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1866
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1 /*
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2 ** $Id: lbaselib.c,v 1.276 2013/02/21 13:44:53 roberto Exp $
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3 ** Basic library
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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
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9 #include <ctype.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13
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14 #define lbaselib_c
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15 #define LUA_LIB
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16
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17 #include "lua.h"
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18
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19 #include "lauxlib.h"
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20 #include "lualib.h"
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21
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22
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23 static int luaB_print (lua_State *L) {
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24 int n = lua_gettop(L); /* number of arguments */
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25 int i;
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26 lua_getglobal(L, "tostring");
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27 for (i=1; i<=n; i++) {
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28 const char *s;
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29 size_t l;
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30 lua_pushvalue(L, -1); /* function to be called */
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31 lua_pushvalue(L, i); /* value to print */
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32 lua_call(L, 1, 1);
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33 s = lua_tolstring(L, -1, &l); /* get result */
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34 if (s == NULL)
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35 return luaL_error(L,
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36 LUA_QL("tostring") " must return a string to " LUA_QL("print"));
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37 if (i>1) luai_writestring("\t", 1);
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38 luai_writestring(s, l);
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39 lua_pop(L, 1); /* pop result */
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40 }
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41 luai_writeline();
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42 return 0;
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43 }
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44
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45
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46 #define SPACECHARS " \f\n\r\t\v"
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47
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48 static int luaB_tonumber (lua_State *L) {
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49 if (lua_isnoneornil(L, 2)) { /* standard conversion */
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50 int isnum;
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51 lua_Number n = lua_tonumberx(L, 1, &isnum);
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52 if (isnum) {
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53 lua_pushnumber(L, n);
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54 return 1;
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55 } /* else not a number; must be something */
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56 luaL_checkany(L, 1);
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57 }
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58 else {
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59 size_t l;
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60 const char *s = luaL_checklstring(L, 1, &l);
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61 const char *e = s + l; /* end point for 's' */
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62 int base = luaL_checkint(L, 2);
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63 int neg = 0;
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64 luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
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65 s += strspn(s, SPACECHARS); /* skip initial spaces */
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66 if (*s == '-') { s++; neg = 1; } /* handle signal */
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67 else if (*s == '+') s++;
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68 if (isalnum((unsigned char)*s)) {
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69 lua_Number n = 0;
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70 do {
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71 int digit = (isdigit((unsigned char)*s)) ? *s - '0'
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72 : toupper((unsigned char)*s) - 'A' + 10;
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73 if (digit >= base) break; /* invalid numeral; force a fail */
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74 n = n * (lua_Number)base + (lua_Number)digit;
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75 s++;
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76 } while (isalnum((unsigned char)*s));
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77 s += strspn(s, SPACECHARS); /* skip trailing spaces */
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78 if (s == e) { /* no invalid trailing characters? */
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79 lua_pushnumber(L, (neg) ? -n : n);
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80 return 1;
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81 } /* else not a number */
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82 } /* else not a number */
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83 }
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84 lua_pushnil(L); /* not a number */
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85 return 1;
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86 }
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87
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88
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89 static int luaB_error (lua_State *L) {
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90 int level = luaL_optint(L, 2, 1);
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91 lua_settop(L, 1);
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92 if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
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93 luaL_where(L, level);
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94 lua_pushvalue(L, 1);
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95 lua_concat(L, 2);
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96 }
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97 return lua_error(L);
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98 }
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99
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100
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101 static int luaB_getmetatable (lua_State *L) {
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102 luaL_checkany(L, 1);
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103 if (!lua_getmetatable(L, 1)) {
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104 lua_pushnil(L);
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105 return 1; /* no metatable */
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106 }
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107 luaL_getmetafield(L, 1, "__metatable");
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108 return 1; /* returns either __metatable field (if present) or metatable */
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109 }
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110
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111
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112 static int luaB_setmetatable (lua_State *L) {
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113 int t = lua_type(L, 2);
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114 luaL_checktype(L, 1, LUA_TTABLE);
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115 luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
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116 "nil or table expected");
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117 if (luaL_getmetafield(L, 1, "__metatable"))
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118 return luaL_error(L, "cannot change a protected metatable");
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119 lua_settop(L, 2);
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120 lua_setmetatable(L, 1);
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121 return 1;
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122 }
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123
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124
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125 static int luaB_rawequal (lua_State *L) {
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126 luaL_checkany(L, 1);
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127 luaL_checkany(L, 2);
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128 lua_pushboolean(L, lua_rawequal(L, 1, 2));
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129 return 1;
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130 }
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131
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132
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133 static int luaB_rawlen (lua_State *L) {
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134 int t = lua_type(L, 1);
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135 luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
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136 "table or string expected");
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137 lua_pushinteger(L, lua_rawlen(L, 1));
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138 return 1;
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139 }
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140
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141
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142 static int luaB_rawget (lua_State *L) {
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143 luaL_checktype(L, 1, LUA_TTABLE);
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144 luaL_checkany(L, 2);
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145 lua_settop(L, 2);
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146 lua_rawget(L, 1);
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147 return 1;
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148 }
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149
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150 static int luaB_rawset (lua_State *L) {
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151 luaL_checktype(L, 1, LUA_TTABLE);
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152 luaL_checkany(L, 2);
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153 luaL_checkany(L, 3);
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154 lua_settop(L, 3);
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155 lua_rawset(L, 1);
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156 return 1;
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157 }
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158
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159
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160 static int luaB_collectgarbage (lua_State *L) {
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161 static const char *const opts[] = {"stop", "restart", "collect",
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162 "count", "step", "setpause", "setstepmul",
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163 "setmajorinc", "isrunning", "generational", "incremental", NULL};
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164 static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
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165 LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
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166 LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
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167 int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
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168 int ex = luaL_optint(L, 2, 0);
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169 int res = lua_gc(L, o, ex);
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170 switch (o) {
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171 case LUA_GCCOUNT: {
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172 int b = lua_gc(L, LUA_GCCOUNTB, 0);
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173 lua_pushnumber(L, res + ((lua_Number)b/1024));
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174 lua_pushinteger(L, b);
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175 return 2;
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176 }
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177 case LUA_GCSTEP: case LUA_GCISRUNNING: {
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178 lua_pushboolean(L, res);
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179 return 1;
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180 }
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181 default: {
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182 lua_pushinteger(L, res);
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183 return 1;
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184 }
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185 }
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186 }
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187
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188
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189 static int luaB_type (lua_State *L) {
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190 luaL_checkany(L, 1);
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191 lua_pushstring(L, luaL_typename(L, 1));
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192 return 1;
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193 }
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194
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195
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196 static int pairsmeta (lua_State *L, const char *method, int iszero,
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197 lua_CFunction iter) {
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198 if (!luaL_getmetafield(L, 1, method)) { /* no metamethod? */
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199 luaL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */
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200 lua_pushcfunction(L, iter); /* will return generator, */
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201 lua_pushvalue(L, 1); /* state, */
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202 if (iszero) lua_pushinteger(L, 0); /* and initial value */
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203 else lua_pushnil(L);
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204 }
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205 else {
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206 lua_pushvalue(L, 1); /* argument 'self' to metamethod */
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207 lua_call(L, 1, 3); /* get 3 values from metamethod */
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208 }
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209 return 3;
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210 }
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211
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212
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213 static int luaB_next (lua_State *L) {
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214 luaL_checktype(L, 1, LUA_TTABLE);
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215 lua_settop(L, 2); /* create a 2nd argument if there isn't one */
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216 if (lua_next(L, 1))
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217 return 2;
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218 else {
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219 lua_pushnil(L);
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220 return 1;
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221 }
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222 }
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223
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224
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225 static int luaB_pairs (lua_State *L) {
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226 return pairsmeta(L, "__pairs", 0, luaB_next);
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227 }
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228
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229
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230 static int ipairsaux (lua_State *L) {
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231 int i = luaL_checkint(L, 2);
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232 luaL_checktype(L, 1, LUA_TTABLE);
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233 i++; /* next value */
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234 lua_pushinteger(L, i);
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235 lua_rawgeti(L, 1, i);
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236 return (lua_isnil(L, -1)) ? 1 : 2;
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237 }
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238
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239
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240 static int luaB_ipairs (lua_State *L) {
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241 return pairsmeta(L, "__ipairs", 1, ipairsaux);
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242 }
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243
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244
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245 static int load_aux (lua_State *L, int status, int envidx) {
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246 if (status == LUA_OK) {
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247 if (envidx != 0) { /* 'env' parameter? */
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248 lua_pushvalue(L, envidx); /* environment for loaded function */
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249 if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */
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250 lua_pop(L, 1); /* remove 'env' if not used by previous call */
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251 }
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252 return 1;
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253 }
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254 else { /* error (message is on top of the stack) */
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255 lua_pushnil(L);
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256 lua_insert(L, -2); /* put before error message */
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257 return 2; /* return nil plus error message */
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258 }
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259 }
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260
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261
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262 static int luaB_loadfile (lua_State *L) {
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263 const char *fname = luaL_optstring(L, 1, NULL);
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264 const char *mode = luaL_optstring(L, 2, NULL);
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265 int env = (!lua_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */
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266 int status = luaL_loadfilex(L, fname, mode);
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267 return load_aux(L, status, env);
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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 ** {======================================================
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273 ** Generic Read function
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274 ** =======================================================
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275 */
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276
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277
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278 /*
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279 ** reserved slot, above all arguments, to hold a copy of the returned
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280 ** string to avoid it being collected while parsed. 'load' has four
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281 ** optional arguments (chunk, source name, mode, and environment).
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282 */
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283 #define RESERVEDSLOT 5
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284
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285
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286 /*
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287 ** Reader for generic `load' function: `lua_load' uses the
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288 ** stack for internal stuff, so the reader cannot change the
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289 ** stack top. Instead, it keeps its resulting string in a
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290 ** reserved slot inside the stack.
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291 */
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292 static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
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293 (void)(ud); /* not used */
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294 luaL_checkstack(L, 2, "too many nested functions");
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295 lua_pushvalue(L, 1); /* get function */
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296 lua_call(L, 0, 1); /* call it */
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297 if (lua_isnil(L, -1)) {
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298 lua_pop(L, 1); /* pop result */
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299 *size = 0;
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300 return NULL;
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301 }
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302 else if (!lua_isstring(L, -1))
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303 luaL_error(L, "reader function must return a string");
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304 lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */
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305 return lua_tolstring(L, RESERVEDSLOT, size);
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306 }
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307
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308
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309 static int luaB_load (lua_State *L) {
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310 int status;
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311 size_t l;
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312 const char *s = lua_tolstring(L, 1, &l);
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313 const char *mode = luaL_optstring(L, 3, "bt");
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314 int env = (!lua_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */
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315 if (s != NULL) { /* loading a string? */
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316 const char *chunkname = luaL_optstring(L, 2, s);
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317 status = luaL_loadbufferx(L, s, l, chunkname, mode);
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318 }
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319 else { /* loading from a reader function */
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320 const char *chunkname = luaL_optstring(L, 2, "=(load)");
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321 luaL_checktype(L, 1, LUA_TFUNCTION);
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322 lua_settop(L, RESERVEDSLOT); /* create reserved slot */
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323 status = lua_load(L, generic_reader, NULL, chunkname, mode);
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324 }
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325 return load_aux(L, status, env);
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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
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331 static int dofilecont (lua_State *L) {
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332 return lua_gettop(L) - 1;
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333 }
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334
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335
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336 static int luaB_dofile (lua_State *L) {
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337 const char *fname = luaL_optstring(L, 1, NULL);
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338 lua_settop(L, 1);
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339 if (luaL_loadfile(L, fname) != LUA_OK)
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340 return lua_error(L);
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341 lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
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342 return dofilecont(L);
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343 }
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344
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345
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346 static int luaB_assert (lua_State *L) {
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347 if (!lua_toboolean(L, 1))
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348 return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
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349 return lua_gettop(L);
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350 }
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351
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352
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353 static int luaB_select (lua_State *L) {
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354 int n = lua_gettop(L);
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355 if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
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356 lua_pushinteger(L, n-1);
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357 return 1;
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358 }
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359 else {
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360 int i = luaL_checkint(L, 1);
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361 if (i < 0) i = n + i;
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362 else if (i > n) i = n;
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363 luaL_argcheck(L, 1 <= i, 1, "index out of range");
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364 return n - i;
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365 }
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366 }
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367
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368
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369 static int finishpcall (lua_State *L, int status) {
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370 if (!lua_checkstack(L, 1)) { /* no space for extra boolean? */
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371 lua_settop(L, 0); /* create space for return values */
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372 lua_pushboolean(L, 0);
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373 lua_pushstring(L, "stack overflow");
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374 return 2; /* return false, msg */
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375 }
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376 lua_pushboolean(L, status); /* first result (status) */
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377 lua_replace(L, 1); /* put first result in first slot */
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378 return lua_gettop(L);
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379 }
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380
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381
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382 static int pcallcont (lua_State *L) {
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383 int status = lua_getctx(L, NULL);
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384 return finishpcall(L, (status == LUA_YIELD));
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385 }
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386
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387
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388 static int luaB_pcall (lua_State *L) {
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389 int status;
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390 luaL_checkany(L, 1);
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391 lua_pushnil(L);
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392 lua_insert(L, 1); /* create space for status result */
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393 status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, pcallcont);
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394 return finishpcall(L, (status == LUA_OK));
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395 }
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396
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397
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398 static int luaB_xpcall (lua_State *L) {
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399 int status;
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400 int n = lua_gettop(L);
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401 luaL_argcheck(L, n >= 2, 2, "value expected");
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402 lua_pushvalue(L, 1); /* exchange function... */
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403 lua_copy(L, 2, 1); /* ...and error handler */
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404 lua_replace(L, 2);
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405 status = lua_pcallk(L, n - 2, LUA_MULTRET, 1, 0, pcallcont);
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406 return finishpcall(L, (status == LUA_OK));
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407 }
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408
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409
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410 static int luaB_tostring (lua_State *L) {
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411 luaL_checkany(L, 1);
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412 luaL_tolstring(L, 1, NULL);
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413 return 1;
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414 }
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415
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416
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417 static const luaL_Reg base_funcs[] = {
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418 {"assert", luaB_assert},
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419 {"collectgarbage", luaB_collectgarbage},
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420 {"dofile", luaB_dofile},
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421 {"error", luaB_error},
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422 {"getmetatable", luaB_getmetatable},
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423 {"ipairs", luaB_ipairs},
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424 {"loadfile", luaB_loadfile},
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425 {"load", luaB_load},
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426 #if defined(LUA_COMPAT_LOADSTRING)
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427 {"loadstring", luaB_load},
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|
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428 #endif
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429 {"next", luaB_next},
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430 {"pairs", luaB_pairs},
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|
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431 {"pcall", luaB_pcall},
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|
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432 {"print", luaB_print},
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|
433 {"rawequal", luaB_rawequal},
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|
434 {"rawlen", luaB_rawlen},
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|
|
435 {"rawget", luaB_rawget},
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|
|
436 {"rawset", luaB_rawset},
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|
|
437 {"select", luaB_select},
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|
|
438 {"setmetatable", luaB_setmetatable},
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|
|
439 {"tonumber", luaB_tonumber},
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|
|
440 {"tostring", luaB_tostring},
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|
|
441 {"type", luaB_type},
|
|
|
442 {"xpcall", luaB_xpcall},
|
|
|
443 {NULL, NULL}
|
|
|
444 };
|
|
|
445
|
|
|
446
|
|
|
447 LUAMOD_API int luaopen_base (lua_State *L) {
|
|
|
448 /* set global _G */
|
|
|
449 lua_pushglobaltable(L);
|
|
|
450 lua_pushglobaltable(L);
|
|
|
451 lua_setfield(L, -2, "_G");
|
|
|
452 /* open lib into global table */
|
|
|
453 luaL_setfuncs(L, base_funcs, 0);
|
|
|
454 lua_pushliteral(L, LUA_VERSION);
|
|
|
455 lua_setfield(L, -2, "_VERSION"); /* set global _VERSION */
|
|
|
456 return 1;
|
|
|
457 }
|
|
|
458
|
