Subversion Repositories Kolibri OS

/*

** $Id: loslib.c,v 1.38 2011/11/30 12:35:05 roberto Exp $

** Standard Operating System library

** See Copyright Notice in lua.h

*/

#include 

#include 

#include 

#include 

#include 

#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     { "aAbBcCdDeFgGhHIjmMnprRStTuUVwWxXyYzZ%", "", \

                                "E", "cCxXyY",  \

                                "O", "deHImMSuUVwWy" }

#endif

#endif

/*

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

** uses mkstemp.

*/

#if defined(LUA_USE_MKSTEMP)

#include 

#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, 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, 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;

}