From 01c165cd1b2ac601d5ae73d3cb5e82ccdd94ac94 Mon Sep 17 00:00:00 2001
From: Le Chi Thu <thu2004@yahoo.se>
Date: Tue, 3 Apr 2012 01:23:00 +0200
Subject: Initial commit

---
 ltp_framework/lib/pattern.c | 168 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 ltp_framework/lib/pattern.c

(limited to 'ltp_framework/lib/pattern.c')

diff --git a/ltp_framework/lib/pattern.c b/ltp_framework/lib/pattern.c
new file mode 100644
index 0000000..fc59d9b
--- /dev/null
+++ b/ltp_framework/lib/pattern.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
+ */
+#include <string.h>
+#include "pattern.h"
+
+/*
+ * The routines in this module are used to fill/check a data buffer
+ * with/against a known pattern.
+ */
+
+int
+pattern_check(buf, buflen, pat, patlen, patshift)
+char	*buf;
+int	buflen;
+char	*pat;
+int	patlen;
+int	patshift;
+{
+    int		nb, ncmp, nleft;
+    char	*cp;
+
+    if (patlen)
+	patshift = patshift % patlen;
+
+    cp = buf;
+    nleft = buflen;
+
+    /*
+     * The following 2 blocks of code are to compare the first patlen
+     * bytes of buf.  We need 2 checks if patshift is > 0 since we
+     * must check the last (patlen - patshift) bytes, and then the
+     * first (patshift) bytes.
+     */
+
+    nb = patlen - patshift;
+    if (nleft < nb) {
+	return (memcmp(cp, pat + patshift, nleft) ? -1 : 0);
+    } else {
+        if (memcmp(cp, pat + patshift, nb))
+	    return -1;
+
+	nleft -= nb;
+	cp += nb;
+    }
+
+    if (patshift > 0) {
+	nb = patshift;
+	if (nleft < nb) {
+	    return (memcmp(cp, pat, nleft) ? -1 : 0);
+	} else {
+	    if (memcmp(cp, pat, nb))
+		return -1;
+
+	    nleft -= nb;
+	    cp += nb;
+	}
+    }
+
+    /*
+     * Now, verify the rest of the buffer using the algorithm described
+     * in the function header.
+     */
+
+    ncmp = cp - buf;
+    while (ncmp < buflen) {
+	nb = (ncmp < nleft) ? ncmp : nleft;
+	if (memcmp(buf, cp, nb))
+	    return -1;
+
+	cp += nb;
+	ncmp += nb;
+	nleft -= nb;
+    }
+
+    return 0;
+}
+
+int
+pattern_fill(buf, buflen, pat, patlen, patshift)
+char	*buf;
+int	buflen;
+char	*pat;
+int	patlen;
+int	patshift;
+{
+    int		trans, ncopied, nleft;
+    char	*cp;
+
+    if (patlen)
+	patshift = patshift % patlen;
+
+    cp = buf;
+    nleft = buflen;
+
+    /*
+     * The following 2 blocks of code are to fill the first patlen
+     * bytes of buf.  We need 2 sections if patshift is > 0 since we
+     * must first copy the last (patlen - patshift) bytes into buf[0]...,
+     * and then the first (patshift) bytes of pattern following them.
+     */
+
+    trans = patlen - patshift;
+    if (nleft < trans) {
+	memcpy(cp, pat + patshift, nleft);
+	return 0;
+    } else {
+	memcpy(cp, pat + patshift, trans);
+	nleft -= trans;
+	cp += trans;
+    }
+
+    if (patshift > 0) {
+        trans = patshift;
+	if (nleft < trans) {
+	    memcpy(cp, pat, nleft);
+	    return 0;
+	} else {
+	    memcpy(cp, pat, trans);
+	    nleft -= trans;
+	    cp += trans;
+	}
+    }
+
+    /*
+     * Now, fill the rest of the buffer using the algorithm described
+     * in the function header comment.
+     */
+
+    ncopied = cp - buf;
+    while (ncopied < buflen) {
+	trans = (ncopied < nleft) ? ncopied : nleft;
+	memcpy(cp, buf, trans);
+	cp += trans;
+	ncopied += trans;
+	nleft -= trans;
+    }
+
+    return(0);
+}
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