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+/* Simple implementation of strstr for systems without it.
+ This function is in the public domain. */
+
+/*
+
+NAME
+
+ strstr -- locate first occurance of a substring
+
+SYNOPSIS
+
+ #include <string.h>
+
+ char *strstr (char *s1, char *s2)
+
+DESCRIPTION
+
+ Locates the first occurance 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
+
+*/
+
+
+/* FIXME: The above description is ANSI compiliant. This routine has not
+ been validated to comply with it. -fnf */
+
+char *
+strstr (s1, s2)
+ char *s1, *s2;
+{
+ register char *p = s1;
+ extern char *strchr ();
+ extern int strncmp ();
+#if __GNUC__==2
+ extern __SIZE_TYPE__ strlen ();
+#endif
+ register int len = strlen (s2);
+
+ for (; (p = strchr (p, *s2)) != 0; p++)
+ {
+ if (strncmp (p, s2, len) == 0)
+ {
+ return (p);
+ }
+ }
+ return (0);
+}