From 071ceba1e38f93ba2d937ae7fad037c5a9493655 Mon Sep 17 00:00:00 2001
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Fri, 13 Apr 2012 14:02:47 +0800
Subject: Introduce binfmt support

This will allow to execute any file and detect it's type to handle it.
This will allow to use shell for bootp bootfile or dfu.

You can register multiple hook for the same filetype. They will be execute
in the invert order of register. If a hook does not handle the file you just
return -ERESTARTNOHAND;

This is only available with hush parser.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 common/binfmt.c | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 common/binfmt.c

(limited to 'common/binfmt.c')

diff --git a/common/binfmt.c b/common/binfmt.c
new file mode 100644
index 0000000000..7dcf5d737d
--- /dev/null
+++ b/common/binfmt.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#include <common.h>
+#include <binfmt.h>
+#include <libbb.h>
+#include <malloc.h>
+#include <command.h>
+#include <errno.h>
+
+static LIST_HEAD(binfmt_hooks);
+
+static int binfmt_run(char *file, int argc, char **argv)
+{
+	struct binfmt_hook *b;
+	enum filetype type = file_name_detect_type(file);
+	int ret;
+
+	list_for_each_entry(b, &binfmt_hooks, list) {
+		if (b->type != type)
+			continue;
+
+		ret = b->hook(b, file, argc, argv);
+		if (ret != -ERESTARTNOHAND)
+			return ret;
+	}
+	return -ENOENT;
+}
+
+/*
+ * This converts the original '/executable <args>' into
+ * 'barebox_cmd <args> /executable'
+ */
+static int binfmt_exec_excute(struct binfmt_hook *b, char *file, int argc, char **argv)
+{
+	char **newargv = xzalloc(sizeof(char*) * (argc + 1));
+	int ret, i;
+
+	newargv[0] = b->exec;
+
+	for (i = 1 ; i < argc; i++)
+		newargv[i] = argv[i];
+	newargv[i] = file;
+
+	ret = execute_binfmt(argc + 1, newargv);
+
+	free(newargv);
+
+	return ret;
+}
+
+int execute_binfmt(int argc, char **argv)
+{
+	int ret;
+	char *path;
+
+	if (strchr(argv[0], '/'))
+		return binfmt_run(argv[0], argc, argv);
+
+	path = find_execable(argv[0]);
+	if (path) {
+		ret = binfmt_run(path, argc, argv);
+		free(path);
+		return ret;
+	}
+
+	return execute_command(argc, &argv[0]);
+}
+
+int binfmt_register(struct binfmt_hook *b)
+{
+	if (!b || !b->type)
+		return -EIO;
+
+	if (!b->hook && !b->exec)
+		return -EIO;
+
+	if (b->exec)
+		b->hook = binfmt_exec_excute;
+
+	list_add_tail(&b->list, &binfmt_hooks);
+
+	return 0;
+}
+
+void binfmt_unregister(struct binfmt_hook *b)
+{
+	if (!b)
+		return;
+
+	list_del(&b->list);
+}
-- 
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