/*

** $Id: loslib.c,v 1.40.1.1 2013/04/12 18:48:47 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"

/*

** list of valid conversion specifiers for the 'strftime' function

*/

#if !defined(LUA_STRFTIMEOPTIONS)

#if !defined(LUA_USE_POSIX)

#define LUA_STRFTIMEOPTIONS { "aAbBcdHIjmMpSUwWxXyYz%", "" }

#else

#define LUA_STRFTIMEOPTIONS \

#endif

#endif

/*

** By default, Lua uses tmpnam except when POSIX is available, where it

** uses mkstemp.

*/

#if defined(LUA_USE_MKSTEMP)

#include <unistd.h>

#define LUA_TMPNAMBUFSIZE 32

#define lua_tmpnam(b,e) { \

strcpy(b, "/tmp/lua_XXXXXX"); \

e = mkstemp(b); \

if (e != -1) close(e); \

e = (e == -1); }

#elif !defined(lua_tmpnam)

#define LUA_TMPNAMBUFSIZE L_tmpnam

#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }

#endif

/*

** By default, Lua uses gmtime/localtime, except when POSIX is available,

** where it uses gmtime_r/localtime_r

*/

#if defined(LUA_USE_GMTIME_R)

#define l_gmtime(t,r) gmtime_r(t,r)

#define l_localtime(t,r) localtime_r(t,r)

#elif !defined(l_gmtime)

#define l_gmtime(t,r) ((void)r, gmtime(t))

#define l_localtime(t,r) ((void)r, localtime(t))

#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);

}

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, isnum;

lua_getfield(L, -1, key);

res = (int)lua_tointegerx(L, -1, &isnum);

if (!isnum) {

if (d < 0)

return luaL_error(L, "field " LUA_QS " missing in date table", key);

res = d;

}

lua_pop(L, 1);

return res;

}

static const char *checkoption (lua_State *L, const char *conv, char *buff) {

static const char *const options[] = LUA_STRFTIMEOPTIONS;

unsigned int i;

for (i = 0; i < sizeof(options)/sizeof(options[0]); i += 2) {

if (*conv != '\0' && strchr(options[i], *conv) != NULL) {

buff[1] = *conv;

if (*options[i + 1] == '\0') { /* one-char conversion specifier? */

buff[2] = '\0'; /* end buffer */

return conv + 1;

}

else if (*(conv + 1) != '\0' &&

strchr(options[i + 1], *(conv + 1)) != NULL) {

buff[2] = *(conv + 1); /* valid two-char conversion specifier */

buff[3] = '\0'; /* end buffer */

return conv + 2;

}

}

}

luaL_argerror(L, 1,

lua_pushfstring(L, "invalid conversion specifier '%%%s'", conv));

return conv; /* to avoid warnings */

}

static int os_date (lua_State *L) {

const char *s = luaL_optstring(L, 1, "%c");

time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));

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? */

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 cc[4];

luaL_Buffer b;

cc[0] = '%';

luaL_buffinit(L, &b);

while (*s) {

if (*s != '%') /* no conversion specifier? */

luaL_addchar(&b, *s++);

else {

size_t reslen;

char buff[200]; /* should be big enough for any conversion result */

s = checkoption(L, s + 1, cc);

reslen = strftime(buff, sizeof(buff), cc, stm);

luaL_addlstring(&b, buff, 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);

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 = 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 = luaL_optint(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;

}