blob: 24112e5a5780608eed4855e1ceb3f18c7b371df9 [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}
121
Yi Yang06b2a762008-02-08 04:21:57 -0800122/**
123 * strict_strtoul - convert a string to an unsigned long strictly
124 * @cp: The string to be converted
125 * @base: The number base to use
126 * @res: The converted result value
127 *
128 * strict_strtoul converts a string to an unsigned long only if the
129 * string is really an unsigned long string, any string containing
130 * any invalid char at the tail will be rejected and -EINVAL is returned,
131 * only a newline char at the tail is acceptible because people generally
132 * change a module parameter in the following way:
133 *
134 * echo 1024 > /sys/module/e1000/parameters/copybreak
135 *
136 * echo will append a newline to the tail.
137 *
138 * It returns 0 if conversion is successful and *res is set to the converted
139 * value, otherwise it returns -EINVAL and *res is set to 0.
140 *
141 * simple_strtoul just ignores the successive invalid characters and
142 * return the converted value of prefix part of the string.
143 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700144int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
145{
146 char *tail;
147 unsigned long val;
148 size_t len;
149
150 *res = 0;
151 len = strlen(cp);
152 if (len == 0)
153 return -EINVAL;
154
155 val = simple_strtoul(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800156 if (tail == cp)
157 return -EINVAL;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800158
Harvey Harrison9d85db22008-10-16 13:40:35 -0700159 if ((*tail == '\0') ||
160 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
161 *res = val;
162 return 0;
163 }
164
165 return -EINVAL;
166}
167EXPORT_SYMBOL(strict_strtoul);
Yi Yang06b2a762008-02-08 04:21:57 -0800168
169/**
170 * strict_strtol - convert a string to a long strictly
171 * @cp: The string to be converted
172 * @base: The number base to use
173 * @res: The converted result value
174 *
175 * strict_strtol is similiar to strict_strtoul, but it allows the first
176 * character of a string is '-'.
177 *
178 * It returns 0 if conversion is successful and *res is set to the converted
179 * value, otherwise it returns -EINVAL and *res is set to 0.
180 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700181int strict_strtol(const char *cp, unsigned int base, long *res)
182{
183 int ret;
184 if (*cp == '-') {
185 ret = strict_strtoul(cp + 1, base, (unsigned long *)res);
186 if (!ret)
187 *res = -(*res);
188 } else {
189 ret = strict_strtoul(cp, base, (unsigned long *)res);
190 }
191
192 return ret;
193}
194EXPORT_SYMBOL(strict_strtol);
Yi Yang06b2a762008-02-08 04:21:57 -0800195
196/**
197 * strict_strtoull - convert a string to an unsigned long long strictly
198 * @cp: The string to be converted
199 * @base: The number base to use
200 * @res: The converted result value
201 *
202 * strict_strtoull converts a string to an unsigned long long only if the
203 * string is really an unsigned long long string, any string containing
204 * any invalid char at the tail will be rejected and -EINVAL is returned,
205 * only a newline char at the tail is acceptible because people generally
206 * change a module parameter in the following way:
207 *
208 * echo 1024 > /sys/module/e1000/parameters/copybreak
209 *
210 * echo will append a newline to the tail of the string.
211 *
212 * It returns 0 if conversion is successful and *res is set to the converted
213 * value, otherwise it returns -EINVAL and *res is set to 0.
214 *
215 * simple_strtoull just ignores the successive invalid characters and
216 * return the converted value of prefix part of the string.
217 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700218int strict_strtoull(const char *cp, unsigned int base, unsigned long long *res)
219{
220 char *tail;
221 unsigned long long val;
222 size_t len;
223
224 *res = 0;
225 len = strlen(cp);
226 if (len == 0)
227 return -EINVAL;
228
229 val = simple_strtoull(cp, &tail, base);
Pavel Macheke899aa82009-01-06 14:40:53 -0800230 if (tail == cp)
231 return -EINVAL;
Harvey Harrison9d85db22008-10-16 13:40:35 -0700232 if ((*tail == '\0') ||
233 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
234 *res = val;
235 return 0;
236 }
237
238 return -EINVAL;
239}
240EXPORT_SYMBOL(strict_strtoull);
Yi Yang06b2a762008-02-08 04:21:57 -0800241
242/**
243 * strict_strtoll - convert a string to a long long strictly
244 * @cp: The string to be converted
245 * @base: The number base to use
246 * @res: The converted result value
247 *
248 * strict_strtoll is similiar to strict_strtoull, but it allows the first
249 * character of a string is '-'.
250 *
251 * It returns 0 if conversion is successful and *res is set to the converted
252 * value, otherwise it returns -EINVAL and *res is set to 0.
253 */
Harvey Harrison9d85db22008-10-16 13:40:35 -0700254int strict_strtoll(const char *cp, unsigned int base, long long *res)
255{
256 int ret;
257 if (*cp == '-') {
258 ret = strict_strtoull(cp + 1, base, (unsigned long long *)res);
259 if (!ret)
260 *res = -(*res);
261 } else {
262 ret = strict_strtoull(cp, base, (unsigned long long *)res);
263 }
Yi Yang06b2a762008-02-08 04:21:57 -0800264
Harvey Harrison9d85db22008-10-16 13:40:35 -0700265 return ret;
266}
Yi Yang06b2a762008-02-08 04:21:57 -0800267EXPORT_SYMBOL(strict_strtoll);
Yi Yang06b2a762008-02-08 04:21:57 -0800268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269static int skip_atoi(const char **s)
270{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800271 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
273 while (isdigit(**s))
274 i = i*10 + *((*s)++) - '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return i;
277}
278
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700279/* Decimal conversion is by far the most typical, and is used
280 * for /proc and /sys data. This directly impacts e.g. top performance
281 * with many processes running. We optimize it for speed
282 * using code from
283 * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
284 * (with permission from the author, Douglas W. Jones). */
285
286/* Formats correctly any integer in [0,99999].
287 * Outputs from one to five digits depending on input.
288 * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800289static char *put_dec_trunc(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700290{
291 unsigned d3, d2, d1, d0;
292 d1 = (q>>4) & 0xf;
293 d2 = (q>>8) & 0xf;
294 d3 = (q>>12);
295
296 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
297 q = (d0 * 0xcd) >> 11;
298 d0 = d0 - 10*q;
299 *buf++ = d0 + '0'; /* least significant digit */
300 d1 = q + 9*d3 + 5*d2 + d1;
301 if (d1 != 0) {
302 q = (d1 * 0xcd) >> 11;
303 d1 = d1 - 10*q;
304 *buf++ = d1 + '0'; /* next digit */
305
306 d2 = q + 2*d2;
307 if ((d2 != 0) || (d3 != 0)) {
308 q = (d2 * 0xd) >> 7;
309 d2 = d2 - 10*q;
310 *buf++ = d2 + '0'; /* next digit */
311
312 d3 = q + 4*d3;
313 if (d3 != 0) {
314 q = (d3 * 0xcd) >> 11;
315 d3 = d3 - 10*q;
316 *buf++ = d3 + '0'; /* next digit */
317 if (q != 0)
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800318 *buf++ = q + '0'; /* most sign. digit */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700319 }
320 }
321 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800322
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700323 return buf;
324}
325/* Same with if's removed. Always emits five digits */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800326static char *put_dec_full(char *buf, unsigned q)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700327{
328 /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
329 /* but anyway, gcc produces better code with full-sized ints */
330 unsigned d3, d2, d1, d0;
331 d1 = (q>>4) & 0xf;
332 d2 = (q>>8) & 0xf;
333 d3 = (q>>12);
334
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800335 /*
336 * Possible ways to approx. divide by 10
337 * gcc -O2 replaces multiply with shifts and adds
338 * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
339 * (x * 0x67) >> 10: 1100111
340 * (x * 0x34) >> 9: 110100 - same
341 * (x * 0x1a) >> 8: 11010 - same
342 * (x * 0x0d) >> 7: 1101 - same, shortest code (on i386)
343 */
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700344 d0 = 6*(d3 + d2 + d1) + (q & 0xf);
345 q = (d0 * 0xcd) >> 11;
346 d0 = d0 - 10*q;
347 *buf++ = d0 + '0';
348 d1 = q + 9*d3 + 5*d2 + d1;
349 q = (d1 * 0xcd) >> 11;
350 d1 = d1 - 10*q;
351 *buf++ = d1 + '0';
352
353 d2 = q + 2*d2;
354 q = (d2 * 0xd) >> 7;
355 d2 = d2 - 10*q;
356 *buf++ = d2 + '0';
357
358 d3 = q + 4*d3;
359 q = (d3 * 0xcd) >> 11; /* - shorter code */
360 /* q = (d3 * 0x67) >> 10; - would also work */
361 d3 = d3 - 10*q;
362 *buf++ = d3 + '0';
363 *buf++ = q + '0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800364
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700365 return buf;
366}
367/* No inlining helps gcc to use registers better */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800368static noinline char *put_dec(char *buf, unsigned long long num)
Denis Vlasenko4277eed2007-07-15 23:41:56 -0700369{
370 while (1) {
371 unsigned rem;
372 if (num < 100000)
373 return put_dec_trunc(buf, num);
374 rem = do_div(num, 100000);
375 buf = put_dec_full(buf, rem);
376 }
377}
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379#define ZEROPAD 1 /* pad with zero */
380#define SIGN 2 /* unsigned/signed long */
381#define PLUS 4 /* show plus */
382#define SPACE 8 /* space if plus */
383#define LEFT 16 /* left justified */
Bjorn Helgaasb89dc5d2010-03-05 10:47:31 -0700384#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
385#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100387enum format_type {
388 FORMAT_TYPE_NONE, /* Just a string part */
Vegard Nossumed681a92009-03-14 12:08:50 +0100389 FORMAT_TYPE_WIDTH,
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100390 FORMAT_TYPE_PRECISION,
391 FORMAT_TYPE_CHAR,
392 FORMAT_TYPE_STR,
393 FORMAT_TYPE_PTR,
394 FORMAT_TYPE_PERCENT_CHAR,
395 FORMAT_TYPE_INVALID,
396 FORMAT_TYPE_LONG_LONG,
397 FORMAT_TYPE_ULONG,
398 FORMAT_TYPE_LONG,
Zhaoleia4e94ef2009-03-27 17:07:05 +0800399 FORMAT_TYPE_UBYTE,
400 FORMAT_TYPE_BYTE,
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100401 FORMAT_TYPE_USHORT,
402 FORMAT_TYPE_SHORT,
403 FORMAT_TYPE_UINT,
404 FORMAT_TYPE_INT,
405 FORMAT_TYPE_NRCHARS,
406 FORMAT_TYPE_SIZE_T,
407 FORMAT_TYPE_PTRDIFF
408};
409
410struct printf_spec {
Joe Perchesef0658f2010-03-06 17:10:14 -0800411 u16 type;
412 s16 field_width; /* width of output field */
413 u8 flags; /* flags to number() */
414 u8 base;
415 s8 precision; /* # of digits/chars */
416 u8 qualifier;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100417};
418
419static char *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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 17:21:50 +0100441 spec.field_width--;
442 } else if (spec.flags & PLUS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 sign = '+';
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100444 spec.field_width--;
445 } else if (spec.flags & SPACE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 sign = ' ';
Frederic Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 17:21:50 +0100480 if (i > spec.precision)
481 spec.precision = i;
Denis Vlasenkob39a7342007-07-15 23:41:54 -0700482 /* leading space padding */
Frederic Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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 Weisbeckerfef20d9c2009-03-06 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
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -0800539static char *string(char *buf, char *end, const char *s, struct printf_spec spec)
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700540{
541 int len, i;
542
543 if ((unsigned long)s < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -0800544 s = "(null)";
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700545
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100546 len = strnlen(s, spec.precision);
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700547
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100548 if (!(spec.flags & LEFT)) {
549 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700550 if (buf < end)
551 *buf = ' ';
552 ++buf;
553 }
554 }
555 for (i = 0; i < len; ++i) {
556 if (buf < end)
557 *buf = *s;
558 ++buf; ++s;
559 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100560 while (len < spec.field_width--) {
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700561 if (buf < end)
562 *buf = ' ';
563 ++buf;
564 }
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800565
Linus Torvalds0f9bfa52008-07-06 16:06:25 -0700566 return buf;
567}
568
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100569static char *symbol_string(char *buf, char *end, void *ptr,
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200570 struct printf_spec spec, char ext)
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700571{
572 unsigned long value = (unsigned long) ptr;
573#ifdef CONFIG_KALLSYMS
574 char sym[KSYM_SYMBOL_LEN];
Steven Rostedt91adcd22009-09-16 20:03:06 -0400575 if (ext != 'f' && ext != 's')
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200576 sprint_symbol(sym, value);
577 else
578 kallsyms_lookup(value, NULL, NULL, NULL, sym);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800579
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100580 return string(buf, end, sym, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700581#else
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800582 spec.field_width = 2 * sizeof(void *);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100583 spec.flags |= SPECIAL | SMALL | ZEROPAD;
584 spec.base = 16;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800585
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100586 return number(buf, end, value, spec);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700587#endif
588}
589
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100590static char *resource_string(char *buf, char *end, struct resource *res,
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600591 struct printf_spec spec, const char *fmt)
Linus Torvalds332d2e72008-10-20 15:07:34 +1100592{
593#ifndef IO_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600594#define IO_RSRC_PRINTK_SIZE 6
Linus Torvalds332d2e72008-10-20 15:07:34 +1100595#endif
596
597#ifndef MEM_RSRC_PRINTK_SIZE
Bjorn Helgaas28405372009-10-06 15:33:29 -0600598#define MEM_RSRC_PRINTK_SIZE 10
Linus Torvalds332d2e72008-10-20 15:07:34 +1100599#endif
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700600 static const struct printf_spec io_spec = {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100601 .base = 16,
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700602 .field_width = IO_RSRC_PRINTK_SIZE,
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100603 .precision = -1,
604 .flags = SPECIAL | SMALL | ZEROPAD,
605 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700606 static const struct printf_spec mem_spec = {
607 .base = 16,
608 .field_width = MEM_RSRC_PRINTK_SIZE,
609 .precision = -1,
610 .flags = SPECIAL | SMALL | ZEROPAD,
611 };
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700612 static const struct printf_spec bus_spec = {
613 .base = 16,
614 .field_width = 2,
615 .precision = -1,
616 .flags = SMALL | ZEROPAD,
617 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700618 static const struct printf_spec dec_spec = {
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600619 .base = 10,
620 .precision = -1,
621 .flags = 0,
622 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700623 static const struct printf_spec str_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600624 .field_width = -1,
625 .precision = 10,
626 .flags = LEFT,
627 };
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700628 static const struct printf_spec flag_spec = {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600629 .base = 16,
630 .precision = -1,
631 .flags = SPECIAL | SMALL,
632 };
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600633
634 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
635 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
636#define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
637#define FLAG_BUF_SIZE (2 * sizeof(res->flags))
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700638#define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600639#define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
640 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
641 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
642
Linus Torvalds332d2e72008-10-20 15:07:34 +1100643 char *p = sym, *pend = sym + sizeof(sym);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600644 int decode = (fmt[0] == 'R') ? 1 : 0;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700645 const struct printf_spec *specp;
Linus Torvalds332d2e72008-10-20 15:07:34 +1100646
647 *p++ = '[';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700648 if (res->flags & IORESOURCE_IO) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600649 p = string(p, pend, "io ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700650 specp = &io_spec;
651 } else if (res->flags & IORESOURCE_MEM) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600652 p = string(p, pend, "mem ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700653 specp = &mem_spec;
654 } else if (res->flags & IORESOURCE_IRQ) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600655 p = string(p, pend, "irq ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700656 specp = &dec_spec;
657 } else if (res->flags & IORESOURCE_DMA) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600658 p = string(p, pend, "dma ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700659 specp = &dec_spec;
Bjorn Helgaas0f4050c2010-03-05 10:47:42 -0700660 } else if (res->flags & IORESOURCE_BUS) {
661 p = string(p, pend, "bus ", str_spec);
662 specp = &bus_spec;
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700663 } else {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600664 p = string(p, pend, "??? ", str_spec);
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700665 specp = &mem_spec;
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600666 decode = 0;
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600667 }
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700668 p = number(p, pend, res->start, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600669 if (res->start != res->end) {
670 *p++ = '-';
Bjorn Helgaas4da0b662010-03-05 10:47:37 -0700671 p = number(p, pend, res->end, *specp);
Bjorn Helgaasc91d3372009-10-06 15:33:34 -0600672 }
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600673 if (decode) {
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600674 if (res->flags & IORESOURCE_MEM_64)
675 p = string(p, pend, " 64bit", str_spec);
676 if (res->flags & IORESOURCE_PREFETCH)
677 p = string(p, pend, " pref", str_spec);
Bjorn Helgaas9d7cca02010-03-05 10:47:47 -0700678 if (res->flags & IORESOURCE_WINDOW)
679 p = string(p, pend, " window", str_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600680 if (res->flags & IORESOURCE_DISABLED)
681 p = string(p, pend, " disabled", str_spec);
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600682 } else {
683 p = string(p, pend, " flags ", str_spec);
684 p = number(p, pend, res->flags, flag_spec);
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600685 }
Linus Torvalds332d2e72008-10-20 15:07:34 +1100686 *p++ = ']';
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600687 *p = '\0';
Linus Torvalds332d2e72008-10-20 15:07:34 +1100688
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100689 return string(buf, end, sym, spec);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100690}
691
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100692static char *mac_address_string(char *buf, char *end, u8 *addr,
Joe Perches8a27f7c2009-08-17 12:29:44 +0000693 struct printf_spec spec, const char *fmt)
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700694{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000695 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700696 char *p = mac_addr;
697 int i;
Joe Perchesbc7259a2010-01-07 11:43:50 +0000698 char separator;
699
700 if (fmt[1] == 'F') { /* FDDI canonical format */
Joe Perchesbc7259a2010-01-07 11:43:50 +0000701 separator = '-';
702 } else {
Joe Perchesbc7259a2010-01-07 11:43:50 +0000703 separator = ':';
704 }
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700705
706 for (i = 0; i < 6; i++) {
Joe Perchesc8e00062010-01-11 00:44:14 -0800707 p = pack_hex_byte(p, addr[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000708 if (fmt[0] == 'M' && i != 5)
Joe Perchesbc7259a2010-01-07 11:43:50 +0000709 *p++ = separator;
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700710 }
711 *p = '\0';
712
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100713 return string(buf, end, mac_addr, spec);
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700714}
715
Joe Perches0159f242010-01-13 20:23:30 -0800716static char *ip4_string(char *p, const u8 *addr, const char *fmt)
Harvey Harrison689afa72008-10-28 16:04:44 -0700717{
Harvey Harrison689afa72008-10-28 16:04:44 -0700718 int i;
Joe Perches0159f242010-01-13 20:23:30 -0800719 bool leading_zeros = (fmt[0] == 'i');
720 int index;
721 int step;
Harvey Harrison689afa72008-10-28 16:04:44 -0700722
Joe Perches0159f242010-01-13 20:23:30 -0800723 switch (fmt[2]) {
724 case 'h':
725#ifdef __BIG_ENDIAN
726 index = 0;
727 step = 1;
728#else
729 index = 3;
730 step = -1;
731#endif
732 break;
733 case 'l':
734 index = 3;
735 step = -1;
736 break;
737 case 'n':
738 case 'b':
739 default:
740 index = 0;
741 step = 1;
742 break;
743 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000744 for (i = 0; i < 4; i++) {
745 char temp[3]; /* hold each IP quad in reverse order */
Joe Perches0159f242010-01-13 20:23:30 -0800746 int digits = put_dec_trunc(temp, addr[index]) - temp;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000747 if (leading_zeros) {
748 if (digits < 3)
749 *p++ = '0';
750 if (digits < 2)
751 *p++ = '0';
752 }
753 /* reverse the digits in the quad */
754 while (digits--)
755 *p++ = temp[digits];
756 if (i < 3)
757 *p++ = '.';
Joe Perches0159f242010-01-13 20:23:30 -0800758 index += step;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000759 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000760 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800761
Joe Perches8a27f7c2009-08-17 12:29:44 +0000762 return p;
763}
764
Joe Percheseb78cd22009-09-18 13:04:06 +0000765static char *ip6_compressed_string(char *p, const char *addr)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000766{
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800767 int i, j, range;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000768 unsigned char zerolength[8];
769 int longest = 1;
770 int colonpos = -1;
771 u16 word;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800772 u8 hi, lo;
Joe Perches8a27f7c2009-08-17 12:29:44 +0000773 bool needcolon = false;
Joe Percheseb78cd22009-09-18 13:04:06 +0000774 bool useIPv4;
775 struct in6_addr in6;
776
777 memcpy(&in6, addr, sizeof(struct in6_addr));
778
779 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000780
781 memset(zerolength, 0, sizeof(zerolength));
782
783 if (useIPv4)
784 range = 6;
785 else
786 range = 8;
787
788 /* find position of longest 0 run */
789 for (i = 0; i < range; i++) {
790 for (j = i; j < range; j++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000791 if (in6.s6_addr16[j] != 0)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000792 break;
793 zerolength[i]++;
794 }
795 }
796 for (i = 0; i < range; i++) {
797 if (zerolength[i] > longest) {
798 longest = zerolength[i];
799 colonpos = i;
800 }
801 }
802
803 /* emit address */
804 for (i = 0; i < range; i++) {
805 if (i == colonpos) {
806 if (needcolon || i == 0)
807 *p++ = ':';
808 *p++ = ':';
809 needcolon = false;
810 i += longest - 1;
811 continue;
812 }
813 if (needcolon) {
814 *p++ = ':';
815 needcolon = false;
816 }
817 /* hex u16 without leading 0s */
Joe Percheseb78cd22009-09-18 13:04:06 +0000818 word = ntohs(in6.s6_addr16[i]);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000819 hi = word >> 8;
820 lo = word & 0xff;
821 if (hi) {
822 if (hi > 0x0f)
823 p = pack_hex_byte(p, hi);
824 else
825 *p++ = hex_asc_lo(hi);
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800826 p = pack_hex_byte(p, lo);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000827 }
André Goddard Rosab5ff9922009-12-14 18:00:59 -0800828 else if (lo > 0x0f)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000829 p = pack_hex_byte(p, lo);
830 else
831 *p++ = hex_asc_lo(lo);
832 needcolon = true;
833 }
834
835 if (useIPv4) {
836 if (needcolon)
837 *p++ = ':';
Joe Perches0159f242010-01-13 20:23:30 -0800838 p = ip4_string(p, &in6.s6_addr[12], "I4");
Joe Perches8a27f7c2009-08-17 12:29:44 +0000839 }
Joe Perches8a27f7c2009-08-17 12:29:44 +0000840 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800841
Joe Perches8a27f7c2009-08-17 12:29:44 +0000842 return p;
843}
844
Joe Percheseb78cd22009-09-18 13:04:06 +0000845static char *ip6_string(char *p, const char *addr, const char *fmt)
Joe Perches8a27f7c2009-08-17 12:29:44 +0000846{
847 int i;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800848
Harvey Harrison689afa72008-10-28 16:04:44 -0700849 for (i = 0; i < 8; i++) {
Joe Percheseb78cd22009-09-18 13:04:06 +0000850 p = pack_hex_byte(p, *addr++);
851 p = pack_hex_byte(p, *addr++);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000852 if (fmt[0] == 'I' && i != 7)
Harvey Harrison689afa72008-10-28 16:04:44 -0700853 *p++ = ':';
854 }
855 *p = '\0';
André Goddard Rosa7b9186f2009-12-14 18:00:57 -0800856
Joe Perches8a27f7c2009-08-17 12:29:44 +0000857 return p;
858}
859
860static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
861 struct printf_spec spec, const char *fmt)
862{
863 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
864
865 if (fmt[0] == 'I' && fmt[2] == 'c')
Joe Percheseb78cd22009-09-18 13:04:06 +0000866 ip6_compressed_string(ip6_addr, addr);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000867 else
Joe Percheseb78cd22009-09-18 13:04:06 +0000868 ip6_string(ip6_addr, addr, fmt);
Harvey Harrison689afa72008-10-28 16:04:44 -0700869
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100870 return string(buf, end, ip6_addr, spec);
Harvey Harrison689afa72008-10-28 16:04:44 -0700871}
872
Joe Perches8a27f7c2009-08-17 12:29:44 +0000873static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
874 struct printf_spec spec, const char *fmt)
Harvey Harrison4aa99602008-10-29 12:49:58 -0700875{
Joe Perches8a27f7c2009-08-17 12:29:44 +0000876 char ip4_addr[sizeof("255.255.255.255")];
Harvey Harrison4aa99602008-10-29 12:49:58 -0700877
Joe Perches0159f242010-01-13 20:23:30 -0800878 ip4_string(ip4_addr, addr, fmt);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700879
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100880 return string(buf, end, ip4_addr, spec);
Harvey Harrison4aa99602008-10-29 12:49:58 -0700881}
882
Joe Perches9ac6e442009-12-14 18:01:09 -0800883static char *uuid_string(char *buf, char *end, const u8 *addr,
884 struct printf_spec spec, const char *fmt)
885{
886 char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
887 char *p = uuid;
888 int i;
889 static const u8 be[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
890 static const u8 le[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
891 const u8 *index = be;
892 bool uc = false;
893
894 switch (*(++fmt)) {
895 case 'L':
896 uc = true; /* fall-through */
897 case 'l':
898 index = le;
899 break;
900 case 'B':
901 uc = true;
902 break;
903 }
904
905 for (i = 0; i < 16; i++) {
906 p = pack_hex_byte(p, addr[index[i]]);
907 switch (i) {
908 case 3:
909 case 5:
910 case 7:
911 case 9:
912 *p++ = '-';
913 break;
914 }
915 }
916
917 *p = 0;
918
919 if (uc) {
920 p = uuid;
921 do {
922 *p = toupper(*p);
923 } while (*(++p));
924 }
925
926 return string(buf, end, uuid, spec);
927}
928
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700929/*
930 * Show a '%p' thing. A kernel extension is that the '%p' is followed
931 * by an extra set of alphanumeric characters that are extended format
932 * specifiers.
933 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100934 * Right now we handle:
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700935 *
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200936 * - 'F' For symbolic function descriptor pointers with offset
937 * - 'f' For simple symbolic function names without offset
Steven Rostedt0efb4d22009-09-17 09:27:29 -0400938 * - 'S' For symbolic direct pointers with offset
939 * - 's' For symbolic direct pointers without offset
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600940 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
941 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
Harvey Harrisondd45c9c2008-10-27 15:47:12 -0700942 * - 'M' For a 6-byte MAC address, it prints the address in the
943 * usual colon-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000944 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
Joe Perchesbc7259a2010-01-07 11:43:50 +0000945 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
Joe Perchesc8e00062010-01-11 00:44:14 -0800946 * with a dash-separated hex notation
Joe Perches8a27f7c2009-08-17 12:29:44 +0000947 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
948 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
949 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
950 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
951 * IPv6 omits the colons (01020304...0f)
952 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
Joe Perches0159f242010-01-13 20:23:30 -0800953 * - '[Ii]4[hnbl]' IPv4 addresses in host, network, big or little endian order
Joe Perches8a27f7c2009-08-17 12:29:44 +0000954 * - 'I6c' for IPv6 addresses printed as specified by
Uwe Kleine-König3f472402010-01-08 14:43:02 -0800955 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
Joe Perches9ac6e442009-12-14 18:01:09 -0800956 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
957 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
958 * Options for %pU are:
959 * b big endian lower case hex (default)
960 * B big endian UPPER case hex
961 * l little endian lower case hex
962 * L little endian UPPER case hex
963 * big endian output byte order is:
964 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
965 * little endian output byte order is:
966 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
967 *
Linus Torvalds332d2e72008-10-20 15:07:34 +1100968 * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
969 * function pointers are really function descriptors, which contain a
970 * pointer to the real address.
Linus Torvalds4d8a7432008-07-06 16:24:57 -0700971 */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100972static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
973 struct printf_spec spec)
Linus Torvalds78a8bf62008-07-06 16:16:15 -0700974{
Linus Torvaldsd97106a2009-01-03 11:46:17 -0800975 if (!ptr)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +0100976 return string(buf, end, "(null)", spec);
Linus Torvaldsd97106a2009-01-03 11:46:17 -0800977
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700978 switch (*fmt) {
979 case 'F':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200980 case 'f':
Linus Torvalds0fe1ef22008-07-06 16:43:12 -0700981 ptr = dereference_function_descriptor(ptr);
982 /* Fallthrough */
983 case 'S':
Joe Perches9ac6e442009-12-14 18:01:09 -0800984 case 's':
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +0200985 return symbol_string(buf, end, ptr, spec, *fmt);
Linus Torvalds332d2e72008-10-20 15:07:34 +1100986 case 'R':
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600987 case 'r':
Bjorn Helgaasfd955412009-10-06 15:33:39 -0600988 return resource_string(buf, end, ptr, spec, fmt);
Joe Perches8a27f7c2009-08-17 12:29:44 +0000989 case 'M': /* Colon separated: 00:01:02:03:04:05 */
990 case 'm': /* Contiguous: 000102030405 */
Joe Perchesbc7259a2010-01-07 11:43:50 +0000991 /* [mM]F (FDDI, bit reversed) */
Joe Perches8a27f7c2009-08-17 12:29:44 +0000992 return mac_address_string(buf, end, ptr, spec, fmt);
993 case 'I': /* Formatted IP supported
994 * 4: 1.2.3.4
995 * 6: 0001:0203:...:0708
996 * 6c: 1::708 or 1::1.2.3.4
997 */
998 case 'i': /* Contiguous:
999 * 4: 001.002.003.004
1000 * 6: 000102...0f
1001 */
1002 switch (fmt[1]) {
1003 case '6':
1004 return ip6_addr_string(buf, end, ptr, spec, fmt);
1005 case '4':
1006 return ip4_addr_string(buf, end, ptr, spec, fmt);
1007 }
Harvey Harrison4aa99602008-10-29 12:49:58 -07001008 break;
Joe Perches9ac6e442009-12-14 18:01:09 -08001009 case 'U':
1010 return uuid_string(buf, end, ptr, spec, fmt);
Linus Torvalds0fe1ef22008-07-06 16:43:12 -07001011 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001012 spec.flags |= SMALL;
1013 if (spec.field_width == -1) {
1014 spec.field_width = 2*sizeof(void *);
1015 spec.flags |= ZEROPAD;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001016 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001017 spec.base = 16;
1018
1019 return number(buf, end, (unsigned long) ptr, spec);
1020}
1021
1022/*
1023 * Helper function to decode printf style format.
1024 * Each call decode a token from the format and return the
1025 * number of characters read (or likely the delta where it wants
1026 * to go on the next call).
1027 * The decoded token is returned through the parameters
1028 *
1029 * 'h', 'l', or 'L' for integer fields
1030 * 'z' support added 23/7/1999 S.H.
1031 * 'z' changed to 'Z' --davidm 1/25/99
1032 * 't' added for ptrdiff_t
1033 *
1034 * @fmt: the format string
1035 * @type of the token returned
1036 * @flags: various flags such as +, -, # tokens..
1037 * @field_width: overwritten width
1038 * @base: base of the number (octal, hex, ...)
1039 * @precision: precision of a number
1040 * @qualifier: qualifier of a number (long, size_t, ...)
1041 */
1042static int format_decode(const char *fmt, struct printf_spec *spec)
1043{
1044 const char *start = fmt;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001045
1046 /* we finished early by reading the field width */
Vegard Nossumed681a92009-03-14 12:08:50 +01001047 if (spec->type == FORMAT_TYPE_WIDTH) {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001048 if (spec->field_width < 0) {
1049 spec->field_width = -spec->field_width;
1050 spec->flags |= LEFT;
1051 }
1052 spec->type = FORMAT_TYPE_NONE;
1053 goto precision;
1054 }
1055
1056 /* we finished early by reading the precision */
1057 if (spec->type == FORMAT_TYPE_PRECISION) {
1058 if (spec->precision < 0)
1059 spec->precision = 0;
1060
1061 spec->type = FORMAT_TYPE_NONE;
1062 goto qualifier;
1063 }
1064
1065 /* By default */
1066 spec->type = FORMAT_TYPE_NONE;
1067
1068 for (; *fmt ; ++fmt) {
1069 if (*fmt == '%')
1070 break;
1071 }
1072
1073 /* Return the current non-format string */
1074 if (fmt != start || !*fmt)
1075 return fmt - start;
1076
1077 /* Process flags */
1078 spec->flags = 0;
1079
1080 while (1) { /* this also skips first '%' */
1081 bool found = true;
1082
1083 ++fmt;
1084
1085 switch (*fmt) {
1086 case '-': spec->flags |= LEFT; break;
1087 case '+': spec->flags |= PLUS; break;
1088 case ' ': spec->flags |= SPACE; break;
1089 case '#': spec->flags |= SPECIAL; break;
1090 case '0': spec->flags |= ZEROPAD; break;
1091 default: found = false;
1092 }
1093
1094 if (!found)
1095 break;
1096 }
1097
1098 /* get field width */
1099 spec->field_width = -1;
1100
1101 if (isdigit(*fmt))
1102 spec->field_width = skip_atoi(&fmt);
1103 else if (*fmt == '*') {
1104 /* it's the next argument */
Vegard Nossumed681a92009-03-14 12:08:50 +01001105 spec->type = FORMAT_TYPE_WIDTH;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001106 return ++fmt - start;
1107 }
1108
1109precision:
1110 /* get the precision */
1111 spec->precision = -1;
1112 if (*fmt == '.') {
1113 ++fmt;
1114 if (isdigit(*fmt)) {
1115 spec->precision = skip_atoi(&fmt);
1116 if (spec->precision < 0)
1117 spec->precision = 0;
1118 } else if (*fmt == '*') {
1119 /* it's the next argument */
Vegard Nossumadf26f82009-03-14 12:08:50 +01001120 spec->type = FORMAT_TYPE_PRECISION;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001121 return ++fmt - start;
1122 }
1123 }
1124
1125qualifier:
1126 /* get the conversion qualifier */
1127 spec->qualifier = -1;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001128 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1129 TOLOWER(*fmt) == 'z' || *fmt == 't') {
Zhaoleia4e94ef2009-03-27 17:07:05 +08001130 spec->qualifier = *fmt++;
1131 if (unlikely(spec->qualifier == *fmt)) {
1132 if (spec->qualifier == 'l') {
1133 spec->qualifier = 'L';
1134 ++fmt;
1135 } else if (spec->qualifier == 'h') {
1136 spec->qualifier = 'H';
1137 ++fmt;
1138 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001139 }
1140 }
1141
1142 /* default base */
1143 spec->base = 10;
1144 switch (*fmt) {
1145 case 'c':
1146 spec->type = FORMAT_TYPE_CHAR;
1147 return ++fmt - start;
1148
1149 case 's':
1150 spec->type = FORMAT_TYPE_STR;
1151 return ++fmt - start;
1152
1153 case 'p':
1154 spec->type = FORMAT_TYPE_PTR;
1155 return fmt - start;
1156 /* skip alnum */
1157
1158 case 'n':
1159 spec->type = FORMAT_TYPE_NRCHARS;
1160 return ++fmt - start;
1161
1162 case '%':
1163 spec->type = FORMAT_TYPE_PERCENT_CHAR;
1164 return ++fmt - start;
1165
1166 /* integer number formats - set up the flags and "break" */
1167 case 'o':
1168 spec->base = 8;
1169 break;
1170
1171 case 'x':
1172 spec->flags |= SMALL;
1173
1174 case 'X':
1175 spec->base = 16;
1176 break;
1177
1178 case 'd':
1179 case 'i':
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001180 spec->flags |= SIGN;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001181 case 'u':
1182 break;
1183
1184 default:
1185 spec->type = FORMAT_TYPE_INVALID;
1186 return fmt - start;
1187 }
1188
1189 if (spec->qualifier == 'L')
1190 spec->type = FORMAT_TYPE_LONG_LONG;
1191 else if (spec->qualifier == 'l') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001192 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001193 spec->type = FORMAT_TYPE_LONG;
1194 else
1195 spec->type = FORMAT_TYPE_ULONG;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001196 } else if (TOLOWER(spec->qualifier) == 'z') {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001197 spec->type = FORMAT_TYPE_SIZE_T;
1198 } else if (spec->qualifier == 't') {
1199 spec->type = FORMAT_TYPE_PTRDIFF;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001200 } else if (spec->qualifier == 'H') {
1201 if (spec->flags & SIGN)
1202 spec->type = FORMAT_TYPE_BYTE;
1203 else
1204 spec->type = FORMAT_TYPE_UBYTE;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001205 } else if (spec->qualifier == 'h') {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001206 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001207 spec->type = FORMAT_TYPE_SHORT;
1208 else
1209 spec->type = FORMAT_TYPE_USHORT;
1210 } else {
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001211 if (spec->flags & SIGN)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001212 spec->type = FORMAT_TYPE_INT;
1213 else
1214 spec->type = FORMAT_TYPE_UINT;
1215 }
1216
1217 return ++fmt - start;
Linus Torvalds78a8bf62008-07-06 16:16:15 -07001218}
1219
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220/**
1221 * vsnprintf - Format a string and place it in a buffer
1222 * @buf: The buffer to place the result into
1223 * @size: The size of the buffer, including the trailing null space
1224 * @fmt: The format string to use
1225 * @args: Arguments for the format string
1226 *
Andi Kleen20036fd2008-10-15 22:02:02 -07001227 * This function follows C99 vsnprintf, but has some extensions:
Steven Rostedt91adcd22009-09-16 20:03:06 -04001228 * %pS output the name of a text symbol with offset
1229 * %ps output the name of a text symbol without offset
Frederic Weisbecker0c8b9462009-04-15 17:48:18 +02001230 * %pF output the name of a function pointer with its offset
1231 * %pf output the name of a function pointer without its offset
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001232 * %pR output the address range in a struct resource with decoded flags
1233 * %pr output the address range in a struct resource with raw flags
1234 * %pM output a 6-byte MAC address with colons
1235 * %pm output a 6-byte MAC address without colons
1236 * %pI4 print an IPv4 address without leading zeros
1237 * %pi4 print an IPv4 address with leading zeros
1238 * %pI6 print an IPv6 address with colons
1239 * %pi6 print an IPv6 address without colons
1240 * %pI6c print an IPv6 address as specified by
Uwe Kleine-König3f472402010-01-08 14:43:02 -08001241 * http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00
Uwe Kleine-König8a795032009-12-17 15:27:12 -08001242 * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
1243 * case.
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001244 * %n is ignored
Andi Kleen20036fd2008-10-15 22:02:02 -07001245 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 * The return value is the number of characters which would
1247 * be generated for the given input, excluding the trailing
1248 * '\0', as per ISO C99. If you want to have the exact
1249 * number of characters written into @buf as return value
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001250 * (not including the trailing '\0'), use vscnprintf(). If the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 * return is greater than or equal to @size, the resulting
1252 * string is truncated.
1253 *
1254 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001255 * You probably want snprintf() instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 */
1257int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
1258{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 unsigned long long num;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001260 char *str, *end;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001261 struct printf_spec spec = {0};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001263 /* Reject out-of-range values early. Large positive sizes are
1264 used for unknown buffer sizes. */
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001265 if (WARN_ON_ONCE((int) size < 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267
1268 str = buf;
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001269 end = buf + size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001271 /* Make sure end is always >= buf */
1272 if (end < buf) {
1273 end = ((void *)-1);
1274 size = end - buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 }
1276
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001277 while (*fmt) {
1278 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001279 int read = format_decode(fmt, &spec);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001280
1281 fmt += read;
1282
1283 switch (spec.type) {
1284 case FORMAT_TYPE_NONE: {
1285 int copy = read;
1286 if (str < end) {
1287 if (copy > end - str)
1288 copy = end - str;
1289 memcpy(str, old_fmt, copy);
1290 }
1291 str += read;
1292 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 }
1294
Vegard Nossumed681a92009-03-14 12:08:50 +01001295 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001296 spec.field_width = va_arg(args, int);
1297 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001299 case FORMAT_TYPE_PRECISION:
1300 spec.precision = va_arg(args, int);
1301 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302
André Goddard Rosad4be1512009-12-14 18:00:59 -08001303 case FORMAT_TYPE_CHAR: {
1304 char c;
1305
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001306 if (!(spec.flags & LEFT)) {
1307 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001308 if (str < end)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 *str = ' ';
1310 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001311
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001313 }
1314 c = (unsigned char) va_arg(args, int);
1315 if (str < end)
1316 *str = c;
1317 ++str;
1318 while (--spec.field_width > 0) {
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001319 if (str < end)
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001320 *str = ' ';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001322 }
1323 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001324 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001326 case FORMAT_TYPE_STR:
1327 str = string(str, end, va_arg(args, char *), spec);
1328 break;
1329
1330 case FORMAT_TYPE_PTR:
1331 str = pointer(fmt+1, str, end, va_arg(args, void *),
1332 spec);
1333 while (isalnum(*fmt))
1334 fmt++;
1335 break;
1336
1337 case FORMAT_TYPE_PERCENT_CHAR:
1338 if (str < end)
1339 *str = '%';
1340 ++str;
1341 break;
1342
1343 case FORMAT_TYPE_INVALID:
1344 if (str < end)
1345 *str = '%';
1346 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001347 break;
1348
1349 case FORMAT_TYPE_NRCHARS: {
Joe Perchesef0658f2010-03-06 17:10:14 -08001350 u8 qualifier = spec.qualifier;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001351
1352 if (qualifier == 'l') {
1353 long *ip = va_arg(args, long *);
1354 *ip = (str - buf);
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001355 } else if (TOLOWER(qualifier) == 'z') {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001356 size_t *ip = va_arg(args, size_t *);
1357 *ip = (str - buf);
1358 } else {
1359 int *ip = va_arg(args, int *);
1360 *ip = (str - buf);
1361 }
1362 break;
1363 }
1364
1365 default:
1366 switch (spec.type) {
1367 case FORMAT_TYPE_LONG_LONG:
1368 num = va_arg(args, long long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001370 case FORMAT_TYPE_ULONG:
1371 num = va_arg(args, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001373 case FORMAT_TYPE_LONG:
1374 num = va_arg(args, long);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001376 case FORMAT_TYPE_SIZE_T:
1377 num = va_arg(args, size_t);
1378 break;
1379 case FORMAT_TYPE_PTRDIFF:
1380 num = va_arg(args, ptrdiff_t);
1381 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001382 case FORMAT_TYPE_UBYTE:
1383 num = (unsigned char) va_arg(args, int);
1384 break;
1385 case FORMAT_TYPE_BYTE:
1386 num = (signed char) va_arg(args, int);
1387 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001388 case FORMAT_TYPE_USHORT:
1389 num = (unsigned short) va_arg(args, int);
1390 break;
1391 case FORMAT_TYPE_SHORT:
1392 num = (short) va_arg(args, int);
1393 break;
Frederic Weisbecker39e874f2009-03-09 21:15:04 +01001394 case FORMAT_TYPE_INT:
1395 num = (int) va_arg(args, int);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001396 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 default:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001398 num = va_arg(args, unsigned int);
1399 }
1400
1401 str = number(str, end, num, spec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001404
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001405 if (size > 0) {
1406 if (str < end)
1407 *str = '\0';
1408 else
Linus Torvalds0a6047e2006-06-28 17:09:34 -07001409 end[-1] = '\0';
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001410 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001411
Jeremy Fitzhardingef7969372006-06-25 05:49:17 -07001412 /* the trailing null byte doesn't count towards the total */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 return str-buf;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001414
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416EXPORT_SYMBOL(vsnprintf);
1417
1418/**
1419 * vscnprintf - Format a string and place it in a buffer
1420 * @buf: The buffer to place the result into
1421 * @size: The size of the buffer, including the trailing null space
1422 * @fmt: The format string to use
1423 * @args: Arguments for the format string
1424 *
1425 * The return value is the number of characters which have been written into
1426 * the @buf not including the trailing '\0'. If @size is <= 0 the function
1427 * returns 0.
1428 *
1429 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001430 * You probably want scnprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001431 *
1432 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 */
1434int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
1435{
1436 int i;
1437
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001438 i = vsnprintf(buf, size, fmt, args);
1439
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 return (i >= size) ? (size - 1) : i;
1441}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442EXPORT_SYMBOL(vscnprintf);
1443
1444/**
1445 * snprintf - Format a string and place it in a buffer
1446 * @buf: The buffer to place the result into
1447 * @size: The size of the buffer, including the trailing null space
1448 * @fmt: The format string to use
1449 * @...: Arguments for the format string
1450 *
1451 * The return value is the number of characters which would be
1452 * generated for the given input, excluding the trailing null,
1453 * as per ISO C99. If the return is greater than or equal to
1454 * @size, the resulting string is truncated.
Andi Kleen20036fd2008-10-15 22:02:02 -07001455 *
1456 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001458int snprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459{
1460 va_list args;
1461 int i;
1462
1463 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001464 i = vsnprintf(buf, size, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001466
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 return i;
1468}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469EXPORT_SYMBOL(snprintf);
1470
1471/**
1472 * scnprintf - Format a string and place it in a buffer
1473 * @buf: The buffer to place the result into
1474 * @size: The size of the buffer, including the trailing null space
1475 * @fmt: The format string to use
1476 * @...: Arguments for the format string
1477 *
1478 * The return value is the number of characters written into @buf not including
Martin Peschkeea6f3282007-02-12 00:51:56 -08001479 * the trailing '\0'. If @size is <= 0 the function returns 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 */
1481
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001482int scnprintf(char *buf, size_t size, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
1484 va_list args;
1485 int i;
1486
1487 va_start(args, fmt);
1488 i = vsnprintf(buf, size, fmt, args);
1489 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001490
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 return (i >= size) ? (size - 1) : i;
1492}
1493EXPORT_SYMBOL(scnprintf);
1494
1495/**
1496 * vsprintf - Format a string and place it in a buffer
1497 * @buf: The buffer to place the result into
1498 * @fmt: The format string to use
1499 * @args: Arguments for the format string
1500 *
1501 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001502 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 * buffer overflows.
1504 *
1505 * Call this function if you are already dealing with a va_list.
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001506 * You probably want sprintf() instead.
Andi Kleen20036fd2008-10-15 22:02:02 -07001507 *
1508 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 */
1510int vsprintf(char *buf, const char *fmt, va_list args)
1511{
1512 return vsnprintf(buf, INT_MAX, fmt, args);
1513}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514EXPORT_SYMBOL(vsprintf);
1515
1516/**
1517 * sprintf - Format a string and place it in a buffer
1518 * @buf: The buffer to place the result into
1519 * @fmt: The format string to use
1520 * @...: Arguments for the format string
1521 *
1522 * The function returns the number of characters written
Robert P. J. Day72fd4a32007-02-10 01:45:59 -08001523 * into @buf. Use snprintf() or scnprintf() in order to avoid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524 * buffer overflows.
Andi Kleen20036fd2008-10-15 22:02:02 -07001525 *
1526 * See the vsnprintf() documentation for format string extensions over C99.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001528int sprintf(char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529{
1530 va_list args;
1531 int i;
1532
1533 va_start(args, fmt);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001534 i = vsnprintf(buf, INT_MAX, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001536
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 return i;
1538}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539EXPORT_SYMBOL(sprintf);
1540
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001541#ifdef CONFIG_BINARY_PRINTF
1542/*
1543 * bprintf service:
1544 * vbin_printf() - VA arguments to binary data
1545 * bstr_printf() - Binary data to text string
1546 */
1547
1548/**
1549 * vbin_printf - Parse a format string and place args' binary value in a buffer
1550 * @bin_buf: The buffer to place args' binary value
1551 * @size: The size of the buffer(by words(32bits), not characters)
1552 * @fmt: The format string to use
1553 * @args: Arguments for the format string
1554 *
1555 * The format follows C99 vsnprintf, except %n is ignored, and its argument
1556 * is skiped.
1557 *
1558 * The return value is the number of words(32bits) which would be generated for
1559 * the given input.
1560 *
1561 * NOTE:
1562 * If the return value is greater than @size, the resulting bin_buf is NOT
1563 * valid for bstr_printf().
1564 */
1565int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
1566{
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001567 struct printf_spec spec = {0};
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001568 char *str, *end;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001569
1570 str = (char *)bin_buf;
1571 end = (char *)(bin_buf + size);
1572
1573#define save_arg(type) \
1574do { \
1575 if (sizeof(type) == 8) { \
1576 unsigned long long value; \
1577 str = PTR_ALIGN(str, sizeof(u32)); \
1578 value = va_arg(args, unsigned long long); \
1579 if (str + sizeof(type) <= end) { \
1580 *(u32 *)str = *(u32 *)&value; \
1581 *(u32 *)(str + 4) = *((u32 *)&value + 1); \
1582 } \
1583 } else { \
1584 unsigned long value; \
1585 str = PTR_ALIGN(str, sizeof(type)); \
1586 value = va_arg(args, int); \
1587 if (str + sizeof(type) <= end) \
1588 *(typeof(type) *)str = (type)value; \
1589 } \
1590 str += sizeof(type); \
1591} while (0)
1592
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001593 while (*fmt) {
André Goddard Rosad4be1512009-12-14 18:00:59 -08001594 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001595
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001596 fmt += read;
1597
1598 switch (spec.type) {
1599 case FORMAT_TYPE_NONE:
André Goddard Rosad4be1512009-12-14 18:00:59 -08001600 case FORMAT_TYPE_INVALID:
1601 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001602 break;
1603
Vegard Nossumed681a92009-03-14 12:08:50 +01001604 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001605 case FORMAT_TYPE_PRECISION:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001606 save_arg(int);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001607 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001608
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001609 case FORMAT_TYPE_CHAR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001610 save_arg(char);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001611 break;
1612
1613 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001614 const char *save_str = va_arg(args, char *);
1615 size_t len;
André Goddard Rosa6c356632009-12-14 18:00:56 -08001616
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001617 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
1618 || (unsigned long)save_str < PAGE_SIZE)
André Goddard Rosa0f4f81d2009-12-14 18:00:55 -08001619 save_str = "(null)";
André Goddard Rosa6c356632009-12-14 18:00:56 -08001620 len = strlen(save_str) + 1;
1621 if (str + len < end)
1622 memcpy(str, save_str, len);
1623 str += len;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001624 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001625 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001626
1627 case FORMAT_TYPE_PTR:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001628 save_arg(void *);
1629 /* skip all alphanumeric pointer suffixes */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001630 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001631 fmt++;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001632 break;
1633
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001634 case FORMAT_TYPE_NRCHARS: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001635 /* skip %n 's argument */
Joe Perchesef0658f2010-03-06 17:10:14 -08001636 u8 qualifier = spec.qualifier;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001637 void *skip_arg;
1638 if (qualifier == 'l')
1639 skip_arg = va_arg(args, long *);
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001640 else if (TOLOWER(qualifier) == 'z')
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001641 skip_arg = va_arg(args, size_t *);
1642 else
1643 skip_arg = va_arg(args, int *);
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001644 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001645 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001646
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001647 default:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001648 switch (spec.type) {
1649
1650 case FORMAT_TYPE_LONG_LONG:
1651 save_arg(long long);
1652 break;
1653 case FORMAT_TYPE_ULONG:
1654 case FORMAT_TYPE_LONG:
1655 save_arg(unsigned long);
1656 break;
1657 case FORMAT_TYPE_SIZE_T:
1658 save_arg(size_t);
1659 break;
1660 case FORMAT_TYPE_PTRDIFF:
1661 save_arg(ptrdiff_t);
1662 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001663 case FORMAT_TYPE_UBYTE:
1664 case FORMAT_TYPE_BYTE:
1665 save_arg(char);
1666 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001667 case FORMAT_TYPE_USHORT:
1668 case FORMAT_TYPE_SHORT:
1669 save_arg(short);
1670 break;
1671 default:
1672 save_arg(int);
1673 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001674 }
1675 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001676
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001677 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001678#undef save_arg
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001679}
1680EXPORT_SYMBOL_GPL(vbin_printf);
1681
1682/**
1683 * bstr_printf - Format a string from binary arguments and place it in a buffer
1684 * @buf: The buffer to place the result into
1685 * @size: The size of the buffer, including the trailing null space
1686 * @fmt: The format string to use
1687 * @bin_buf: Binary arguments for the format string
1688 *
1689 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
1690 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
1691 * a binary buffer that generated by vbin_printf.
1692 *
1693 * The format follows C99 vsnprintf, but has some extensions:
Steven Rostedt0efb4d22009-09-17 09:27:29 -04001694 * see vsnprintf comment for details.
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001695 *
1696 * The return value is the number of characters which would
1697 * be generated for the given input, excluding the trailing
1698 * '\0', as per ISO C99. If you want to have the exact
1699 * number of characters written into @buf as return value
1700 * (not including the trailing '\0'), use vscnprintf(). If the
1701 * return is greater than or equal to @size, the resulting
1702 * string is truncated.
1703 */
1704int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
1705{
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001706 struct printf_spec spec = {0};
André Goddard Rosad4be1512009-12-14 18:00:59 -08001707 char *str, *end;
1708 const char *args = (const char *)bin_buf;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001709
Marcin Slusarz2f30b1f92009-09-21 17:04:29 -07001710 if (WARN_ON_ONCE((int) size < 0))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001711 return 0;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001712
1713 str = buf;
1714 end = buf + size;
1715
1716#define get_arg(type) \
1717({ \
1718 typeof(type) value; \
1719 if (sizeof(type) == 8) { \
1720 args = PTR_ALIGN(args, sizeof(u32)); \
1721 *(u32 *)&value = *(u32 *)args; \
1722 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
1723 } else { \
1724 args = PTR_ALIGN(args, sizeof(type)); \
1725 value = *(typeof(type) *)args; \
1726 } \
1727 args += sizeof(type); \
1728 value; \
1729})
1730
1731 /* Make sure end is always >= buf */
1732 if (end < buf) {
1733 end = ((void *)-1);
1734 size = end - buf;
1735 }
1736
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001737 while (*fmt) {
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001738 const char *old_fmt = fmt;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001739 int read = format_decode(fmt, &spec);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001740
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001741 fmt += read;
1742
1743 switch (spec.type) {
1744 case FORMAT_TYPE_NONE: {
1745 int copy = read;
1746 if (str < end) {
1747 if (copy > end - str)
1748 copy = end - str;
1749 memcpy(str, old_fmt, copy);
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001750 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001751 str += read;
1752 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001753 }
1754
Vegard Nossumed681a92009-03-14 12:08:50 +01001755 case FORMAT_TYPE_WIDTH:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001756 spec.field_width = get_arg(int);
1757 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001758
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001759 case FORMAT_TYPE_PRECISION:
1760 spec.precision = get_arg(int);
1761 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001762
André Goddard Rosad4be1512009-12-14 18:00:59 -08001763 case FORMAT_TYPE_CHAR: {
1764 char c;
1765
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001766 if (!(spec.flags & LEFT)) {
1767 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001768 if (str < end)
1769 *str = ' ';
1770 ++str;
1771 }
1772 }
1773 c = (unsigned char) get_arg(char);
1774 if (str < end)
1775 *str = c;
1776 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001777 while (--spec.field_width > 0) {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001778 if (str < end)
1779 *str = ' ';
1780 ++str;
1781 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001782 break;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001783 }
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001784
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001785 case FORMAT_TYPE_STR: {
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001786 const char *str_arg = args;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001787 args += strlen(str_arg) + 1;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001788 str = string(str, end, (char *)str_arg, spec);
1789 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001790 }
1791
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001792 case FORMAT_TYPE_PTR:
1793 str = pointer(fmt+1, str, end, get_arg(void *), spec);
1794 while (isalnum(*fmt))
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001795 fmt++;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001796 break;
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001797
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001798 case FORMAT_TYPE_PERCENT_CHAR:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001799 case FORMAT_TYPE_INVALID:
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001800 if (str < end)
1801 *str = '%';
1802 ++str;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001803 break;
1804
1805 case FORMAT_TYPE_NRCHARS:
1806 /* skip */
1807 break;
1808
André Goddard Rosad4be1512009-12-14 18:00:59 -08001809 default: {
1810 unsigned long long num;
1811
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001812 switch (spec.type) {
1813
1814 case FORMAT_TYPE_LONG_LONG:
1815 num = get_arg(long long);
1816 break;
1817 case FORMAT_TYPE_ULONG:
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001818 case FORMAT_TYPE_LONG:
1819 num = get_arg(unsigned long);
1820 break;
1821 case FORMAT_TYPE_SIZE_T:
1822 num = get_arg(size_t);
1823 break;
1824 case FORMAT_TYPE_PTRDIFF:
1825 num = get_arg(ptrdiff_t);
1826 break;
Zhaoleia4e94ef2009-03-27 17:07:05 +08001827 case FORMAT_TYPE_UBYTE:
1828 num = get_arg(unsigned char);
1829 break;
1830 case FORMAT_TYPE_BYTE:
1831 num = get_arg(signed char);
1832 break;
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001833 case FORMAT_TYPE_USHORT:
1834 num = get_arg(unsigned short);
1835 break;
1836 case FORMAT_TYPE_SHORT:
1837 num = get_arg(short);
1838 break;
1839 case FORMAT_TYPE_UINT:
1840 num = get_arg(unsigned int);
1841 break;
1842 default:
1843 num = get_arg(int);
1844 }
1845
1846 str = number(str, end, num, spec);
André Goddard Rosad4be1512009-12-14 18:00:59 -08001847 } /* default: */
1848 } /* switch(spec.type) */
1849 } /* while(*fmt) */
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001850
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001851 if (size > 0) {
1852 if (str < end)
1853 *str = '\0';
1854 else
1855 end[-1] = '\0';
1856 }
Frederic Weisbeckerfef20d9c2009-03-06 17:21:50 +01001857
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001858#undef get_arg
1859
1860 /* the trailing null byte doesn't count towards the total */
1861 return str - buf;
1862}
1863EXPORT_SYMBOL_GPL(bstr_printf);
1864
1865/**
1866 * bprintf - Parse a format string and place args' binary value in a buffer
1867 * @bin_buf: The buffer to place args' binary value
1868 * @size: The size of the buffer(by words(32bits), not characters)
1869 * @fmt: The format string to use
1870 * @...: Arguments for the format string
1871 *
1872 * The function returns the number of words(u32) written
1873 * into @bin_buf.
1874 */
1875int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
1876{
1877 va_list args;
1878 int ret;
1879
1880 va_start(args, fmt);
1881 ret = vbin_printf(bin_buf, size, fmt, args);
1882 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001883
Lai Jiangshan4370aa42009-03-06 17:21:46 +01001884 return ret;
1885}
1886EXPORT_SYMBOL_GPL(bprintf);
1887
1888#endif /* CONFIG_BINARY_PRINTF */
1889
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890/**
1891 * vsscanf - Unformat a buffer into a list of arguments
1892 * @buf: input buffer
1893 * @fmt: format of buffer
1894 * @args: arguments
1895 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001896int vsscanf(const char *buf, const char *fmt, va_list args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897{
1898 const char *str = buf;
1899 char *next;
1900 char digit;
1901 int num = 0;
Joe Perchesef0658f2010-03-06 17:10:14 -08001902 u8 qualifier;
1903 u8 base;
1904 s16 field_width;
André Goddard Rosad4be1512009-12-14 18:00:59 -08001905 bool is_sign;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001907 while (*fmt && *str) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 /* skip any white space in format */
1909 /* white space in format matchs any amount of
1910 * white space, including none, in the input.
1911 */
1912 if (isspace(*fmt)) {
André Goddard Rosae7d28602009-12-14 18:01:06 -08001913 fmt = skip_spaces(++fmt);
1914 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 }
1916
1917 /* anything that is not a conversion must match exactly */
1918 if (*fmt != '%' && *fmt) {
1919 if (*fmt++ != *str++)
1920 break;
1921 continue;
1922 }
1923
1924 if (!*fmt)
1925 break;
1926 ++fmt;
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001927
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 /* skip this conversion.
1929 * advance both strings to next white space
1930 */
1931 if (*fmt == '*') {
Andy Spencer8fccae22009-10-01 15:44:27 -07001932 while (!isspace(*fmt) && *fmt != '%' && *fmt)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 fmt++;
1934 while (!isspace(*str) && *str)
1935 str++;
1936 continue;
1937 }
1938
1939 /* get field width */
1940 field_width = -1;
1941 if (isdigit(*fmt))
1942 field_width = skip_atoi(&fmt);
1943
1944 /* get conversion qualifier */
1945 qualifier = -1;
André Goddard Rosa08562cb2009-12-14 18:00:58 -08001946 if (*fmt == 'h' || TOLOWER(*fmt) == 'l' ||
1947 TOLOWER(*fmt) == 'z') {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 qualifier = *fmt++;
1949 if (unlikely(qualifier == *fmt)) {
1950 if (qualifier == 'h') {
1951 qualifier = 'H';
1952 fmt++;
1953 } else if (qualifier == 'l') {
1954 qualifier = 'L';
1955 fmt++;
1956 }
1957 }
1958 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959
1960 if (!*fmt || !*str)
1961 break;
1962
André Goddard Rosad4be1512009-12-14 18:00:59 -08001963 base = 10;
1964 is_sign = 0;
1965
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001966 switch (*fmt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 case 'c':
1968 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001969 char *s = (char *)va_arg(args, char*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970 if (field_width == -1)
1971 field_width = 1;
1972 do {
1973 *s++ = *str++;
1974 } while (--field_width > 0 && *str);
1975 num++;
1976 }
1977 continue;
1978 case 's':
1979 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001980 char *s = (char *)va_arg(args, char *);
1981 if (field_width == -1)
Joe Perchesef0658f2010-03-06 17:10:14 -08001982 field_width = SHORT_MAX;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 /* first, skip leading white space in buffer */
André Goddard Rosae7d28602009-12-14 18:01:06 -08001984 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985
1986 /* now copy until next white space */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001987 while (*str && !isspace(*str) && field_width--)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 *s++ = *str++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001989 *s = '\0';
1990 num++;
1991 }
1992 continue;
1993 case 'n':
1994 /* return number of characters read so far */
1995 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08001996 int *i = (int *)va_arg(args, int*);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 *i = str - buf;
1998 }
1999 continue;
2000 case 'o':
2001 base = 8;
2002 break;
2003 case 'x':
2004 case 'X':
2005 base = 16;
2006 break;
2007 case 'i':
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002008 base = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009 case 'd':
2010 is_sign = 1;
2011 case 'u':
2012 break;
2013 case '%':
2014 /* looking for '%' in str */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002015 if (*str++ != '%')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 return num;
2017 continue;
2018 default:
2019 /* invalid format; stop here */
2020 return num;
2021 }
2022
2023 /* have some sort of integer conversion.
2024 * first, skip white space in buffer.
2025 */
André Goddard Rosae7d28602009-12-14 18:01:06 -08002026 str = skip_spaces(str);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027
2028 digit = *str;
2029 if (is_sign && digit == '-')
2030 digit = *(str + 1);
2031
2032 if (!digit
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002033 || (base == 16 && !isxdigit(digit))
2034 || (base == 10 && !isdigit(digit))
2035 || (base == 8 && (!isdigit(digit) || digit > '7'))
2036 || (base == 0 && !isdigit(digit)))
2037 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002039 switch (qualifier) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 case 'H': /* that's 'hh' in format */
2041 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002042 signed char *s = (signed char *)va_arg(args, signed char *);
2043 *s = (signed char)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002045 unsigned char *s = (unsigned char *)va_arg(args, unsigned char *);
2046 *s = (unsigned char)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002047 }
2048 break;
2049 case 'h':
2050 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002051 short *s = (short *)va_arg(args, short *);
2052 *s = (short)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002053 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002054 unsigned short *s = (unsigned short *)va_arg(args, unsigned short *);
2055 *s = (unsigned short)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 }
2057 break;
2058 case 'l':
2059 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002060 long *l = (long *)va_arg(args, long *);
2061 *l = simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002063 unsigned long *l = (unsigned long *)va_arg(args, unsigned long *);
2064 *l = simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065 }
2066 break;
2067 case 'L':
2068 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002069 long long *l = (long long *)va_arg(args, long long *);
2070 *l = simple_strtoll(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002072 unsigned long long *l = (unsigned long long *)va_arg(args, unsigned long long *);
2073 *l = simple_strtoull(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074 }
2075 break;
2076 case 'Z':
2077 case 'z':
2078 {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002079 size_t *s = (size_t *)va_arg(args, size_t *);
2080 *s = (size_t)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 }
2082 break;
2083 default:
2084 if (is_sign) {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002085 int *i = (int *)va_arg(args, int *);
2086 *i = (int)simple_strtol(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087 } else {
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002088 unsigned int *i = (unsigned int *)va_arg(args, unsigned int*);
2089 *i = (unsigned int)simple_strtoul(str, &next, base);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 }
2091 break;
2092 }
2093 num++;
2094
2095 if (!next)
2096 break;
2097 str = next;
2098 }
Johannes Bergc6b40d12007-05-08 00:27:20 -07002099
2100 /*
2101 * Now we've come all the way through so either the input string or the
2102 * format ended. In the former case, there can be a %n at the current
2103 * position in the format that needs to be filled.
2104 */
2105 if (*fmt == '%' && *(fmt + 1) == 'n') {
2106 int *p = (int *)va_arg(args, int *);
2107 *p = str - buf;
2108 }
2109
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 return num;
2111}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112EXPORT_SYMBOL(vsscanf);
2113
2114/**
2115 * sscanf - Unformat a buffer into a list of arguments
2116 * @buf: input buffer
2117 * @fmt: formatting of buffer
2118 * @...: resulting arguments
2119 */
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002120int sscanf(const char *buf, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121{
2122 va_list args;
2123 int i;
2124
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002125 va_start(args, fmt);
2126 i = vsscanf(buf, fmt, args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127 va_end(args);
André Goddard Rosa7b9186f2009-12-14 18:00:57 -08002128
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 return i;
2130}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131EXPORT_SYMBOL(sscanf);