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adler32.h	1.66 MB	View DL Edit
aes.h	1.77 MB	View DL Edit
aes_ctr.h	2.2 MB	View DL Edit
attributes.h	4.74 MB	View DL Edit
audio_fifo.h	5.76 MB	View DL Edit
avassert.h	2.3 MB	View DL Edit
avconfig.h	180 B	View DL Edit
avstring.h	14.75 MB	View DL Edit
avutil.h	9.62 MB	View DL Edit
base64.h	2.23 MB	View DL Edit
blowfish.h	2.34 MB	View DL Edit
bprint.h	7.61 MB	View DL Edit
bswap.h	2.79 MB	View DL Edit
buffer.h	11.72 MB	View DL Edit
camellia.h	2.09 MB	View DL Edit
cast5.h	2.5 MB	View DL Edit
channel_layout.h	30.52 MB	View DL Edit
common.h	16.75 MB	View DL Edit
cpu.h	5.44 MB	View DL Edit
crc.h	3.04 MB	View DL Edit
csp.h	3.28 MB	View DL Edit
des.h	2.28 MB	View DL Edit
detection_bbox.h	3.37 MB	View DL Edit
dict.h	8.06 MB	View DL Edit
display.h	3.42 MB	View DL Edit
dovi_meta.h	7.46 MB	View DL Edit
downmix_info.h	3.16 MB	View DL Edit
encryption_info.h	6.89 MB	View DL Edit
error.h	5.36 MB	View DL Edit
eval.h	6.16 MB	View DL Edit
ffversion.h	184 B	View DL Edit
fifo.h	14.52 MB	View DL Edit
file.h	2.66 MB	View DL Edit
film_grain_params.h	8.3 MB	View DL Edit
frame.h	31.02 MB	View DL Edit
hash.h	8.26 MB	View DL Edit
hdr_dynamic_metadata.h	12.34 MB	View DL Edit
hdr_dynamic_vivid_metadata.h	8.15 MB	View DL Edit
hmac.h	2.8 MB	View DL Edit
hwcontext.h	23.7 MB	View DL Edit
hwcontext_cuda.h	1.69 MB	View DL Edit
hwcontext_d3d11va.h	6.51 MB	View DL Edit
hwcontext_drm.h	4.56 MB	View DL Edit
hwcontext_dxva2.h	2.35 MB	View DL Edit
hwcontext_mediacodec.h	1.17 MB	View DL Edit
hwcontext_opencl.h	3.02 MB	View DL Edit
hwcontext_qsv.h	1.52 MB	View DL Edit
hwcontext_vaapi.h	3.7 MB	View DL Edit
hwcontext_vdpau.h	1.33 MB	View DL Edit
hwcontext_videotoolbox.h	3.33 MB	View DL Edit
hwcontext_vulkan.h	9.3 MB	View DL Edit
imgutils.h	12.77 MB	View DL Edit
intfloat.h	1.69 MB	View DL Edit
intreadwrite.h	18.32 MB	View DL Edit
lfg.h	2.44 MB	View DL Edit
log.h	12.47 MB	View DL Edit
lzo.h	2 MB	View DL Edit
macros.h	2.25 MB	View DL Edit
mastering_display_metadata.h	3.85 MB	View DL Edit
mathematics.h	7.82 MB	View DL Edit
md5.h	2.04 MB	View DL Edit
mem.h	22.74 MB	View DL Edit
motion_vector.h	1.73 MB	View DL Edit
murmur3.h	3.42 MB	View DL Edit
opt.h	36.33 MB	View DL Edit
parseutils.h	7.4 MB	View DL Edit
pixdesc.h	14.65 MB	View DL Edit
pixelutils.h	2 MB	View DL Edit
pixfmt.h	36.42 MB	View DL Edit
random_seed.h	1.37 MB	View DL Edit
rational.h	6.1 MB	View DL Edit
rc4.h	1.84 MB	View DL Edit
replaygain.h	1.57 MB	View DL Edit
ripemd.h	2.11 MB	View DL Edit
samplefmt.h	10 MB	View DL Edit
sha.h	2.31 MB	View DL Edit
sha512.h	2.36 MB	View DL Edit
spherical.h	7.84 MB	View DL Edit
stereo3d.h	5.13 MB	View DL Edit
tea.h	1.99 MB	View DL Edit
threadmessage.h	3.82 MB	View DL Edit
time.h	1.76 MB	View DL Edit
timecode.h	7.66 MB	View DL Edit
timestamp.h	2.56 MB	View DL Edit
tree.h	5.28 MB	View DL Edit
twofish.h	2.19 MB	View DL Edit
tx.h	5.51 MB	View DL Edit
uuid.h	4.84 MB	View DL Edit
version.h	4.37 MB	View DL Edit
video_enc_params.h	5.85 MB	View DL Edit
xtea.h	2.77 MB	View DL Edit

Edit file: /usr/include/ffmpeg/libavutil/avstring.h

/*
 * Copyright (c) 2007 Mans Rullgard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; 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 <stdint.h>
#include "attributes.h"
#include "version.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);

/**
 * Get the count of continuous non zero chars starting from the beginning.
 *
 * @param len maximum number of characters to check in the string, that
 *            is the maximum value which is returned by the function
 */
static inline size_t av_strnlen(const char *s, size_t len)
{
    size_t i;
    for (i = 0; i < len && s[i]; i++)
        ;
    return i;
}

/**
 * Print arguments following specified format into a large enough auto
 * allocated buffer. It is similar to GNU asprintf().
 * @param fmt printf-compatible format string, specifying how the
 *            following parameters are used.
 * @return the allocated string
 * @note You have to free the string yourself with av_free().
 */
char *av_asprintf(const char *fmt, ...) av_printf_format(1, 2);

#if FF_API_D2STR
/**
 * Convert a number to an av_malloced string.
 * @deprecated  use av_asprintf() with "%f" or a more specific format
 */
attribute_deprecated
char *av_d2str(double d);
#endif

/**
 * 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);

/**
 * Split the string into several tokens which can be accessed by
 * successive calls to av_strtok().
 *
 * A token is defined as a sequence of characters not belonging to the
 * set specified in delim.
 *
 * On the first call to av_strtok(), s should point to the string to
 * parse, and the value of saveptr is ignored. In subsequent calls, s
 * should be NULL, and saveptr should be unchanged since the previous
 * call.
 *
 * This function is similar to strtok_r() defined in POSIX.1.
 *
 * @param s the string to parse, may be NULL
 * @param delim 0-terminated list of token delimiters, must be non-NULL
 * @param saveptr user-provided pointer which points to stored
 * information necessary for av_strtok() to continue scanning the same
 * string. saveptr is updated to point to the next character after the
 * first delimiter found, or to NULL if the string was terminated
 * @return the found token, or NULL when no token is found
 */
char *av_strtok(char *s, const char *delim, char **saveptr);

/**
 * 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);

/**
 * Locale-independent strings replace.
 * @note This means only ASCII-range characters are replace
 */
char *av_strireplace(const char *str, const char *from, const char *to);

/**
 * Thread safe basename.
 * @param path the string to parse, on DOS both \ and / are considered separators.
 * @return pointer to the basename substring.
 * If path does not contain a slash, the function returns a copy of path.
 * If path is a NULL pointer or points to an empty string, a pointer
 * to a string "." is returned.
 */
const char *av_basename(const char *path);

/**
 * Thread safe dirname.
 * @param path the string to parse, on DOS both \ and / are considered separators.
 * @return A pointer to a string that's the parent directory of path.
 * If path is a NULL pointer or points to an empty string, a pointer
 * to a string "." is returned.
 * @note the function may modify the contents of the path, so copies should be passed.
 */
const char *av_dirname(char *path);

/**
 * Match instances of a name in a comma-separated list of names.
 * List entries are checked from the start to the end of the names list,
 * the first match ends further processing. If an entry prefixed with '-'
 * matches, then 0 is returned. The "ALL" list entry is considered to
 * match all 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);

/**
 * Append path component to the existing path.
 * Path separator '/' is placed between when needed.
 * Resulting string have to be freed with av_free().
 * @param path      base path
 * @param component component to be appended
 * @return new path or NULL on error.
 */
char *av_append_path_component(const char *path, const char *component);

enum AVEscapeMode {
    AV_ESCAPE_MODE_AUTO,      ///< Use auto-selected escaping mode.
    AV_ESCAPE_MODE_BACKSLASH, ///< Use backslash escaping.
    AV_ESCAPE_MODE_QUOTE,     ///< Use single-quote escaping.
    AV_ESCAPE_MODE_XML,       ///< Use XML non-markup character data escaping.
};

/**
 * Consider spaces special and escape them even in the middle of the
 * string.
 *
 * This is equivalent to adding the whitespace characters to the special
 * characters lists, except it is guaranteed to use the exact same list
 * of whitespace characters as the rest of libavutil.
 */
#define AV_ESCAPE_FLAG_WHITESPACE (1 << 0)

/**
 * Escape only specified special characters.
 * Without this flag, escape also any characters that may be considered
 * special by av_get_token(), such as the single quote.
 */
#define AV_ESCAPE_FLAG_STRICT (1 << 1)

/**
 * Within AV_ESCAPE_MODE_XML, additionally escape single quotes for single
 * quoted attributes.
 */
#define AV_ESCAPE_FLAG_XML_SINGLE_QUOTES (1 << 2)

/**
 * Within AV_ESCAPE_MODE_XML, additionally escape double quotes for double
 * quoted attributes.
 */
#define AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES (1 << 3)

/**
 * Escape string in src, and put the escaped string in an allocated
 * string in *dst, which must be freed with av_free().
 *
 * @param dst           pointer where an allocated string is put
 * @param src           string to escape, must be non-NULL
 * @param special_chars string containing the special characters which
 *                      need to be escaped, can be NULL
 * @param mode          escape mode to employ, see AV_ESCAPE_MODE_* macros.
 *                      Any unknown value for mode will be considered equivalent to
 *                      AV_ESCAPE_MODE_BACKSLASH, but this behaviour can change without
 *                      notice.
 * @param flags         flags which control how to escape, see AV_ESCAPE_FLAG_ macros
 * @return the length of the allocated string, or a negative error code in case of error
 * @see av_bprint_escape()
 */
av_warn_unused_result
int av_escape(char **dst, const char *src, const char *special_chars,
              enum AVEscapeMode mode, int flags);

#define AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES          1 ///< accept codepoints over 0x10FFFF
#define AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS             2 ///< accept non-characters - 0xFFFE and 0xFFFF
#define AV_UTF8_FLAG_ACCEPT_SURROGATES                 4 ///< accept UTF-16 surrogates codes
#define AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES 8 ///< exclude control codes not accepted by XML

#define AV_UTF8_FLAG_ACCEPT_ALL \
    AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES|AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS|AV_UTF8_FLAG_ACCEPT_SURROGATES

/**
 * Read and decode a single UTF-8 code point (character) from the
 * buffer in *buf, and update *buf to point to the next byte to
 * decode.
 *
 * In case of an invalid byte sequence, the pointer will be updated to
 * the next byte after the invalid sequence and the function will
 * return an error code.
 *
 * Depending on the specified flags, the function will also fail in
 * case the decoded code point does not belong to a valid range.
 *
 * @note For speed-relevant code a carefully implemented use of
 * GET_UTF8() may be preferred.
 *
 * @param codep   pointer used to return the parsed code in case of success.
 *                The value in *codep is set even in case the range check fails.
 * @param bufp    pointer to the address the first byte of the sequence
 *                to decode, updated by the function to point to the
 *                byte next after the decoded sequence
 * @param buf_end pointer to the end of the buffer, points to the next
 *                byte past the last in the buffer. This is used to
 *                avoid buffer overreads (in case of an unfinished
 *                UTF-8 sequence towards the end of the buffer).
 * @param flags   a collection of AV_UTF8_FLAG_* flags
 * @return >= 0 in case a sequence was successfully read, a negative
 * value in case of invalid sequence
 */
av_warn_unused_result
int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end,
                   unsigned int flags);

/**
 * Check if a name is in a list.
 * @returns 0 if not found, or the 1 based index where it has been found in the
 *            list.
 */
int av_match_list(const char *name, const char *list, char separator);

/**
 * See libc sscanf manual for more information.
 * Locale-independent sscanf implementation.
 */
int av_sscanf(const char *string, const char *format, ...);

/**
 * @}
 */

#endif /* AVUTIL_AVSTRING_H */

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