FFmpeg: libavutil/avstring.c Source File

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libavutil

avstring.c

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1 /*

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 */

22 #include <stdarg.h>

23 #include <stdint.h>

24 #include <stdio.h>

25 #include <string.h>

27 #include "config.h"

28 #include "common.h"

29 #include "mem.h"

30 #include "avassert.h"

31 #include "avstring.h"

32 #include "bprint.h"

34 int av_strstart(const char *str, const char *pfx, const char **ptr)

35 {

36 while (*pfx && *pfx == *str) {

37 pfx++;

38 str++;

39 }

40 if (!*pfx && ptr)

41 *ptr = str;

42 return !*pfx;

43 }

45 int av_stristart(const char *str, const char *pfx, const char **ptr)

46 {

47 while (*pfx && av_toupper((unsigned)*pfx) == av_toupper((unsigned)*str)) {

48 pfx++;

49 str++;

50 }

51 if (!*pfx && ptr)

52 *ptr = str;

53 return !*pfx;

54 }

56 char *av_stristr(const char *s1, const char *s2)

57 {

58 if (!*s2)

59 return (char*)(intptr_t)s1;

61 do

62 if (av_stristart(s1, s2, NULL))

63 return (char*)(intptr_t)s1;

64 while (*s1++);

66 return NULL;

67 }

69 char *av_strnstr(const char *haystack, const char *needle, size_t hay_length)

70 {

71 size_t needle_len = strlen(needle);

72 if (!needle_len)

73 return (char*)haystack;

74 while (hay_length >= needle_len) {

75 hay_length--;

76 if (!memcmp(haystack, needle, needle_len))

77 return (char*)haystack;

78 haystack++;

79 }

80 return NULL;

81 }

83 size_t av_strlcpy(char *dst, const char *src, size_t size)

84 {

85 size_t len = 0;

86 while (++len < size && *src)

87 *dst++ = *src++;

88 if (len <= size)

89 *dst = 0;

90 return len + strlen(src) - 1;

91 }

93 size_t av_strlcat(char *dst, const char *src, size_t size)

94 {

95 size_t len = strlen(dst);

96 if (size <= len + 1)

97 return len + strlen(src);

98 return len + av_strlcpy(dst + len, src, size - len);

99 }

100

101 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)

102 {

103 int len = strlen(dst);

104 va_list vl;

105

106 va_start(vl, fmt);

107 len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);

108 va_end(vl);

109

110 return len;

111 }

112

113 char *av_asprintf(const char *fmt, ...)

114 {

115 char *p = NULL;

116 va_list va;

117 int len;

118

119 va_start(va, fmt);

120 len = vsnprintf(NULL, 0, fmt, va);

121 va_end(va);

122 if (len < 0)

123 goto end;

124

125 p = av_malloc(len + 1);

126 if (!p)

127 goto end;

128

129 va_start(va, fmt);

130 len = vsnprintf(p, len + 1, fmt, va);

131 va_end(va);

132 if (len < 0)

133 av_freep(&p);

134

135 end:

136 return p;

137 }

138

139 char *av_d2str(double d)

140 {

141 char *str = av_malloc(16);

142 if (str)

143 snprintf(str, 16, "%f", d);

144 return str;

145 }

146

147 #define WHITESPACES " \n\t"

148

149 char *av_get_token(const char **buf, const char *term)

150 {

151 char *out = av_malloc(strlen(*buf) + 1);

152 char *ret = out, *end = out;

153 const char *p = *buf;

154 if (!out)

155 return NULL;

156 p += strspn(p, WHITESPACES);

157

158 while (*p && !strspn(p, term)) {

159 char c = *p++;

160 if (c == '\\' && *p) {

161 *out++ = *p++;

162 end = out;

163 } else if (c == '\'') {

164 while (*p && *p != '\'')

165 *out++ = *p++;

166 if (*p) {

167 p++;

168 end = out;

169 }

170 } else {

171 *out++ = c;

172 }

173 }

174

175 do

176 *out-- = 0;

177 while (out >= end && strspn(out, WHITESPACES));

178

179 *buf = p;

180

181 return ret;

182 }

183

184 char *av_strtok(char *s, const char *delim, char **saveptr)

185 {

186 char *tok;

187

188 if (!s && !(s = *saveptr))

189 return NULL;

190

191 /* skip leading delimiters */

192 s += strspn(s, delim);

193

194 /* s now points to the first non delimiter char, or to the end of the string */

195 if (!*s) {

196 *saveptr = NULL;

197 return NULL;

198 }

199 tok = s++;

200

201 /* skip non delimiters */

202 s += strcspn(s, delim);

203 if (*s) {

204 *s = 0;

205 *saveptr = s+1;

206 } else {

207 *saveptr = NULL;

208 }

209

210 return tok;

211 }

212

213 int av_strcasecmp(const char *a, const char *b)

214 {

215 uint8_t c1, c2;

216 do {

217 c1 = av_tolower(*a++);

218 c2 = av_tolower(*b++);

219 } while (c1 && c1 == c2);

220 return c1 - c2;

221 }

222

223 int av_strncasecmp(const char *a, const char *b, size_t n)

224 {

225 const char *end = a + n;

226 uint8_t c1, c2;

227 do {

228 c1 = av_tolower(*a++);

229 c2 = av_tolower(*b++);

230 } while (a < end && c1 && c1 == c2);

231 return c1 - c2;

232 }

233

234 const char *av_basename(const char *path)

235 {

236 char *p = strrchr(path, '/');

237

238 #if HAVE_DOS_PATHS

239 char *q = strrchr(path, '\\');

240 char *d = strchr(path, ':');

241

242 p = FFMAX3(p, q, d);

243 #endif

244

245 if (!p)

246 return path;

247

248 return p + 1;

249 }

250

251 const char *av_dirname(char *path)

252 {

253 char *p = strrchr(path, '/');

254

255 #if HAVE_DOS_PATHS

256 char *q = strrchr(path, '\\');

257 char *d = strchr(path, ':');

258

259 d = d ? d + 1 : d;

260

261 p = FFMAX3(p, q, d);

262 #endif

263

264 if (!p)

265 return ".";

266

267 *p = '0円';

268

269 return path;

270 }

271

272 int av_escape(char **dst, const char *src, const char *special_chars,

273 enum AVEscapeMode mode, int flags)

274 {

275 AVBPrint dstbuf;

276

277 av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);

278 av_bprint_escape(&dstbuf, src, special_chars, mode, flags);

279

280 if (!av_bprint_is_complete(&dstbuf)) {

281 av_bprint_finalize(&dstbuf, NULL);

282 return AVERROR(ENOMEM);

283 } else {

284 av_bprint_finalize(&dstbuf, dst);

285 return dstbuf.len;

286 }

287 }

288

289 int av_isdigit(int c)

290 {

291 return c >= '0' && c <= '9';

292 }

293

294 int av_isgraph(int c)

295 {

296 return c > 32 && c < 127;

297 }

298

299 int av_isspace(int c)

300 {

301 return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' ||

302 c == '\v';

303 }

304

305 int av_isxdigit(int c)

306 {

307 c = av_tolower(c);

308 return av_isdigit(c) || (c >= 'a' && c <= 'f');

309 }

310

311 int av_match_name(const char *name, const char *names)

312 {

313 const char *p;

314 int len, namelen;

315

316 if (!name || !names)

317 return 0;

318

319 namelen = strlen(name);

320 while ((p = strchr(names, ','))) {

321 len = FFMAX(p - names, namelen);

322 if (!av_strncasecmp(name, names, len))

323 return 1;

324 names = p + 1;

325 }

326 return !av_strcasecmp(name, names);

327 }

328

329 int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,

330 unsigned int flags)

331 {

332 const uint8_t *p = *bufp;

333 uint32_t top;

334 uint64_t code;

335 int ret = 0, tail_len;

336 uint32_t overlong_encoding_mins[6] = {

337 0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,

338 };

339

340 if (p >= buf_end)

341 return 0;

342

343 code = *p++;

344

345 /* first sequence byte starts with 10, or is 1111-1110 or 1111-1111,

346 which is not admitted */

347 if ((code & 0xc0) == 0x80 || code >= 0xFE) {

348 ret = AVERROR(EILSEQ);

349 goto end;

350 }

351 top = (code & 128) >> 1;

352

353 tail_len = 0;

354 while (code & top) {

355 int tmp;

356 tail_len++;

357 if (p >= buf_end) {

358 (*bufp) ++;

359 return AVERROR(EILSEQ); /* incomplete sequence */

360 }

361

362 /* we assume the byte to be in the form 10xx-xxxx */

363 tmp = *p++ - 128; /* strip leading 1 */

364 if (tmp>>6) {

365 (*bufp) ++;

366 return AVERROR(EILSEQ);

367 }

368 code = (code<<6) + tmp;

369 top <<= 5;

370 }

371 code &= (top << 1) - 1;

372

373 /* check for overlong encodings */

374 av_assert0(tail_len <= 5);

375 if (code < overlong_encoding_mins[tail_len]) {

376 ret = AVERROR(EILSEQ);

377 goto end;

378 }

379

380 if (code >= 1<<31) {

381 ret = AVERROR(EILSEQ); /* out-of-range value */

382 goto end;

383 }

384

385 *codep = code;

386

387 if (code > 0x10FFFF &&

388 !(flags & AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES))

389 ret = AVERROR(EILSEQ);

390 if (code < 0x20 && code != 0x9 && code != 0xA && code != 0xD &&

391 flags & AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES)

392 ret = AVERROR(EILSEQ);

393 if (code >= 0xD800 && code <= 0xDFFF &&

394 !(flags & AV_UTF8_FLAG_ACCEPT_SURROGATES))

395 ret = AVERROR(EILSEQ);

396 if ((code == 0xFFFE || code == 0xFFFF) &&

397 !(flags & AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS))

398 ret = AVERROR(EILSEQ);

399

400 end:

401 *bufp = p;

402 return ret;

403 }

404

405 int av_match_list(const char *name, const char *list, char separator)

406 {

407 const char *p, *q;

408

409 for (p = name; p && *p; ) {

410 for (q = list; q && *q; ) {

411 int k;

412 for (k = 0; p[k] == q[k] || (p[k]*q[k] == 0 && p[k]+q[k] == separator); k++)

413 if (k && (!p[k] || p[k] == separator))

414 return 1;

415 q = strchr(q, separator);

416 q += !!q;

417 }

418 p = strchr(p, separator);

419 p += !!p;

420 }

421

422 return 0;

423 }

424

425 #ifdef TEST

426

427 int main(void)

428 {

429 int i;

430 static const char * const strings[] = {

431 "''",

432 "",

433 ":",

434 "\\",

435 "'",

436 " '' :",

437 " '' '' :",

438 "foo '' :",

439 "'foo'",

440 "foo ",

441 " ' foo ' ",

442 "foo\\",

443 "foo': blah:blah",

444 "foo\\: blah:blah",

445 "foo\'",

446 "'foo : ' :blahblah",

447 "\\ :blah",

448 " foo",

449 " foo ",

450 " foo \\ ",

451 "foo ':blah",

452 " foo bar : blahblah",

453 "\\f\\o\\o",

454 "'foo : \\ \\ ' : blahblah",

455 "'\\fo\\o:': blahblah",

456 "\\'fo\\o\\:': foo ' :blahblah"

457 };

458

459 printf("Testing av_get_token()\n");

460 for (i = 0; i < FF_ARRAY_ELEMS(strings); i++) {

461 const char *p = strings[i];

462 char *q;

463 printf("|%s|", p);

464 q = av_get_token(&p, ":");

465 printf(" -> |%s|", q);

466 printf(" + |%s|\n", p);

467 av_free(q);

468 }

469

470 return 0;

471 }

472

473 #endif /* TEST */

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