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- /*
- ** $Id: lbaselib.c,v 1.191.1.6 2008/02/14 16:46:22 roberto Exp $
- ** Basic library
- ** See Copyright Notice in lua.h
- */
- #define lbaselib_c
- #define LUA_LIB
- #include "lua.h"
- #include <stdio.h>
- #include <string.h>
- #include <stdlib.h>
- #include "lauxlib.h"
- #include "lualib.h"
- /*
- ** If your system does not support `stdout', you can just remove this function.
- ** If you need, you can define your own `print' function, following this
- ** model but changing `fputs' to put the strings at a proper place
- ** (a console window or a log file, for instance).
- */
- #ifdef LUA_CROSS_COMPILER
- #undef puts
- #define puts(s) printf("%s",s)
- #endif
- static int luaB_print (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- int i;
- lua_getglobal(L, "tostring");
- for (i=1; i<=n; i++) {
- const char *s;
- lua_pushvalue(L, -1); /* function to be called */
- lua_pushvalue(L, i); /* value to print */
- lua_call(L, 1, 1);
- s = lua_tostring(L, -1); /* get result */
- if (s == NULL)
- return luaL_error(L, LUA_QL("tostring") " must return a string to "
- LUA_QL("print"));
- if (i>1) puts("\t");
- puts(s);
- lua_pop(L, 1); /* pop result */
- }
- puts("\n");
- return 0;
- }
- static int luaB_tonumber (lua_State *L) {
- int base = luaL_optint(L, 2, 10);
- if (base == 10) { /* standard conversion */
- luaL_checkany(L, 1);
- if (lua_isnumber(L, 1)) {
- lua_pushnumber(L, lua_tonumber(L, 1));
- return 1;
- }
- }
- else {
- const char *s1 = luaL_checkstring(L, 1);
- char *s2;
- unsigned long n;
- luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
- n = strtoul(s1, &s2, base);
- if (s1 != s2) { /* at least one valid digit? */
- while (isspace((unsigned char)(*s2))) s2++; /* skip trailing spaces */
- if (*s2 == '\0') { /* no invalid trailing characters? */
- lua_pushnumber(L, (lua_Number)n);
- return 1;
- }
- }
- }
- lua_pushnil(L); /* else not a number */
- return 1;
- }
- static int luaB_error (lua_State *L) {
- int level = luaL_optint(L, 2, 1);
- lua_settop(L, 1);
- if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
- luaL_where(L, level);
- lua_pushvalue(L, 1);
- lua_concat(L, 2);
- }
- return lua_error(L);
- }
- static int luaB_getmetatable (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_getmetatable(L, 1)) {
- lua_pushnil(L);
- return 1; /* no metatable */
- }
- luaL_getmetafield(L, 1, "__metatable");
- return 1; /* returns either __metatable field (if present) or metatable */
- }
- static int luaB_setmetatable (lua_State *L) {
- int t = lua_type(L, 2);
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
- "nil or table expected");
- if (luaL_getmetafield(L, 1, "__metatable"))
- luaL_error(L, "cannot change a protected metatable");
- lua_settop(L, 2);
- lua_setmetatable(L, 1);
- return 1;
- }
- static void getfunc (lua_State *L, int opt) {
- if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
- else {
- lua_Debug ar;
- int level = opt ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1);
- luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
- if (lua_getstack(L, level, &ar) == 0)
- luaL_argerror(L, 1, "invalid level");
- lua_getinfo(L, "f", &ar);
- if (lua_isnil(L, -1))
- luaL_error(L, "no function environment for tail call at level %d",
- level);
- }
- }
- static int luaB_getfenv (lua_State *L) {
- getfunc(L, 1);
- if (lua_iscfunction(L, -1)) /* is a C function? */
- lua_pushvalue(L, LUA_GLOBALSINDEX); /* return the thread's global env. */
- else
- lua_getfenv(L, -1);
- return 1;
- }
- static int luaB_setfenv (lua_State *L) {
- luaL_checktype(L, 2, LUA_TTABLE);
- getfunc(L, 0);
- lua_pushvalue(L, 2);
- if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0) {
- /* change environment of current thread */
- lua_pushthread(L);
- lua_insert(L, -2);
- lua_setfenv(L, -2);
- return 0;
- }
- else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)
- luaL_error(L,
- LUA_QL("setfenv") " cannot change environment of given object");
- return 1;
- }
- static int luaB_rawequal (lua_State *L) {
- luaL_checkany(L, 1);
- luaL_checkany(L, 2);
- lua_pushboolean(L, lua_rawequal(L, 1, 2));
- return 1;
- }
- static int luaB_rawget (lua_State *L) {
- luaL_checktable(L, 1);
- luaL_checkany(L, 2);
- lua_settop(L, 2);
- lua_rawget(L, 1);
- return 1;
- }
- static int luaB_rawset (lua_State *L) {
- luaL_checktable(L, 1);
- luaL_checkany(L, 2);
- luaL_checkany(L, 3);
- lua_settop(L, 3);
- lua_rawset(L, 1);
- return 1;
- }
- static int luaB_gcinfo (lua_State *L) {
- lua_pushinteger(L, lua_getgccount(L));
- return 1;
- }
- static int luaB_collectgarbage (lua_State *L) {
- static const char *const opts[] = {"stop", "restart", "collect",
- "count", "step", "setpause", "setstepmul","setmemlimit","getmemlimit", NULL};
- static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
- LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
- LUA_GCSETMEMLIMIT,LUA_GCGETMEMLIMIT};
- int o = luaL_checkoption(L, 1, "collect", opts);
- int ex = luaL_optint(L, 2, 0);
- int res = lua_gc(L, optsnum[o], ex);
- switch (optsnum[o]) {
- case LUA_GCCOUNT: {
- int b = lua_gc(L, LUA_GCCOUNTB, 0);
- lua_pushnumber(L, res + ((lua_Number)b/1024));
- return 1;
- }
- case LUA_GCSTEP: {
- lua_pushboolean(L, res);
- return 1;
- }
- default: {
- lua_pushnumber(L, res);
- return 1;
- }
- }
- }
- static int luaB_type (lua_State *L) {
- luaL_checkany(L, 1);
- lua_pushstring(L, luaL_typename(L, 1));
- return 1;
- }
- static int luaB_next (lua_State *L) {
- luaL_checktable(L, 1);
- lua_settop(L, 2); /* create a 2nd argument if there isn't one */
- if (lua_next(L, 1))
- return 2;
- else {
- lua_pushnil(L);
- return 1;
- }
- }
- static int luaB_pairs (lua_State *L) {
- luaL_checktable(L, 1);
- lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushnil(L); /* and initial value */
- return 3;
- }
- static int ipairsaux (lua_State *L) {
- int i = luaL_checkint(L, 2);
- luaL_checktable(L, 1);
- i++; /* next value */
- lua_pushinteger(L, i);
- lua_rawgeti(L, 1, i);
- return (lua_isnil(L, -1)) ? 0 : 2;
- }
- static int luaB_ipairs (lua_State *L) {
- luaL_checktable(L, 1);
- lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushinteger(L, 0); /* and initial value */
- return 3;
- }
- static int load_aux (lua_State *L, int status) {
- if (status == 0) /* OK? */
- return 1;
- else {
- lua_pushnil(L);
- lua_insert(L, -2); /* put before error message */
- return 2; /* return nil plus error message */
- }
- }
- static int luaB_loadstring (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- const char *chunkname = luaL_optstring(L, 2, s);
- return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
- }
- static int luaB_loadfile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- #ifdef LUA_CROSS_COMPILER
- return load_aux(L, luaL_loadfile(L, fname));
- #else
- return load_aux(L, luaL_loadfile(L, fname));
- #endif
- }
- /*
- ** Reader for generic `load' function: `lua_load' uses the
- ** stack for internal stuff, so the reader cannot change the
- ** stack top. Instead, it keeps its resulting string in a
- ** reserved slot inside the stack.
- */
- static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
- (void)ud; /* to avoid warnings */
- if (L == NULL && size == NULL) // direct mode check, doesn't happen
- return NULL;
- luaL_checkstack(L, 2, "too many nested functions");
- lua_pushvalue(L, 1); /* get function */
- lua_call(L, 0, 1); /* call it */
- if (lua_isnil(L, -1)) {
- *size = 0;
- return NULL;
- }
- else if (lua_isstring(L, -1)) {
- lua_replace(L, 3); /* save string in a reserved stack slot */
- return lua_tolstring(L, 3, size);
- }
- else luaL_error(L, "reader function must return a string");
- return NULL; /* to avoid warnings */
- }
- static int luaB_load (lua_State *L) {
- int status;
- const char *cname = luaL_optstring(L, 2, "=(load)");
- luaL_checktype(L, 1, LUA_TFUNCTION);
- lua_settop(L, 3); /* function, eventual name, plus one reserved slot */
- status = lua_load(L, generic_reader, NULL, cname);
- return load_aux(L, status);
- }
- static int luaB_dofile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- int n = lua_gettop(L);
- #ifdef LUA_CROSS_COMPILER
- if (luaL_loadfile(L, fname) != 0) lua_error(L);
- #else
- if (luaL_loadfile(L, fname) != 0) lua_error(L);
- #endif
- lua_call(L, 0, LUA_MULTRET);
- return lua_gettop(L) - n;
- }
- static int luaB_assert (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_toboolean(L, 1))
- return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
- return lua_gettop(L);
- }
- static int luaB_unpack (lua_State *L) {
- int i, e, n;
- luaL_checktype(L, 1, LUA_TTABLE);
- i = luaL_optint(L, 2, 1);
- e = luaL_opt(L, luaL_checkint, 3, luaL_getn(L, 1));
- if (i > e) return 0; /* empty range */
- n = e - i + 1; /* number of elements */
- if (n <= 0 || !lua_checkstack(L, n)) /* n <= 0 means arith. overflow */
- return luaL_error(L, "too many results to unpack");
- lua_rawgeti(L, 1, i); /* push arg[i] (avoiding overflow problems) */
- while (i++ < e) /* push arg[i + 1...e] */
- lua_rawgeti(L, 1, i);
- return n;
- }
- static int luaB_select (lua_State *L) {
- int n = lua_gettop(L);
- if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
- lua_pushinteger(L, n-1);
- return 1;
- }
- else {
- int i = luaL_checkint(L, 1);
- if (i < 0) i = n + i;
- else if (i > n) i = n;
- luaL_argcheck(L, 1 <= i, 1, "index out of range");
- return n - i;
- }
- }
- static int luaB_pcall (lua_State *L) {
- int status;
- luaL_checkany(L, 1);
- status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
- lua_pushboolean(L, (status == 0));
- lua_insert(L, 1);
- return lua_gettop(L); /* return status + all results */
- }
- static int luaB_xpcall (lua_State *L) {
- int status;
- luaL_checkany(L, 2);
- lua_settop(L, 2);
- lua_insert(L, 1); /* put error function under function to be called */
- status = lua_pcall(L, 0, LUA_MULTRET, 1);
- lua_pushboolean(L, (status == 0));
- lua_replace(L, 1);
- return lua_gettop(L); /* return status + all results */
- }
- static int luaB_tostring (lua_State *L) {
- luaL_checkany(L, 1);
- if (luaL_callmeta(L, 1, "__tostring")) /* is there a metafield? */
- return 1; /* use its value */
- switch (lua_type(L, 1)) {
- case LUA_TNUMBER:
- lua_pushstring(L, lua_tostring(L, 1));
- break;
- case LUA_TSTRING:
- lua_pushvalue(L, 1);
- break;
- case LUA_TBOOLEAN:
- lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
- break;
- case LUA_TNIL:
- lua_pushliteral(L, "nil");
- break;
- default:
- lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1));
- break;
- }
- return 1;
- }
- static int luaB_newproxy (lua_State *L) {
- lua_settop(L, 1);
- lua_newuserdata(L, 0); /* create proxy */
- if (lua_toboolean(L, 1) == 0)
- return 1; /* no metatable */
- else if (lua_isboolean(L, 1)) {
- lua_newtable(L); /* create a new metatable `m' ... */
- lua_pushvalue(L, -1); /* ... and mark `m' as a valid metatable */
- lua_pushboolean(L, 1);
- lua_rawset(L, lua_upvalueindex(1)); /* weaktable[m] = true */
- }
- else {
- int validproxy = 0; /* to check if weaktable[metatable(u)] == true */
- if (lua_getmetatable(L, 1)) {
- lua_rawget(L, lua_upvalueindex(1));
- validproxy = lua_toboolean(L, -1);
- lua_pop(L, 1); /* remove value */
- }
- luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
- lua_getmetatable(L, 1); /* metatable is valid; get it */
- }
- lua_setmetatable(L, 2);
- return 1;
- }
- /*
- ** ESP builds use specific linker directives to marshal all the ROTable entries
- ** for the library modules including the base library into an entry vector in
- ** the PSECT ".lua_rotable" including the base library entries; this is bound
- ** into a ROTable in linit.c which then hooked into the __index metaentry for
- ** _G so that base library and ROM tables are directly resolved through _G.
- **
- ** The host-based luac.cross builds which must use a standard GNU link or
- ** MSVC so this linker-specfic assembly approach can't be used. In this case
- ** luaopen_base returns a base_func ROTable so a two cascade resolution. See
- ** description in init.c for further details.
- */
- #ifdef LUA_CROSS_COMPILER
- LROT_BEGIN(base_func, NULL, 0)
- #else
- LROT_ENTRIES_IN_SECTION(base_func, rotable)
- #endif
- LROT_FUNCENTRY(assert, luaB_assert)
- LROT_FUNCENTRY(collectgarbage, luaB_collectgarbage)
- LROT_FUNCENTRY(dofile, luaB_dofile)
- LROT_FUNCENTRY(error, luaB_error)
- LROT_FUNCENTRY(gcinfo, luaB_gcinfo)
- LROT_FUNCENTRY(getfenv, luaB_getfenv)
- LROT_FUNCENTRY(getmetatable, luaB_getmetatable)
- LROT_FUNCENTRY(loadfile, luaB_loadfile)
- LROT_FUNCENTRY(load, luaB_load)
- LROT_FUNCENTRY(loadstring, luaB_loadstring)
- LROT_FUNCENTRY(next, luaB_next)
- LROT_FUNCENTRY(pcall, luaB_pcall)
- LROT_FUNCENTRY(print, luaB_print)
- LROT_FUNCENTRY(rawequal, luaB_rawequal)
- LROT_FUNCENTRY(rawget, luaB_rawget)
- LROT_FUNCENTRY(rawset, luaB_rawset)
- LROT_FUNCENTRY(select, luaB_select)
- LROT_FUNCENTRY(setfenv, luaB_setfenv)
- LROT_FUNCENTRY(setmetatable, luaB_setmetatable)
- LROT_FUNCENTRY(tonumber, luaB_tonumber)
- LROT_FUNCENTRY(tostring, luaB_tostring)
- LROT_FUNCENTRY(type, luaB_type)
- LROT_FUNCENTRY(unpack, luaB_unpack)
- LROT_FUNCENTRY(xpcall, luaB_xpcall)
- #ifdef LUA_CROSS_COMPILER
- LROT_END(base_func, NULL, 0)
- #else
- LROT_BREAK(base_func)
- #endif
- /*
- ** {======================================================
- ** Coroutine library
- ** =======================================================
- */
- #define CO_RUN 0 /* running */
- #define CO_SUS 1 /* suspended */
- #define CO_NOR 2 /* 'normal' (it resumed another coroutine) */
- #define CO_DEAD 3
- static const char *const statnames[] =
- {"running", "suspended", "normal", "dead"};
- static int costatus (lua_State *L, lua_State *co) {
- if (L == co) return CO_RUN;
- switch (lua_status(co)) {
- case LUA_YIELD:
- return CO_SUS;
- case 0: {
- lua_Debug ar;
- if (lua_getstack(co, 0, &ar) > 0) /* does it have frames? */
- return CO_NOR; /* it is running */
- else if (lua_gettop(co) == 0)
- return CO_DEAD;
- else
- return CO_SUS; /* initial state */
- }
- default: /* some error occured */
- return CO_DEAD;
- }
- }
- static int luaB_costatus (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- luaL_argcheck(L, co, 1, "coroutine expected");
- lua_pushstring(L, statnames[costatus(L, co)]);
- return 1;
- }
- static int auxresume (lua_State *L, lua_State *co, int narg) {
- int status = costatus(L, co);
- if (!lua_checkstack(co, narg))
- luaL_error(L, "too many arguments to resume");
- if (status != CO_SUS) {
- lua_pushfstring(L, "cannot resume %s coroutine", statnames[status]);
- return -1; /* error flag */
- }
- lua_xmove(L, co, narg);
- lua_setlevel(L, co);
- status = lua_resume(co, narg);
- if (status == 0 || status == LUA_YIELD) {
- int nres = lua_gettop(co);
- if (!lua_checkstack(L, nres + 1))
- luaL_error(L, "too many results to resume");
- lua_xmove(co, L, nres); /* move yielded values */
- return nres;
- }
- else {
- lua_xmove(co, L, 1); /* move error message */
- return -1; /* error flag */
- }
- }
- static int luaB_coresume (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- int r;
- luaL_argcheck(L, co, 1, "coroutine expected");
- r = auxresume(L, co, lua_gettop(L) - 1);
- if (r < 0) {
- lua_pushboolean(L, 0);
- lua_insert(L, -2);
- return 2; /* return false + error message */
- }
- else {
- lua_pushboolean(L, 1);
- lua_insert(L, -(r + 1));
- return r + 1; /* return true + `resume' returns */
- }
- }
- static int luaB_auxwrap (lua_State *L) {
- lua_State *co = lua_tothread(L, lua_upvalueindex(1));
- int r = auxresume(L, co, lua_gettop(L));
- if (r < 0) {
- if (lua_isstring(L, -1)) { /* error object is a string? */
- luaL_where(L, 1); /* add extra info */
- lua_insert(L, -2);
- lua_concat(L, 2);
- }
- lua_error(L); /* propagate error */
- }
- return r;
- }
- static int luaB_cocreate (lua_State *L) {
- lua_State *NL = lua_newthread(L);
- luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
- "Lua function expected");
- lua_pushvalue(L, 1); /* move function to top */
- lua_xmove(L, NL, 1); /* move function from L to NL */
- return 1;
- }
- static int luaB_cowrap (lua_State *L) {
- luaB_cocreate(L);
- lua_pushcclosure(L, luaB_auxwrap, 1);
- return 1;
- }
- static int luaB_yield (lua_State *L) {
- return lua_yield(L, lua_gettop(L));
- }
- static int luaB_corunning (lua_State *L) {
- if (lua_pushthread(L))
- lua_pushnil(L); /* main thread is not a coroutine */
- return 1;
- }
- LROT_BEGIN(co_funcs, NULL, 0)
- LROT_FUNCENTRY( create, luaB_cocreate )
- LROT_FUNCENTRY( resume, luaB_coresume )
- LROT_FUNCENTRY( running, luaB_corunning )
- LROT_FUNCENTRY( status, luaB_costatus )
- LROT_FUNCENTRY( wrap, luaB_cowrap )
- LROT_FUNCENTRY( yield, luaB_yield )
- LROT_END(co_funcs, NULL, 0)
- /* }====================================================== */
- static void auxopen (lua_State *L, const char *name,
- lua_CFunction f, lua_CFunction u) {
- lua_pushcfunction(L, u);
- lua_pushcclosure(L, f, 1);
- lua_setglobal(L, name);
- }
- extern LROT_TABLE(rotables);
- LUALIB_API int luaopen_base (lua_State *L) {
- lua_pushvalue(L, LUA_GLOBALSINDEX);
- lua_settable(L, LUA_GLOBALSINDEX); /* set global _G */
- lua_pushliteral(L, LUA_VERSION);
- lua_setglobal(L, "_VERSION"); /* set global _VERSION */
- /* `ipairs' and `pairs' need auxliliary functions as upvalues */
- auxopen(L, "ipairs", luaB_ipairs, ipairsaux);
- auxopen(L, "pairs", luaB_pairs, luaB_next);
- /* `newproxy' needs a weaktable as upvalue */
- lua_createtable(L, 0, 1); /* new table `w' */
- lua_pushliteral(L, "kv");
- lua_setfield(L, -2, "__mode"); /* metatable(w).__mode = "kv" */
- lua_pushvalue(L, -1); /* `w' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushcclosure(L, luaB_newproxy, 1); /* Upval is table w */
- lua_setglobal(L, "newproxy"); /* set global `newproxy' */
- lua_pushrotable(L, LROT_TABLEREF(rotables));
- lua_setglobal(L, "__index");
- lua_pushvalue(L, LUA_GLOBALSINDEX); /* _G is its own metatable */
- lua_setmetatable(L, LUA_GLOBALSINDEX);
- return 0;
- }
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