Initial revision

svn path=/trunk/; revision=3507

1 files changed, 70 insertions, 0 deletions

diff --git a/strstr.c b/strstr.c
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+/*
+ * strstr.c -- return the offset of one string within another.
+ *
+ * Copyright (C) 1997 Free Software Foundation, Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2, or (at your option) any later
+ * version. 
+ *
+ * This program 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 General Public License for
+ * more details. 
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.  
+ */
+
+/* Written by Philippe De Muyter <phdm@info.ucl.ac.be>.  */
+
+/*
+ * NAME 
+ *
+ * strstr -- locate first occurence of a substring 
+ *
+ * SYNOPSIS 
+ *
+ * char *strstr (char *s1, char *s2) 
+ *
+ * DESCRIPTION 
+ *
+ * Locates the first occurence in the string pointed to by S1 of the string
+ * pointed to by S2.  Returns a pointer to the substring found, or a NULL
+ * pointer if not found.  If S2 points to a string with zero length, the
+ * function returns S1. 
+ *
+ * BUGS 
+ *
+ */
+
+char *
+strstr (buf, sub)
+     register char *buf;
+     register char *sub;
+{
+  register char *bp;
+
+  if (!*sub)
+    return buf;
+  for (;;)
+    {
+      if (!*buf)
+	break;
+      bp = buf;
+      for (;;)
+	{
+	  if (!*sub)
+	    return buf;
+	  if (*bp++ != *sub++)
+	    break;
+	}
+      sub -= (unsigned long) bp;
+      sub += (unsigned long) buf;
+      buf += 1;
+    }
+  return 0;
+}
+