From fff11f1ab7ec7cc67087231361f3bde8ecff115f Mon Sep 17 00:00:00 2001
From: Glenn L McGrath <bug1@ihug.co.nz>
Date: Sun, 18 Nov 2001 14:20:25 +0000
Subject: [PATCH] bzcat and bunzip -c support from Thomas Lundquist

---
 archival/bunzip2.c | 38 ++++++++++++++++++++++++++++++++++----
 include/applets.h  |  3 +++
 include/usage.h    |  8 +++++++-
 3 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/archival/bunzip2.c b/archival/bunzip2.c
index da9808e82..290681dd3 100644
--- a/archival/bunzip2.c
+++ b/archival/bunzip2.c
@@ -1,4 +1,5 @@
 /* Modified for busybox by Glenn McGrath <bug1@optushome.com.au> */
+/* Added support output to stdout by Thomas Lundquist <thomasez@zelow.no> */ 
 /*--
   This file is a part of bzip2 and/or libbzip2, a program and
   library for lossless, block-sorting data compression.
@@ -56,6 +57,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <getopt.h>
 #include <busybox.h>
 
 //#define TRUE 1
@@ -2316,15 +2318,38 @@ errhandler_io:
 
 int bunzip2_main(int argc, char **argv)
 {
+	const int bunzip_to_stdout = 1;
+	int flags = 0;
+	int opt = 0;
+
 	FILE *src_stream;
 	FILE *dst_stream;
 	char *save_name;
 	char *save_name_ptr;
-	if (argc != 2) {
+
+	/* if called as bzcat */
+	if (strcmp(applet_name, "bzcat") == 0)
+		flags |= bunzip_to_stdout;
+
+	while ((opt = getopt(argc, argv, "ch")) != -1) {
+		switch (opt) {
+		case 'c':
+			flags |= bunzip_to_stdout;
+			break;
+		case 'h':
+		default:
+			show_usage(); /* exit's inside usage */
+		}
+	}
+
+	save_name = xstrdup(argv[optind]);
+		
+	if (save_name == NULL) {
 		show_usage();
 	}
-	src_stream = xfopen(argv[1], "r");
-	save_name = xstrdup(argv[1]);
+
+	src_stream = xfopen(argv[optind], "r");
+
 	save_name_ptr = strrchr(save_name, '.');
 	if (save_name_ptr == NULL) {
 		return(FALSE);
@@ -2333,7 +2358,12 @@ int bunzip2_main(int argc, char **argv)
 		error_msg("Invalid extension, expected .bz2");
 	}
 	*save_name_ptr = '\0';	
-	dst_stream = xfopen(save_name, "w");
+
+	if (flags & bunzip_to_stdout) {
+		dst_stream = stdout;
+	} else {
+		dst_stream = xfopen(save_name, "w");
+	}
 	uncompressStream(src_stream, dst_stream);
 
 	return(TRUE);
diff --git a/include/applets.h b/include/applets.h
index ea196cb66..aa112c30b 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -68,6 +68,9 @@
 	APPLET(bunzip2, bunzip2_main, _BB_DIR_USR_BIN)
 #endif
 	APPLET_NOUSAGE("busybox", busybox_main, _BB_DIR_BIN)
+#ifdef CONFIG_BUNZIP2
+	APPLET(bzcat, bunzip2_main, _BB_DIR_USR_BIN)
+#endif
 #ifdef CONFIG_CAT
 	APPLET(cat, cat_main, _BB_DIR_BIN)
 #endif
diff --git a/include/usage.h b/include/usage.h
index 12d5e1ed5..df1c18ec7 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -52,11 +52,17 @@
 	"bar"
 
 #define bunzip2_trivial_usage \
-	"FILE"
+	"[-c] FILE"
 #define bunzip2_full_usage \
 	"Uncompress FILE to current directory, stripping its .bz2 extension.\n"\
+	" -c output to stdout\n"\
 	" -k is assumed" 
 
+#define bzcat_trivial_usage \
+	"FILE"
+#define bzcat_full_usage \
+	"Uncompress to stdout."
+
 #define cat_trivial_usage \
 	"[FILE]..."
 #define cat_full_usage \