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1866
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1 /*
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2 ** $Id: loslib.c,v 1.40 2012/10/19 15:54:02 roberto Exp $
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3 ** Standard Operating 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 #include <errno.h>
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9 #include <locale.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <time.h>
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13
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14 #define loslib_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 /*
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24 ** list of valid conversion specifiers for the 'strftime' function
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25 */
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26 #if !defined(LUA_STRFTIMEOPTIONS)
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27
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28 #if !defined(LUA_USE_POSIX)
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29 #define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" }
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30 #else
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31 #define LUA_STRFTIMEOPTIONS \
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32 { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "" \
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33 "", "E", "cCxXyY", \
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34 "O", "deHImMSuUVwWy" }
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35 #endif
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36
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37 #endif
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38
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39
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40
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41 /*
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42 ** By default, Lua uses tmpnam except when POSIX is available, where it
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43 ** uses mkstemp.
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44 */
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45 #if defined(LUA_USE_MKSTEMP)
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46 #include <unistd.h>
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47 #define LUA_TMPNAMBUFSIZE 32
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48 #define lua_tmpnam(b,e) { \
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49 strcpy(b, "/tmp/lua_XXXXXX"); \
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50 e = mkstemp(b); \
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51 if (e != -1) close(e); \
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52 e = (e == -1); }
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53
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54 #elif !defined(lua_tmpnam)
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55
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56 #define LUA_TMPNAMBUFSIZE L_tmpnam
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57 #define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
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58
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59 #endif
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60
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61
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62 /*
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63 ** By default, Lua uses gmtime/localtime, except when POSIX is available,
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64 ** where it uses gmtime_r/localtime_r
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65 */
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66 #if defined(LUA_USE_GMTIME_R)
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67
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68 #define l_gmtime(t,r) gmtime_r(t,r)
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69 #define l_localtime(t,r) localtime_r(t,r)
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70
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71 #elif !defined(l_gmtime)
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72
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73 #define l_gmtime(t,r) ((void)r, gmtime(t))
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74 #define l_localtime(t,r) ((void)r, localtime(t))
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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 static int os_execute (lua_State *L) {
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81 const char *cmd = luaL_optstring(L, 1, NULL);
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82 int stat = system(cmd);
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83 if (cmd != NULL)
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84 return luaL_execresult(L, stat);
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85 else {
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86 lua_pushboolean(L, stat); /* true if there is a shell */
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87 return 1;
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88 }
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89 }
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90
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91
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92 static int os_remove (lua_State *L) {
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93 const char *filename = luaL_checkstring(L, 1);
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94 return luaL_fileresult(L, remove(filename) == 0, filename);
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95 }
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96
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97
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98 static int os_rename (lua_State *L) {
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99 const char *fromname = luaL_checkstring(L, 1);
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100 const char *toname = luaL_checkstring(L, 2);
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101 return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
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102 }
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103
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104
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105 static int os_tmpname (lua_State *L) {
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106 char buff[LUA_TMPNAMBUFSIZE];
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107 int err;
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108 lua_tmpnam(buff, err);
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109 if (err)
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110 return luaL_error(L, "unable to generate a unique filename");
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111 lua_pushstring(L, buff);
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112 return 1;
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113 }
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114
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115
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116 static int os_getenv (lua_State *L) {
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117 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
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118 return 1;
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119 }
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120
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121
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122 static int os_clock (lua_State *L) {
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123 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
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124 return 1;
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125 }
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126
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127
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128 /*
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129 ** {======================================================
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130 ** Time/Date operations
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131 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
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132 ** wday=%w+1, yday=%j, isdst=? }
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133 ** =======================================================
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134 */
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135
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136 static void setfield (lua_State *L, const char *key, int value) {
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137 lua_pushinteger(L, value);
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138 lua_setfield(L, -2, key);
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139 }
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140
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141 static void setboolfield (lua_State *L, const char *key, int value) {
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142 if (value < 0) /* undefined? */
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143 return; /* does not set field */
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144 lua_pushboolean(L, value);
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145 lua_setfield(L, -2, key);
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146 }
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147
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148 static int getboolfield (lua_State *L, const char *key) {
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149 int res;
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150 lua_getfield(L, -1, key);
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151 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
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152 lua_pop(L, 1);
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153 return res;
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154 }
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155
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156
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157 static int getfield (lua_State *L, const char *key, int d) {
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158 int res, isnum;
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159 lua_getfield(L, -1, key);
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160 res = (int)lua_tointegerx(L, -1, &isnum);
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161 if (!isnum) {
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162 if (d < 0)
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163 return luaL_error(L, "field " LUA_QS " missing in date table", key);
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164 res = d;
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165 }
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166 lua_pop(L, 1);
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167 return res;
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168 }
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169
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170
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171 static const char *checkoption (lua_State *L, const char *conv, char *buff) {
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172 static const char *const options[] = LUA_STRFTIMEOPTIONS;
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173 unsigned int i;
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174 for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {
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175 if (*conv != '\0' && strchr(options[i], *conv) != NULL) {
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176 buff[1] = *conv;
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177 if (*options[i + 1] == '\0') { /* one-char conversion specifier? */
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178 buff[2] = '\0'; /* end buffer */
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179 return conv + 1;
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180 }
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181 else if (*(conv + 1) != '\0' &&
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182 strchr(options[i + 1], *(conv + 1)) != NULL) {
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183 buff[2] = *(conv + 1); /* valid two-char conversion specifier */
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184 buff[3] = '\0'; /* end buffer */
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185 return conv + 2;
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186 }
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187 }
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188 }
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189 luaL_argerror(L, 1,
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190 lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));
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191 return conv; /* to avoid warnings */
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192 }
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193
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194
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195 static int os_date (lua_State *L) {
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196 const char *s = luaL_optstring(L, 1, "%c");
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197 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
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198 struct tm tmr, *stm;
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199 if (*s == '!') { /* UTC? */
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200 stm = l_gmtime(&t, &tmr);
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201 s++; /* skip `!' */
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202 }
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203 else
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204 stm = l_localtime(&t, &tmr);
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205 if (stm == NULL) /* invalid date? */
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206 lua_pushnil(L);
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207 else if (strcmp(s, "*t") == 0) {
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208 lua_createtable(L, 0, 9); /* 9 = number of fields */
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209 setfield(L, "sec", stm->tm_sec);
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210 setfield(L, "min", stm->tm_min);
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211 setfield(L, "hour", stm->tm_hour);
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212 setfield(L, "day", stm->tm_mday);
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213 setfield(L, "month", stm->tm_mon+1);
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214 setfield(L, "year", stm->tm_year+1900);
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215 setfield(L, "wday", stm->tm_wday+1);
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216 setfield(L, "yday", stm->tm_yday+1);
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217 setboolfield(L, "isdst", stm->tm_isdst);
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218 }
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219 else {
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220 char cc[4];
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221 luaL_Buffer b;
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222 cc[0] = '%';
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223 luaL_buffinit(L, &b);
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224 while (*s) {
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225 if (*s != '%') /* no conversion specifier? */
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226 luaL_addchar(&b, *s++);
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227 else {
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228 size_t reslen;
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229 char buff[200]; /* should be big enough for any conversion result */
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230 s = checkoption(L, s + 1, cc);
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231 reslen = strftime(buff, sizeof(buff), cc, stm);
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232 luaL_addlstring(&b, buff, reslen);
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233 }
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234 }
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235 luaL_pushresult(&b);
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236 }
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237 return 1;
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238 }
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239
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240
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241 static int os_time (lua_State *L) {
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242 time_t t;
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243 if (lua_isnoneornil(L, 1)) /* called without args? */
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244 t = time(NULL); /* get current time */
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245 else {
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246 struct tm ts;
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247 luaL_checktype(L, 1, LUA_TTABLE);
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248 lua_settop(L, 1); /* make sure table is at the top */
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249 ts.tm_sec = getfield(L, "sec", 0);
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250 ts.tm_min = getfield(L, "min", 0);
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251 ts.tm_hour = getfield(L, "hour", 12);
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252 ts.tm_mday = getfield(L, "day", -1);
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253 ts.tm_mon = getfield(L, "month", -1) - 1;
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254 ts.tm_year = getfield(L, "year", -1) - 1900;
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255 ts.tm_isdst = getboolfield(L, "isdst");
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256 t = mktime(&ts);
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257 }
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258 if (t == (time_t)(-1))
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259 lua_pushnil(L);
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260 else
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261 lua_pushnumber(L, (lua_Number)t);
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262 return 1;
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263 }
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264
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265
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266 static int os_difftime (lua_State *L) {
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267 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
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268 (time_t)(luaL_optnumber(L, 2, 0))));
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269 return 1;
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270 }
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271
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272 /* }====================================================== */
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273
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274
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275 static int os_setlocale (lua_State *L) {
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276 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
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277 LC_NUMERIC, LC_TIME};
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278 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
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279 "numeric", "time", NULL};
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280 const char *l = luaL_optstring(L, 1, NULL);
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281 int op = luaL_checkoption(L, 2, "all", catnames);
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282 lua_pushstring(L, setlocale(cat[op], l));
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283 return 1;
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284 }
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285
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286
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287 static int os_exit (lua_State *L) {
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288 int status;
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289 if (lua_isboolean(L, 1))
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290 status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE);
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291 else
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292 status = luaL_optint(L, 1, EXIT_SUCCESS);
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293 if (lua_toboolean(L, 2))
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294 lua_close(L);
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295 if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */
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296 return 0;
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297 }
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298
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299
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300 static const luaL_Reg syslib[] = {
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301 {"clock", os_clock},
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302 {"date", os_date},
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303 {"difftime", os_difftime},
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304 {"execute", os_execute},
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305 {"exit", os_exit},
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306 {"getenv", os_getenv},
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307 {"remove", os_remove},
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308 {"rename", os_rename},
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309 {"setlocale", os_setlocale},
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310 {"time", os_time},
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311 {"tmpname", os_tmpname},
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312 {NULL, NULL}
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313 };
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314
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315 /* }====================================================== */
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316
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317
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318
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319 LUAMOD_API int luaopen_os (lua_State *L) {
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320 luaL_newlib(L, syslib);
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321 return 1;
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322 }
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323
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