/* ** $Id: loslib.c,v 1.65 2016/07/18 17:58:58 roberto Exp roberto $ ** Standard Operating System library ** See Copyright Notice in lua.h */ #define loslib_c #define LUA_LIB #include "lprefix.h" #include #include #include #include #include #include "lua.h" #include "lauxlib.h" #include "lualib.h" /* ** {================================================================== ** List of valid conversion specifiers for the 'strftime' function; ** options are grouped by length; group of length 2 start with '||'. ** =================================================================== */ #if !defined(LUA_STRFTIMEOPTIONS) /* { */ /* options for ANSI C 89 (only 1-char options) */ #define L_STRFTIMEC89 "aAbBcdHIjmMpSUwWxXyYZ%" /* options for ISO C 99 and POSIX */ #define L_STRFTIMEC99 "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%" \ "||" "EcECExEXEyEY" "OdOeOHOIOmOMOSOuOUOVOwOWOy" /* two-char options */ /* options for Windows */ #define L_STRFTIMEWIN "aAbBcdHIjmMpSUwWxXyYzZ%" \ "||" "#c#x#d#H#I#j#m#M#S#U#w#W#y#Y" /* two-char options */ #if defined(LUA_USE_WINDOWS) #define LUA_STRFTIMEOPTIONS L_STRFTIMEWIN #elif defined(LUA_USE_C89) #define LUA_STRFTIMEOPTIONS L_STRFTIMEC89 #else /* C99 specification */ #define LUA_STRFTIMEOPTIONS L_STRFTIMEC99 #endif #endif /* } */ /* }================================================================== */ /* ** {================================================================== ** Configuration for time-related stuff ** =================================================================== */ #if !defined(l_time_t) /* { */ /* ** type to represent time_t in Lua */ #define l_timet lua_Integer #define l_pushtime(L,t) lua_pushinteger(L,(lua_Integer)(t)) static time_t l_checktime (lua_State *L, int arg) { lua_Integer t = luaL_checkinteger(L, arg); luaL_argcheck(L, (time_t)t == t, arg, "time out-of-bounds"); return (time_t)t; } #endif /* } */ #if !defined(l_gmtime) /* { */ /* ** By default, Lua uses gmtime/localtime, except when POSIX is available, ** where it uses gmtime_r/localtime_r */ #if defined(LUA_USE_POSIX) /* { */ #define l_gmtime(t,r) gmtime_r(t,r) #define l_localtime(t,r) localtime_r(t,r) #else /* }{ */ /* ISO C definitions */ #define l_gmtime(t,r) ((void)(r)->tm_sec, gmtime(t)) #define l_localtime(t,r) ((void)(r)->tm_sec, localtime(t)) #endif /* } */ #endif /* } */ /* }================================================================== */ /* ** {================================================================== ** Configuration for 'tmpnam': ** By default, Lua uses tmpnam except when POSIX is available, where ** it uses mkstemp. ** =================================================================== */ #if !defined(lua_tmpnam) /* { */ #if defined(LUA_USE_POSIX) /* { */ #include #define LUA_TMPNAMBUFSIZE 32 #if !defined(LUA_TMPNAMTEMPLATE) #define LUA_TMPNAMTEMPLATE "/tmp/lua_XXXXXX" #endif #define lua_tmpnam(b,e) { \ strcpy(b, LUA_TMPNAMTEMPLATE); \ e = mkstemp(b); \ if (e != -1) close(e); \ e = (e == -1); } #else /* }{ */ /* ISO C definitions */ #define LUA_TMPNAMBUFSIZE L_tmpnam #define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); } #endif /* } */ #endif /* } */ /* }================================================================== */ static int os_execute (lua_State *L) { const char *cmd = luaL_optstring(L, 1, NULL); int stat = system(cmd); if (cmd != NULL) return luaL_execresult(L, stat); else { lua_pushboolean(L, stat); /* true if there is a shell */ return 1; } } static int os_remove (lua_State *L) { const char *filename = luaL_checkstring(L, 1); return luaL_fileresult(L, remove(filename) == 0, filename); } static int os_rename (lua_State *L) { const char *fromname = luaL_checkstring(L, 1); const char *toname = luaL_checkstring(L, 2); return luaL_fileresult(L, rename(fromname, toname) == 0, NULL); } static int os_tmpname (lua_State *L) { char buff[LUA_TMPNAMBUFSIZE]; int err; lua_tmpnam(buff, err); if (err) return luaL_error(L, "unable to generate a unique filename"); lua_pushstring(L, buff); return 1; } static int os_getenv (lua_State *L) { lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */ return 1; } static int os_clock (lua_State *L) { lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC); return 1; } /* ** {====================================================== ** Time/Date operations ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S, ** wday=%w+1, yday=%j, isdst=? } ** ======================================================= */ static void setfield (lua_State *L, const char *key, int value) { lua_pushinteger(L, value); lua_setfield(L, -2, key); } static void setboolfield (lua_State *L, const char *key, int value) { if (value < 0) /* undefined? */ return; /* does not set field */ lua_pushboolean(L, value); lua_setfield(L, -2, key); } /* ** Set all fields from structure 'tm' in the table on top of the stack */ static void setallfields (lua_State *L, struct tm *stm) { setfield(L, "sec", stm->tm_sec); setfield(L, "min", stm->tm_min); setfield(L, "hour", stm->tm_hour); setfield(L, "day", stm->tm_mday); setfield(L, "month", stm->tm_mon + 1); setfield(L, "year", stm->tm_year + 1900); setfield(L, "wday", stm->tm_wday + 1); setfield(L, "yday", stm->tm_yday + 1); setboolfield(L, "isdst", stm->tm_isdst); } static int getboolfield (lua_State *L, const char *key) { int res; res = (lua_getfield(L, -1, key) == LUA_TNIL) ? -1 : lua_toboolean(L, -1); lua_pop(L, 1); return res; } /* maximum value for date fields (to avoid arithmetic overflows with 'int') */ #if !defined(L_MAXDATEFIELD) #define L_MAXDATEFIELD (INT_MAX / 2) #endif static int getfield (lua_State *L, const char *key, int d, int delta) { int isnum; int t = lua_getfield(L, -1, key); /* get field and its type */ lua_Integer res = lua_tointegerx(L, -1, &isnum); if (!isnum) { /* field is not an integer? */ if (t != LUA_TNIL) /* some other value? */ return luaL_error(L, "field '%s' is not an integer", key); else if (d < 0) /* absent field; no default? */ return luaL_error(L, "field '%s' missing in date table", key); res = d; } else { if (!(-L_MAXDATEFIELD <= res && res <= L_MAXDATEFIELD)) return luaL_error(L, "field '%s' is out-of-bound", key); res -= delta; } lua_pop(L, 1); return (int)res; } static const char *checkoption (lua_State *L, const char *conv, ptrdiff_t convlen, char *buff) { const char *option = LUA_STRFTIMEOPTIONS; int oplen = 1; /* length of options being checked */ for (; *option != '\0' && oplen <= convlen; option += oplen) { if (*option == '|') /* next block? */ oplen++; /* will check options with next length (+1) */ else if (memcmp(conv, option, oplen) == 0) { /* match? */ memcpy(buff, conv, oplen); /* copy valid option to buffer */ buff[oplen] = '\0'; return conv + oplen; /* return next item */ } } luaL_argerror(L, 1, lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv)); return conv; /* to avoid warnings */ } /* maximum size for an individual 'strftime' item */ #define SIZETIMEFMT 250 static int os_date (lua_State *L) { size_t slen; const char *s = luaL_optlstring(L, 1, "%c", &slen); time_t t = luaL_opt(L, l_checktime, 2, time(NULL)); const char *se = s + slen; /* 's' end */ struct tm tmr, *stm; if (*s == '!') { /* UTC? */ stm = l_gmtime(&t, &tmr); s++; /* skip '!' */ } else stm = l_localtime(&t, &tmr); if (stm == NULL) /* invalid date? */ return luaL_error(L, "time result cannot be represented in this installation"); if (strcmp(s, "*t") == 0) { lua_createtable(L, 0, 9); /* 9 = number of fields */ setallfields(L, stm); } else { char cc[4]; /* buffer for individual conversion specifiers */ luaL_Buffer b; cc[0] = '%'; luaL_buffinit(L, &b); while (s < se) { if (*s != '%') /* not a conversion specifier? */ luaL_addchar(&b, *s++); else { size_t reslen; char *buff = luaL_prepbuffsize(&b, SIZETIMEFMT); s++; /* skip '%' */ s = checkoption(L, s, se - s, cc + 1); /* copy specifier to 'cc' */ reslen = strftime(buff, SIZETIMEFMT, cc, stm); luaL_addsize(&b, reslen); } } luaL_pushresult(&b); } return 1; } static int os_time (lua_State *L) { time_t t; if (lua_isnoneornil(L, 1)) /* called without args? */ t = time(NULL); /* get current time */ else { struct tm ts; luaL_checktype(L, 1, LUA_TTABLE); lua_settop(L, 1); /* make sure table is at the top */ ts.tm_sec = getfield(L, "sec", 0, 0); ts.tm_min = getfield(L, "min", 0, 0); ts.tm_hour = getfield(L, "hour", 12, 0); ts.tm_mday = getfield(L, "day", -1, 0); ts.tm_mon = getfield(L, "month", -1, 1); ts.tm_year = getfield(L, "year", -1, 1900); ts.tm_isdst = getboolfield(L, "isdst"); t = mktime(&ts); setallfields(L, &ts); /* update fields with normalized values */ } if (t != (time_t)(l_timet)t || t == (time_t)(-1)) return luaL_error(L, "time result cannot be represented in this installation"); l_pushtime(L, t); return 1; } static int os_difftime (lua_State *L) { time_t t1 = l_checktime(L, 1); time_t t2 = l_checktime(L, 2); lua_pushnumber(L, (lua_Number)difftime(t1, t2)); return 1; } /* }====================================================== */ static int os_setlocale (lua_State *L) { static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME}; static const char *const catnames[] = {"all", "collate", "ctype", "monetary", "numeric", "time", NULL}; const char *l = luaL_optstring(L, 1, NULL); int op = luaL_checkoption(L, 2, "all", catnames); lua_pushstring(L, setlocale(cat[op], l)); return 1; } static int os_exit (lua_State *L) { int status; if (lua_isboolean(L, 1)) status = (lua_toboolean(L, 1) ? EXIT_SUCCESS : EXIT_FAILURE); else status = (int)luaL_optinteger(L, 1, EXIT_SUCCESS); if (lua_toboolean(L, 2)) lua_close(L); if (L) exit(status); /* 'if' to avoid warnings for unreachable 'return' */ return 0; } static const luaL_Reg syslib[] = { {"clock", os_clock}, {"date", os_date}, {"difftime", os_difftime}, {"execute", os_execute}, {"exit", os_exit}, {"getenv", os_getenv}, {"remove", os_remove}, {"rename", os_rename}, {"setlocale", os_setlocale}, {"time", os_time}, {"tmpname", os_tmpname}, {NULL, NULL} }; /* }====================================================== */ LUAMOD_API int luaopen_os (lua_State *L) { luaL_newlib(L, syslib); return 1; }