297 lines
7.2 KiB
C
297 lines
7.2 KiB
C
/* BEGIN CSTYLED */
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/*
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** $Id: lbaselib.c,v 1.276.1.1 2013/04/12 18:48:47 roberto Exp $
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** Basic library
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** See Copyright Notice in lua.h
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*/
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/* The following built-in lua functions have been removed and are not available
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* for use in ZFS channel programs:
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*
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* dofile
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* loadfile
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* load
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* pcall
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* print
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* xpcall
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*/
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#define lbaselib_c
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#define LUA_LIB
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#include <sys/lua/lua.h>
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#include <sys/lua/lauxlib.h>
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#include <sys/lua/lualib.h>
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#define SPACECHARS " \f\n\r\t\v"
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static int luaB_tonumber (lua_State *L) {
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if (lua_isnoneornil(L, 2)) { /* standard conversion */
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int isnum;
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lua_Number n = lua_tonumberx(L, 1, &isnum);
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if (isnum) {
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lua_pushnumber(L, n);
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return 1;
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} /* else not a number; must be something */
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luaL_checkany(L, 1);
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}
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else {
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size_t l;
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const char *s = luaL_checklstring(L, 1, &l);
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const char *e = s + l; /* end point for 's' */
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int base = luaL_checkint(L, 2);
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int neg = 0;
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luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
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s += strspn(s, SPACECHARS); /* skip initial spaces */
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if (*s == '-') { s++; neg = 1; } /* handle signal */
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else if (*s == '+') s++;
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if (isalnum((unsigned char)*s)) {
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lua_Number n = 0;
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do {
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int digit = (isdigit((unsigned char)*s)) ? *s - '0'
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: toupper((unsigned char)*s) - 'A' + 10;
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if (digit >= base) break; /* invalid numeral; force a fail */
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n = n * (lua_Number)base + (lua_Number)digit;
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s++;
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} while (isalnum((unsigned char)*s));
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s += strspn(s, SPACECHARS); /* skip trailing spaces */
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if (s == e) { /* no invalid trailing characters? */
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lua_pushnumber(L, (neg) ? -n : n);
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return 1;
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} /* else not a number */
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} /* else not a number */
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}
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lua_pushnil(L); /* not a number */
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return 1;
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}
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static int luaB_error (lua_State *L) {
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int level = luaL_optint(L, 2, 1);
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lua_settop(L, 1);
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if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
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luaL_where(L, level);
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lua_pushvalue(L, 1);
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lua_concat(L, 2);
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}
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return lua_error(L);
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}
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static int luaB_getmetatable (lua_State *L) {
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luaL_checkany(L, 1);
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if (!lua_getmetatable(L, 1)) {
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lua_pushnil(L);
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return 1; /* no metatable */
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}
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luaL_getmetafield(L, 1, "__metatable");
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return 1; /* returns either __metatable field (if present) or metatable */
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}
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static int luaB_setmetatable (lua_State *L) {
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int t = lua_type(L, 2);
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
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"nil or table expected");
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if (luaL_getmetafield(L, 1, "__metatable"))
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return luaL_error(L, "cannot change a protected metatable");
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lua_settop(L, 2);
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lua_setmetatable(L, 1);
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return 1;
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}
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static int luaB_rawequal (lua_State *L) {
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luaL_checkany(L, 1);
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luaL_checkany(L, 2);
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lua_pushboolean(L, lua_rawequal(L, 1, 2));
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return 1;
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}
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static int luaB_rawlen (lua_State *L) {
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int t = lua_type(L, 1);
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luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
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"table or string expected");
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lua_pushinteger(L, lua_rawlen(L, 1));
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return 1;
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}
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static int luaB_rawget (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_checkany(L, 2);
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lua_settop(L, 2);
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lua_rawget(L, 1);
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return 1;
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}
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static int luaB_rawset (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_checkany(L, 2);
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luaL_checkany(L, 3);
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lua_settop(L, 3);
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lua_rawset(L, 1);
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return 1;
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}
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static int luaB_collectgarbage (lua_State *L) {
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static const char *const opts[] = {"stop", "restart", "collect",
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"count", "step", "setpause", "setstepmul",
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"setmajorinc", "isrunning", "generational", "incremental", NULL};
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static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
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LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
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LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
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int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
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int ex = luaL_optint(L, 2, 0);
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int res = lua_gc(L, o, ex);
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switch (o) {
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case LUA_GCCOUNT: {
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int b = lua_gc(L, LUA_GCCOUNTB, 0);
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lua_pushnumber(L, res + ((lua_Number)b/1024));
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lua_pushinteger(L, b);
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return 2;
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}
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case LUA_GCSTEP: case LUA_GCISRUNNING: {
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lua_pushboolean(L, res);
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return 1;
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}
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default: {
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lua_pushinteger(L, res);
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return 1;
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}
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}
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}
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static int luaB_type (lua_State *L) {
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luaL_checkany(L, 1);
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lua_pushstring(L, luaL_typename(L, 1));
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return 1;
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}
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static int pairsmeta (lua_State *L, const char *method, int iszero,
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lua_CFunction iter) {
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if (!luaL_getmetafield(L, 1, method)) { /* no metamethod? */
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luaL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */
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lua_pushcfunction(L, iter); /* will return generator, */
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lua_pushvalue(L, 1); /* state, */
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if (iszero) lua_pushinteger(L, 0); /* and initial value */
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else lua_pushnil(L);
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}
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else {
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lua_pushvalue(L, 1); /* argument 'self' to metamethod */
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lua_call(L, 1, 3); /* get 3 values from metamethod */
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}
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return 3;
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}
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static int luaB_next (lua_State *L) {
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luaL_checktype(L, 1, LUA_TTABLE);
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lua_settop(L, 2); /* create a 2nd argument if there isn't one */
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if (lua_next(L, 1))
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return 2;
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else {
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lua_pushnil(L);
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return 1;
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}
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}
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static int luaB_pairs (lua_State *L) {
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return pairsmeta(L, "__pairs", 0, luaB_next);
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}
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static int ipairsaux (lua_State *L) {
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int i = luaL_checkint(L, 2);
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luaL_checktype(L, 1, LUA_TTABLE);
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i++; /* next value */
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lua_pushinteger(L, i);
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lua_rawgeti(L, 1, i);
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return (lua_isnil(L, -1)) ? 1 : 2;
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}
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static int luaB_ipairs (lua_State *L) {
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return pairsmeta(L, "__ipairs", 1, ipairsaux);
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}
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static int luaB_assert (lua_State *L) {
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if (!lua_toboolean(L, 1))
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return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
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return lua_gettop(L);
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}
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static int luaB_select (lua_State *L) {
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int n = lua_gettop(L);
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if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
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lua_pushinteger(L, n-1);
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return 1;
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}
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else {
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int i = luaL_checkint(L, 1);
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if (i < 0) i = n + i;
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else if (i > n) i = n;
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luaL_argcheck(L, 1 <= i, 1, "index out of range");
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return n - i;
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}
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}
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static int luaB_tostring (lua_State *L) {
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luaL_checkany(L, 1);
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luaL_tolstring(L, 1, NULL);
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return 1;
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}
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static const luaL_Reg base_funcs[] = {
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{"assert", luaB_assert},
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{"collectgarbage", luaB_collectgarbage},
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{"error", luaB_error},
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{"getmetatable", luaB_getmetatable},
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{"ipairs", luaB_ipairs},
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#if defined(LUA_COMPAT_LOADSTRING)
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{"loadstring", luaB_load},
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#endif
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{"next", luaB_next},
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{"pairs", luaB_pairs},
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{"rawequal", luaB_rawequal},
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{"rawlen", luaB_rawlen},
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{"rawget", luaB_rawget},
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{"rawset", luaB_rawset},
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{"select", luaB_select},
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{"setmetatable", luaB_setmetatable},
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{"tonumber", luaB_tonumber},
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{"tostring", luaB_tostring},
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{"type", luaB_type},
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{NULL, NULL}
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};
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LUAMOD_API int luaopen_base (lua_State *L) {
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/* set global _G */
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lua_pushglobaltable(L);
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lua_pushglobaltable(L);
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lua_setfield(L, -2, "_G");
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/* open lib into global table */
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luaL_setfuncs(L, base_funcs, 0);
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lua_pushliteral(L, LUA_VERSION);
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lua_setfield(L, -2, "_VERSION"); /* set global _VERSION */
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return 1;
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}
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#if defined(_KERNEL)
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EXPORT_SYMBOL(luaopen_base);
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#endif
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/* END CSTYLED */
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