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Rev | Author | Line No. | Line |
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5205 | clevermous | 1 | /* |
2 | ** $Id: lua.c,v 1.203 2011/12/12 16:34:03 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 | |||
7 | |||
8 | #include |
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9 | #include |
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10 | #include |
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11 | #include |
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12 | |||
13 | #define lua_c |
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14 | |||
15 | #include "lua.h" |
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16 | |||
17 | #include "lauxlib.h" |
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18 | #include "lualib.h" |
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19 | |||
20 | |||
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 | |||
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 | |||
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 | |||
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 | |||
38 | #define LUA_INITVERSION \ |
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39 | LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR |
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40 | |||
41 | |||
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 |
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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 |
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51 | #include |
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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 | |||
57 | |||
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 | |||
66 | #include |
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67 | #include |
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68 | #include |
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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 | |||
75 | #elif !defined(lua_readline) |
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76 | |||
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 | |||
83 | #endif |
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84 | |||
85 | |||
86 | |||
87 | |||
88 | static lua_State *globalL = NULL; |
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89 | |||
90 | static const char *progname = LUA_PROGNAME; |
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91 | |||
92 | |||
93 | |||
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 | |||
100 | |||
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 | |||
107 | |||
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 | |||
128 | |||
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 | |||
134 | |||
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 | |||
147 | |||
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 | |||
159 | |||
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 | |||
171 | |||
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 | |||
185 | |||
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 | |||
191 | |||
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 | |||
209 | |||
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 | |||
216 | |||
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 | |||
223 | |||
224 | static int dolibrary (lua_State *L, const char *name) { |
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225 | int status; |
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226 | lua_pushglobaltable(L); |
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227 | lua_getfield(L, -1, "require"); |
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228 | lua_pushstring(L, name); |
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229 | status = docall(L, 1, 1); |
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230 | if (status == LUA_OK) { |
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231 | lua_setfield(L, -2, name); /* global[name] = require return */ |
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232 | lua_pop(L, 1); /* remove global table */ |
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233 | } |
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234 | else |
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235 | lua_remove(L, -2); /* remove global table (below error msg.) */ |
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236 | return report(L, status); |
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237 | } |
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238 | |||
239 | |||
240 | static const char *get_prompt (lua_State *L, int firstline) { |
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241 | const char *p; |
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242 | lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2"); |
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243 | p = lua_tostring(L, -1); |
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244 | if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2); |
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245 | lua_pop(L, 1); /* remove global */ |
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246 | return p; |
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247 | } |
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248 | |||
249 | /* mark in error messages for incomplete statements */ |
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250 | #define EOFMARK " |
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251 | #define marklen (sizeof(EOFMARK)/sizeof(char) - 1) |
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252 | |||
253 | static int incomplete (lua_State *L, int status) { |
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254 | if (status == LUA_ERRSYNTAX) { |
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255 | size_t lmsg; |
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256 | const char *msg = lua_tolstring(L, -1, &lmsg); |
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257 | if (lmsg >= marklen && strcmp(msg + lmsg - marklen, EOFMARK) == 0) { |
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258 | lua_pop(L, 1); |
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259 | return 1; |
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260 | } |
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261 | } |
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262 | return 0; /* else... */ |
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263 | } |
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264 | |||
265 | |||
266 | static int pushline (lua_State *L, int firstline) { |
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267 | char buffer[LUA_MAXINPUT]; |
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268 | char *b = buffer; |
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269 | size_t l; |
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270 | const char *prmt = get_prompt(L, firstline); |
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271 | if (lua_readline(L, b, prmt) == 0) |
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272 | return 0; /* no input */ |
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273 | l = strlen(b); |
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274 | if (l > 0 && b[l-1] == '\n') /* line ends with newline? */ |
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275 | b[l-1] = '\0'; /* remove it */ |
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276 | if (firstline && b[0] == '=') /* first line starts with `=' ? */ |
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277 | lua_pushfstring(L, "return %s", b+1); /* change it to `return' */ |
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278 | else |
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279 | lua_pushstring(L, b); |
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280 | lua_freeline(L, b); |
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281 | return 1; |
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282 | } |
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283 | |||
284 | |||
285 | static int loadline (lua_State *L) { |
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286 | int status; |
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287 | lua_settop(L, 0); |
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288 | if (!pushline(L, 1)) |
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289 | return -1; /* no input */ |
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290 | for (;;) { /* repeat until gets a complete line */ |
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291 | size_t l; |
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292 | const char *line = lua_tolstring(L, 1, &l); |
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293 | status = luaL_loadbuffer(L, line, l, "=stdin"); |
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294 | if (!incomplete(L, status)) break; /* cannot try to add lines? */ |
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295 | if (!pushline(L, 0)) /* no more input? */ |
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296 | return -1; |
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297 | lua_pushliteral(L, "\n"); /* add a new line... */ |
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298 | lua_insert(L, -2); /* ...between the two lines */ |
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299 | lua_concat(L, 3); /* join them */ |
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300 | } |
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301 | lua_saveline(L, 1); |
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302 | lua_remove(L, 1); /* remove line */ |
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303 | return status; |
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304 | } |
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305 | |||
306 | |||
307 | static void dotty (lua_State *L) { |
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308 | int status; |
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309 | const char *oldprogname = progname; |
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310 | progname = NULL; |
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311 | while ((status = loadline(L)) != -1) { |
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312 | if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET); |
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313 | report(L, status); |
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314 | if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */ |
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315 | luaL_checkstack(L, LUA_MINSTACK, "too many results to print"); |
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316 | lua_getglobal(L, "print"); |
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317 | lua_insert(L, 1); |
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318 | if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK) |
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319 | l_message(progname, lua_pushfstring(L, |
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320 | "error calling " LUA_QL("print") " (%s)", |
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321 | lua_tostring(L, -1))); |
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322 | } |
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323 | } |
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324 | lua_settop(L, 0); /* clear stack */ |
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325 | luai_writeline(); |
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326 | progname = oldprogname; |
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327 | } |
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328 | |||
329 | |||
330 | static int handle_script (lua_State *L, char **argv, int n) { |
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331 | int status; |
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332 | const char *fname; |
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333 | int narg = getargs(L, argv, n); /* collect arguments */ |
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334 | lua_setglobal(L, "arg"); |
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335 | fname = argv[n]; |
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336 | if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0) |
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337 | fname = NULL; /* stdin */ |
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338 | status = luaL_loadfile(L, fname); |
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339 | lua_insert(L, -(narg+1)); |
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340 | if (status == LUA_OK) |
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341 | status = docall(L, narg, LUA_MULTRET); |
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342 | else |
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343 | lua_pop(L, narg); |
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344 | return report(L, status); |
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345 | } |
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346 | |||
347 | |||
348 | /* check that argument has no extra characters at the end */ |
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349 | #define noextrachars(x) {if ((x)[2] != '\0') return -1;} |
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350 | |||
351 | |||
352 | /* indices of various argument indicators in array args */ |
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353 | #define has_i 0 /* -i */ |
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354 | #define has_v 1 /* -v */ |
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355 | #define has_e 2 /* -e */ |
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356 | #define has_E 3 /* -E */ |
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357 | |||
358 | #define num_has 4 /* number of 'has_*' */ |
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359 | |||
360 | |||
361 | static int collectargs (char **argv, int *args) { |
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362 | int i; |
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363 | for (i = 1; argv[i] != NULL; i++) { |
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364 | if (argv[i][0] != '-') /* not an option? */ |
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365 | return i; |
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366 | switch (argv[i][1]) { /* option */ |
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367 | case '-': |
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368 | noextrachars(argv[i]); |
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369 | return (argv[i+1] != NULL ? i+1 : 0); |
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370 | case '\0': |
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371 | return i; |
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372 | case 'E': |
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373 | args[has_E] = 1; |
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374 | break; |
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375 | case 'i': |
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376 | noextrachars(argv[i]); |
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377 | args[has_i] = 1; /* go through */ |
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378 | case 'v': |
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379 | noextrachars(argv[i]); |
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380 | args[has_v] = 1; |
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381 | break; |
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382 | case 'e': |
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383 | args[has_e] = 1; /* go through */ |
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384 | case 'l': /* both options need an argument */ |
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385 | if (argv[i][2] == '\0') { /* no concatenated argument? */ |
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386 | i++; /* try next 'argv' */ |
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387 | if (argv[i] == NULL || argv[i][0] == '-') |
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388 | return -(i - 1); /* no next argument or it is another option */ |
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389 | } |
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390 | break; |
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391 | default: /* invalid option; return its index... */ |
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392 | return -i; /* ...as a negative value */ |
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393 | } |
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394 | } |
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395 | return 0; |
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396 | } |
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397 | |||
398 | |||
399 | static int runargs (lua_State *L, char **argv, int n) { |
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400 | int i; |
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401 | for (i = 1; i < n; i++) { |
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402 | lua_assert(argv[i][0] == '-'); |
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403 | switch (argv[i][1]) { /* option */ |
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404 | case 'e': { |
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405 | const char *chunk = argv[i] + 2; |
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406 | if (*chunk == '\0') chunk = argv[++i]; |
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407 | lua_assert(chunk != NULL); |
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408 | if (dostring(L, chunk, "=(command line)") != LUA_OK) |
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409 | return 0; |
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410 | break; |
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411 | } |
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412 | case 'l': { |
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413 | const char *filename = argv[i] + 2; |
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414 | if (*filename == '\0') filename = argv[++i]; |
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415 | lua_assert(filename != NULL); |
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416 | if (dolibrary(L, filename) != LUA_OK) |
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417 | return 0; /* stop if file fails */ |
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418 | break; |
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419 | } |
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420 | default: break; |
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421 | } |
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422 | } |
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423 | return 1; |
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424 | } |
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425 | |||
426 | |||
427 | static int handle_luainit (lua_State *L) { |
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428 | const char *name = "=" LUA_INITVERSION; |
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429 | const char *init = getenv(name + 1); |
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430 | if (init == NULL) { |
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431 | name = "=" LUA_INIT; |
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432 | init = getenv(name + 1); /* try alternative name */ |
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433 | } |
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434 | if (init == NULL) return LUA_OK; |
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435 | else if (init[0] == '@') |
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436 | return dofile(L, init+1); |
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437 | else |
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438 | return dostring(L, init, name); |
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439 | } |
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440 | |||
441 | |||
442 | static int pmain (lua_State *L) { |
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443 | int argc = (int)lua_tointeger(L, 1); |
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444 | char **argv = (char **)lua_touserdata(L, 2); |
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445 | int script; |
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446 | int args[num_has]; |
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447 | args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0; |
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448 | if (argv[0] && argv[0][0]) progname = argv[0]; |
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449 | script = collectargs(argv, args); |
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450 | if (script < 0) { /* invalid arg? */ |
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451 | print_usage(argv[-script]); |
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452 | return 0; |
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453 | } |
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454 | if (args[has_v]) print_version(); |
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455 | if (args[has_E]) { /* option '-E'? */ |
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456 | lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */ |
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457 | lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV"); |
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458 | } |
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459 | /* open standard libraries */ |
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460 | luaL_checkversion(L); |
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461 | lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */ |
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462 | luaL_openlibs(L); /* open libraries */ |
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463 | lua_gc(L, LUA_GCRESTART, 0); |
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464 | if (!args[has_E] && handle_luainit(L) != LUA_OK) |
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465 | return 0; /* error running LUA_INIT */ |
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466 | /* execute arguments -e and -l */ |
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467 | if (!runargs(L, argv, (script > 0) ? script : argc)) return 0; |
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468 | /* execute main script (if there is one) */ |
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469 | if (script && handle_script(L, argv, script) != LUA_OK) return 0; |
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470 | if (args[has_i]) /* -i option? */ |
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471 | dotty(L); |
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472 | else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */ |
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473 | if (lua_stdin_is_tty()) { |
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474 | print_version(); |
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475 | dotty(L); |
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476 | } |
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477 | else dofile(L, NULL); /* executes stdin as a file */ |
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478 | } |
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479 | lua_pushboolean(L, 1); /* signal no errors */ |
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480 | return 1; |
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481 | } |
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482 | |||
483 | |||
484 | int main (int argc, char **argv) { |
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485 | int status, result; |
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486 | lua_State *L = luaL_newstate(); /* create state */ |
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487 | if (L == NULL) { |
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488 | l_message(argv[0], "cannot create state: not enough memory"); |
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489 | return EXIT_FAILURE; |
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490 | } |
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491 | /* call 'pmain' in protected mode */ |
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492 | lua_pushcfunction(L, &pmain); |
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493 | lua_pushinteger(L, argc); /* 1st argument */ |
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494 | lua_pushlightuserdata(L, argv); /* 2nd argument */ |
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495 | status = lua_pcall(L, 2, 1, 0); |
||
496 | result = lua_toboolean(L, -1); /* get result */ |
||
497 | finalreport(L, status); |
||
498 | lua_close(L); |
||
499 | return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE; |
||
500 | }>>>> |
||
501 |