Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/module/lua/lbaselib.c
Version:
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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 - '' 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
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