1 files changed, 51 insertions, 0 deletions
diff --git a/libiberty/strstr.c b/libiberty/strstr.c
new file mode 100644
index 00000000000..fab36e3fb3d
--- /dev/null
+++ b/libiberty/strstr.c
@@ -0,0 +1,51 @@
+/* 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);
+}