2009-03-29 Yoshinori K. Okuji <okuji@enbug.org>

Make the format of Environment Block plain text. The boot loader
    part is not tested well yet.
    
    * util/grub-editenv.c (DEFAULT_ENVBLK_SIZE): New macro.
    (buffer): Removed.
    (envblk): Likewise.
    (usage): Remove "info" and "clear". Add "unset". Update the
    description of "set", as this does not delete variables any
    longer.
    (create_envblk_file): Complete rewrite.
    (open_envblk_file): Likewise.
    (cmd_info): Removed.
    (cmd_list): Likewise.
    (cmd_set): Likewise.
    (cmd_clear): Likewise.
    (list_variables): New function.
    (write_envblk): Likewise.
    (set_variables): Likewise.
    (unset_variables): Likewise.
    (main): Complete rewrite.

    * commands/loadenv.c (buffer): Removed.
    (envblk): Likewise.
    (open_envblk_file): New function.
    (read_envblk_file): Complete rewrite.
    (grub_cmd_load_env): Likewise.
    (grub_cmd_list_env): Likewise.
    (struct blocklist): New struct.
    (free_blocklists): New function.
    (check_blocklists): Likewise.
    (write_blocklists): Likewise.
    (grub_cmd_save_env): Complete rewrite.

    * include/grub/lib/envblk.h (GRUB_ENVBLK_SIGNATURE): Replaced with
    a plain text signature.
    (GRUB_ENVBLK_MAXLEN): Removed.
    (struct grub_envblk): Complete rewrite.
    (grub_envblk_find): Removed.
    (grub_envblk_insert): Likewise.
    (grub_envblk_open): New prototype.
    (grub_envblk_set): Likewise.
    (grub_envblk_delete): Put const to VALUE.
    (grub_envblk_iterate): Put const to NAME and VALUE.
    (grub_envblk_close): New prototype.
    (grub_envblk_buffer): New inline function.
    (grub_envblk_size): Likewise.

    * lib/envblk.c: Include grub/mm.h.
    (grub_env_find): Removed.
    (grub_envblk_open): New function.
    (grub_envblk_close): Likewise.
    (escaped_value_len): Likewise.
    (find_next_line): Likewise.
    (grub_envblk_insert): Removed.
    (grub_envblk_set): New function.
    (grub_envblk_delete): Complete rewrite.
    (grub_envblk_iterate): Likewise.

config.h.in

@@ -4,6 +4,9 @@
    prefixed with an asterisk */
 #undef ABSOLUTE_WITHOUT_ASTERISK
 
+/* Define if building universal (internal helper macro) */
+#undef AC_APPLE_UNIVERSAL_BUILD
+
 /* Define it to \"addr32\" or \"addr32;\" to make GAS happy */
 #undef ADDR32
 
@@ -112,17 +115,52 @@
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
-/* Define to 1 if your processor stores words with the most significant byte
-   first (like Motorola and SPARC, unlike Intel and VAX). */
-#undef WORDS_BIGENDIAN
-
-/* Number of bits in a file offset, on hosts where this is settable. */
-#undef _FILE_OFFSET_BITS
-
+/* Enable extensions on AIX 3, Interix.  */
+#ifndef _ALL_SOURCE
+# undef _ALL_SOURCE
+#endif
 /* Enable GNU extensions on systems that have them.  */
 #ifndef _GNU_SOURCE
 # undef _GNU_SOURCE
 #endif
+/* Enable threading extensions on Solaris.  */
+#ifndef _POSIX_PTHREAD_SEMANTICS
+# undef _POSIX_PTHREAD_SEMANTICS
+#endif
+/* Enable extensions on HP NonStop.  */
+#ifndef _TANDEM_SOURCE
+# undef _TANDEM_SOURCE
+#endif
+/* Enable general extensions on Solaris.  */
+#ifndef __EXTENSIONS__
+# undef __EXTENSIONS__
+#endif
+
+
+/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
+   significant byte first (like Motorola and SPARC, unlike Intel). */
+#if defined AC_APPLE_UNIVERSAL_BUILD
+# if defined __BIG_ENDIAN__
+#  define WORDS_BIGENDIAN 1
+# endif
+#else
+# ifndef WORDS_BIGENDIAN
+#  undef WORDS_BIGENDIAN
+# endif
+#endif
+
+/* Number of bits in a file offset, on hosts where this is settable. */
+#undef _FILE_OFFSET_BITS
 
 /* Define for large files, on AIX-style hosts. */
 #undef _LARGE_FILES
+
+/* Define to 1 if on MINIX. */
+#undef _MINIX
+
+/* Define to 2 if the system does not provide POSIX.1 features except with
+   this defined. */
+#undef _POSIX_1_SOURCE
+
+/* Define to 1 if you need to in order for `stat' and other things to work. */
+#undef _POSIX_SOURCE