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74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
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/* Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <string.h>
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static char *olds = NULL;
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/* Parse S into tokens separated by characters in DELIM.
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If S is NULL, the last string strtok() was called with is
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used. For example:
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char s[] = "-abc=-def";
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x = strtok(s, "-"); // x = "abc"
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x = strtok(NULL, "=-"); // x = "def"
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x = strtok(NULL, "="); // x = NULL
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// s = "abc\0-def\0"
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*/
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char *
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DEFUN(strtok, (s, delim),
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register char *s AND register CONST char *delim)
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{
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char *token;
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if (s == NULL)
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{
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if (olds == NULL)
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{
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errno = EINVAL;
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return NULL;
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}
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else
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s = olds;
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}
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/* Scan leading delimiters. */
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s += strspn(s, delim);
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if (*s == '\0')
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{
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olds = NULL;
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return NULL;
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}
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/* Find the end of the token. */
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token = s;
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s = strpbrk(token, delim);
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if (s == NULL)
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/* This token finishes the string. */
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olds = NULL;
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else
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{
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/* Terminate the token and make OLDS point past it. */
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*s = '\0';
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olds = s + 1;
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}
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return token;
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}
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