1 files changed, 121 insertions, 0 deletions
diff --git a/misc/e2label.c b/misc/e2label.c
new file mode 100644
index 0000000..910ccc7
--- /dev/null
+++ b/misc/e2label.c
@@ -0,0 +1,121 @@
+/*
+ * e2label.c		- Print or change the volume label on an ext2 fs
+ *
+ * Written by Andries Brouwer (aeb@cwi.nl), 970714
+ *
+ * Copyright 1997, 1998 by Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <termios.h>
+#include <time.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern char *optarg;
+extern int optind;
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include "support/nls-enable.h"
+
+#define EXT2_SUPER_MAGIC 0xEF53
+
+#define VOLNAMSZ 16
+
+struct ext2_super_block {
+	char  s_dummy0[56];
+	unsigned char  s_magic[2];
+	char  s_dummy1[62];
+	char  s_volume_name[VOLNAMSZ];
+	char  s_last_mounted[64];
+	char  s_dummy2[824];
+} sb;
+
+static int open_e2fs (char *dev, int mode)
+{
+	int fd;
+
+	fd = open(dev, mode);
+	if (fd < 0) {
+	     perror(dev);
+	     fprintf (stderr, _("e2label: cannot open %s\n"), dev);
+	     exit(1);
+	}
+	if (lseek(fd, 1024, SEEK_SET) != 1024) {
+	     perror(dev);
+	     fprintf (stderr, _("e2label: cannot seek to superblock\n"));
+	     exit(1);
+	}
+	if (read(fd, (char *) &sb, sizeof(sb)) != sizeof(sb)) {
+	     perror(dev);
+	     fprintf (stderr, _("e2label: error reading superblock\n"));
+	     exit(1);
+	}
+	if (sb.s_magic[0] + 256*sb.s_magic[1] != EXT2_SUPER_MAGIC) {
+	     fprintf (stderr, _("e2label: not an ext2 filesystem\n"));
+	     exit(1);
+	}
+
+	return fd;
+}
+
+static void print_label (char *dev)
+{
+	char label[VOLNAMSZ+1];
+
+	open_e2fs (dev, O_RDONLY);
+	snprintf(label, sizeof(label), "%.*s", EXT2_LEN_STR(sb.s_volume_name));
+	label[VOLNAMSZ] = 0;
+	printf("%s\n", label);
+}
+
+static void change_label (char *dev, char *label)
+{
+	int fd;
+
+	fd = open_e2fs(dev, O_RDWR);
+	memset(sb.s_volume_name, 0, VOLNAMSZ);
+	strncpy(sb.s_volume_name, label, VOLNAMSZ);
+	if (strlen(label) > VOLNAMSZ)
+		fprintf(stderr, _("Warning: label too long, truncating.\n"));
+	if (lseek(fd, 1024, SEEK_SET) != 1024) {
+	     perror(dev);
+	     fprintf (stderr, _("e2label: cannot seek to superblock again\n"));
+	     exit(1);
+	}
+	if (write(fd, (char *) &sb, sizeof(sb)) != sizeof(sb)) {
+	     perror(dev);
+	     fprintf (stderr, _("e2label: error writing superblock\n"));
+	     exit(1);
+	}
+}
+
+int main (int argc, char ** argv)
+{
+	if (argc == 2)
+	     print_label(argv[1]);
+	else if (argc == 3)
+	     change_label(argv[1], argv[2]);
+	else {
+	     fprintf(stderr, _("Usage: e2label device [newlabel]\n"));
+	     exit(1);
+	}
+	return 0;
+}