strtok

STRTOK(3)		  Linux Programmer’s Manual		    STRTOK(3)



NAME
       strtok, strtok_r - extract tokens from strings

SYNOPSIS
       #include <string.h>

       char *strtok(char *s, const char *delim);

       char *strtok_r(char *s, const char *delim, char **ptrptr);

DESCRIPTION
       A  ‘token’  is  a  nonempty  string of characters not occurring in the
       string delim, followed by \0 or by a character occurring in delim.

       The strtok() function can be used to parse the string s	into  tokens.
       The first call to strtok() should have s as its first argument. Subse-
       quent calls should have the first argument  set	to  NULL.  Each	 call
       returns	a  pointer to the next token, or NULL when no more tokens are
       found.

       If a token ends with a delimiter, this delimiting character  is	over-
       written with a \0 and a pointer to the next character is saved for the
       next call to strtok().  The delimiter string delim  may	be  different
       for each call.

       The  strtok_r()	function is a reentrant version of the strtok() func-
       tion, which instead of using its own static buffer, requires a pointer
       to a user allocated char*. This pointer, the ptrptr parameter, must be
       the same while parsing the same string.

BUGS
       Never use these functions. If you do, note that:

	      These functions modify their first argument.

	      These functions cannot be used on constant strings.

	      The identity of the delimiting character is lost.

	      The strtok() function uses a static buffer  while	 parsing,  so
	      it’s not thread safe. Use strtok_r() if this matters to you.

RETURN VALUE
       The  strtok() function returns a pointer to the next token, or NULL if
       there are no more tokens.

CONFORMING TO
       strtok()
	      SVID 3, POSIX, BSD 4.3, ISO 9899

       strtok_r()
	      POSIX.1c

SEE ALSO
       index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strsep(3), str-
       spn(3), strstr(3)



GNU				  2000-02-13			    STRTOK(3)