blob: d3023df8477f67285c43129574148264237a8d60 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080012/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
14 * - changed to provide snprintf and vsnprintf functions
15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
16 * - scnprintf and vscnprintf
17 */
18
19#include <stdarg.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/ctype.h>
24#include <linux/kernel.h>
Linus Torvalds0fe1ef22008-07-06 16:43:12 -070025#include <linux/kallsyms.h>
26#include <linux/uaccess.h>
Linus Torvalds332d2e72008-10-20 15:07:34 +110027#include <linux/ioport.h>
Joe Perches8a27f7c2009-08-17 12:29:44 +000028#include <net/addrconf.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Tim Schmielau4e57b682005-10-30 15:03:48 -080030#include <asm/page.h> /* for PAGE_SIZE */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <asm/div64.h>
James Bottomleydeac93d2008-09-03 20:43:36 -050032#include <asm/sections.h> /* for dereference_function_descriptor() */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Denys Vlasenko9b706ae2008-02-09 23:24:09 +010034/* Works only for digits and letters, but small and fast */
35#define TOLOWER(x) ((x) | 0x20)
36
Harvey Harrisonaa46a632008-10-16 13:40:34 -070037static unsigned int simple_guess_base(const char *cp)
38{
39 if (cp[0] == '0') {
40 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
41 return 16;
42 else
43 return 8;
44 } else {
45 return 10;
46 }
47}
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 * simple_strtoull - convert a string to an unsigned long long
51 * @cp: The start of the string
52 * @endp: A pointer to the end of the parsed string will be placed here
53 * @base: The number base to use
54 */
Harvey Harrison22d27052008-10-16 13:40:35 -070055unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Harvey Harrisonaa46a632008-10-16 13:40:34 -070057 unsigned long long result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Harvey Harrisonaa46a632008-10-16 13:40:34 -070059 if (!base)
60 base = simple_guess_base(cp);
61
62 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
63 cp += 2;
64
65 while (isxdigit(*cp)) {
66 unsigned int value;
67
68 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
69 if (value >= base)
70 break;
71 result = result * base + value;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 cp++;
73 }
74 if (endp)
75 *endp = (char *)cp;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -080076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 return result;
78}
Linus Torvalds1da177e2005-04-16 15:20:36 -070079EXPORT_SYMBOL(simple_strtoull);
80
81/**
André Goddard Rosa922ac252009-12-14 18:01:01 -080082 * simple_strtoul - convert a string to an unsigned long
83 * @cp: The start of the string
84 * @endp: A pointer to the end of the parsed string will be placed here
85 * @base: The number base to use
86 */
87unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
88{
89 return simple_strtoull(cp, endp, base);
90}
91EXPORT_SYMBOL(simple_strtoul);
92
93/**
94 * simple_strtol - convert a string to a signed long
95 * @cp: The start of the string
96 * @endp: A pointer to the end of the parsed string will be placed here
97 * @base: The number base to use
98 */
99long simple_strtol(const char *cp, char **endp, unsigned int base)
100{
101 if (*cp == '-')
102 return -simple_strtoul(cp + 1, endp, base);
103
104 return simple_strtoul(cp, endp, base);
105}
106EXPORT_SYMBOL(simple_strtol);
107
108/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 * simple_strtoll - convert a string to a signed long long
110 * @cp: The start of the string
111 * @endp: A pointer to the end of the parsed string will be placed here
112 * @base: The number base to use
113 */
Harvey Harrison22d27052008-10-16 13:40:35 -0700114long long simple_strtoll(const char *cp, char **endp, unsigned int base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800116 if (*cp == '-')
Harvey Harrison22d27052008-10-16 13:40:35 -0700117 return -simple_strtoull(cp + 1, endp, base);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800118
Harvey Harrison22d27052008-10-16 13:40:35 -0700119 return simple_strtoull(cp, endp, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120}
Hans Verkuil98d5ce02010-04-23 13:18:04 -0400121EXPORT_SYMBOL(simple_strtoll);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Yi Yang06b2a762008-02-08 04:21:57 -0800123/**
124 * strict_strtoul - convert a string to an unsigned long strictly
125 * @cp: The string to be converted
126 * @base: The number base to use
127 * @res: The converted result value
128 *
129 * strict_strtoul converts a string to an unsigned long only if the
130 * string is really an unsigned long string, any string containing
131 * any invalid char at the tail will be rejected and -EINVAL is returned,
132 * only a newline char at the tail is acceptible because people generally
133 * change a module parameter in the following way:
134 *
135 * echo 1024 > /sys/module/e1000/parameters/copybreak
136 *
137 * echo will append a newline to the tail.
138 *
139 * It returns 0 if conversion is successful and *res is set to the converted
140 * value, otherwise it returns -EINVAL and *res is set to 0.
141 *
142 * simple_strtoul just ignores the successive invalid characters and
143 * return the converted value of prefix part of the string.
144 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700145int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
146{
147 char *tail;
148 unsigned long val;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700149
150 *res = 0;
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700151 if (!*cp)
Harvey Harrison9d85db22008-10-16 13:40:35 -0700152 return -EINVAL;
153
154 val = simple_strtoul(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800155 if (tail == cp)
156 return -EINVAL;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800157
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700158 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
Harvey Harrison9d85db22008-10-16 13:40:35 -0700159 *res = val;
160 return 0;
161 }
162
163 return -EINVAL;
164}
165EXPORT_SYMBOL(strict_strtoul);
Yi Yang06b2a762008-02-08 04:21:57 -0800166
167/**
168 * strict_strtol - convert a string to a long strictly
169 * @cp: The string to be converted
170 * @base: The number base to use
171 * @res: The converted result value
172 *
173 * strict_strtol is similiar to strict_strtoul, but it allows the first
174 * character of a string is '-'.
175 *
176 * It returns 0 if conversion is successful and *res is set to the converted
177 * value, otherwise it returns -EINVAL and *res is set to 0.
178 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700179int strict_strtol(const char *cp, unsigned int base, long *res)
180{
181 int ret;
182 if (*cp == '-') {
183 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
184 if (!ret)
185 *res = -(*res);
186 } else {
187 ret = strict_strtoul(cp, base, (unsigned long *)res);
188 }
189
190 return ret;
191}
192EXPORT_SYMBOL(strict_strtol);
Yi Yang06b2a762008-02-08 04:21:57 -0800193
194/**
195 * strict_strtoull - convert a string to an unsigned long long strictly
196 * @cp: The string to be converted
197 * @base: The number base to use
198 * @res: The converted result value
199 *
200 * strict_strtoull converts a string to an unsigned long long only if the
201 * string is really an unsigned long long string, any string containing
202 * any invalid char at the tail will be rejected and -EINVAL is returned,
203 * only a newline char at the tail is acceptible because people generally
204 * change a module parameter in the following way:
205 *
206 * echo 1024 > /sys/module/e1000/parameters/copybreak
207 *
208 * echo will append a newline to the tail of the string.
209 *
210 * It returns 0 if conversion is successful and *res is set to the converted
211 * value, otherwise it returns -EINVAL and *res is set to 0.
212 *
213 * simple_strtoull just ignores the successive invalid characters and
214 * return the converted value of prefix part of the string.
215 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700216int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
217{
218 char *tail;
219 unsigned long long val;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700220
221 *res = 0;
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700222 if (!*cp)
Harvey Harrison9d85db22008-10-16 13:40:35 -0700223 return -EINVAL;
224
225 val = simple_strtoull(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800226 if (tail == cp)
227 return -EINVAL;
Michal Nazarewicz559b1402010-08-09 17:20:54 -0700228 if ((tail[0] == '\0') || (tail[0] == '\n' && tail[1] == '\0')) {
Harvey Harrison9d85db22008-10-16 13:40:35 -0700229 *res = val;
230 return 0;
231 }
232
233 return -EINVAL;
234}
235EXPORT_SYMBOL(strict_strtoull);
Yi Yang06b2a762008-02-08 04:21:57 -0800236
237/**
238 * strict_strtoll - convert a string to a long long strictly
239 * @cp: The string to be converted
240 * @base: The number base to use
241 * @res: The converted result value
242 *
243 * strict_strtoll is similiar to strict_strtoull, but it allows the first
244 * character of a string is '-'.
245 *
246 * It returns 0 if conversion is successful and *res is set to the converted
247 * value, otherwise it returns -EINVAL and *res is set to 0.
248 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700249int strict_strtoll(const char *cp, unsigned int base, long long *res)
250{
251 int ret;
252 if (*cp == '-') {
253 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
254 if (!ret)
255 *res = -(*res);
256 } else {
257 ret = strict_strtoull(cp, base, (unsigned long long *)res);
258 }
Yi Yang06b2a762008-02-08 04:21:57 -0800259
Harvey Harrison9d85db22008-10-16 13:40:35 -0700260 return ret;
261}
Yi Yang06b2a762008-02-08 04:21:57 -0800262EXPORT_SYMBOL(strict_strtoll);
Yi Yang06b2a762008-02-08 04:21:57 -0800263
Joe Perchescf3b4292010-05-24 14:33:16 -0700264static noinline_for_stack
265int skip_atoi(const char **s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800267 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 while (isdigit(**s))
270 i = i*10 + *((*s)++) - '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return i;
273}
274
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700275/* Decimal conversion is by far the most typical, and is used
276 * for /proc and /sys data. This directly impacts e.g. top performance
277 * with many processes running. We optimize it for speed
278 * using code from
279 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
280 * (with permission from the author, Douglas W. Jones). */
281
282/* Formats correctly any integer in [0,99999].
283 * Outputs from one to five digits depending on input.
284 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
Joe Perchescf3b4292010-05-24 14:33:16 -0700285static noinline_for_stack
286char *put_dec_trunc(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700287{
288 unsigned d3, d2, d1, d0;
289 d1 = (q>>4) & 0xf;
290 d2 = (q>>8) & 0xf;
291 d3 = (q>>12);
292
293 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
294 q = (d0 * 0xcd) >> 11;
295 d0 = d0 - 10*q;
296 *buf++ = d0 + '0'; /* least significant digit */
297 d1 = q + 9*d3 + 5*d2 + d1;
298 if (d1 != 0) {
299 q = (d1 * 0xcd) >> 11;
300 d1 = d1 - 10*q;
301 *buf++ = d1 + '0'; /* next digit */
302
303 d2 = q + 2*d2;
304 if ((d2 != 0) || (d3 != 0)) {
305 q = (d2 * 0xd) >> 7;
306 d2 = d2 - 10*q;
307 *buf++ = d2 + '0'; /* next digit */
308
309 d3 = q + 4*d3;
310 if (d3 != 0) {
311 q = (d3 * 0xcd) >> 11;
312 d3 = d3 - 10*q;
313 *buf++ = d3 + '0'; /* next digit */
314 if (q != 0)
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800315 *buf++ = q + '0'; /* most sign. digit */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700316 }
317 }
318 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800319
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700320 return buf;
321}
322/* Same with if's removed. Always emits five digits */
Joe Perchescf3b4292010-05-24 14:33:16 -0700323static noinline_for_stack
324char *put_dec_full(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700325{
326 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
327 /* but anyway, gcc produces better code with full-sized ints */
328 unsigned d3, d2, d1, d0;
329 d1 = (q>>4) & 0xf;
330 d2 = (q>>8) & 0xf;
331 d3 = (q>>12);
332
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800333 /*
334 * Possible ways to approx. divide by 10
335 * gcc -O2 replaces multiply with shifts and adds
336 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
337 * (x * 0x67) >> 10: 1100111
338 * (x * 0x34) >> 9: 110100 - same
339 * (x * 0x1a) >> 8: 11010 - same
340 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
341 */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700342 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
343 q = (d0 * 0xcd) >> 11;
344 d0 = d0 - 10*q;
345 *buf++ = d0 + '0';
346 d1 = q + 9*d3 + 5*d2 + d1;
347 q = (d1 * 0xcd) >> 11;
348 d1 = d1 - 10*q;
349 *buf++ = d1 + '0';
350
351 d2 = q + 2*d2;
352 q = (d2 * 0xd) >> 7;
353 d2 = d2 - 10*q;
354 *buf++ = d2 + '0';
355
356 d3 = q + 4*d3;
357 q = (d3 * 0xcd) >> 11; /* - shorter code */
358 /* q = (d3 * 0x67) >> 10; - would also work */
359 d3 = d3 - 10*q;
360 *buf++ = d3 + '0';
361 *buf++ = q + '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800362
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700363 return buf;
364}
365/* No inlining helps gcc to use registers better */
Joe Perchescf3b4292010-05-24 14:33:16 -0700366static noinline_for_stack
367char *put_dec(char *buf, unsigned long long num)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700368{
369 while (1) {
370 unsigned rem;
371 if (num < 100000)
372 return put_dec_trunc(buf, num);
373 rem = do_div(num, 100000);
374 buf = put_dec_full(buf, rem);
375 }
376}
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378#define ZEROPAD 1 /* pad with zero */
379#define SIGN 2 /* unsigned/signed long */
380#define PLUS 4 /* show plus */
381#define SPACE 8 /* space if plus */
382#define LEFT 16 /* left justified */
Bjorn Helgaasb89dc5d2010-03-05 10:47:31 -0700383#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
384#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100386enum format_type {
387 FORMAT_TYPE_NONE, /* Just a string part */
Vegard Nossumed681a92009-03-14 12:08:50 +0100388 FORMAT_TYPE_WIDTH,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100389 FORMAT_TYPE_PRECISION,
390 FORMAT_TYPE_CHAR,
391 FORMAT_TYPE_STR,
392 FORMAT_TYPE_PTR,
393 FORMAT_TYPE_PERCENT_CHAR,
394 FORMAT_TYPE_INVALID,
395 FORMAT_TYPE_LONG_LONG,
396 FORMAT_TYPE_ULONG,
397 FORMAT_TYPE_LONG,
Zhaoleia4e94ef2009-03-27 17:07:05 +0800398 FORMAT_TYPE_UBYTE,
399 FORMAT_TYPE_BYTE,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100400 FORMAT_TYPE_USHORT,
401 FORMAT_TYPE_SHORT,
402 FORMAT_TYPE_UINT,
403 FORMAT_TYPE_INT,
404 FORMAT_TYPE_NRCHARS,
405 FORMAT_TYPE_SIZE_T,
406 FORMAT_TYPE_PTRDIFF
407};
408
409struct printf_spec {
Joe Perches4e310fd2010-04-14 09:27:40 -0700410 u8 type; /* format_type enum */
Joe Perchesef0658f2010-03-06 17:10:14 -0800411 u8 flags; /* flags to number() */
Joe Perches4e310fd2010-04-14 09:27:40 -0700412 u8 base; /* number base, 8, 10 or 16 only */
413 u8 qualifier; /* number qualifier, one of 'hHlLtzZ' */
414 s16 field_width; /* width of output field */
415 s16 precision; /* # of digits/chars */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100416};
417
Joe Perchescf3b4292010-05-24 14:33:16 -0700418static noinline_for_stack
419char *number(char *buf, char *end, unsigned long long num,
420 struct printf_spec spec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100422 /* we are called with base 8, 10 or 16, only, thus don't need "G..." */
423 static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
424
425 char tmp[66];
426 char sign;
427 char locase;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100428 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 int i;
430
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100431 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
432 * produces same digits or (maybe lowercased) letters */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100433 locase = (spec.flags & SMALL);
434 if (spec.flags & LEFT)
435 spec.flags &= ~ZEROPAD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 sign = 0;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100437 if (spec.flags & SIGN) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800438 if ((signed long long)num < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 sign = '-';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800440 num = -(signed long long)num;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100441 spec.field_width--;
442 } else if (spec.flags & PLUS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 sign = '+';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100444 spec.field_width--;
445 } else if (spec.flags & SPACE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 sign = ' ';
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100447 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
449 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700450 if (need_pfx) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100451 spec.field_width--;
452 if (spec.base == 16)
453 spec.field_width--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700455
456 /* generate full string in tmp[], in reverse order */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 i = 0;
458 if (num == 0)
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700459 tmp[i++] = '0';
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700460 /* Generic code, for any base:
461 else do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100462 tmp[i++] = (digits[do_div(num,base)] | locase);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700463 } while (num != 0);
464 */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100465 else if (spec.base != 10) { /* 8 or 16 */
466 int mask = spec.base - 1;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700467 int shift = 3;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800468
469 if (spec.base == 16)
470 shift = 4;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700471 do {
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100472 tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700473 num >>= shift;
474 } while (num);
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700475 } else { /* base 10 */
476 i = put_dec(tmp, num) - tmp;
477 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700478
479 /* printing 100 using %2d gives "100", not "00" */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100480 if (i > spec.precision)
481 spec.precision = i;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700482 /* leading space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100483 spec.field_width -= spec.precision;
484 if (!(spec.flags & (ZEROPAD+LEFT))) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800485 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700486 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 *buf = ' ';
488 ++buf;
489 }
490 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700491 /* sign */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 if (sign) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700493 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 *buf = sign;
495 ++buf;
496 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700497 /* "0x" / "0" prefix */
498 if (need_pfx) {
499 if (buf < end)
500 *buf = '0';
501 ++buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100502 if (spec.base == 16) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700503 if (buf < end)
Denys Vlasenko9b706ae2008-02-09 23:24:09 +0100504 *buf = ('X' | locase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 ++buf;
506 }
507 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700508 /* zero or space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100509 if (!(spec.flags & LEFT)) {
510 char c = (spec.flags & ZEROPAD) ? '0' : ' ';
511 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700512 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 *buf = c;
514 ++buf;
515 }
516 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700517 /* hmm even more zero padding? */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100518 while (i <= --spec.precision) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700519 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 *buf = '0';
521 ++buf;
522 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700523 /* actual digits of result */
524 while (--i >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700525 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 *buf = tmp[i];
527 ++buf;
528 }
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700529 /* trailing space padding */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100530 while (--spec.field_width >= 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -0700531 if (buf < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 *buf = ' ';
533 ++buf;
534 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 return buf;
537}
538
Joe Perchescf3b4292010-05-24 14:33:16 -0700539static noinline_for_stack
540char *string(char *buf, char *end, const char *s, struct printf_spec spec)
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700541{
542 int len, i;
543
544 if ((unsigned long)s < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -0800545 s = "(null)";
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700546
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100547 len = strnlen(s, spec.precision);
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700548
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100549 if (!(spec.flags & LEFT)) {
550 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700551 if (buf < end)
552 *buf = ' ';
553 ++buf;
554 }
555 }
556 for (i = 0; i < len; ++i) {
557 if (buf < end)
558 *buf = *s;
559 ++buf; ++s;
560 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100561 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700562 if (buf < end)
563 *buf = ' ';
564 ++buf;
565 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800566
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700567 return buf;
568}
569
Joe Perchescf3b4292010-05-24 14:33:16 -0700570static noinline_for_stack
571char *symbol_string(char *buf, char *end, void *ptr,
572 struct printf_spec spec, char ext)
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700573{
574 unsigned long value = (unsigned long) ptr;
575#ifdef CONFIG_KALLSYMS
576 char sym[KSYM_SYMBOL_LEN];
Steven Rostedt91adcd22009-09-16 20:03:06 -0400577 if (ext != 'f' && ext != 's')
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200578 sprint_symbol(sym, value);
579 else
580 kallsyms_lookup(value, NULL, NULL, NULL, sym);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800581
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100582 return string(buf, end, sym, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700583#else
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800584 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100585 spec.flags |= SPECIAL | SMALL | ZEROPAD;
586 spec.base = 16;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800587
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100588 return number(buf, end, value, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700589#endif
590}
591
Joe Perchescf3b4292010-05-24 14:33:16 -0700592static noinline_for_stack
593char *resource_string(char *buf, char *end, struct resource *res,
594 struct printf_spec spec, const char *fmt)
Linus Torvalds332d2e72008-10-20 15:07:34 +1100595{
596#ifndef IO_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600597#define IO_RSRC_PRINTK_SIZE 6
Linus Torvalds332d2e72008-10-20 15:07:34 +1100598#endif
599
600#ifndef MEM_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600601#define MEM_RSRC_PRINTK_SIZE 10
Linus Torvalds332d2e72008-10-20 15:07:34 +1100602#endif
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700603 static const struct printf_spec io_spec = {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100604 .base = 16,
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700605 .field_width = IO_RSRC_PRINTK_SIZE,
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100606 .precision = -1,
607 .flags = SPECIAL | SMALL | ZEROPAD,
608 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700609 static const struct printf_spec mem_spec = {
610 .base = 16,
611 .field_width = MEM_RSRC_PRINTK_SIZE,
612 .precision = -1,
613 .flags = SPECIAL | SMALL | ZEROPAD,
614 };
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700615 static const struct printf_spec bus_spec = {
616 .base = 16,
617 .field_width = 2,
618 .precision = -1,
619 .flags = SMALL | ZEROPAD,
620 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700621 static const struct printf_spec dec_spec = {
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600622 .base = 10,
623 .precision = -1,
624 .flags = 0,
625 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700626 static const struct printf_spec str_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600627 .field_width = -1,
628 .precision = 10,
629 .flags = LEFT,
630 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700631 static const struct printf_spec flag_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600632 .base = 16,
633 .precision = -1,
634 .flags = SPECIAL | SMALL,
635 };
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600636
637 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
638 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
639#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
640#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700641#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600642#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
643 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
644 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
645
Linus Torvalds332d2e72008-10-20 15:07:34 +1100646 char *p = sym, *pend = sym + sizeof(sym);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600647 int decode = (fmt[0] == 'R') ? 1 : 0;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700648 const struct printf_spec *specp;
Linus Torvalds332d2e72008-10-20 15:07:34 +1100649
650 *p++ = '[';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700651 if (res->flags & IORESOURCE_IO) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600652 p = string(p, pend, "io ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700653 specp = &io_spec;
654 } else if (res->flags & IORESOURCE_MEM) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600655 p = string(p, pend, "mem ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700656 specp = &mem_spec;
657 } else if (res->flags & IORESOURCE_IRQ) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600658 p = string(p, pend, "irq ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700659 specp = &dec_spec;
660 } else if (res->flags & IORESOURCE_DMA) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600661 p = string(p, pend, "dma ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700662 specp = &dec_spec;
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700663 } else if (res->flags & IORESOURCE_BUS) {
664 p = string(p, pend, "bus ", str_spec);
665 specp = &bus_spec;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700666 } else {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600667 p = string(p, pend, "??? ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700668 specp = &mem_spec;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600669 decode = 0;
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600670 }
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700671 p = number(p, pend, res->start, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600672 if (res->start != res->end) {
673 *p++ = '-';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700674 p = number(p, pend, res->end, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600675 }
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600676 if (decode) {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600677 if (res->flags & IORESOURCE_MEM_64)
678 p = string(p, pend, " 64bit", str_spec);
679 if (res->flags & IORESOURCE_PREFETCH)
680 p = string(p, pend, " pref", str_spec);
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700681 if (res->flags & IORESOURCE_WINDOW)
682 p = string(p, pend, " window", str_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600683 if (res->flags & IORESOURCE_DISABLED)
684 p = string(p, pend, " disabled", str_spec);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600685 } else {
686 p = string(p, pend, " flags ", str_spec);
687 p = number(p, pend, res->flags, flag_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600688 }
Linus Torvalds332d2e72008-10-20 15:07:34 +1100689 *p++ = ']';
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600690 *p = '\0';
Linus Torvalds332d2e72008-10-20 15:07:34 +1100691
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100692 return string(buf, end, sym, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100693}
694
Joe Perchescf3b4292010-05-24 14:33:16 -0700695static noinline_for_stack
696char *mac_address_string(char *buf, char *end, u8 *addr,
697 struct printf_spec spec, const char *fmt)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700698{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000699 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700700 char *p = mac_addr;
701 int i;
Joe Perchesbc7259a2010-01-07 11:43:50 +0000702 char separator;
703
704 if (fmt[1] == 'F') { /* FDDI canonical format */
Joe Perchesbc7259a2010-01-07 11:43:50 +0000705 separator = '-';
706 } else {
Joe Perchesbc7259a2010-01-07 11:43:50 +0000707 separator = ':';
708 }
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700709
710 for (i = 0; i < 6; i++) {
Joe Perchesc8e00062010-01-11 00:44:14 -0800711 p = pack_hex_byte(p, addr[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000712 if (fmt[0] == 'M' && i != 5)
Joe Perchesbc7259a2010-01-07 11:43:50 +0000713 *p++ = separator;
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700714 }
715 *p = '\0';
716
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100717 return string(buf, end, mac_addr, spec);
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700718}
719
Joe Perchescf3b4292010-05-24 14:33:16 -0700720static noinline_for_stack
721char *ip4_string(char *p, const u8 *addr, const char *fmt)
Harvey Harrison689afa72008-10-28 16:04:44 -0700722{
Harvey Harrison689afa72008-10-28 16:04:44 -0700723 int i;
Joe Perches0159f242010-01-13 20:23:30 -0800724 bool leading_zeros = (fmt[0] == 'i');
725 int index;
726 int step;
Harvey Harrison689afa72008-10-28 16:04:44 -0700727
Joe Perches0159f242010-01-13 20:23:30 -0800728 switch (fmt[2]) {
729 case 'h':
730#ifdef __BIG_ENDIAN
731 index = 0;
732 step = 1;
733#else
734 index = 3;
735 step = -1;
736#endif
737 break;
738 case 'l':
739 index = 3;
740 step = -1;
741 break;
742 case 'n':
743 case 'b':
744 default:
745 index = 0;
746 step = 1;
747 break;
748 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000749 for (i = 0; i < 4; i++) {
750 char temp[3]; /* hold each IP quad in reverse order */
Joe Perches0159f242010-01-13 20:23:30 -0800751 int digits = put_dec_trunc(temp, addr[index]) - temp;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000752 if (leading_zeros) {
753 if (digits < 3)
754 *p++ = '0';
755 if (digits < 2)
756 *p++ = '0';
757 }
758 /* reverse the digits in the quad */
759 while (digits--)
760 *p++ = temp[digits];
761 if (i < 3)
762 *p++ = '.';
Joe Perches0159f242010-01-13 20:23:30 -0800763 index += step;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000764 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000765 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800766
Joe Perches8a27f7c2009-08-17 12:29:44 +0000767 return p;
768}
769
Joe Perchescf3b4292010-05-24 14:33:16 -0700770static noinline_for_stack
771char *ip6_compressed_string(char *p, const char *addr)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000772{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800773 int i, j, range;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000774 unsigned char zerolength[8];
775 int longest = 1;
776 int colonpos = -1;
777 u16 word;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800778 u8 hi, lo;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000779 bool needcolon = false;
Joe Percheseb78cd22009-09-18 13:04:06 +0000780 bool useIPv4;
781 struct in6_addr in6;
782
783 memcpy(&in6, addr, sizeof(struct in6_addr));
784
785 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000786
787 memset(zerolength, 0, sizeof(zerolength));
788
789 if (useIPv4)
790 range = 6;
791 else
792 range = 8;
793
794 /* find position of longest 0 run */
795 for (i = 0; i < range; i++) {
796 for (j = i; j < range; j++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000797 if (in6.s6_addr16[j] != 0)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000798 break;
799 zerolength[i]++;
800 }
801 }
802 for (i = 0; i < range; i++) {
803 if (zerolength[i] > longest) {
804 longest = zerolength[i];
805 colonpos = i;
806 }
807 }
808
809 /* emit address */
810 for (i = 0; i < range; i++) {
811 if (i == colonpos) {
812 if (needcolon || i == 0)
813 *p++ = ':';
814 *p++ = ':';
815 needcolon = false;
816 i += longest - 1;
817 continue;
818 }
819 if (needcolon) {
820 *p++ = ':';
821 needcolon = false;
822 }
823 /* hex u16 without leading 0s */
Joe Percheseb78cd22009-09-18 13:04:06 +0000824 word = ntohs(in6.s6_addr16[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000825 hi = word >> 8;
826 lo = word & 0xff;
827 if (hi) {
828 if (hi > 0x0f)
829 p = pack_hex_byte(p, hi);
830 else
831 *p++ = hex_asc_lo(hi);
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800832 p = pack_hex_byte(p, lo);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000833 }
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800834 else if (lo > 0x0f)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000835 p = pack_hex_byte(p, lo);
836 else
837 *p++ = hex_asc_lo(lo);
838 needcolon = true;
839 }
840
841 if (useIPv4) {
842 if (needcolon)
843 *p++ = ':';
Joe Perches0159f242010-01-13 20:23:30 -0800844 p = ip4_string(p, &in6.s6_addr[12], "I4");
Joe Perches8a27f7c2009-08-17 12:29:44 +0000845 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000846 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800847
Joe Perches8a27f7c2009-08-17 12:29:44 +0000848 return p;
849}
850
Joe Perchescf3b4292010-05-24 14:33:16 -0700851static noinline_for_stack
852char *ip6_string(char *p, const char *addr, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000853{
854 int i;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800855
Harvey Harrison689afa72008-10-28 16:04:44 -0700856 for (i = 0; i < 8; i++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000857 p = pack_hex_byte(p, *addr++);
858 p = pack_hex_byte(p, *addr++);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000859 if (fmt[0] == 'I' && i != 7)
Harvey Harrison689afa72008-10-28 16:04:44 -0700860 *p++ = ':';
861 }
862 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800863
Joe Perches8a27f7c2009-08-17 12:29:44 +0000864 return p;
865}
866
Joe Perchescf3b4292010-05-24 14:33:16 -0700867static noinline_for_stack
868char *ip6_addr_string(char *buf, char *end, const u8 *addr,
869 struct printf_spec spec, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000870{
871 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
872
873 if (fmt[0] == 'I' && fmt[2] == 'c')
Joe Percheseb78cd22009-09-18 13:04:06 +0000874 ip6_compressed_string(ip6_addr, addr);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000875 else
Joe Percheseb78cd22009-09-18 13:04:06 +0000876 ip6_string(ip6_addr, addr, fmt);
Harvey Harrison689afa72008-10-28 16:04:44 -0700877
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100878 return string(buf, end, ip6_addr, spec);
Harvey Harrison689afa72008-10-28 16:04:44 -0700879}
880
Joe Perchescf3b4292010-05-24 14:33:16 -0700881static noinline_for_stack
882char *ip4_addr_string(char *buf, char *end, const u8 *addr,
883 struct printf_spec spec, const char *fmt)
Harvey Harrison4aa99602008-10-29 12:49:58 -0700884{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000885 char ip4_addr[sizeof("255.255.255.255")];
Harvey Harrison4aa99602008-10-29 12:49:58 -0700886
Joe Perches0159f242010-01-13 20:23:30 -0800887 ip4_string(ip4_addr, addr, fmt);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700888
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +0100889 return string(buf, end, ip4_addr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700890}
891
Joe Perchescf3b4292010-05-24 14:33:16 -0700892static noinline_for_stack
893char *uuid_string(char *buf, char *end, const u8 *addr,
894 struct printf_spec spec, const char *fmt)
Joe Perches9ac6e442009-12-14 18:01:09 -0800895{
896 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
897 char *p = uuid;
898 int i;
899 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
900 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
901 const u8 *index = be;
902 bool uc = false;
903
904 switch (*(++fmt)) {
905 case 'L':
906 uc = true; /* fall-through */
907 case 'l':
908 index = le;
909 break;
910 case 'B':
911 uc = true;
912 break;
913 }
914
915 for (i = 0; i < 16; i++) {
916 p = pack_hex_byte(p, addr[index[i]]);
917 switch (i) {
918 case 3:
919 case 5:
920 case 7:
921 case 9:
922 *p++ = '-';
923 break;
924 }
925 }
926
927 *p = 0;
928
929 if (uc) {
930 p = uuid;
931 do {
932 *p = toupper(*p);
933 } while (*(++p));
934 }
935
936 return string(buf, end, uuid, spec);
937}
938
Dan Rosenberg455cd5a2011-01-12 16:59:41 -0800939int kptr_restrict = 1;
940
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700941/*
942 * Show a '%p' thing. A kernel extension is that the '%p' is followed
943 * by an extra set of alphanumeric characters that are extended format
944 * specifiers.
945 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100946 * Right now we handle:
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700947 *
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200948 * - 'F' For symbolic function descriptor pointers with offset
949 * - 'f' For simple symbolic function names without offset
Steven Rostedt0efb4d22009-09-17 09:27:29 -0400950 * - 'S' For symbolic direct pointers with offset
951 * - 's' For symbolic direct pointers without offset
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600952 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
953 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700954 * - 'M' For a 6-byte MAC address, it prints the address in the
955 * usual colon-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000956 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
Joe Perchesbc7259a2010-01-07 11:43:50 +0000957 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
Joe Perchesc8e00062010-01-11 00:44:14 -0800958 * with a dash-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000959 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
960 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
961 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
962 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
963 * IPv6 omits the colons (01020304...0f)
964 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
Joe Perches0159f242010-01-13 20:23:30 -0800965 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
Joe Perches8a27f7c2009-08-17 12:29:44 +0000966 * - 'I6c' for IPv6 addresses printed as specified by
Uwe Kleine-König3f472402010-01-08 14:43:02 -0800967 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
Joe Perches9ac6e442009-12-14 18:01:09 -0800968 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
969 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
970 * Options for %pU are:
971 * b big endian lower case hex (default)
972 * B big endian UPPER case hex
973 * l little endian lower case hex
974 * L little endian UPPER case hex
975 * big endian output byte order is:
976 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
977 * little endian output byte order is:
978 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
Joe Perches7db6f5f2010-06-27 01:02:33 +0000979 * - 'V' For a struct va_format which contains a format string * and va_list *,
980 * call vsnprintf(->format, *->va_list).
981 * Implements a "recursive vsnprintf".
982 * Do not use this feature without some mechanism to verify the
983 * correctness of the format string and va_list arguments.
Dan Rosenberg455cd5a2011-01-12 16:59:41 -0800984 * - 'K' For a kernel pointer that should be hidden from unprivileged users
Joe Perches9ac6e442009-12-14 18:01:09 -0800985 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100986 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
987 * function pointers are really function descriptors, which contain a
988 * pointer to the real address.
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700989 */
Joe Perchescf3b4292010-05-24 14:33:16 -0700990static noinline_for_stack
991char *pointer(const char *fmt, char *buf, char *end, void *ptr,
992 struct printf_spec spec)
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700993{
Joe Perches5e057982010-10-26 14:22:50 -0700994 if (!ptr) {
995 /*
996 * Print (null) with the same width as a pointer so it makes
997 * tabular output look nice.
998 */
999 if (spec.field_width == -1)
1000 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001001 return string(buf, end, "(null)", spec);
Joe Perches5e057982010-10-26 14:22:50 -07001002 }
Linus Torvaldsd97106a2009-01-03 11:46:17 -08001003
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001004 switch (*fmt) {
1005 case 'F':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001006 case 'f':
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001007 ptr = dereference_function_descriptor(ptr);
1008 /* Fallthrough */
1009 case 'S':
Joe Perches9ac6e442009-12-14 18:01:09 -08001010 case 's':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001011 return symbol_string(buf, end, ptr, spec, *fmt);
Linus Torvalds332d2e72008-10-20 15:07:34 +11001012 case 'R':
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -06001013 case 'r':
Bjorn Helgaasfd955412009-10-06 15:33:39 -06001014 return resource_string(buf, end, ptr, spec, fmt);
Joe Perches8a27f7c2009-08-17 12:29:44 +00001015 case 'M': /* Colon separated: 00:01:02:03:04:05 */
1016 case 'm': /* Contiguous: 000102030405 */
Joe Perchesbc7259a2010-01-07 11:43:50 +00001017 /* [mM]F (FDDI, bit reversed) */
Joe Perches8a27f7c2009-08-17 12:29:44 +00001018 return mac_address_string(buf, end, ptr, spec, fmt);
1019 case 'I': /* Formatted IP supported
1020 * 4: 1.2.3.4
1021 * 6: 0001:0203:...:0708
1022 * 6c: 1::708 or 1::1.2.3.4
1023 */
1024 case 'i': /* Contiguous:
1025 * 4: 001.002.003.004
1026 * 6: 000102...0f
1027 */
1028 switch (fmt[1]) {
1029 case '6':
1030 return ip6_addr_string(buf, end, ptr, spec, fmt);
1031 case '4':
1032 return ip4_addr_string(buf, end, ptr, spec, fmt);
1033 }
Harvey Harrison4aa99602008-10-29 12:49:58 -07001034 break;
Joe Perches9ac6e442009-12-14 18:01:09 -08001035 case 'U':
1036 return uuid_string(buf, end, ptr, spec, fmt);
Joe Perches7db6f5f2010-06-27 01:02:33 +00001037 case 'V':
1038 return buf + vsnprintf(buf, end - buf,
1039 ((struct va_format *)ptr)->fmt,
1040 *(((struct va_format *)ptr)->va));
Dan Rosenberg455cd5a2011-01-12 16:59:41 -08001041 case 'K':
1042 /*
1043 * %pK cannot be used in IRQ context because its test
1044 * for CAP_SYSLOG would be meaningless.
1045 */
1046 if (in_irq() || in_serving_softirq() || in_nmi()) {
1047 if (spec.field_width == -1)
1048 spec.field_width = 2 * sizeof(void *);
1049 return string(buf, end, "pK-error", spec);
1050 } else if ((kptr_restrict == 0) ||
1051 (kptr_restrict == 1 &&
1052 has_capability_noaudit(current, CAP_SYSLOG)))
1053 break;
1054
1055 if (spec.field_width == -1) {
1056 spec.field_width = 2 * sizeof(void *);
1057 spec.flags |= ZEROPAD;
1058 }
1059 return number(buf, end, 0, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001060 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001061 spec.flags |= SMALL;
1062 if (spec.field_width == -1) {
Joe Perches5e057982010-10-26 14:22:50 -07001063 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001064 spec.flags |= ZEROPAD;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001065 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001066 spec.base = 16;
1067
1068 return number(buf, end, (unsigned long) ptr, spec);
1069}
1070
1071/*
1072 * Helper function to decode printf style format.
1073 * Each call decode a token from the format and return the
1074 * number of characters read (or likely the delta where it wants
1075 * to go on the next call).
1076 * The decoded token is returned through the parameters
1077 *
1078 * 'h', 'l', or 'L' for integer fields
1079 * 'z' support added 23/7/1999 S.H.
1080 * 'z' changed to 'Z' --davidm 1/25/99
1081 * 't' added for ptrdiff_t
1082 *
1083 * @fmt: the format string
1084 * @type of the token returned
1085 * @flags: various flags such as +, -, # tokens..
1086 * @field_width: overwritten width
1087 * @base: base of the number (octal, hex, ...)
1088 * @precision: precision of a number
1089 * @qualifier: qualifier of a number (long, size_t, ...)
1090 */
Joe Perchescf3b4292010-05-24 14:33:16 -07001091static noinline_for_stack
1092int format_decode(const char *fmt, struct printf_spec *spec)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001093{
1094 const char *start = fmt;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001095
1096 /* we finished early by reading the field width */
Vegard Nossumed681a92009-03-14 12:08:50 +01001097 if (spec->type == FORMAT_TYPE_WIDTH) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001098 if (spec->field_width < 0) {
1099 spec->field_width = -spec->field_width;
1100 spec->flags |= LEFT;
1101 }
1102 spec->type = FORMAT_TYPE_NONE;
1103 goto precision;
1104 }
1105
1106 /* we finished early by reading the precision */
1107 if (spec->type == FORMAT_TYPE_PRECISION) {
1108 if (spec->precision < 0)
1109 spec->precision = 0;
1110
1111 spec->type = FORMAT_TYPE_NONE;
1112 goto qualifier;
1113 }
1114
1115 /* By default */
1116 spec->type = FORMAT_TYPE_NONE;
1117
1118 for (; *fmt ; ++fmt) {
1119 if (*fmt == '%')
1120 break;
1121 }
1122
1123 /* Return the current non-format string */
1124 if (fmt != start || !*fmt)
1125 return fmt - start;
1126
1127 /* Process flags */
1128 spec->flags = 0;
1129
1130 while (1) { /* this also skips first '%' */
1131 bool found = true;
1132
1133 ++fmt;
1134
1135 switch (*fmt) {
1136 case '-': spec->flags |= LEFT; break;
1137 case '+': spec->flags |= PLUS; break;
1138 case ' ': spec->flags |= SPACE; break;
1139 case '#': spec->flags |= SPECIAL; break;
1140 case '0': spec->flags |= ZEROPAD; break;
1141 default: found = false;
1142 }
1143
1144 if (!found)
1145 break;
1146 }
1147
1148 /* get field width */
1149 spec->field_width = -1;
1150
1151 if (isdigit(*fmt))
1152 spec->field_width = skip_atoi(&fmt);
1153 else if (*fmt == '*') {
1154 /* it's the next argument */
Vegard Nossumed681a92009-03-14 12:08:50 +01001155 spec->type = FORMAT_TYPE_WIDTH;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001156 return ++fmt - start;
1157 }
1158
1159precision:
1160 /* get the precision */
1161 spec->precision = -1;
1162 if (*fmt == '.') {
1163 ++fmt;
1164 if (isdigit(*fmt)) {
1165 spec->precision = skip_atoi(&fmt);
1166 if (spec->precision < 0)
1167 spec->precision = 0;
1168 } else if (*fmt == '*') {
1169 /* it's the next argument */
Vegard Nossumadf26f82009-03-14 12:08:50 +01001170 spec->type = FORMAT_TYPE_PRECISION;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001171 return ++fmt - start;
1172 }
1173 }
1174
1175qualifier:
1176 /* get the conversion qualifier */
1177 spec->qualifier = -1;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001178 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1179 TOLOWER(*fmt) == 'z' || *fmt == 't') {
Zhaoleia4e94ef2009-03-27 17:07:05 +08001180 spec->qualifier = *fmt++;
1181 if (unlikely(spec->qualifier == *fmt)) {
1182 if (spec->qualifier == 'l') {
1183 spec->qualifier = 'L';
1184 ++fmt;
1185 } else if (spec->qualifier == 'h') {
1186 spec->qualifier = 'H';
1187 ++fmt;
1188 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001189 }
1190 }
1191
1192 /* default base */
1193 spec->base = 10;
1194 switch (*fmt) {
1195 case 'c':
1196 spec->type = FORMAT_TYPE_CHAR;
1197 return ++fmt - start;
1198
1199 case 's':
1200 spec->type = FORMAT_TYPE_STR;
1201 return ++fmt - start;
1202
1203 case 'p':
1204 spec->type = FORMAT_TYPE_PTR;
1205 return fmt - start;
1206 /* skip alnum */
1207
1208 case 'n':
1209 spec->type = FORMAT_TYPE_NRCHARS;
1210 return ++fmt - start;
1211
1212 case '%':
1213 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1214 return ++fmt - start;
1215
1216 /* integer number formats - set up the flags and "break" */
1217 case 'o':
1218 spec->base = 8;
1219 break;
1220
1221 case 'x':
1222 spec->flags |= SMALL;
1223
1224 case 'X':
1225 spec->base = 16;
1226 break;
1227
1228 case 'd':
1229 case 'i':
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001230 spec->flags |= SIGN;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001231 case 'u':
1232 break;
1233
1234 default:
1235 spec->type = FORMAT_TYPE_INVALID;
1236 return fmt - start;
1237 }
1238
1239 if (spec->qualifier == 'L')
1240 spec->type = FORMAT_TYPE_LONG_LONG;
1241 else if (spec->qualifier == 'l') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001242 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001243 spec->type = FORMAT_TYPE_LONG;
1244 else
1245 spec->type = FORMAT_TYPE_ULONG;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001246 } else if (TOLOWER(spec->qualifier) == 'z') {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001247 spec->type = FORMAT_TYPE_SIZE_T;
1248 } else if (spec->qualifier == 't') {
1249 spec->type = FORMAT_TYPE_PTRDIFF;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001250 } else if (spec->qualifier == 'H') {
1251 if (spec->flags & SIGN)
1252 spec->type = FORMAT_TYPE_BYTE;
1253 else
1254 spec->type = FORMAT_TYPE_UBYTE;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001255 } else if (spec->qualifier == 'h') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001256 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001257 spec->type = FORMAT_TYPE_SHORT;
1258 else
1259 spec->type = FORMAT_TYPE_USHORT;
1260 } else {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001261 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001262 spec->type = FORMAT_TYPE_INT;
1263 else
1264 spec->type = FORMAT_TYPE_UINT;
1265 }
1266
1267 return ++fmt - start;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001268}
1269
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270/**
1271 * vsnprintf - Format a string and place it in a buffer
1272 * @buf: The buffer to place the result into
1273 * @size: The size of the buffer, including the trailing null space
1274 * @fmt: The format string to use
1275 * @args: Arguments for the format string
1276 *
Andi Kleen20036fd2008-10-15 22:02:02 -07001277 * This function follows C99 vsnprintf, but has some extensions:
Steven Rostedt91adcd22009-09-16 20:03:06 -04001278 * %pS output the name of a text symbol with offset
1279 * %ps output the name of a text symbol without offset
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001280 * %pF output the name of a function pointer with its offset
1281 * %pf output the name of a function pointer without its offset
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001282 * %pR output the address range in a struct resource with decoded flags
1283 * %pr output the address range in a struct resource with raw flags
1284 * %pM output a 6-byte MAC address with colons
1285 * %pm output a 6-byte MAC address without colons
1286 * %pI4 print an IPv4 address without leading zeros
1287 * %pi4 print an IPv4 address with leading zeros
1288 * %pI6 print an IPv6 address with colons
1289 * %pi6 print an IPv6 address without colons
1290 * %pI6c print an IPv6 address as specified by
Uwe Kleine-König3f472402010-01-08 14:43:02 -08001291 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001292 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1293 * case.
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001294 * %n is ignored
Andi Kleen20036fd2008-10-15 22:02:02 -07001295 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 * The return value is the number of characters which would
1297 * be generated for the given input, excluding the trailing
1298 * '\0', as per ISO C99. If you want to have the exact
1299 * number of characters written into @buf as return value
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001300 * (not including the trailing '\0'), use vscnprintf(). If the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 * return is greater than or equal to @size, the resulting
1302 * string is truncated.
1303 *
1304 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001305 * You probably want snprintf() instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 */
1307int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1308{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 unsigned long long num;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001310 char *str, *end;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001311 struct printf_spec spec = {0};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001313 /* Reject out-of-range values early. Large positive sizes are
1314 used for unknown buffer sizes. */
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001315 if (WARN_ON_ONCE((int) size < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
1318 str = buf;
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001319 end = buf + size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001321 /* Make sure end is always >= buf */
1322 if (end < buf) {
1323 end = ((void *)-1);
1324 size = end - buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 }
1326
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001327 while (*fmt) {
1328 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001329 int read = format_decode(fmt, &spec);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001330
1331 fmt += read;
1332
1333 switch (spec.type) {
1334 case FORMAT_TYPE_NONE: {
1335 int copy = read;
1336 if (str < end) {
1337 if (copy > end - str)
1338 copy = end - str;
1339 memcpy(str, old_fmt, copy);
1340 }
1341 str += read;
1342 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 }
1344
Vegard Nossumed681a92009-03-14 12:08:50 +01001345 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001346 spec.field_width = va_arg(args, int);
1347 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001349 case FORMAT_TYPE_PRECISION:
1350 spec.precision = va_arg(args, int);
1351 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
André Goddard Rosad4be1512009-12-14 18:00:59 -08001353 case FORMAT_TYPE_CHAR: {
1354 char c;
1355
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001356 if (!(spec.flags & LEFT)) {
1357 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001358 if (str < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 *str = ' ';
1360 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001361
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001363 }
1364 c = (unsigned char) va_arg(args, int);
1365 if (str < end)
1366 *str = c;
1367 ++str;
1368 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001369 if (str < end)
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001370 *str = ' ';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001372 }
1373 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001374 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001376 case FORMAT_TYPE_STR:
1377 str = string(str, end, va_arg(args, char *), spec);
1378 break;
1379
1380 case FORMAT_TYPE_PTR:
1381 str = pointer(fmt+1, str, end, va_arg(args, void *),
1382 spec);
1383 while (isalnum(*fmt))
1384 fmt++;
1385 break;
1386
1387 case FORMAT_TYPE_PERCENT_CHAR:
1388 if (str < end)
1389 *str = '%';
1390 ++str;
1391 break;
1392
1393 case FORMAT_TYPE_INVALID:
1394 if (str < end)
1395 *str = '%';
1396 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001397 break;
1398
1399 case FORMAT_TYPE_NRCHARS: {
Joe Perchesef0658f2010-03-06 17:10:14 -08001400 u8 qualifier = spec.qualifier;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001401
1402 if (qualifier == 'l') {
1403 long *ip = va_arg(args, long *);
1404 *ip = (str - buf);
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001405 } else if (TOLOWER(qualifier) == 'z') {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001406 size_t *ip = va_arg(args, size_t *);
1407 *ip = (str - buf);
1408 } else {
1409 int *ip = va_arg(args, int *);
1410 *ip = (str - buf);
1411 }
1412 break;
1413 }
1414
1415 default:
1416 switch (spec.type) {
1417 case FORMAT_TYPE_LONG_LONG:
1418 num = va_arg(args, long long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001420 case FORMAT_TYPE_ULONG:
1421 num = va_arg(args, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001423 case FORMAT_TYPE_LONG:
1424 num = va_arg(args, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001426 case FORMAT_TYPE_SIZE_T:
1427 num = va_arg(args, size_t);
1428 break;
1429 case FORMAT_TYPE_PTRDIFF:
1430 num = va_arg(args, ptrdiff_t);
1431 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001432 case FORMAT_TYPE_UBYTE:
1433 num = (unsigned char) va_arg(args, int);
1434 break;
1435 case FORMAT_TYPE_BYTE:
1436 num = (signed char) va_arg(args, int);
1437 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001438 case FORMAT_TYPE_USHORT:
1439 num = (unsigned short) va_arg(args, int);
1440 break;
1441 case FORMAT_TYPE_SHORT:
1442 num = (short) va_arg(args, int);
1443 break;
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001444 case FORMAT_TYPE_INT:
1445 num = (int) va_arg(args, int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001446 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001448 num = va_arg(args, unsigned int);
1449 }
1450
1451 str = number(str, end, num, spec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001454
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001455 if (size > 0) {
1456 if (str < end)
1457 *str = '\0';
1458 else
Linus Torvalds0a6047e2006-06-28 17:09:34 -07001459 end[-1] = '\0';
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001460 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001461
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001462 /* the trailing null byte doesn't count towards the total */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 return str-buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466EXPORT_SYMBOL(vsnprintf);
1467
1468/**
1469 * vscnprintf - Format a string and place it in a buffer
1470 * @buf: The buffer to place the result into
1471 * @size: The size of the buffer, including the trailing null space
1472 * @fmt: The format string to use
1473 * @args: Arguments for the format string
1474 *
1475 * The return value is the number of characters which have been written into
Anton Arapovb921c692011-01-12 16:59:49 -08001476 * the @buf not including the trailing '\0'. If @size is == 0 the function
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 * returns 0.
1478 *
1479 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001480 * You probably want scnprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001481 *
1482 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 */
1484int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1485{
1486 int i;
1487
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001488 i = vsnprintf(buf, size, fmt, args);
1489
Anton Arapovb921c692011-01-12 16:59:49 -08001490 if (likely(i < size))
1491 return i;
1492 if (size != 0)
1493 return size - 1;
1494 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496EXPORT_SYMBOL(vscnprintf);
1497
1498/**
1499 * snprintf - Format a string and place it in a buffer
1500 * @buf: The buffer to place the result into
1501 * @size: The size of the buffer, including the trailing null space
1502 * @fmt: The format string to use
1503 * @...: Arguments for the format string
1504 *
1505 * The return value is the number of characters which would be
1506 * generated for the given input, excluding the trailing null,
1507 * as per ISO C99. If the return is greater than or equal to
1508 * @size, the resulting string is truncated.
Andi Kleen20036fd2008-10-15 22:02:02 -07001509 *
1510 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001512int snprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513{
1514 va_list args;
1515 int i;
1516
1517 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001518 i = vsnprintf(buf, size, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 return i;
1522}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523EXPORT_SYMBOL(snprintf);
1524
1525/**
1526 * scnprintf - Format a string and place it in a buffer
1527 * @buf: The buffer to place the result into
1528 * @size: The size of the buffer, including the trailing null space
1529 * @fmt: The format string to use
1530 * @...: Arguments for the format string
1531 *
1532 * The return value is the number of characters written into @buf not including
Changli Gaob903c0b2010-10-26 14:22:50 -07001533 * the trailing '\0'. If @size is == 0 the function returns 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 */
1535
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001536int scnprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537{
1538 va_list args;
1539 int i;
1540
1541 va_start(args, fmt);
Anton Arapovb921c692011-01-12 16:59:49 -08001542 i = vscnprintf(buf, size, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001544
Anton Arapovb921c692011-01-12 16:59:49 -08001545 return i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546}
1547EXPORT_SYMBOL(scnprintf);
1548
1549/**
1550 * vsprintf - Format a string and place it in a buffer
1551 * @buf: The buffer to place the result into
1552 * @fmt: The format string to use
1553 * @args: Arguments for the format string
1554 *
1555 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001556 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 * buffer overflows.
1558 *
1559 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001560 * You probably want sprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001561 *
1562 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 */
1564int vsprintf(char *buf, const char *fmt, va_list args)
1565{
1566 return vsnprintf(buf, INT_MAX, fmt, args);
1567}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568EXPORT_SYMBOL(vsprintf);
1569
1570/**
1571 * sprintf - Format a string and place it in a buffer
1572 * @buf: The buffer to place the result into
1573 * @fmt: The format string to use
1574 * @...: Arguments for the format string
1575 *
1576 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001577 * into @buf. Use snprintf() or scnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 * buffer overflows.
Andi Kleen20036fd2008-10-15 22:02:02 -07001579 *
1580 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001582int sprintf(char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583{
1584 va_list args;
1585 int i;
1586
1587 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001588 i = vsnprintf(buf, INT_MAX, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001590
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 return i;
1592}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593EXPORT_SYMBOL(sprintf);
1594
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001595#ifdef CONFIG_BINARY_PRINTF
1596/*
1597 * bprintf service:
1598 * vbin_printf() - VA arguments to binary data
1599 * bstr_printf() - Binary data to text string
1600 */
1601
1602/**
1603 * vbin_printf - Parse a format string and place args' binary value in a buffer
1604 * @bin_buf: The buffer to place args' binary value
1605 * @size: The size of the buffer(by words(32bits), not characters)
1606 * @fmt: The format string to use
1607 * @args: Arguments for the format string
1608 *
1609 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1610 * is skiped.
1611 *
1612 * The return value is the number of words(32bits) which would be generated for
1613 * the given input.
1614 *
1615 * NOTE:
1616 * If the return value is greater than @size, the resulting bin_buf is NOT
1617 * valid for bstr_printf().
1618 */
1619int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1620{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001621 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001622 char *str, *end;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001623
1624 str = (char *)bin_buf;
1625 end = (char *)(bin_buf + size);
1626
1627#define save_arg(type) \
1628do { \
1629 if (sizeof(type) == 8) { \
1630 unsigned long long value; \
1631 str = PTR_ALIGN(str, sizeof(u32)); \
1632 value = va_arg(args, unsigned long long); \
1633 if (str + sizeof(type) <= end) { \
1634 *(u32 *)str = *(u32 *)&value; \
1635 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1636 } \
1637 } else { \
1638 unsigned long value; \
1639 str = PTR_ALIGN(str, sizeof(type)); \
1640 value = va_arg(args, int); \
1641 if (str + sizeof(type) <= end) \
1642 *(typeof(type) *)str = (type)value; \
1643 } \
1644 str += sizeof(type); \
1645} while (0)
1646
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001647 while (*fmt) {
André Goddard Rosad4be1512009-12-14 18:00:59 -08001648 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001649
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001650 fmt += read;
1651
1652 switch (spec.type) {
1653 case FORMAT_TYPE_NONE:
André Goddard Rosad4be1512009-12-14 18:00:59 -08001654 case FORMAT_TYPE_INVALID:
1655 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001656 break;
1657
Vegard Nossumed681a92009-03-14 12:08:50 +01001658 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001659 case FORMAT_TYPE_PRECISION:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001660 save_arg(int);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001661 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001662
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001663 case FORMAT_TYPE_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001664 save_arg(char);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001665 break;
1666
1667 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001668 const char *save_str = va_arg(args, char *);
1669 size_t len;
André Goddard Rosa6c356632009-12-14 18:00:56 -08001670
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001671 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1672 || (unsigned long)save_str < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -08001673 save_str = "(null)";
André Goddard Rosa6c356632009-12-14 18:00:56 -08001674 len = strlen(save_str) + 1;
1675 if (str + len < end)
1676 memcpy(str, save_str, len);
1677 str += len;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001678 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001679 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001680
1681 case FORMAT_TYPE_PTR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001682 save_arg(void *);
1683 /* skip all alphanumeric pointer suffixes */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001684 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001685 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001686 break;
1687
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001688 case FORMAT_TYPE_NRCHARS: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001689 /* skip %n 's argument */
Joe Perchesef0658f2010-03-06 17:10:14 -08001690 u8 qualifier = spec.qualifier;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001691 void *skip_arg;
1692 if (qualifier == 'l')
1693 skip_arg = va_arg(args, long *);
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001694 else if (TOLOWER(qualifier) == 'z')
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001695 skip_arg = va_arg(args, size_t *);
1696 else
1697 skip_arg = va_arg(args, int *);
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001698 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001699 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001700
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001701 default:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001702 switch (spec.type) {
1703
1704 case FORMAT_TYPE_LONG_LONG:
1705 save_arg(long long);
1706 break;
1707 case FORMAT_TYPE_ULONG:
1708 case FORMAT_TYPE_LONG:
1709 save_arg(unsigned long);
1710 break;
1711 case FORMAT_TYPE_SIZE_T:
1712 save_arg(size_t);
1713 break;
1714 case FORMAT_TYPE_PTRDIFF:
1715 save_arg(ptrdiff_t);
1716 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001717 case FORMAT_TYPE_UBYTE:
1718 case FORMAT_TYPE_BYTE:
1719 save_arg(char);
1720 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001721 case FORMAT_TYPE_USHORT:
1722 case FORMAT_TYPE_SHORT:
1723 save_arg(short);
1724 break;
1725 default:
1726 save_arg(int);
1727 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001728 }
1729 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001730
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001731 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001732#undef save_arg
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001733}
1734EXPORT_SYMBOL_GPL(vbin_printf);
1735
1736/**
1737 * bstr_printf - Format a string from binary arguments and place it in a buffer
1738 * @buf: The buffer to place the result into
1739 * @size: The size of the buffer, including the trailing null space
1740 * @fmt: The format string to use
1741 * @bin_buf: Binary arguments for the format string
1742 *
1743 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1744 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1745 * a binary buffer that generated by vbin_printf.
1746 *
1747 * The format follows C99 vsnprintf, but has some extensions:
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001748 * see vsnprintf comment for details.
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001749 *
1750 * The return value is the number of characters which would
1751 * be generated for the given input, excluding the trailing
1752 * '\0', as per ISO C99. If you want to have the exact
1753 * number of characters written into @buf as return value
1754 * (not including the trailing '\0'), use vscnprintf(). If the
1755 * return is greater than or equal to @size, the resulting
1756 * string is truncated.
1757 */
1758int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1759{
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001760 struct printf_spec spec = {0};
André Goddard Rosad4be1512009-12-14 18:00:59 -08001761 char *str, *end;
1762 const char *args = (const char *)bin_buf;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001763
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001764 if (WARN_ON_ONCE((int) size < 0))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001765 return 0;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001766
1767 str = buf;
1768 end = buf + size;
1769
1770#define get_arg(type) \
1771({ \
1772 typeof(type) value; \
1773 if (sizeof(type) == 8) { \
1774 args = PTR_ALIGN(args, sizeof(u32)); \
1775 *(u32 *)&value = *(u32 *)args; \
1776 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1777 } else { \
1778 args = PTR_ALIGN(args, sizeof(type)); \
1779 value = *(typeof(type) *)args; \
1780 } \
1781 args += sizeof(type); \
1782 value; \
1783})
1784
1785 /* Make sure end is always >= buf */
1786 if (end < buf) {
1787 end = ((void *)-1);
1788 size = end - buf;
1789 }
1790
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001791 while (*fmt) {
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001792 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001793 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001794
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001795 fmt += read;
1796
1797 switch (spec.type) {
1798 case FORMAT_TYPE_NONE: {
1799 int copy = read;
1800 if (str < end) {
1801 if (copy > end - str)
1802 copy = end - str;
1803 memcpy(str, old_fmt, copy);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001804 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001805 str += read;
1806 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001807 }
1808
Vegard Nossumed681a92009-03-14 12:08:50 +01001809 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001810 spec.field_width = get_arg(int);
1811 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001812
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001813 case FORMAT_TYPE_PRECISION:
1814 spec.precision = get_arg(int);
1815 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001816
André Goddard Rosad4be1512009-12-14 18:00:59 -08001817 case FORMAT_TYPE_CHAR: {
1818 char c;
1819
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001820 if (!(spec.flags & LEFT)) {
1821 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001822 if (str < end)
1823 *str = ' ';
1824 ++str;
1825 }
1826 }
1827 c = (unsigned char) get_arg(char);
1828 if (str < end)
1829 *str = c;
1830 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001831 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001832 if (str < end)
1833 *str = ' ';
1834 ++str;
1835 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001836 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001837 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001838
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001839 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001840 const char *str_arg = args;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001841 args += strlen(str_arg) + 1;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001842 str = string(str, end, (char *)str_arg, spec);
1843 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001844 }
1845
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001846 case FORMAT_TYPE_PTR:
1847 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1848 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001849 fmt++;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001850 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001851
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001852 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001853 case FORMAT_TYPE_INVALID:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001854 if (str < end)
1855 *str = '%';
1856 ++str;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001857 break;
1858
1859 case FORMAT_TYPE_NRCHARS:
1860 /* skip */
1861 break;
1862
André Goddard Rosad4be1512009-12-14 18:00:59 -08001863 default: {
1864 unsigned long long num;
1865
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001866 switch (spec.type) {
1867
1868 case FORMAT_TYPE_LONG_LONG:
1869 num = get_arg(long long);
1870 break;
1871 case FORMAT_TYPE_ULONG:
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001872 case FORMAT_TYPE_LONG:
1873 num = get_arg(unsigned long);
1874 break;
1875 case FORMAT_TYPE_SIZE_T:
1876 num = get_arg(size_t);
1877 break;
1878 case FORMAT_TYPE_PTRDIFF:
1879 num = get_arg(ptrdiff_t);
1880 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001881 case FORMAT_TYPE_UBYTE:
1882 num = get_arg(unsigned char);
1883 break;
1884 case FORMAT_TYPE_BYTE:
1885 num = get_arg(signed char);
1886 break;
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001887 case FORMAT_TYPE_USHORT:
1888 num = get_arg(unsigned short);
1889 break;
1890 case FORMAT_TYPE_SHORT:
1891 num = get_arg(short);
1892 break;
1893 case FORMAT_TYPE_UINT:
1894 num = get_arg(unsigned int);
1895 break;
1896 default:
1897 num = get_arg(int);
1898 }
1899
1900 str = number(str, end, num, spec);
André Goddard Rosad4be1512009-12-14 18:00:59 -08001901 } /* default: */
1902 } /* switch(spec.type) */
1903 } /* while(*fmt) */
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001904
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001905 if (size > 0) {
1906 if (str < end)
1907 *str = '\0';
1908 else
1909 end[-1] = '\0';
1910 }
Frederic Weisbeckerfef20d92009-03-06 17:21:50 +01001911
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001912#undef get_arg
1913
1914 /* the trailing null byte doesn't count towards the total */
1915 return str - buf;
1916}
1917EXPORT_SYMBOL_GPL(bstr_printf);
1918
1919/**
1920 * bprintf - Parse a format string and place args' binary value in a buffer
1921 * @bin_buf: The buffer to place args' binary value
1922 * @size: The size of the buffer(by words(32bits), not characters)
1923 * @fmt: The format string to use
1924 * @...: Arguments for the format string
1925 *
1926 * The function returns the number of words(u32) written
1927 * into @bin_buf.
1928 */
1929int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1930{
1931 va_list args;
1932 int ret;
1933
1934 va_start(args, fmt);
1935 ret = vbin_printf(bin_buf, size, fmt, args);
1936 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001937
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001938 return ret;
1939}
1940EXPORT_SYMBOL_GPL(bprintf);
1941
1942#endif /* CONFIG_BINARY_PRINTF */
1943
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944/**
1945 * vsscanf - Unformat a buffer into a list of arguments
1946 * @buf: input buffer
1947 * @fmt: format of buffer
1948 * @args: arguments
1949 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001950int vsscanf(const char *buf, const char *fmt, va_list args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951{
1952 const char *str = buf;
1953 char *next;
1954 char digit;
1955 int num = 0;
Joe Perchesef0658f2010-03-06 17:10:14 -08001956 u8 qualifier;
1957 u8 base;
1958 s16 field_width;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001959 bool is_sign;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001961 while (*fmt && *str) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 /* skip any white space in format */
1963 /* white space in format matchs any amount of
1964 * white space, including none, in the input.
1965 */
1966 if (isspace(*fmt)) {
André Goddard Rosae7d28602009-12-14 18:01:06 -08001967 fmt = skip_spaces(++fmt);
1968 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 }
1970
1971 /* anything that is not a conversion must match exactly */
1972 if (*fmt != '%' && *fmt) {
1973 if (*fmt++ != *str++)
1974 break;
1975 continue;
1976 }
1977
1978 if (!*fmt)
1979 break;
1980 ++fmt;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001981
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 /* skip this conversion.
1983 * advance both strings to next white space
1984 */
1985 if (*fmt == '*') {
Andy Spencer8fccae22009-10-01 15:44:27 -07001986 while (!isspace(*fmt) && *fmt != '%' && *fmt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 fmt++;
1988 while (!isspace(*str) && *str)
1989 str++;
1990 continue;
1991 }
1992
1993 /* get field width */
1994 field_width = -1;
1995 if (isdigit(*fmt))
1996 field_width = skip_atoi(&fmt);
1997
1998 /* get conversion qualifier */
1999 qualifier = -1;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08002000 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
2001 TOLOWER(*fmt) == 'z') {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002 qualifier = *fmt++;
2003 if (unlikely(qualifier == *fmt)) {
2004 if (qualifier == 'h') {
2005 qualifier = 'H';
2006 fmt++;
2007 } else if (qualifier == 'l') {
2008 qualifier = 'L';
2009 fmt++;
2010 }
2011 }
2012 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
2014 if (!*fmt || !*str)
2015 break;
2016
André Goddard Rosad4be1512009-12-14 18:00:59 -08002017 base = 10;
2018 is_sign = 0;
2019
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002020 switch (*fmt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 case 'c':
2022 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002023 char *s = (char *)va_arg(args, char*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024 if (field_width == -1)
2025 field_width = 1;
2026 do {
2027 *s++ = *str++;
2028 } while (--field_width > 0 && *str);
2029 num++;
2030 }
2031 continue;
2032 case 's':
2033 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002034 char *s = (char *)va_arg(args, char *);
2035 if (field_width == -1)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -07002036 field_width = SHRT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037 /* first, skip leading white space in buffer */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002038 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039
2040 /* now copy until next white space */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002041 while (*str && !isspace(*str) && field_width--)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 *s++ = *str++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 *s = '\0';
2044 num++;
2045 }
2046 continue;
2047 case 'n':
2048 /* return number of characters read so far */
2049 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002050 int *i = (int *)va_arg(args, int*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 *i = str - buf;
2052 }
2053 continue;
2054 case 'o':
2055 base = 8;
2056 break;
2057 case 'x':
2058 case 'X':
2059 base = 16;
2060 break;
2061 case 'i':
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002062 base = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 case 'd':
2064 is_sign = 1;
2065 case 'u':
2066 break;
2067 case '%':
2068 /* looking for '%' in str */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002069 if (*str++ != '%')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 return num;
2071 continue;
2072 default:
2073 /* invalid format; stop here */
2074 return num;
2075 }
2076
2077 /* have some sort of integer conversion.
2078 * first, skip white space in buffer.
2079 */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002080 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081
2082 digit = *str;
2083 if (is_sign && digit == '-')
2084 digit = *(str + 1);
2085
2086 if (!digit
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002087 || (base == 16 && !isxdigit(digit))
2088 || (base == 10 && !isdigit(digit))
2089 || (base == 8 && (!isdigit(digit) || digit > '7'))
2090 || (base == 0 && !isdigit(digit)))
2091 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002093 switch (qualifier) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 case 'H': /* that's 'hh' in format */
2095 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002096 signed char *s = (signed char *)va_arg(args, signed char *);
2097 *s = (signed char)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002098 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002099 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2100 *s = (unsigned char)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101 }
2102 break;
2103 case 'h':
2104 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002105 short *s = (short *)va_arg(args, short *);
2106 *s = (short)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002108 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2109 *s = (unsigned short)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 }
2111 break;
2112 case 'l':
2113 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002114 long *l = (long *)va_arg(args, long *);
2115 *l = simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002117 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2118 *l = simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 }
2120 break;
2121 case 'L':
2122 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002123 long long *l = (long long *)va_arg(args, long long *);
2124 *l = simple_strtoll(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002126 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2127 *l = simple_strtoull(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128 }
2129 break;
2130 case 'Z':
2131 case 'z':
2132 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002133 size_t *s = (size_t *)va_arg(args, size_t *);
2134 *s = (size_t)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002135 }
2136 break;
2137 default:
2138 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002139 int *i = (int *)va_arg(args, int *);
2140 *i = (int)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002142 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2143 *i = (unsigned int)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 }
2145 break;
2146 }
2147 num++;
2148
2149 if (!next)
2150 break;
2151 str = next;
2152 }
Johannes Bergc6b40d12007-05-08 00:27:20 -07002153
2154 /*
2155 * Now we've come all the way through so either the input string or the
2156 * format ended. In the former case, there can be a %n at the current
2157 * position in the format that needs to be filled.
2158 */
2159 if (*fmt == '%' && *(fmt + 1) == 'n') {
2160 int *p = (int *)va_arg(args, int *);
2161 *p = str - buf;
2162 }
2163
Linus Torvalds1da177e2005-04-16 15:20:36 -07002164 return num;
2165}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166EXPORT_SYMBOL(vsscanf);
2167
2168/**
2169 * sscanf - Unformat a buffer into a list of arguments
2170 * @buf: input buffer
2171 * @fmt: formatting of buffer
2172 * @...: resulting arguments
2173 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002174int sscanf(const char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175{
2176 va_list args;
2177 int i;
2178
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002179 va_start(args, fmt);
2180 i = vsscanf(buf, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002182
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183 return i;
2184}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185EXPORT_SYMBOL(sscanf);