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 size_t 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\r"

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 char *av_strireplace(const char *str, const char *from, const char *to)

235 {

236 char *ret = NULL;

237 const char *pstr2, *pstr = str;

238 size_t tolen = strlen(to), fromlen = strlen(from);

239 AVBPrint pbuf;

240

241 av_bprint_init(&pbuf, 1, AV_BPRINT_SIZE_UNLIMITED);

242 while ((pstr2 = av_stristr(pstr, from))) {

243 av_bprint_append_data(&pbuf, pstr, pstr2 - pstr);

244 pstr = pstr2 + fromlen;

245 av_bprint_append_data(&pbuf, to, tolen);

246 }

247 av_bprint_append_data(&pbuf, pstr, strlen(pstr));

248 if (!av_bprint_is_complete(&pbuf)) {

249 av_bprint_finalize(&pbuf, NULL);

250 } else {

251 av_bprint_finalize(&pbuf, &ret);

252 }

253

254 return ret;

255 }

256

257 const char *av_basename(const char *path)

258 {

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

260

261 #if HAVE_DOS_PATHS

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

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

264

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

266 #endif

267

268 if (!p)

269 return path;

270

271 return p + 1;

272 }

273

274 const char *av_dirname(char *path)

275 {

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

277

278 #if HAVE_DOS_PATHS

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

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

281

282 d = d ? d + 1 : d;

283

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

285 #endif

286

287 if (!p)

288 return ".";

289

290 *p = '0円';

291

292 return path;

293 }

294

295 char *av_append_path_component(const char *path, const char *component)

296 {

297 size_t p_len, c_len;

298 char *fullpath;

299

300 if (!path)

301 return av_strdup(component);

302 if (!component)

303 return av_strdup(path);

304

305 p_len = strlen(path);

306 c_len = strlen(component);

307 if (p_len > SIZE_MAX - c_len || p_len + c_len > SIZE_MAX - 2)

308 return NULL;

309 fullpath = av_malloc(p_len + c_len + 2);

310 if (fullpath) {

311 if (p_len) {

312 av_strlcpy(fullpath, path, p_len + 1);

313 if (c_len) {

314 if (fullpath[p_len - 1] != '/' && component[0] != '/')

315 fullpath[p_len++] = '/';

316 else if (fullpath[p_len - 1] == '/' && component[0] == '/')

317 p_len--;

318 }

319 }

320 av_strlcpy(&fullpath[p_len], component, c_len + 1);

321 fullpath[p_len + c_len] = 0;

322 }

323 return fullpath;

324 }

325

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

327 enum AVEscapeMode mode, int flags)

328 {

329 AVBPrint dstbuf;

330

331 av_bprint_init(&dstbuf, 1, AV_BPRINT_SIZE_UNLIMITED);

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

333

334 if (!av_bprint_is_complete(&dstbuf)) {

335 av_bprint_finalize(&dstbuf, NULL);

336 return AVERROR(ENOMEM);

337 } else {

338 av_bprint_finalize(&dstbuf, dst);

339 return dstbuf.len;

340 }

341 }

342

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

344 {

345 const char *p;

346 int len, namelen;

347

348 if (!name || !names)

349 return 0;

350

351 namelen = strlen(name);

352 while (*names) {

353 int negate = '-' == *names;

354 p = strchr(names, ',');

355 if (!p)

356 p = names + strlen(names);

357 names += negate;

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

359 if (!av_strncasecmp(name, names, len) || !strncmp("ALL", names, FFMAX(3, p - names)))

360 return !negate;

361 names = p + (*p == ',');

362 }

363 return 0;

364 }

365

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

367 unsigned int flags)

368 {

369 const uint8_t *p = *bufp;

370 uint32_t top;

371 uint64_t code;

372 int ret = 0, tail_len;

373 uint32_t overlong_encoding_mins[6] = {

374 0x00000000, 0x00000080, 0x00000800, 0x00010000, 0x00200000, 0x04000000,

375 };

376

377 if (p >= buf_end)

378 return 0;

379

380 code = *p++;

381

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

383 which is not admitted */

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

385 ret = AVERROR(EILSEQ);

386 goto end;

387 }

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

389

390 tail_len = 0;

391 while (code & top) {

392 int tmp;

393 tail_len++;

394 if (p >= buf_end) {

395 (*bufp) ++;

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

397 }

398

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

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

401 if (tmp>>6) {

402 (*bufp) ++;

403 return AVERROR(EILSEQ);

404 }

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

406 top <<= 5;

407 }

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

409

410 /* check for overlong encodings */

411 av_assert0(tail_len <= 5);

412 if (code < overlong_encoding_mins[tail_len]) {

413 ret = AVERROR(EILSEQ);

414 goto end;

415 }

416

417 if (code >= 1U<<31) {

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

419 goto end;

420 }

421

422 *codep = code;

423

424 if (code > 0x10FFFF &&

425 !(flags & AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES))

426 ret = AVERROR(EILSEQ);

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

428 flags & AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES)

429 ret = AVERROR(EILSEQ);

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

431 !(flags & AV_UTF8_FLAG_ACCEPT_SURROGATES))

432 ret = AVERROR(EILSEQ);

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

434 !(flags & AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS))

435 ret = AVERROR(EILSEQ);

436

437 end:

438 *bufp = p;

439 return ret;

440 }

441

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

443 {

444 const char *p, *q;

445

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

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

448 int k;

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

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

451 return 1;

452 q = strchr(q, separator);

453 q += !!q;

454 }

455 p = strchr(p, separator);

456 p += !!p;

457 }

458

459 return 0;

460 }

NULL

#define NULL

Definition: coverity.c:32

const char * s

Definition: avisynth_c.h:768

av_utf8_decode

int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end, unsigned int flags)

Read and decode a single UTF-8 code point (character) from the buffer in *buf, and update *buf to poi...

Definition: avstring.c:366

fmt

const char * fmt

Definition: avisynth_c.h:769

mem.h

Memory handling functions.

av_stristr

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

Locate the first case-independent occurrence in the string haystack of the string needle...

Definition: avstring.c:56

av_escape

int av_escape(char **dst, const char *src, const char *special_chars, enum AVEscapeMode mode, int flags)

Escape string in src, and put the escaped string in an allocated string in *dst, which must be freed ...

Definition: avstring.c:326

vsnprintf

#define vsnprintf

Definition: snprintf.h:36

const char * b

Definition: vf_curves.c:113

av_strncasecmp

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

Locale-independent case-insensitive compare.

Definition: avstring.c:223

avstring.h

src

#define src

Definition: vp8dsp.c:254

av_bprint_finalize

int av_bprint_finalize(AVBPrint *buf, char **ret_str)

Finalize a print buffer.

Definition: bprint.c:235

WHITESPACES

#define WHITESPACES

Definition: avstring.c:147

av_assert0

#define av_assert0(cond)

assert() equivalent, that is always enabled.

Definition: avassert.h:37

av_stristart

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

Return non-zero if pfx is a prefix of str independent of case.

Definition: avstring.c:45

av_basename

const char * av_basename(const char *path)

Thread safe basename.

Definition: avstring.c:257

config.h

uint8_t

Definition: audio_convert.c:194

av_malloc

#define av_malloc(s)

Definition: tableprint_vlc.h:31

end

static av_cold int end(AVCodecContext *avctx)

Definition: avrndec.c:90

from

const char * from

Definition: jacosubdec.c:65

av_d2str

char * av_d2str(double d)

Convert a number to an av_malloced string.

Definition: avstring.c:139

av_bprint_append_data

void av_bprint_append_data(AVBPrint *buf, const char *data, unsigned size)

Append data to a print buffer.

Definition: bprint.c:158

AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES

#define AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES

accept codepoints over 0x10FFFF

Definition: avstring.h:356

flags

static int flags

Definition: log.c:55

static const uint64_t c1

Definition: murmur3.c:49

size

ptrdiff_t size

Definition: opengl_enc.c:101

AV_UTF8_FLAG_ACCEPT_SURROGATES

#define AV_UTF8_FLAG_ACCEPT_SURROGATES

accept UTF-16 surrogates codes

Definition: avstring.h:358

const char * to

Definition: webvttdec.c:34

#define U(x)

Definition: vp56_arith.h:37

av_tolower

static av_const int av_tolower(int c)

Locale-independent conversion of ASCII characters to lowercase.

Definition: avstring.h:241

AV_BPRINT_SIZE_UNLIMITED

#define AV_BPRINT_SIZE_UNLIMITED

#define s2

Definition: regdef.h:39

AVERROR

#define AVERROR(e)

Definition: error.h:43

av_bprint_init

void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)

Definition: bprint.c:69

av_match_list

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

Check if a name is in a list.

Definition: avstring.c:442

avassert.h

simple assert() macros that are a bit more flexible than ISO C assert().

av_strireplace

char * av_strireplace(const char *str, const char *from, const char *to)

Locale-independent strings replace.

Definition: avstring.c:234

av_match_name

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

Match instances of a name in a comma-separated list of names.

Definition: avstring.c:343

FFMAX

#define FFMAX(a, b)

Definition: common.h:94

av_strlcpy

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

Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.

Definition: avstring.c:83

av_get_token

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

Unescape the given string until a non escaped terminating char, and return the token corresponding to...

Definition: avstring.c:149

av_asprintf

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

Definition: avstring.c:113

AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES

#define AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES

exclude control codes not accepted by XML

Definition: avstring.h:359

av_strcasecmp

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

Locale-independent case-insensitive compare.

Definition: avstring.c:213

int32_t

Definition: audio_convert.c:194

int n

Definition: avisynth_c.h:684

av_bprint_is_complete

static int av_bprint_is_complete(const AVBPrint *buf)

Test if the print buffer is complete (not truncated).

Definition: bprint.h:185

bprint.h

av_strdup

char * av_strdup(const char *s)

Duplicate a string.

Definition: mem.c:251

buf

void * buf

Definition: avisynth_c.h:690

av_toupper

static av_const int av_toupper(int c)

Locale-independent conversion of ASCII characters to uppercase.

Definition: avstring.h:231

av_strlcatf

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

Definition: avstring.c:101

#define s1

Definition: regdef.h:38

snprintf

#define snprintf

Definition: snprintf.h:34

av_strlcat

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

Append the string src to the string dst, but to a total length of no more than size - 1 bytes...

Definition: avstring.c:93

av_strtok

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

Split the string into several tokens which can be accessed by successive calls to av_strtok()...

Definition: avstring.c:184

av_strstart

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

Return non-zero if pfx is a prefix of str.

Definition: avstring.c:34

av_append_path_component

char * av_append_path_component(const char *path, const char *component)

Append path component to the existing path.

Definition: avstring.c:295

av_bprint_escape

void av_bprint_escape(AVBPrint *dstbuf, const char *src, const char *special_chars, enum AVEscapeMode mode, int flags)

Escape the content in src and append it to dstbuf.

Definition: bprint.c:265

av_strnstr

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

Locate the first occurrence of the string needle in the string haystack where not more than hay_lengt...

Definition: avstring.c:69

common.h

common internal and external API header

static double c[64]

Definition: vsrc_mptestsrc.c:87

av_dirname

const char * av_dirname(char *path)

Thread safe dirname.

Definition: avstring.c:274

static const uint64_t c2

Definition: murmur3.c:50

len

int len

Definition: vorbis_enc_data.h:452

AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS

#define AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS

accept non-characters - 0xFFFE and 0xFFFF

Definition: avstring.h:357

out

FILE * out

Definition: movenc.c:54

AVEscapeMode

Definition: avstring.h:313

av_freep

#define av_freep(p)

Definition: tableprint_vlc.h:35

mode

Use these values in ebur128_init (or'ed).

Definition: ebur128.h:83

FFMAX3

#define FFMAX3(a, b, c)

Definition: common.h:95

Definition: h264pred_template.c:468

name

const char * name

Definition: opengl_enc.c:103

tmp

static uint8_t tmp[11]

Definition: aes_ctr.c:26

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