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1087
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1 /*
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2 ** $Id: lua.c,v 1.205 2012/05/23 15:37:09 roberto Exp $
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3 ** Lua stand-alone interpreter
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7
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8 #include <signal.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12
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13 #define lua_c
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14
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15 #include "lua.h"
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16
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17 #include "lauxlib.h"
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18 #include "lualib.h"
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19
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20
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21 #if !defined(LUA_PROMPT)
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22 #define LUA_PROMPT "> "
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23 #define LUA_PROMPT2 ">> "
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24 #endif
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25
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26 #if !defined(LUA_PROGNAME)
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27 #define LUA_PROGNAME "lua"
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28 #endif
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29
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30 #if !defined(LUA_MAXINPUT)
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31 #define LUA_MAXINPUT 512
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32 #endif
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33
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34 #if !defined(LUA_INIT)
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35 #define LUA_INIT "LUA_INIT"
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36 #endif
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37
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38 #define LUA_INITVERSION \
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39 LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
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40
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41
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42 /*
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43 ** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
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44 ** is, whether we're running lua interactively).
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45 */
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46 #if defined(LUA_USE_ISATTY)
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47 #include <unistd.h>
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48 #define lua_stdin_is_tty() isatty(0)
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49 #elif defined(LUA_WIN)
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50 #include <io.h>
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51 #include <stdio.h>
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52 #define lua_stdin_is_tty() _isatty(_fileno(stdin))
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53 #else
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54 #define lua_stdin_is_tty() 1 /* assume stdin is a tty */
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55 #endif
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56
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57
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58 /*
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59 ** lua_readline defines how to show a prompt and then read a line from
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60 ** the standard input.
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61 ** lua_saveline defines how to "save" a read line in a "history".
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62 ** lua_freeline defines how to free a line read by lua_readline.
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63 */
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64 #if defined(LUA_USE_READLINE)
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65
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66 #include <stdio.h>
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67 #include <readline/readline.h>
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68 #include <readline/history.h>
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69 #define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
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70 #define lua_saveline(L,idx) \
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71 if (lua_rawlen(L,idx) > 0) /* non-empty line? */ \
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72 add_history(lua_tostring(L, idx)); /* add it to history */
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73 #define lua_freeline(L,b) ((void)L, free(b))
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74
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75 #elif !defined(lua_readline)
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76
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77 #define lua_readline(L,b,p) \
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78 ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
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79 fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
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80 #define lua_saveline(L,idx) { (void)L; (void)idx; }
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81 #define lua_freeline(L,b) { (void)L; (void)b; }
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82
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83 #endif
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84
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85
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86
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87
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88 static lua_State *globalL = NULL;
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89
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90 static const char *progname = LUA_PROGNAME;
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91
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92
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93
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94 static void lstop (lua_State *L, lua_Debug *ar) {
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95 (void)ar; /* unused arg. */
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96 lua_sethook(L, NULL, 0, 0);
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97 luaL_error(L, "interrupted!");
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98 }
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99
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100
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101 static void laction (int i) {
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102 signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
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103 terminate process (default action) */
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104 lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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105 }
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106
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107
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108 static void print_usage (const char *badoption) {
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109 luai_writestringerror("%s: ", progname);
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110 if (badoption[1] == 'e' || badoption[1] == 'l')
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111 luai_writestringerror("'%s' needs argument\n", badoption);
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112 else
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113 luai_writestringerror("unrecognized option '%s'\n", badoption);
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114 luai_writestringerror(
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115 "usage: %s [options] [script [args]]\n"
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116 "Available options are:\n"
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117 " -e stat execute string " LUA_QL("stat") "\n"
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118 " -i enter interactive mode after executing " LUA_QL("script") "\n"
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119 " -l name require library " LUA_QL("name") "\n"
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120 " -v show version information\n"
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121 " -E ignore environment variables\n"
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122 " -- stop handling options\n"
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123 " - stop handling options and execute stdin\n"
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124 ,
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125 progname);
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126 }
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127
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128
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129 static void l_message (const char *pname, const char *msg) {
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130 if (pname) luai_writestringerror("%s: ", pname);
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131 luai_writestringerror("%s\n", msg);
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132 }
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133
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134
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135 static int report (lua_State *L, int status) {
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136 if (status != LUA_OK && !lua_isnil(L, -1)) {
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137 const char *msg = lua_tostring(L, -1);
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138 if (msg == NULL) msg = "(error object is not a string)";
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139 l_message(progname, msg);
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140 lua_pop(L, 1);
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141 /* force a complete garbage collection in case of errors */
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142 lua_gc(L, LUA_GCCOLLECT, 0);
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143 }
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144 return status;
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145 }
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146
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147
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148 /* the next function is called unprotected, so it must avoid errors */
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149 static void finalreport (lua_State *L, int status) {
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150 if (status != LUA_OK) {
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151 const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
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152 : NULL;
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153 if (msg == NULL) msg = "(error object is not a string)";
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154 l_message(progname, msg);
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155 lua_pop(L, 1);
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156 }
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157 }
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158
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159
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160 static int traceback (lua_State *L) {
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161 const char *msg = lua_tostring(L, 1);
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162 if (msg)
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163 luaL_traceback(L, L, msg, 1);
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164 else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
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165 if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
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166 lua_pushliteral(L, "(no error message)");
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167 }
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168 return 1;
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169 }
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170
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171
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172 static int docall (lua_State *L, int narg, int nres) {
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173 int status;
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174 int base = lua_gettop(L) - narg; /* function index */
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175 lua_pushcfunction(L, traceback); /* push traceback function */
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176 lua_insert(L, base); /* put it under chunk and args */
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177 globalL = L; /* to be available to 'laction' */
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178 signal(SIGINT, laction);
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179 status = lua_pcall(L, narg, nres, base);
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180 signal(SIGINT, SIG_DFL);
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181 lua_remove(L, base); /* remove traceback function */
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182 return status;
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183 }
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184
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185
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186 static void print_version (void) {
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187 luai_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
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188 luai_writeline();
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189 }
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190
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191
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192 static int getargs (lua_State *L, char **argv, int n) {
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193 int narg;
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194 int i;
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195 int argc = 0;
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196 while (argv[argc]) argc++; /* count total number of arguments */
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197 narg = argc - (n + 1); /* number of arguments to the script */
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198 luaL_checkstack(L, narg + 3, "too many arguments to script");
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199 for (i=n+1; i < argc; i++)
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200 lua_pushstring(L, argv[i]);
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201 lua_createtable(L, narg, n + 1);
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202 for (i=0; i < argc; i++) {
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203 lua_pushstring(L, argv[i]);
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204 lua_rawseti(L, -2, i - n);
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205 }
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206 return narg;
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207 }
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208
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209
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210 static int dofile (lua_State *L, const char *name) {
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211 int status = luaL_loadfile(L, name);
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212 if (status == LUA_OK) status = docall(L, 0, 0);
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213 return report(L, status);
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214 }
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215
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216
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217 static int dostring (lua_State *L, const char *s, const char *name) {
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218 int status = luaL_loadbuffer(L, s, strlen(s), name);
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219 if (status == LUA_OK) status = docall(L, 0, 0);
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220 return report(L, status);
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221 }
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222
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223
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224 static int dolibrary (lua_State *L, const char *name) {
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225 int status;
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226 lua_getglobal(L, "require");
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227 lua_pushstring(L, name);
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228 status = docall(L, 1, 1); /* call 'require(name)' */
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229 if (status == LUA_OK)
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230 lua_setglobal(L, name); /* global[name] = require return */
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231 return report(L, status);
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232 }
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233
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234
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235 static const char *get_prompt (lua_State *L, int firstline) {
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236 const char *p;
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237 lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
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238 p = lua_tostring(L, -1);
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239 if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
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240 lua_pop(L, 1); /* remove global */
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241 return p;
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242 }
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243
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244 /* mark in error messages for incomplete statements */
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245 #define EOFMARK "<eof>"
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246 #define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
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247
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248 static int incomplete (lua_State *L, int status) {
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249 if (status == LUA_ERRSYNTAX) {
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250 size_t lmsg;
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251 const char *msg = lua_tolstring(L, -1, &lmsg);
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252 if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) {
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253 lua_pop(L, 1);
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254 return 1;
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255 }
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256 }
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257 return 0; /* else... */
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258 }
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259
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260
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261 static int pushline (lua_State *L, int firstline) {
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262 char buffer[LUA_MAXINPUT];
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263 char *b = buffer;
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264 size_t l;
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265 const char *prmt = get_prompt(L, firstline);
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266 if (lua_readline(L, b, prmt) == 0)
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267 return 0; /* no input */
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268 l = strlen(b);
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269 if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
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270 b[l-1] = '\0'; /* remove it */
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271 if (firstline && b[0] == '=') /* first line starts with `=' ? */
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272 lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
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273 else
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274 lua_pushstring(L, b);
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275 lua_freeline(L, b);
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276 return 1;
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277 }
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278
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279
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280 static int loadline (lua_State *L) {
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281 int status;
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282 lua_settop(L, 0);
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283 if (!pushline(L, 1))
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284 return -1; /* no input */
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285 for (;;) { /* repeat until gets a complete line */
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286 size_t l;
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287 const char *line = lua_tolstring(L, 1, &l);
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288 status = luaL_loadbuffer(L, line, l, "=stdin");
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289 if (!incomplete(L, status)) break; /* cannot try to add lines? */
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290 if (!pushline(L, 0)) /* no more input? */
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291 return -1;
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292 lua_pushliteral(L, "\n"); /* add a new line... */
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293 lua_insert(L, -2); /* ...between the two lines */
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294 lua_concat(L, 3); /* join them */
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295 }
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296 lua_saveline(L, 1);
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297 lua_remove(L, 1); /* remove line */
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298 return status;
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299 }
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300
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301
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302 static void dotty (lua_State *L) {
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303 int status;
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304 const char *oldprogname = progname;
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305 progname = NULL;
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306 while ((status = loadline(L)) != -1) {
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307 if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
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308 report(L, status);
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309 if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
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310 luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
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311 lua_getglobal(L, "print");
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312 lua_insert(L, 1);
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313 if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK)
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314 l_message(progname, lua_pushfstring(L,
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315 "error calling " LUA_QL("print") " (%s)",
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316 lua_tostring(L, -1)));
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317 }
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318 }
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319 lua_settop(L, 0); /* clear stack */
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320 luai_writeline();
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321 progname = oldprogname;
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322 }
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323
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324
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325 static int handle_script (lua_State *L, char **argv, int n) {
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326 int status;
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327 const char *fname;
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328 int narg = getargs(L, argv, n); /* collect arguments */
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329 lua_setglobal(L, "arg");
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330 fname = argv[n];
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331 if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
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332 fname = NULL; /* stdin */
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333 status = luaL_loadfile(L, fname);
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334 lua_insert(L, -(narg+1));
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335 if (status == LUA_OK)
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336 status = docall(L, narg, LUA_MULTRET);
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337 else
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338 lua_pop(L, narg);
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339 return report(L, status);
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340 }
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341
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342
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343 /* check that argument has no extra characters at the end */
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344 #define noextrachars(x) {if ((x)[2] != '\0') return -1;}
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345
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346
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347 /* indices of various argument indicators in array args */
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348 #define has_i 0 /* -i */
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349 #define has_v 1 /* -v */
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350 #define has_e 2 /* -e */
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351 #define has_E 3 /* -E */
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352
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353 #define num_has 4 /* number of 'has_*' */
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354
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355
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356 static int collectargs (char **argv, int *args) {
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357 int i;
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358 for (i = 1; argv[i] != NULL; i++) {
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359 if (argv[i][0] != '-') /* not an option? */
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360 return i;
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361 switch (argv[i][1]) { /* option */
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362 case '-':
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363 noextrachars(argv[i]);
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364 return (argv[i+1] != NULL ? i+1 : 0);
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365 case '\0':
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366 return i;
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367 case 'E':
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368 args[has_E] = 1;
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369 break;
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370 case 'i':
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371 noextrachars(argv[i]);
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372 args[has_i] = 1; /* go through */
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373 case 'v':
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374 noextrachars(argv[i]);
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375 args[has_v] = 1;
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376 break;
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377 case 'e':
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378 args[has_e] = 1; /* go through */
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379 case 'l': /* both options need an argument */
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380 if (argv[i][2] == '\0') { /* no concatenated argument? */
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381 i++; /* try next 'argv' */
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382 if (argv[i] == NULL || argv[i][0] == '-')
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383 return -(i - 1); /* no next argument or it is another option */
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384 }
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385 break;
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386 default: /* invalid option; return its index... */
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387 return -i; /* ...as a negative value */
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388 }
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389 }
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390 return 0;
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391 }
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392
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393
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394 static int runargs (lua_State *L, char **argv, int n) {
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395 int i;
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396 for (i = 1; i < n; i++) {
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397 lua_assert(argv[i][0] == '-');
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398 switch (argv[i][1]) { /* option */
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399 case 'e': {
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400 const char *chunk = argv[i] + 2;
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401 if (*chunk == '\0') chunk = argv[++i];
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402 lua_assert(chunk != NULL);
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403 if (dostring(L, chunk, "=(command line)") != LUA_OK)
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404 return 0;
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405 break;
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406 }
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407 case 'l': {
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408 const char *filename = argv[i] + 2;
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409 if (*filename == '\0') filename = argv[++i];
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410 lua_assert(filename != NULL);
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411 if (dolibrary(L, filename) != LUA_OK)
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412 return 0; /* stop if file fails */
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413 break;
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414 }
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415 default: break;
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416 }
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417 }
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418 return 1;
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419 }
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420
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421
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422 static int handle_luainit (lua_State *L) {
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423 const char *name = "=" LUA_INITVERSION;
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424 const char *init = getenv(name + 1);
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425 if (init == NULL) {
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426 name = "=" LUA_INIT;
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427 init = getenv(name + 1); /* try alternative name */
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428 }
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429 if (init == NULL) return LUA_OK;
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430 else if (init[0] == '@')
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431 return dofile(L, init+1);
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432 else
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433 return dostring(L, init, name);
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434 }
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435
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436
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437 static int pmain (lua_State *L) {
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438 int argc = (int)lua_tointeger(L, 1);
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439 char **argv = (char **)lua_touserdata(L, 2);
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440 int script;
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441 int args[num_has];
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442 args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0;
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443 if (argv[0] && argv[0][0]) progname = argv[0];
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444 script = collectargs(argv, args);
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445 if (script < 0) { /* invalid arg? */
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446 print_usage(argv[-script]);
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447 return 0;
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|
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448 }
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|
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449 if (args[has_v]) print_version();
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|
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450 if (args[has_E]) { /* option '-E'? */
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451 lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
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452 lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
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|
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453 }
|
|
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454 /* open standard libraries */
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455 luaL_checkversion(L);
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456 lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
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|
|
457 luaL_openlibs(L); /* open libraries */
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|
458 lua_gc(L, LUA_GCRESTART, 0);
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|
|
459 if (!args[has_E] && handle_luainit(L) != LUA_OK)
|
|
|
460 return 0; /* error running LUA_INIT */
|
|
|
461 /* execute arguments -e and -l */
|
|
|
462 if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
|
|
|
463 /* execute main script (if there is one) */
|
|
|
464 if (script && handle_script(L, argv, script) != LUA_OK) return 0;
|
|
|
465 if (args[has_i]) /* -i option? */
|
|
|
466 dotty(L);
|
|
|
467 else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */
|
|
|
468 if (lua_stdin_is_tty()) {
|
|
|
469 print_version();
|
|
|
470 dotty(L);
|
|
|
471 }
|
|
|
472 else dofile(L, NULL); /* executes stdin as a file */
|
|
|
473 }
|
|
|
474 lua_pushboolean(L, 1); /* signal no errors */
|
|
|
475 return 1;
|
|
|
476 }
|
|
|
477
|
|
|
478
|
|
|
479 int main (int argc, char **argv) {
|
|
|
480 int status, result;
|
|
|
481 lua_State *L = luaL_newstate(); /* create state */
|
|
|
482 if (L == NULL) {
|
|
|
483 l_message(argv[0], "cannot create state: not enough memory");
|
|
|
484 return EXIT_FAILURE;
|
|
|
485 }
|
|
|
486 /* call 'pmain' in protected mode */
|
|
|
487 lua_pushcfunction(L, &pmain);
|
|
|
488 lua_pushinteger(L, argc); /* 1st argument */
|
|
|
489 lua_pushlightuserdata(L, argv); /* 2nd argument */
|
|
|
490 status = lua_pcall(L, 2, 1, 0);
|
|
|
491 result = lua_toboolean(L, -1); /* get result */
|
|
|
492 finalreport(L, status);
|
|
|
493 lua_close(L);
|
|
|
494 return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
|
|
|
495 }
|
|
|
496
|
