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Name strtok, strtok_r - extract tokens from strings Synopsis #include <string.h> char *strtok(char *s, const char *delim); char *strtok_r(char *s, const char *delim, char **ptrptr); Description A `token' is a nonempty string of characters not occurring in the string delim, followed by \0 or by a character occurring in delim. The strtok() function can be used to parse the string s into tokens. The first call to strtok() should have s as its first argument. Subsequent calls should have the first argument set to NULL. Each call returns a pointer to the next token, or NULL when no more tokens are found. If a token ends with a delimiter, this delimiting character is overwritten with a \0 and a pointer to the next character is saved for the next call to strtok(). The delimiter string delim may be different for each call. The strtok_r() function is a reentrant version of the strtok() function, which instead of using its own static buffer, requires a pointer to a user allocated char*. This pointer, the ptrptr parameter, must be the same while parsing the same string. Bugs Never use these functions. If you do, note that: These functions modify their first argument. These functions cannot be used on constant strings. The identity of the delimiting character is lost. The strtok() function uses a static buffer while parsing, so it's not thread safe. Use strtok_r() if this matters to you. Return Value The strtok() function returns a pointer to the next token, or NULL if there are no more tokens. Conforming to strtok() SVID 3, POSIX, BSD 4.3, ISO 9899 strtok_r() POSIX.1c See Also index(3) , memchr(3) , rindex(3) , strchr(3) , strpbrk(3) , strsep(3) , strspn(3) , strstr(3)

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