/src/middleware/lua/loslib.c

  1/*
  2** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $
  3** Standard Operating System library
  4** See Copyright Notice in lua.h
  5*/
  6
  7
  8#include <errno.h>
  9#include <locale.h>
 10#include <stdlib.h>
 11#include <string.h>
 12#include <time.h>
 13
 14#define loslib_c
 15#define LUA_LIB
 16
 17#include "lua.h"
 18
 19#include "lauxlib.h"
 20#include "lualib.h"
 21
 22
 23static int os_pushresult (lua_State *L, int i, const char *filename) {
 24  int en = errno;  /* calls to Lua API may change this value */
 25  if (i) {
 26    lua_pushboolean(L, 1);
 27    return 1;
 28  }
 29  else {
 30    lua_pushnil(L);
 31    lua_pushfstring(L, "%s: %s", filename, strerror(en));
 32    lua_pushinteger(L, en);
 33    return 3;
 34  }
 35}
 36
 37
 38static int os_execute (lua_State *L) {
 39  lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
 40  return 1;
 41}
 42
 43
 44static int os_remove (lua_State *L) {
 45  const char *filename = luaL_checkstring(L, 1);
 46  return os_pushresult(L, remove(filename) == 0, filename);
 47}
 48
 49
 50static int os_rename (lua_State *L) {
 51  const char *fromname = luaL_checkstring(L, 1);
 52  const char *toname = luaL_checkstring(L, 2);
 53  return os_pushresult(L, rename(fromname, toname) == 0, fromname);
 54}
 55
 56
 57static int os_tmpname (lua_State *L) {
 58  char buff[LUA_TMPNAMBUFSIZE];
 59  int err;
 60  lua_tmpnam(buff, err);
 61  if (err)
 62    return luaL_error(L, "unable to generate a unique filename");
 63  lua_pushstring(L, buff);
 64  return 1;
 65}
 66
 67
 68static int os_getenv (lua_State *L) {
 69  lua_pushstring(L, getenv(luaL_checkstring(L, 1)));  /* if NULL push nil */
 70  return 1;
 71}
 72
 73
 74static int os_clock (lua_State *L) {
 75  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
 76  return 1;
 77}
 78
 79
 80/*
 81** {======================================================
 82** Time/Date operations
 83** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
 84**   wday=%w+1, yday=%j, isdst=? }
 85** =======================================================
 86*/
 87
 88static void setfield (lua_State *L, const char *key, int value) {
 89  lua_pushinteger(L, value);
 90  lua_setfield(L, -2, key);
 91}
 92
 93static void setboolfield (lua_State *L, const char *key, int value) {
 94  if (value < 0)  /* undefined? */
 95    return;  /* does not set field */
 96  lua_pushboolean(L, value);
 97  lua_setfield(L, -2, key);
 98}
 99
100static int getboolfield (lua_State *L, const char *key) {
101  int res;
102  lua_getfield(L, -1, key);
103  res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
104  lua_pop(L, 1);
105  return res;
106}
107
108
109static int getfield (lua_State *L, const char *key, int d) {
110  int res;
111  lua_getfield(L, -1, key);
112  if (lua_isnumber(L, -1))
113    res = (int)lua_tointeger(L, -1);
114  else {
115    if (d < 0)
116      return luaL_error(L, "field " LUA_QS " missing in date table", key);
117    res = d;
118  }
119  lua_pop(L, 1);
120  return res;
121}
122
123
124static int os_date (lua_State *L) {
125  const char *s = luaL_optstring(L, 1, "%c");
126  time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
127  struct tm *stm;
128  if (*s == '!') {  /* UTC? */
129    stm = gmtime(&t);
130    s++;  /* skip `!' */
131  }
132  else
133    stm = localtime(&t);
134  if (stm == NULL)  /* invalid date? */
135    lua_pushnil(L);
136  else if (strcmp(s, "*t") == 0) {
137    lua_createtable(L, 0, 9);  /* 9 = number of fields */
138    setfield(L, "sec", stm->tm_sec);
139    setfield(L, "min", stm->tm_min);
140    setfield(L, "hour", stm->tm_hour);
141    setfield(L, "day", stm->tm_mday);
142    setfield(L, "month", stm->tm_mon+1);
143    setfield(L, "year", stm->tm_year+1900);
144    setfield(L, "wday", stm->tm_wday+1);
145    setfield(L, "yday", stm->tm_yday+1);
146    setboolfield(L, "isdst", stm->tm_isdst);
147  }
148  else {
149    char cc[3];
150    luaL_Buffer b;
151    cc[0] = '%'; cc[2] = '\0';
152    luaL_buffinit(L, &b);
153    for (; *s; s++) {
154      if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
155        luaL_addchar(&b, *s);
156      else {
157        size_t reslen;
158        char buff[200];  /* should be big enough for any conversion result */
159        cc[1] = *(++s);
160        reslen = strftime(buff, sizeof(buff), cc, stm);
161        luaL_addlstring(&b, buff, reslen);
162      }
163    }
164    luaL_pushresult(&b);
165  }
166  return 1;
167}
168
169
170static int os_time (lua_State *L) {
171  time_t t;
172  if (lua_isnoneornil(L, 1))  /* called without args? */
173    t = time(NULL);  /* get current time */
174  else {
175    struct tm ts;
176    luaL_checktype(L, 1, LUA_TTABLE);
177    lua_settop(L, 1);  /* make sure table is at the top */
178    ts.tm_sec = getfield(L, "sec", 0);
179    ts.tm_min = getfield(L, "min", 0);
180    ts.tm_hour = getfield(L, "hour", 12);
181    ts.tm_mday = getfield(L, "day", -1);
182    ts.tm_mon = getfield(L, "month", -1) - 1;
183    ts.tm_year = getfield(L, "year", -1) - 1900;
184    ts.tm_isdst = getboolfield(L, "isdst");
185    t = mktime(&ts);
186  }
187  if (t == (time_t)(-1))
188    lua_pushnil(L);
189  else
190    lua_pushnumber(L, (lua_Number)t);
191  return 1;
192}
193
194
195static int os_difftime (lua_State *L) {
196  lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
197                             (time_t)(luaL_optnumber(L, 2, 0))));
198  return 1;
199}
200
201/* }====================================================== */
202
203
204static int os_setlocale (lua_State *L) {
205  static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
206                      LC_NUMERIC, LC_TIME};
207  static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
208     "numeric", "time", NULL};
209  const char *l = luaL_optstring(L, 1, NULL);
210  int op = luaL_checkoption(L, 2, "all", catnames);
211  lua_pushstring(L, setlocale(cat[op], l));
212  return 1;
213}
214
215
216static int os_exit (lua_State *L) {
217  exit(luaL_optint(L, 1, EXIT_SUCCESS));
218}
219
220static const luaL_Reg syslib[] = {
221  {"clock",     os_clock},
222  {"date",      os_date},
223  {"difftime",  os_difftime},
224  {"execute",   os_execute},
225  {"exit",      os_exit},
226  {"getenv",    os_getenv},
227  {"remove",    os_remove},
228  {"rename",    os_rename},
229  {"setlocale", os_setlocale},
230  {"time",      os_time},
231  {"tmpname",   os_tmpname},
232  {NULL, NULL}
233};
234
235/* }====================================================== */
236
237
238
239LUALIB_API int luaopen_os (lua_State *L) {
240  luaL_register(L, LUA_OSLIBNAME, syslib);
241  return 1;
242}
243