Copyright (c) 1988 The Regents of the University of California.
All rights reserved.

Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation,
advertising materials, and other materials related to such
distribution and use acknowledge that the software was developed
by the University of California, Berkeley. The name of the
University may not be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

@(#)strtok.3 5.2 (Berkeley) 03/11/89

C 3 strtok, strsep - string token operations

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

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

Strtok is used to isolate sequential tokens in a null-terminated string, str . These tokens are separated in the string by "one or more" 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. Strtok returns a pointer to the start 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.

Strsep behaves similarly to strtok with the exception that the tokens in the string are separated by single occurrences of separator characters. This routine was added to allow handling blank fields.

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

Strsep is used heavily in the C library; calls to it and calls to the C library should not be intermixed.