flash_eraseall: tweaks to make binary size smaller

Returning from main() instead of using exit() makes code more readable
and smaller (ARM EABI binary sizes)

   text    data     bss     dec     hex filename
  28882     436      44   29362    72b2 flash_eraseall
  28827     432      44   29303    7277 flash_eraseall.noexit

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 89 insertions, 104 deletions

diff --git a/flash_eraseall.c b/flash_eraseall.c
index a2a6b0a..5740719 100644
--- a/flash_eraseall.c
+++ b/flash_eraseall.c
@@ -47,24 +47,107 @@
 static const char *exe_name;
 static const char *mtd_device;
 static int quiet;		/* true -- don't output progress */
-static int jffs2;		// format for jffs2 usage
+static int jffs2;		/* format for jffs2 usage */
 
-static void process_options (int argc, char *argv[]);
-void show_progress (struct mtd_dev_info *mtd, uint64_t start);
-static void display_help (void);
-static void display_version (void);
 static struct jffs2_unknown_node cleanmarker;
 int target_endian = __BYTE_ORDER;
 
+static void show_progress (struct mtd_dev_info *mtd, uint64_t start)
+{
+	printf("\rErasing %d Kibyte @ %llx -- %2llu %% complete.",
+		mtd->eb_size / 1024, (unsigned long long)start,
+		(unsigned long long) start * 100 / mtd->size);
+	fflush(stdout);
+}
+
+static void display_help (void)
+{
+	printf("Usage: %s [OPTION] MTD_DEVICE\n"
+			"Erases all of the specified MTD device.\n"
+			"\n"
+			"  -j, --jffs2    format the device for jffs2\n"
+			"  -q, --quiet    don't display progress messages\n"
+			"      --silent   same as --quiet\n"
+			"      --help     display this help and exit\n"
+			"      --version  output version information and exit\n",
+			exe_name);
+}
+
+
+static void display_version (void)
+{
+	printf(PROGRAM " " VERSION "\n"
+			"\n"
+			"Copyright (C) 2000 Arcom Control Systems Ltd\n"
+			"\n"
+			PROGRAM " comes with NO WARRANTY\n"
+			"to the extent permitted by law.\n"
+			"\n"
+			"You may redistribute copies of " PROGRAM "\n"
+			"under the terms of the GNU General Public Licence.\n"
+			"See the file `COPYING' for more information.\n");
+}
+
 int main (int argc, char *argv[])
 {
 	libmtd_t mtd_desc;
 	struct mtd_dev_info mtd;
 	int fd, clmpos = 0, clmlen = 8, eb;
 	int isNAND, bbtest = 1;
+	int error = 0;
 	uint64_t offset = 0;
 
-	process_options(argc, argv);
+	exe_name = argv[0];
+	for (;;) {
+		int option_index = 0;
+		static const char *short_options = "jq";
+		static const struct option long_options[] = {
+			{"help", no_argument, 0, 0},
+			{"version", no_argument, 0, 0},
+			{"jffs2", no_argument, 0, 'j'},
+			{"quiet", no_argument, 0, 'q'},
+			{"silent", no_argument, 0, 'q'},
+
+			{0, 0, 0, 0},
+		};
+
+		int c = getopt_long(argc, argv, short_options,
+				long_options, &option_index);
+		if (c == EOF)
+			break;
+
+		switch (c) {
+		case 0:
+			switch (option_index) {
+			case 0:
+				display_help();
+				return 0;
+			case 1:
+				display_version();
+				return 0;
+			}
+			break;
+		case 'q':
+			quiet = 1;
+			break;
+		case 'j':
+			jffs2 = 1;
+			break;
+		case '?':
+			error = 1;
+			break;
+		}
+	}
+	if (optind == argc) {
+		fprintf(stderr, "%s: no MTD device specified\n", exe_name);
+		error = 1;
+	}
+	if (error) {
+		fprintf(stderr, "Try `%s --help' for more information.\n",
+				exe_name);
+		return 1;
+	}
+	mtd_device = argv[optind];
 
 	mtd_desc = libmtd_open();
 	if (mtd_desc == NULL) {
@@ -191,101 +274,3 @@ int main (int argc, char *argv[])
 	return 0;
 }
 
-
-void process_options (int argc, char *argv[])
-{
-	int error = 0;
-
-	exe_name = argv[0];
-
-	for (;;) {
-		int option_index = 0;
-		static const char *short_options = "jq";
-		static const struct option long_options[] = {
-			{"help", no_argument, 0, 0},
-			{"version", no_argument, 0, 0},
-			{"jffs2", no_argument, 0, 'j'},
-			{"quiet", no_argument, 0, 'q'},
-			{"silent", no_argument, 0, 'q'},
-
-			{0, 0, 0, 0},
-		};
-
-		int c = getopt_long(argc, argv, short_options,
-				long_options, &option_index);
-		if (c == EOF) {
-			break;
-		}
-
-		switch (c) {
-			case 0:
-				switch (option_index) {
-					case 0:
-						display_help();
-						break;
-					case 1:
-						display_version();
-						break;
-				}
-				break;
-			case 'q':
-				quiet = 1;
-				break;
-			case 'j':
-				jffs2 = 1;
-				break;
-			case '?':
-				error = 1;
-				break;
-		}
-	}
-	if (optind == argc) {
-		fprintf(stderr, "%s: no MTD device specified\n", exe_name);
-		error = 1;
-	}
-	if (error) {
-		fprintf(stderr, "Try `%s --help' for more information.\n",
-				exe_name);
-		exit(1);
-	}
-
-	mtd_device = argv[optind];
-}
-
-void show_progress (struct mtd_dev_info *mtd, uint64_t start)
-{
-	printf("\rErasing %d Kibyte @ %llx -- %2llu %% complete.",
-		mtd->eb_size / 1024, (unsigned long long)start,
-		(unsigned long long) start * 100 / mtd->size);
-	fflush(stdout);
-}
-
-void display_help (void)
-{
-	printf("Usage: %s [OPTION] MTD_DEVICE\n"
-			"Erases all of the specified MTD device.\n"
-			"\n"
-			"  -j, --jffs2    format the device for jffs2\n"
-			"  -q, --quiet    don't display progress messages\n"
-			"      --silent   same as --quiet\n"
-			"      --help     display this help and exit\n"
-			"      --version  output version information and exit\n",
-			exe_name);
-	exit(0);
-}
-
-
-void display_version (void)
-{
-	printf(PROGRAM " " VERSION "\n"
-			"\n"
-			"Copyright (C) 2000 Arcom Control Systems Ltd\n"
-			"\n"
-			PROGRAM " comes with NO WARRANTY\n"
-			"to the extent permitted by law.\n"
-			"\n"
-			"You may redistribute copies of " PROGRAM "\n"
-			"under the terms of the GNU General Public Licence.\n"
-			"See the file `COPYING' for more information.\n");
-	exit(0);
-}