Go to the documentation of this file.
21 #ifndef AVUTIL_AVSTRING_H
22 #define AVUTIL_AVSTRING_H
42 int av_strstart(
const char *str,
const char *pfx,
const char **ptr);
54 int av_stristart(
const char *str,
const char *pfx,
const char **ptr);
68 char *
av_stristr(
const char *haystack,
const char *needle);
83 char *
av_strnstr(
const char *haystack,
const char *needle,
size_t hay_length);
197 char *
av_strtok(
char *
s, const
char *delim,
char **saveptr);
204 return c >=
'0' &&
c <=
'9';
212 return c > 32 &&
c < 127;
220 return c ==
' ' ||
c ==
'\f' ||
c ==
'\n' ||
c ==
'\r' ||
c ==
'\t' ||
229 if (
c >=
'a' &&
c <=
'z')
239 if (
c >=
'A' &&
c <=
'Z')
329 #define AV_ESCAPE_FLAG_WHITESPACE (1 << 0)
336 #define AV_ESCAPE_FLAG_STRICT (1 << 1)
342 #define AV_ESCAPE_FLAG_XML_SINGLE_QUOTES (1 << 2)
348 #define AV_ESCAPE_FLAG_XML_DOUBLE_QUOTES (1 << 3)
368 int av_escape(
char **dst,
const char *
src,
const char *special_chars,
371 #define AV_UTF8_FLAG_ACCEPT_INVALID_BIG_CODES 1
372 #define AV_UTF8_FLAG_ACCEPT_NON_CHARACTERS 2
373 #define AV_UTF8_FLAG_ACCEPT_SURROGATES 4
374 #define AV_UTF8_FLAG_EXCLUDE_XML_INVALID_CONTROL_CODES 8
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
av_warn_unused_result int av_utf8_decode(int32_t *codep, const uint8_t **bufp, const uint8_t *buf_end, unsigned int flags)
Read and decode a single UTF-8 code point (character) from the buffer in *buf, and update *buf to poi...
static av_const int av_isxdigit(int c)
Locale-independent conversion of ASCII isxdigit.
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
char * av_stristr(const char *haystack, const char *needle)
Locate the first case-independent occurrence in the string haystack of the string needle.
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
static av_const int av_isspace(int c)
Locale-independent conversion of ASCII isspace.
const char * av_basename(const char *path)
Thread safe basename.
char * av_append_path_component(const char *path, const char *component)
Append path component to the existing path.
av_warn_unused_result int av_escape(char **dst, const char *src, const char *special_chars, enum AVEscapeMode mode, int flags)
Escape string in src, and put the escaped string in an allocated string in *dst, which must be freed ...
const char * av_dirname(char *path)
Thread safe dirname.
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok().
int av_stristart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str independent of case.
int av_sscanf(const char *string, const char *format,...)
See libc sscanf manual for more information.
@ AV_ESCAPE_MODE_QUOTE
Use single-quote escaping.
int av_match_list(const char *name, const char *list, char separator)
Check if a name is in a list.
char * av_strireplace(const char *str, const char *from, const char *to)
Locale-independent strings replace.
size_t static size_t av_strnlen(const char *s, size_t len)
Get the count of continuous non zero chars starting from the beginning.
#define av_printf_format(fmtpos, attrpos)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining list
@ AV_ESCAPE_MODE_AUTO
Use auto-selected escaping mode.
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int av_strncasecmp(const char *a, const char *b, size_t n)
Locale-independent case-insensitive compare.
@ AV_ESCAPE_MODE_XML
Use XML non-markup character data escaping.
static av_const int av_isgraph(int c)
Locale-independent conversion of ASCII isgraph.
static av_const int av_isdigit(int c)
Locale-independent conversion of ASCII isdigit.
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
#define av_warn_unused_result
#define i(width, name, range_min, range_max)
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...) av_printf_format(3
Append output to a string, according to a format.
static av_const int av_toupper(int c)
Locale-independent conversion of ASCII characters to uppercase.
size_t av_strlcat(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,...
char * av_strnstr(const char *haystack, const char *needle, size_t hay_length)
Locate the first occurrence of the string needle in the string haystack where not more than hay_lengt...
char * av_asprintf(const char *fmt,...) av_printf_format(1
Print arguments following specified format into a large enough auto allocated buffer.
char char * av_get_token(const char **buf, const char *term)
Unescape the given string until a non escaped terminating char, and return the token corresponding to...
int av_match_name(const char *name, const char *names)
Match instances of a name in a comma-separated list of names.
@ AV_ESCAPE_MODE_BACKSLASH
Use backslash escaping.
#define flags(name, subs,...)
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
static av_const int av_tolower(int c)
Locale-independent conversion of ASCII characters to lowercase.