1/* 2** $Id: loslib.c,v 1.65.1.1 2017/04/19 17:29:57 roberto Exp $ 3** Standard Operating System library 4** See Copyright Notice in lua.h 5*/ 6 7#define loslib_c 8#define LUA_LIB 9 10#include "lprefix.h" 11 12 13#include <errno.h> 14#include <locale.h> 15#include <stdlib.h> 16#include <string.h> 17#include <time.h> 18 19#include "lua.h" 20 21#include "lauxlib.h" 22#include "lualib.h" 23 24 25/* 26** {================================================================== 27** List of valid conversion specifiers for the 'strftime' function; 28** options are grouped by length; group of length 2 start with '||'. 29** =================================================================== 30*/ 31#if !defined(LUA_STRFTIMEOPTIONS) /* { */ 32 33/* options for ANSI C 89 (only 1-char options) */ 34#define L_STRFTIMEC89 "aAbBcdHIjmMpSUwWxXyYZ%" 35 36/* options for ISO C 99 and POSIX */ 37#define L_STRFTIMEC99 "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \ 38 "||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy" /* two-char options */ 39 40/* options for Windows */ 41#define L_STRFTIMEWIN "aAbBcdHIjmMpSUwWxXyYzZ%" \ 42 "||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y" /* two-char options */ 43 44#if defined(LUA_USE_WINDOWS) 45#define LUA_STRFTIMEOPTIONS L_STRFTIMEWIN 46#elif defined(LUA_USE_C89) 47#define LUA_STRFTIMEOPTIONS L_STRFTIMEC89 48#else /* C99 specification */ 49#define LUA_STRFTIMEOPTIONS L_STRFTIMEC99 50#endif 51 52#endif /* } */ 53/* }================================================================== */ 54 55 56/* 57** {================================================================== 58** Configuration for time-related stuff 59** =================================================================== 60*/ 61 62#if !defined(l_time_t) /* { */ 63/* 64** type to represent time_t in Lua 65*/ 66#define l_timet lua_Integer 67#define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t)) 68 69static time_t l_checktime (lua_State *L, int arg) { 70 lua_Integer t = luaL_checkinteger(L, arg); 71 luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds"); 72 return (time_t)t; 73} 74 75#endif /* } */ 76 77 78#if !defined(l_gmtime) /* { */ 79/* 80** By default, Lua uses gmtime/localtime, except when POSIX is available, 81** where it uses gmtime_r/localtime_r 82*/ 83 84#if defined(LUA_USE_POSIX) /* { */ 85 86#define l_gmtime(t,r) gmtime_r(t,r) 87#define l_localtime(t,r) localtime_r(t,r) 88 89#else /* }{ */ 90 91/* ISO C definitions */ 92#define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t)) 93#define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t)) 94 95#endif /* } */ 96 97#endif /* } */ 98 99/* }================================================================== */ 100 101 102/* 103** {================================================================== 104** Configuration for 'tmpnam': 105** By default, Lua uses tmpnam except when POSIX is available, where 106** it uses mkstemp. 107** =================================================================== 108*/ 109#if !defined(lua_tmpnam) /* { */ 110 111#if defined(LUA_USE_POSIX) /* { */ 112 113#include <unistd.h> 114 115#define LUA_TMPNAMBUFSIZE 32 116 117#if !defined(LUA_TMPNAMTEMPLATE) 118#define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX" 119#endif 120 121#define lua_tmpnam(b,e) { \ 122 strcpy(b, LUA_TMPNAMTEMPLATE); \ 123 e = mkstemp(b); \ 124 if (e != -1) close(e); \ 125 e = (e == -1); } 126 127#else /* }{ */ 128 129/* ISO C definitions */ 130#define LUA_TMPNAMBUFSIZE L_tmpnam 131#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); } 132 133#endif /* } */ 134 135#endif /* } */ 136/* }================================================================== */ 137 138 139 140 141static int os_execute (lua_State *L) { 142 const char *cmd = luaL_optstring(L, 1, NULL); 143 int stat = system(cmd); 144 if (cmd != NULL) 145 return luaL_execresult(L, stat); 146 else { 147 lua_pushboolean(L, stat); /* true if there is a shell */ 148 return 1; 149 } 150} 151 152 153static int os_remove (lua_State *L) { 154 const char *filename = luaL_checkstring(L, 1); 155 return luaL_fileresult(L, remove(filename) == 0, filename); 156} 157 158 159static int os_rename (lua_State *L) { 160 const char *fromname = luaL_checkstring(L, 1); 161 const char *toname = luaL_checkstring(L, 2); 162 return luaL_fileresult(L, rename(fromname, toname) == 0, NULL); 163} 164 165 166static int os_tmpname (lua_State *L) { 167 char buff[LUA_TMPNAMBUFSIZE]; 168 int err; 169 lua_tmpnam(buff, err); 170 if (err) 171 return luaL_error(L, "unable to generate a unique filename"); 172 lua_pushstring(L, buff); 173 return 1; 174} 175 176 177static int os_getenv (lua_State *L) { 178 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */ 179 return 1; 180} 181 182 183static int os_clock (lua_State *L) { 184 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC); 185 return 1; 186} 187 188 189/* 190** {====================================================== 191** Time/Date operations 192** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S, 193** wday=%w+1, yday=%j, isdst=? } 194** ======================================================= 195*/ 196 197static void setfield (lua_State *L, const char *key, int value) { 198 lua_pushinteger(L, value); 199 lua_setfield(L, -2, key); 200} 201 202static void setboolfield (lua_State *L, const char *key, int value) { 203 if (value < 0) /* undefined? */ 204 return; /* does not set field */ 205 lua_pushboolean(L, value); 206 lua_setfield(L, -2, key); 207} 208 209 210/* 211** Set all fields from structure 'tm' in the table on top of the stack 212*/ 213static void setallfields (lua_State *L, struct tm *stm) { 214 setfield(L, "sec", stm->tm_sec); 215 setfield(L, "min", stm->tm_min); 216 setfield(L, "hour", stm->tm_hour); 217 setfield(L, "day", stm->tm_mday); 218 setfield(L, "month", stm->tm_mon + 1); 219 setfield(L, "year", stm->tm_year + 1900); 220 setfield(L, "wday", stm->tm_wday + 1); 221 setfield(L, "yday", stm->tm_yday + 1); 222 setboolfield(L, "isdst", stm->tm_isdst); 223} 224 225 226static int getboolfield (lua_State *L, const char *key) { 227 int res; 228 res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1); 229 lua_pop(L, 1); 230 return res; 231} 232 233 234/* maximum value for date fields (to avoid arithmetic overflows with 'int') */ 235#if !defined(L_MAXDATEFIELD) 236#define L_MAXDATEFIELD (INT_MAX / 2) 237#endif 238 239static int getfield (lua_State *L, const char *key, int d, int delta) { 240 int isnum; 241 int t = lua_getfield(L, -1, key); /* get field and its type */ 242 lua_Integer res = lua_tointegerx(L, -1, &isnum); 243 if (!isnum) { /* field is not an integer? */ 244 if (t != LUA_TNIL) /* some other value? */ 245 return luaL_error(L, "field '%s' is not an integer", key); 246 else if (d < 0) /* absent field; no default? */ 247 return luaL_error(L, "field '%s' missing in date table", key); 248 res = d; 249 } 250 else { 251 if (!(-L_MAXDATEFIELD <= res && res <= L_MAXDATEFIELD)) 252 return luaL_error(L, "field '%s' is out-of-bound", key); 253 res -= delta; 254 } 255 lua_pop(L, 1); 256 return (int)res; 257} 258 259 260static const char *checkoption (lua_State *L, const char *conv, 261 ptrdiff_t convlen, char *buff) { 262 const char *option = LUA_STRFTIMEOPTIONS; 263 int oplen = 1; /* length of options being checked */ 264 for (; *option != '\0' && oplen <= convlen; option += oplen) { 265 if (*option == '|') /* next block? */ 266 oplen++; /* will check options with next length (+1) */ 267 else if (memcmp(conv, option, oplen) == 0) { /* match? */ 268 memcpy(buff, conv, oplen); /* copy valid option to buffer */ 269 buff[oplen] = '\0'; 270 return conv + oplen; /* return next item */ 271 } 272 } 273 luaL_argerror(L, 1, 274 lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv)); 275 return conv; /* to avoid warnings */ 276} 277 278 279/* maximum size for an individual 'strftime' item */ 280#define SIZETIMEFMT 250 281 282 283static int os_date (lua_State *L) { 284 size_t slen; 285 const char *s = luaL_optlstring(L, 1, "%c", &slen); 286 time_t t = luaL_opt(L, l_checktime, 2, time(NULL)); 287 const char *se = s + slen; /* 's' end */ 288 struct tm tmr, *stm; 289 if (*s == '!') { /* UTC? */ 290 stm = l_gmtime(&t, &tmr); 291 s++; /* skip '!' */ 292 } 293 else 294 stm = l_localtime(&t, &tmr); 295 if (stm == NULL) /* invalid date? */ 296 return luaL_error(L, 297 "time result cannot be represented in this installation"); 298 if (strcmp(s, "*t") == 0) { 299 lua_createtable(L, 0, 9); /* 9 = number of fields */ 300 setallfields(L, stm); 301 } 302 else { 303 char cc[4]; /* buffer for individual conversion specifiers */ 304 luaL_Buffer b; 305 cc[0] = '%'; 306 luaL_buffinit(L, &b); 307 while (s < se) { 308 if (*s != '%') /* not a conversion specifier? */ 309 luaL_addchar(&b, *s++); 310 else { 311 size_t reslen; 312 char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT); 313 s++; /* skip '%' */ 314 s = checkoption(L, s, se - s, cc + 1); /* copy specifier to 'cc' */ 315 reslen = strftime(buff, SIZETIMEFMT, cc, stm); 316 luaL_addsize(&b, reslen); 317 } 318 } 319 luaL_pushresult(&b); 320 } 321 return 1; 322} 323 324 325static int os_time (lua_State *L) { 326 time_t t; 327 if (lua_isnoneornil(L, 1)) /* called without args? */ 328 t = time(NULL); /* get current time */ 329 else { 330 struct tm ts; 331 luaL_checktype(L, 1, LUA_TTABLE); 332 lua_settop(L, 1); /* make sure table is at the top */ 333 ts.tm_sec = getfield(L, "sec", 0, 0); 334 ts.tm_min = getfield(L, "min", 0, 0); 335 ts.tm_hour = getfield(L, "hour", 12, 0); 336 ts.tm_mday = getfield(L, "day", -1, 0); 337 ts.tm_mon = getfield(L, "month", -1, 1); 338 ts.tm_year = getfield(L, "year", -1, 1900); 339 ts.tm_isdst = getboolfield(L, "isdst"); 340 t = mktime(&ts); 341 setallfields(L, &ts); /* update fields with normalized values */ 342 } 343 if (t != (time_t)(l_timet)t || t == (time_t)(-1)) 344 return luaL_error(L, 345 "time result cannot be represented in this installation"); 346 l_pushtime(L, t); 347 return 1; 348} 349 350 351static int os_difftime (lua_State *L) { 352 time_t t1 = l_checktime(L, 1); 353 time_t t2 = l_checktime(L, 2); 354 lua_pushnumber(L, (lua_Number)difftime(t1, t2)); 355 return 1; 356} 357 358/* }====================================================== */ 359 360 361static int os_setlocale (lua_State *L) { 362 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, 363 LC_NUMERIC, LC_TIME}; 364 static const char *const catnames[] = {"all", "collate", "ctype", "monetary", 365 "numeric", "time", NULL}; 366 const char *l = luaL_optstring(L, 1, NULL); 367 int op = luaL_checkoption(L, 2, "all", catnames); 368 lua_pushstring(L, setlocale(cat[op], l)); 369 return 1; 370} 371 372 373static int os_exit (lua_State *L) { 374 int status; 375 if (lua_isboolean(L, 1)) 376 status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE); 377 else 378 status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS); 379 if (lua_toboolean(L, 2)) 380 lua_close(L); 381 if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */ 382 return 0; 383} 384 385 386static const luaL_Reg syslib[] = { 387 {"clock", os_clock}, 388 {"date", os_date}, 389 {"difftime", os_difftime}, 390 {"execute", os_execute}, 391 {"exit", os_exit}, 392 {"getenv", os_getenv}, 393 {"remove", os_remove}, 394 {"rename", os_rename}, 395 {"setlocale", os_setlocale}, 396 {"time", os_time}, 397 {"tmpname", os_tmpname}, 398 {NULL, NULL} 399}; 400 401/* }====================================================== */ 402 403 404 405LUAMOD_API int luaopen_os (lua_State *L) { 406 luaL_newlib(L, syslib); 407 return 1; 408} 409 410