FS#11347 by me: *dir LUA functions: luadir module

mkdir and rmdir are now in this module and not in the rockbox API
implements the 'dir' iterator to browse directories

Based on LuaFileSystem : http://www.keplerproject.org/luafilesystem

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26913 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/lua/SOURCES

@@ -39,3 +39,4 @@ strtoul.c
 strtol.c
 strstr.c
 rocklua.c
+luadir.c

apps/plugins/lua/luadir.c

@@ -0,0 +1,138 @@
+/*
+ * Based on LuaFileSystem : http://www.keplerproject.org/luafilesystem
+ *
+ * Copyright © 2003 Kepler Project.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include "plugin.h"
+#include "rocklibc.h"
+
+#include "lauxlib.h"
+#include "luadir.h"
+
+#define DIR_METATABLE "directory metatable"
+typedef struct dir_data {
+    int  closed;
+    DIR *dir;
+} dir_data;
+
+static int make_dir (lua_State *L) {
+    const char *path = luaL_checkstring (L, 1);
+    lua_pushboolean (L, !rb->mkdir(path));
+    return 1;
+}
+
+static int remove_dir (lua_State *L) {
+    const char *path = luaL_checkstring (L, 1);
+    lua_pushboolean (L, !rb->rmdir (path));
+    return 1;
+}
+
+/*
+** Directory iterator
+*/
+static int dir_iter (lua_State *L) {
+    struct dirent *entry;
+    dir_data *d = (dir_data *)luaL_checkudata (L, 1, DIR_METATABLE);
+    luaL_argcheck (L, !d->closed, 1, "closed directory");
+
+    if ((entry = rb->readdir (d->dir)) != NULL) {
+        lua_pushstring (L, entry->d_name);
+        lua_pushboolean (L, entry->attribute & ATTR_DIRECTORY);
+        return 2;
+    } else {
+        /* no more entries => close directory */
+        rb->closedir (d->dir);
+        d->closed = 1;
+        return 0;
+    }
+}
+
+
+/*
+** Closes directory iterators
+*/
+static int dir_close (lua_State *L) {
+    dir_data *d = (dir_data *)lua_touserdata (L, 1);
+
+    if (!d->closed && d->dir) {
+        rb->closedir (d->dir);
+        d->closed = 1;
+    }
+
+    return 0;
+}
+
+
+/*
+** Factory of directory iterators
+*/
+static int dir_iter_factory (lua_State *L) {
+    const char *path = luaL_checkstring (L, 1);
+    dir_data *d;
+    lua_pushcfunction (L, dir_iter);
+    d = (dir_data *) lua_newuserdata (L, sizeof(dir_data));
+    d->closed = 0;
+
+    luaL_getmetatable (L, DIR_METATABLE);
+    lua_setmetatable (L, -2);
+    d->dir = rb->opendir (path);
+    if (d->dir == NULL)
+        luaL_error (L, "cannot open %s: %d", path, errno);
+
+    return 2;
+}
+
+
+/*
+** Creates directory metatable.
+*/
+static int dir_create_meta (lua_State *L) {
+    luaL_newmetatable (L, DIR_METATABLE);
+    /* set its __gc field */
+    lua_pushstring (L, "__index");
+    lua_newtable(L);
+    lua_pushstring (L, "next");
+    lua_pushcfunction (L, dir_iter);
+    lua_settable(L, -3);
+    lua_pushstring (L, "close");
+    lua_pushcfunction (L, dir_close);
+    lua_settable(L, -3);
+    lua_settable (L, -3);
+    lua_pushstring (L, "__gc");
+    lua_pushcfunction (L, dir_close);
+    lua_settable (L, -3);
+    return 1;
+}
+
+static const struct luaL_reg fslib[] = {
+    {"dir", dir_iter_factory},
+    {"mkdir", make_dir},
+    {"rmdir", remove_dir},
+    {NULL, NULL},
+};
+
+int luaopen_luadir (lua_State *L) {
+    dir_create_meta (L);
+    luaL_register (L, LUA_DIRLIBNAME, fslib);
+    return 1;
+}

apps/plugins/lua/luadir.h

@@ -0,0 +1,9 @@
+/*
+** LuaFileSystem
+** Copyright Kepler Project 2003 (http://www.keplerproject.org/luafilesystem)
+**
+** $Id: lfs.h,v 1.5 2008/02/19 20:08:23 mascarenhas Exp $
+*/
+
+int luaopen_luadir (lua_State *L);
+#define LUA_DIRLIBNAME "luadir"

apps/plugins/lua/rocklib_aux.pl

@@ -54,6 +54,8 @@ my @forbidden_functions = ('^open$',
                            '^close$',
                            '^read$',
                            '^write$',
+                           '^mkdir$',
+                           '^rmdir$',
                            '^lseek$',
                            '^ftruncate$',
                            '^filesize$',

apps/plugins/lua/rocklua.c

@@ -26,6 +26,7 @@
 #include "lualib.h"
 #include "rocklib.h"
 #include "rockmalloc.h"
+#include "luadir.h"
 
 PLUGIN_HEADER
 
@@ -39,6 +40,7 @@ static const luaL_Reg lualibs[] = {
   {LUA_IOLIBNAME,   luaopen_io},
   {LUA_LOADLIBNAME, luaopen_package},
   {LUA_MATHLIBNAME, luaopen_math},
+  {LUA_DIRLIBNAME,  luaopen_luadir},
   {NULL, NULL}
 };