STRTOK(3)

NAME
strtok - string tokens

SYNOPSIS
#include <string.h>

char *
strtok(str, sep)
char *str;
char *sep;

DESCRIPTION
This interface is obsoleted by strsep(3).

The strtok() function is used to isolate sequential tokens in a null-terminated string, str . These tokens are separated in the string by at least one of the characters in sep . The first time that strtok() is called, str should be specified; subsequent calls, wishing to obtain further tokens from the same string, should pass a null pointer instead. The separator string, sep , must be supplied each time, and may change between calls.

The strtok() function returns a pointer to the beginning of each subsequent token in the string, after replacing the token itself with a NUL character. When no more tokens remain, a null pointer is returned.

SEE ALSO
index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3

STANDARDS
The strtok() function conforms to ANSI C X3.159-1989 (``ANSI C'').

BUGS
There is no way to get tokens from multiple strings simultaneously.

The System V strtok(), if handed a string containing only delimiter characters, will not alter the next starting point, so that a call to strtok() with a different (or empty) delimiter string may return a non-NULL value. Since this implementation always alters the next starting point, such a sequence of calls would always return NULL.