loslib.c File Reference

#include <errno.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"

Go to the source code of this file.

Macros
#define	loslib_c
#define	LUA_LIB

Functions
static int	os_pushresult (lua_State *L, int i, const char *filename)
static int	os_execute (lua_State *L)
static int	os_remove (lua_State *L)
static int	os_rename (lua_State *L)
static int	os_tmpname (lua_State *L)
static int	os_getenv (lua_State *L)
static int	os_clock (lua_State *L)
static void	setfield (lua_State *L, const char *key, int value)
static void	setboolfield (lua_State *L, const char *key, int value)
static int	getboolfield (lua_State *L, const char *key)
static int	getfield (lua_State *L, const char *key, int d)
static int	os_date (lua_State *L)
static int	os_time (lua_State *L)
static int	os_difftime (lua_State *L)
static int	os_setlocale (lua_State *L)
static int	os_exit (lua_State *L)
LUALIB_API int	luaopen_os (lua_State *L)

Variables
static const luaL_Reg	syslib []

Macro Definition Documentation

loslib_c

#define loslib_c

Definition at line 14 of file lua-5.1.5/src/loslib.c.

LUA_LIB

#define LUA_LIB

Definition at line 15 of file lua-5.1.5/src/loslib.c.

Function Documentation

getboolfield()

static int getboolfield ( lua_State * L, const char * key )

static

Definition at line 100 of file lua-5.1.5/src/loslib.c.

                                                        {
  int res;
  lua_getfield(L, -1, key);
  res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
  lua_pop(L, 1);
  return res;
}

References lua_getfield(), lua_isnil, lua_pop, and lua_toboolean().

Referenced by os_time().

getfield()

static int getfield ( lua_State * L, const char * key, int d )

static

Definition at line 109 of file lua-5.1.5/src/loslib.c.

                                                           {
  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;
}

References lua_getfield(), lua_isnumber(), lua_pop, LUA_QS, lua_tointeger, and luaL_error().

Referenced by os_time().

luaopen_os()

LUALIB_API int luaopen_os

(

lua_State *

L

)

Definition at line 239 of file lua-5.1.5/src/loslib.c.

                                         {
  luaL_register(L, LUA_OSLIBNAME, syslib);
  return 1;
}

References LUA_OSLIBNAME, luaL_register(), and syslib.

os_clock()

static int os_clock ( lua_State * L )

static

Definition at line 74 of file lua-5.1.5/src/loslib.c.

                                   {
  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
  return 1;
}

References lua_pushnumber().

os_date()

static int os_date ( lua_State * L )

static

Definition at line 124 of file lua-5.1.5/src/loslib.c.

                                  {
  const char *s = luaL_optstring(L, 1, "%c");
  time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
  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 cc[3];
    luaL_Buffer b;
    cc[0] = '%'; cc[2] = '\0';
    luaL_buffinit(L, &b);
    for (; *s; s++) {
      if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
        luaL_addchar(&b, *s);
      else {
        size_t reslen;
        char buff[200];  /* should be big enough for any conversion result */
        cc[1] = *(++s);
        reslen = strftime(buff, sizeof(buff), cc, stm);
        luaL_addlstring(&b, buff, reslen);
      }
    }
    luaL_pushresult(&b);
  }
  return 1;
}

References lua_createtable(), lua_pushnil(), luaL_addchar, luaL_addlstring(), luaL_buffinit(), luaL_checknumber(), luaL_opt, luaL_optstring, luaL_pushresult(), NULL, s, setboolfield(), and setfield().

os_difftime()

static int os_difftime ( lua_State * L )

static

Definition at line 195 of file lua-5.1.5/src/loslib.c.

                                      {
  lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
                             (time_t)(luaL_optnumber(L, 2, 0))));
  return 1;
}

References lua_pushnumber(), luaL_checknumber(), and luaL_optnumber().

os_execute()

static int os_execute ( lua_State * L )

static

Definition at line 38 of file lua-5.1.5/src/loslib.c.

                                     {
  lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
  return 1;
}

References lua_pushinteger(), luaL_optstring, and NULL.

os_exit()

static int os_exit ( lua_State * L )

static

Definition at line 216 of file lua-5.1.5/src/loslib.c.

                                  {
  exit(luaL_optint(L, 1, EXIT_SUCCESS));
}

References luaL_optint.

os_getenv()

static int os_getenv ( lua_State * L )

static

Definition at line 68 of file lua-5.1.5/src/loslib.c.

                                    {
  lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
  return 1;
}

References lua_pushstring(), and luaL_checkstring.

os_pushresult()

static int os_pushresult ( lua_State * L, int i, const char * filename )

static

Definition at line 23 of file lua-5.1.5/src/loslib.c.

                                                                     {
  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;
  }
}

References lua_pushboolean(), lua_pushfstring(), lua_pushinteger(), and lua_pushnil().

Referenced by os_remove(), and os_rename().

os_remove()

static int os_remove ( lua_State * L )

static

Definition at line 44 of file lua-5.1.5/src/loslib.c.

                                    {
  const char *filename = luaL_checkstring(L, 1);
  return os_pushresult(L, remove(filename) == 0, filename);
}

References luaL_checkstring, and os_pushresult().

os_rename()

static int os_rename ( lua_State * L )

static

Definition at line 50 of file lua-5.1.5/src/loslib.c.

                                    {
  const char *fromname = luaL_checkstring(L, 1);
  const char *toname = luaL_checkstring(L, 2);
  return os_pushresult(L, rename(fromname, toname) == 0, fromname);
}

References luaL_checkstring, and os_pushresult().

os_setlocale()

static int os_setlocale ( lua_State * L )

static

Definition at line 204 of file lua-5.1.5/src/loslib.c.

                                       {
  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;
}

References lua_pushstring(), luaL_checkoption(), luaL_optstring, and NULL.

os_time()

static int os_time ( lua_State * L )

static

Definition at line 170 of file lua-5.1.5/src/loslib.c.

                                  {
  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;
}

References getboolfield(), getfield(), lua_isnoneornil, lua_pushnil(), lua_pushnumber(), lua_settop(), LUA_TTABLE, luaL_checktype(), and NULL.

os_tmpname()

static int os_tmpname ( lua_State * L )

static

Definition at line 57 of file lua-5.1.5/src/loslib.c.

                                     {
  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;
}

References lua_pushstring(), lua_tmpnam, LUA_TMPNAMBUFSIZE, and luaL_error().

setboolfield()

static void setboolfield ( lua_State * L, const char * key, int value )

static

Definition at line 93 of file lua-5.1.5/src/loslib.c.

                                                                    {
  if (value < 0)  /* undefined? */
    return;  /* does not set field */
  lua_pushboolean(L, value);
  lua_setfield(L, -2, key);
}

References lua_pushboolean(), lua_setfield(), and value.

Referenced by os_date().

setfield()

static void setfield ( lua_State * L, const char * key, int value )

static

Definition at line 88 of file lua-5.1.5/src/loslib.c.

                                                                {
  lua_pushinteger(L, value);
  lua_setfield(L, -2, key);
}

References lua_pushinteger(), lua_setfield(), and value.

Referenced by os_date().

Variable Documentation

syslib

const luaL_Reg syslib[]

static

Initial value:

= {
  {"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}
}

Definition at line 220 of file lua-5.1.5/src/loslib.c.

                                 {
  {"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}
};

Referenced by luaopen_os().