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path: root/lib/lua/src/LuaLib/lbaselib.c
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Diffstat (limited to 'lib/lua/src/LuaLib/lbaselib.c')
-rw-r--r--lib/lua/src/LuaLib/lbaselib.c1348
1 files changed, 674 insertions, 674 deletions
diff --git a/lib/lua/src/LuaLib/lbaselib.c b/lib/lua/src/LuaLib/lbaselib.c
index 9e7c18b..5a3245a 100644
--- a/lib/lua/src/LuaLib/lbaselib.c
+++ b/lib/lua/src/LuaLib/lbaselib.c
@@ -1,674 +1,674 @@
-/*
-** $Id: lbaselib.c,v 1.1 2003-11-06 11:56:07 pixel Exp $
-** Basic library
-** See Copyright Notice in lua.h
-*/
-
-
-
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lbaselib_c
-
-#include "lua.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).
-*/
-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, "`tostring' must return a string to `print'");
- if (i>1) fputs("\t", stdout);
- fputs(s, stdout);
- lua_pop(L, 1); /* pop result */
- }
- fputs("\n", stdout);
- 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);
- luaL_checkany(L, 1);
- if (!lua_isstring(L, 1) || level == 0)
- lua_pushvalue(L, 1); /* propagate error message without changes */
- else { /* 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) {
- if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
- else {
- lua_Debug ar;
- int level = luaL_optint(L, 1, 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 aux_getfenv (lua_State *L) {
- lua_getfenv(L, -1);
- lua_pushliteral(L, "__fenv");
- lua_rawget(L, -2);
- return !lua_isnil(L, -1);
-}
-
-
-static int luaB_getfenv (lua_State *L) {
- getfunc(L);
- if (!aux_getfenv(L)) /* __fenv not defined? */
- lua_pop(L, 1); /* remove it, to return real environment */
- return 1;
-}
-
-
-static int luaB_setfenv (lua_State *L) {
- luaL_checktype(L, 2, LUA_TTABLE);
- getfunc(L);
- if (aux_getfenv(L)) /* __fenv defined? */
- luaL_error(L, "`setfenv' cannot change a protected environment");
- else
- lua_pop(L, 2); /* remove __fenv and real environment table */
- lua_pushvalue(L, 2);
- if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0)
- lua_replace(L, LUA_GLOBALSINDEX);
- else if (lua_setfenv(L, -2) == 0)
- luaL_error(L, "`setfenv' cannot change environment of given function");
- return 0;
-}
-
-
-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_checktype(L, 1, LUA_TTABLE);
- luaL_checkany(L, 2);
- lua_rawget(L, 1);
- return 1;
-}
-
-static int luaB_rawset (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checkany(L, 2);
- luaL_checkany(L, 3);
- lua_rawset(L, 1);
- return 1;
-}
-
-
-static int luaB_gcinfo (lua_State *L) {
- lua_pushnumber(L, (lua_Number)lua_getgccount(L));
- lua_pushnumber(L, (lua_Number)lua_getgcthreshold(L));
- return 2;
-}
-
-
-static int luaB_collectgarbage (lua_State *L) {
- lua_setgcthreshold(L, luaL_optint(L, 1, 0));
- return 0;
-}
-
-
-static int luaB_type (lua_State *L) {
- luaL_checkany(L, 1);
- lua_pushstring(L, lua_typename(L, lua_type(L, 1)));
- return 1;
-}
-
-
-static int luaB_next (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- 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_checktype(L, 1, LUA_TTABLE);
- lua_pushliteral(L, "next");
- lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushnil(L); /* and initial value */
- return 3;
-}
-
-
-static int luaB_ipairs (lua_State *L) {
- lua_Number i = lua_tonumber(L, 2);
- luaL_checktype(L, 1, LUA_TTABLE);
- if (i == 0 && lua_isnone(L, 2)) { /* `for' start? */
- lua_pushliteral(L, "ipairs");
- lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushnumber(L, 0); /* and initial value */
- return 3;
- }
- else { /* `for' step */
- i++; /* next value */
- lua_pushnumber(L, i);
- lua_rawgeti(L, 1, (int)i);
- return (lua_isnil(L, -1)) ? 0 : 2;
- }
-}
-
-
-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);
- return load_aux(L, luaL_loadfile(L, fname));
-}
-
-
-static int luaB_dofile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- int status = luaL_loadfile(L, fname);
- if (status != 0) lua_error(L);
- lua_call(L, 0, LUA_MULTRET);
- return lua_gettop(L) - 1;
-}
-
-
-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!"));
- lua_settop(L, 1);
- return 1;
-}
-
-
-static int luaB_unpack (lua_State *L) {
- int n, i;
- luaL_checktype(L, 1, LUA_TTABLE);
- n = luaL_getn(L, 1);
- luaL_checkstack(L, n, "table too big to unpack");
- for (i=1; i<=n; i++) /* push arg[1...n] */
- lua_rawgeti(L, 1, i);
- return n;
-}
-
-
-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) {
- char buff[64];
- 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));
- return 1;
- case LUA_TSTRING:
- lua_pushvalue(L, 1);
- return 1;
- case LUA_TBOOLEAN:
- lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
- return 1;
- case LUA_TTABLE:
- sprintf(buff, "table: %p", lua_topointer(L, 1));
- break;
- case LUA_TFUNCTION:
- sprintf(buff, "function: %p", lua_topointer(L, 1));
- break;
- case LUA_TUSERDATA:
- case LUA_TLIGHTUSERDATA:
- sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
- break;
- case LUA_TTHREAD:
- sprintf(buff, "thread: %p", (void *)lua_tothread(L, 1));
- break;
- case LUA_TNIL:
- lua_pushliteral(L, "nil");
- return 1;
- }
- lua_pushstring(L, buff);
- 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;
-}
-
-
-/*
-** {======================================================
-** `require' function
-** =======================================================
-*/
-
-
-/* name of global that holds table with loaded packages */
-#define REQTAB "_LOADED"
-
-/* name of global that holds the search path for packages */
-#define LUA_PATH "LUA_PATH"
-
-#ifndef LUA_PATH_SEP
-#define LUA_PATH_SEP ';'
-#endif
-
-#ifndef LUA_PATH_MARK
-#define LUA_PATH_MARK '?'
-#endif
-
-#ifndef LUA_PATH_DEFAULT
-#define LUA_PATH_DEFAULT "?;?.lua"
-#endif
-
-
-static const char *getpath (lua_State *L) {
- const char *path;
- lua_getglobal(L, LUA_PATH); /* try global variable */
- path = lua_tostring(L, -1);
- lua_pop(L, 1);
- if (path) return path;
- path = getenv(LUA_PATH); /* else try environment variable */
- if (path) return path;
- return LUA_PATH_DEFAULT; /* else use default */
-}
-
-
-static const char *pushnextpath (lua_State *L, const char *path) {
- const char *l;
- if (*path == '\0') return NULL; /* no more paths */
- if (*path == LUA_PATH_SEP) path++; /* skip separator */
- l = strchr(path, LUA_PATH_SEP); /* find next separator */
- if (l == NULL) l = path+strlen(path);
- lua_pushlstring(L, path, l - path); /* directory name */
- return l;
-}
-
-
-static void pushcomposename (lua_State *L) {
- const char *path = lua_tostring(L, -1);
- const char *wild;
- int n = 1;
- while ((wild = strchr(path, LUA_PATH_MARK)) != NULL) {
- /* is there stack space for prefix, name, and eventual last sufix? */
- luaL_checkstack(L, 3, "too many marks in a path component");
- lua_pushlstring(L, path, wild - path); /* push prefix */
- lua_pushvalue(L, 1); /* push package name (in place of MARK) */
- path = wild + 1; /* continue after MARK */
- n += 2;
- }
- lua_pushstring(L, path); /* push last sufix (`n' already includes this) */
- lua_concat(L, n);
-}
-
-
-static int luaB_require (lua_State *L) {
- const char *path;
- int status = LUA_ERRFILE; /* not found (yet) */
- luaL_checkstring(L, 1);
- lua_settop(L, 1);
- lua_getglobal(L, REQTAB);
- if (!lua_istable(L, 2)) return luaL_error(L, "`" REQTAB "' is not a table");
- path = getpath(L);
- lua_pushvalue(L, 1); /* check package's name in book-keeping table */
- lua_rawget(L, 2);
- if (lua_toboolean(L, -1)) /* is it there? */
- return 1; /* package is already loaded; return its result */
- else { /* must load it */
- while (status == LUA_ERRFILE) {
- lua_settop(L, 3); /* reset stack position */
- if ((path = pushnextpath(L, path)) == NULL) break;
- pushcomposename(L);
- status = luaL_loadfile(L, lua_tostring(L, -1)); /* try to load it */
- }
- }
- switch (status) {
- case 0: {
- lua_getglobal(L, "_REQUIREDNAME"); /* save previous name */
- lua_insert(L, -2); /* put it below function */
- lua_pushvalue(L, 1);
- lua_setglobal(L, "_REQUIREDNAME"); /* set new name */
- lua_call(L, 0, 1); /* run loaded module */
- lua_insert(L, -2); /* put result below previous name */
- lua_setglobal(L, "_REQUIREDNAME"); /* reset to previous name */
- if (lua_isnil(L, -1)) { /* no/nil return? */
- lua_pushboolean(L, 1);
- lua_replace(L, -2); /* replace to true */
- }
- lua_pushvalue(L, 1);
- lua_pushvalue(L, -2);
- lua_rawset(L, 2); /* mark it as loaded */
- return 1; /* return value */
- }
- case LUA_ERRFILE: { /* file not found */
- return luaL_error(L, "could not load package `%s' from path `%s'",
- lua_tostring(L, 1), getpath(L));
- }
- default: {
- return luaL_error(L, "error loading package `%s' (%s)",
- lua_tostring(L, 1), lua_tostring(L, -1));
- }
- }
-}
-
-/* }====================================================== */
-
-
-static const luaL_reg base_funcs[] = {
- {"error", luaB_error},
- {"getmetatable", luaB_getmetatable},
- {"setmetatable", luaB_setmetatable},
- {"getfenv", luaB_getfenv},
- {"setfenv", luaB_setfenv},
- {"next", luaB_next},
- {"ipairs", luaB_ipairs},
- {"pairs", luaB_pairs},
- {"print", luaB_print},
- {"tonumber", luaB_tonumber},
- {"tostring", luaB_tostring},
- {"type", luaB_type},
- {"assert", luaB_assert},
- {"unpack", luaB_unpack},
- {"rawequal", luaB_rawequal},
- {"rawget", luaB_rawget},
- {"rawset", luaB_rawset},
- {"pcall", luaB_pcall},
- {"xpcall", luaB_xpcall},
- {"collectgarbage", luaB_collectgarbage},
- {"gcinfo", luaB_gcinfo},
- {"loadfile", luaB_loadfile},
- {"dofile", luaB_dofile},
- {"loadstring", luaB_loadstring},
- {"require", luaB_require},
- {NULL, NULL}
-};
-
-
-/*
-** {======================================================
-** Coroutine library
-** =======================================================
-*/
-
-static int auxresume (lua_State *L, lua_State *co, int narg) {
- int status;
- if (!lua_checkstack(co, narg))
- luaL_error(L, "too many arguments to resume");
- lua_xmove(L, co, narg);
- status = lua_resume(co, narg);
- if (status == 0) {
- int nres = lua_gettop(co);
- if (!lua_checkstack(L, nres))
- 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_costatus (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- luaL_argcheck(L, co, 1, "coroutine expected");
- if (L == co) lua_pushliteral(L, "running");
- else {
- lua_Debug ar;
- if (lua_getstack(co, 0, &ar) == 0 && lua_gettop(co) == 0)
- lua_pushliteral(L, "dead");
- else
- lua_pushliteral(L, "suspended");
- }
- return 1;
-}
-
-
-static const luaL_reg co_funcs[] = {
- {"create", luaB_cocreate},
- {"wrap", luaB_cowrap},
- {"resume", luaB_coresume},
- {"yield", luaB_yield},
- {"status", luaB_costatus},
- {NULL, NULL}
-};
-
-/* }====================================================== */
-
-
-
-static void base_open (lua_State *L) {
- lua_pushliteral(L, "_G");
- lua_pushvalue(L, LUA_GLOBALSINDEX);
- luaL_openlib(L, NULL, base_funcs, 0); /* open lib into global table */
- lua_pushliteral(L, "_VERSION");
- lua_pushliteral(L, LUA_VERSION);
- lua_rawset(L, -3); /* set global _VERSION */
- /* `newproxy' needs a weaktable as upvalue */
- lua_pushliteral(L, "newproxy");
- lua_newtable(L); /* new table `w' */
- lua_pushvalue(L, -1); /* `w' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "__mode");
- lua_pushliteral(L, "k");
- lua_rawset(L, -3); /* metatable(w).__mode = "k" */
- lua_pushcclosure(L, luaB_newproxy, 1);
- lua_rawset(L, -3); /* set global `newproxy' */
- lua_rawset(L, -1); /* set global _G */
-}
-
-
-LUALIB_API int luaopen_base (lua_State *L) {
- base_open(L);
- luaL_openlib(L, LUA_COLIBNAME, co_funcs, 0);
- lua_newtable(L);
- lua_setglobal(L, REQTAB);
- return 0;
-}
-
+/*
+** $Id: lbaselib.c,v 1.2 2003-12-11 16:53:32 pixel Exp $
+** Basic library
+** See Copyright Notice in lua.h
+*/
+
+
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define lbaselib_c
+
+#include "lua.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).
+*/
+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, "`tostring' must return a string to `print'");
+ if (i>1) fputs("\t", stdout);
+ fputs(s, stdout);
+ lua_pop(L, 1); /* pop result */
+ }
+ fputs("\n", stdout);
+ 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);
+ luaL_checkany(L, 1);
+ if (!lua_isstring(L, 1) || level == 0)
+ lua_pushvalue(L, 1); /* propagate error message without changes */
+ else { /* 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) {
+ if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
+ else {
+ lua_Debug ar;
+ int level = luaL_optint(L, 1, 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 aux_getfenv (lua_State *L) {
+ lua_getfenv(L, -1);
+ lua_pushliteral(L, "__fenv");
+ lua_rawget(L, -2);
+ return !lua_isnil(L, -1);
+}
+
+
+static int luaB_getfenv (lua_State *L) {
+ getfunc(L);
+ if (!aux_getfenv(L)) /* __fenv not defined? */
+ lua_pop(L, 1); /* remove it, to return real environment */
+ return 1;
+}
+
+
+static int luaB_setfenv (lua_State *L) {
+ luaL_checktype(L, 2, LUA_TTABLE);
+ getfunc(L);
+ if (aux_getfenv(L)) /* __fenv defined? */
+ luaL_error(L, "`setfenv' cannot change a protected environment");
+ else
+ lua_pop(L, 2); /* remove __fenv and real environment table */
+ lua_pushvalue(L, 2);
+ if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0)
+ lua_replace(L, LUA_GLOBALSINDEX);
+ else if (lua_setfenv(L, -2) == 0)
+ luaL_error(L, "`setfenv' cannot change environment of given function");
+ return 0;
+}
+
+
+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_checktype(L, 1, LUA_TTABLE);
+ luaL_checkany(L, 2);
+ lua_rawget(L, 1);
+ return 1;
+}
+
+static int luaB_rawset (lua_State *L) {
+ luaL_checktype(L, 1, LUA_TTABLE);
+ luaL_checkany(L, 2);
+ luaL_checkany(L, 3);
+ lua_rawset(L, 1);
+ return 1;
+}
+
+
+static int luaB_gcinfo (lua_State *L) {
+ lua_pushnumber(L, (lua_Number)lua_getgccount(L));
+ lua_pushnumber(L, (lua_Number)lua_getgcthreshold(L));
+ return 2;
+}
+
+
+static int luaB_collectgarbage (lua_State *L) {
+ lua_setgcthreshold(L, luaL_optint(L, 1, 0));
+ return 0;
+}
+
+
+static int luaB_type (lua_State *L) {
+ luaL_checkany(L, 1);
+ lua_pushstring(L, lua_typename(L, lua_type(L, 1)));
+ return 1;
+}
+
+
+static int luaB_next (lua_State *L) {
+ luaL_checktype(L, 1, LUA_TTABLE);
+ 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_checktype(L, 1, LUA_TTABLE);
+ lua_pushliteral(L, "next");
+ lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
+ lua_pushvalue(L, 1); /* state, */
+ lua_pushnil(L); /* and initial value */
+ return 3;
+}
+
+
+static int luaB_ipairs (lua_State *L) {
+ lua_Number i = lua_tonumber(L, 2);
+ luaL_checktype(L, 1, LUA_TTABLE);
+ if (i == 0 && lua_isnone(L, 2)) { /* `for' start? */
+ lua_pushliteral(L, "ipairs");
+ lua_rawget(L, LUA_GLOBALSINDEX); /* return generator, */
+ lua_pushvalue(L, 1); /* state, */
+ lua_pushnumber(L, 0); /* and initial value */
+ return 3;
+ }
+ else { /* `for' step */
+ i++; /* next value */
+ lua_pushnumber(L, i);
+ lua_rawgeti(L, 1, (int)i);
+ return (lua_isnil(L, -1)) ? 0 : 2;
+ }
+}
+
+
+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);
+ return load_aux(L, luaL_loadfile(L, fname));
+}
+
+
+static int luaB_dofile (lua_State *L) {
+ const char *fname = luaL_optstring(L, 1, NULL);
+ int status = luaL_loadfile(L, fname);
+ if (status != 0) lua_error(L);
+ lua_call(L, 0, LUA_MULTRET);
+ return lua_gettop(L) - 1;
+}
+
+
+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!"));
+ lua_settop(L, 1);
+ return 1;
+}
+
+
+static int luaB_unpack (lua_State *L) {
+ int n, i;
+ luaL_checktype(L, 1, LUA_TTABLE);
+ n = luaL_getn(L, 1);
+ luaL_checkstack(L, n, "table too big to unpack");
+ for (i=1; i<=n; i++) /* push arg[1...n] */
+ lua_rawgeti(L, 1, i);
+ return n;
+}
+
+
+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) {
+ char buff[64];
+ 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));
+ return 1;
+ case LUA_TSTRING:
+ lua_pushvalue(L, 1);
+ return 1;
+ case LUA_TBOOLEAN:
+ lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
+ return 1;
+ case LUA_TTABLE:
+ sprintf(buff, "table: %p", lua_topointer(L, 1));
+ break;
+ case LUA_TFUNCTION:
+ sprintf(buff, "function: %p", lua_topointer(L, 1));
+ break;
+ case LUA_TUSERDATA:
+ case LUA_TLIGHTUSERDATA:
+ sprintf(buff, "userdata: %p", lua_touserdata(L, 1));
+ break;
+ case LUA_TTHREAD:
+ sprintf(buff, "thread: %p", (void *)lua_tothread(L, 1));
+ break;
+ case LUA_TNIL:
+ lua_pushliteral(L, "nil");
+ return 1;
+ }
+ lua_pushstring(L, buff);
+ 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;
+}
+
+
+/*
+** {======================================================
+** `require' function
+** =======================================================
+*/
+
+
+/* name of global that holds table with loaded packages */
+#define REQTAB "_LOADED"
+
+/* name of global that holds the search path for packages */
+#define LUA_PATH "LUA_PATH"
+
+#ifndef LUA_PATH_SEP
+#define LUA_PATH_SEP ';'
+#endif
+
+#ifndef LUA_PATH_MARK
+#define LUA_PATH_MARK '?'
+#endif
+
+#ifndef LUA_PATH_DEFAULT
+#define LUA_PATH_DEFAULT "?;?.lua"
+#endif
+
+
+static const char *getpath (lua_State *L) {
+ const char *path;
+ lua_getglobal(L, LUA_PATH); /* try global variable */
+ path = lua_tostring(L, -1);
+ lua_pop(L, 1);
+ if (path) return path;
+ path = getenv(LUA_PATH); /* else try environment variable */
+ if (path) return path;
+ return LUA_PATH_DEFAULT; /* else use default */
+}
+
+
+static const char *pushnextpath (lua_State *L, const char *path) {
+ const char *l;
+ if (*path == '\0') return NULL; /* no more paths */
+ if (*path == LUA_PATH_SEP) path++; /* skip separator */
+ l = strchr(path, LUA_PATH_SEP); /* find next separator */
+ if (l == NULL) l = path+strlen(path);
+ lua_pushlstring(L, path, l - path); /* directory name */
+ return l;
+}
+
+
+static void pushcomposename (lua_State *L) {
+ const char *path = lua_tostring(L, -1);
+ const char *wild;
+ int n = 1;
+ while ((wild = strchr(path, LUA_PATH_MARK)) != NULL) {
+ /* is there stack space for prefix, name, and eventual last sufix? */
+ luaL_checkstack(L, 3, "too many marks in a path component");
+ lua_pushlstring(L, path, wild - path); /* push prefix */
+ lua_pushvalue(L, 1); /* push package name (in place of MARK) */
+ path = wild + 1; /* continue after MARK */
+ n += 2;
+ }
+ lua_pushstring(L, path); /* push last sufix (`n' already includes this) */
+ lua_concat(L, n);
+}
+
+
+static int luaB_require (lua_State *L) {
+ const char *path;
+ int status = LUA_ERRFILE; /* not found (yet) */
+ luaL_checkstring(L, 1);
+ lua_settop(L, 1);
+ lua_getglobal(L, REQTAB);
+ if (!lua_istable(L, 2)) return luaL_error(L, "`" REQTAB "' is not a table");
+ path = getpath(L);
+ lua_pushvalue(L, 1); /* check package's name in book-keeping table */
+ lua_rawget(L, 2);
+ if (lua_toboolean(L, -1)) /* is it there? */
+ return 1; /* package is already loaded; return its result */
+ else { /* must load it */
+ while (status == LUA_ERRFILE) {
+ lua_settop(L, 3); /* reset stack position */
+ if ((path = pushnextpath(L, path)) == NULL) break;
+ pushcomposename(L);
+ status = luaL_loadfile(L, lua_tostring(L, -1)); /* try to load it */
+ }
+ }
+ switch (status) {
+ case 0: {
+ lua_getglobal(L, "_REQUIREDNAME"); /* save previous name */
+ lua_insert(L, -2); /* put it below function */
+ lua_pushvalue(L, 1);
+ lua_setglobal(L, "_REQUIREDNAME"); /* set new name */
+ lua_call(L, 0, 1); /* run loaded module */
+ lua_insert(L, -2); /* put result below previous name */
+ lua_setglobal(L, "_REQUIREDNAME"); /* reset to previous name */
+ if (lua_isnil(L, -1)) { /* no/nil return? */
+ lua_pushboolean(L, 1);
+ lua_replace(L, -2); /* replace to true */
+ }
+ lua_pushvalue(L, 1);
+ lua_pushvalue(L, -2);
+ lua_rawset(L, 2); /* mark it as loaded */
+ return 1; /* return value */
+ }
+ case LUA_ERRFILE: { /* file not found */
+ return luaL_error(L, "could not load package `%s' from path `%s'",
+ lua_tostring(L, 1), getpath(L));
+ }
+ default: {
+ return luaL_error(L, "error loading package `%s' (%s)",
+ lua_tostring(L, 1), lua_tostring(L, -1));
+ }
+ }
+}
+
+/* }====================================================== */
+
+
+static const luaL_reg base_funcs[] = {
+ {"error", luaB_error},
+ {"getmetatable", luaB_getmetatable},
+ {"setmetatable", luaB_setmetatable},
+ {"getfenv", luaB_getfenv},
+ {"setfenv", luaB_setfenv},
+ {"next", luaB_next},
+ {"ipairs", luaB_ipairs},
+ {"pairs", luaB_pairs},
+ {"print", luaB_print},
+ {"tonumber", luaB_tonumber},
+ {"tostring", luaB_tostring},
+ {"type", luaB_type},
+ {"assert", luaB_assert},
+ {"unpack", luaB_unpack},
+ {"rawequal", luaB_rawequal},
+ {"rawget", luaB_rawget},
+ {"rawset", luaB_rawset},
+ {"pcall", luaB_pcall},
+ {"xpcall", luaB_xpcall},
+ {"collectgarbage", luaB_collectgarbage},
+ {"gcinfo", luaB_gcinfo},
+ {"loadfile", luaB_loadfile},
+ {"dofile", luaB_dofile},
+ {"loadstring", luaB_loadstring},
+ {"require", luaB_require},
+ {NULL, NULL}
+};
+
+
+/*
+** {======================================================
+** Coroutine library
+** =======================================================
+*/
+
+static int auxresume (lua_State *L, lua_State *co, int narg) {
+ int status;
+ if (!lua_checkstack(co, narg))
+ luaL_error(L, "too many arguments to resume");
+ lua_xmove(L, co, narg);
+ status = lua_resume(co, narg);
+ if (status == 0) {
+ int nres = lua_gettop(co);
+ if (!lua_checkstack(L, nres))
+ 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_costatus (lua_State *L) {
+ lua_State *co = lua_tothread(L, 1);
+ luaL_argcheck(L, co, 1, "coroutine expected");
+ if (L == co) lua_pushliteral(L, "running");
+ else {
+ lua_Debug ar;
+ if (lua_getstack(co, 0, &ar) == 0 && lua_gettop(co) == 0)
+ lua_pushliteral(L, "dead");
+ else
+ lua_pushliteral(L, "suspended");
+ }
+ return 1;
+}
+
+
+static const luaL_reg co_funcs[] = {
+ {"create", luaB_cocreate},
+ {"wrap", luaB_cowrap},
+ {"resume", luaB_coresume},
+ {"yield", luaB_yield},
+ {"status", luaB_costatus},
+ {NULL, NULL}
+};
+
+/* }====================================================== */
+
+
+
+static void base_open (lua_State *L) {
+ lua_pushliteral(L, "_G");
+ lua_pushvalue(L, LUA_GLOBALSINDEX);
+ luaL_openlib(L, NULL, base_funcs, 0); /* open lib into global table */
+ lua_pushliteral(L, "_VERSION");
+ lua_pushliteral(L, LUA_VERSION);
+ lua_rawset(L, -3); /* set global _VERSION */
+ /* `newproxy' needs a weaktable as upvalue */
+ lua_pushliteral(L, "newproxy");
+ lua_newtable(L); /* new table `w' */
+ lua_pushvalue(L, -1); /* `w' will be its own metatable */
+ lua_setmetatable(L, -2);
+ lua_pushliteral(L, "__mode");
+ lua_pushliteral(L, "k");
+ lua_rawset(L, -3); /* metatable(w).__mode = "k" */
+ lua_pushcclosure(L, luaB_newproxy, 1);
+ lua_rawset(L, -3); /* set global `newproxy' */
+ lua_rawset(L, -1); /* set global _G */
+}
+
+
+LUALIB_API int luaopen_base (lua_State *L) {
+ base_open(L);
+ luaL_openlib(L, LUA_COLIBNAME, co_funcs, 0);
+ lua_newtable(L);
+ lua_setglobal(L, REQTAB);
+ return 0;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 22:31:17 +0000