STRTOK(3) BSD Programmer's Manual STRTOK(3)
strtok - string tokens
strtok(char *str, const char *sep);
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 fur-
ther tokens from the same string, should pass a null pointer instead.
The separator string, sep, must be supplied each time, and may change be-
The strtok() function returns a pointer to the beginning of each subse-
quent token in the string, after replacing the token itself with a NUL
character. When no more tokens remain, a null pointer is returned.
index(3), memchr(3), rindex(3), strchr(3), strcspn(3), strpbrk(3),
strrchr(3), strsep(3), strspn(3), strstr(3)
The strtok() function conforms to ANSI C X3.159-1989 (``ANSI C '').
There is no way to get tokens from multiple strings simultaneously.
The System V strtok(), if handed a string containing only delimiter char-
acters, 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.
3rd Berkeley Distribution February 3, 1994 1