misc/liblua/loslib.c
author Wuzzy <Wuzzy2@mail.ru>
Wed, 29 Aug 2018 02:56:24 +0200
changeset 13719 9ea58d0134ad
parent 12872 0a18aaa0d329
permissions -rw-r--r--
Add missing server dependencies to Travis metadata
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/*
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** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $
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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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#if ((defined __MACH__) && (defined __APPLE__))
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  #include <TargetConditionals.h>
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  #if TARGET_OS_IPHONE
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    #define LUA_PLATFORM_IOS 1
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  #endif
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#endif
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#ifdef LUA_PLATFORM_IOS
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  #include <spawn.h>
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  extern char **environ;
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#endif
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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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  const char *command = luaL_optstring(L, 1, NULL);
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  int status;
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#ifndef LUA_PLATFORM_IOS
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  status = system(command);
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#else
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  // untested, may require adjustments depending on `command`
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  pid_t pid;
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  char *argv[] = { (char *)command, NULL };
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  posix_spawn(&pid, argv[0], NULL, NULL, argv, environ);
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  waitpid(pid, &status, 0);
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#endif
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  lua_pushinteger(L, status);
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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] = '%'; cc[2] = '\0';
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    luaL_buffinit(L, &b);
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    for (; *s; s++) {
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      if (*s != '%' || *(s + 1) == '\0')  /* 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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        char buff[200];  /* should be big enough for any conversion result */
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        cc[1] = *(++s);
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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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  exit(luaL_optint(L, 1, EXIT_SUCCESS));
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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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