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-.\"     $OpenBSD: strtok.3,v 1.24 2024/12/11 23:28:20 jsg Exp $
-.\"
-.\" Copyright (c) 1988, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.Dd $Mdocdate: December 11 2024 $
-.Dt STRTOK 3
-.Os
-.Sh NAME
-.Nm strtok ,
-.Nm strtok_r
-.Nd string token operations
-.Sh SYNOPSIS
-.In string.h
-.Ft char *
-.Fn strtok "char *str" "const char *sep"
-.Ft char *
-.Fn strtok_r "char *str" "const char *sep" "char **last"
-.Sh DESCRIPTION
-.Bf -symbolic
-This interface is obsoleted by
-.Xr strsep 3 .
-.Ef
-.Pp
-The
-.Fn strtok
-function is used to isolate sequential tokens in a NUL-terminated string,
-.Fa str .
-These tokens are separated in the string by at least one of the
-characters in
-.Fa sep .
-The first time that
-.Fn strtok
-is called,
-.Fa str
-should be specified; subsequent calls, wishing to obtain further tokens
-from the same string, should pass a null pointer instead.
-The separator string,
-.Fa sep ,
-must be supplied each time, and may change between calls.
-.Pp
-The
-.Fn strtok_r
-function is a version of
-.Fn strtok
-that takes an explicit context argument and is reentrant.
-.Pp
-Since
-.Fn strtok
-and
-.Fn strtok_r
-modify the string,
-.Fa str
-should not point to an area in the initialized data segment.
-.Sh RETURN VALUES
-The
-.Fn strtok
-and
-.Fn strtok_r
-functions return a pointer to the beginning of each subsequent token
-in the string, after replacing the separator character itself with
-a NUL character.
-When no more tokens remain, a null pointer is returned.
-.Sh EXAMPLES
-The following will construct an array of pointers to each individual word in
-the string
-.Va s :
-.Bd -literal -offset indent
-#define MAXTOKENS       128
-
-char s[512], *p, *tokens[MAXTOKENS];
-char *last;
-int i = 0;
-
-snprintf(s, sizeof(s), "cat dog horse cow");
-
-for ((p = strtok_r(s, " ", &last)); p;
-    (p = strtok_r(NULL, " ", &last))) {
-        if (i < MAXTOKENS - 1)
-                tokens[i++] = p;
-}
-tokens[i] = NULL;
-.Ed
-.Pp
-That is,
-.Li tokens[0]
-will point to
-.Qq cat ,
-.Li tokens[1]
-will point to
-.Qq dog ,
-.Li tokens[2]
-will point to
-.Qq horse ,
-and
-.Li tokens[3]
-will point to
-.Qq cow .
-.Sh SEE ALSO
-.Xr memchr 3 ,
-.Xr strchr 3 ,
-.Xr strcspn 3 ,
-.Xr strpbrk 3 ,
-.Xr strrchr 3 ,
-.Xr strsep 3 ,
-.Xr strspn 3 ,
-.Xr strstr 3 ,
-.Xr wcstok 3
-.Sh STANDARDS
-The
-.Fn strtok
-function conforms to
-.St -ansiC .
-The
-.Fn strtok_r
-function conforms to
-.St -p1003.1-2001 .
-.Sh HISTORY
-The
-.Fn strtok
-function first appeared in
-.At III
-and was reimplemented for
-.Bx 4.3 .
-The
-.Fn strtok_r
-function first appeared in
-.Nx 1.3
-and was reimplemented for
-.Ox 2.7 .
-.Sh BUGS
-The System V
-.Fn strtok ,
-if handed a string containing only delimiter characters,
-will not alter the next starting point, so that a call to
-.Fn 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
-.Dv NULL .