[PATCH 2/4] Accept environment variables on the command line for Xen.

[Colin Watson <cjwatson@ubuntu.com>]

* grub-core/kern/xen/init.c (fetch_command_line_word): New function.
(parse_command_line): Likewise.
(grub_machine_init): Call parse_command_line.
---
 ChangeLog                 |  8 ++++++++
 grub-core/kern/xen/init.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 766fe4b..fc86601 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2013-12-12  Colin Watson  <cjwatson@ubuntu.com>
 
+	Accept environment variables on the command line for Xen.
+
+	* grub-core/kern/xen/init.c (fetch_command_line_word): New function.
+	(parse_command_line): Likewise.
+	(grub_machine_init): Call parse_command_line.
+
+2013-12-12  Colin Watson  <cjwatson@ubuntu.com>
+
 	Add an option to exclude devices from search results.
 
 	* grub-core/commands/search.c (struct search_ctx): Add excludes and
diff --git a/grub-core/kern/xen/init.c b/grub-core/kern/xen/init.c
index 1d8eaec..eb9b8b3 100644
--- a/grub-core/kern/xen/init.c
+++ b/grub-core/kern/xen/init.c
@@ -525,6 +525,48 @@ map_all_pages (void)
   grub_mm_init_region ((void *) heap_start, heap_end - heap_start);
 }
 
+static char *
+fetch_command_line_word (char *pos, char **word)
+{
+  while (grub_isspace (*pos))
+    pos++;
+
+  if (!*pos)
+    return NULL;
+
+  *word = pos;
+  while (*pos && !grub_isspace (*pos))
+    pos++;
+  if (*pos)
+    *pos++ = '\0';
+  return pos;
+}
+
+static void
+parse_command_line (void)
+{
+  char *cmd_line;
+  char *pos, *word;
+
+  cmd_line = grub_malloc (MAX_GUEST_CMDLINE + 1);
+  grub_memcpy (cmd_line, grub_xen_start_page_addr->cmd_line,
+	       MAX_GUEST_CMDLINE);
+  cmd_line[MAX_GUEST_CMDLINE] = '\0';
+  pos = cmd_line;
+  while ((pos = fetch_command_line_word (pos, &word)) != NULL)
+    {
+      char *equals;
+
+      equals = grub_strchr (word, '=');
+      if (!equals)
+	continue;
+
+      *equals = '\0';
+      grub_env_set (word, equals + 1);
+    }
+  grub_free (cmd_line);
+}
+
 extern char _end[];
 
 void
@@ -547,6 +589,8 @@ grub_machine_init (void)
   grub_xendisk_init ();
 
   grub_boot_init ();
+
+  parse_command_line ();
 }
 
 void
-- 
1.8.4.4