PC |
427 | spec.field_width -= 2; |
428 | else if (!is_zero) | |
fef20d9c | 429 | spec.field_width--; |
1da177e4 | 430 | } |
b39a7340 DV |
431 | |
432 | /* generate full string in tmp[], in reverse order */ | |
1da177e4 | 433 | i = 0; |
133fd9f5 | 434 | if (num < spec.base) |
3ea8d440 | 435 | tmp[i++] = hex_asc_upper[num] | locase; |
fef20d9c FW |
436 | else if (spec.base != 10) { /* 8 or 16 */ |
437 | int mask = spec.base - 1; | |
b39a7340 | 438 | int shift = 3; |
7b9186f5 AGR |
439 | |
440 | if (spec.base == 16) | |
441 | shift = 4; | |
b39a7340 | 442 | do { |
3ea8d440 | 443 | tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase); |
b39a7340 DV |
444 | num >>= shift; |
445 | } while (num); | |
4277eedd DV |
446 | } else { /* base 10 */ |
447 | i = put_dec(tmp, num) - tmp; | |
448 | } | |
b39a7340 DV |
449 | |
450 | /* printing 100 using %2d gives "100", not "00" */ | |
fef20d9c FW |
451 | if (i > spec.precision) |
452 | spec.precision = i; | |
b39a7340 | 453 | /* leading space padding */ |
fef20d9c | 454 | spec.field_width -= spec.precision; |
51be17df | 455 | if (!(spec.flags & (ZEROPAD | LEFT))) { |
7b9186f5 | 456 | while (--spec.field_width >= 0) { |
f796937a | 457 | if (buf < end) |
1da177e4 LT |
458 | *buf = ' '; |
459 | ++buf; | |
460 | } | |
461 | } | |
b39a7340 | 462 | /* sign */ |
1da177e4 | 463 | if (sign) { |
f796937a | 464 | if (buf < end) |
1da177e4 LT |
465 | *buf = sign; |
466 | ++buf; | |
467 | } | |
b39a7340 DV |
468 | /* "0x" / "0" prefix */ |
469 | if (need_pfx) { | |
7c203422 PC |
470 | if (spec.base == 16 || !is_zero) { |
471 | if (buf < end) | |
472 | *buf = '0'; | |
473 | ++buf; | |
474 | } | |
fef20d9c | 475 | if (spec.base == 16) { |
f796937a | 476 | if (buf < end) |
9b706aee | 477 | *buf = ('X' | locase); |
1da177e4 LT |
478 | ++buf; |
479 | } | |
480 | } | |
b39a7340 | 481 | /* zero or space padding */ |
fef20d9c | 482 | if (!(spec.flags & LEFT)) { |
d1c1b121 RV |
483 | char c = ' ' + (spec.flags & ZEROPAD); |
484 | BUILD_BUG_ON(' ' + ZEROPAD != '0'); | |
fef20d9c | 485 | while (--spec.field_width >= 0) { |
f796937a | 486 | if (buf < end) |
1da177e4 LT |
487 | *buf = c; |
488 | ++buf; | |
489 | } | |
490 | } | |
b39a7340 | 491 | /* hmm even more zero padding? */ |
fef20d9c | 492 | while (i <= --spec.precision) { |
f796937a | 493 | if (buf < end) |
1da177e4 LT |
494 | *buf = '0'; |
495 | ++buf; | |
496 | } | |
b39a7340 DV |
497 | /* actual digits of result */ |
498 | while (--i >= 0) { | |
f796937a | 499 | if (buf < end) |
1da177e4 LT |
500 | *buf = tmp[i]; |
501 | ++buf; | |
502 | } | |
b39a7340 | 503 | /* trailing space padding */ |
fef20d9c | 504 | while (--spec.field_width >= 0) { |
f796937a | 505 | if (buf < end) |
1da177e4 LT |
506 | *buf = ' '; |
507 | ++buf; | |
508 | } | |
7b9186f5 | 509 | |
1da177e4 LT |
510 | return buf; |
511 | } | |
512 | ||
cf3b429b JP |
513 | static noinline_for_stack |
514 | char *string(char *buf, char *end, const char *s, struct printf_spec spec) | |
0f9bfa56 LT |
515 | { |
516 | int len, i; | |
517 | ||
518 | if ((unsigned long)s < PAGE_SIZE) | |
0f4f81dc | 519 | s = "(null)"; |
0f9bfa56 | 520 | |
fef20d9c | 521 | len = strnlen(s, spec.precision); |
0f9bfa56 | 522 | |
fef20d9c FW |
523 | if (!(spec.flags & LEFT)) { |
524 | while (len < spec.field_width--) { | |
0f9bfa56 LT |
525 | if (buf < end) |
526 | *buf = ' '; | |
527 | ++buf; | |
528 | } | |
529 | } | |
530 | for (i = 0; i < len; ++i) { | |
531 | if (buf < end) | |
532 | *buf = *s; | |
533 | ++buf; ++s; | |
534 | } | |
fef20d9c | 535 | while (len < spec.field_width--) { |
0f9bfa56 LT |
536 | if (buf < end) |
537 | *buf = ' '; | |
538 | ++buf; | |
539 | } | |
7b9186f5 | 540 | |
0f9bfa56 LT |
541 | return buf; |
542 | } | |
543 | ||
cfccde04 | 544 | static void move_right(char *buf, char *end, unsigned len, unsigned spaces) |
4b6ccca7 AV |
545 | { |
546 | size_t size; | |
547 | if (buf >= end) /* nowhere to put anything */ | |
548 | return; | |
549 | size = end - buf; | |
550 | if (size <= spaces) { | |
551 | memset(buf, ' ', size); | |
552 | return; | |
553 | } | |
554 | if (len) { | |
555 | if (len > size - spaces) | |
556 | len = size - spaces; | |
557 | memmove(buf + spaces, buf, len); | |
558 | } | |
559 | memset(buf, ' ', spaces); | |
560 | } | |
561 | ||
cfccde04 RV |
562 | /* |
563 | * Handle field width padding for a string. | |
564 | * @buf: current buffer position | |
565 | * @n: length of string | |
566 | * @end: end of output buffer | |
567 | * @spec: for field width and flags | |
568 | * Returns: new buffer position after padding. | |
569 | */ | |
570 | static noinline_for_stack | |
571 | char *widen_string(char *buf, int n, char *end, struct printf_spec spec) | |
572 | { | |
573 | unsigned spaces; | |
574 | ||
575 | if (likely(n >= spec.field_width)) | |
576 | return buf; | |
577 | /* we want to pad the sucker */ | |
578 | spaces = spec.field_width - n; | |
579 | if (!(spec.flags & LEFT)) { | |
580 | move_right(buf - n, end, n, spaces); | |
581 | return buf + spaces; | |
582 | } | |
583 | while (spaces--) { | |
584 | if (buf < end) | |
585 | *buf = ' '; | |
586 | ++buf; | |
587 | } | |
588 | return buf; | |
589 | } | |
590 | ||
4b6ccca7 AV |
591 | static noinline_for_stack |
592 | char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec, | |
593 | const char *fmt) | |
594 | { | |
595 | const char *array[4], *s; | |
596 | const struct dentry *p; | |
597 | int depth; | |
598 | int i, n; | |
599 | ||
600 | switch (fmt[1]) { | |
601 | case '2': case '3': case '4': | |
602 | depth = fmt[1] - '0'; | |
603 | break; | |
604 | default: | |
605 | depth = 1; | |
606 | } | |
607 | ||
608 | rcu_read_lock(); | |
609 | for (i = 0; i < depth; i++, d = p) { | |
610 | p = ACCESS_ONCE(d->d_parent); | |
611 | array[i] = ACCESS_ONCE(d->d_name.name); | |
612 | if (p == d) { | |
613 | if (i) | |
614 | array[i] = ""; | |
615 | i++; | |
616 | break; | |
617 | } | |
618 | } | |
619 | s = array[--i]; | |
620 | for (n = 0; n != spec.precision; n++, buf++) { | |
621 | char c = *s++; | |
622 | if (!c) { | |
623 | if (!i) | |
624 | break; | |
625 | c = '/'; | |
626 | s = array[--i]; | |
627 | } | |
628 | if (buf < end) | |
629 | *buf = c; | |
630 | } | |
631 | rcu_read_unlock(); | |
cfccde04 | 632 | return widen_string(buf, n, end, spec); |
4b6ccca7 AV |
633 | } |
634 | ||
1031bc58 DM |
635 | #ifdef CONFIG_BLOCK |
636 | static noinline_for_stack | |
637 | char *bdev_name(char *buf, char *end, struct block_device *bdev, | |
638 | struct printf_spec spec, const char *fmt) | |
639 | { | |
640 | struct gendisk *hd = bdev->bd_disk; | |
641 | ||
642 | buf = string(buf, end, hd->disk_name, spec); | |
643 | if (bdev->bd_part->partno) { | |
644 | if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) { | |
645 | if (buf < end) | |
646 | *buf = 'p'; | |
647 | buf++; | |
648 | } | |
649 | buf = number(buf, end, bdev->bd_part->partno, spec); | |
650 | } | |
651 | return buf; | |
652 | } | |
653 | #endif | |
654 | ||
cf3b429b JP |
655 | static noinline_for_stack |
656 | char *symbol_string(char *buf, char *end, void *ptr, | |
b0d33c2b | 657 | struct printf_spec spec, const char *fmt) |
0fe1ef24 | 658 | { |
b0d33c2b | 659 | unsigned long value; |
0fe1ef24 LT |
660 | #ifdef CONFIG_KALLSYMS |
661 | char sym[KSYM_SYMBOL_LEN]; | |
b0d33c2b JP |
662 | #endif |
663 | ||
664 | if (fmt[1] == 'R') | |
665 | ptr = __builtin_extract_return_addr(ptr); | |
666 | value = (unsigned long)ptr; | |
667 | ||
668 | #ifdef CONFIG_KALLSYMS | |
669 | if (*fmt == 'B') | |
0f77a8d3 | 670 | sprint_backtrace(sym, value); |
b0d33c2b | 671 | else if (*fmt != 'f' && *fmt != 's') |
0c8b946e FW |
672 | sprint_symbol(sym, value); |
673 | else | |
4796dd20 | 674 | sprint_symbol_no_offset(sym, value); |
7b9186f5 | 675 | |
fef20d9c | 676 | return string(buf, end, sym, spec); |
0fe1ef24 | 677 | #else |
7b9186f5 | 678 | spec.field_width = 2 * sizeof(void *); |
fef20d9c FW |
679 | spec.flags |= SPECIAL | SMALL | ZEROPAD; |
680 | spec.base = 16; | |
7b9186f5 | 681 | |
fef20d9c | 682 | return number(buf, end, value, spec); |
0fe1ef24 LT |
683 | #endif |
684 | } | |
685 | ||
cf3b429b JP |
686 | static noinline_for_stack |
687 | char *resource_string(char *buf, char *end, struct resource *res, | |
688 | struct printf_spec spec, const char *fmt) | |
332d2e78 LT |
689 | { |
690 | #ifndef IO_RSRC_PRINTK_SIZE | |
28405372 | 691 | #define IO_RSRC_PRINTK_SIZE 6 |
332d2e78 LT |
692 | #endif |
693 | ||
694 | #ifndef MEM_RSRC_PRINTK_SIZE | |
28405372 | 695 | #define MEM_RSRC_PRINTK_SIZE 10 |
332d2e78 | 696 | #endif |
4da0b66c | 697 | static const struct printf_spec io_spec = { |
fef20d9c | 698 | .base = 16, |
4da0b66c | 699 | .field_width = IO_RSRC_PRINTK_SIZE, |
fef20d9c FW |
700 | .precision = -1, |
701 | .flags = SPECIAL | SMALL | ZEROPAD, | |
702 | }; | |
4da0b66c BH |
703 | static const struct printf_spec mem_spec = { |
704 | .base = 16, | |
705 | .field_width = MEM_RSRC_PRINTK_SIZE, | |
706 | .precision = -1, | |
707 | .flags = SPECIAL | SMALL | ZEROPAD, | |
708 | }; | |
0f4050c7 BH |
709 | static const struct printf_spec bus_spec = { |
710 | .base = 16, | |
711 | .field_width = 2, | |
712 | .precision = -1, | |
713 | .flags = SMALL | ZEROPAD, | |
714 | }; | |
4da0b66c | 715 | static const struct printf_spec dec_spec = { |
c91d3376 BH |
716 | .base = 10, |
717 | .precision = -1, | |
718 | .flags = 0, | |
719 | }; | |
4da0b66c | 720 | static const struct printf_spec str_spec = { |
fd95541e BH |
721 | .field_width = -1, |
722 | .precision = 10, | |
723 | .flags = LEFT, | |
724 | }; | |
4da0b66c | 725 | static const struct printf_spec flag_spec = { |
fd95541e BH |
726 | .base = 16, |
727 | .precision = -1, | |
728 | .flags = SPECIAL | SMALL, | |
729 | }; | |
c7dabef8 BH |
730 | |
731 | /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8) | |
732 | * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */ | |
733 | #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4) | |
734 | #define FLAG_BUF_SIZE (2 * sizeof(res->flags)) | |
9d7cca04 | 735 | #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]") |
c7dabef8 BH |
736 | #define RAW_BUF_SIZE sizeof("[mem - flags 0x]") |
737 | char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE, | |
738 | 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)]; | |
739 | ||
332d2e78 | 740 | char *p = sym, *pend = sym + sizeof(sym); |
c7dabef8 | 741 | int decode = (fmt[0] == 'R') ? 1 : 0; |
4da0b66c | 742 | const struct printf_spec *specp; |
332d2e78 LT |
743 | |
744 | *p++ = '['; | |
4da0b66c | 745 | if (res->flags & IORESOURCE_IO) { |
c7dabef8 | 746 | p = string(p, pend, "io ", str_spec); |
4da0b66c BH |
747 | specp = &io_spec; |
748 | } else if (res->flags & IORESOURCE_MEM) { | |
c7dabef8 | 749 | p = string(p, pend, "mem ", str_spec); |
4da0b66c BH |
750 | specp = &mem_spec; |
751 | } else if (res->flags & IORESOURCE_IRQ) { | |
c7dabef8 | 752 | p = string(p, pend, "irq ", str_spec); |
4da0b66c BH |
753 | specp = &dec_spec; |
754 | } else if (res->flags & IORESOURCE_DMA) { | |
c7dabef8 | 755 | p = string(p, pend, "dma ", str_spec); |
4da0b66c | 756 | specp = &dec_spec; |
0f4050c7 BH |
757 | } else if (res->flags & IORESOURCE_BUS) { |
758 | p = string(p, pend, "bus ", str_spec); | |
759 | specp = &bus_spec; | |
4da0b66c | 760 | } else { |
c7dabef8 | 761 | p = string(p, pend, "??? ", str_spec); |
4da0b66c | 762 | specp = &mem_spec; |
c7dabef8 | 763 | decode = 0; |
fd95541e | 764 | } |
d19cb803 BH |
765 | if (decode && res->flags & IORESOURCE_UNSET) { |
766 | p = string(p, pend, "size ", str_spec); | |
767 | p = number(p, pend, resource_size(res), *specp); | |
768 | } else { | |
769 | p = number(p, pend, res->start, *specp); | |
770 | if (res->start != res->end) { | |
771 | *p++ = '-'; | |
772 | p = number(p, pend, res->end, *specp); | |
773 | } | |
c91d3376 | 774 | } |
c7dabef8 | 775 | if (decode) { |
fd95541e BH |
776 | if (res->flags & IORESOURCE_MEM_64) |
777 | p = string(p, pend, " 64bit", str_spec); | |
778 | if (res->flags & IORESOURCE_PREFETCH) | |
779 | p = string(p, pend, " pref", str_spec); | |
9d7cca04 BH |
780 | if (res->flags & IORESOURCE_WINDOW) |
781 | p = string(p, pend, " window", str_spec); | |
fd95541e BH |
782 | if (res->flags & IORESOURCE_DISABLED) |
783 | p = string(p, pend, " disabled", str_spec); | |
c7dabef8 BH |
784 | } else { |
785 | p = string(p, pend, " flags ", str_spec); | |
786 | p = number(p, pend, res->flags, flag_spec); | |
fd95541e | 787 | } |
332d2e78 | 788 | *p++ = ']'; |
c7dabef8 | 789 | *p = '\0'; |
332d2e78 | 790 | |
fef20d9c | 791 | return string(buf, end, sym, spec); |
332d2e78 LT |
792 | } |
793 | ||
31550a16 AS |
794 | static noinline_for_stack |
795 | char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
796 | const char *fmt) | |
797 | { | |
360603a1 | 798 | int i, len = 1; /* if we pass '%ph[CDN]', field width remains |
31550a16 AS |
799 | negative value, fallback to the default */ |
800 | char separator; | |
801 | ||
802 | if (spec.field_width == 0) | |
803 | /* nothing to print */ | |
804 | return buf; | |
805 | ||
806 | if (ZERO_OR_NULL_PTR(addr)) | |
807 | /* NULL pointer */ | |
808 | return string(buf, end, NULL, spec); | |
809 | ||
810 | switch (fmt[1]) { | |
811 | case 'C': | |
812 | separator = ':'; | |
813 | break; | |
814 | case 'D': | |
815 | separator = '-'; | |
816 | break; | |
817 | case 'N': | |
818 | separator = 0; | |
819 | break; | |
820 | default: | |
821 | separator = ' '; | |
822 | break; | |
823 | } | |
824 | ||
825 | if (spec.field_width > 0) | |
826 | len = min_t(int, spec.field_width, 64); | |
827 | ||
9c98f235 RV |
828 | for (i = 0; i < len; ++i) { |
829 | if (buf < end) | |
830 | *buf = hex_asc_hi(addr[i]); | |
831 | ++buf; | |
832 | if (buf < end) | |
833 | *buf = hex_asc_lo(addr[i]); | |
834 | ++buf; | |
31550a16 | 835 | |
9c98f235 RV |
836 | if (separator && i != len - 1) { |
837 | if (buf < end) | |
838 | *buf = separator; | |
839 | ++buf; | |
840 | } | |
31550a16 AS |
841 | } |
842 | ||
843 | return buf; | |
844 | } | |
845 | ||
dbc760bc TH |
846 | static noinline_for_stack |
847 | char *bitmap_string(char *buf, char *end, unsigned long *bitmap, | |
848 | struct printf_spec spec, const char *fmt) | |
849 | { | |
850 | const int CHUNKSZ = 32; | |
851 | int nr_bits = max_t(int, spec.field_width, 0); | |
852 | int i, chunksz; | |
853 | bool first = true; | |
854 | ||
855 | /* reused to print numbers */ | |
856 | spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 }; | |
857 | ||
858 | chunksz = nr_bits & (CHUNKSZ - 1); | |
859 | if (chunksz == 0) | |
860 | chunksz = CHUNKSZ; | |
861 | ||
862 | i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ; | |
863 | for (; i >= 0; i -= CHUNKSZ) { | |
864 | u32 chunkmask, val; | |
865 | int word, bit; | |
866 | ||
867 | chunkmask = ((1ULL << chunksz) - 1); | |
868 | word = i / BITS_PER_LONG; | |
869 | bit = i % BITS_PER_LONG; | |
870 | val = (bitmap[word] >> bit) & chunkmask; | |
871 | ||
872 | if (!first) { | |
873 | if (buf < end) | |
874 | *buf = ','; | |
875 | buf++; | |
876 | } | |
877 | first = false; | |
878 | ||
879 | spec.field_width = DIV_ROUND_UP(chunksz, 4); | |
880 | buf = number(buf, end, val, spec); | |
881 | ||
882 | chunksz = CHUNKSZ; | |
883 | } | |
884 | return buf; | |
885 | } | |
886 | ||
887 | static noinline_for_stack | |
888 | char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap, | |
889 | struct printf_spec spec, const char *fmt) | |
890 | { | |
891 | int nr_bits = max_t(int, spec.field_width, 0); | |
892 | /* current bit is 'cur', most recently seen range is [rbot, rtop] */ | |
893 | int cur, rbot, rtop; | |
894 | bool first = true; | |
895 | ||
896 | /* reused to print numbers */ | |
897 | spec = (struct printf_spec){ .base = 10 }; | |
898 | ||
899 | rbot = cur = find_first_bit(bitmap, nr_bits); | |
900 | while (cur < nr_bits) { | |
901 | rtop = cur; | |
902 | cur = find_next_bit(bitmap, nr_bits, cur + 1); | |
903 | if (cur < nr_bits && cur <= rtop + 1) | |
904 | continue; | |
905 | ||
906 | if (!first) { | |
907 | if (buf < end) | |
908 | *buf = ','; | |
909 | buf++; | |
910 | } | |
911 | first = false; | |
912 | ||
913 | buf = number(buf, end, rbot, spec); | |
914 | if (rbot < rtop) { | |
915 | if (buf < end) | |
916 | *buf = '-'; | |
917 | buf++; | |
918 | ||
919 | buf = number(buf, end, rtop, spec); | |
920 | } | |
921 | ||
922 | rbot = cur; | |
923 | } | |
924 | return buf; | |
925 | } | |
926 | ||
cf3b429b JP |
927 | static noinline_for_stack |
928 | char *mac_address_string(char *buf, char *end, u8 *addr, | |
929 | struct printf_spec spec, const char *fmt) | |
dd45c9cf | 930 | { |
8a27f7c9 | 931 | char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")]; |
dd45c9cf HH |
932 | char *p = mac_addr; |
933 | int i; | |
bc7259a2 | 934 | char separator; |
76597ff9 | 935 | bool reversed = false; |
bc7259a2 | 936 | |
76597ff9 AE |
937 | switch (fmt[1]) { |
938 | case 'F': | |
bc7259a2 | 939 | separator = '-'; |
76597ff9 AE |
940 | break; |
941 | ||
942 | case 'R': | |
943 | reversed = true; | |
944 | /* fall through */ | |
945 | ||
946 | default: | |
bc7259a2 | 947 | separator = ':'; |
76597ff9 | 948 | break; |
bc7259a2 | 949 | } |
dd45c9cf HH |
950 | |
951 | for (i = 0; i < 6; i++) { | |
76597ff9 AE |
952 | if (reversed) |
953 | p = hex_byte_pack(p, addr[5 - i]); | |
954 | else | |
955 | p = hex_byte_pack(p, addr[i]); | |
956 | ||
8a27f7c9 | 957 | if (fmt[0] == 'M' && i != 5) |
bc7259a2 | 958 | *p++ = separator; |
dd45c9cf HH |
959 | } |
960 | *p = '\0'; | |
961 | ||
fef20d9c | 962 | return string(buf, end, mac_addr, spec); |
dd45c9cf HH |
963 | } |
964 | ||
cf3b429b JP |
965 | static noinline_for_stack |
966 | char *ip4_string(char *p, const u8 *addr, const char *fmt) | |
8a27f7c9 JP |
967 | { |
968 | int i; | |
0159f24e JP |
969 | bool leading_zeros = (fmt[0] == 'i'); |
970 | int index; | |
971 | int step; | |
972 | ||
973 | switch (fmt[2]) { | |
974 | case 'h': | |
975 | #ifdef __BIG_ENDIAN | |
976 | index = 0; | |
977 | step = 1; | |
978 | #else | |
979 | index = 3; | |
980 | step = -1; | |
981 | #endif | |
982 | break; | |
983 | case 'l': | |
984 | index = 3; | |
985 | step = -1; | |
986 | break; | |
987 | case 'n': | |
988 | case 'b': | |
989 | default: | |
990 | index = 0; | |
991 | step = 1; | |
992 | break; | |
993 | } | |
8a27f7c9 | 994 | for (i = 0; i < 4; i++) { |
7c43d9a3 | 995 | char temp[4] __aligned(2); /* hold each IP quad in reverse order */ |
133fd9f5 | 996 | int digits = put_dec_trunc8(temp, addr[index]) - temp; |
8a27f7c9 JP |
997 | if (leading_zeros) { |
998 | if (digits < 3) | |
999 | *p++ = '0'; | |
1000 | if (digits < 2) | |
1001 | *p++ = '0'; | |
1002 | } | |
1003 | /* reverse the digits in the quad */ | |
1004 | while (digits--) | |
1005 | *p++ = temp[digits]; | |
1006 | if (i < 3) | |
1007 | *p++ = '.'; | |
0159f24e | 1008 | index += step; |
8a27f7c9 | 1009 | } |
8a27f7c9 | 1010 | *p = '\0'; |
7b9186f5 | 1011 | |
8a27f7c9 JP |
1012 | return p; |
1013 | } | |
1014 | ||
cf3b429b JP |
1015 | static noinline_for_stack |
1016 | char *ip6_compressed_string(char *p, const char *addr) | |
689afa7d | 1017 | { |
7b9186f5 | 1018 | int i, j, range; |
8a27f7c9 JP |
1019 | unsigned char zerolength[8]; |
1020 | int longest = 1; | |
1021 | int colonpos = -1; | |
1022 | u16 word; | |
7b9186f5 | 1023 | u8 hi, lo; |
8a27f7c9 | 1024 | bool needcolon = false; |
eb78cd26 JP |
1025 | bool useIPv4; |
1026 | struct in6_addr in6; | |
1027 | ||
1028 | memcpy(&in6, addr, sizeof(struct in6_addr)); | |
1029 | ||
1030 | useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6); | |
8a27f7c9 JP |
1031 | |
1032 | memset(zerolength, 0, sizeof(zerolength)); | |
1033 | ||
1034 | if (useIPv4) | |
1035 | range = 6; | |
1036 | else | |
1037 | range = 8; | |
1038 | ||
1039 | /* find position of longest 0 run */ | |
1040 | for (i = 0; i < range; i++) { | |
1041 | for (j = i; j < range; j++) { | |
eb78cd26 | 1042 | if (in6.s6_addr16[j] != 0) |
8a27f7c9 JP |
1043 | break; |
1044 | zerolength[i]++; | |
1045 | } | |
1046 | } | |
1047 | for (i = 0; i < range; i++) { | |
1048 | if (zerolength[i] > longest) { | |
1049 | longest = zerolength[i]; | |
1050 | colonpos = i; | |
1051 | } | |
1052 | } | |
29cf519e JP |
1053 | if (longest == 1) /* don't compress a single 0 */ |
1054 | colonpos = -1; | |
689afa7d | 1055 | |
8a27f7c9 JP |
1056 | /* emit address */ |
1057 | for (i = 0; i < range; i++) { | |
1058 | if (i == colonpos) { | |
1059 | if (needcolon || i == 0) | |
1060 | *p++ = ':'; | |
1061 | *p++ = ':'; | |
1062 | needcolon = false; | |
1063 | i += longest - 1; | |
1064 | continue; | |
1065 | } | |
1066 | if (needcolon) { | |
1067 | *p++ = ':'; | |
1068 | needcolon = false; | |
1069 | } | |
1070 | /* hex u16 without leading 0s */ | |
eb78cd26 | 1071 | word = ntohs(in6.s6_addr16[i]); |
8a27f7c9 JP |
1072 | hi = word >> 8; |
1073 | lo = word & 0xff; | |
1074 | if (hi) { | |
1075 | if (hi > 0x0f) | |
55036ba7 | 1076 | p = hex_byte_pack(p, hi); |
8a27f7c9 JP |
1077 | else |
1078 | *p++ = hex_asc_lo(hi); | |
55036ba7 | 1079 | p = hex_byte_pack(p, lo); |
8a27f7c9 | 1080 | } |
b5ff992b | 1081 | else if (lo > 0x0f) |
55036ba7 | 1082 | p = hex_byte_pack(p, lo); |
8a27f7c9 JP |
1083 | else |
1084 | *p++ = hex_asc_lo(lo); | |
1085 | needcolon = true; | |
1086 | } | |
1087 | ||
1088 | if (useIPv4) { | |
1089 | if (needcolon) | |
1090 | *p++ = ':'; | |
0159f24e | 1091 | p = ip4_string(p, &in6.s6_addr[12], "I4"); |
8a27f7c9 | 1092 | } |
8a27f7c9 | 1093 | *p = '\0'; |
7b9186f5 | 1094 | |
8a27f7c9 JP |
1095 | return p; |
1096 | } | |
1097 | ||
cf3b429b JP |
1098 | static noinline_for_stack |
1099 | char *ip6_string(char *p, const char *addr, const char *fmt) | |
8a27f7c9 JP |
1100 | { |
1101 | int i; | |
7b9186f5 | 1102 | |
689afa7d | 1103 | for (i = 0; i < 8; i++) { |
55036ba7 AS |
1104 | p = hex_byte_pack(p, *addr++); |
1105 | p = hex_byte_pack(p, *addr++); | |
8a27f7c9 | 1106 | if (fmt[0] == 'I' && i != 7) |
689afa7d HH |
1107 | *p++ = ':'; |
1108 | } | |
1109 | *p = '\0'; | |
7b9186f5 | 1110 | |
8a27f7c9 JP |
1111 | return p; |
1112 | } | |
1113 | ||
cf3b429b JP |
1114 | static noinline_for_stack |
1115 | char *ip6_addr_string(char *buf, char *end, const u8 *addr, | |
1116 | struct printf_spec spec, const char *fmt) | |
8a27f7c9 JP |
1117 | { |
1118 | char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")]; | |
1119 | ||
1120 | if (fmt[0] == 'I' && fmt[2] == 'c') | |
eb78cd26 | 1121 | ip6_compressed_string(ip6_addr, addr); |
8a27f7c9 | 1122 | else |
eb78cd26 | 1123 | ip6_string(ip6_addr, addr, fmt); |
689afa7d | 1124 | |
fef20d9c | 1125 | return string(buf, end, ip6_addr, spec); |
689afa7d HH |
1126 | } |
1127 | ||
cf3b429b JP |
1128 | static noinline_for_stack |
1129 | char *ip4_addr_string(char *buf, char *end, const u8 *addr, | |
1130 | struct printf_spec spec, const char *fmt) | |
4aa99606 | 1131 | { |
8a27f7c9 | 1132 | char ip4_addr[sizeof("255.255.255.255")]; |
4aa99606 | 1133 | |
0159f24e | 1134 | ip4_string(ip4_addr, addr, fmt); |
4aa99606 | 1135 | |
fef20d9c | 1136 | return string(buf, end, ip4_addr, spec); |
4aa99606 HH |
1137 | } |
1138 | ||
10679643 DB |
1139 | static noinline_for_stack |
1140 | char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa, | |
1141 | struct printf_spec spec, const char *fmt) | |
1142 | { | |
1143 | bool have_p = false, have_s = false, have_f = false, have_c = false; | |
1144 | char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + | |
1145 | sizeof(":12345") + sizeof("/123456789") + | |
1146 | sizeof("%1234567890")]; | |
1147 | char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr); | |
1148 | const u8 *addr = (const u8 *) &sa->sin6_addr; | |
1149 | char fmt6[2] = { fmt[0], '6' }; | |
1150 | u8 off = 0; | |
1151 | ||
1152 | fmt++; | |
1153 | while (isalpha(*++fmt)) { | |
1154 | switch (*fmt) { | |
1155 | case 'p': | |
1156 | have_p = true; | |
1157 | break; | |
1158 | case 'f': | |
1159 | have_f = true; | |
1160 | break; | |
1161 | case 's': | |
1162 | have_s = true; | |
1163 | break; | |
1164 | case 'c': | |
1165 | have_c = true; | |
1166 | break; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | if (have_p || have_s || have_f) { | |
1171 | *p = '['; | |
1172 | off = 1; | |
1173 | } | |
1174 | ||
1175 | if (fmt6[0] == 'I' && have_c) | |
1176 | p = ip6_compressed_string(ip6_addr + off, addr); | |
1177 | else | |
1178 | p = ip6_string(ip6_addr + off, addr, fmt6); | |
1179 | ||
1180 | if (have_p || have_s || have_f) | |
1181 | *p++ = ']'; | |
1182 | ||
1183 | if (have_p) { | |
1184 | *p++ = ':'; | |
1185 | p = number(p, pend, ntohs(sa->sin6_port), spec); | |
1186 | } | |
1187 | if (have_f) { | |
1188 | *p++ = '/'; | |
1189 | p = number(p, pend, ntohl(sa->sin6_flowinfo & | |
1190 | IPV6_FLOWINFO_MASK), spec); | |
1191 | } | |
1192 | if (have_s) { | |
1193 | *p++ = '%'; | |
1194 | p = number(p, pend, sa->sin6_scope_id, spec); | |
1195 | } | |
1196 | *p = '\0'; | |
1197 | ||
1198 | return string(buf, end, ip6_addr, spec); | |
1199 | } | |
1200 | ||
1201 | static noinline_for_stack | |
1202 | char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa, | |
1203 | struct printf_spec spec, const char *fmt) | |
1204 | { | |
1205 | bool have_p = false; | |
1206 | char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")]; | |
1207 | char *pend = ip4_addr + sizeof(ip4_addr); | |
1208 | const u8 *addr = (const u8 *) &sa->sin_addr.s_addr; | |
1209 | char fmt4[3] = { fmt[0], '4', 0 }; | |
1210 | ||
1211 | fmt++; | |
1212 | while (isalpha(*++fmt)) { | |
1213 | switch (*fmt) { | |
1214 | case 'p': | |
1215 | have_p = true; | |
1216 | break; | |
1217 | case 'h': | |
1218 | case 'l': | |
1219 | case 'n': | |
1220 | case 'b': | |
1221 | fmt4[2] = *fmt; | |
1222 | break; | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | p = ip4_string(ip4_addr, addr, fmt4); | |
1227 | if (have_p) { | |
1228 | *p++ = ':'; | |
1229 | p = number(p, pend, ntohs(sa->sin_port), spec); | |
1230 | } | |
1231 | *p = '\0'; | |
1232 | ||
1233 | return string(buf, end, ip4_addr, spec); | |
1234 | } | |
1235 | ||
71dca95d AS |
1236 | static noinline_for_stack |
1237 | char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec, | |
1238 | const char *fmt) | |
1239 | { | |
1240 | bool found = true; | |
1241 | int count = 1; | |
1242 | unsigned int flags = 0; | |
1243 | int len; | |
1244 | ||
1245 | if (spec.field_width == 0) | |
1246 | return buf; /* nothing to print */ | |
1247 | ||
1248 | if (ZERO_OR_NULL_PTR(addr)) | |
1249 | return string(buf, end, NULL, spec); /* NULL pointer */ | |
1250 | ||
1251 | ||
1252 | do { | |
1253 | switch (fmt[count++]) { | |
1254 | case 'a': | |
1255 | flags |= ESCAPE_ANY; | |
1256 | break; | |
1257 | case 'c': | |
1258 | flags |= ESCAPE_SPECIAL; | |
1259 | break; | |
1260 | case 'h': | |
1261 | flags |= ESCAPE_HEX; | |
1262 | break; | |
1263 | case 'n': | |
1264 | flags |= ESCAPE_NULL; | |
1265 | break; | |
1266 | case 'o': | |
1267 | flags |= ESCAPE_OCTAL; | |
1268 | break; | |
1269 | case 'p': | |
1270 | flags |= ESCAPE_NP; | |
1271 | break; | |
1272 | case 's': | |
1273 | flags |= ESCAPE_SPACE; | |
1274 | break; | |
1275 | default: | |
1276 | found = false; | |
1277 | break; | |
1278 | } | |
1279 | } while (found); | |
1280 | ||
1281 | if (!flags) | |
1282 | flags = ESCAPE_ANY_NP; | |
1283 | ||
1284 | len = spec.field_width < 0 ? 1 : spec.field_width; | |
1285 | ||
41416f23 RV |
1286 | /* |
1287 | * string_escape_mem() writes as many characters as it can to | |
1288 | * the given buffer, and returns the total size of the output | |
1289 | * had the buffer been big enough. | |
1290 | */ | |
1291 | buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL); | |
71dca95d AS |
1292 | |
1293 | return buf; | |
1294 | } | |
1295 | ||
cf3b429b JP |
1296 | static noinline_for_stack |
1297 | char *uuid_string(char *buf, char *end, const u8 *addr, | |
1298 | struct printf_spec spec, const char *fmt) | |
9ac6e44e JP |
1299 | { |
1300 | char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")]; | |
1301 | char *p = uuid; | |
1302 | int i; | |
1303 | static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; | |
1304 | static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15}; | |
1305 | const u8 *index = be; | |
1306 | bool uc = false; | |
1307 | ||
1308 | switch (*(++fmt)) { | |
1309 | case 'L': | |
1310 | uc = true; /* fall-through */ | |
1311 | case 'l': | |
1312 | index = le; | |
1313 | break; | |
1314 | case 'B': | |
1315 | uc = true; | |
1316 | break; | |
1317 | } | |
1318 | ||
1319 | for (i = 0; i < 16; i++) { | |
55036ba7 | 1320 | p = hex_byte_pack(p, addr[index[i]]); |
9ac6e44e JP |
1321 | switch (i) { |
1322 | case 3: | |
1323 | case 5: | |
1324 | case 7: | |
1325 | case 9: | |
1326 | *p++ = '-'; | |
1327 | break; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | *p = 0; | |
1332 | ||
1333 | if (uc) { | |
1334 | p = uuid; | |
1335 | do { | |
1336 | *p = toupper(*p); | |
1337 | } while (*(++p)); | |
1338 | } | |
1339 | ||
1340 | return string(buf, end, uuid, spec); | |
1341 | } | |
1342 | ||
c8f44aff MM |
1343 | static |
1344 | char *netdev_feature_string(char *buf, char *end, const u8 *addr, | |
1345 | struct printf_spec spec) | |
1346 | { | |
1347 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1348 | if (spec.field_width == -1) | |
1349 | spec.field_width = 2 + 2 * sizeof(netdev_features_t); | |
1350 | spec.base = 16; | |
1351 | ||
1352 | return number(buf, end, *(const netdev_features_t *)addr, spec); | |
1353 | } | |
1354 | ||
aaf07621 JP |
1355 | static noinline_for_stack |
1356 | char *address_val(char *buf, char *end, const void *addr, | |
1357 | struct printf_spec spec, const char *fmt) | |
1358 | { | |
1359 | unsigned long long num; | |
1360 | ||
1361 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1362 | spec.base = 16; | |
1363 | ||
1364 | switch (fmt[1]) { | |
1365 | case 'd': | |
1366 | num = *(const dma_addr_t *)addr; | |
1367 | spec.field_width = sizeof(dma_addr_t) * 2 + 2; | |
1368 | break; | |
1369 | case 'p': | |
1370 | default: | |
1371 | num = *(const phys_addr_t *)addr; | |
1372 | spec.field_width = sizeof(phys_addr_t) * 2 + 2; | |
1373 | break; | |
1374 | } | |
1375 | ||
1376 | return number(buf, end, num, spec); | |
1377 | } | |
1378 | ||
900cca29 GU |
1379 | static noinline_for_stack |
1380 | char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec, | |
1381 | const char *fmt) | |
1382 | { | |
1383 | if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk) | |
1384 | return string(buf, end, NULL, spec); | |
1385 | ||
1386 | switch (fmt[1]) { | |
1387 | case 'r': | |
1388 | return number(buf, end, clk_get_rate(clk), spec); | |
1389 | ||
1390 | case 'n': | |
1391 | default: | |
1392 | #ifdef CONFIG_COMMON_CLK | |
1393 | return string(buf, end, __clk_get_name(clk), spec); | |
1394 | #else | |
1395 | spec.base = 16; | |
1396 | spec.field_width = sizeof(unsigned long) * 2 + 2; | |
1397 | spec.flags |= SPECIAL | SMALL | ZEROPAD; | |
1398 | return number(buf, end, (unsigned long)clk, spec); | |
1399 | #endif | |
1400 | } | |
1401 | } | |
1402 | ||
411f05f1 | 1403 | int kptr_restrict __read_mostly; |
455cd5ab | 1404 | |
4d8a743c LT |
1405 | /* |
1406 | * Show a '%p' thing. A kernel extension is that the '%p' is followed | |
1407 | * by an extra set of alphanumeric characters that are extended format | |
1408 | * specifiers. | |
1409 | * | |
332d2e78 LT |
1410 | * Right now we handle: |
1411 | * | |
0c8b946e FW |
1412 | * - 'F' For symbolic function descriptor pointers with offset |
1413 | * - 'f' For simple symbolic function names without offset | |
0efb4d20 SR |
1414 | * - 'S' For symbolic direct pointers with offset |
1415 | * - 's' For symbolic direct pointers without offset | |
b0d33c2b | 1416 | * - '[FfSs]R' as above with __builtin_extract_return_addr() translation |
0f77a8d3 | 1417 | * - 'B' For backtraced symbolic direct pointers with offset |
c7dabef8 BH |
1418 | * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] |
1419 | * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] | |
dbc760bc TH |
1420 | * - 'b[l]' For a bitmap, the number of bits is determined by the field |
1421 | * width which must be explicitly specified either as part of the | |
1422 | * format string '%32b[l]' or through '%*b[l]', [l] selects | |
1423 | * range-list format instead of hex format | |
dd45c9cf HH |
1424 | * - 'M' For a 6-byte MAC address, it prints the address in the |
1425 | * usual colon-separated hex notation | |
8a27f7c9 | 1426 | * - 'm' For a 6-byte MAC address, it prints the hex address without colons |
bc7259a2 | 1427 | * - 'MF' For a 6-byte MAC FDDI address, it prints the address |
c8e00060 | 1428 | * with a dash-separated hex notation |
7c59154e | 1429 | * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth) |
8a27f7c9 JP |
1430 | * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way |
1431 | * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4) | |
1432 | * IPv6 uses colon separated network-order 16 bit hex with leading 0's | |
10679643 DB |
1433 | * [S][pfs] |
1434 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1435 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
8a27f7c9 JP |
1436 | * - 'i' [46] for 'raw' IPv4/IPv6 addresses |
1437 | * IPv6 omits the colons (01020304...0f) | |
1438 | * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006) | |
10679643 DB |
1439 | * [S][pfs] |
1440 | * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to | |
1441 | * [4] or [6] and is able to print port [p], flowinfo [f], scope [s] | |
1442 | * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order | |
1443 | * - 'I[6S]c' for IPv6 addresses printed as specified by | |
29cf519e | 1444 | * http://tools.ietf.org/html/rfc5952 |
71dca95d AS |
1445 | * - 'E[achnops]' For an escaped buffer, where rules are defined by combination |
1446 | * of the following flags (see string_escape_mem() for the | |
1447 | * details): | |
1448 | * a - ESCAPE_ANY | |
1449 | * c - ESCAPE_SPECIAL | |
1450 | * h - ESCAPE_HEX | |
1451 | * n - ESCAPE_NULL | |
1452 | * o - ESCAPE_OCTAL | |
1453 | * p - ESCAPE_NP | |
1454 | * s - ESCAPE_SPACE | |
1455 | * By default ESCAPE_ANY_NP is used. | |
9ac6e44e JP |
1456 | * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form |
1457 | * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" | |
1458 | * Options for %pU are: | |
1459 | * b big endian lower case hex (default) | |
1460 | * B big endian UPPER case hex | |
1461 | * l little endian lower case hex | |
1462 | * L little endian UPPER case hex | |
1463 | * big endian output byte order is: | |
1464 | * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15] | |
1465 | * little endian output byte order is: | |
1466 | * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15] | |
7db6f5fb JP |
1467 | * - 'V' For a struct va_format which contains a format string * and va_list *, |
1468 | * call vsnprintf(->format, *->va_list). | |
1469 | * Implements a "recursive vsnprintf". | |
1470 | * Do not use this feature without some mechanism to verify the | |
1471 | * correctness of the format string and va_list arguments. | |
455cd5ab | 1472 | * - 'K' For a kernel pointer that should be hidden from unprivileged users |
c8f44aff | 1473 | * - 'NF' For a netdev_features_t |
31550a16 AS |
1474 | * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with |
1475 | * a certain separator (' ' by default): | |
1476 | * C colon | |
1477 | * D dash | |
1478 | * N no separator | |
1479 | * The maximum supported length is 64 bytes of the input. Consider | |
1480 | * to use print_hex_dump() for the larger input. | |
aaf07621 JP |
1481 | * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives |
1482 | * (default assumed to be phys_addr_t, passed by reference) | |
c0d92a57 OJ |
1483 | * - 'd[234]' For a dentry name (optionally 2-4 last components) |
1484 | * - 'D[234]' Same as 'd' but for a struct file | |
1031bc58 | 1485 | * - 'g' For block_device name (gendisk + partition number) |
900cca29 GU |
1486 | * - 'C' For a clock, it prints the name (Common Clock Framework) or address |
1487 | * (legacy clock framework) of the clock | |
1488 | * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address | |
1489 | * (legacy clock framework) of the clock | |
1490 | * - 'Cr' For a clock, it prints the current rate of the clock | |
5e4ee7b1 MK |
1491 | * |
1492 | * ** Please update also Documentation/printk-formats.txt when making changes ** | |
9ac6e44e | 1493 | * |
332d2e78 LT |
1494 | * Note: The difference between 'S' and 'F' is that on ia64 and ppc64 |
1495 | * function pointers are really function descriptors, which contain a | |
1496 | * pointer to the real address. | |
4d8a743c | 1497 | */ |
cf3b429b JP |
1498 | static noinline_for_stack |
1499 | char *pointer(const char *fmt, char *buf, char *end, void *ptr, | |
1500 | struct printf_spec spec) | |
78a8bf69 | 1501 | { |
80c9eb46 | 1502 | const int default_width = 2 * sizeof(void *); |
725fe002 | 1503 | |
9f36e2c4 | 1504 | if (!ptr && *fmt != 'K') { |
5e057981 JP |
1505 | /* |
1506 | * Print (null) with the same width as a pointer so it makes | |
1507 | * tabular output look nice. | |
1508 | */ | |
1509 | if (spec.field_width == -1) | |
725fe002 | 1510 | spec.field_width = default_width; |
fef20d9c | 1511 | return string(buf, end, "(null)", spec); |
5e057981 | 1512 | } |
d97106ab | 1513 | |
0fe1ef24 LT |
1514 | switch (*fmt) { |
1515 | case 'F': | |
0c8b946e | 1516 | case 'f': |
0fe1ef24 LT |
1517 | ptr = dereference_function_descriptor(ptr); |
1518 | /* Fallthrough */ | |
1519 | case 'S': | |
9ac6e44e | 1520 | case 's': |
0f77a8d3 | 1521 | case 'B': |
b0d33c2b | 1522 | return symbol_string(buf, end, ptr, spec, fmt); |
332d2e78 | 1523 | case 'R': |
c7dabef8 | 1524 | case 'r': |
fd95541e | 1525 | return resource_string(buf, end, ptr, spec, fmt); |
31550a16 AS |
1526 | case 'h': |
1527 | return hex_string(buf, end, ptr, spec, fmt); | |
dbc760bc TH |
1528 | case 'b': |
1529 | switch (fmt[1]) { | |
1530 | case 'l': | |
1531 | return bitmap_list_string(buf, end, ptr, spec, fmt); | |
1532 | default: | |
1533 | return bitmap_string(buf, end, ptr, spec, fmt); | |
1534 | } | |
8a27f7c9 JP |
1535 | case 'M': /* Colon separated: 00:01:02:03:04:05 */ |
1536 | case 'm': /* Contiguous: 000102030405 */ | |
76597ff9 AE |
1537 | /* [mM]F (FDDI) */ |
1538 | /* [mM]R (Reverse order; Bluetooth) */ | |
8a27f7c9 JP |
1539 | return mac_address_string(buf, end, ptr, spec, fmt); |
1540 | case 'I': /* Formatted IP supported | |
1541 | * 4: 1.2.3.4 | |
1542 | * 6: 0001:0203:...:0708 | |
1543 | * 6c: 1::708 or 1::1.2.3.4 | |
1544 | */ | |
1545 | case 'i': /* Contiguous: | |
1546 | * 4: 001.002.003.004 | |
1547 | * 6: 000102...0f | |
1548 | */ | |
1549 | switch (fmt[1]) { | |
1550 | case '6': | |
1551 | return ip6_addr_string(buf, end, ptr, spec, fmt); | |
1552 | case '4': | |
1553 | return ip4_addr_string(buf, end, ptr, spec, fmt); | |
10679643 DB |
1554 | case 'S': { |
1555 | const union { | |
1556 | struct sockaddr raw; | |
1557 | struct sockaddr_in v4; | |
1558 | struct sockaddr_in6 v6; | |
1559 | } *sa = ptr; | |
1560 | ||
1561 | switch (sa->raw.sa_family) { | |
1562 | case AF_INET: | |
1563 | return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt); | |
1564 | case AF_INET6: | |
1565 | return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt); | |
1566 | default: | |
1567 | return string(buf, end, "(invalid address)", spec); | |
1568 | }} | |
8a27f7c9 | 1569 | } |
fef20d9c | 1570 | break; |
71dca95d AS |
1571 | case 'E': |
1572 | return escaped_string(buf, end, ptr, spec, fmt); | |
9ac6e44e JP |
1573 | case 'U': |
1574 | return uuid_string(buf, end, ptr, spec, fmt); | |
7db6f5fb | 1575 | case 'V': |
5756b76e JB |
1576 | { |
1577 | va_list va; | |
1578 | ||
1579 | va_copy(va, *((struct va_format *)ptr)->va); | |
1580 | buf += vsnprintf(buf, end > buf ? end - buf : 0, | |
1581 | ((struct va_format *)ptr)->fmt, va); | |
1582 | va_end(va); | |
1583 | return buf; | |
1584 | } | |
455cd5ab DR |
1585 | case 'K': |
1586 | /* | |
1587 | * %pK cannot be used in IRQ context because its test | |
1588 | * for CAP_SYSLOG would be meaningless. | |
1589 | */ | |
3715c530 DR |
1590 | if (kptr_restrict && (in_irq() || in_serving_softirq() || |
1591 | in_nmi())) { | |
455cd5ab | 1592 | if (spec.field_width == -1) |
725fe002 | 1593 | spec.field_width = default_width; |
455cd5ab | 1594 | return string(buf, end, "pK-error", spec); |
455cd5ab | 1595 | } |
312b4e22 RM |
1596 | |
1597 | switch (kptr_restrict) { | |
1598 | case 0: | |
1599 | /* Always print %pK values */ | |
1600 | break; | |
1601 | case 1: { | |
1602 | /* | |
1603 | * Only print the real pointer value if the current | |
1604 | * process has CAP_SYSLOG and is running with the | |
1605 | * same credentials it started with. This is because | |
1606 | * access to files is checked at open() time, but %pK | |
1607 | * checks permission at read() time. We don't want to | |
1608 | * leak pointer values if a binary opens a file using | |
1609 | * %pK and then elevates privileges before reading it. | |
1610 | */ | |
1611 | const struct cred *cred = current_cred(); | |
1612 | ||
1613 | if (!has_capability_noaudit(current, CAP_SYSLOG) || | |
1614 | !uid_eq(cred->euid, cred->uid) || | |
1615 | !gid_eq(cred->egid, cred->gid)) | |
1616 | ptr = NULL; | |
1617 | break; | |
1618 | } | |
1619 | case 2: | |
1620 | default: | |
1621 | /* Always print 0's for %pK */ | |
26297607 | 1622 | ptr = NULL; |
312b4e22 RM |
1623 | break; |
1624 | } | |
26297607 | 1625 | break; |
312b4e22 | 1626 | |
c8f44aff MM |
1627 | case 'N': |
1628 | switch (fmt[1]) { | |
1629 | case 'F': | |
1630 | return netdev_feature_string(buf, end, ptr, spec); | |
1631 | } | |
1632 | break; | |
7d799210 | 1633 | case 'a': |
aaf07621 | 1634 | return address_val(buf, end, ptr, spec, fmt); |
4b6ccca7 AV |
1635 | case 'd': |
1636 | return dentry_name(buf, end, ptr, spec, fmt); | |
900cca29 GU |
1637 | case 'C': |
1638 | return clock(buf, end, ptr, spec, fmt); | |
4b6ccca7 AV |
1639 | case 'D': |
1640 | return dentry_name(buf, end, | |
1641 | ((const struct file *)ptr)->f_path.dentry, | |
1642 | spec, fmt); | |
1031bc58 DM |
1643 | #ifdef CONFIG_BLOCK |
1644 | case 'g': | |
1645 | return bdev_name(buf, end, ptr, spec, fmt); | |
1646 | #endif | |
1647 | ||
fef20d9c FW |
1648 | } |
1649 | spec.flags |= SMALL; | |
1650 | if (spec.field_width == -1) { | |
725fe002 | 1651 | spec.field_width = default_width; |
fef20d9c FW |
1652 | spec.flags |= ZEROPAD; |
1653 | } | |
1654 | spec.base = 16; | |
1655 | ||
1656 | return number(buf, end, (unsigned long) ptr, spec); | |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * Helper function to decode printf style format. | |
1661 | * Each call decode a token from the format and return the | |
1662 | * number of characters read (or likely the delta where it wants | |
1663 | * to go on the next call). | |
1664 | * The decoded token is returned through the parameters | |
1665 | * | |
1666 | * 'h', 'l', or 'L' for integer fields | |
1667 | * 'z' support added 23/7/1999 S.H. | |
1668 | * 'z' changed to 'Z' --davidm 1/25/99 | |
1669 | * 't' added for ptrdiff_t | |
1670 | * | |
1671 | * @fmt: the format string | |
1672 | * @type of the token returned | |
1673 | * @flags: various flags such as +, -, # tokens.. | |
1674 | * @field_width: overwritten width | |
1675 | * @base: base of the number (octal, hex, ...) | |
1676 | * @precision: precision of a number | |
1677 | * @qualifier: qualifier of a number (long, size_t, ...) | |
1678 | */ | |
cf3b429b JP |
1679 | static noinline_for_stack |
1680 | int format_decode(const char *fmt, struct printf_spec *spec) | |
fef20d9c FW |
1681 | { |
1682 | const char *start = fmt; | |
fef20d9c FW |
1683 | |
1684 | /* we finished early by reading the field width */ | |
ed681a91 | 1685 | if (spec->type == FORMAT_TYPE_WIDTH) { |
fef20d9c FW |
1686 | if (spec->field_width < 0) { |
1687 | spec->field_width = -spec->field_width; | |
1688 | spec->flags |= LEFT; | |
1689 | } | |
1690 | spec->type = FORMAT_TYPE_NONE; | |
1691 | goto precision; | |
1692 | } | |
1693 | ||
1694 | /* we finished early by reading the precision */ | |
1695 | if (spec->type == FORMAT_TYPE_PRECISION) { | |
1696 | if (spec->precision < 0) | |
1697 | spec->precision = 0; | |
1698 | ||
1699 | spec->type = FORMAT_TYPE_NONE; | |
1700 | goto qualifier; | |
1701 | } | |
1702 | ||
1703 | /* By default */ | |
1704 | spec->type = FORMAT_TYPE_NONE; | |
1705 | ||
1706 | for (; *fmt ; ++fmt) { | |
1707 | if (*fmt == '%') | |
1708 | break; | |
1709 | } | |
1710 | ||
1711 | /* Return the current non-format string */ | |
1712 | if (fmt != start || !*fmt) | |
1713 | return fmt - start; | |
1714 | ||
1715 | /* Process flags */ | |
1716 | spec->flags = 0; | |
1717 | ||
1718 | while (1) { /* this also skips first '%' */ | |
1719 | bool found = true; | |
1720 | ||
1721 | ++fmt; | |
1722 | ||
1723 | switch (*fmt) { | |
1724 | case '-': spec->flags |= LEFT; break; | |
1725 | case '+': spec->flags |= PLUS; break; | |
1726 | case ' ': spec->flags |= SPACE; break; | |
1727 | case '#': spec->flags |= SPECIAL; break; | |
1728 | case '0': spec->flags |= ZEROPAD; break; | |
1729 | default: found = false; | |
1730 | } | |
1731 | ||
1732 | if (!found) | |
1733 | break; | |
1734 | } | |
1735 | ||
1736 | /* get field width */ | |
1737 | spec->field_width = -1; | |
1738 | ||
1739 | if (isdigit(*fmt)) | |
1740 | spec->field_width = skip_atoi(&fmt); | |
1741 | else if (*fmt == '*') { | |
1742 | /* it's the next argument */ | |
ed681a91 | 1743 | spec->type = FORMAT_TYPE_WIDTH; |
fef20d9c FW |
1744 | return ++fmt - start; |
1745 | } | |
1746 | ||
1747 | precision: | |
1748 | /* get the precision */ | |
1749 | spec->precision = -1; | |
1750 | if (*fmt == '.') { | |
1751 | ++fmt; | |
1752 | if (isdigit(*fmt)) { | |
1753 | spec->precision = skip_atoi(&fmt); | |
1754 | if (spec->precision < 0) | |
1755 | spec->precision = 0; | |
1756 | } else if (*fmt == '*') { | |
1757 | /* it's the next argument */ | |
adf26f84 | 1758 | spec->type = FORMAT_TYPE_PRECISION; |
fef20d9c FW |
1759 | return ++fmt - start; |
1760 | } | |
1761 | } | |
1762 | ||
1763 | qualifier: | |
1764 | /* get the conversion qualifier */ | |
1765 | spec->qualifier = -1; | |
75fb8f26 AS |
1766 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
1767 | _tolower(*fmt) == 'z' || *fmt == 't') { | |
a4e94ef0 Z |
1768 | spec->qualifier = *fmt++; |
1769 | if (unlikely(spec->qualifier == *fmt)) { | |
1770 | if (spec->qualifier == 'l') { | |
1771 | spec->qualifier = 'L'; | |
1772 | ++fmt; | |
1773 | } else if (spec->qualifier == 'h') { | |
1774 | spec->qualifier = 'H'; | |
1775 | ++fmt; | |
1776 | } | |
fef20d9c FW |
1777 | } |
1778 | } | |
1779 | ||
1780 | /* default base */ | |
1781 | spec->base = 10; | |
1782 | switch (*fmt) { | |
1783 | case 'c': | |
1784 | spec->type = FORMAT_TYPE_CHAR; | |
1785 | return ++fmt - start; | |
1786 | ||
1787 | case 's': | |
1788 | spec->type = FORMAT_TYPE_STR; | |
1789 | return ++fmt - start; | |
1790 | ||
1791 | case 'p': | |
1792 | spec->type = FORMAT_TYPE_PTR; | |
ffbfed03 | 1793 | return ++fmt - start; |
fef20d9c | 1794 | |
fef20d9c FW |
1795 | case '%': |
1796 | spec->type = FORMAT_TYPE_PERCENT_CHAR; | |
1797 | return ++fmt - start; | |
1798 | ||
1799 | /* integer number formats - set up the flags and "break" */ | |
1800 | case 'o': | |
1801 | spec->base = 8; | |
1802 | break; | |
1803 | ||
1804 | case 'x': | |
1805 | spec->flags |= SMALL; | |
1806 | ||
1807 | case 'X': | |
1808 | spec->base = 16; | |
1809 | break; | |
1810 | ||
1811 | case 'd': | |
1812 | case 'i': | |
39e874f8 | 1813 | spec->flags |= SIGN; |
fef20d9c | 1814 | case 'u': |
4aa99606 | 1815 | break; |
fef20d9c | 1816 | |
708d96fd RM |
1817 | case 'n': |
1818 | /* | |
b006f19b RV |
1819 | * Since %n poses a greater security risk than |
1820 | * utility, treat it as any other invalid or | |
1821 | * unsupported format specifier. | |
708d96fd | 1822 | */ |
708d96fd RM |
1823 | /* Fall-through */ |
1824 | ||
fef20d9c | 1825 | default: |
b006f19b | 1826 | WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt); |
fef20d9c FW |
1827 | spec->type = FORMAT_TYPE_INVALID; |
1828 | return fmt - start; | |
0fe1ef24 | 1829 | } |
fef20d9c FW |
1830 | |
1831 | if (spec->qualifier == 'L') | |
1832 | spec->type = FORMAT_TYPE_LONG_LONG; | |
1833 | else if (spec->qualifier == 'l') { | |
51be17df RV |
1834 | BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG); |
1835 | spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN); | |
75fb8f26 | 1836 | } else if (_tolower(spec->qualifier) == 'z') { |
fef20d9c FW |
1837 | spec->type = FORMAT_TYPE_SIZE_T; |
1838 | } else if (spec->qualifier == 't') { | |
1839 | spec->type = FORMAT_TYPE_PTRDIFF; | |
a4e94ef0 | 1840 | } else if (spec->qualifier == 'H') { |
51be17df RV |
1841 | BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE); |
1842 | spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN); | |
fef20d9c | 1843 | } else if (spec->qualifier == 'h') { |
51be17df RV |
1844 | BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT); |
1845 | spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN); | |
fef20d9c | 1846 | } else { |
51be17df RV |
1847 | BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT); |
1848 | spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN); | |
78a8bf69 | 1849 | } |
fef20d9c FW |
1850 | |
1851 | return ++fmt - start; | |
78a8bf69 LT |
1852 | } |
1853 | ||
1da177e4 LT |
1854 | /** |
1855 | * vsnprintf - Format a string and place it in a buffer | |
1856 | * @buf: The buffer to place the result into | |
1857 | * @size: The size of the buffer, including the trailing null space | |
1858 | * @fmt: The format string to use | |
1859 | * @args: Arguments for the format string | |
1860 | * | |
d7ec9a05 RV |
1861 | * This function generally follows C99 vsnprintf, but has some |
1862 | * extensions and a few limitations: | |
1863 | * | |
1864 | * %n is unsupported | |
5e4ee7b1 MK |
1865 | * %p* is handled by pointer() |
1866 | * | |
1867 | * See pointer() or Documentation/printk-formats.txt for more | |
1868 | * extensive description. | |
20036fdc | 1869 | * |
5e4ee7b1 | 1870 | * ** Please update the documentation in both places when making changes ** |
80f548e0 | 1871 | * |
1da177e4 LT |
1872 | * The return value is the number of characters which would |
1873 | * be generated for the given input, excluding the trailing | |
1874 | * '\0', as per ISO C99. If you want to have the exact | |
1875 | * number of characters written into @buf as return value | |
72fd4a35 | 1876 | * (not including the trailing '\0'), use vscnprintf(). If the |
1da177e4 LT |
1877 | * return is greater than or equal to @size, the resulting |
1878 | * string is truncated. | |
1879 | * | |
ba1835eb | 1880 | * If you're not already dealing with a va_list consider using snprintf(). |
1da177e4 LT |
1881 | */ |
1882 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
1883 | { | |
1da177e4 | 1884 | unsigned long long num; |
d4be151b | 1885 | char *str, *end; |
fef20d9c | 1886 | struct printf_spec spec = {0}; |
1da177e4 | 1887 | |
f796937a JF |
1888 | /* Reject out-of-range values early. Large positive sizes are |
1889 | used for unknown buffer sizes. */ | |
2aa2f9e2 | 1890 | if (WARN_ON_ONCE(size > INT_MAX)) |
1da177e4 | 1891 | return 0; |
1da177e4 LT |
1892 | |
1893 | str = buf; | |
f796937a | 1894 | end = buf + size; |
1da177e4 | 1895 | |
f796937a JF |
1896 | /* Make sure end is always >= buf */ |
1897 | if (end < buf) { | |
1898 | end = ((void *)-1); | |
1899 | size = end - buf; | |
1da177e4 LT |
1900 | } |
1901 | ||
fef20d9c FW |
1902 | while (*fmt) { |
1903 | const char *old_fmt = fmt; | |
d4be151b | 1904 | int read = format_decode(fmt, &spec); |
1da177e4 | 1905 | |
fef20d9c | 1906 | fmt += read; |
1da177e4 | 1907 | |
fef20d9c FW |
1908 | switch (spec.type) { |
1909 | case FORMAT_TYPE_NONE: { | |
1910 | int copy = read; | |
1911 | if (str < end) { | |
1912 | if (copy > end - str) | |
1913 | copy = end - str; | |
1914 | memcpy(str, old_fmt, copy); | |
1da177e4 | 1915 | } |
fef20d9c FW |
1916 | str += read; |
1917 | break; | |
1da177e4 LT |
1918 | } |
1919 | ||
ed681a91 | 1920 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
1921 | spec.field_width = va_arg(args, int); |
1922 | break; | |
1da177e4 | 1923 | |
fef20d9c FW |
1924 | case FORMAT_TYPE_PRECISION: |
1925 | spec.precision = va_arg(args, int); | |
1926 | break; | |
1da177e4 | 1927 | |
d4be151b AGR |
1928 | case FORMAT_TYPE_CHAR: { |
1929 | char c; | |
1930 | ||
fef20d9c FW |
1931 | if (!(spec.flags & LEFT)) { |
1932 | while (--spec.field_width > 0) { | |
f796937a | 1933 | if (str < end) |
1da177e4 LT |
1934 | *str = ' '; |
1935 | ++str; | |
1da177e4 | 1936 | |
fef20d9c FW |
1937 | } |
1938 | } | |
1939 | c = (unsigned char) va_arg(args, int); | |
1940 | if (str < end) | |
1941 | *str = c; | |
1942 | ++str; | |
1943 | while (--spec.field_width > 0) { | |
f796937a | 1944 | if (str < end) |
fef20d9c | 1945 | *str = ' '; |
1da177e4 | 1946 | ++str; |
fef20d9c FW |
1947 | } |
1948 | break; | |
d4be151b | 1949 | } |
1da177e4 | 1950 | |
fef20d9c FW |
1951 | case FORMAT_TYPE_STR: |
1952 | str = string(str, end, va_arg(args, char *), spec); | |
1953 | break; | |
1da177e4 | 1954 | |
fef20d9c | 1955 | case FORMAT_TYPE_PTR: |
ffbfed03 | 1956 | str = pointer(fmt, str, end, va_arg(args, void *), |
fef20d9c FW |
1957 | spec); |
1958 | while (isalnum(*fmt)) | |
1959 | fmt++; | |
1960 | break; | |
1da177e4 | 1961 | |
fef20d9c FW |
1962 | case FORMAT_TYPE_PERCENT_CHAR: |
1963 | if (str < end) | |
1964 | *str = '%'; | |
1965 | ++str; | |
1966 | break; | |
1da177e4 | 1967 | |
fef20d9c | 1968 | case FORMAT_TYPE_INVALID: |
b006f19b RV |
1969 | /* |
1970 | * Presumably the arguments passed gcc's type | |
1971 | * checking, but there is no safe or sane way | |
1972 | * for us to continue parsing the format and | |
1973 | * fetching from the va_list; the remaining | |
1974 | * specifiers and arguments would be out of | |
1975 | * sync. | |
1976 | */ | |
1977 | goto out; | |
fef20d9c | 1978 | |
fef20d9c FW |
1979 | default: |
1980 | switch (spec.type) { | |
1981 | case FORMAT_TYPE_LONG_LONG: | |
1982 | num = va_arg(args, long long); | |
1983 | break; | |
1984 | case FORMAT_TYPE_ULONG: | |
1985 | num = va_arg(args, unsigned long); | |
1986 | break; | |
1987 | case FORMAT_TYPE_LONG: | |
1988 | num = va_arg(args, long); | |
1989 | break; | |
1990 | case FORMAT_TYPE_SIZE_T: | |
ef124960 JG |
1991 | if (spec.flags & SIGN) |
1992 | num = va_arg(args, ssize_t); | |
1993 | else | |
1994 | num = va_arg(args, size_t); | |
fef20d9c FW |
1995 | break; |
1996 | case FORMAT_TYPE_PTRDIFF: | |
1997 | num = va_arg(args, ptrdiff_t); | |
1998 | break; | |
a4e94ef0 Z |
1999 | case FORMAT_TYPE_UBYTE: |
2000 | num = (unsigned char) va_arg(args, int); | |
2001 | break; | |
2002 | case FORMAT_TYPE_BYTE: | |
2003 | num = (signed char) va_arg(args, int); | |
2004 | break; | |
fef20d9c FW |
2005 | case FORMAT_TYPE_USHORT: |
2006 | num = (unsigned short) va_arg(args, int); | |
2007 | break; | |
2008 | case FORMAT_TYPE_SHORT: | |
2009 | num = (short) va_arg(args, int); | |
2010 | break; | |
39e874f8 FW |
2011 | case FORMAT_TYPE_INT: |
2012 | num = (int) va_arg(args, int); | |
fef20d9c FW |
2013 | break; |
2014 | default: | |
2015 | num = va_arg(args, unsigned int); | |
2016 | } | |
2017 | ||
2018 | str = number(str, end, num, spec); | |
1da177e4 | 2019 | } |
1da177e4 | 2020 | } |
fef20d9c | 2021 | |
b006f19b | 2022 | out: |
f796937a JF |
2023 | if (size > 0) { |
2024 | if (str < end) | |
2025 | *str = '\0'; | |
2026 | else | |
0a6047ee | 2027 | end[-1] = '\0'; |
f796937a | 2028 | } |
fef20d9c | 2029 | |
f796937a | 2030 | /* the trailing null byte doesn't count towards the total */ |
1da177e4 | 2031 | return str-buf; |
fef20d9c | 2032 | |
1da177e4 | 2033 | } |
1da177e4 LT |
2034 | EXPORT_SYMBOL(vsnprintf); |
2035 | ||
2036 | /** | |
2037 | * vscnprintf - Format a string and place it in a buffer | |
2038 | * @buf: The buffer to place the result into | |
2039 | * @size: The size of the buffer, including the trailing null space | |
2040 | * @fmt: The format string to use | |
2041 | * @args: Arguments for the format string | |
2042 | * | |
2043 | * The return value is the number of characters which have been written into | |
b921c69f | 2044 | * the @buf not including the trailing '\0'. If @size is == 0 the function |
1da177e4 LT |
2045 | * returns 0. |
2046 | * | |
ba1835eb | 2047 | * If you're not already dealing with a va_list consider using scnprintf(). |
20036fdc AK |
2048 | * |
2049 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2050 | */ |
2051 | int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
2052 | { | |
2053 | int i; | |
2054 | ||
7b9186f5 AGR |
2055 | i = vsnprintf(buf, size, fmt, args); |
2056 | ||
b921c69f AA |
2057 | if (likely(i < size)) |
2058 | return i; | |
2059 | if (size != 0) | |
2060 | return size - 1; | |
2061 | return 0; | |
1da177e4 | 2062 | } |
1da177e4 LT |
2063 | EXPORT_SYMBOL(vscnprintf); |
2064 | ||
2065 | /** | |
2066 | * snprintf - Format a string and place it in a buffer | |
2067 | * @buf: The buffer to place the result into | |
2068 | * @size: The size of the buffer, including the trailing null space | |
2069 | * @fmt: The format string to use | |
2070 | * @...: Arguments for the format string | |
2071 | * | |
2072 | * The return value is the number of characters which would be | |
2073 | * generated for the given input, excluding the trailing null, | |
2074 | * as per ISO C99. If the return is greater than or equal to | |
2075 | * @size, the resulting string is truncated. | |
20036fdc AK |
2076 | * |
2077 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2078 | */ |
7b9186f5 | 2079 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2080 | { |
2081 | va_list args; | |
2082 | int i; | |
2083 | ||
2084 | va_start(args, fmt); | |
7b9186f5 | 2085 | i = vsnprintf(buf, size, fmt, args); |
1da177e4 | 2086 | va_end(args); |
7b9186f5 | 2087 | |
1da177e4 LT |
2088 | return i; |
2089 | } | |
1da177e4 LT |
2090 | EXPORT_SYMBOL(snprintf); |
2091 | ||
2092 | /** | |
2093 | * scnprintf - Format a string and place it in a buffer | |
2094 | * @buf: The buffer to place the result into | |
2095 | * @size: The size of the buffer, including the trailing null space | |
2096 | * @fmt: The format string to use | |
2097 | * @...: Arguments for the format string | |
2098 | * | |
2099 | * The return value is the number of characters written into @buf not including | |
b903c0b8 | 2100 | * the trailing '\0'. If @size is == 0 the function returns 0. |
1da177e4 LT |
2101 | */ |
2102 | ||
7b9186f5 | 2103 | int scnprintf(char *buf, size_t size, const char *fmt, ...) |
1da177e4 LT |
2104 | { |
2105 | va_list args; | |
2106 | int i; | |
2107 | ||
2108 | va_start(args, fmt); | |
b921c69f | 2109 | i = vscnprintf(buf, size, fmt, args); |
1da177e4 | 2110 | va_end(args); |
7b9186f5 | 2111 | |
b921c69f | 2112 | return i; |
1da177e4 LT |
2113 | } |
2114 | EXPORT_SYMBOL(scnprintf); | |
2115 | ||
2116 | /** | |
2117 | * vsprintf - Format a string and place it in a buffer | |
2118 | * @buf: The buffer to place the result into | |
2119 | * @fmt: The format string to use | |
2120 | * @args: Arguments for the format string | |
2121 | * | |
2122 | * The function returns the number of characters written | |
72fd4a35 | 2123 | * into @buf. Use vsnprintf() or vscnprintf() in order to avoid |
1da177e4 LT |
2124 | * buffer overflows. |
2125 | * | |
ba1835eb | 2126 | * If you're not already dealing with a va_list consider using sprintf(). |
20036fdc AK |
2127 | * |
2128 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 LT |
2129 | */ |
2130 | int vsprintf(char *buf, const char *fmt, va_list args) | |
2131 | { | |
2132 | return vsnprintf(buf, INT_MAX, fmt, args); | |
2133 | } | |
1da177e4 LT |
2134 | EXPORT_SYMBOL(vsprintf); |
2135 | ||
2136 | /** | |
2137 | * sprintf - Format a string and place it in a buffer | |
2138 | * @buf: The buffer to place the result into | |
2139 | * @fmt: The format string to use | |
2140 | * @...: Arguments for the format string | |
2141 | * | |
2142 | * The function returns the number of characters written | |
72fd4a35 | 2143 | * into @buf. Use snprintf() or scnprintf() in order to avoid |
1da177e4 | 2144 | * buffer overflows. |
20036fdc AK |
2145 | * |
2146 | * See the vsnprintf() documentation for format string extensions over C99. | |
1da177e4 | 2147 | */ |
7b9186f5 | 2148 | int sprintf(char *buf, const char *fmt, ...) |
1da177e4 LT |
2149 | { |
2150 | va_list args; | |
2151 | int i; | |
2152 | ||
2153 | va_start(args, fmt); | |
7b9186f5 | 2154 | i = vsnprintf(buf, INT_MAX, fmt, args); |
1da177e4 | 2155 | va_end(args); |
7b9186f5 | 2156 | |
1da177e4 LT |
2157 | return i; |
2158 | } | |
1da177e4 LT |
2159 | EXPORT_SYMBOL(sprintf); |
2160 | ||
4370aa4a LJ |
2161 | #ifdef CONFIG_BINARY_PRINTF |
2162 | /* | |
2163 | * bprintf service: | |
2164 | * vbin_printf() - VA arguments to binary data | |
2165 | * bstr_printf() - Binary data to text string | |
2166 | */ | |
2167 | ||
2168 | /** | |
2169 | * vbin_printf - Parse a format string and place args' binary value in a buffer | |
2170 | * @bin_buf: The buffer to place args' binary value | |
2171 | * @size: The size of the buffer(by words(32bits), not characters) | |
2172 | * @fmt: The format string to use | |
2173 | * @args: Arguments for the format string | |
2174 | * | |
2175 | * The format follows C99 vsnprintf, except %n is ignored, and its argument | |
da3dae54 | 2176 | * is skipped. |
4370aa4a LJ |
2177 | * |
2178 | * The return value is the number of words(32bits) which would be generated for | |
2179 | * the given input. | |
2180 | * | |
2181 | * NOTE: | |
2182 | * If the return value is greater than @size, the resulting bin_buf is NOT | |
2183 | * valid for bstr_printf(). | |
2184 | */ | |
2185 | int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args) | |
2186 | { | |
fef20d9c | 2187 | struct printf_spec spec = {0}; |
4370aa4a | 2188 | char *str, *end; |
4370aa4a LJ |
2189 | |
2190 | str = (char *)bin_buf; | |
2191 | end = (char *)(bin_buf + size); | |
2192 | ||
2193 | #define save_arg(type) \ | |
2194 | do { \ | |
2195 | if (sizeof(type) == 8) { \ | |
2196 | unsigned long long value; \ | |
2197 | str = PTR_ALIGN(str, sizeof(u32)); \ | |
2198 | value = va_arg(args, unsigned long long); \ | |
2199 | if (str + sizeof(type) <= end) { \ | |
2200 | *(u32 *)str = *(u32 *)&value; \ | |
2201 | *(u32 *)(str + 4) = *((u32 *)&value + 1); \ | |
2202 | } \ | |
2203 | } else { \ | |
2204 | unsigned long value; \ | |
2205 | str = PTR_ALIGN(str, sizeof(type)); \ | |
2206 | value = va_arg(args, int); \ | |
2207 | if (str + sizeof(type) <= end) \ | |
2208 | *(typeof(type) *)str = (type)value; \ | |
2209 | } \ | |
2210 | str += sizeof(type); \ | |
2211 | } while (0) | |
2212 | ||
fef20d9c | 2213 | while (*fmt) { |
d4be151b | 2214 | int read = format_decode(fmt, &spec); |
4370aa4a | 2215 | |
fef20d9c | 2216 | fmt += read; |
4370aa4a | 2217 | |
fef20d9c FW |
2218 | switch (spec.type) { |
2219 | case FORMAT_TYPE_NONE: | |
d4be151b | 2220 | case FORMAT_TYPE_PERCENT_CHAR: |
fef20d9c | 2221 | break; |
b006f19b RV |
2222 | case FORMAT_TYPE_INVALID: |
2223 | goto out; | |
fef20d9c | 2224 | |
ed681a91 | 2225 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2226 | case FORMAT_TYPE_PRECISION: |
2227 | save_arg(int); | |
2228 | break; | |
2229 | ||
2230 | case FORMAT_TYPE_CHAR: | |
4370aa4a | 2231 | save_arg(char); |
fef20d9c FW |
2232 | break; |
2233 | ||
2234 | case FORMAT_TYPE_STR: { | |
4370aa4a LJ |
2235 | const char *save_str = va_arg(args, char *); |
2236 | size_t len; | |
6c356634 | 2237 | |
4370aa4a LJ |
2238 | if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE |
2239 | || (unsigned long)save_str < PAGE_SIZE) | |
0f4f81dc | 2240 | save_str = "(null)"; |
6c356634 AGR |
2241 | len = strlen(save_str) + 1; |
2242 | if (str + len < end) | |
2243 | memcpy(str, save_str, len); | |
2244 | str += len; | |
fef20d9c | 2245 | break; |
4370aa4a | 2246 | } |
fef20d9c FW |
2247 | |
2248 | case FORMAT_TYPE_PTR: | |
4370aa4a LJ |
2249 | save_arg(void *); |
2250 | /* skip all alphanumeric pointer suffixes */ | |
fef20d9c | 2251 | while (isalnum(*fmt)) |
4370aa4a | 2252 | fmt++; |
fef20d9c FW |
2253 | break; |
2254 | ||
fef20d9c FW |
2255 | default: |
2256 | switch (spec.type) { | |
2257 | ||
2258 | case FORMAT_TYPE_LONG_LONG: | |
4370aa4a | 2259 | save_arg(long long); |
fef20d9c FW |
2260 | break; |
2261 | case FORMAT_TYPE_ULONG: | |
2262 | case FORMAT_TYPE_LONG: | |
4370aa4a | 2263 | save_arg(unsigned long); |
fef20d9c FW |
2264 | break; |
2265 | case FORMAT_TYPE_SIZE_T: | |
4370aa4a | 2266 | save_arg(size_t); |
fef20d9c FW |
2267 | break; |
2268 | case FORMAT_TYPE_PTRDIFF: | |
4370aa4a | 2269 | save_arg(ptrdiff_t); |
fef20d9c | 2270 | break; |
a4e94ef0 Z |
2271 | case FORMAT_TYPE_UBYTE: |
2272 | case FORMAT_TYPE_BYTE: | |
2273 | save_arg(char); | |
2274 | break; | |
fef20d9c FW |
2275 | case FORMAT_TYPE_USHORT: |
2276 | case FORMAT_TYPE_SHORT: | |
4370aa4a | 2277 | save_arg(short); |
fef20d9c FW |
2278 | break; |
2279 | default: | |
4370aa4a | 2280 | save_arg(int); |
fef20d9c | 2281 | } |
4370aa4a LJ |
2282 | } |
2283 | } | |
fef20d9c | 2284 | |
b006f19b | 2285 | out: |
7b9186f5 | 2286 | return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf; |
fef20d9c | 2287 | #undef save_arg |
4370aa4a LJ |
2288 | } |
2289 | EXPORT_SYMBOL_GPL(vbin_printf); | |
2290 | ||
2291 | /** | |
2292 | * bstr_printf - Format a string from binary arguments and place it in a buffer | |
2293 | * @buf: The buffer to place the result into | |
2294 | * @size: The size of the buffer, including the trailing null space | |
2295 | * @fmt: The format string to use | |
2296 | * @bin_buf: Binary arguments for the format string | |
2297 | * | |
2298 | * This function like C99 vsnprintf, but the difference is that vsnprintf gets | |
2299 | * arguments from stack, and bstr_printf gets arguments from @bin_buf which is | |
2300 | * a binary buffer that generated by vbin_printf. | |
2301 | * | |
2302 | * The format follows C99 vsnprintf, but has some extensions: | |
0efb4d20 | 2303 | * see vsnprintf comment for details. |
4370aa4a LJ |
2304 | * |
2305 | * The return value is the number of characters which would | |
2306 | * be generated for the given input, excluding the trailing | |
2307 | * '\0', as per ISO C99. If you want to have the exact | |
2308 | * number of characters written into @buf as return value | |
2309 | * (not including the trailing '\0'), use vscnprintf(). If the | |
2310 | * return is greater than or equal to @size, the resulting | |
2311 | * string is truncated. | |
2312 | */ | |
2313 | int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf) | |
2314 | { | |
fef20d9c | 2315 | struct printf_spec spec = {0}; |
d4be151b AGR |
2316 | char *str, *end; |
2317 | const char *args = (const char *)bin_buf; | |
4370aa4a | 2318 | |
762abb51 | 2319 | if (WARN_ON_ONCE(size > INT_MAX)) |
4370aa4a | 2320 | return 0; |
4370aa4a LJ |
2321 | |
2322 | str = buf; | |
2323 | end = buf + size; | |
2324 | ||
2325 | #define get_arg(type) \ | |
2326 | ({ \ | |
2327 | typeof(type) value; \ | |
2328 | if (sizeof(type) == 8) { \ | |
2329 | args = PTR_ALIGN(args, sizeof(u32)); \ | |
2330 | *(u32 *)&value = *(u32 *)args; \ | |
2331 | *((u32 *)&value + 1) = *(u32 *)(args + 4); \ | |
2332 | } else { \ | |
2333 | args = PTR_ALIGN(args, sizeof(type)); \ | |
2334 | value = *(typeof(type) *)args; \ | |
2335 | } \ | |
2336 | args += sizeof(type); \ | |
2337 | value; \ | |
2338 | }) | |
2339 | ||
2340 | /* Make sure end is always >= buf */ | |
2341 | if (end < buf) { | |
2342 | end = ((void *)-1); | |
2343 | size = end - buf; | |
2344 | } | |
2345 | ||
fef20d9c | 2346 | while (*fmt) { |
fef20d9c | 2347 | const char *old_fmt = fmt; |
d4be151b | 2348 | int read = format_decode(fmt, &spec); |
4370aa4a | 2349 | |
fef20d9c | 2350 | fmt += read; |
4370aa4a | 2351 | |
fef20d9c FW |
2352 | switch (spec.type) { |
2353 | case FORMAT_TYPE_NONE: { | |
2354 | int copy = read; | |
2355 | if (str < end) { | |
2356 | if (copy > end - str) | |
2357 | copy = end - str; | |
2358 | memcpy(str, old_fmt, copy); | |
4370aa4a | 2359 | } |
fef20d9c FW |
2360 | str += read; |
2361 | break; | |
4370aa4a LJ |
2362 | } |
2363 | ||
ed681a91 | 2364 | case FORMAT_TYPE_WIDTH: |
fef20d9c FW |
2365 | spec.field_width = get_arg(int); |
2366 | break; | |
4370aa4a | 2367 | |
fef20d9c FW |
2368 | case FORMAT_TYPE_PRECISION: |
2369 | spec.precision = get_arg(int); | |
2370 | break; | |
4370aa4a | 2371 | |
d4be151b AGR |
2372 | case FORMAT_TYPE_CHAR: { |
2373 | char c; | |
2374 | ||
fef20d9c FW |
2375 | if (!(spec.flags & LEFT)) { |
2376 | while (--spec.field_width > 0) { | |
4370aa4a LJ |
2377 | if (str < end) |
2378 | *str = ' '; | |
2379 | ++str; | |
2380 | } | |
2381 | } | |
2382 | c = (unsigned char) get_arg(char); | |
2383 | if (str < end) | |
2384 | *str = c; | |
2385 | ++str; | |
fef20d9c | 2386 | while (--spec.field_width > 0) { |
4370aa4a LJ |
2387 | if (str < end) |
2388 | *str = ' '; | |
2389 | ++str; | |
2390 | } | |
fef20d9c | 2391 | break; |
d4be151b | 2392 | } |
4370aa4a | 2393 | |
fef20d9c | 2394 | case FORMAT_TYPE_STR: { |
4370aa4a | 2395 | const char *str_arg = args; |
d4be151b | 2396 | args += strlen(str_arg) + 1; |
fef20d9c FW |
2397 | str = string(str, end, (char *)str_arg, spec); |
2398 | break; | |
4370aa4a LJ |
2399 | } |
2400 | ||
fef20d9c | 2401 | case FORMAT_TYPE_PTR: |
ffbfed03 | 2402 | str = pointer(fmt, str, end, get_arg(void *), spec); |
fef20d9c | 2403 | while (isalnum(*fmt)) |
4370aa4a | 2404 | fmt++; |
fef20d9c | 2405 | break; |
4370aa4a | 2406 | |
fef20d9c | 2407 | case FORMAT_TYPE_PERCENT_CHAR: |
4370aa4a LJ |
2408 | if (str < end) |
2409 | *str = '%'; | |
2410 | ++str; | |
fef20d9c FW |
2411 | break; |
2412 | ||
b006f19b RV |
2413 | case FORMAT_TYPE_INVALID: |
2414 | goto out; | |
2415 | ||
d4be151b AGR |
2416 | default: { |
2417 | unsigned long long num; | |
2418 | ||
fef20d9c FW |
2419 | switch (spec.type) { |
2420 | ||
2421 | case FORMAT_TYPE_LONG_LONG: | |
2422 | num = get_arg(long long); | |
2423 | break; | |
2424 | case FORMAT_TYPE_ULONG: | |
fef20d9c FW |
2425 | case FORMAT_TYPE_LONG: |
2426 | num = get_arg(unsigned long); | |
2427 | break; | |
2428 | case FORMAT_TYPE_SIZE_T: | |
2429 | num = get_arg(size_t); | |
2430 | break; | |
2431 | case FORMAT_TYPE_PTRDIFF: | |
2432 | num = get_arg(ptrdiff_t); | |
2433 | break; | |
a4e94ef0 Z |
2434 | case FORMAT_TYPE_UBYTE: |
2435 | num = get_arg(unsigned char); | |
2436 | break; | |
2437 | case FORMAT_TYPE_BYTE: | |
2438 | num = get_arg(signed char); | |
2439 | break; | |
fef20d9c FW |
2440 | case FORMAT_TYPE_USHORT: |
2441 | num = get_arg(unsigned short); | |
2442 | break; | |
2443 | case FORMAT_TYPE_SHORT: | |
2444 | num = get_arg(short); | |
2445 | break; | |
2446 | case FORMAT_TYPE_UINT: | |
2447 | num = get_arg(unsigned int); | |
2448 | break; | |
2449 | default: | |
2450 | num = get_arg(int); | |
2451 | } | |
2452 | ||
2453 | str = number(str, end, num, spec); | |
d4be151b AGR |
2454 | } /* default: */ |
2455 | } /* switch(spec.type) */ | |
2456 | } /* while(*fmt) */ | |
fef20d9c | 2457 | |
b006f19b | 2458 | out: |
4370aa4a LJ |
2459 | if (size > 0) { |
2460 | if (str < end) | |
2461 | *str = '\0'; | |
2462 | else | |
2463 | end[-1] = '\0'; | |
2464 | } | |
fef20d9c | 2465 | |
4370aa4a LJ |
2466 | #undef get_arg |
2467 | ||
2468 | /* the trailing null byte doesn't count towards the total */ | |
2469 | return str - buf; | |
2470 | } | |
2471 | EXPORT_SYMBOL_GPL(bstr_printf); | |
2472 | ||
2473 | /** | |
2474 | * bprintf - Parse a format string and place args' binary value in a buffer | |
2475 | * @bin_buf: The buffer to place args' binary value | |
2476 | * @size: The size of the buffer(by words(32bits), not characters) | |
2477 | * @fmt: The format string to use | |
2478 | * @...: Arguments for the format string | |
2479 | * | |
2480 | * The function returns the number of words(u32) written | |
2481 | * into @bin_buf. | |
2482 | */ | |
2483 | int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) | |
2484 | { | |
2485 | va_list args; | |
2486 | int ret; | |
2487 | ||
2488 | va_start(args, fmt); | |
2489 | ret = vbin_printf(bin_buf, size, fmt, args); | |
2490 | va_end(args); | |
7b9186f5 | 2491 | |
4370aa4a LJ |
2492 | return ret; |
2493 | } | |
2494 | EXPORT_SYMBOL_GPL(bprintf); | |
2495 | ||
2496 | #endif /* CONFIG_BINARY_PRINTF */ | |
2497 | ||
1da177e4 LT |
2498 | /** |
2499 | * vsscanf - Unformat a buffer into a list of arguments | |
2500 | * @buf: input buffer | |
2501 | * @fmt: format of buffer | |
2502 | * @args: arguments | |
2503 | */ | |
7b9186f5 | 2504 | int vsscanf(const char *buf, const char *fmt, va_list args) |
1da177e4 LT |
2505 | { |
2506 | const char *str = buf; | |
2507 | char *next; | |
2508 | char digit; | |
2509 | int num = 0; | |
ef0658f3 | 2510 | u8 qualifier; |
53809751 JB |
2511 | unsigned int base; |
2512 | union { | |
2513 | long long s; | |
2514 | unsigned long long u; | |
2515 | } val; | |
ef0658f3 | 2516 | s16 field_width; |
d4be151b | 2517 | bool is_sign; |
1da177e4 | 2518 | |
da99075c | 2519 | while (*fmt) { |
1da177e4 LT |
2520 | /* skip any white space in format */ |
2521 | /* white space in format matchs any amount of | |
2522 | * white space, including none, in the input. | |
2523 | */ | |
2524 | if (isspace(*fmt)) { | |
e7d2860b AGR |
2525 | fmt = skip_spaces(++fmt); |
2526 | str = skip_spaces(str); | |
1da177e4 LT |
2527 | } |
2528 | ||
2529 | /* anything that is not a conversion must match exactly */ | |
2530 | if (*fmt != '%' && *fmt) { | |
2531 | if (*fmt++ != *str++) | |
2532 | break; | |
2533 | continue; | |
2534 | } | |
2535 | ||
2536 | if (!*fmt) | |
2537 | break; | |
2538 | ++fmt; | |
7b9186f5 | 2539 | |
1da177e4 LT |
2540 | /* skip this conversion. |
2541 | * advance both strings to next white space | |
2542 | */ | |
2543 | if (*fmt == '*') { | |
da99075c JB |
2544 | if (!*str) |
2545 | break; | |
8fccae2c | 2546 | while (!isspace(*fmt) && *fmt != '%' && *fmt) |
1da177e4 LT |
2547 | fmt++; |
2548 | while (!isspace(*str) && *str) | |
2549 | str++; | |
2550 | continue; | |
2551 | } | |
2552 | ||
2553 | /* get field width */ | |
2554 | field_width = -1; | |
53809751 | 2555 | if (isdigit(*fmt)) { |
1da177e4 | 2556 | field_width = skip_atoi(&fmt); |
53809751 JB |
2557 | if (field_width <= 0) |
2558 | break; | |
2559 | } | |
1da177e4 LT |
2560 | |
2561 | /* get conversion qualifier */ | |
2562 | qualifier = -1; | |
75fb8f26 AS |
2563 | if (*fmt == 'h' || _tolower(*fmt) == 'l' || |
2564 | _tolower(*fmt) == 'z') { | |
1da177e4 LT |
2565 | qualifier = *fmt++; |
2566 | if (unlikely(qualifier == *fmt)) { | |
2567 | if (qualifier == 'h') { | |
2568 | qualifier = 'H'; | |
2569 | fmt++; | |
2570 | } else if (qualifier == 'l') { | |
2571 | qualifier = 'L'; | |
2572 | fmt++; | |
2573 | } | |
2574 | } | |
2575 | } | |
1da177e4 | 2576 | |
da99075c JB |
2577 | if (!*fmt) |
2578 | break; | |
2579 | ||
2580 | if (*fmt == 'n') { | |
2581 | /* return number of characters read so far */ | |
2582 | *va_arg(args, int *) = str - buf; | |
2583 | ++fmt; | |
2584 | continue; | |
2585 | } | |
2586 | ||
2587 | if (!*str) | |
1da177e4 LT |
2588 | break; |
2589 | ||
d4be151b | 2590 | base = 10; |
3f623eba | 2591 | is_sign = false; |
d4be151b | 2592 | |
7b9186f5 | 2593 | switch (*fmt++) { |
1da177e4 LT |
2594 | case 'c': |
2595 | { | |
7b9186f5 | 2596 | char *s = (char *)va_arg(args, char*); |
1da177e4 LT |
2597 | if (field_width == -1) |
2598 | field_width = 1; | |
2599 | do { | |
2600 | *s++ = *str++; | |
2601 | } while (--field_width > 0 && *str); | |
2602 | num++; | |
2603 | } | |
2604 | continue; | |
2605 | case 's': | |
2606 | { | |
7b9186f5 AGR |
2607 | char *s = (char *)va_arg(args, char *); |
2608 | if (field_width == -1) | |
4be929be | 2609 | field_width = SHRT_MAX; |
1da177e4 | 2610 | /* first, skip leading white space in buffer */ |
e7d2860b | 2611 | str = skip_spaces(str); |
1da177e4 LT |
2612 | |
2613 | /* now copy until next white space */ | |
7b9186f5 | 2614 | while (*str && !isspace(*str) && field_width--) |
1da177e4 | 2615 | *s++ = *str++; |
1da177e4 LT |
2616 | *s = '\0'; |
2617 | num++; | |
2618 | } | |
2619 | continue; | |
1da177e4 LT |
2620 | case 'o': |
2621 | base = 8; | |
2622 | break; | |
2623 | case 'x': | |
2624 | case 'X': | |
2625 | base = 16; | |
2626 | break; | |
2627 | case 'i': | |
7b9186f5 | 2628 | base = 0; |
1da177e4 | 2629 | case 'd': |
3f623eba | 2630 | is_sign = true; |
1da177e4 LT |
2631 | case 'u': |
2632 | break; | |
2633 | case '%': | |
2634 | /* looking for '%' in str */ | |
7b9186f5 | 2635 | if (*str++ != '%') |
1da177e4 LT |
2636 | return num; |
2637 | continue; | |
2638 | default: | |
2639 | /* invalid format; stop here */ | |
2640 | return num; | |
2641 | } | |
2642 | ||
2643 | /* have some sort of integer conversion. | |
2644 | * first, skip white space in buffer. | |
2645 | */ | |
e7d2860b | 2646 | str = skip_spaces(str); |
1da177e4 LT |
2647 | |
2648 | digit = *str; | |
2649 | if (is_sign && digit == '-') | |
2650 | digit = *(str + 1); | |
2651 | ||
2652 | if (!digit | |
7b9186f5 AGR |
2653 | || (base == 16 && !isxdigit(digit)) |
2654 | || (base == 10 && !isdigit(digit)) | |
2655 | || (base == 8 && (!isdigit(digit) || digit > '7')) | |
2656 | || (base == 0 && !isdigit(digit))) | |
2657 | break; | |
1da177e4 | 2658 | |
53809751 JB |
2659 | if (is_sign) |
2660 | val.s = qualifier != 'L' ? | |
2661 | simple_strtol(str, &next, base) : | |
2662 | simple_strtoll(str, &next, base); | |
2663 | else | |
2664 | val.u = qualifier != 'L' ? | |
2665 | simple_strtoul(str, &next, base) : | |
2666 | simple_strtoull(str, &next, base); | |
2667 | ||
2668 | if (field_width > 0 && next - str > field_width) { | |
2669 | if (base == 0) | |
2670 | _parse_integer_fixup_radix(str, &base); | |
2671 | while (next - str > field_width) { | |
2672 | if (is_sign) | |
2673 | val.s = div_s64(val.s, base); | |
2674 | else | |
2675 | val.u = div_u64(val.u, base); | |
2676 | --next; | |
2677 | } | |
2678 | } | |
2679 | ||
7b9186f5 | 2680 | switch (qualifier) { |
1da177e4 | 2681 | case 'H': /* that's 'hh' in format */ |
53809751 JB |
2682 | if (is_sign) |
2683 | *va_arg(args, signed char *) = val.s; | |
2684 | else | |
2685 | *va_arg(args, unsigned char *) = val.u; | |
1da177e4 LT |
2686 | break; |
2687 | case 'h': | |
53809751 JB |
2688 | if (is_sign) |
2689 | *va_arg(args, short *) = val.s; | |
2690 | else | |
2691 | *va_arg(args, unsigned short *) = val.u; | |
1da177e4 LT |
2692 | break; |
2693 | case 'l': | |
53809751 JB |
2694 | if (is_sign) |
2695 | *va_arg(args, long *) = val.s; | |
2696 | else | |
2697 | *va_arg(args, unsigned long *) = val.u; | |
1da177e4 LT |
2698 | break; |
2699 | case 'L': | |
53809751 JB |
2700 | if (is_sign) |
2701 | *va_arg(args, long long *) = val.s; | |
2702 | else | |
2703 | *va_arg(args, unsigned long long *) = val.u; | |
1da177e4 LT |
2704 | break; |
2705 | case 'Z': | |
2706 | case 'z': | |
53809751 JB |
2707 | *va_arg(args, size_t *) = val.u; |
2708 | break; | |
1da177e4 | 2709 | default: |
53809751 JB |
2710 | if (is_sign) |
2711 | *va_arg(args, int *) = val.s; | |
2712 | else | |
2713 | *va_arg(args, unsigned int *) = val.u; | |
1da177e4 LT |
2714 | break; |
2715 | } | |
2716 | num++; | |
2717 | ||
2718 | if (!next) | |
2719 | break; | |
2720 | str = next; | |
2721 | } | |
c6b40d16 | 2722 | |
1da177e4 LT |
2723 | return num; |
2724 | } | |
1da177e4 LT |
2725 | EXPORT_SYMBOL(vsscanf); |
2726 | ||
2727 | /** | |
2728 | * sscanf - Unformat a buffer into a list of arguments | |
2729 | * @buf: input buffer | |
2730 | * @fmt: formatting of buffer | |
2731 | * @...: resulting arguments | |
2732 | */ | |
7b9186f5 | 2733 | int sscanf(const char *buf, const char *fmt, ...) |
1da177e4 LT |
2734 | { |
2735 | va_list args; | |
2736 | int i; | |
2737 | ||
7b9186f5 AGR |
2738 | va_start(args, fmt); |
2739 | i = vsscanf(buf, fmt, args); | |
1da177e4 | 2740 | va_end(args); |
7b9186f5 | 2741 | |
1da177e4 LT |
2742 | return i; |
2743 | } | |
1da177e4 | 2744 | EXPORT_SYMBOL(sscanf); |