STRTOK(3) BSD Programmer's Manual STRTOK(3)NAME
strtok, strtok_r - string tokens
SYNOPSIS
#include <string.h>
char *
strtok(char *str, const char *sep);
char *
strtok_r(char *str, const, char, *sep", char **state);
DESCRIPTION
The strtok() interface is obsoleted by strsep(3).
The strtok() function is used to isolate sequential tokens in a null-ter-
minated 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 subse-
quent token in the string, after replacing the separator character itself
with a NUL character. When no more tokens remain, a null pointer is re-
turned.
The strtok_r() function is a reentrant version of the traditional
strtok() function. Instead of using a hidden state variable, the caller
must supply the address of a variable state of type char *. This state
variable is initialized from any non-NULL str argument and used to con-
tinue processing whenever the caller supplies NULL. (This function, which
simply exposes the previously-hidden state variable of strtok(), is just
a clumsy way of obtaining half of the functionality of strsep().)
SEE ALSOindex(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 '').
The strtok_r() function conforms to IEEE Std1003.1-1996 (``POSIX'').
BUGS
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