module/lua/lbaselib.c

   1 /*
   2 ** $Id: lbaselib.c,v 1.276.1.1 2013/04/12 18:48:47 roberto Exp $
   3 ** Basic library
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 /* The following built-in lua functions have been removed and are not available
   8  * for use in ZFS channel programs:
   9  *
  10  * dofile
  11  * loadfile
  12  * load
  13  * pcall
  14  * print
  15  * xpcall
  16  */
  17
  18
  19 #define lbaselib_c
  20 #define LUA_LIB
  21
  22 #include <sys/lua/lua.h>
  23
  24 #include <sys/lua/lauxlib.h>
  25 #include <sys/lua/lualib.h>
  26
  27 #define SPACECHARS      " \f\n\r\t\v"
  28
  29 static int luaB_tonumber (lua_State *L) {
  30   if (lua_isnoneornil(L, 2)) {  /* standard conversion */
  31     int isnum;
  32     lua_Number n = lua_tonumberx(L, 1, &isnum);
  33     if (isnum) {
  34       lua_pushnumber(L, n);
  35       return 1;
  36     }  /* else not a number; must be something */
  37     luaL_checkany(L, 1);
  38   }
  39   else {
  40     size_t l;
  41     const char *s = luaL_checklstring(L, 1, &l);
  42     const char *e = s + l;  /* end point for 's' */
  43     int base = luaL_checkint(L, 2);
  44     int neg = 0;
  45     luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
  46     s += strspn(s, SPACECHARS);  /* skip initial spaces */
  47     if (*s == '-') { s++; neg = 1; }  /* handle signal */
  48     else if (*s == '+') s++;
  49     if (isalnum((unsigned char)*s)) {
  50       lua_Number n = 0;
  51       do {
  52         int digit = (isdigit((unsigned char)*s)) ? *s - '0'
  53                        : toupper((unsigned char)*s) - 'A' + 10;
  54         if (digit >= base) break;  /* invalid numeral; force a fail */
  55         n = n * (lua_Number)base + (lua_Number)digit;
  56         s++;
  57       } while (isalnum((unsigned char)*s));
  58       s += strspn(s, SPACECHARS);  /* skip trailing spaces */
  59       if (s == e) {  /* no invalid trailing characters? */
  60         lua_pushnumber(L, (neg) ? -n : n);
  61         return 1;
  62       }  /* else not a number */
  63     }  /* else not a number */
  64   }
  65   lua_pushnil(L);  /* not a number */
  66   return 1;
  67 }
  68
  69
  70 static int luaB_error (lua_State *L) {
  71   int level = luaL_optint(L, 2, 1);
  72   lua_settop(L, 1);
  73   if (lua_isstring(L, 1) && level > 0) {  /* add extra information? */
  74     luaL_where(L, level);
  75     lua_pushvalue(L, 1);
  76     lua_concat(L, 2);
  77   }
  78   return lua_error(L);
  79 }
  80
  81
  82 static int luaB_getmetatable (lua_State *L) {
  83   luaL_checkany(L, 1);
  84   if (!lua_getmetatable(L, 1)) {
  85     lua_pushnil(L);
  86     return 1;  /* no metatable */
  87   }
  88   luaL_getmetafield(L, 1, "__metatable");
  89   return 1;  /* returns either __metatable field (if present) or metatable */
  90 }
  91
  92
  93 static int luaB_setmetatable (lua_State *L) {
  94   int t = lua_type(L, 2);
  95   luaL_checktype(L, 1, LUA_TTABLE);
  96   luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
  97                     "nil or table expected");
  98   if (luaL_getmetafield(L, 1, "__metatable"))
  99     return luaL_error(L, "cannot change a protected metatable");
 100   lua_settop(L, 2);
 101   lua_setmetatable(L, 1);
 102   return 1;
 103 }
 104
 105
 106 static int luaB_rawequal (lua_State *L) {
 107   luaL_checkany(L, 1);
 108   luaL_checkany(L, 2);
 109   lua_pushboolean(L, lua_rawequal(L, 1, 2));
 110   return 1;
 111 }
 112
 113
 114 static int luaB_rawlen (lua_State *L) {
 115   int t = lua_type(L, 1);
 116   luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
 117                    "table or string expected");
 118   lua_pushinteger(L, lua_rawlen(L, 1));
 119   return 1;
 120 }
 121
 122
 123 static int luaB_rawget (lua_State *L) {
 124   luaL_checktype(L, 1, LUA_TTABLE);
 125   luaL_checkany(L, 2);
 126   lua_settop(L, 2);
 127   lua_rawget(L, 1);
 128   return 1;
 129 }
 130
 131 static int luaB_rawset (lua_State *L) {
 132   luaL_checktype(L, 1, LUA_TTABLE);
 133   luaL_checkany(L, 2);
 134   luaL_checkany(L, 3);
 135   lua_settop(L, 3);
 136   lua_rawset(L, 1);
 137   return 1;
 138 }
 139
 140
 141 static int luaB_collectgarbage (lua_State *L) {
 142   static const char *const opts[] = {"stop", "restart", "collect",
 143     "count", "step", "setpause", "setstepmul",
 144     "setmajorinc", "isrunning", "generational", "incremental", NULL};
 145   static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
 146     LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
 147     LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
 148   int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
 149   int ex = luaL_optint(L, 2, 0);
 150   int res = lua_gc(L, o, ex);
 151   switch (o) {
 152     case LUA_GCCOUNT: {
 153       int b = lua_gc(L, LUA_GCCOUNTB, 0);
 154       lua_pushnumber(L, res + ((lua_Number)b/1024));
 155       lua_pushinteger(L, b);
 156       return 2;
 157     }
 158     case LUA_GCSTEP: case LUA_GCISRUNNING: {
 159       lua_pushboolean(L, res);
 160       return 1;
 161     }
 162     default: {
 163       lua_pushinteger(L, res);
 164       return 1;
 165     }
 166   }
 167 }
 168
 169
 170 static int luaB_type (lua_State *L) {
 171   luaL_checkany(L, 1);
 172   lua_pushstring(L, luaL_typename(L, 1));
 173   return 1;
 174 }
 175
 176
 177 static int pairsmeta (lua_State *L, const char *method, int iszero,
 178                       lua_CFunction iter) {
 179   if (!luaL_getmetafield(L, 1, method)) {  /* no metamethod? */
 180     luaL_checktype(L, 1, LUA_TTABLE);  /* argument must be a table */
 181     lua_pushcfunction(L, iter);  /* will return generator, */
 182     lua_pushvalue(L, 1);  /* state, */
 183     if (iszero) lua_pushinteger(L, 0);  /* and initial value */
 184     else lua_pushnil(L);
 185   }
 186   else {
 187     lua_pushvalue(L, 1);  /* argument 'self' to metamethod */
 188     lua_call(L, 1, 3);  /* get 3 values from metamethod */
 189   }
 190   return 3;
 191 }
 192
 193
 194 static int luaB_next (lua_State *L) {
 195   luaL_checktype(L, 1, LUA_TTABLE);
 196   lua_settop(L, 2);  /* create a 2nd argument if there isn't one */
 197   if (lua_next(L, 1))
 198     return 2;
 199   else {
 200     lua_pushnil(L);
 201     return 1;
 202   }
 203 }
 204
 205
 206 static int luaB_pairs (lua_State *L) {
 207   return pairsmeta(L, "__pairs", 0, luaB_next);
 208 }
 209
 210
 211 static int ipairsaux (lua_State *L) {
 212   int i = luaL_checkint(L, 2);
 213   luaL_checktype(L, 1, LUA_TTABLE);
 214   i++;  /* next value */
 215   lua_pushinteger(L, i);
 216   lua_rawgeti(L, 1, i);
 217   return (lua_isnil(L, -1)) ? 1 : 2;
 218 }
 219
 220
 221 static int luaB_ipairs (lua_State *L) {
 222   return pairsmeta(L, "__ipairs", 1, ipairsaux);
 223 }
 224
 225
 226 static int luaB_assert (lua_State *L) {
 227   if (!lua_toboolean(L, 1))
 228     return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
 229   return lua_gettop(L);
 230 }
 231
 232
 233 static int luaB_select (lua_State *L) {
 234   int n = lua_gettop(L);
 235   if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
 236     lua_pushinteger(L, n-1);
 237     return 1;
 238   }
 239   else {
 240     int i = luaL_checkint(L, 1);
 241     if (i < 0) i = n + i;
 242     else if (i > n) i = n;
 243     luaL_argcheck(L, 1 <= i, 1, "index out of range");
 244     return n - i;
 245   }
 246 }
 247
 248 static int luaB_tostring (lua_State *L) {
 249   luaL_checkany(L, 1);
 250   luaL_tolstring(L, 1, NULL);
 251   return 1;
 252 }
 253
 254 static const luaL_Reg base_funcs[] = {
 255   {"assert", luaB_assert},
 256   {"collectgarbage", luaB_collectgarbage},
 257   {"error", luaB_error},
 258   {"getmetatable", luaB_getmetatable},
 259   {"ipairs", luaB_ipairs},
 260 #if defined(LUA_COMPAT_LOADSTRING)
 261   {"loadstring", luaB_load},
 262 #endif
 263   {"next", luaB_next},
 264   {"pairs", luaB_pairs},
 265   {"rawequal", luaB_rawequal},
 266   {"rawlen", luaB_rawlen},
 267   {"rawget", luaB_rawget},
 268   {"rawset", luaB_rawset},
 269   {"select", luaB_select},
 270   {"setmetatable", luaB_setmetatable},
 271   {"tonumber", luaB_tonumber},
 272   {"tostring", luaB_tostring},
 273   {"type", luaB_type},
 274   {NULL, NULL}
 275 };
 276
 277
 278 LUAMOD_API int luaopen_base (lua_State *L) {
 279   /* set global _G */
 280   lua_pushglobaltable(L);
 281   lua_pushglobaltable(L);
 282   lua_setfield(L, -2, "_G");
 283   /* open lib into global table */
 284   luaL_setfuncs(L, base_funcs, 0);
 285   lua_pushliteral(L, LUA_VERSION);
 286   lua_setfield(L, -2, "_VERSION");  /* set global _VERSION */
 287   return 1;
 288 }
 289
 290 #if defined(_KERNEL)
 291
 292 EXPORT_SYMBOL(luaopen_base);
 293
 294 #endif