LFS compatibility.

[dump.git] / compat / lib / bylabel.c

diff --git a/compat/lib/bylabel.c b/compat/lib/bylabel.c
index 9cdd0e5da502524644ee1fe4fba7a9bb50a4a364..31bdd0d601746b66a31b477ff73461a040b18ed6 100644 (file)
--- a/compat/lib/bylabel.c
+++ b/compat/lib/bylabel.c
@@ -11,19 +11,29 @@
  * - Ported to dump/restore
  */
 
+#include <config.h>
 #include <stdio.h>
 #include <sys/param.h>
 #include <string.h>
 #include <ctype.h>
 #include <fcntl.h>
 #include <unistd.h>
-#include <linux/ext2_fs.h>
-#include <ext2fs/ext2fs.h>
+#include <malloc.h>
 #include "bylabel.h"
 
 #define PROC_PARTITIONS "/proc/partitions"
 #define DEVLABELDIR    "/dev"
 
+#define EXT2_SUPER_MAGIC 0xEF53
+struct ext2_super_block {
+       unsigned char   s_dummy1[56];
+       unsigned char   s_magic[2];
+       unsigned char   s_dummy2[46];
+       unsigned char   s_uuid[16];
+       unsigned char   s_volume_name[16];
+};
+#define ext2magic(s)   ((unsigned int) s.s_magic[0] + (((unsigned int) s.s_magic[1]) << 8))
+
 void msg __P((const char *fmt, ...));
 
 static struct uuidCache_s {
@@ -48,7 +58,7 @@ get_label_uuid(const char *device, char **label, char *uuid) {
 
        if (lseek(fd, 1024, SEEK_SET) != 1024
            || read(fd, (char *) &e2sb, sizeof(e2sb)) != sizeof(e2sb)
-           || (e2sb.s_magic != EXT2_SUPER_MAGIC)) {
+           || (ext2magic(e2sb) != EXT2_SUPER_MAGIC)) {
                close(fd);
                return 1;
        }
@@ -67,10 +77,10 @@ uuidcache_addentry(char *device, char *label, char *uuid) {
        struct uuidCache_s *last;
 
        if (!uuidCache) {
-               last = uuidCache = malloc(sizeof(*uuidCache));
+               last = uuidCache = (struct uuidCache_s *)malloc(sizeof(*uuidCache));
        } else {
                for (last = uuidCache; last->next; last = last->next) ;
-               last->next = malloc(sizeof(*uuidCache));
+               last->next = (struct uuidCache_s *)malloc(sizeof(*uuidCache));
                last = last->next;
        }
        last->next = NULL;
@@ -220,3 +230,18 @@ get_device_name(const char * item) {
 
        return rc;
 }
+
+const char *
+get_device_label(const char * spec) {
+       struct uuidCache_s *uc;
+
+       uuidcache_init();
+       uc = uuidCache;
+
+       while(uc) {
+               if (!strcmp(spec, uc->device))
+                       return uc->label[0] == '\0' ? NULL : strdup(uc->label);
+               uc = uc->next;
+       }
+       return NULL;
+}