From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- string/strtok.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 string/strtok.c (limited to 'string/strtok.c') diff --git a/string/strtok.c b/string/strtok.c new file mode 100644 index 0000000000..0b95084f53 --- /dev/null +++ b/string/strtok.c @@ -0,0 +1,73 @@ +/* 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 +#include +#include + + +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; +} -- cgit v1.2.1