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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-ter-minated null-terminated
     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 further
     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: contexts:
     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'').

BUGS
     The System V strtok(), if handed a string containing only delimiter char-acters, characters,
     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 starting
     ing point, such a sequence of calls would always return NULL.

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

     Based on the FreeBSD 3.0 implementation.

BSD                            November 27, 1998                           BSD