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1087
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1 /*
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2 ** $Id: loadlib.c,v 1.111 2012/05/30 12:33:44 roberto Exp $
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3 ** Dynamic library loader for Lua
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4 ** See Copyright Notice in lua.h
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5 **
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6 ** This module contains an implementation of loadlib for Unix systems
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7 ** that have dlfcn, an implementation for Windows, and a stub for other
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8 ** systems.
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9 */
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10
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11
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12 /*
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13 ** if needed, includes windows header before everything else
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14 */
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15 #if defined(_WIN32)
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16 #include <windows.h>
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17 #endif
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18
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19
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20 #include <stdlib.h>
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21 #include <string.h>
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22
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23
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24 #define loadlib_c
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25 #define LUA_LIB
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26
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27 #include "lua.h"
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28
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29 #include "lauxlib.h"
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30 #include "lualib.h"
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31
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32
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33 /*
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34 ** LUA_PATH and LUA_CPATH are the names of the environment
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35 ** variables that Lua check to set its paths.
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36 */
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37 #if !defined(LUA_PATH)
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38 #define LUA_PATH "LUA_PATH"
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39 #endif
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40
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41 #if !defined(LUA_CPATH)
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42 #define LUA_CPATH "LUA_CPATH"
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43 #endif
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44
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45 #define LUA_PATHSUFFIX "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
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46
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47 #define LUA_PATHVERSION LUA_PATH LUA_PATHSUFFIX
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48 #define LUA_CPATHVERSION LUA_CPATH LUA_PATHSUFFIX
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49
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50 /*
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51 ** LUA_PATH_SEP is the character that separates templates in a path.
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52 ** LUA_PATH_MARK is the string that marks the substitution points in a
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53 ** template.
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54 ** LUA_EXEC_DIR in a Windows path is replaced by the executable's
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55 ** directory.
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56 ** LUA_IGMARK is a mark to ignore all before it when building the
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57 ** luaopen_ function name.
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58 */
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59 #if !defined (LUA_PATH_SEP)
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60 #define LUA_PATH_SEP ";"
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61 #endif
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62 #if !defined (LUA_PATH_MARK)
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63 #define LUA_PATH_MARK "?"
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64 #endif
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65 #if !defined (LUA_EXEC_DIR)
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66 #define LUA_EXEC_DIR "!"
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67 #endif
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68 #if !defined (LUA_IGMARK)
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69 #define LUA_IGMARK "-"
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70 #endif
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71
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72
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73 /*
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74 ** LUA_CSUBSEP is the character that replaces dots in submodule names
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75 ** when searching for a C loader.
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76 ** LUA_LSUBSEP is the character that replaces dots in submodule names
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77 ** when searching for a Lua loader.
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78 */
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79 #if !defined(LUA_CSUBSEP)
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80 #define LUA_CSUBSEP LUA_DIRSEP
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81 #endif
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82
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83 #if !defined(LUA_LSUBSEP)
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84 #define LUA_LSUBSEP LUA_DIRSEP
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85 #endif
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86
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87
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88 /* prefix for open functions in C libraries */
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89 #define LUA_POF "luaopen_"
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90
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91 /* separator for open functions in C libraries */
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92 #define LUA_OFSEP "_"
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93
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94
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95 /* table (in the registry) that keeps handles for all loaded C libraries */
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96 #define CLIBS "_CLIBS"
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97
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98 #define LIB_FAIL "open"
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99
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100
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101 /* error codes for ll_loadfunc */
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102 #define ERRLIB 1
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103 #define ERRFUNC 2
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104
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105 #define setprogdir(L) ((void)0)
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106
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107
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108 /*
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109 ** system-dependent functions
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110 */
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111 static void ll_unloadlib (void *lib);
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112 static void *ll_load (lua_State *L, const char *path, int seeglb);
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113 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
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114
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115
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116
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117 #if defined(LUA_USE_DLOPEN)
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118 /*
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119 ** {========================================================================
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120 ** This is an implementation of loadlib based on the dlfcn interface.
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121 ** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
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122 ** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
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123 ** as an emulation layer on top of native functions.
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124 ** =========================================================================
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125 */
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126
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127 #include <dlfcn.h>
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128
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129 static void ll_unloadlib (void *lib) {
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130 dlclose(lib);
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131 }
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132
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133
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134 static void *ll_load (lua_State *L, const char *path, int seeglb) {
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135 void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));
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136 if (lib == NULL) lua_pushstring(L, dlerror());
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137 return lib;
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138 }
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139
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140
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141 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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142 lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
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143 if (f == NULL) lua_pushstring(L, dlerror());
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144 return f;
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145 }
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146
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147 /* }====================================================== */
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148
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149
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150
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151 #elif defined(LUA_DL_DLL)
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152 /*
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153 ** {======================================================================
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154 ** This is an implementation of loadlib for Windows using native functions.
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155 ** =======================================================================
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156 */
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157
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158 #undef setprogdir
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159
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160 /*
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161 ** optional flags for LoadLibraryEx
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162 */
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163 #if !defined(LUA_LLE_FLAGS)
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164 #define LUA_LLE_FLAGS 0
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165 #endif
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166
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167
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168 static void setprogdir (lua_State *L) {
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169 char buff[MAX_PATH + 1];
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170 char *lb;
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171 DWORD nsize = sizeof(buff)/sizeof(char);
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172 DWORD n = GetModuleFileNameA(NULL, buff, nsize);
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173 if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
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174 luaL_error(L, "unable to get ModuleFileName");
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175 else {
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176 *lb = '\0';
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177 luaL_gsub(L, lua_tostring(L, -1), LUA_EXEC_DIR, buff);
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178 lua_remove(L, -2); /* remove original string */
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179 }
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180 }
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181
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182
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183 static void pusherror (lua_State *L) {
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184 int error = GetLastError();
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185 char buffer[128];
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186 if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
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187 NULL, error, 0, buffer, sizeof(buffer)/sizeof(char), NULL))
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188 lua_pushstring(L, buffer);
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189 else
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190 lua_pushfstring(L, "system error %d\n", error);
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191 }
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192
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193 static void ll_unloadlib (void *lib) {
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194 FreeLibrary((HMODULE)lib);
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195 }
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196
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197
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198 static void *ll_load (lua_State *L, const char *path, int seeglb) {
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199 HMODULE lib = LoadLibraryExA(path, NULL, LUA_LLE_FLAGS);
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200 (void)(seeglb); /* not used: symbols are 'global' by default */
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201 if (lib == NULL) pusherror(L);
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202 return lib;
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203 }
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204
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205
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206 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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207 lua_CFunction f = (lua_CFunction)GetProcAddress((HMODULE)lib, sym);
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208 if (f == NULL) pusherror(L);
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209 return f;
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210 }
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211
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212 /* }====================================================== */
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213
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214
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215 #else
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216 /*
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217 ** {======================================================
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218 ** Fallback for other systems
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219 ** =======================================================
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220 */
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221
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222 #undef LIB_FAIL
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223 #define LIB_FAIL "absent"
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224
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225
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226 #define DLMSG "dynamic libraries not enabled; check your Lua installation"
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227
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228
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229 static void ll_unloadlib (void *lib) {
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230 (void)(lib); /* not used */
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231 }
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232
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233
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234 static void *ll_load (lua_State *L, const char *path, int seeglb) {
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235 (void)(path); (void)(seeglb); /* not used */
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236 lua_pushliteral(L, DLMSG);
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237 return NULL;
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238 }
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239
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240
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241 static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
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242 (void)(lib); (void)(sym); /* not used */
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243 lua_pushliteral(L, DLMSG);
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244 return NULL;
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245 }
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246
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247 /* }====================================================== */
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248 #endif
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249
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250
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251 static void *ll_checkclib (lua_State *L, const char *path) {
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252 void *plib;
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253 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
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254 lua_getfield(L, -1, path);
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255 plib = lua_touserdata(L, -1); /* plib = CLIBS[path] */
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256 lua_pop(L, 2); /* pop CLIBS table and 'plib' */
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257 return plib;
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258 }
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259
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260
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261 static void ll_addtoclib (lua_State *L, const char *path, void *plib) {
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262 lua_getfield(L, LUA_REGISTRYINDEX, CLIBS);
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263 lua_pushlightuserdata(L, plib);
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264 lua_pushvalue(L, -1);
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265 lua_setfield(L, -3, path); /* CLIBS[path] = plib */
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266 lua_rawseti(L, -2, luaL_len(L, -2) + 1); /* CLIBS[#CLIBS + 1] = plib */
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267 lua_pop(L, 1); /* pop CLIBS table */
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268 }
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269
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270
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271 /*
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272 ** __gc tag method for CLIBS table: calls 'll_unloadlib' for all lib
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273 ** handles in list CLIBS
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274 */
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275 static int gctm (lua_State *L) {
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276 int n = luaL_len(L, 1);
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277 for (; n >= 1; n--) { /* for each handle, in reverse order */
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278 lua_rawgeti(L, 1, n); /* get handle CLIBS[n] */
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279 ll_unloadlib(lua_touserdata(L, -1));
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280 lua_pop(L, 1); /* pop handle */
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281 }
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282 return 0;
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283 }
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284
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285
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286 static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
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287 void *reg = ll_checkclib(L, path); /* check loaded C libraries */
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288 if (reg == NULL) { /* must load library? */
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289 reg = ll_load(L, path, *sym == '*');
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290 if (reg == NULL) return ERRLIB; /* unable to load library */
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291 ll_addtoclib(L, path, reg);
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292 }
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293 if (*sym == '*') { /* loading only library (no function)? */
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294 lua_pushboolean(L, 1); /* return 'true' */
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295 return 0; /* no errors */
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296 }
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297 else {
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298 lua_CFunction f = ll_sym(L, reg, sym);
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299 if (f == NULL)
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300 return ERRFUNC; /* unable to find function */
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301 lua_pushcfunction(L, f); /* else create new function */
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302 return 0; /* no errors */
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303 }
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304 }
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305
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306
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307 static int ll_loadlib (lua_State *L) {
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308 const char *path = luaL_checkstring(L, 1);
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309 const char *init = luaL_checkstring(L, 2);
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310 int stat = ll_loadfunc(L, path, init);
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311 if (stat == 0) /* no errors? */
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312 return 1; /* return the loaded function */
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313 else { /* error; error message is on stack top */
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314 lua_pushnil(L);
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315 lua_insert(L, -2);
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316 lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");
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317 return 3; /* return nil, error message, and where */
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318 }
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319 }
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320
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321
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322
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323 /*
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324 ** {======================================================
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325 ** 'require' function
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326 ** =======================================================
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327 */
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328
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329
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330 static int readable (const char *filename) {
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331 FILE *f = fopen(filename, "r"); /* try to open file */
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332 if (f == NULL) return 0; /* open failed */
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333 fclose(f);
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334 return 1;
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335 }
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336
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337
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338 static const char *pushnexttemplate (lua_State *L, const char *path) {
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339 const char *l;
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340 while (*path == *LUA_PATH_SEP) path++; /* skip separators */
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341 if (*path == '\0') return NULL; /* no more templates */
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342 l = strchr(path, *LUA_PATH_SEP); /* find next separator */
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343 if (l == NULL) l = path + strlen(path);
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344 lua_pushlstring(L, path, l - path); /* template */
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345 return l;
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346 }
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347
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348
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349 static const char *searchpath (lua_State *L, const char *name,
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350 const char *path,
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351 const char *sep,
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352 const char *dirsep) {
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353 luaL_Buffer msg; /* to build error message */
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354 luaL_buffinit(L, &msg);
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355 if (*sep != '\0') /* non-empty separator? */
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356 name = luaL_gsub(L, name, sep, dirsep); /* replace it by 'dirsep' */
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357 while ((path = pushnexttemplate(L, path)) != NULL) {
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358 const char *filename = luaL_gsub(L, lua_tostring(L, -1),
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359 LUA_PATH_MARK, name);
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360 lua_remove(L, -2); /* remove path template */
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361 if (readable(filename)) /* does file exist and is readable? */
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362 return filename; /* return that file name */
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363 lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
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364 lua_remove(L, -2); /* remove file name */
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365 luaL_addvalue(&msg); /* concatenate error msg. entry */
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366 }
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367 luaL_pushresult(&msg); /* create error message */
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368 return NULL; /* not found */
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369 }
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370
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371
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372 static int ll_searchpath (lua_State *L) {
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373 const char *f = searchpath(L, luaL_checkstring(L, 1),
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374 luaL_checkstring(L, 2),
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375 luaL_optstring(L, 3, "."),
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376 luaL_optstring(L, 4, LUA_DIRSEP));
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377 if (f != NULL) return 1;
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378 else { /* error message is on top of the stack */
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379 lua_pushnil(L);
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380 lua_insert(L, -2);
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381 return 2; /* return nil + error message */
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382 }
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383 }
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384
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385
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386 static const char *findfile (lua_State *L, const char *name,
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387 const char *pname,
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388 const char *dirsep) {
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389 const char *path;
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390 lua_getfield(L, lua_upvalueindex(1), pname);
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391 path = lua_tostring(L, -1);
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392 if (path == NULL)
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393 luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
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394 return searchpath(L, name, path, ".", dirsep);
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395 }
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396
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397
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398 static int checkload (lua_State *L, int stat, const char *filename) {
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399 if (stat) { /* module loaded successfully? */
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400 lua_pushstring(L, filename); /* will be 2nd argument to module */
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401 return 2; /* return open function and file name */
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402 }
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403 else
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404 return luaL_error(L, "error loading module " LUA_QS
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405 " from file " LUA_QS ":\n\t%s",
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406 lua_tostring(L, 1), filename, lua_tostring(L, -1));
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407 }
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408
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409
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410 static int searcher_Lua (lua_State *L) {
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411 const char *filename;
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412 const char *name = luaL_checkstring(L, 1);
|
|
|
413 filename = findfile(L, name, "path", LUA_LSUBSEP);
|
|
|
414 if (filename == NULL) return 1; /* module not found in this path */
|
|
|
415 return checkload(L, (luaL_loadfile(L, filename) == LUA_OK), filename);
|
|
|
416 }
|
|
|
417
|
|
|
418
|
|
|
419 static int loadfunc (lua_State *L, const char *filename, const char *modname) {
|
|
|
420 const char *funcname;
|
|
|
421 const char *mark;
|
|
|
422 modname = luaL_gsub(L, modname, ".", LUA_OFSEP);
|
|
|
423 mark = strchr(modname, *LUA_IGMARK);
|
|
|
424 if (mark) {
|
|
|
425 int stat;
|
|
|
426 funcname = lua_pushlstring(L, modname, mark - modname);
|
|
|
427 funcname = lua_pushfstring(L, LUA_POF"%s", funcname);
|
|
|
428 stat = ll_loadfunc(L, filename, funcname);
|
|
|
429 if (stat != ERRFUNC) return stat;
|
|
|
430 modname = mark + 1; /* else go ahead and try old-style name */
|
|
|
431 }
|
|
|
432 funcname = lua_pushfstring(L, LUA_POF"%s", modname);
|
|
|
433 return ll_loadfunc(L, filename, funcname);
|
|
|
434 }
|
|
|
435
|
|
|
436
|
|
|
437 static int searcher_C (lua_State *L) {
|
|
|
438 const char *name = luaL_checkstring(L, 1);
|
|
|
439 const char *filename = findfile(L, name, "cpath", LUA_CSUBSEP);
|
|
|
440 if (filename == NULL) return 1; /* module not found in this path */
|
|
|
441 return checkload(L, (loadfunc(L, filename, name) == 0), filename);
|
|
|
442 }
|
|
|
443
|
|
|
444
|
|
|
445 static int searcher_Croot (lua_State *L) {
|
|
|
446 const char *filename;
|
|
|
447 const char *name = luaL_checkstring(L, 1);
|
|
|
448 const char *p = strchr(name, '.');
|
|
|
449 int stat;
|
|
|
450 if (p == NULL) return 0; /* is root */
|
|
|
451 lua_pushlstring(L, name, p - name);
|
|
|
452 filename = findfile(L, lua_tostring(L, -1), "cpath", LUA_CSUBSEP);
|
|
|
453 if (filename == NULL) return 1; /* root not found */
|
|
|
454 if ((stat = loadfunc(L, filename, name)) != 0) {
|
|
|
455 if (stat != ERRFUNC)
|
|
|
456 return checkload(L, 0, filename); /* real error */
|
|
|
457 else { /* open function not found */
|
|
|
458 lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
|
|
|
459 name, filename);
|
|
|
460 return 1;
|
|
|
461 }
|
|
|
462 }
|
|
|
463 lua_pushstring(L, filename); /* will be 2nd argument to module */
|
|
|
464 return 2;
|
|
|
465 }
|
|
|
466
|
|
|
467
|
|
|
468 static int searcher_preload (lua_State *L) {
|
|
|
469 const char *name = luaL_checkstring(L, 1);
|
|
|
470 lua_getfield(L, LUA_REGISTRYINDEX, "_PRELOAD");
|
|
|
471 lua_getfield(L, -1, name);
|
|
|
472 if (lua_isnil(L, -1)) /* not found? */
|
|
|
473 lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
|
|
|
474 return 1;
|
|
|
475 }
|
|
|
476
|
|
|
477
|
|
|
478 static void findloader (lua_State *L, const char *name) {
|
|
|
479 int i;
|
|
|
480 luaL_Buffer msg; /* to build error message */
|
|
|
481 luaL_buffinit(L, &msg);
|
|
|
482 lua_getfield(L, lua_upvalueindex(1), "searchers"); /* will be at index 3 */
|
|
|
483 if (!lua_istable(L, 3))
|
|
|
484 luaL_error(L, LUA_QL("package.searchers") " must be a table");
|
|
|
485 /* iterate over available searchers to find a loader */
|
|
|
486 for (i = 1; ; i++) {
|
|
|
487 lua_rawgeti(L, 3, i); /* get a searcher */
|
|
|
488 if (lua_isnil(L, -1)) { /* no more searchers? */
|
|
|
489 lua_pop(L, 1); /* remove nil */
|
|
|
490 luaL_pushresult(&msg); /* create error message */
|
|
|
491 luaL_error(L, "module " LUA_QS " not found:%s",
|
|
|
492 name, lua_tostring(L, -1));
|
|
|
493 }
|
|
|
494 lua_pushstring(L, name);
|
|
|
495 lua_call(L, 1, 2); /* call it */
|
|
|
496 if (lua_isfunction(L, -2)) /* did it find a loader? */
|
|
|
497 return; /* module loader found */
|
|
|
498 else if (lua_isstring(L, -2)) { /* searcher returned error message? */
|
|
|
499 lua_pop(L, 1); /* remove extra return */
|
|
|
500 luaL_addvalue(&msg); /* concatenate error message */
|
|
|
501 }
|
|
|
502 else
|
|
|
503 lua_pop(L, 2); /* remove both returns */
|
|
|
504 }
|
|
|
505 }
|
|
|
506
|
|
|
507
|
|
|
508 static int ll_require (lua_State *L) {
|
|
|
509 const char *name = luaL_checkstring(L, 1);
|
|
|
510 lua_settop(L, 1); /* _LOADED table will be at index 2 */
|
|
|
511 lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
|
|
|
512 lua_getfield(L, 2, name); /* _LOADED[name] */
|
|
|
513 if (lua_toboolean(L, -1)) /* is it there? */
|
|
|
514 return 1; /* package is already loaded */
|
|
|
515 /* else must load package */
|
|
|
516 lua_pop(L, 1); /* remove 'getfield' result */
|
|
|
517 findloader(L, name);
|
|
|
518 lua_pushstring(L, name); /* pass name as argument to module loader */
|
|
|
519 lua_insert(L, -2); /* name is 1st argument (before search data) */
|
|
|
520 lua_call(L, 2, 1); /* run loader to load module */
|
|
|
521 if (!lua_isnil(L, -1)) /* non-nil return? */
|
|
|
522 lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
|
|
|
523 lua_getfield(L, 2, name);
|
|
|
524 if (lua_isnil(L, -1)) { /* module did not set a value? */
|
|
|
525 lua_pushboolean(L, 1); /* use true as result */
|
|
|
526 lua_pushvalue(L, -1); /* extra copy to be returned */
|
|
|
527 lua_setfield(L, 2, name); /* _LOADED[name] = true */
|
|
|
528 }
|
|
|
529 return 1;
|
|
|
530 }
|
|
|
531
|
|
|
532 /* }====================================================== */
|
|
|
533
|
|
|
534
|
|
|
535
|
|
|
536 /*
|
|
|
537 ** {======================================================
|
|
|
538 ** 'module' function
|
|
|
539 ** =======================================================
|
|
|
540 */
|
|
|
541 #if defined(LUA_COMPAT_MODULE)
|
|
|
542
|
|
|
543 /*
|
|
|
544 ** changes the environment variable of calling function
|
|
|
545 */
|
|
|
546 static void set_env (lua_State *L) {
|
|
|
547 lua_Debug ar;
|
|
|
548 if (lua_getstack(L, 1, &ar) == 0 ||
|
|
|
549 lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
|
|
|
550 lua_iscfunction(L, -1))
|
|
|
551 luaL_error(L, LUA_QL("module") " not called from a Lua function");
|
|
|
552 lua_pushvalue(L, -2); /* copy new environment table to top */
|
|
|
553 lua_setupvalue(L, -2, 1);
|
|
|
554 lua_pop(L, 1); /* remove function */
|
|
|
555 }
|
|
|
556
|
|
|
557
|
|
|
558 static void dooptions (lua_State *L, int n) {
|
|
|
559 int i;
|
|
|
560 for (i = 2; i <= n; i++) {
|
|
|
561 if (lua_isfunction(L, i)) { /* avoid 'calling' extra info. */
|
|
|
562 lua_pushvalue(L, i); /* get option (a function) */
|
|
|
563 lua_pushvalue(L, -2); /* module */
|
|
|
564 lua_call(L, 1, 0);
|
|
|
565 }
|
|
|
566 }
|
|
|
567 }
|
|
|
568
|
|
|
569
|
|
|
570 static void modinit (lua_State *L, const char *modname) {
|
|
|
571 const char *dot;
|
|
|
572 lua_pushvalue(L, -1);
|
|
|
573 lua_setfield(L, -2, "_M"); /* module._M = module */
|
|
|
574 lua_pushstring(L, modname);
|
|
|
575 lua_setfield(L, -2, "_NAME");
|
|
|
576 dot = strrchr(modname, '.'); /* look for last dot in module name */
|
|
|
577 if (dot == NULL) dot = modname;
|
|
|
578 else dot++;
|
|
|
579 /* set _PACKAGE as package name (full module name minus last part) */
|
|
|
580 lua_pushlstring(L, modname, dot - modname);
|
|
|
581 lua_setfield(L, -2, "_PACKAGE");
|
|
|
582 }
|
|
|
583
|
|
|
584
|
|
|
585 static int ll_module (lua_State *L) {
|
|
|
586 const char *modname = luaL_checkstring(L, 1);
|
|
|
587 int lastarg = lua_gettop(L); /* last parameter */
|
|
|
588 luaL_pushmodule(L, modname, 1); /* get/create module table */
|
|
|
589 /* check whether table already has a _NAME field */
|
|
|
590 lua_getfield(L, -1, "_NAME");
|
|
|
591 if (!lua_isnil(L, -1)) /* is table an initialized module? */
|
|
|
592 lua_pop(L, 1);
|
|
|
593 else { /* no; initialize it */
|
|
|
594 lua_pop(L, 1);
|
|
|
595 modinit(L, modname);
|
|
|
596 }
|
|
|
597 lua_pushvalue(L, -1);
|
|
|
598 set_env(L);
|
|
|
599 dooptions(L, lastarg);
|
|
|
600 return 1;
|
|
|
601 }
|
|
|
602
|
|
|
603
|
|
|
604 static int ll_seeall (lua_State *L) {
|
|
|
605 luaL_checktype(L, 1, LUA_TTABLE);
|
|
|
606 if (!lua_getmetatable(L, 1)) {
|
|
|
607 lua_createtable(L, 0, 1); /* create new metatable */
|
|
|
608 lua_pushvalue(L, -1);
|
|
|
609 lua_setmetatable(L, 1);
|
|
|
610 }
|
|
|
611 lua_pushglobaltable(L);
|
|
|
612 lua_setfield(L, -2, "__index"); /* mt.__index = _G */
|
|
|
613 return 0;
|
|
|
614 }
|
|
|
615
|
|
|
616 #endif
|
|
|
617 /* }====================================================== */
|
|
|
618
|
|
|
619
|
|
|
620
|
|
|
621 /* auxiliary mark (for internal use) */
|
|
|
622 #define AUXMARK "\1"
|
|
|
623
|
|
|
624
|
|
|
625 /*
|
|
|
626 ** return registry.LUA_NOENV as a boolean
|
|
|
627 */
|
|
|
628 static int noenv (lua_State *L) {
|
|
|
629 int b;
|
|
|
630 lua_getfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
|
|
|
631 b = lua_toboolean(L, -1);
|
|
|
632 lua_pop(L, 1); /* remove value */
|
|
|
633 return b;
|
|
|
634 }
|
|
|
635
|
|
|
636
|
|
|
637 static void setpath (lua_State *L, const char *fieldname, const char *envname1,
|
|
|
638 const char *envname2, const char *def) {
|
|
|
639 const char *path = getenv(envname1);
|
|
|
640 if (path == NULL) /* no environment variable? */
|
|
|
641 path = getenv(envname2); /* try alternative name */
|
|
|
642 if (path == NULL || noenv(L)) /* no environment variable? */
|
|
|
643 lua_pushstring(L, def); /* use default */
|
|
|
644 else {
|
|
|
645 /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
|
|
|
646 path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP,
|
|
|
647 LUA_PATH_SEP AUXMARK LUA_PATH_SEP);
|
|
|
648 luaL_gsub(L, path, AUXMARK, def);
|
|
|
649 lua_remove(L, -2);
|
|
|
650 }
|
|
|
651 setprogdir(L);
|
|
|
652 lua_setfield(L, -2, fieldname);
|
|
|
653 }
|
|
|
654
|
|
|
655
|
|
|
656 static const luaL_Reg pk_funcs[] = {
|
|
|
657 {"loadlib", ll_loadlib},
|
|
|
658 {"searchpath", ll_searchpath},
|
|
|
659 #if defined(LUA_COMPAT_MODULE)
|
|
|
660 {"seeall", ll_seeall},
|
|
|
661 #endif
|
|
|
662 {NULL, NULL}
|
|
|
663 };
|
|
|
664
|
|
|
665
|
|
|
666 static const luaL_Reg ll_funcs[] = {
|
|
|
667 #if defined(LUA_COMPAT_MODULE)
|
|
|
668 {"module", ll_module},
|
|
|
669 #endif
|
|
|
670 {"require", ll_require},
|
|
|
671 {NULL, NULL}
|
|
|
672 };
|
|
|
673
|
|
|
674
|
|
|
675 static void createsearcherstable (lua_State *L) {
|
|
|
676 static const lua_CFunction searchers[] =
|
|
|
677 {searcher_preload, searcher_Lua, searcher_C, searcher_Croot, NULL};
|
|
|
678 int i;
|
|
|
679 /* create 'searchers' table */
|
|
|
680 lua_createtable(L, sizeof(searchers)/sizeof(searchers[0]) - 1, 0);
|
|
|
681 /* fill it with pre-defined searchers */
|
|
|
682 for (i=0; searchers[i] != NULL; i++) {
|
|
|
683 lua_pushvalue(L, -2); /* set 'package' as upvalue for all searchers */
|
|
|
684 lua_pushcclosure(L, searchers[i], 1);
|
|
|
685 lua_rawseti(L, -2, i+1);
|
|
|
686 }
|
|
|
687 }
|
|
|
688
|
|
|
689
|
|
|
690 LUAMOD_API int luaopen_package (lua_State *L) {
|
|
|
691 /* create table CLIBS to keep track of loaded C libraries */
|
|
|
692 luaL_getsubtable(L, LUA_REGISTRYINDEX, CLIBS);
|
|
|
693 lua_createtable(L, 0, 1); /* metatable for CLIBS */
|
|
|
694 lua_pushcfunction(L, gctm);
|
|
|
695 lua_setfield(L, -2, "__gc"); /* set finalizer for CLIBS table */
|
|
|
696 lua_setmetatable(L, -2);
|
|
|
697 /* create `package' table */
|
|
|
698 luaL_newlib(L, pk_funcs);
|
|
|
699 createsearcherstable(L);
|
|
|
700 #if defined(LUA_COMPAT_LOADERS)
|
|
|
701 lua_pushvalue(L, -1); /* make a copy of 'searchers' table */
|
|
|
702 lua_setfield(L, -3, "loaders"); /* put it in field `loaders' */
|
|
|
703 #endif
|
|
|
704 lua_setfield(L, -2, "searchers"); /* put it in field 'searchers' */
|
|
|
705 /* set field 'path' */
|
|
|
706 setpath(L, "path", LUA_PATHVERSION, LUA_PATH, LUA_PATH_DEFAULT);
|
|
|
707 /* set field 'cpath' */
|
|
|
708 setpath(L, "cpath", LUA_CPATHVERSION, LUA_CPATH, LUA_CPATH_DEFAULT);
|
|
|
709 /* store config information */
|
|
|
710 lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATH_SEP "\n" LUA_PATH_MARK "\n"
|
|
|
711 LUA_EXEC_DIR "\n" LUA_IGMARK "\n");
|
|
|
712 lua_setfield(L, -2, "config");
|
|
|
713 /* set field `loaded' */
|
|
|
714 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
|
|
|
715 lua_setfield(L, -2, "loaded");
|
|
|
716 /* set field `preload' */
|
|
|
717 luaL_getsubtable(L, LUA_REGISTRYINDEX, "_PRELOAD");
|
|
|
718 lua_setfield(L, -2, "preload");
|
|
|
719 lua_pushglobaltable(L);
|
|
|
720 lua_pushvalue(L, -2); /* set 'package' as upvalue for next lib */
|
|
|
721 luaL_setfuncs(L, ll_funcs, 1); /* open lib into global table */
|
|
|
722 lua_pop(L, 1); /* pop global table */
|
|
|
723 return 1; /* return 'package' table */
|
|
|
724 }
|
|
|
725
|
