X-Git-Url: https://git.wh0rd.org/?p=home.git;a=blobdiff_plain;f=ddnuke.c;h=1712d16b6f0e0c4ab49a3cf59aef9d9d0f12d1b2;hp=03ac78958fdac7daa83bd1645c172b9dc2ffbc53;hb=64b0a6dd26e21c1c3eac846738470edbe0350251;hpb=d8ceb2d61d353617ea72a576566bb969b60bf0fb

diff --git a/ddnuke.c b/ddnuke.c
index 03ac789..1712d16 100644
--- a/ddnuke.c
+++ b/ddnuke.c
@@ -11,6 +11,7 @@
 #define _LARGEFILE64_SOURCE
 #define _GNU_SOURCE
 
+#include <err.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
@@ -26,12 +27,6 @@
 #include <sys/stat.h>
 #include <linux/fs.h>
 
-#define errp(msg, args...) \
-	do { \
-		printf("%s: " msg ": %m\n", program_invocation_short_name, ## args); \
-		exit(1); \
-	} while (0)
-
 static unsigned long long mbps(struct timespec *stime, struct timespec *etime, off_t len)
 {
 	uint64_t dtime;
@@ -46,7 +41,7 @@ static off_t get_blk_size(int fd)
 {
 	uint64_t size;
 	if (ioctl(fd, BLKGETSIZE64, &size))
-		errp("ioctl(BLKGETSIZE64) failed");
+		err(1, "ioctl(BLKGETSIZE64) failed");
 	return size;
 }
 
@@ -55,7 +50,7 @@ static off_t get_size(int fd)
 	struct stat st;
 
 	if (fstat(fd, &st))
-		errp("could not stat %i", fd);
+		err(1, "could not stat %i", fd);
 
 	if (S_ISREG(st.st_mode))
 		return st.st_size;
@@ -63,7 +58,7 @@ static off_t get_size(int fd)
 		return get_blk_size(fd);
 
 	errno = EINVAL;
-	errp("unknown type of file");
+	err(1, "unknown type of file");
 }
 
 static void nuke(int fd, off_t offset, off_t max_size, unsigned char pattern)
@@ -73,6 +68,9 @@ static void nuke(int fd, off_t offset, off_t max_size, unsigned char pattern)
 	if (pattern)
 		printf("Writing 0x%X to the output\n", pattern);
 
+	if (lseek(fd, offset, SEEK_SET) != offset)
+		err(1, "lseek(%"PRIu64"u) failed", offset);
+
 	unsigned long long speed = 0;
 	struct timespec stime, etime, itime;
 	clock_gettime(CLOCK_MONOTONIC, &stime);
@@ -86,15 +84,16 @@ static void nuke(int fd, off_t offset, off_t max_size, unsigned char pattern)
 		ret = write(fd, mem, sizeof(mem));
 		pos += ret;
 		if (ret != sizeof(mem)) {
-			printf("\nread() returned %zi (wanted %zu)\n%'llu MB/s over entire run\n",
-				ret, sizeof(mem), mbps(&itime, &etime, pos));
+			if (pos != max_size)
+				printf("\nread() returned %zi (wanted %zu)\n%'llu MB/s over entire run\n",
+					ret, sizeof(mem), mbps(&itime, &etime, pos));
 			return;
 		}
 
-		printf("%'llu bytes %u%% (%'llu MB/s)%20s\r", (unsigned long long)pos,
-			(unsigned)((pos * 100) / max_size), speed, "");
+		printf("\r\e[2K%'llu bytes %u%% (%'llu MB/s)", (unsigned long long)pos,
+			(unsigned)((pos * 100) / max_size), speed);
 
-		if ((++fsync_pos % 16) == 0) {
+		if ((++fsync_pos % 32) == 0) {
 			speed = mbps(&stime, &etime, pos - last_pos);
 			last_pos = pos;
 			fflush(stdout);
@@ -111,9 +110,9 @@ static void usage(int status)
 		status ? stderr : stdout,
 		"Usage: ddnuke [options] <dev>\n"
 		"\n"
-		"Options:"
+		"Options:\n"
 		" -o <offset>   Position to start writing\n"
-		" -r            Write random garbage to the device\n"
+		" -r            Write three times: 0x00, then 0xaa, then 0x55\n"
 	);
 	exit(status);
 }
@@ -135,8 +134,12 @@ int main(int argc, char *argv[])
 		case 'r':
 			random = true;
 			break;
-		case 'h': usage(EX_OK);
-		default:  usage(EX_USAGE);
+		case 'h':
+			usage(EX_OK);
+			break;
+		default:
+			usage(EX_USAGE);
+			break;
 		}
 	}
 	if (argc != optind + 1)
@@ -145,13 +148,10 @@ int main(int argc, char *argv[])
 
 	int fd = open(file, O_WRONLY|O_CLOEXEC);
 	if (fd == -1)
-		errp("open(%s) failed", file);
+		err(1, "open(%s) failed", file);
 
 	off_t max_size = get_size(fd);
 
-	if (lseek(fd, offset, SEEK_SET) != offset)
-		errp("lseek(%"PRIu64"u) failed", offset);
-
 	nuke(fd, offset, max_size, 0x00);
 	if (random) {
 		nuke(fd, offset, max_size, 0xaa);