apps/plugins/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 <stdlib.h>
  10 #include <string.h>
  11 #include <time.h>
  12
  13 #define loslib_c
  14 #define LUA_LIB
  15
  16 #include "lua.h"
  17
  18 #include "lauxlib.h"
  19 #include "lualib.h"
  20
  21
  22 static int os_pushresult (lua_State *L, int i, const char *filename) {
  23   int en = errno;  /* calls to Lua API may change this value */
  24   if (i) {
  25     lua_pushboolean(L, 1);
  26     return 1;
  27   }
  28   else {
  29     lua_pushnil(L);
  30     lua_pushfstring(L, "%s: %s", filename, strerror(en));
  31     lua_pushinteger(L, en);
  32     return 3;
  33   }
  34 }
  35
  36
  37 static int os_remove (lua_State *L) {
  38   const char *filename = luaL_checkstring(L, 1);
  39   return os_pushresult(L, rb->remove(filename) == 0, filename);
  40 }
  41
  42
  43 static int os_rename (lua_State *L) {
  44   const char *fromname = luaL_checkstring(L, 1);
  45   const char *toname = luaL_checkstring(L, 2);
  46   return os_pushresult(L, rb->rename(fromname, toname) == 0, fromname);
  47 }
  48
  49
  50 /*
  51 ** {======================================================
  52 ** Time/Date operations
  53 ** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
  54 **   wday=%w+1, yday=%j, isdst=? }
  55 ** =======================================================
  56 */
  57
  58 static void setfield (lua_State *L, const char *key, int value) {
  59   lua_pushinteger(L, value);
  60   lua_setfield(L, -2, key);
  61 }
  62
  63 static void setboolfield (lua_State *L, const char *key, int value) {
  64   if (value < 0)  /* undefined? */
  65     return;  /* does not set field */
  66   lua_pushboolean(L, value);
  67   lua_setfield(L, -2, key);
  68 }
  69
  70 #if CONFIG_RTC
  71 static int getboolfield (lua_State *L, const char *key) {
  72   int res;
  73   lua_getfield(L, -1, key);
  74   res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
  75   lua_pop(L, 1);
  76   return res;
  77 }
  78
  79
  80 static int getfield (lua_State *L, const char *key, int d) {
  81   int res;
  82   lua_getfield(L, -1, key);
  83   if (lua_isnumber(L, -1))
  84     res = (int)lua_tointeger(L, -1);
  85   else {
  86     if (d < 0)
  87       return luaL_error(L, "field " LUA_QS " missing in date table", key);
  88     res = d;
  89   }
  90   lua_pop(L, 1);
  91   return res;
  92 }
  93 #endif
  94
  95
  96 static int os_date (lua_State *L) {
  97   const char *s = luaL_optstring(L, 1, "%c");
  98   time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2,
  99 #if CONFIG_RTC
 100   rb->mktime(rb->get_time())
 101 #else
 102   0
 103 #endif
 104   );
 105   struct tm *stm;
 106   if (*s == '!')  /* UTC? */ /* Rockbox doesn't support timezones */
 107     s++;  /* skip `!' */
 108   stm = gmtime(&t);
 109   if (stm == NULL)  /* invalid date? */
 110     lua_pushnil(L);
 111   else if (strcmp(s, "*t") == 0) {
 112     lua_createtable(L, 0, 9);  /* 9 = number of fields */
 113     setfield(L, "sec", stm->tm_sec);
 114     setfield(L, "min", stm->tm_min);
 115     setfield(L, "hour", stm->tm_hour);
 116     setfield(L, "day", stm->tm_mday);
 117     setfield(L, "month", stm->tm_mon+1);
 118     setfield(L, "year", stm->tm_year+1900);
 119     setfield(L, "wday", stm->tm_wday+1);
 120     setfield(L, "yday", stm->tm_yday+1);
 121     setboolfield(L, "isdst", stm->tm_isdst);
 122   }
 123   else {
 124     char cc[3];
 125     luaL_Buffer b;
 126     cc[0] = '%'; cc[2] = '\0';
 127     luaL_buffinit(L, &b);
 128     for (; *s; s++) {
 129       if (*s != '%' || *(s + 1) == '\0')  /* no conversion specifier? */
 130         luaL_addchar(&b, *s);
 131       else {
 132         size_t reslen;
 133         char buff[200];  /* should be big enough for any conversion result */
 134         cc[1] = *(++s);
 135         reslen = strftime(buff, sizeof(buff), cc, stm);
 136         luaL_addlstring(&b, buff, reslen);
 137       }
 138     }
 139     luaL_pushresult(&b);
 140   }
 141   return 1;
 142 }
 143
 144 static int os_time (lua_State *L) {
 145   time_t t = -1;
 146 #if CONFIG_RTC
 147   if (lua_isnoneornil(L, 1))  /* called without args? */
 148     t = rb->mktime(rb->get_time());  /* get current time */
 149   else {
 150     struct tm ts;
 151     luaL_checktype(L, 1, LUA_TTABLE);
 152     lua_settop(L, 1);  /* make sure table is at the top */
 153     ts.tm_sec = getfield(L, "sec", 0);
 154     ts.tm_min = getfield(L, "min", 0);
 155     ts.tm_hour = getfield(L, "hour", 12);
 156     ts.tm_mday = getfield(L, "day", -1);
 157     ts.tm_mon = getfield(L, "month", -1) - 1;
 158     ts.tm_year = getfield(L, "year", -1) - 1900;
 159     ts.tm_isdst = getboolfield(L, "isdst");
 160     t = rb->mktime(&ts);
 161   }
 162 #endif
 163   if (t == (time_t)(-1))
 164     lua_pushnil(L);
 165   else
 166     lua_pushnumber(L, (lua_Number)t);
 167   return 1;
 168 }
 169
 170
 171 /* }====================================================== */
 172
 173
 174 static int os_exit (lua_State *L) {
 175   exit(luaL_optint(L, 1, EXIT_SUCCESS));
 176 }
 177
 178 static const luaL_Reg syslib[] = {
 179   //{"clock",     os_clock},
 180   {"date",      os_date},
 181   //{"difftime",  os_difftime},
 182   //{"execute",   os_execute},
 183   {"exit",      os_exit},
 184   //{"getenv",    os_getenv},
 185   {"remove",    os_remove},
 186   {"rename",    os_rename},
 187   //{"setlocale", os_setlocale},
 188   {"time",      os_time},
 189   //{"tmpname",   os_tmpname},
 190   {NULL, NULL}
 191 };
 192
 193 /* }====================================================== */
 194
 195
 196
 197 LUALIB_API int luaopen_os (lua_State *L) {
 198   luaL_register(L, LUA_OSLIBNAME, syslib);
 199   return 1;
 200 }
 201