1 files changed, 60 insertions, 0 deletions
diff --git a/src/strstr.c b/src/strstr.c
new file mode 100644
index 00000000..7dcd7d56
--- /dev/null
+++ b/src/strstr.c
@@ -0,0 +1,60 @@
+/*
+ * 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@macqel.be>.  */
+
+/*
+ * NAME
+ *
+ * strstr -- locate first occurrence of a substring
+ *
+ * SYNOPSIS
+ *
+ * char *strstr (char *s1, char *s2)
+ *
+ * DESCRIPTION
+ *
+ * Locates the first occurrence 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(char *buf, char *sub)
+{
+    register char *bp;
+    register char *sp;
+
+    if (!*sub)
+	return buf;
+    while (*buf) {
+	bp = buf;
+	sp = sub;
+	do {
+	    if (!*sp)
+		return buf;
+	} while (*bp++ == *sp++);
+	buf += 1;
+    }
+    return 0;
+}