/* * Copyright (c) 2007 Mans Rullgard * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVUTIL_AVSTRING_H #define AVUTIL_AVSTRING_H #include <stddef.h> #include "attributes.h" /** * @addtogroup lavu_string * @{ */ /** * Return non-zero if pfx is a prefix of str. If it is, *ptr is set to * the address of the first character in str after the prefix. * * @param str input string * @param pfx prefix to test * @param ptr updated if the prefix is matched inside str * @return non-zero if the prefix matches, zero otherwise */ int av_strstart(const char *str, const char *pfx, const char **ptr); /** * Return non-zero if pfx is a prefix of str independent of case. If * it is, *ptr is set to the address of the first character in str * after the prefix. * * @param str input string * @param pfx prefix to test * @param ptr updated if the prefix is matched inside str * @return non-zero if the prefix matches, zero otherwise */ int av_stristart(const char *str, const char *pfx, const char **ptr); /** * Locate the first case-independent occurrence in the string haystack * of the string needle. A zero-length string needle is considered to * match at the start of haystack. * * This function is a case-insensitive version of the standard strstr(). * * @param haystack string to search in * @param needle string to search for * @return pointer to the located match within haystack * or a null pointer if no match */ char *av_stristr(const char *haystack, const char *needle); /** * Locate the first occurrence of the string needle in the string haystack * where not more than hay_length characters are searched. A zero-length * string needle is considered to match at the start of haystack. * * This function is a length-limited version of the standard strstr(). * * @param haystack string to search in * @param needle string to search for * @param hay_length length of string to search in * @return pointer to the located match within haystack * or a null pointer if no match */ char *av_strnstr(const char *haystack, const char *needle, size_t hay_length); /** * Copy the string src to dst, but no more than size - 1 bytes, and * null-terminate dst. * * This function is the same as BSD strlcpy(). * * @param dst destination buffer * @param src source string * @param size size of destination buffer * @return the length of src * * @warning since the return value is the length of src, src absolutely * _must_ be a properly 0-terminated string, otherwise this will read beyond * the end of the buffer and possibly crash. */ size_t av_strlcpy(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, and null-terminate dst. * * This function is similar to BSD strlcat(), but differs when * size <= strlen(dst). * * @param dst destination buffer * @param src source string * @param size size of destination buffer * @return the total length of src and dst * * @warning since the return value use the length of src and dst, these * absolutely _must_ be a properly 0-terminated strings, otherwise this * will read beyond the end of the buffer and possibly crash. */ size_t av_strlcat(char *dst, const char *src, size_t size); /** * Append output to a string, according to a format. Never write out of * the destination buffer, and always put a terminating 0 within * the buffer. * @param dst destination buffer (string to which the output is * appended) * @param size total size of the destination buffer * @param fmt printf-compatible format string, specifying how the * following parameters are used * @return the length of the string that would have been generated * if enough space had been available */ size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...) av_printf_format(3, 4); /** * Convert a number to a av_malloced string. */ char *av_d2str(double d); /** * Unescape the given string until a non escaped terminating char, * and return the token corresponding to the unescaped string. * * The normal \ and ' escaping is supported. Leading and trailing * whitespaces are removed, unless they are escaped with '\' or are * enclosed between ''. * * @param buf the buffer to parse, buf will be updated to point to the * terminating char * @param term a 0-terminated list of terminating chars * @return the malloced unescaped string, which must be av_freed by * the user, NULL in case of allocation failure */ char *av_get_token(const char **buf, const char *term); /** * Locale-independent conversion of ASCII isdigit. */ static inline av_const int av_isdigit(int c) { return c >= '0' && c <= '9'; } /** * Locale-independent conversion of ASCII isgraph. */ static inline av_const int av_isgraph(int c) { return c > 32 && c < 127; } /** * Locale-independent conversion of ASCII isspace. */ static inline av_const int av_isspace(int c) { return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v'; } /** * Locale-independent conversion of ASCII characters to uppercase. */ static inline av_const int av_toupper(int c) { if (c >= 'a' && c <= 'z') c ^= 0x20; return c; } /** * Locale-independent conversion of ASCII characters to lowercase. */ static inline av_const int av_tolower(int c) { if (c >= 'A' && c <= 'Z') c ^= 0x20; return c; } /** * Locale-independent conversion of ASCII isxdigit. */ static inline av_const int av_isxdigit(int c) { c = av_tolower(c); return av_isdigit(c) || (c >= 'a' && c <= 'f'); } /* * Locale-independent case-insensitive compare. * @note This means only ASCII-range characters are case-insensitive */ int av_strcasecmp(const char *a, const char *b); /** * Locale-independent case-insensitive compare. * @note This means only ASCII-range characters are case-insensitive */ int av_strncasecmp(const char *a, const char *b, size_t n); /** * Thread safe basename. * @param path the path, on DOS both \ and / are considered separators. * @return pointer to the basename substring. */ const char *av_basename(const char *path); /** * Thread safe dirname. * @param path the path, on DOS both \ and / are considered separators. * @return the path with the separator replaced by the string terminator or ".". * @note the function may change the input string. */ const char *av_dirname(char *path); /** * Match instances of a name in a comma-separated list of names. * @param name Name to look for. * @param names List of names. * @return 1 on match, 0 otherwise. */ int av_match_name(const char *name, const char *names); /** * @} */ #endif /* AVUTIL_AVSTRING_H */