Mercurial > vba-linux
view src/lua/loslib.c @ 28:2efb971df515
bringing in SDL package
author | Robert McIntyre <rlm@mit.edu> |
---|---|
date | Sun, 04 Mar 2012 21:06:50 -0600 |
parents | 27763b933818 |
children |
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1 /*2 ** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $3 ** Standard Operating System library4 ** See Copyright Notice in lua.h5 */8 #include <errno.h>9 #include <locale.h>10 #include <stdlib.h>11 #include <string.h>12 #include <time.h>14 #define loslib_c15 #define LUA_LIB17 #include "lua.h"19 #include "lauxlib.h"20 #include "lualib.h"23 static int os_pushresult (lua_State *L, int i, const char *filename) {24 int en = errno; /* calls to Lua API may change this value */25 if (i) {26 lua_pushboolean(L, 1);27 return 1;28 }29 else {30 lua_pushnil(L);31 lua_pushfstring(L, "%s: %s", filename, strerror(en));32 lua_pushinteger(L, en);33 return 3;34 }35 }38 static int os_execute (lua_State *L) {39 lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));40 return 1;41 }44 static int os_remove (lua_State *L) {45 const char *filename = luaL_checkstring(L, 1);46 return os_pushresult(L, remove(filename) == 0, filename);47 }50 static int os_rename (lua_State *L) {51 const char *fromname = luaL_checkstring(L, 1);52 const char *toname = luaL_checkstring(L, 2);53 return os_pushresult(L, rename(fromname, toname) == 0, fromname);54 }57 static int os_tmpname (lua_State *L) {58 char buff[LUA_TMPNAMBUFSIZE];59 int err;60 lua_tmpnam(buff, err);61 if (err)62 return luaL_error(L, "unable to generate a unique filename");63 lua_pushstring(L, buff);64 return 1;65 }68 static int os_getenv (lua_State *L) {69 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */70 return 1;71 }74 static int os_clock (lua_State *L) {75 lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);76 return 1;77 }80 /*81 ** {======================================================82 ** Time/Date operations83 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,84 ** wday=%w+1, yday=%j, isdst=? }85 ** =======================================================86 */88 static void setfield (lua_State *L, const char *key, int value) {89 lua_pushinteger(L, value);90 lua_setfield(L, -2, key);91 }93 static void setboolfield (lua_State *L, const char *key, int value) {94 if (value < 0) /* undefined? */95 return; /* does not set field */96 lua_pushboolean(L, value);97 lua_setfield(L, -2, key);98 }100 static int getboolfield (lua_State *L, const char *key) {101 int res;102 lua_getfield(L, -1, key);103 res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);104 lua_pop(L, 1);105 return res;106 }109 static int getfield (lua_State *L, const char *key, int d) {110 int res;111 lua_getfield(L, -1, key);112 if (lua_isnumber(L, -1))113 res = (int)lua_tointeger(L, -1);114 else {115 if (d < 0)116 return luaL_error(L, "field " LUA_QS " missing in date table", key);117 res = d;118 }119 lua_pop(L, 1);120 return res;121 }124 static int os_date (lua_State *L) {125 const char *s = luaL_optstring(L, 1, "%c");126 time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));127 struct tm *stm;128 if (*s == '!') { /* UTC? */129 stm = gmtime(&t);130 s++; /* skip `!' */131 }132 else133 stm = localtime(&t);134 if (stm == NULL) /* invalid date? */135 lua_pushnil(L);136 else if (strcmp(s, "*t") == 0) {137 lua_createtable(L, 0, 9); /* 9 = number of fields */138 setfield(L, "sec", stm->tm_sec);139 setfield(L, "min", stm->tm_min);140 setfield(L, "hour", stm->tm_hour);141 setfield(L, "day", stm->tm_mday);142 setfield(L, "month", stm->tm_mon+1);143 setfield(L, "year", stm->tm_year+1900);144 setfield(L, "wday", stm->tm_wday+1);145 setfield(L, "yday", stm->tm_yday+1);146 setboolfield(L, "isdst", stm->tm_isdst);147 }148 else {149 char cc[3];150 luaL_Buffer b;151 cc[0] = '%'; cc[2] = '\0';152 luaL_buffinit(L, &b);153 for (; *s; s++) {154 if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */155 luaL_addchar(&b, *s);156 else {157 size_t reslen;158 char buff[200]; /* should be big enough for any conversion result */159 cc[1] = *(++s);160 reslen = strftime(buff, sizeof(buff), cc, stm);161 luaL_addlstring(&b, buff, reslen);162 }163 }164 luaL_pushresult(&b);165 }166 return 1;167 }170 static int os_time (lua_State *L) {171 time_t t;172 if (lua_isnoneornil(L, 1)) /* called without args? */173 t = time(NULL); /* get current time */174 else {175 struct tm ts;176 luaL_checktype(L, 1, LUA_TTABLE);177 lua_settop(L, 1); /* make sure table is at the top */178 ts.tm_sec = getfield(L, "sec", 0);179 ts.tm_min = getfield(L, "min", 0);180 ts.tm_hour = getfield(L, "hour", 12);181 ts.tm_mday = getfield(L, "day", -1);182 ts.tm_mon = getfield(L, "month", -1) - 1;183 ts.tm_year = getfield(L, "year", -1) - 1900;184 ts.tm_isdst = getboolfield(L, "isdst");185 t = mktime(&ts);186 }187 if (t == (time_t)(-1))188 lua_pushnil(L);189 else190 lua_pushnumber(L, (lua_Number)t);191 return 1;192 }195 static int os_difftime (lua_State *L) {196 lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),197 (time_t)(luaL_optnumber(L, 2, 0))));198 return 1;199 }201 /* }====================================================== */204 static int os_setlocale (lua_State *L) {205 static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,206 LC_NUMERIC, LC_TIME};207 static const char *const catnames[] = {"all", "collate", "ctype", "monetary",208 "numeric", "time", NULL};209 const char *l = luaL_optstring(L, 1, NULL);210 int op = luaL_checkoption(L, 2, "all", catnames);211 lua_pushstring(L, setlocale(cat[op], l));212 return 1;213 }216 static int os_exit (lua_State *L) {217 exit(luaL_optint(L, 1, EXIT_SUCCESS));218 }220 static const luaL_Reg syslib[] = {221 {"clock", os_clock},222 {"date", os_date},223 {"difftime", os_difftime},224 {"execute", os_execute},225 {"exit", os_exit},226 {"getenv", os_getenv},227 {"remove", os_remove},228 {"rename", os_rename},229 {"setlocale", os_setlocale},230 {"time", os_time},231 {"tmpname", os_tmpname},232 {NULL, NULL}233 };235 /* }====================================================== */239 LUALIB_API int luaopen_os (lua_State *L) {240 luaL_register(L, LUA_OSLIBNAME, syslib);241 return 1;242 }