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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /string/strtok.c
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initial import
Diffstat (limited to 'string/strtok.c')
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1 files changed, 73 insertions, 0 deletions
diff --git a/string/strtok.c b/string/strtok.c
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+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <string.h>
+
+
+static char *olds = NULL;
+
+/* Parse S into tokens separated by characters in DELIM.
+ If S is NULL, the last string strtok() was called with is
+ used. For example:
+ char s[] = "-abc=-def";
+ x = strtok(s, "-"); // x = "abc"
+ x = strtok(NULL, "=-"); // x = "def"
+ x = strtok(NULL, "="); // x = NULL
+ // s = "abc\0-def\0"
+*/
+char *
+DEFUN(strtok, (s, delim),
+ register char *s AND register CONST char *delim)
+{
+ char *token;
+
+ if (s == NULL)
+ {
+ if (olds == NULL)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+ else
+ s = olds;
+ }
+
+ /* Scan leading delimiters. */
+ s += strspn(s, delim);
+ if (*s == '\0')
+ {
+ olds = NULL;
+ return NULL;
+ }
+
+ /* Find the end of the token. */
+ token = s;
+ s = strpbrk(token, delim);
+ if (s == NULL)
+ /* This token finishes the string. */
+ olds = NULL;
+ else
+ {
+ /* Terminate the token and make OLDS point past it. */
+ *s = '\0';
+ olds = s + 1;
+ }
+ return token;
+}