1 files changed, 93 insertions, 0 deletions
diff --git a/usr.bin/grep/binary.c b/usr.bin/grep/binary.c
new file mode 100644
index 0000000..119c946
--- /dev/null
+++ b/usr.bin/grep/binary.c
@@ -0,0 +1,93 @@
+/*	$OpenBSD: binary.c,v 1.19 2021/03/10 21:55:22 millert Exp $	*/
+
+/*-
+ * 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.
+ */
+
+#include <ctype.h>
+#include <err.h>
+#include <stdio.h>
+#include <string.h>
+#include <zlib.h>
+
+#include "grep.h"
+
+static int
+isbinary(const char *buf, size_t n)
+{
+	return (memchr(buf, '\0', n) != NULL);
+}
+
+int
+bin_file(FILE *f)
+{
+	char		buf[BUFSIZ];
+	size_t		m;
+	int		ret = 0;
+
+	if (fseek(f, 0L, SEEK_SET) == -1)
+		return 0;
+
+	if ((m = fread(buf, 1, BUFSIZ, f)) == 0)
+		return 0;
+
+	if (isbinary(buf, m))
+		ret = 1;
+
+	rewind(f);
+	return ret;
+}
+
+#ifndef NOZ
+int
+gzbin_file(gzFile f)
+{
+	char		buf[BUFSIZ];
+	int		m;
+	int		ret = 0;
+
+	if (gzseek(f, (z_off_t)0, SEEK_SET) == -1)
+		return 0;
+
+	if ((m = gzread(f, buf, BUFSIZ)) <= 0)
+		return 0;
+
+	if (isbinary(buf, m))
+		ret = 1;
+
+	if (gzrewind(f) != 0)
+		err(1, "gzbin_file");
+	return ret;
+}
+#endif
+
+#ifndef SMALL
+int
+mmbin_file(mmf_t *f)
+{
+	/* XXX knows too much about mmf internals */
+	return isbinary(f->base, f->len < BUFSIZ ? f->len : BUFSIZ);
+}
+#endif