loslib.c
上传用户:yisoukefu
上传日期:2020-08-09
资源大小:39506k
文件大小:6k
- /*
- ** $Id: loslib.c,v 1.17 2006/01/27 13:54:31 roberto Exp $
- ** Standard Operating System library
- ** See Copyright Notice in lua.h
- */
- #include <errno.h>
- #include <locale.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #define loslib_c
- #define LUA_LIB
- #include "lua.h"
- #include "lauxlib.h"
- #include "lualib.h"
- static int os_pushresult (lua_State *L, int i, const char *filename) {
- int en = errno; /* calls to Lua API may change this value */
- if (i) {
- lua_pushboolean(L, 1);
- return 1;
- }
- else {
- lua_pushnil(L);
- if (filename)
- lua_pushfstring(L, "%s: %s", filename, strerror(en));
- else
- lua_pushfstring(L, "%s", strerror(en));
- lua_pushinteger(L, en);
- return 3;
- }
- }
- static int os_execute (lua_State *L) {
- lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
- return 1;
- }
- static int os_remove (lua_State *L) {
- const char *filename = luaL_checkstring(L, 1);
- return os_pushresult(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 os_pushresult(L, rename(fromname, toname) == 0, fromname);
- }
- 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);
- }
- static int getboolfield (lua_State *L, const char *key) {
- int res;
- lua_getfield(L, -1, key);
- res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
- lua_pop(L, 1);
- return res;
- }
- static int getfield (lua_State *L, const char *key, int d) {
- int res;
- lua_getfield(L, -1, key);
- if (lua_isnumber(L, -1))
- res = (int)lua_tointeger(L, -1);
- else {
- if (d < 0)
- return luaL_error(L, "field " LUA_QS " missing in date table", key);
- res = d;
- }
- lua_pop(L, 1);
- return res;
- }
- static int os_date (lua_State *L) {
- const char *s = luaL_optstring(L, 1, "%c");
- time_t t = lua_isnoneornil(L, 2) ? time(NULL) :
- (time_t)luaL_checknumber(L, 2);
- struct tm *stm;
- if (*s == '!') { /* UTC? */
- stm = gmtime(&t);
- s++; /* skip `!' */
- }
- else
- stm = localtime(&t);
- if (stm == NULL) /* invalid date? */
- lua_pushnil(L);
- else if (strcmp(s, "*t") == 0) {
- lua_createtable(L, 0, 9); /* 9 = number of fields */
- 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);
- }
- else {
- char b[256];
- if (strftime(b, sizeof(b), s, stm))
- lua_pushstring(L, b);
- else
- return luaL_error(L, LUA_QL("date") " format too long");
- }
- 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);
- ts.tm_min = getfield(L, "min", 0);
- ts.tm_hour = getfield(L, "hour", 12);
- ts.tm_mday = getfield(L, "day", -1);
- 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);
- }
- if (t == (time_t)(-1))
- lua_pushnil(L);
- else
- lua_pushnumber(L, (lua_Number)t);
- return 1;
- }
- static int os_difftime (lua_State *L) {
- lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
- (time_t)(luaL_optnumber(L, 2, 0))));
- 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 = lua_tostring(L, 1);
- int op = luaL_checkoption(L, 2, "all", catnames);
- luaL_argcheck(L, l || lua_isnoneornil(L, 1), 1, "string expected");
- lua_pushstring(L, setlocale(cat[op], l));
- return 1;
- }
- static int os_exit (lua_State *L) {
- exit(luaL_optint(L, 1, EXIT_SUCCESS));
- return 0; /* to avoid warnings */
- }
- 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}
- };
- /* }====================================================== */
- LUALIB_API int luaopen_os (lua_State *L) {
- luaL_register(L, LUA_OSLIBNAME, syslib);
- return 1;
- }