STRTOK man page on 4.4BSD

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

     strtok — string tokens

     #include <string.h>

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

     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 strtok() function returns a pointer to the beginning of each subse‐
     quent token in the string, after replacing the token itself with a NUL
     character.	 When no more tokens remain, a null pointer is returned.

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

     The strtok() function conforms to ANSI X3.159-1989 (“ANSI C89”).

     There is no way to get tokens from multiple strings simultaneously.

     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.

3rd Berkeley Distribution      February 3, 1994	     3rd Berkeley Distribution

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