A modern Music Player Daemon based on Rockbox open source high quality audio player
tsiry-sandratraina.com
libadwaita
audio
rust
zig
deno
mpris
rockbox
mpd
1/*
2** $Id: loadlib.c,v 1.52.1.4 2009/09/09 13:17:16 roberto Exp $
3** Dynamic library loader for Lua
4** See Copyright Notice in lua.h
5**
6** This module contains an implementation of loadlib for Unix systems
7** that have dlfcn, an implementation for Darwin (Mac OS X), an
8** implementation for Windows, and a stub for other systems.
9*/
10
11
12#include <stdlib.h>
13#include <string.h>
14
15
16#define loadlib_c
17#define LUA_LIB
18
19#include "lua.h"
20
21#include "lauxlib.h"
22#include "lualib.h"
23#include "rocklib.h"
24#include "rocklibc.h"
25
26#define setprogdir(L) ((void)0) /* ROCKLUA ADDED */
27
28
29/*
30** {======================================================
31** 'require' function
32** =======================================================
33*/
34
35
36static int readable (const char *filename) {
37 int f = rb->open(filename, O_RDONLY); /* try to open file */
38 if (f < 0) return 0; /* open failed */
39 rb->close(f);
40 return 1;
41}
42
43
44static const char *pushnexttemplate (lua_State *L, const char *path) {
45 const char *l;
46 while (*path == *LUA_PATHSEP) path++; /* skip separators */
47 if (*path == '\0') return NULL; /* no more templates */
48 l = strchr(path, *LUA_PATHSEP); /* find next separator */
49 if (l == NULL) l = path + strlen(path);
50 lua_pushlstring(L, path, l - path); /* template */
51 return l;
52}
53
54
55static const char *findfile (lua_State *L, const char *name,
56 const char *pname) {
57 get_current_path(L, 2); /* ROCKLUA ADDED */
58 const char *current_path = lua_tostring(L, -1);
59 const char *path;
60
61 name = luaL_gsub(L, name, ".", LUA_DIRSEP);
62 lua_getfield(L, LUA_ENVIRONINDEX, pname);
63 path = lua_tostring(L, -1);
64 if (path == NULL)
65 luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
66 lua_pushliteral(L, ""); /* error accumulator */
67 while ((path = pushnexttemplate(L, path)) != NULL) {
68 const char *filename;
69 filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
70 if(current_path != NULL) filename = luaL_gsub(L, filename, "$", current_path);
71 lua_remove(L, -2); /* remove path template */
72 if (readable(filename)) /* does file exist and is readable? */
73 return filename; /* return that file name */
74 lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
75 lua_remove(L, -2); /* remove file name */
76 lua_concat(L, 2); /* add entry to possible error message */
77 }
78 return NULL; /* not found */
79}
80
81
82static void loaderror (lua_State *L, const char *filename) {
83 luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
84 lua_tostring(L, 1), filename, lua_tostring(L, -1));
85}
86
87
88static int loader_Lua (lua_State *L) {
89 const char *filename;
90 const char *name = luaL_checkstring(L, 1);
91 filename = findfile(L, name, "path");
92 if (filename == NULL) return 1; /* library not found in this path */
93 if (luaL_loadfile(L, filename) != 0)
94 loaderror(L, filename);
95 return 1; /* library loaded successfully */
96}
97
98
99static int loader_preload (lua_State *L) {
100 const char *name = luaL_checkstring(L, 1);
101 lua_getfield(L, LUA_ENVIRONINDEX, "preload");
102 if (!lua_istable(L, -1))
103 luaL_error(L, LUA_QL("package.preload") " must be a table");
104 lua_getfield(L, -1, name);
105 if (lua_isnil(L, -1)) /* not found? */
106 lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
107 return 1;
108}
109
110
111static const int sentinel_ = 0;
112#define sentinel ((void *)&sentinel_)
113
114
115static int ll_require (lua_State *L) {
116 const char *name = luaL_checkstring(L, 1);
117 int i;
118 lua_settop(L, 1); /* _LOADED table will be at index 2 */
119 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
120 lua_getfield(L, 2, name);
121 if (lua_toboolean(L, -1)) { /* is it there? */
122 if (lua_touserdata(L, -1) == sentinel) /* check loops */
123 luaL_error(L, "loop or previous error loading module " LUA_QS, name);
124 return 1; /* package is already loaded */
125 }
126 /* else must load it; iterate over available loaders */
127 lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
128 if (!lua_istable(L, -1))
129 luaL_error(L, LUA_QL("package.loaders") " must be a table");
130 lua_pushliteral(L, ""); /* error message accumulator */
131 for (i=1; ; i++) {
132 lua_rawgeti(L, -2, i); /* get a loader */
133 if (lua_isnil(L, -1)) {
134 lua_setfield(L, 2, name); /* _LOADED[name] = nil */
135 luaL_error(L, "module " LUA_QS " not found:%s",
136 name, lua_tostring(L, -2));
137 }
138 lua_pushstring(L, name);
139 lua_call(L, 1, 1); /* call it */
140 if (lua_isfunction(L, -1)) /* did it find module? */
141 break; /* module loaded successfully */
142 else if (lua_isstring(L, -1)) /* loader returned error message? */
143 lua_concat(L, 2); /* accumulate it */
144 else
145 lua_pop(L, 1);
146 }
147 lua_pushlightuserdata(L, sentinel);
148 lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */
149 lua_pushstring(L, name); /* pass name as argument to module */
150 lua_call(L, 1, 1); /* run loaded module */
151 if (!lua_isnil(L, -1)) /* non-nil return? */
152 lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
153 lua_getfield(L, 2, name);
154 if (lua_touserdata(L, -1) == sentinel) { /* module did not set a value? */
155 lua_pushboolean(L, 1); /* use true as result */
156 lua_pushvalue(L, -1); /* extra copy to be returned */
157 lua_setfield(L, 2, name); /* _LOADED[name] = true */
158 }
159 return 1;
160}
161
162/* }====================================================== */
163
164
165
166/*
167** {======================================================
168** 'module' function
169** =======================================================
170*/
171
172
173static void setfenv (lua_State *L) {
174 lua_Debug ar;
175 if (lua_getstack(L, 1, &ar) == 0 ||
176 lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
177 lua_iscfunction(L, -1))
178 luaL_error(L, LUA_QL("module") " not called from a Lua function");
179 lua_pushvalue(L, -2);
180 lua_setfenv(L, -2);
181 lua_pop(L, 1);
182}
183
184
185static void dooptions (lua_State *L, int n) {
186 int i;
187 for (i = 2; i <= n; i++) {
188 lua_pushvalue(L, i); /* get option (a function) */
189 lua_pushvalue(L, -2); /* module */
190 lua_call(L, 1, 0);
191 }
192}
193
194
195static void modinit (lua_State *L, const char *modname) {
196 const char *dot;
197 lua_pushvalue(L, -1);
198 lua_setfield(L, -2, "_M"); /* module._M = module */
199 lua_pushstring(L, modname);
200 lua_setfield(L, -2, "_NAME");
201 dot = strrchr(modname, '.'); /* look for last dot in module name */
202 if (dot == NULL) dot = modname;
203 else dot++;
204 /* set _PACKAGE as package name (full module name minus last part) */
205 lua_pushlstring(L, modname, dot - modname);
206 lua_setfield(L, -2, "_PACKAGE");
207}
208
209
210static int ll_module (lua_State *L) {
211 const char *modname = luaL_checkstring(L, 1);
212 int loaded = lua_gettop(L) + 1; /* index of _LOADED table */
213 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
214 lua_getfield(L, loaded, modname); /* get _LOADED[modname] */
215 if (!lua_istable(L, -1)) { /* not found? */
216 lua_pop(L, 1); /* remove previous result */
217 /* try global variable (and create one if it does not exist) */
218 if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
219 return luaL_error(L, "name conflict for module " LUA_QS, modname);
220 lua_pushvalue(L, -1);
221 lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */
222 }
223 /* check whether table already has a _NAME field */
224 lua_getfield(L, -1, "_NAME");
225 if (!lua_isnil(L, -1)) /* is table an initialized module? */
226 lua_pop(L, 1);
227 else { /* no; initialize it */
228 lua_pop(L, 1);
229 modinit(L, modname);
230 }
231 lua_pushvalue(L, -1);
232 setfenv(L);
233 dooptions(L, loaded - 1);
234 return 0;
235}
236
237
238static int ll_seeall (lua_State *L) {
239 luaL_checktype(L, 1, LUA_TTABLE);
240 if (!lua_getmetatable(L, 1)) {
241 lua_createtable(L, 0, 1); /* create new metatable */
242 lua_pushvalue(L, -1);
243 lua_setmetatable(L, 1);
244 }
245 lua_pushvalue(L, LUA_GLOBALSINDEX);
246 lua_setfield(L, -2, "__index"); /* mt.__index = _G */
247 return 0;
248}
249
250
251/* }====================================================== */
252
253
254
255/* auxiliary mark (for internal use) */
256#define AUXMARK "\1"
257
258static void setpath (lua_State *L, const char *fieldname, const char *envname,
259 const char *def) {
260 (void)envname;
261 lua_pushstring(L, def); /* use default */
262 setprogdir(L);
263 lua_setfield(L, -2, fieldname);
264}
265
266
267static const luaL_Reg pk_funcs[] = {
268 {"seeall", ll_seeall},
269 {NULL, NULL}
270};
271
272
273static const luaL_Reg ll_funcs[] = {
274 {"module", ll_module},
275 {"require", ll_require},
276 {NULL, NULL}
277};
278
279
280static const lua_CFunction loaders[] =
281 {loader_preload, loader_Lua, NULL};
282
283
284LUALIB_API int luaopen_package (lua_State *L) {
285 int i;
286 /* create new type _LOADLIB */
287 luaL_newmetatable(L, "_LOADLIB");
288 /* create `package' table */
289 luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
290#if defined(LUA_COMPAT_LOADLIB)
291 lua_getfield(L, -1, "loadlib");
292 lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
293#endif
294 lua_pushvalue(L, -1);
295 lua_replace(L, LUA_ENVIRONINDEX);
296 /* create `loaders' table */
297 lua_createtable(L, sizeof(loaders)/sizeof(loaders[0]) - 1, 0);
298 /* fill it with pre-defined loaders */
299 for (i=0; loaders[i] != NULL; i++) {
300 lua_pushcfunction(L, loaders[i]);
301 lua_rawseti(L, -2, i+1);
302 }
303 lua_setfield(L, -2, "loaders"); /* put it in field `loaders' */
304 setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT); /* set field `path' */
305 /* store config information */
306 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
307 LUA_EXECDIR "\n" LUA_IGMARK);
308 lua_setfield(L, -2, "config");
309 /* set field `loaded' */
310 luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
311 lua_setfield(L, -2, "loaded");
312 /* set field `preload' */
313 lua_newtable(L);
314 lua_setfield(L, -2, "preload");
315 lua_pushvalue(L, LUA_GLOBALSINDEX);
316 luaL_register(L, NULL, ll_funcs); /* open lib into global table */
317 lua_pop(L, 1);
318 return 1; /* return 'package' table */
319}
320