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

     strtok, strtok_r — string tokens

     Standard C Library (libc, -lc)

     #include <string.h>

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

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

     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

     The following uses strtok_r() to parse two strings using separate con‐

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

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

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

     The strtok() function conforms to ISO/IEC 9899:1990 (“ISO C90”).

     Wes Peters, Softweyr LLC: ⟨⟩

     Based on the FreeBSD 3.0 implementation.

     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.

BSD			       November 27, 1998			   BSD

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