summaryrefslogtreecommitdiffstats
path: root/libavutil/avstring.h
blob: 780f109164506c4db7bfdca49e7b64948ac4f959 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
 * 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 */
OpenPOWER on IntegriCloud