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-rw-r--r--flash_unlock.c73
1 files changed, 36 insertions, 37 deletions
diff --git a/flash_unlock.c b/flash_unlock.c
index 759a5bc..3bb3381 100644
--- a/flash_unlock.c
+++ b/flash_unlock.c
@@ -22,48 +22,51 @@
#include <sys/mount.h>
#include <string.h>
+#include "common.h"
#include <mtd/mtd-user.h>
+static void usage(int status)
+{
+ fprintf(status ? stderr : stdout,
+ "Usage: %s <mtd device> [offset] [block count]\n\n"
+ "If offset is not specified, it defaults to 0.\n"
+ "If block count is not specified, it defaults to all blocks.\n",
+ PROGRAM_NAME);
+ exit(status);
+}
+
int main(int argc, char *argv[])
{
int fd, request;
struct mtd_info_user mtdInfo;
struct erase_info_user mtdLockInfo;
int count;
+ const char *dev;
+
+ /* Parse command line options */
+ if (argc < 2 || argc > 4)
+ usage(1);
+ if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
+ usage(0);
- /*
- * Parse command line options
- */
- if (argc < 2) {
- fprintf(stderr, "USAGE: %s <mtd device> <offset> <block count>\n", PROGRAM_NAME);
- exit(1);
- } else if (strncmp(argv[1], "/dev/mtd", 8) != 0) {
- fprintf(stderr, "'%s' is not a MTD device. Must specify mtd device: /dev/mtd?\n", argv[1]);
- exit(1);
- }
+ dev = argv[1];
- fd = open(argv[1], O_RDWR);
- if (fd < 0) {
- fprintf(stderr, "Could not open mtd device: %s\n", argv[1]);
- exit(1);
- }
+ /* Get the device info to compare to command line sizes */
+ fd = open(dev, O_RDWR);
+ if (fd < 0)
+ sys_errmsg_die("could not open: %s", dev);
- if (ioctl(fd, MEMGETINFO, &mtdInfo)) {
- fprintf(stderr, "Could not get MTD device info from %s\n", argv[1]);
- close(fd);
- exit(1);
- }
+ if (ioctl(fd, MEMGETINFO, &mtdInfo))
+ sys_errmsg_die("could not get mtd info: %s", dev);
+ /* Make sure user options are valid */
if (argc > 2)
mtdLockInfo.start = strtol(argv[2], NULL, 0);
else
mtdLockInfo.start = 0;
- if (mtdLockInfo.start > mtdInfo.size) {
- fprintf(stderr, "%#x is beyond device size %#x\n",
+ if (mtdLockInfo.start > mtdInfo.size)
+ errmsg_die("%#x is beyond device size %#x",
mtdLockInfo.start, mtdInfo.size);
- close(fd);
- exit(1);
- }
if (argc > 3) {
count = strtol(argv[3], NULL, 0);
@@ -71,21 +74,17 @@ int main(int argc, char *argv[])
mtdLockInfo.length = mtdInfo.size - mtdInfo.erasesize;
else
mtdLockInfo.length = mtdInfo.erasesize * count;
- } else {
+ } else
mtdLockInfo.length = mtdInfo.size - mtdInfo.erasesize;
- }
- if (mtdLockInfo.start + mtdLockInfo.length > mtdInfo.size) {
- fprintf(stderr, "%s range is more than device supports\n", FLASH_MSG);
- exit(1);
- }
+ if (mtdLockInfo.start + mtdLockInfo.length > mtdInfo.size)
+ errmsg_die("range is more than device supports: %#x + %#x > %#x",
+ mtdLockInfo.start, mtdLockInfo.length, mtdInfo.size);
+ /* Finally do the operation */
request = FLASH_UNLOCK ? MEMUNLOCK : MEMLOCK;
- if (ioctl(fd, request, &mtdLockInfo)) {
- fprintf(stderr, "Could not %s MTD device: %s\n",
- FLASH_MSG, argv[1]);
- close(fd);
- exit(1);
- }
+ if (ioctl(fd, request, &mtdLockInfo))
+ sys_errmsg_die("could not %s device: %s\n",
+ FLASH_MSG, dev);
return 0;
}