1 files changed, 88 insertions, 0 deletions
diff --git a/usr.bin/grep/binary.c b/usr.bin/grep/binary.c
new file mode 100644
index 00000000000..a7071d505bd
--- /dev/null
+++ b/usr.bin/grep/binary.c
@@ -0,0 +1,88 @@
+/*-
+ * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$Id: binary.c,v 1.1 2003/06/22 22:20:07 deraadt Exp $
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <zlib.h>
+
+#include "grep.h"
+
+#define BUFFER_SIZE 32
+
+int
+bin_file(FILE *f)
+{
+	char		buf[BUFFER_SIZE];
+	int		i, m;
+
+	if (fseek(f, SEEK_SET, 0) == -1)
+		return 0;
+
+	if ((m = (int)fread(buf, 1, BUFFER_SIZE, f)) == 0)
+		return 0;
+
+	for (i = 0; i < m; i++)
+		if (!isprint(buf[i]) && !isspace(buf[i]))
+			return 1;
+
+	rewind(f);
+	return 0;
+}
+
+int
+gzbin_file(gzFile *f)
+{
+	char		buf[BUFFER_SIZE];
+	int		i, m;
+
+	if (gzseek(f, SEEK_SET, 0) == -1)
+		return 0;
+
+	if ((m = (int)gzread(f, buf, BUFFER_SIZE)) == 0)
+		return 0;
+
+	for (i = 0; i < m; i++)
+		if (!isprint(buf[i]))
+			return 1;
+
+	gzrewind(f);
+	return 0;
+}
+
+int
+mmbin_file(mmf_t *f)
+{
+	int i;
+	
+	/* XXX knows too much about mmf internals */
+	for (i = 0; i < BUFFER_SIZE && i < f->len; i++)
+		if (!isprint(f->base[i]))
+			return 1;
+	mmrewind(f);
+	return 0;
+}