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authorsfan5 <sfan5@live.de>2019-08-05 11:25:02 +0200
committersfan5 <sfan5@live.de>2019-08-05 22:48:13 +0200
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/*
** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 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);
    lua_pushfstring(L, "%s: %s", filename, 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;
}


/*