Change the semantics of variable hooks. They now return strings
instead of error values.
* util/i386/pc/grub-setup.c: Include grub/env.h.
(setup): Use grub_device_set_root instead of grub_env_set.
* kern/rescue.c (grub_rescue_cmd_root): Use grub_env_set and
grub_env_get instead of grub_device_set_root and
grub_device_get_root, respectively.
* kern/main.c (grub_env_write_root): New function.
(grub_set_root_dev): Register grub_env_write_hook for "root". Use
grub_env_set instead of grub_device_set_root.
* kern/env.c (HASHSZ): Reduced to 13, because GRUB does not need
many variables.
(grub_env_set): Set ENV->VALUE to the result of ENV->WRITE_HOOK
rather than calling ENV->WRITE_HOOK afterwards.
(grub_env_get): Return the result of ENV->READ_HOOK rather than
passing a pointer of a pointer.
(grub_register_variable_hook): Change the types of "read_hook" and
"write_hook" to grub_env_read_hook_t and grub_env_write_hook_t,
respectively.
Allocate the default empty string on the heap, because this string
may be freed later.
* kern/device.c: Include grub/env.h.
(grub_device_set_root): Removed.
(grub_device_get_root): Likewise.
(grub_device_open): Use grub_env_get instead of
grub_device_get_root.
* include/grub/env.h (grub_env_read_hook_t): New type.
(grub_env_write_hook_t): Likewise.
(grub_env_var): Change the types of "read_hook" and "write_hook"
to grub_env_read_hook_t and grub_env_write_hook_t, respectively.
(grub_register_variable_hook): Likewise.
* include/grub/device.h (grub_device_set_root): Removed.
(grub_device_set_root): Likewise.
* fs/fat.c (grub_fat_dir): Make a copy of PATH in DIRNAME, and
make sure that DIRNAME terminates with '/', so that
grub_fat_find_dir will fail if PATH is not a directory.
* commands/ls.c (grub_ls_list_files): Remove the qualifier const
from DIRNAME.
Use the qualifier auto for print_files and print_files_long.
If FS->DIR sets GRUB_ERRNO to GRUB_ERR_BAD_FILE_TYPE, try DIRNAME
as a regular file.
Put a newline only if there is no error.
(grub_cmd_ls): Remove grub_ls_print_files, because this is not
used.
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