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