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BSD 2.11 - man page for strtok (bsd section 3)

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STRTOK(3)										STRTOK(3)

       strtok - string tokens

       #include <string.h>

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

       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  strtok()  function returns 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.

       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 C X3.159-1989 (``ANSI C'').

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

       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.

4.4 Berkeley Distribution		 January 12, 1996				STRTOK(3)
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