Re: iterate return values

[Hollis Blanchard <hollis@penguinppc.org>]

This one took waaay too long to track down. :( It is very difficult to
debug when the problem is that grub_errno has a stale value.

This fixes my partition map problems, and has been tested both with
Apple and DOS partition maps.

-Hollis

Index: ChangeLog
===================================================================
RCS file: /cvsroot/grub/grub2/ChangeLog,v
retrieving revision 1.90
diff -u -p -r1.90 ChangeLog
--- ChangeLog	1 Feb 2005 21:53:34 -0000	1.90
+++ ChangeLog	4 Feb 2005 06:34:08 -0000
@@ -1,3 +1,13 @@
+2005-02-03  Hollis Blanchard  <hollis@penguinppc.org>
+
+	* kern/partition.c (grub_partition_probe): Clear `grub_errno' and
+	return 0 if `grub_errno' is GRUB_ERR_BAD_PART_TABLE. 
+	(part_map_iterate): Clear `grub_errno' and return 0 if
+	`partmap->iterate' returns GRUB_ERR_BAD_PART_TABLE. 
+	* partmap/amiga.c (amiga_partition_map_iterate): Return
+	GRUB_ERR_BAD_PART_TABLE if no partition map magic is found.
+	* partmap/apple.c (apple_partition_map_iterate): Likewise.
+
 2005-02-01  Guillem Jover  <guillem@hadrons.org>
 
 	* loader/i386/pc/multiboot_normal.c (GRUB_MOD_INIT): Fix module
Index: kern/partition.c
===================================================================
RCS file: /cvsroot/grub/grub2/kern/partition.c,v
retrieving revision 1.1
diff -u -p -r1.1 partition.c
--- kern/partition.c	4 Dec 2004 18:45:45 -0000	1.1
+++ kern/partition.c	4 Feb 2005 06:34:11 -0000
@@ -56,20 +56,28 @@ grub_partition_t
 grub_partition_probe (struct grub_disk *disk, const char *str)
 {
   grub_partition_t part;
-  
+
   auto int part_map_probe (const grub_partition_map_t partmap);
-  
+
   int part_map_probe (const grub_partition_map_t partmap)
     {
       part = partmap->probe (disk, str);
       if (part)
 	return 1;
-      return 0;
+
+      if (grub_errno == GRUB_ERR_BAD_PART_TABLE)
+	{
+	  /* Continue to next partition map type.  */
+	  grub_errno = GRUB_ERR_NONE;
+	  return 0;
+	}
+
+      return 1;
     }
 
   /* Use the first partition map type found.  */
   grub_partition_map_iterate (part_map_probe);
-  
+
   return part;
 }
 
@@ -78,12 +86,21 @@ grub_partition_iterate (struct grub_disk
 			int (*hook) (const grub_partition_t partition))
 {
   auto int part_map_iterate (const grub_partition_map_t partmap);
-  
+
   int part_map_iterate (const grub_partition_map_t partmap)
     {
-      return partmap->iterate (disk, hook);
+      grub_err_t err = partmap->iterate (disk, hook);
+
+      if (err == GRUB_ERR_BAD_PART_TABLE)
+	{
+	  /* Continue to next partition map type.  */
+	  grub_errno = GRUB_ERR_NONE;
+	  return 0;
+	}
+
+      return 1;
     }
-  
+
   grub_partition_map_iterate (part_map_iterate);
   return grub_errno;
 }
Index: partmap/amiga.c
===================================================================
RCS file: /cvsroot/grub/grub2/partmap/amiga.c,v
retrieving revision 1.1
diff -u -p -r1.1 amiga.c
--- partmap/amiga.c	4 Dec 2004 18:45:45 -0000	1.1
+++ partmap/amiga.c	4 Feb 2005 06:34:11 -0000
@@ -102,6 +102,10 @@ amiga_partition_map_iterate (grub_disk_t
 	  break;
 	}
     }
+
+  if (next == -1)
+    return grub_error (GRUB_ERR_BAD_PART_TABLE,
+		       "Amiga partition map not found.");
   
   /* The end of the partition list is marked using "-1".  */
   while (next != -1)
Index: partmap/apple.c
===================================================================
RCS file: /cvsroot/grub/grub2/partmap/apple.c,v
retrieving revision 1.1
diff -u -p -r1.1 apple.c
--- partmap/apple.c	4 Dec 2004 18:45:45 -0000	1.1
+++ partmap/apple.c	4 Feb 2005 06:34:11 -0000
@@ -108,7 +108,7 @@ apple_partition_map_iterate (grub_disk_t
   raw.partition = 0;
 
   part.partmap = &grub_apple_partition_map;
-  
+
   for (;;)
     {
       if (grub_disk_read (&raw, pos / GRUB_DISK_SECTOR_SIZE,
@@ -134,6 +134,10 @@ apple_partition_map_iterate (grub_disk_t
       partno++;
     }
 
+  if ((pos / GRUB_DISK_SECTOR_SIZE) == 0)
+    return grub_error (GRUB_ERR_BAD_PART_TABLE,
+		       "Apple partition map not found.");
+
   return 0;
 }
 
@@ -178,7 +182,6 @@ apple_partition_map_probe (grub_disk_t d
  fail:
   grub_free (p);
   return 0;
-
 }