2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
3 * Copyright (c) 2007 Mans Rullgard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
34 int av_strstart(const char *str, const char *pfx, const char **ptr)
36 while (*pfx && *pfx == *str) {
45 int av_stristart(const char *str, const char *pfx, const char **ptr)
47 while (*pfx && av_toupper((unsigned)*pfx) == av_toupper((unsigned)*str)) {
56 char *av_stristr(const char *s1, const char *s2)
59 return (char*)(intptr_t)s1;
62 if (av_stristart(s1, s2, NULL))
63 return (char*)(intptr_t)s1;
69 char *av_strnstr(const char *haystack, const char *needle, size_t hay_length)
71 size_t needle_len = strlen(needle);
73 return (char*)haystack;
74 while (hay_length >= needle_len) {
76 if (!memcmp(haystack, needle, needle_len))
77 return (char*)haystack;
83 size_t av_strlcpy(char *dst, const char *src, size_t size)
86 while (++len < size && *src)
90 return len + strlen(src) - 1;
93 size_t av_strlcat(char *dst, const char *src, size_t size)
95 size_t len = strlen(dst);
97 return len + strlen(src);
98 return len + av_strlcpy(dst + len, src, size - len);
101 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
103 size_t len = strlen(dst);
107 len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
113 char *av_asprintf(const char *fmt, ...)
120 len = vsnprintf(NULL, 0, fmt, va);
125 p = av_malloc(len + 1);
130 len = vsnprintf(p, len + 1, fmt, va);
140 char *av_d2str(double d)
142 char *str = av_malloc(16);
144 snprintf(str, 16, "%f", d);
149 #define WHITESPACES " \n\t\r"
151 char *av_get_token(const char **buf, const char *term)
153 char *out = av_malloc(strlen(*buf) + 1);
154 char *ret = out, *end = out;
155 const char *p = *buf;
158 p += strspn(p, WHITESPACES);
160 while (*p && !strspn(p, term)) {
162 if (c == '\\' && *p) {
165 } else if (c == '\'') {
166 while (*p && *p != '\'')
179 while (out >= end && strspn(out, WHITESPACES));
186 char *av_strtok(char *s, const char *delim, char **saveptr)
190 if (!s && !(s = *saveptr))
193 /* skip leading delimiters */
194 s += strspn(s, delim);
196 /* s now points to the first non delimiter char, or to the end of the string */
203 /* skip non delimiters */
204 s += strcspn(s, delim);
215 int av_strcasecmp(const char *a, const char *b)
219 c1 = av_tolower(*a++);
220 c2 = av_tolower(*b++);
221 } while (c1 && c1 == c2);
225 int av_strncasecmp(const char *a, const char *b, size_t n)
231 c1 = av_tolower(*a++);
232 c2 = av_tolower(*b++);
233 } while (--n && c1 && c1 == c2);
237 char *av_strireplace(const char *str, const char *from, const char *to)
240 const char *pstr2, *pstr = str;
241 size_t tolen = strlen(to), fromlen = strlen(from);
244 av_bprint_init(&pbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
245 while ((pstr2 = av_stristr(pstr, from))) {
246 av_bprint_append_data(&pbuf, pstr, pstr2 - pstr);
247 pstr = pstr2 + fromlen;
248 av_bprint_append_data(&pbuf, to, tolen);
250 av_bprint_append_data(&pbuf, pstr, strlen(pstr));
251 if (!av_bprint_is_complete(&pbuf)) {
252 av_bprint_finalize(&pbuf, NULL);
254 av_bprint_finalize(&pbuf, &ret);
260 const char *av_basename(const char *path)
267 if (!path || *path == '\0')
270 p = strrchr(path, '/');
272 q = strrchr(path, '\\');
273 d = strchr(path, ':');
283 const char *av_dirname(char *path)
285 char *p = path ? strrchr(path, '/') : NULL;
288 char *q = path ? strrchr(path, '\\') : NULL;
289 char *d = path ? strchr(path, ':') : NULL;
304 char *av_append_path_component(const char *path, const char *component)
310 return av_strdup(component);
312 return av_strdup(path);
314 p_len = strlen(path);
315 c_len = strlen(component);
316 if (p_len > SIZE_MAX - c_len || p_len + c_len > SIZE_MAX - 2)
318 fullpath = av_malloc(p_len + c_len + 2);
321 av_strlcpy(fullpath, path, p_len + 1);
323 if (fullpath[p_len - 1] != '/' && component[0] != '/')
324 fullpath[p_len++] = '/';
325 else if (fullpath[p_len - 1] == '/' && component[0] == '/')
329 av_strlcpy(&fullpath[p_len], component, c_len + 1);
330 fullpath[p_len + c_len] = 0;
335 int av_escape(char **dst, const char *src, const char *special_chars,
336 enum AVEscapeMode mode, int flags)
340 av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
341 av_bprint_escape(&dstbuf, src, special_chars, mode, flags);
343 if (!av_bprint_is_complete(&dstbuf)) {
344 av_bprint_finalize(&dstbuf, NULL);
345 return AVERROR(ENOMEM);
347 av_bprint_finalize(&dstbuf, dst);
352 int av_match_name(const char *name, const char *names)
360 namelen = strlen(name);
362 int negate = '-' == *names;
363 p = strchr(names, ',');
365 p = names + strlen(names);
367 len = FFMAX(p - names, namelen);
368 if (!av_strncasecmp(name, names, len) || !strncmp("ALL", names, FFMAX(3, p - names)))
370 names = p + (*p == ',');
375 int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,
378 const uint8_t *p = *bufp;
381 int ret = 0, tail_len;
382 uint32_t overlong_encoding_mins[6] = {
383 0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,
391 /* first sequence byte starts with 10, or is 1111-1110 or 1111-1111,
392 which is not admitted */
393 if ((code & 0xc0) == 0x80 || code >= 0xFE) {
394 ret = AVERROR(EILSEQ);
397 top = (code & 128) >> 1;
405 return AVERROR(EILSEQ); /* incomplete sequence */
408 /* we assume the byte to be in the form 10xx-xxxx */
409 tmp = *p++ - 128; /* strip leading 1 */
412 return AVERROR(EILSEQ);
414 code = (code<<6) + tmp;
417 code &= (top << 1) - 1;
419 /* check for overlong encodings */
420 av_assert0(tail_len <= 5);
421 if (code < overlong_encoding_mins[tail_len]) {
422 ret = AVERROR(EILSEQ);
426 if (code >= 1U<<31) {
427 ret = AVERROR(EILSEQ); /* out-of-range value */
433 if (code > 0x10FFFF &&
434 !(flags & AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES))
435 ret = AVERROR(EILSEQ);
436 if (code < 0x20 && code != 0x9 && code != 0xA && code != 0xD &&
437 flags & AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES)
438 ret = AVERROR(EILSEQ);
439 if (code >= 0xD800 && code <= 0xDFFF &&
440 !(flags & AV_UTF8_FLAG_ACCEPT_SURROGATES))
441 ret = AVERROR(EILSEQ);
442 if ((code == 0xFFFE || code == 0xFFFF) &&
443 !(flags & AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS))
444 ret = AVERROR(EILSEQ);
451 int av_match_list(const char *name, const char *list, char separator)
455 for (p = name; p && *p; ) {
456 for (q = list; q && *q; ) {
458 for (k = 0; p[k] == q[k] || (p[k]*q[k] == 0 && p[k]+q[k] == separator); k++)
459 if (k && (!p[k] || p[k] == separator))
461 q = strchr(q, separator);
464 p = strchr(p, separator);