strtok(3) [osx man page]

STRTOK(3)						   BSD Library Functions Manual 						 STRTOK(3)

NAME

     strtok, strtok_r -- string tokens

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <string.h>

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

     char *
     strtok_r(char *restrict str, const char *restrict sep, char **restrict lasts);

DESCRIPTION

     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
     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 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 contexts:

     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
", 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 characters, 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.

BSD
								 November 27, 1998							       BSD

Check Out this Related Man Page

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  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 overwritten with a  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() function, 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), strspn(3), strstr(3)

GNU
								    2000-02-13								 STRTOK(3)

Linux and UNIX Man Pages

strtok(3) [osx man page]

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