FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/avstring.c
Date: 2025-08-19 23:55:23
Exec Total Coverage
Lines: 206 248 83.1%
Functions: 19 20 95.0%
Branches: 153 208 73.6%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
3 * Copyright (c) 2007 Mans Rullgard
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include <limits.h>
23 #include <stdarg.h>
24 #include <stdint.h>
25 #include <stdio.h>
26 #include <string.h>
27
28 #include "config.h"
29 #include "mem.h"
30 #include "avassert.h"
31 #include "avstring.h"
32 #include "bprint.h"
33 #include "error.h"
34 #include "macros.h"
35
36 192429042 int av_strstart(const char *str, const char *pfx, const char **ptr)
37 {
38
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 211050140 while (*pfx && *pfx == *str) {
39 18621098 pfx++;
40 18621098 str++;
41 }
42
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 192429042 if (!*pfx && ptr)
43 1329386 *ptr = str;
44 192429042 return !*pfx;
45 }
46
47 10746 int av_stristart(const char *str, const char *pfx, const char **ptr)
48 {
49
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 11387 while (*pfx && av_toupper((unsigned)*pfx) == av_toupper((unsigned)*str)) {
50 641 pfx++;
51 641 str++;
52 }
53
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 10746 if (!*pfx && ptr)
54 4 *ptr = str;
55 10746 return !*pfx;
56 }
57
58 663 char *av_stristr(const char *s1, const char *s2)
59 {
60
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 663 if (!*s2)
61 ✗ return (char*)(intptr_t)s1;
62
63 do
64
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 10727 if (av_stristart(s1, s2, NULL))
65 181 return (char*)(intptr_t)s1;
66
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 10546 while (*s1++);
67
68 482 return NULL;
69 }
70
71 7 char *av_strnstr(const char *haystack, const char *needle, size_t hay_length)
72 {
73 7 size_t needle_len = strlen(needle);
74
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 7 if (!needle_len)
75 1 return (char*)haystack;
76
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 142 while (hay_length >= needle_len) {
77 141 hay_length--;
78
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 141 if (!memcmp(haystack, needle, needle_len))
79 5 return (char*)haystack;
80 136 haystack++;
81 }
82 1 return NULL;
83 }
84
85 392263 size_t av_strlcpy(char *dst, const char *src, size_t size)
86 {
87 392263 size_t len = 0;
88
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 2766854 while (++len < size && *src)
89 2374591 *dst++ = *src++;
90
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 392263 if (len <= size)
91 392263 *dst = 0;
92 392263 return len + strlen(src) - 1;
93 }
94
95 63673 size_t av_strlcat(char *dst, const char *src, size_t size)
96 {
97 63673 size_t len = strlen(dst);
98
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 63673 if (size <= len + 1)
99 ✗ return len + strlen(src);
100 63673 return len + av_strlcpy(dst + len, src, size - len);
101 }
102
103 148244 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
104 {
105 148244 size_t len = strlen(dst);
106 va_list vl;
107
108 148244 va_start(vl, fmt);
109
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 148244 len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
110 148244 va_end(vl);
111
112 148244 return len;
113 }
114
115 17049 char *av_asprintf(const char *fmt, ...)
116 {
117 17049 char *p = NULL;
118 va_list va;
119 int len;
120
121 17049 va_start(va, fmt);
122 17049 len = vsnprintf(NULL, 0, fmt, va);
123 17049 va_end(va);
124
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 17049 if (len < 0)
125 ✗ goto end;
126
127 17049 p = av_malloc(len + 1);
128
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 17049 if (!p)
129 ✗ goto end;
130
131 17049 va_start(va, fmt);
132 17049 len = vsnprintf(p, len + 1, fmt, va);
133 17049 va_end(va);
134
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 17049 if (len < 0)
135 ✗ av_freep(&p);
136
137 17049 end:
138 17049 return p;
139 }
140
141 #define WHITESPACES " \n\t\r"
142
143 121639 char *av_get_token(const char **buf, const char *term)
144 {
145 121639 char *out = av_realloc(NULL, strlen(*buf) + 1);
146 121639 char *ret = out, *end = out;
147 121639 const char *p = *buf;
148
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 121639 if (!out)
149 ✗ return NULL;
150 121639 p += strspn(p, WHITESPACES);
151
152
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 1281636 while (*p && !strspn(p, term)) {
153 1159997 char c = *p++;
154
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 1159997 if (c == '\\' && *p) {
155 158 *out++ = *p++;
156 158 end = out;
157
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 1159839 } else if (c == '\'') {
158
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 912 while (*p && *p != '\'')
159 864 *out++ = *p++;
160
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 48 if (*p) {
161 44 p++;
162 44 end = out;
163 }
164 } else {
165 1159791 *out++ = c;
166 }
167 }
168
169 do
170 122105 *out-- = 0;
171
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 122105 while (out >= end && strspn(out, WHITESPACES));
172
173 121639 *buf = p;
174
175 121639 char *small_ret = av_realloc(ret, out - ret + 2);
176
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 121639 return small_ret ? small_ret : ret;
177 }
178
179 10372 char *av_strtok(char *s, const char *delim, char **saveptr)
180 {
181 char *tok;
182
183
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 10372 if (!s && !(s = *saveptr))
184 455 return NULL;
185
186 /* skip leading delimiters */
187 9917 s += strspn(s, delim);
188
189 /* s now points to the first non delimiter char, or to the end of the string */
190
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 9917 if (!*s) {
191 24 *saveptr = NULL;
192 24 return NULL;
193 }
194 9893 tok = s++;
195
196 /* skip non delimiters */
197 9893 s += strcspn(s, delim);
198
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 9893 if (*s) {
199 8671 *s = 0;
200 8671 *saveptr = s+1;
201 } else {
202 1222 *saveptr = NULL;
203 }
204
205 9893 return tok;
206 }
207
208 596239 int av_strcasecmp(const char *a, const char *b)
209 {
210 uint8_t c1, c2;
211 do {
212 656924 c1 = av_tolower(*a++);
213 656924 c2 = av_tolower(*b++);
214
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 656924 } while (c1 && c1 == c2);
215 596239 return c1 - c2;
216 }
217
218 3532121 int av_strncasecmp(const char *a, const char *b, size_t n)
219 {
220 uint8_t c1, c2;
221
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 3532121 if (n <= 0)
222 ✗ return 0;
223 do {
224 3859045 c1 = av_tolower(*a++);
225 3859045 c2 = av_tolower(*b++);
226
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 3859045 } while (--n && c1 && c1 == c2);
227 3532121 return c1 - c2;
228 }
229
230 4 char *av_strireplace(const char *str, const char *from, const char *to)
231 {
232 4 char *ret = NULL;
233 4 const char *pstr2, *pstr = str;
234 4 size_t tolen = strlen(to), fromlen = strlen(from);
235 AVBPrint pbuf;
236
237 4 av_bprint_init(&pbuf, 1, AV_BPRINT_SIZE_UNLIMITED);
238
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 8 while ((pstr2 = av_stristr(pstr, from))) {
239 4 av_bprint_append_data(&pbuf, pstr, pstr2 - pstr);
240 4 pstr = pstr2 + fromlen;
241 4 av_bprint_append_data(&pbuf, to, tolen);
242 }
243 4 av_bprint_append_data(&pbuf, pstr, strlen(pstr));
244
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 4 if (!av_bprint_is_complete(&pbuf)) {
245 ✗ av_bprint_finalize(&pbuf, NULL);
246 } else {
247 4 av_bprint_finalize(&pbuf, &ret);
248 }
249
250 4 return ret;
251 }
252
253 125 const char *av_basename(const char *path)
254 {
255 char *p;
256 #if HAVE_DOS_PATHS
257 char *q, *d;
258 #endif
259
260
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 125 if (!path || *path == '\0')
261 ✗ return ".";
262
263 125 p = strrchr(path, '/');
264 #if HAVE_DOS_PATHS
265 q = strrchr(path, '\\');
266 d = strchr(path, ':');
267 p = FFMAX3(p, q, d);
268 #endif
269
270
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 125 if (!p)
271 5 return path;
272
273 120 return p + 1;
274 }
275
276 25 const char *av_dirname(char *path)
277 {
278
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 25 char *p = path ? strrchr(path, '/') : NULL;
279
280 #if HAVE_DOS_PATHS
281 char *q = path ? strrchr(path, '\\') : NULL;
282 char *d = path ? strchr(path, ':') : NULL;
283
284 d = d ? d + 1 : d;
285
286 p = FFMAX3(p, q, d);
287 #endif
288
289
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 25 if (!p)
290 3 return ".";
291
292 22 *p = '\0';
293
294 22 return path;
295 }
296
297 8 char *av_append_path_component(const char *path, const char *component)
298 {
299 size_t p_len, c_len;
300 char *fullpath;
301
302
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 8 if (!path)
303 2 return av_strdup(component);
304
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 6 if (!component)
305 1 return av_strdup(path);
306
307 5 p_len = strlen(path);
308 5 c_len = strlen(component);
309
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 5 if (p_len > SIZE_MAX - c_len || p_len + c_len > SIZE_MAX - 2)
310 ✗ return NULL;
311 5 fullpath = av_malloc(p_len + c_len + 2);
312
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 5 if (fullpath) {
313
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 5 if (p_len) {
314 5 av_strlcpy(fullpath, path, p_len + 1);
315
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 5 if (c_len) {
316
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 5 if (fullpath[p_len - 1] != '/' && component[0] != '/')
317 1 fullpath[p_len++] = '/';
318
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 4 else if (fullpath[p_len - 1] == '/' && component[0] == '/')
319 2 p_len--;
320 }
321 }
322 5 av_strlcpy(&fullpath[p_len], component, c_len + 1);
323 5 fullpath[p_len + c_len] = 0;
324 }
325 5 return fullpath;
326 }
327
328 ✗ int av_escape(char **dst, const char *src, const char *special_chars,
329 enum AVEscapeMode mode, int flags)
330 {
331 AVBPrint dstbuf;
332 int ret;
333
334 ✗ av_bprint_init(&dstbuf, 1, INT_MAX); /* (int)dstbuf.len must be >= 0 */
335 ✗ av_bprint_escape(&dstbuf, src, special_chars, mode, flags);
336
337 ✗ if (!av_bprint_is_complete(&dstbuf)) {
338 ✗ av_bprint_finalize(&dstbuf, NULL);
339 ✗ return AVERROR(ENOMEM);
340 }
341 ✗ if ((ret = av_bprint_finalize(&dstbuf, dst)) < 0)
342 ✗ return ret;
343 ✗ return dstbuf.len;
344 }
345
346 8187194 int av_match_name(const char *name, const char *names)
347 {
348 const char *p;
349 size_t len, namelen;
350
351
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 8187194 if (!name || !names)
352 5091653 return 0;
353
354 3095541 namelen = strlen(name);
355
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 6593845 while (*names) {
356 3514638 int negate = '-' == *names;
357 3514638 p = strchr(names, ',');
358
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 3514638 if (!p)
359 3094311 p = names + strlen(names);
360 3514638 names += negate;
361 3514638 len = FFMAX(p - names, namelen);
362
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 3514638 if (!av_strncasecmp(name, names, len) || !strncmp("ALL", names, FFMAX(3, p - names)))
363 16334 return !negate;
364 3498304 names = p + (*p == ',');
365 }
366 3079207 return 0;
367 }
368
369 87273 int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,
370 unsigned int flags)
371 {
372 87273 const uint8_t *p = *bufp;
373 uint32_t top;
374 uint64_t code;
375 87273 int ret = 0, tail_len;
376 87273 uint32_t overlong_encoding_mins[6] = {
377 0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,
378 };
379
380
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 87273 if (p >= buf_end)
381 ✗ return 0;
382
383 87273 code = *p++;
384
385 /* first sequence byte starts with 10, or is 1111-1110 or 1111-1111,
386 which is not admitted */
387
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 87273 if ((code & 0xc0) == 0x80 || code >= 0xFE) {
388 ✗ ret = AVERROR(EILSEQ);
389 ✗ goto end;
390 }
391 87273 top = (code & 128) >> 1;
392
393 87273 tail_len = 0;
394
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 87739 while (code & top) {
395 int tmp;
396 466 tail_len++;
397
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 466 if (p >= buf_end) {
398 ✗ (*bufp) ++;
399 ✗ return AVERROR(EILSEQ); /* incomplete sequence */
400 }
401
402 /* we assume the byte to be in the form 10xx-xxxx */
403 466 tmp = *p++ - 128; /* strip leading 1 */
404
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 466 if (tmp>>6) {
405 ✗ (*bufp) ++;
406 ✗ return AVERROR(EILSEQ);
407 }
408 466 code = (code<<6) + tmp;
409 466 top <<= 5;
410 }
411 87273 code &= (top << 1) - 1;
412
413 /* check for overlong encodings */
414
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 87273 av_assert0(tail_len <= 5);
415
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 87273 if (code < overlong_encoding_mins[tail_len]) {
416 ✗ ret = AVERROR(EILSEQ);
417 ✗ goto end;
418 }
419
420
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 87273 if (code >= 1U<<31) {
421 ✗ ret = AVERROR(EILSEQ); /* out-of-range value */
422 ✗ goto end;
423 }
424
425 87273 *codep = code;
426
427
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 87273 if (code > 0x10FFFF &&
428 ✗ !(flags & AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES))
429 ✗ ret = AVERROR(EILSEQ);
430
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 87273 if (code < 0x20 && code != 0x9 && code != 0xA && code != 0xD &&
431 ✗ flags & AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES)
432 ✗ ret = AVERROR(EILSEQ);
433
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 87273 if (code >= 0xD800 && code <= 0xDFFF &&
434 ✗ !(flags & AV_UTF8_FLAG_ACCEPT_SURROGATES))
435 ✗ ret = AVERROR(EILSEQ);
436
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 87273 if ((code == 0xFFFE || code == 0xFFFF) &&
437 ✗ !(flags & AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS))
438 ✗ ret = AVERROR(EILSEQ);
439
440 87273 end:
441 87273 *bufp = p;
442 87273 return ret;
443 }
444
445 139 int av_match_list(const char *name, const char *list, char separator)
446 {
447 const char *p, *q;
448
449
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 278 for (p = name; p && *p; ) {
450
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 282 for (q = list; q && *q; ) {
451 int k;
452
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 699 for (k = 0; p[k] == q[k] || (p[k]*q[k] == 0 && p[k]+q[k] == separator); k++)
453
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 695 if (k && (!p[k] || p[k] == separator))
454 139 return 1;
455 4 q = strchr(q, separator);
456
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 4 if(q)
457 4 q++;
458 }
459 ✗ p = strchr(p, separator);
460 ✗ if (p)
461 ✗ p++;
462 }
463
464 ✗ return 0;
465 }
466