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| int | av_strstart (const char *str, const char *pfx, const char **ptr) | 
|  | Return non-zero if pfx is a prefix of str. 
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| 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. 
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| char * | av_stristr (const char *haystack, const char *needle) | 
|  | Locate the first case-independent occurrence in the string haystack of the string needle. 
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| 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_length characters are searched. 
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| 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. 
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| 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, and null-terminate dst. 
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| 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. 
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| 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. 
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| char * | av_asprintf (const char *fmt,...) av_printf_format(1 | 
|  | Print arguments following specified format into a large enough auto allocated buffer. 
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| char char * | av_d2str (double d) | 
|  | Convert a number to a av_malloced string. 
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| 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 the unescaped string. 
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| 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(). 
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| av_const int | av_isdigit (int c) | 
|  | Locale-independent conversion of ASCII isdigit. 
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| av_const int | av_isgraph (int c) | 
|  | Locale-independent conversion of ASCII isgraph. 
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| av_const int | av_isspace (int c) | 
|  | Locale-independent conversion of ASCII isspace. 
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| static av_const int | av_toupper (int c) | 
|  | Locale-independent conversion of ASCII characters to uppercase. 
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| static av_const int | av_tolower (int c) | 
|  | Locale-independent conversion of ASCII characters to lowercase. 
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| av_const int | av_isxdigit (int c) | 
|  | Locale-independent conversion of ASCII isxdigit. 
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| int | av_strcasecmp (const char *a, const char *b) | 
|  | Locale-independent case-insensitive compare. 
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| int | av_strncasecmp (const char *a, const char *b, size_t n) | 
|  | Locale-independent case-insensitive compare. 
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| const char * | av_basename (const char *path) | 
|  | Thread safe basename. 
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| const char * | av_dirname (char *path) | 
|  | Thread safe dirname. 
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| int | av_match_name (const char *name, const char *names) | 
|  | Match instances of a name in a comma-separated list of names. 
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| 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 with av_free(). 
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| 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 point to the next byte to decode. 
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| int | av_match_list (const char *name, const char *list, char separator) | 
|  | Check if a name is in a list. 
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