| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2007 Mans Rullgard | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #ifndef AVUTIL_AVSTRING_H | ||
| 22 | #define AVUTIL_AVSTRING_H | ||
| 23 | |||
| 24 | #include <stddef.h> | ||
| 25 | #include <stdint.h> | ||
| 26 | #include "attributes.h" | ||
| 27 | |||
| 28 | /** | ||
| 29 | * @addtogroup lavu_string | ||
| 30 | * @{ | ||
| 31 | */ | ||
| 32 | |||
| 33 | /** | ||
| 34 | * Return non-zero if pfx is a prefix of str. If it is, *ptr is set to | ||
| 35 | * the address of the first character in str after the prefix. | ||
| 36 | * | ||
| 37 | * @param str input string | ||
| 38 | * @param pfx prefix to test | ||
| 39 | * @param ptr updated if the prefix is matched inside str | ||
| 40 | * @return non-zero if the prefix matches, zero otherwise | ||
| 41 | */ | ||
| 42 | int av_strstart(const char *str, const char *pfx, const char **ptr); | ||
| 43 | |||
| 44 | /** | ||
| 45 | * Return non-zero if pfx is a prefix of str independent of case. If | ||
| 46 | * it is, *ptr is set to the address of the first character in str | ||
| 47 | * after the prefix. | ||
| 48 | * | ||
| 49 | * @param str input string | ||
| 50 | * @param pfx prefix to test | ||
| 51 | * @param ptr updated if the prefix is matched inside str | ||
| 52 | * @return non-zero if the prefix matches, zero otherwise | ||
| 53 | */ | ||
| 54 | int av_stristart(const char *str, const char *pfx, const char **ptr); | ||
| 55 | |||
| 56 | /** | ||
| 57 | * Locate the first case-independent occurrence in the string haystack | ||
| 58 | * of the string needle. A zero-length string needle is considered to | ||
| 59 | * match at the start of haystack. | ||
| 60 | * | ||
| 61 | * This function is a case-insensitive version of the standard strstr(). | ||
| 62 | * | ||
| 63 | * @param haystack string to search in | ||
| 64 | * @param needle string to search for | ||
| 65 | * @return pointer to the located match within haystack | ||
| 66 | * or a null pointer if no match | ||
| 67 | */ | ||
| 68 | char *av_stristr(const char *haystack, const char *needle); | ||
| 69 | |||
| 70 | /** | ||
| 71 | * Locate the first occurrence of the string needle in the string haystack | ||
| 72 | * where not more than hay_length characters are searched. A zero-length | ||
| 73 | * string needle is considered to match at the start of haystack. | ||
| 74 | * | ||
| 75 | * This function is a length-limited version of the standard strstr(). | ||
| 76 | * | ||
| 77 | * @param haystack string to search in | ||
| 78 | * @param needle string to search for | ||
| 79 | * @param hay_length length of string to search in | ||
| 80 | * @return pointer to the located match within haystack | ||
| 81 | * or a null pointer if no match | ||
| 82 | */ | ||
| 83 | char *av_strnstr(const char *haystack, const char *needle, size_t hay_length); | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Copy the string src to dst, but no more than size - 1 bytes, and | ||
| 87 | * null-terminate dst. | ||
| 88 | * | ||
| 89 | * This function is the same as BSD strlcpy(). | ||
| 90 | * | ||
| 91 | * @param dst destination buffer | ||
| 92 | * @param src source string | ||
| 93 | * @param size size of destination buffer | ||
| 94 | * @return the length of src | ||
| 95 | * | ||
| 96 | * @warning since the return value is the length of src, src absolutely | ||
| 97 | * _must_ be a properly 0-terminated string, otherwise this will read beyond | ||
| 98 | * the end of the buffer and possibly crash. | ||
| 99 | */ | ||
| 100 | size_t av_strlcpy(char *dst, const char *src, size_t size); | ||
| 101 | |||
| 102 | /** | ||
| 103 | * Append the string src to the string dst, but to a total length of | ||
| 104 | * no more than size - 1 bytes, and null-terminate dst. | ||
| 105 | * | ||
| 106 | * This function is similar to BSD strlcat(), but differs when | ||
| 107 | * size <= strlen(dst). | ||
| 108 | * | ||
| 109 | * @param dst destination buffer | ||
| 110 | * @param src source string | ||
| 111 | * @param size size of destination buffer | ||
| 112 | * @return the total length of src and dst | ||
| 113 | * | ||
| 114 | * @warning since the return value use the length of src and dst, these | ||
| 115 | * absolutely _must_ be a properly 0-terminated strings, otherwise this | ||
| 116 | * will read beyond the end of the buffer and possibly crash. | ||
| 117 | */ | ||
| 118 | size_t av_strlcat(char *dst, const char *src, size_t size); | ||
| 119 | |||
| 120 | /** | ||
| 121 | * Append output to a string, according to a format. Never write out of | ||
| 122 | * the destination buffer, and always put a terminating 0 within | ||
| 123 | * the buffer. | ||
| 124 | * @param dst destination buffer (string to which the output is | ||
| 125 | * appended) | ||
| 126 | * @param size total size of the destination buffer | ||
| 127 | * @param fmt printf-compatible format string, specifying how the | ||
| 128 | * following parameters are used | ||
| 129 | * @return the length of the string that would have been generated | ||
| 130 | * if enough space had been available | ||
| 131 | */ | ||
| 132 | size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...) av_printf_format(3, 4); | ||
| 133 | |||
| 134 | /** | ||
| 135 | * Get the count of continuous non zero chars starting from the beginning. | ||
| 136 | * | ||
| 137 | * @param s the string whose length to count | ||
| 138 | * @param len maximum number of characters to check in the string, that | ||
| 139 | * is the maximum value which is returned by the function | ||
| 140 | */ | ||
| 141 | 311 | static inline size_t av_strnlen(const char *s, size_t len) | |
| 142 | { | ||
| 143 | size_t i; | ||
| 144 |
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10632 | for (i = 0; i < len && s[i]; i++) |
| 145 | ; | ||
| 146 | 311 | return i; | |
| 147 | } | ||
| 148 | |||
| 149 | /** | ||
| 150 | * Print arguments following specified format into a large enough auto | ||
| 151 | * allocated buffer. It is similar to GNU asprintf(). | ||
| 152 | * @param fmt printf-compatible format string, specifying how the | ||
| 153 | * following parameters are used. | ||
| 154 | * @return the allocated string | ||
| 155 | * @note You have to free the string yourself with av_free(). | ||
| 156 | */ | ||
| 157 | char *av_asprintf(const char *fmt, ...) av_printf_format(1, 2); | ||
| 158 | |||
| 159 | /** | ||
| 160 | * Unescape the given string until a non escaped terminating char, | ||
| 161 | * and return the token corresponding to the unescaped string. | ||
| 162 | * | ||
| 163 | * The normal \ and ' escaping is supported. Leading and trailing | ||
| 164 | * whitespaces are removed, unless they are escaped with '\' or are | ||
| 165 | * enclosed between ''. | ||
| 166 | * | ||
| 167 | * @param buf the buffer to parse, buf will be updated to point to the | ||
| 168 | * terminating char | ||
| 169 | * @param term a 0-terminated list of terminating chars | ||
| 170 | * @return the malloced unescaped string, which must be av_freed by | ||
| 171 | * the user, NULL in case of allocation failure | ||
| 172 | */ | ||
| 173 | char *av_get_token(const char **buf, const char *term); | ||
| 174 | |||
| 175 | /** | ||
| 176 | * Split the string into several tokens which can be accessed by | ||
| 177 | * successive calls to av_strtok(). | ||
| 178 | * | ||
| 179 | * A token is defined as a sequence of characters not belonging to the | ||
| 180 | * set specified in delim. | ||
| 181 | * | ||
| 182 | * On the first call to av_strtok(), s should point to the string to | ||
| 183 | * parse, and the value of saveptr is ignored. In subsequent calls, s | ||
| 184 | * should be NULL, and saveptr should be unchanged since the previous | ||
| 185 | * call. | ||
| 186 | * | ||
| 187 | * This function is similar to strtok_r() defined in POSIX.1. | ||
| 188 | * | ||
| 189 | * @param s the string to parse, may be NULL | ||
| 190 | * @param delim 0-terminated list of token delimiters, must be non-NULL | ||
| 191 | * @param saveptr user-provided pointer which points to stored | ||
| 192 | * information necessary for av_strtok() to continue scanning the same | ||
| 193 | * string. saveptr is updated to point to the next character after the | ||
| 194 | * first delimiter found, or to NULL if the string was terminated | ||
| 195 | * @return the found token, or NULL when no token is found | ||
| 196 | */ | ||
| 197 | char *av_strtok(char *s, const char *delim, char **saveptr); | ||
| 198 | |||
| 199 | /** | ||
| 200 | * Locale-independent conversion of ASCII isdigit. | ||
| 201 | */ | ||
| 202 | 4360002 | static inline av_const int av_isdigit(int c) | |
| 203 | { | ||
| 204 |
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4360002 | return c >= '0' && c <= '9'; |
| 205 | } | ||
| 206 | |||
| 207 | /** | ||
| 208 | * Locale-independent conversion of ASCII isgraph. | ||
| 209 | */ | ||
| 210 | ✗ | static inline av_const int av_isgraph(int c) | |
| 211 | { | ||
| 212 | ✗ | return c > 32 && c < 127; | |
| 213 | } | ||
| 214 | |||
| 215 | /** | ||
| 216 | * Locale-independent conversion of ASCII isspace. | ||
| 217 | */ | ||
| 218 | 238435 | static inline av_const int av_isspace(int c) | |
| 219 | { | ||
| 220 |
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238435 | return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || |
| 221 | c == '\v'; | ||
| 222 | } | ||
| 223 | |||
| 224 | /** | ||
| 225 | * Locale-independent conversion of ASCII characters to uppercase. | ||
| 226 | */ | ||
| 227 | 12539882 | static inline av_const int av_toupper(int c) | |
| 228 | { | ||
| 229 |
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12539882 | if (c >= 'a' && c <= 'z') |
| 230 | 9840553 | c ^= 0x20; | |
| 231 | 12539882 | return c; | |
| 232 | } | ||
| 233 | |||
| 234 | /** | ||
| 235 | * Locale-independent conversion of ASCII characters to lowercase. | ||
| 236 | */ | ||
| 237 | 8003372 | static inline av_const int av_tolower(int c) | |
| 238 | { | ||
| 239 |
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8003372 | if (c >= 'A' && c <= 'Z') |
| 240 | 87596 | c ^= 0x20; | |
| 241 | 8003372 | return c; | |
| 242 | } | ||
| 243 | |||
| 244 | /** | ||
| 245 | * Locale-independent conversion of ASCII isxdigit. | ||
| 246 | */ | ||
| 247 | 8 | static inline av_const int av_isxdigit(int c) | |
| 248 | { | ||
| 249 | 8 | c = av_tolower(c); | |
| 250 |
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8 | return av_isdigit(c) || (c >= 'a' && c <= 'f'); |
| 251 | } | ||
| 252 | |||
| 253 | /** | ||
| 254 | * Locale-independent case-insensitive compare. | ||
| 255 | * @note This means only ASCII-range characters are case-insensitive | ||
| 256 | */ | ||
| 257 | int av_strcasecmp(const char *a, const char *b); | ||
| 258 | |||
| 259 | /** | ||
| 260 | * Locale-independent case-insensitive compare. | ||
| 261 | * @note This means only ASCII-range characters are case-insensitive | ||
| 262 | */ | ||
| 263 | int av_strncasecmp(const char *a, const char *b, size_t n); | ||
| 264 | |||
| 265 | /** | ||
| 266 | * Locale-independent strings replace. | ||
| 267 | * @note This means only ASCII-range characters are replaced. | ||
| 268 | */ | ||
| 269 | char *av_strireplace(const char *str, const char *from, const char *to); | ||
| 270 | |||
| 271 | /** | ||
| 272 | * Thread safe basename. | ||
| 273 | * @param path the string to parse, on DOS both \ and / are considered separators. | ||
| 274 | * @return pointer to the basename substring. | ||
| 275 | * If path does not contain a slash, the function returns a copy of path. | ||
| 276 | * If path is a NULL pointer or points to an empty string, a pointer | ||
| 277 | * to a string "." is returned. | ||
| 278 | */ | ||
| 279 | const char *av_basename(const char *path); | ||
| 280 | |||
| 281 | /** | ||
| 282 | * Thread safe dirname. | ||
| 283 | * @param path the string to parse, on DOS both \ and / are considered separators. | ||
| 284 | * @return A pointer to a string that's the parent directory of path. | ||
| 285 | * If path is a NULL pointer or points to an empty string, a pointer | ||
| 286 | * to a string "." is returned. | ||
| 287 | * @note the function may modify the contents of the path, so copies should be passed. | ||
| 288 | */ | ||
| 289 | const char *av_dirname(char *path); | ||
| 290 | |||
| 291 | /** | ||
| 292 | * Match instances of a name in a comma-separated list of names. | ||
| 293 | * List entries are checked from the start to the end of the names list, | ||
| 294 | * the first match ends further processing. If an entry prefixed with '-' | ||
| 295 | * matches, then 0 is returned. The "ALL" list entry is considered to | ||
| 296 | * match all names. | ||
| 297 | * | ||
| 298 | * @param name Name to look for. | ||
| 299 | * @param names List of names. | ||
| 300 | * @return 1 on match, 0 otherwise. | ||
| 301 | */ | ||
| 302 | int av_match_name(const char *name, const char *names); | ||
| 303 | |||
| 304 | /** | ||
| 305 | * Append path component to the existing path. | ||
| 306 | * Path separator '/' is placed between when needed. | ||
| 307 | * Resulting string have to be freed with av_free(). | ||
| 308 | * @param path base path | ||
| 309 | * @param component component to be appended | ||
| 310 | * @return new path or NULL on error. | ||
| 311 | */ | ||
| 312 | char *av_append_path_component(const char *path, const char *component); | ||
| 313 | |||
| 314 | enum AVEscapeMode { | ||
| 315 | AV_ESCAPE_MODE_AUTO, ///< Use auto-selected escaping mode. | ||
| 316 | AV_ESCAPE_MODE_BACKSLASH, ///< Use backslash escaping. | ||
| 317 | AV_ESCAPE_MODE_QUOTE, ///< Use single-quote escaping. | ||
| 318 | AV_ESCAPE_MODE_XML, ///< Use XML non-markup character data escaping. | ||
| 319 | }; | ||
| 320 | |||
| 321 | /** | ||
| 322 | * Consider spaces special and escape them even in the middle of the | ||
| 323 | * string. | ||
| 324 | * | ||
| 325 | * This is equivalent to adding the whitespace characters to the special | ||
| 326 | * characters lists, except it is guaranteed to use the exact same list | ||
| 327 | * of whitespace characters as the rest of libavutil. | ||
| 328 | */ | ||
| 329 | #define AV_ESCAPE_FLAG_WHITESPACE (1 << 0) | ||
| 330 | |||
| 331 | /** | ||
| 332 | * Escape only specified special characters. | ||
| 333 | * Without this flag, escape also any characters that may be considered | ||
| 334 | * special by av_get_token(), such as the single quote. | ||
| 335 | */ | ||
| 336 | #define AV_ESCAPE_FLAG_STRICT (1 << 1) | ||
| 337 | |||
| 338 | /** | ||
| 339 | * Within AV_ESCAPE_MODE_XML, additionally escape single quotes for single | ||
| 340 | * quoted attributes. | ||
| 341 | */ | ||
| 342 | #define AV_ESCAPE_FLAG_XML_SINGLE_QUOTES (1 << 2) | ||
| 343 | |||
| 344 | /** | ||
| 345 | * Within AV_ESCAPE_MODE_XML, additionally escape double quotes for double | ||
| 346 | * quoted attributes. | ||
| 347 | */ | ||
| 348 | #define AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES (1 << 3) | ||
| 349 | |||
| 350 | |||
| 351 | /** | ||
| 352 | * Escape string in src, and put the escaped string in an allocated | ||
| 353 | * string in *dst, which must be freed with av_free(). | ||
| 354 | * | ||
| 355 | * @param dst pointer where an allocated string is put | ||
| 356 | * @param src string to escape, must be non-NULL | ||
| 357 | * @param special_chars string containing the special characters which | ||
| 358 | * need to be escaped, can be NULL | ||
| 359 | * @param mode escape mode to employ, see AV_ESCAPE_MODE_* macros. | ||
| 360 | * Any unknown value for mode will be considered equivalent to | ||
| 361 | * AV_ESCAPE_MODE_BACKSLASH, but this behaviour can change without | ||
| 362 | * notice. | ||
| 363 | * @param flags flags which control how to escape, see AV_ESCAPE_FLAG_ macros | ||
| 364 | * @return the length of the allocated string, or a negative error code in case of error | ||
| 365 | * @see av_bprint_escape() | ||
| 366 | */ | ||
| 367 | av_warn_unused_result | ||
| 368 | int av_escape(char **dst, const char *src, const char *special_chars, | ||
| 369 | enum AVEscapeMode mode, int flags); | ||
| 370 | |||
| 371 | #define AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES 1 ///< accept codepoints over 0x10FFFF | ||
| 372 | #define AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS 2 ///< accept non-characters - 0xFFFE and 0xFFFF | ||
| 373 | #define AV_UTF8_FLAG_ACCEPT_SURROGATES 4 ///< accept UTF-16 surrogates codes | ||
| 374 | #define AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES 8 ///< exclude control codes not accepted by XML | ||
| 375 | |||
| 376 | #define AV_UTF8_FLAG_ACCEPT_ALL \ | ||
| 377 | AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES|AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS|AV_UTF8_FLAG_ACCEPT_SURROGATES | ||
| 378 | |||
| 379 | /** | ||
| 380 | * Read and decode a single UTF-8 code point (character) from the | ||
| 381 | * buffer in *buf, and update *buf to point to the next byte to | ||
| 382 | * decode. | ||
| 383 | * | ||
| 384 | * In case of an invalid byte sequence, the pointer will be updated to | ||
| 385 | * the next byte after the invalid sequence and the function will | ||
| 386 | * return an error code. | ||
| 387 | * | ||
| 388 | * Depending on the specified flags, the function will also fail in | ||
| 389 | * case the decoded code point does not belong to a valid range. | ||
| 390 | * | ||
| 391 | * @note For speed-relevant code a carefully implemented use of | ||
| 392 | * GET_UTF8() may be preferred. | ||
| 393 | * | ||
| 394 | * @param codep pointer used to return the parsed code in case of success. | ||
| 395 | * The value in *codep is set even in case the range check fails. | ||
| 396 | * @param bufp pointer to the address the first byte of the sequence | ||
| 397 | * to decode, updated by the function to point to the | ||
| 398 | * byte next after the decoded sequence | ||
| 399 | * @param buf_end pointer to the end of the buffer, points to the next | ||
| 400 | * byte past the last in the buffer. This is used to | ||
| 401 | * avoid buffer overreads (in case of an unfinished | ||
| 402 | * UTF-8 sequence towards the end of the buffer). | ||
| 403 | * @param flags a collection of AV_UTF8_FLAG_* flags | ||
| 404 | * @return >= 0 in case a sequence was successfully read, a negative | ||
| 405 | * value in case of invalid sequence | ||
| 406 | */ | ||
| 407 | av_warn_unused_result | ||
| 408 | int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end, | ||
| 409 | unsigned int flags); | ||
| 410 | |||
| 411 | /** | ||
| 412 | * Check if a name is in a list. | ||
| 413 | * @returns 0 if not found, or the 1 based index where it has been found in the | ||
| 414 | * list. | ||
| 415 | */ | ||
| 416 | int av_match_list(const char *name, const char *list, char separator); | ||
| 417 | |||
| 418 | /** | ||
| 419 | * See libc sscanf manual for more information. | ||
| 420 | * Locale-independent sscanf implementation. | ||
| 421 | */ | ||
| 422 | int av_sscanf(const char *string, const char *format, ...); | ||
| 423 | |||
| 424 | /** | ||
| 425 | * @} | ||
| 426 | */ | ||
| 427 | |||
| 428 | #endif /* AVUTIL_AVSTRING_H */ | ||
| 429 |