1 /* BEGIN CSTYLED */ 2 /* 3 ** $Id: lbaselib.c,v 1.276.1.1 2013/04/12 18:48:47 roberto Exp $ 4 ** Basic library 5 ** See Copyright Notice in lua.h 6 */ 7 8 /* The following built-in lua functions have been removed and are not available 9 * for use in ZFS channel programs: 10 * 11 * dofile 12 * loadfile 13 * load 14 * pcall 15 * print 16 * xpcall 17 */ 18 19 20 #define lbaselib_c 21 #define LUA_LIB 22 23 #include <sys/lua/lua.h> 24 25 #include <sys/lua/lauxlib.h> 26 #include <sys/lua/lualib.h> 27 28 #define SPACECHARS " \f\n\r\t\v" 29 30 static int luaB_tonumber (lua_State *L) { 31 if (lua_isnoneornil(L, 2)) { /* standard conversion */ 32 int isnum; 33 lua_Number n = lua_tonumberx(L, 1, &isnum); 34 if (isnum) { 35 lua_pushnumber(L, n); 36 return 1; 37 } /* else not a number; must be something */ 38 luaL_checkany(L, 1); 39 } 40 else { 41 size_t l; 42 const char *s = luaL_checklstring(L, 1, &l); 43 const char *e = s + l; /* end point for 's' */ 44 int base = luaL_checkint(L, 2); 45 int neg = 0; 46 luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range"); 47 s += strspn(s, SPACECHARS); /* skip initial spaces */ 48 if (*s == '-') { s++; neg = 1; } /* handle signal */ 49 else if (*s == '+') s++; 50 if (isalnum((unsigned char)*s)) { 51 lua_Number n = 0; 52 do { 53 int digit = (isdigit((unsigned char)*s)) ? *s - '0' 54 : toupper((unsigned char)*s) - 'A' + 10; 55 if (digit >= base) break; /* invalid numeral; force a fail */ 56 n = n * (lua_Number)base + (lua_Number)digit; 57 s++; 58 } while (isalnum((unsigned char)*s)); 59 s += strspn(s, SPACECHARS); /* skip trailing spaces */ 60 if (s == e) { /* no invalid trailing characters? */ 61 lua_pushnumber(L, (neg) ? -n : n); 62 return 1; 63 } /* else not a number */ 64 } /* else not a number */ 65 } 66 lua_pushnil(L); /* not a number */ 67 return 1; 68 } 69 70 71 static int luaB_error (lua_State *L) { 72 int level = luaL_optint(L, 2, 1); 73 lua_settop(L, 1); 74 if (lua_isstring(L, 1) && level > 0) { /* add extra information? */ 75 luaL_where(L, level); 76 lua_pushvalue(L, 1); 77 lua_concat(L, 2); 78 } 79 return lua_error(L); 80 } 81 82 83 static int luaB_getmetatable (lua_State *L) { 84 luaL_checkany(L, 1); 85 if (!lua_getmetatable(L, 1)) { 86 lua_pushnil(L); 87 return 1; /* no metatable */ 88 } 89 luaL_getmetafield(L, 1, "__metatable"); 90 return 1; /* returns either __metatable field (if present) or metatable */ 91 } 92 93 94 static int luaB_setmetatable (lua_State *L) { 95 int t = lua_type(L, 2); 96 luaL_checktype(L, 1, LUA_TTABLE); 97 luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2, 98 "nil or table expected"); 99 if (luaL_getmetafield(L, 1, "__metatable")) 100 return luaL_error(L, "cannot change a protected metatable"); 101 lua_settop(L, 2); 102 lua_setmetatable(L, 1); 103 return 1; 104 } 105 106 107 static int luaB_rawequal (lua_State *L) { 108 luaL_checkany(L, 1); 109 luaL_checkany(L, 2); 110 lua_pushboolean(L, lua_rawequal(L, 1, 2)); 111 return 1; 112 } 113 114 115 static int luaB_rawlen (lua_State *L) { 116 int t = lua_type(L, 1); 117 luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1, 118 "table or string expected"); 119 lua_pushinteger(L, lua_rawlen(L, 1)); 120 return 1; 121 } 122 123 124 static int luaB_rawget (lua_State *L) { 125 luaL_checktype(L, 1, LUA_TTABLE); 126 luaL_checkany(L, 2); 127 lua_settop(L, 2); 128 lua_rawget(L, 1); 129 return 1; 130 } 131 132 static int luaB_rawset (lua_State *L) { 133 luaL_checktype(L, 1, LUA_TTABLE); 134 luaL_checkany(L, 2); 135 luaL_checkany(L, 3); 136 lua_settop(L, 3); 137 lua_rawset(L, 1); 138 return 1; 139 } 140 141 142 static int luaB_collectgarbage (lua_State *L) { 143 static const char *const opts[] = {"stop", "restart", "collect", 144 "count", "step", "setpause", "setstepmul", 145 "setmajorinc", "isrunning", "generational", "incremental", NULL}; 146 static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT, 147 LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL, 148 LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC}; 149 int o = optsnum[luaL_checkoption(L, 1, "collect", opts)]; 150 int ex = luaL_optint(L, 2, 0); 151 int res = lua_gc(L, o, ex); 152 switch (o) { 153 case LUA_GCCOUNT: { 154 int b = lua_gc(L, LUA_GCCOUNTB, 0); 155 lua_pushnumber(L, res + ((lua_Number)b/1024)); 156 lua_pushinteger(L, b); 157 return 2; 158 } 159 case LUA_GCSTEP: case LUA_GCISRUNNING: { 160 lua_pushboolean(L, res); 161 return 1; 162 } 163 default: { 164 lua_pushinteger(L, res); 165 return 1; 166 } 167 } 168 } 169 170 171 static int luaB_type (lua_State *L) { 172 luaL_checkany(L, 1); 173 lua_pushstring(L, luaL_typename(L, 1)); 174 return 1; 175 } 176 177 178 static int pairsmeta (lua_State *L, const char *method, int iszero, 179 lua_CFunction iter) { 180 if (!luaL_getmetafield(L, 1, method)) { /* no metamethod? */ 181 luaL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */ 182 lua_pushcfunction(L, iter); /* will return generator, */ 183 lua_pushvalue(L, 1); /* state, */ 184 if (iszero) lua_pushinteger(L, 0); /* and initial value */ 185 else lua_pushnil(L); 186 } 187 else { 188 lua_pushvalue(L, 1); /* argument 'self' to metamethod */ 189 lua_call(L, 1, 3); /* get 3 values from metamethod */ 190 } 191 return 3; 192 } 193 194 195 static int luaB_next (lua_State *L) { 196 luaL_checktype(L, 1, LUA_TTABLE); 197 lua_settop(L, 2); /* create a 2nd argument if there isn't one */ 198 if (lua_next(L, 1)) 199 return 2; 200 else { 201 lua_pushnil(L); 202 return 1; 203 } 204 } 205 206 207 static int luaB_pairs (lua_State *L) { 208 return pairsmeta(L, "__pairs", 0, luaB_next); 209 } 210 211 212 static int ipairsaux (lua_State *L) { 213 int i = luaL_checkint(L, 2); 214 luaL_checktype(L, 1, LUA_TTABLE); 215 i++; /* next value */ 216 lua_pushinteger(L, i); 217 lua_rawgeti(L, 1, i); 218 return (lua_isnil(L, -1)) ? 1 : 2; 219 } 220 221 222 static int luaB_ipairs (lua_State *L) { 223 return pairsmeta(L, "__ipairs", 1, ipairsaux); 224 } 225 226 227 static int luaB_assert (lua_State *L) { 228 if (!lua_toboolean(L, 1)) 229 return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!")); 230 return lua_gettop(L); 231 } 232 233 234 static int luaB_select (lua_State *L) { 235 int n = lua_gettop(L); 236 if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') { 237 lua_pushinteger(L, n-1); 238 return 1; 239 } 240 else { 241 int i = luaL_checkint(L, 1); 242 if (i < 0) i = n + i; 243 else if (i > n) i = n; 244 luaL_argcheck(L, 1 <= i, 1, "index out of range"); 245 return n - i; 246 } 247 } 248 249 static int luaB_tostring (lua_State *L) { 250 luaL_checkany(L, 1); 251 luaL_tolstring(L, 1, NULL); 252 return 1; 253 } 254 255 static const luaL_Reg base_funcs[] = { 256 {"assert", luaB_assert}, 257 {"collectgarbage", luaB_collectgarbage}, 258 {"error", luaB_error}, 259 {"getmetatable", luaB_getmetatable}, 260 {"ipairs", luaB_ipairs}, 261 #if defined(LUA_COMPAT_LOADSTRING) 262 {"loadstring", luaB_load}, 263 #endif 264 {"next", luaB_next}, 265 {"pairs", luaB_pairs}, 266 {"rawequal", luaB_rawequal}, 267 {"rawlen", luaB_rawlen}, 268 {"rawget", luaB_rawget}, 269 {"rawset", luaB_rawset}, 270 {"select", luaB_select}, 271 {"setmetatable", luaB_setmetatable}, 272 {"tonumber", luaB_tonumber}, 273 {"tostring", luaB_tostring}, 274 {"type", luaB_type}, 275 {NULL, NULL} 276 }; 277 278 279 LUAMOD_API int luaopen_base (lua_State *L) { 280 /* set global _G */ 281 lua_pushglobaltable(L); 282 lua_pushglobaltable(L); 283 lua_setfield(L, -2, "_G"); 284 /* open lib into global table */ 285 luaL_setfuncs(L, base_funcs, 0); 286 lua_pushliteral(L, LUA_VERSION); 287 lua_setfield(L, -2, "_VERSION"); /* set global _VERSION */ 288 return 1; 289 } 290 291 #if defined(_KERNEL) 292 293 EXPORT_SYMBOL(luaopen_base); 294 295 #endif 296 /* END CSTYLED */ 297