mirror of
https://github.com/lua/lua.git
synced 2024-11-24 02:33:48 +08:00
258 lines
6.3 KiB
C
258 lines
6.3 KiB
C
/*
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** $Id: loslib.c,v 1.23 2008/01/18 15:37:10 roberto Exp roberto $
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** Standard Operating System library
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** See Copyright Notice in lua.h
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*/
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#include <errno.h>
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#define loslib_c
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#define LUA_LIB
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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static int os_pushresult (lua_State *L, int i, const char *filename) {
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int en = errno; /* calls to Lua API may change this value */
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if (i) {
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lua_pushboolean(L, 1);
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return 1;
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}
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else {
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lua_pushnil(L);
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lua_pushfstring(L, "%s: %s", filename, strerror(en));
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lua_pushinteger(L, en);
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return 3;
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}
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}
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static int os_execute (lua_State *L) {
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lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
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return 1;
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}
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static int os_remove (lua_State *L) {
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const char *filename = luaL_checkstring(L, 1);
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return os_pushresult(L, remove(filename) == 0, filename);
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}
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static int os_rename (lua_State *L) {
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const char *fromname = luaL_checkstring(L, 1);
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const char *toname = luaL_checkstring(L, 2);
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return os_pushresult(L, rename(fromname, toname) == 0, fromname);
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}
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static int os_tmpname (lua_State *L) {
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char buff[LUA_TMPNAMBUFSIZE];
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int err;
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lua_tmpnam(buff, err);
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if (err)
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return luaL_error(L, "unable to generate a unique filename");
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lua_pushstring(L, buff);
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return 1;
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}
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static int os_getenv (lua_State *L) {
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lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
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return 1;
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}
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static int os_clock (lua_State *L) {
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lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
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return 1;
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}
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/*
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** {======================================================
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** Time/Date operations
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** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
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** wday=%w+1, yday=%j, isdst=? }
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** =======================================================
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*/
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static void setfield (lua_State *L, const char *key, int value) {
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lua_pushinteger(L, value);
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lua_setfield(L, -2, key);
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}
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static void setboolfield (lua_State *L, const char *key, int value) {
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if (value < 0) /* undefined? */
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return; /* does not set field */
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lua_pushboolean(L, value);
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lua_setfield(L, -2, key);
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}
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static int getboolfield (lua_State *L, const char *key) {
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int res;
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lua_getfield(L, -1, key);
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res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
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lua_pop(L, 1);
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return res;
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}
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static int getfield (lua_State *L, const char *key, int d) {
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int res;
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lua_getfield(L, -1, key);
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if (lua_isnumber(L, -1))
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res = (int)lua_tointeger(L, -1);
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else {
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if (d < 0)
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return luaL_error(L, "field " LUA_QS " missing in date table", key);
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res = d;
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}
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lua_pop(L, 1);
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return res;
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}
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static int os_date (lua_State *L) {
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const char *s = luaL_optstring(L, 1, "%c");
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time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
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struct tm *stm;
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if (*s == '!') { /* UTC? */
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stm = gmtime(&t);
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s++; /* skip `!' */
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}
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else
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stm = localtime(&t);
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if (stm == NULL) /* invalid date? */
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lua_pushnil(L);
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else if (strcmp(s, "*t") == 0) {
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lua_createtable(L, 0, 9); /* 9 = number of fields */
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setfield(L, "sec", stm->tm_sec);
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setfield(L, "min", stm->tm_min);
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setfield(L, "hour", stm->tm_hour);
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setfield(L, "day", stm->tm_mday);
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setfield(L, "month", stm->tm_mon+1);
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setfield(L, "year", stm->tm_year+1900);
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setfield(L, "wday", stm->tm_wday+1);
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setfield(L, "yday", stm->tm_yday+1);
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setboolfield(L, "isdst", stm->tm_isdst);
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}
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else {
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char cc[3];
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luaL_Buffer b;
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cc[0] = '%';
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luaL_buffinit(L, &b);
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for (; *s; s++) {
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if (*s != '%') /* no conversion specifier? */
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luaL_addchar(&b, *s);
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else {
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size_t reslen;
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int i = 1;
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char buff[200]; /* should be big enough for any conversion result */
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if (*(++s) != '\0' && strchr(LUA_STRFTIMEPREFIX, *s))
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cc[i++] = *(s++);
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if (*s != '\0' && strchr(LUA_STRFTIMEOPTIONS, *s))
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cc[i++] = *s;
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else {
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const char *msg = lua_pushfstring(L,
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"invalid conversion specifier '%%%c'", *s);
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return luaL_argerror(L, 1, msg);
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}
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cc[i] = '\0';
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reslen = strftime(buff, sizeof(buff), cc, stm);
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luaL_addlstring(&b, buff, reslen);
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}
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}
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luaL_pushresult(&b);
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}
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return 1;
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}
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static int os_time (lua_State *L) {
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time_t t;
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if (lua_isnoneornil(L, 1)) /* called without args? */
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t = time(NULL); /* get current time */
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else {
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struct tm ts;
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luaL_checktype(L, 1, LUA_TTABLE);
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lua_settop(L, 1); /* make sure table is at the top */
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ts.tm_sec = getfield(L, "sec", 0);
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ts.tm_min = getfield(L, "min", 0);
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ts.tm_hour = getfield(L, "hour", 12);
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ts.tm_mday = getfield(L, "day", -1);
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ts.tm_mon = getfield(L, "month", -1) - 1;
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ts.tm_year = getfield(L, "year", -1) - 1900;
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ts.tm_isdst = getboolfield(L, "isdst");
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t = mktime(&ts);
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}
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if (t == (time_t)(-1))
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lua_pushnil(L);
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else
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lua_pushnumber(L, (lua_Number)t);
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return 1;
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}
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static int os_difftime (lua_State *L) {
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lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
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(time_t)(luaL_optnumber(L, 2, 0))));
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return 1;
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}
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/* }====================================================== */
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static int os_setlocale (lua_State *L) {
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static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
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LC_NUMERIC, LC_TIME};
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static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
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"numeric", "time", NULL};
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const char *l = luaL_optstring(L, 1, NULL);
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int op = luaL_checkoption(L, 2, "all", catnames);
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lua_pushstring(L, setlocale(cat[op], l));
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return 1;
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}
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static int os_exit (lua_State *L) {
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int status = luaL_optint(L, 1, EXIT_SUCCESS);
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if (!lua_toboolean(L, 2))
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lua_close(L);
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exit(status);
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}
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static const luaL_Reg syslib[] = {
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{"clock", os_clock},
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{"date", os_date},
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{"difftime", os_difftime},
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{"execute", os_execute},
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{"exit", os_exit},
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{"getenv", os_getenv},
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{"remove", os_remove},
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{"rename", os_rename},
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{"setlocale", os_setlocale},
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{"time", os_time},
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{"tmpname", os_tmpname},
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{NULL, NULL}
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};
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/* }====================================================== */
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LUALIB_API int luaopen_os (lua_State *L) {
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luaL_register(L, LUA_OSLIBNAME, syslib);
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return 1;
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}
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