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1866
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1 /*
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2 ** $Id: liolib.c,v 2.111 2013/03/21 13:57:27 roberto Exp $
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3 ** Standard I/O (and system) 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 ** POSIX idiosyncrasy!
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10 ** This definition must come before the inclusion of 'stdio.h'; it
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11 ** should not affect non-POSIX systems
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12 */
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13 #if !defined(_FILE_OFFSET_BITS)
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14 #define _FILE_OFFSET_BITS 64
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15 #endif
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16
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17
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18 #include <errno.h>
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19 #include <stdio.h>
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20 #include <stdlib.h>
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21 #include <string.h>
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22
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23 #define liolib_c
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24 #define LUA_LIB
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25
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26 #include "lua.h"
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27
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28 #include "lauxlib.h"
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29 #include "lualib.h"
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30
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31
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32 #if !defined(lua_checkmode)
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33
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34 /*
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35 ** Check whether 'mode' matches '[rwa]%+?b?'.
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36 ** Change this macro to accept other modes for 'fopen' besides
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37 ** the standard ones.
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38 */
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39 #define lua_checkmode(mode) \
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40 (*mode != '\0' && strchr("rwa", *(mode++)) != NULL && \
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41 (*mode != '+' || ++mode) && /* skip if char is '+' */ \
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42 (*mode != 'b' || ++mode) && /* skip if char is 'b' */ \
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43 (*mode == '\0'))
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44
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45 #endif
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46
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47 /*
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48 ** {======================================================
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49 ** lua_popen spawns a new process connected to the current
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50 ** one through the file streams.
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51 ** =======================================================
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52 */
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53
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54 #if !defined(lua_popen) /* { */
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55
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56 #if defined(LUA_USE_POPEN) /* { */
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57
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58 #define lua_popen(L,c,m) ((void)L, fflush(NULL), popen(c,m))
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59 #define lua_pclose(L,file) ((void)L, pclose(file))
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60
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61 #elif defined(LUA_WIN) /* }{ */
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62
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63 #define lua_popen(L,c,m) ((void)L, _popen(c,m))
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64 #define lua_pclose(L,file) ((void)L, _pclose(file))
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65
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66
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67 #else /* }{ */
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68
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69 #define lua_popen(L,c,m) ((void)((void)c, m), \
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70 luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)
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71 #define lua_pclose(L,file) ((void)((void)L, file), -1)
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72
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73
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74 #endif /* } */
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75
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76 #endif /* } */
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77
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78 /* }====================================================== */
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79
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80
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81 /*
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82 ** {======================================================
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83 ** lua_fseek/lua_ftell: configuration for longer offsets
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84 ** =======================================================
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85 */
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86
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87 #if !defined(lua_fseek) /* { */
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88
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89 #if defined(LUA_USE_POSIX)
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90
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91 #define l_fseek(f,o,w) fseeko(f,o,w)
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92 #define l_ftell(f) ftello(f)
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93 #define l_seeknum off_t
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94
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95 #elif defined(LUA_WIN) && !defined(_CRTIMP_TYPEINFO) \
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96 && defined(_MSC_VER) && (_MSC_VER >= 1400)
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97 /* Windows (but not DDK) and Visual C++ 2005 or higher */
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98
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99 #define l_fseek(f,o,w) _fseeki64(f,o,w)
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100 #define l_ftell(f) _ftelli64(f)
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101 #define l_seeknum __int64
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102
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103 #else
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104
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105 #define l_fseek(f,o,w) fseek(f,o,w)
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106 #define l_ftell(f) ftell(f)
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107 #define l_seeknum long
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108
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109 #endif
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110
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111 #endif /* } */
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112
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113 /* }====================================================== */
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114
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115
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116 #define IO_PREFIX "_IO_"
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117 #define IO_INPUT (IO_PREFIX "input")
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118 #define IO_OUTPUT (IO_PREFIX "output")
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119
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120
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121 typedef luaL_Stream LStream;
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122
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123
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124 #define tolstream(L) ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
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125
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126 #define isclosed(p) ((p)->closef == NULL)
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127
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128
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129 static int io_type (lua_State *L) {
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130 LStream *p;
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131 luaL_checkany(L, 1);
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132 p = (LStream *)luaL_testudata(L, 1, LUA_FILEHANDLE);
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133 if (p == NULL)
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134 lua_pushnil(L); /* not a file */
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135 else if (isclosed(p))
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136 lua_pushliteral(L, "closed file");
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137 else
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138 lua_pushliteral(L, "file");
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139 return 1;
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140 }
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141
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142
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143 static int f_tostring (lua_State *L) {
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144 LStream *p = tolstream(L);
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145 if (isclosed(p))
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146 lua_pushliteral(L, "file (closed)");
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147 else
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148 lua_pushfstring(L, "file (%p)", p->f);
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149 return 1;
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150 }
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151
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152
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153 static FILE *tofile (lua_State *L) {
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154 LStream *p = tolstream(L);
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155 if (isclosed(p))
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156 luaL_error(L, "attempt to use a closed file");
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157 lua_assert(p->f);
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158 return p->f;
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159 }
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160
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161
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162 /*
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163 ** When creating file handles, always creates a `closed' file handle
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164 ** before opening the actual file; so, if there is a memory error, the
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165 ** file is not left opened.
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166 */
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167 static LStream *newprefile (lua_State *L) {
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168 LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
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169 p->closef = NULL; /* mark file handle as 'closed' */
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170 luaL_setmetatable(L, LUA_FILEHANDLE);
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171 return p;
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172 }
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173
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174
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175 static int aux_close (lua_State *L) {
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176 LStream *p = tolstream(L);
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177 lua_CFunction cf = p->closef;
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178 p->closef = NULL; /* mark stream as closed */
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179 return (*cf)(L); /* close it */
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180 }
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181
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182
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183 static int io_close (lua_State *L) {
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184 if (lua_isnone(L, 1)) /* no argument? */
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185 lua_getfield(L, LUA_REGISTRYINDEX, IO_OUTPUT); /* use standard output */
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186 tofile(L); /* make sure argument is an open stream */
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187 return aux_close(L);
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188 }
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189
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190
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191 static int f_gc (lua_State *L) {
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192 LStream *p = tolstream(L);
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193 if (!isclosed(p) && p->f != NULL)
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194 aux_close(L); /* ignore closed and incompletely open files */
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195 return 0;
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196 }
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197
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198
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199 /*
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200 ** function to close regular files
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201 */
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202 static int io_fclose (lua_State *L) {
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203 LStream *p = tolstream(L);
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204 int res = fclose(p->f);
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205 return luaL_fileresult(L, (res == 0), NULL);
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206 }
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207
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208
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209 static LStream *newfile (lua_State *L) {
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210 LStream *p = newprefile(L);
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211 p->f = NULL;
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212 p->closef = &io_fclose;
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213 return p;
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214 }
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215
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216
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217 static void opencheck (lua_State *L, const char *fname, const char *mode) {
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218 LStream *p = newfile(L);
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219 p->f = fopen(fname, mode);
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220 if (p->f == NULL)
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221 luaL_error(L, "cannot open file " LUA_QS " (%s)", fname, strerror(errno));
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222 }
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223
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224
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225 static int io_open (lua_State *L) {
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226 const char *filename = luaL_checkstring(L, 1);
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227 const char *mode = luaL_optstring(L, 2, "r");
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228 LStream *p = newfile(L);
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229 const char *md = mode; /* to traverse/check mode */
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230 luaL_argcheck(L, lua_checkmode(md), 2, "invalid mode");
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231 p->f = fopen(filename, mode);
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232 return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
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233 }
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234
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235
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236 /*
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237 ** function to close 'popen' files
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238 */
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239 static int io_pclose (lua_State *L) {
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240 LStream *p = tolstream(L);
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241 return luaL_execresult(L, lua_pclose(L, p->f));
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242 }
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243
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244
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245 static int io_popen (lua_State *L) {
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246 const char *filename = luaL_checkstring(L, 1);
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247 const char *mode = luaL_optstring(L, 2, "r");
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248 LStream *p = newprefile(L);
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249 p->f = lua_popen(L, filename, mode);
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250 p->closef = &io_pclose;
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251 return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
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252 }
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253
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254
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255 static int io_tmpfile (lua_State *L) {
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256 LStream *p = newfile(L);
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257 p->f = tmpfile();
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258 return (p->f == NULL) ? luaL_fileresult(L, 0, NULL) : 1;
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259 }
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260
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261
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262 static FILE *getiofile (lua_State *L, const char *findex) {
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263 LStream *p;
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264 lua_getfield(L, LUA_REGISTRYINDEX, findex);
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265 p = (LStream *)lua_touserdata(L, -1);
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266 if (isclosed(p))
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267 luaL_error(L, "standard %s file is closed", findex + strlen(IO_PREFIX));
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268 return p->f;
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269 }
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270
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271
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272 static int g_iofile (lua_State *L, const char *f, const char *mode) {
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273 if (!lua_isnoneornil(L, 1)) {
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274 const char *filename = lua_tostring(L, 1);
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275 if (filename)
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276 opencheck(L, filename, mode);
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277 else {
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278 tofile(L); /* check that it's a valid file handle */
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279 lua_pushvalue(L, 1);
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280 }
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281 lua_setfield(L, LUA_REGISTRYINDEX, f);
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282 }
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283 /* return current value */
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284 lua_getfield(L, LUA_REGISTRYINDEX, f);
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285 return 1;
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286 }
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287
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288
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289 static int io_input (lua_State *L) {
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290 return g_iofile(L, IO_INPUT, "r");
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291 }
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292
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293
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294 static int io_output (lua_State *L) {
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295 return g_iofile(L, IO_OUTPUT, "w");
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296 }
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297
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298
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299 static int io_readline (lua_State *L);
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300
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301
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302 static void aux_lines (lua_State *L, int toclose) {
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303 int i;
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304 int n = lua_gettop(L) - 1; /* number of arguments to read */
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305 /* ensure that arguments will fit here and into 'io_readline' stack */
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306 luaL_argcheck(L, n <= LUA_MINSTACK - 3, LUA_MINSTACK - 3, "too many options");
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307 lua_pushvalue(L, 1); /* file handle */
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308 lua_pushinteger(L, n); /* number of arguments to read */
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309 lua_pushboolean(L, toclose); /* close/not close file when finished */
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310 for (i = 1; i <= n; i++) lua_pushvalue(L, i + 1); /* copy arguments */
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311 lua_pushcclosure(L, io_readline, 3 + n);
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312 }
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313
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314
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315 static int f_lines (lua_State *L) {
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316 tofile(L); /* check that it's a valid file handle */
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317 aux_lines(L, 0);
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318 return 1;
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319 }
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320
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321
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322 static int io_lines (lua_State *L) {
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323 int toclose;
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324 if (lua_isnone(L, 1)) lua_pushnil(L); /* at least one argument */
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325 if (lua_isnil(L, 1)) { /* no file name? */
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326 lua_getfield(L, LUA_REGISTRYINDEX, IO_INPUT); /* get default input */
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327 lua_replace(L, 1); /* put it at index 1 */
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328 tofile(L); /* check that it's a valid file handle */
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329 toclose = 0; /* do not close it after iteration */
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330 }
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331 else { /* open a new file */
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332 const char *filename = luaL_checkstring(L, 1);
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333 opencheck(L, filename, "r");
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334 lua_replace(L, 1); /* put file at index 1 */
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335 toclose = 1; /* close it after iteration */
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336 }
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337 aux_lines(L, toclose);
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338 return 1;
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339 }
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340
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341
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342 /*
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343 ** {======================================================
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344 ** READ
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345 ** =======================================================
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346 */
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347
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348
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349 static int read_number (lua_State *L, FILE *f) {
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350 lua_Number d;
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351 if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
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352 lua_pushnumber(L, d);
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353 return 1;
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354 }
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355 else {
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356 lua_pushnil(L); /* "result" to be removed */
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357 return 0; /* read fails */
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358 }
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359 }
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360
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361
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362 static int test_eof (lua_State *L, FILE *f) {
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363 int c = getc(f);
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364 ungetc(c, f);
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365 lua_pushlstring(L, NULL, 0);
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366 return (c != EOF);
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367 }
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368
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369
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370 static int read_line (lua_State *L, FILE *f, int chop) {
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371 luaL_Buffer b;
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372 luaL_buffinit(L, &b);
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373 for (;;) {
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374 size_t l;
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375 char *p = luaL_prepbuffer(&b);
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376 if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
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377 luaL_pushresult(&b); /* close buffer */
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378 return (lua_rawlen(L, -1) > 0); /* check whether read something */
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379 }
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380 l = strlen(p);
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381 if (l == 0 || p[l-1] != '\n')
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382 luaL_addsize(&b, l);
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383 else {
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384 luaL_addsize(&b, l - chop); /* chop 'eol' if needed */
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385 luaL_pushresult(&b); /* close buffer */
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386 return 1; /* read at least an `eol' */
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387 }
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388 }
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389 }
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390
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391
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392 #define MAX_SIZE_T (~(size_t)0)
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393
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394 static void read_all (lua_State *L, FILE *f) {
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395 size_t rlen = LUAL_BUFFERSIZE; /* how much to read in each cycle */
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396 luaL_Buffer b;
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397 luaL_buffinit(L, &b);
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398 for (;;) {
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399 char *p = luaL_prepbuffsize(&b, rlen);
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400 size_t nr = fread(p, sizeof(char), rlen, f);
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401 luaL_addsize(&b, nr);
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402 if (nr < rlen) break; /* eof? */
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403 else if (rlen <= (MAX_SIZE_T / 4)) /* avoid buffers too large */
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404 rlen *= 2; /* double buffer size at each iteration */
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405 }
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406 luaL_pushresult(&b); /* close buffer */
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407 }
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408
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409
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410 static int read_chars (lua_State *L, FILE *f, size_t n) {
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411 size_t nr; /* number of chars actually read */
|
|
|
412 char *p;
|
|
|
413 luaL_Buffer b;
|
|
|
414 luaL_buffinit(L, &b);
|
|
|
415 p = luaL_prepbuffsize(&b, n); /* prepare buffer to read whole block */
|
|
|
416 nr = fread(p, sizeof(char), n, f); /* try to read 'n' chars */
|
|
|
417 luaL_addsize(&b, nr);
|
|
|
418 luaL_pushresult(&b); /* close buffer */
|
|
|
419 return (nr > 0); /* true iff read something */
|
|
|
420 }
|
|
|
421
|
|
|
422
|
|
|
423 static int g_read (lua_State *L, FILE *f, int first) {
|
|
|
424 int nargs = lua_gettop(L) - 1;
|
|
|
425 int success;
|
|
|
426 int n;
|
|
|
427 clearerr(f);
|
|
|
428 if (nargs == 0) { /* no arguments? */
|
|
|
429 success = read_line(L, f, 1);
|
|
|
430 n = first+1; /* to return 1 result */
|
|
|
431 }
|
|
|
432 else { /* ensure stack space for all results and for auxlib's buffer */
|
|
|
433 luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
|
|
|
434 success = 1;
|
|
|
435 for (n = first; nargs-- && success; n++) {
|
|
|
436 if (lua_type(L, n) == LUA_TNUMBER) {
|
|
|
437 size_t l = (size_t)lua_tointeger(L, n);
|
|
|
438 success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
|
|
|
439 }
|
|
|
440 else {
|
|
|
441 const char *p = lua_tostring(L, n);
|
|
|
442 luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
|
|
|
443 switch (p[1]) {
|
|
|
444 case 'n': /* number */
|
|
|
445 success = read_number(L, f);
|
|
|
446 break;
|
|
|
447 case 'l': /* line */
|
|
|
448 success = read_line(L, f, 1);
|
|
|
449 break;
|
|
|
450 case 'L': /* line with end-of-line */
|
|
|
451 success = read_line(L, f, 0);
|
|
|
452 break;
|
|
|
453 case 'a': /* file */
|
|
|
454 read_all(L, f); /* read entire file */
|
|
|
455 success = 1; /* always success */
|
|
|
456 break;
|
|
|
457 default:
|
|
|
458 return luaL_argerror(L, n, "invalid format");
|
|
|
459 }
|
|
|
460 }
|
|
|
461 }
|
|
|
462 }
|
|
|
463 if (ferror(f))
|
|
|
464 return luaL_fileresult(L, 0, NULL);
|
|
|
465 if (!success) {
|
|
|
466 lua_pop(L, 1); /* remove last result */
|
|
|
467 lua_pushnil(L); /* push nil instead */
|
|
|
468 }
|
|
|
469 return n - first;
|
|
|
470 }
|
|
|
471
|
|
|
472
|
|
|
473 static int io_read (lua_State *L) {
|
|
|
474 return g_read(L, getiofile(L, IO_INPUT), 1);
|
|
|
475 }
|
|
|
476
|
|
|
477
|
|
|
478 static int f_read (lua_State *L) {
|
|
|
479 return g_read(L, tofile(L), 2);
|
|
|
480 }
|
|
|
481
|
|
|
482
|
|
|
483 static int io_readline (lua_State *L) {
|
|
|
484 LStream *p = (LStream *)lua_touserdata(L, lua_upvalueindex(1));
|
|
|
485 int i;
|
|
|
486 int n = (int)lua_tointeger(L, lua_upvalueindex(2));
|
|
|
487 if (isclosed(p)) /* file is already closed? */
|
|
|
488 return luaL_error(L, "file is already closed");
|
|
|
489 lua_settop(L , 1);
|
|
|
490 for (i = 1; i <= n; i++) /* push arguments to 'g_read' */
|
|
|
491 lua_pushvalue(L, lua_upvalueindex(3 + i));
|
|
|
492 n = g_read(L, p->f, 2); /* 'n' is number of results */
|
|
|
493 lua_assert(n > 0); /* should return at least a nil */
|
|
|
494 if (!lua_isnil(L, -n)) /* read at least one value? */
|
|
|
495 return n; /* return them */
|
|
|
496 else { /* first result is nil: EOF or error */
|
|
|
497 if (n > 1) { /* is there error information? */
|
|
|
498 /* 2nd result is error message */
|
|
|
499 return luaL_error(L, "%s", lua_tostring(L, -n + 1));
|
|
|
500 }
|
|
|
501 if (lua_toboolean(L, lua_upvalueindex(3))) { /* generator created file? */
|
|
|
502 lua_settop(L, 0);
|
|
|
503 lua_pushvalue(L, lua_upvalueindex(1));
|
|
|
504 aux_close(L); /* close it */
|
|
|
505 }
|
|
|
506 return 0;
|
|
|
507 }
|
|
|
508 }
|
|
|
509
|
|
|
510 /* }====================================================== */
|
|
|
511
|
|
|
512
|
|
|
513 static int g_write (lua_State *L, FILE *f, int arg) {
|
|
|
514 int nargs = lua_gettop(L) - arg;
|
|
|
515 int status = 1;
|
|
|
516 for (; nargs--; arg++) {
|
|
|
517 if (lua_type(L, arg) == LUA_TNUMBER) {
|
|
|
518 /* optimization: could be done exactly as for strings */
|
|
|
519 status = status &&
|
|
|
520 fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
|
|
|
521 }
|
|
|
522 else {
|
|
|
523 size_t l;
|
|
|
524 const char *s = luaL_checklstring(L, arg, &l);
|
|
|
525 status = status && (fwrite(s, sizeof(char), l, f) == l);
|
|
|
526 }
|
|
|
527 }
|
|
|
528 if (status) return 1; /* file handle already on stack top */
|
|
|
529 else return luaL_fileresult(L, status, NULL);
|
|
|
530 }
|
|
|
531
|
|
|
532
|
|
|
533 static int io_write (lua_State *L) {
|
|
|
534 return g_write(L, getiofile(L, IO_OUTPUT), 1);
|
|
|
535 }
|
|
|
536
|
|
|
537
|
|
|
538 static int f_write (lua_State *L) {
|
|
|
539 FILE *f = tofile(L);
|
|
|
540 lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
|
|
|
541 return g_write(L, f, 2);
|
|
|
542 }
|
|
|
543
|
|
|
544
|
|
|
545 static int f_seek (lua_State *L) {
|
|
|
546 static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
|
|
|
547 static const char *const modenames[] = {"set", "cur", "end", NULL};
|
|
|
548 FILE *f = tofile(L);
|
|
|
549 int op = luaL_checkoption(L, 2, "cur", modenames);
|
|
|
550 lua_Number p3 = luaL_optnumber(L, 3, 0);
|
|
|
551 l_seeknum offset = (l_seeknum)p3;
|
|
|
552 luaL_argcheck(L, (lua_Number)offset == p3, 3,
|
|
|
553 "not an integer in proper range");
|
|
|
554 op = l_fseek(f, offset, mode[op]);
|
|
|
555 if (op)
|
|
|
556 return luaL_fileresult(L, 0, NULL); /* error */
|
|
|
557 else {
|
|
|
558 lua_pushnumber(L, (lua_Number)l_ftell(f));
|
|
|
559 return 1;
|
|
|
560 }
|
|
|
561 }
|
|
|
562
|
|
|
563
|
|
|
564 static int f_setvbuf (lua_State *L) {
|
|
|
565 static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
|
|
|
566 static const char *const modenames[] = {"no", "full", "line", NULL};
|
|
|
567 FILE *f = tofile(L);
|
|
|
568 int op = luaL_checkoption(L, 2, NULL, modenames);
|
|
|
569 lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
|
|
|
570 int res = setvbuf(f, NULL, mode[op], sz);
|
|
|
571 return luaL_fileresult(L, res == 0, NULL);
|
|
|
572 }
|
|
|
573
|
|
|
574
|
|
|
575
|
|
|
576 static int io_flush (lua_State *L) {
|
|
|
577 return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
|
|
|
578 }
|
|
|
579
|
|
|
580
|
|
|
581 static int f_flush (lua_State *L) {
|
|
|
582 return luaL_fileresult(L, fflush(tofile(L)) == 0, NULL);
|
|
|
583 }
|
|
|
584
|
|
|
585
|
|
|
586 /*
|
|
|
587 ** functions for 'io' library
|
|
|
588 */
|
|
|
589 static const luaL_Reg iolib[] = {
|
|
|
590 {"close", io_close},
|
|
|
591 {"flush", io_flush},
|
|
|
592 {"input", io_input},
|
|
|
593 {"lines", io_lines},
|
|
|
594 {"open", io_open},
|
|
|
595 {"output", io_output},
|
|
|
596 {"popen", io_popen},
|
|
|
597 {"read", io_read},
|
|
|
598 {"tmpfile", io_tmpfile},
|
|
|
599 {"type", io_type},
|
|
|
600 {"write", io_write},
|
|
|
601 {NULL, NULL}
|
|
|
602 };
|
|
|
603
|
|
|
604
|
|
|
605 /*
|
|
|
606 ** methods for file handles
|
|
|
607 */
|
|
|
608 static const luaL_Reg flib[] = {
|
|
|
609 {"close", io_close},
|
|
|
610 {"flush", f_flush},
|
|
|
611 {"lines", f_lines},
|
|
|
612 {"read", f_read},
|
|
|
613 {"seek", f_seek},
|
|
|
614 {"setvbuf", f_setvbuf},
|
|
|
615 {"write", f_write},
|
|
|
616 {"__gc", f_gc},
|
|
|
617 {"__tostring", f_tostring},
|
|
|
618 {NULL, NULL}
|
|
|
619 };
|
|
|
620
|
|
|
621
|
|
|
622 static void createmeta (lua_State *L) {
|
|
|
623 luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
|
|
|
624 lua_pushvalue(L, -1); /* push metatable */
|
|
|
625 lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
|
|
|
626 luaL_setfuncs(L, flib, 0); /* add file methods to new metatable */
|
|
|
627 lua_pop(L, 1); /* pop new metatable */
|
|
|
628 }
|
|
|
629
|
|
|
630
|
|
|
631 /*
|
|
|
632 ** function to (not) close the standard files stdin, stdout, and stderr
|
|
|
633 */
|
|
|
634 static int io_noclose (lua_State *L) {
|
|
|
635 LStream *p = tolstream(L);
|
|
|
636 p->closef = &io_noclose; /* keep file opened */
|
|
|
637 lua_pushnil(L);
|
|
|
638 lua_pushliteral(L, "cannot close standard file");
|
|
|
639 return 2;
|
|
|
640 }
|
|
|
641
|
|
|
642
|
|
|
643 static void createstdfile (lua_State *L, FILE *f, const char *k,
|
|
|
644 const char *fname) {
|
|
|
645 LStream *p = newprefile(L);
|
|
|
646 p->f = f;
|
|
|
647 p->closef = &io_noclose;
|
|
|
648 if (k != NULL) {
|
|
|
649 lua_pushvalue(L, -1);
|
|
|
650 lua_setfield(L, LUA_REGISTRYINDEX, k); /* add file to registry */
|
|
|
651 }
|
|
|
652 lua_setfield(L, -2, fname); /* add file to module */
|
|
|
653 }
|
|
|
654
|
|
|
655
|
|
|
656 LUAMOD_API int luaopen_io (lua_State *L) {
|
|
|
657 luaL_newlib(L, iolib); /* new module */
|
|
|
658 createmeta(L);
|
|
|
659 /* create (and set) default files */
|
|
|
660 createstdfile(L, stdin, IO_INPUT, "stdin");
|
|
|
661 createstdfile(L, stdout, IO_OUTPUT, "stdout");
|
|
|
662 createstdfile(L, stderr, NULL, "stderr");
|
|
|
663 return 1;
|
|
|
664 }
|
|
|
665
|
