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STRTOK(3)	       FreeBSD Library Functions Manual		     STRTOK(3)

NAME
     strtok, strtok_r -- string	tokens

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <string.h>

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

     char *
     strtok_r(char *str, const char *sep, char **last);

DESCRIPTION
     This 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 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
     between calls.

     The implementation	will behave as if no library function calls strtok().

     The strtok_r() function is	a reentrant version of strtok().  The context
     pointer last must be provided on each call.  The strtok_r() function may
     also be used to nest two parsing loops within one another,	as long	as
     separate context pointers are used.

     The strtok() and strtok_r() functions return 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.

EXAMPLES
     The following uses	strtok_r() to parse two	strings	using separate con-
     texts:

     char test[80], blah[80];
     char *sep = "\\/:;=-";
     char *word, *phrase, *brkt, *brkb;

     strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");

     for (word = strtok_r(test,	sep, &brkt);
	  word;
	  word = strtok_r(NULL,	sep, &brkt))
     {
	 strcpy(blah, "blah:blat:blab:blag");

	 for (phrase = strtok_r(blah, sep, &brkb);
	      phrase;
	      phrase = strtok_r(NULL, sep, &brkb))
	 {
	     printf("So	far we're at %s:%s\n", word, phrase);
	 }
     }

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

STANDARDS
     The strtok() function conforms to ISO/IEC 9899:1990 (``ISO	C90'').

AUTHORS
     Wes Peters, Softweyr LLC: <wes@softweyr.com>

     Based on the FreeBSD 3.0 implementation.

BUGS
     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 start-
     ing point,	such a sequence	of calls would always return NULL.

FreeBSD	10.1		       November	27, 1998		  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | STANDARDS | AUTHORS | BUGS

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