added portability to non-BSD systems

lib/utils/strsep_gnu.c

@@ -0,0 +1,36 @@
+/* Copyright (C) 1992-2019 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+#include <string.h>
+#include <strsep_gnu.h>
+
+char *
+strsep_gnu (char **stringp, const char *delim)
+{
+  char *begin, *end;
+  begin = *stringp;
+  if (begin == NULL)
+    return NULL;
+  /* Find the end of the token.  */
+  end = begin + strcspn (begin, delim);
+  if (*end)
+    {
+      /* Terminate the token and set *STRINGP past NUL character.  */
+      *end++ = '\0';
+      *stringp = end;
+    }
+  else
+    /* No more delimiters; this is the last token.  */
+    *stringp = NULL;
+  return begin;
+}