Initial revision

1 files changed, 54 insertions, 0 deletions

diff --git a/libc/string/strstr.c b/libc/string/strstr.c
new file mode 100644
index 000000000..aafcaf967
--- /dev/null
+++ b/libc/string/strstr.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
+ * This file is part of the Linux-8086 C library and is distributed
+ * under the GNU Library General Public License.
+ */
+
+#include <string.h>
+
+#if 1
+/* We've now got a nice fast strchr and memcmp use them */
+
+char *
+strstr(s1, s2)
+char *s1; char *s2;
+{
+   register int l = strlen(s2);
+   register char * p = s1;
+
+   if( l==0 ) return p;
+
+   while (p = strchr(p, *s2))
+   {
+      if( memcmp(p, s2, l) == 0 )
+         return p;
+      p++;
+   }
+   return (char *) 0;
+}
+
+#else
+/* This is a nice simple self contained strstr,
+   now go and work out why the GNU one is faster :-) */
+
+char *strstr(str1, str2)
+char *str1, *str2;
+{
+    register char *Sptr, *Tptr;
+    int	len = strlen(str1) -strlen(str2) + 1;
+
+    if (*str2)
+	for (; len > 0;	len--, str1++){
+	    if (*str1 != *str2)
+		continue;
+
+	    for	(Sptr =	str1, Tptr = str2; *Tptr != '\0'; Sptr++, Tptr++)
+		if (*Sptr != *Tptr)
+		    break;
+
+	    if (*Tptr == '\0')
+		return (char*) str1;
+	}
+
+    return (char*)0;
+}
+#endif