[syslinux:master] lua: initramfs: enable adding nonempty files

[syslinux-bot for Ferenc Wágner]

Commit-ID:  d643cc061c7b2af4e49363f83abbb12eb162fadf
Gitweb:     http://www.syslinux.org/commit/d643cc061c7b2af4e49363f83abbb12eb162fadf
Author:     Ferenc Wágner <wferi at niif.hu>
AuthorDate: Mon, 13 Oct 2014 00:44:41 +0200
Committer:  Ferenc Wágner <wferi at niif.hu>
CommitDate: Mon, 13 Oct 2014 10:45:19 +0200

lua: initramfs: enable adding nonempty files

Signed-off-by: Ferenc Wágner <wferi at niif.hu>

---
 com32/lua/src/syslinux.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/com32/lua/src/syslinux.c b/com32/lua/src/syslinux.c
index fa23647..18934e1 100644
--- a/com32/lua/src/syslinux.c
+++ b/com32/lua/src/syslinux.c
@@ -302,11 +302,18 @@ static int sl_initramfs_load_archive(lua_State * L)
 static int sl_initramfs_add_file(lua_State * L)
 {
     const char *filename = luaL_checkstring(L, 2);
-    void *file_data = NULL;
-    size_t file_len = 0;
-
+    size_t file_len;
+    const char *file_data = luaL_optlstring (L, 3, NULL, &file_len);
+    void *data = NULL;
+
+    if (file_len) {
+        data = malloc (file_len);
+        if (!data) return luaL_error (L, "Out of memory");
+        memcpy (data, file_data, file_len);
+    }
     if (initramfs_add_file(luaL_checkudata(L, 1, SYSLINUX_INITRAMFS),
-                           file_data, file_len, file_len, filename, 0, 0755))
+                           data, file_len, file_len, filename,
+                           luaL_optint (L, 4, 0), luaL_optint (L, 5, 0755)))
         return luaL_error (L, "Adding file %s to initramfs failed", filename);
     return 0;
 }