Initial revision

1 files changed, 68 insertions, 0 deletions

diff --git a/compat/strstr.c b/compat/strstr.c
new file mode 100644
index 0000000..59296db
--- /dev/null
+++ b/compat/strstr.c
@@ -0,0 +1,68 @@
+/* 
+ * strstr.c --
+ *
+ *	Source code for the "strstr" library routine.
+ *
+ * Copyright (c) 1988-1993 The Regents of the University of California.
+ * Copyright (c) 1994 Sun Microsystems, Inc.
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * SCCS: @(#) strstr.c 1.4 96/02/15 12:08:22
+ */
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * strstr --
+ *
+ *	Locate the first instance of a substring in a string.
+ *
+ * Results:
+ *	If string contains substring, the return value is the
+ *	location of the first matching instance of substring
+ *	in string.  If string doesn't contain substring, the
+ *	return value is 0.  Matching is done on an exact
+ *	character-for-character basis with no wildcards or special
+ *	characters.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+char *
+strstr(string, substring)
+    register char *string;	/* String to search. */
+    char *substring;		/* Substring to try to find in string. */
+{
+    register char *a, *b;
+
+    /* First scan quickly through the two strings looking for a
+     * single-character match.  When it's found, then compare the
+     * rest of the substring.
+     */
+
+    b = substring;
+    if (*b == 0) {
+	return string;
+    }
+    for ( ; *string != 0; string += 1) {
+	if (*string != *b) {
+	    continue;
+	}
+	a = string;
+	while (1) {
+	    if (*b == 0) {
+		return string;
+	    }
+	    if (*a++ != *b++) {
+		break;
+	    }
+	}
+	b = substring;
+    }
+    return (char *) 0;
+}