2 * Copyright (c) 2007 Mans Rullgard
4 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef AVUTIL_AVSTRING_H
22 #define AVUTIL_AVSTRING_H
25 #include "attributes.h"
28 * @addtogroup lavu_string
33 * Return non-zero if pfx is a prefix of str. If it is, *ptr is set to
34 * the address of the first character in str after the prefix.
36 * @param str input string
37 * @param pfx prefix to test
38 * @param ptr updated if the prefix is matched inside str
39 * @return non-zero if the prefix matches, zero otherwise
41 int av_strstart(const char *str, const char *pfx, const char **ptr);
44 * Return non-zero if pfx is a prefix of str independent of case. If
45 * it is, *ptr is set to the address of the first character in str
48 * @param str input string
49 * @param pfx prefix to test
50 * @param ptr updated if the prefix is matched inside str
51 * @return non-zero if the prefix matches, zero otherwise
53 int av_stristart(const char *str, const char *pfx, const char **ptr);
56 * Locate the first case-independent occurrence in the string haystack
57 * of the string needle. A zero-length string needle is considered to
58 * match at the start of haystack.
60 * This function is a case-insensitive version of the standard strstr().
62 * @param haystack string to search in
63 * @param needle string to search for
64 * @return pointer to the located match within haystack
65 * or a null pointer if no match
67 char *av_stristr(const char *haystack, const char *needle);
70 * Locate the first occurrence of the string needle in the string haystack
71 * where not more than hay_length characters are searched. A zero-length
72 * string needle is considered to match at the start of haystack.
74 * This function is a length-limited version of the standard strstr().
76 * @param haystack string to search in
77 * @param needle string to search for
78 * @param hay_length length of string to search in
79 * @return pointer to the located match within haystack
80 * or a null pointer if no match
82 char *av_strnstr(const char *haystack, const char *needle, size_t hay_length);
85 * Copy the string src to dst, but no more than size - 1 bytes, and
88 * This function is the same as BSD strlcpy().
90 * @param dst destination buffer
91 * @param src source string
92 * @param size size of destination buffer
93 * @return the length of src
95 * @warning since the return value is the length of src, src absolutely
96 * _must_ be a properly 0-terminated string, otherwise this will read beyond
97 * the end of the buffer and possibly crash.
99 size_t av_strlcpy(char *dst, const char *src, size_t size);
102 * Append the string src to the string dst, but to a total length of
103 * no more than size - 1 bytes, and null-terminate dst.
105 * This function is similar to BSD strlcat(), but differs when
106 * size <= strlen(dst).
108 * @param dst destination buffer
109 * @param src source string
110 * @param size size of destination buffer
111 * @return the total length of src and dst
113 * @warning since the return value use the length of src and dst, these
114 * absolutely _must_ be a properly 0-terminated strings, otherwise this
115 * will read beyond the end of the buffer and possibly crash.
117 size_t av_strlcat(char *dst, const char *src, size_t size);
120 * Append output to a string, according to a format. Never write out of
121 * the destination buffer, and always put a terminating 0 within
123 * @param dst destination buffer (string to which the output is
125 * @param size total size of the destination buffer
126 * @param fmt printf-compatible format string, specifying how the
127 * following parameters are used
128 * @return the length of the string that would have been generated
129 * if enough space had been available
131 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...) av_printf_format(3, 4);
134 * Print arguments following specified format into a large enough auto
135 * allocated buffer. It is similar to GNU asprintf().
136 * @param fmt printf-compatible format string, specifying how the
137 * following parameters are used.
138 * @return the allocated string
139 * @note You have to free the string yourself with av_free().
141 char *av_asprintf(const char *fmt, ...) av_printf_format(1, 2);
144 * Convert a number to a av_malloced string.
146 char *av_d2str(double d);
149 * Unescape the given string until a non escaped terminating char,
150 * and return the token corresponding to the unescaped string.
152 * The normal \ and ' escaping is supported. Leading and trailing
153 * whitespaces are removed, unless they are escaped with '\' or are
154 * enclosed between ''.
156 * @param buf the buffer to parse, buf will be updated to point to the
158 * @param term a 0-terminated list of terminating chars
159 * @return the malloced unescaped string, which must be av_freed by
160 * the user, NULL in case of allocation failure
162 char *av_get_token(const char **buf, const char *term);
165 * Split the string into several tokens which can be accessed by
166 * successive calls to av_strtok().
168 * A token is defined as a sequence of characters not belonging to the
169 * set specified in delim.
171 * On the first call to av_strtok(), s should point to the string to
172 * parse, and the value of saveptr is ignored. In subsequent calls, s
173 * should be NULL, and saveptr should be unchanged since the previous
176 * This function is similar to strtok_r() defined in POSIX.1.
178 * @param s the string to parse, may be NULL
179 * @param delim 0-terminated list of token delimiters, must be non-NULL
180 * @param saveptr user-provided pointer which points to stored
181 * information necessary for av_strtok() to continue scanning the same
182 * string. saveptr is updated to point to the next character after the
183 * first delimiter found, or to NULL if the string was terminated
184 * @return the found token, or NULL when no token is found
186 char *av_strtok(char *s, const char *delim, char **saveptr);
189 * Locale-independent conversion of ASCII isdigit.
191 static inline int av_isdigit(int c)
193 return c >= '0' && c <= '9';
197 * Locale-independent conversion of ASCII isgraph.
199 static inline int av_isgraph(int c)
201 return c > 32 && c < 127;
205 * Locale-independent conversion of ASCII isspace.
207 static inline int av_isspace(int c)
209 return c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v';
213 * Locale-independent conversion of ASCII characters to uppercase.
215 static inline int av_toupper(int c)
217 if (c >= 'a' && c <= 'z')
223 * Locale-independent conversion of ASCII characters to lowercase.
225 static inline int av_tolower(int c)
227 if (c >= 'A' && c <= 'Z')
233 * Locale-independent conversion of ASCII isxdigit.
235 static inline int av_isxdigit(int c)
238 return av_isdigit(c) || (c >= 'a' && c <= 'z');
242 * Locale-independent case-insensitive compare.
243 * @note This means only ASCII-range characters are case-insensitive
245 int av_strcasecmp(const char *a, const char *b);
248 * Locale-independent case-insensitive compare.
249 * @note This means only ASCII-range characters are case-insensitive
251 int av_strncasecmp(const char *a, const char *b, size_t n);
255 * Thread safe basename.
256 * @param path the path, on DOS both \ and / are considered separators.
257 * @return pointer to the basename substring.
259 const char *av_basename(const char *path);
262 * Thread safe dirname.
263 * @param path the path, on DOS both \ and / are considered separators.
264 * @return the path with the separator replaced by the string terminator or ".".
265 * @note the function may change the input string.
267 const char *av_dirname(char *path);
273 #endif /* AVUTIL_AVSTRING_H */