| /* |
| ** $Id: lbaselib.c,v 1.250 2010/09/07 19:38:36 roberto Exp roberto $ |
| ** Basic library |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #define lbaselib_c |
| #define LUA_LIB |
| |
| #include "lua.h" |
| |
| #include "lauxlib.h" |
| #include "lualib.h" |
| |
| |
| 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; |
| size_t l; |
| lua_pushvalue(L, -1); /* function to be called */ |
| lua_pushvalue(L, i); /* value to print */ |
| lua_call(L, 1, 1); |
| s = lua_tolstring(L, -1, &l); /* get result */ |
| if (s == NULL) |
| return luaL_error(L, LUA_QL("tostring") " must return a string to " |
| LUA_QL("print")); |
| if (i>1) luai_writestring("\t", 1); |
| luai_writestring(s, l); |
| lua_pop(L, 1); /* pop result */ |
| } |
| luai_writestring("\n", 1); |
| 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; |
| int neg = 0; |
| luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range"); |
| while (isspace((unsigned char)(*s1))) s1++; /* skip initial spaces */ |
| if (*s1 == '-') { s1++; neg = 1; } |
| 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, (neg) ? -(lua_Number)n : (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")) |
| return luaL_error(L, "cannot change a protected metatable"); |
| lua_settop(L, 2); |
| lua_setmetatable(L, 1); |
| return 1; |
| } |
| |
| |
| static int luaB_getfenv (lua_State *L) { |
| return luaL_error(L, "getfenv/setfenv deprecated"); |
| } |
| |
| #define luaB_setfenv luaB_getfenv |
| |
| |
| 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_settop(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_settop(L, 3); |
| lua_rawset(L, 1); |
| return 1; |
| } |
| |
| |
| static int luaB_collectgarbage (lua_State *L) { |
| static const char *const opts[] = {"stop", "restart", "collect", |
| "count", "step", "setpause", "setstepmul", |
| "setmajorinc", "isrunning", "gen", "inc", NULL}; |
| static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT, |
| LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL, |
| LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC}; |
| int o = optsnum[luaL_checkoption(L, 1, "collect", opts)]; |
| int ex = luaL_optint(L, 2, 0); |
| int res = lua_gc(L, o, ex); |
| switch (o) { |
| case LUA_GCCOUNT: { |
| int b = lua_gc(L, LUA_GCCOUNTB, 0); |
| lua_pushnumber(L, res + ((lua_Number)b/1024)); |
| lua_pushinteger(L, b); |
| return 2; |
| } |
| case LUA_GCSTEP: case LUA_GCISRUNNING: { |
| lua_pushboolean(L, res); |
| return 1; |
| } |
| default: { |
| lua_pushinteger(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 pairsmeta (lua_State *L, const char *method, int iszero, |
| lua_CFunction iter) { |
| if (!luaL_getmetafield(L, 1, method)) { /* no metamethod? */ |
| luaL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */ |
| lua_pushcfunction(L, iter); /* will return generator, */ |
| lua_pushvalue(L, 1); /* state, */ |
| if (iszero) lua_pushinteger(L, 0); /* and initial value */ |
| else lua_pushnil(L); |
| } |
| else { |
| lua_pushvalue(L, 1); /* argument 'self' to metamethod */ |
| lua_call(L, 1, 3); /* get 3 values from metamethod */ |
| } |
| return 3; |
| } |
| |
| |
| 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) { |
| return pairsmeta(L, "__pairs", 0, luaB_next); |
| } |
| |
| |
| static int ipairsaux (lua_State *L) { |
| int i = luaL_checkint(L, 2); |
| luaL_checktype(L, 1, LUA_TTABLE); |
| i++; /* next value */ |
| lua_pushinteger(L, i); |
| lua_rawgeti(L, 1, i); |
| return (lua_isnil(L, -1)) ? 1 : 2; |
| } |
| |
| |
| static int luaB_ipairs (lua_State *L) { |
| return pairsmeta(L, "__ipairs", 1, ipairsaux); |
| } |
| |
| |
| static int load_aux (lua_State *L, int status) { |
| if (status == LUA_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_loadfile (lua_State *L) { |
| const char *fname = luaL_optstring(L, 1, NULL); |
| return load_aux(L, luaL_loadfile(L, fname)); |
| } |
| |
| |
| /* |
| ** {====================================================== |
| ** Generic Read function |
| ** ======================================================= |
| */ |
| |
| static const char *checkrights (lua_State *L, const char *mode, const char *s) { |
| if (strchr(mode, 'b') == NULL && *s == LUA_SIGNATURE[0]) |
| return lua_pushstring(L, "attempt to load a binary chunk"); |
| if (strchr(mode, 't') == NULL && *s != LUA_SIGNATURE[0]) |
| return lua_pushstring(L, "attempt to load a text chunk"); |
| return NULL; /* chunk in allowed format */ |
| } |
| |
| |
| /* |
| ** reserves a slot, above all arguments, to hold a copy of the returned |
| ** string to avoid it being collected while parsed |
| */ |
| #define RESERVEDSLOT 4 |
| |
| |
| /* |
| ** 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. |
| */ |
| typedef struct { /* reader state */ |
| int f; /* position of reader function on stack */ |
| const char *mode; /* allowed modes (binary/text) */ |
| } Readstat; |
| |
| static const char *generic_reader (lua_State *L, void *ud, size_t *size) { |
| const char *s; |
| Readstat *stat = (Readstat *)ud; |
| luaL_checkstack(L, 2, "too many nested functions"); |
| lua_pushvalue(L, stat->f); /* get function */ |
| lua_call(L, 0, 1); /* call it */ |
| if (lua_isnil(L, -1)) { |
| *size = 0; |
| return NULL; |
| } |
| else if ((s = lua_tostring(L, -1)) != NULL) { |
| if (stat->mode != NULL) { /* first time? */ |
| s = checkrights(L, stat->mode, s); /* check mode */ |
| stat->mode = NULL; /* to avoid further checks */ |
| if (s) luaL_error(L, s); |
| } |
| lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */ |
| return lua_tolstring(L, RESERVEDSLOT, size); |
| } |
| else { |
| luaL_error(L, "reader function must return a string"); |
| return NULL; /* to avoid warnings */ |
| } |
| } |
| |
| |
| static int luaB_load_aux (lua_State *L, int farg) { |
| int status; |
| Readstat stat; |
| size_t l; |
| const char *s = lua_tolstring(L, farg, &l); |
| stat.mode = luaL_optstring(L, farg + 2, "bt"); |
| if (s != NULL) { /* loading a string? */ |
| const char *chunkname = luaL_optstring(L, farg + 1, s); |
| status = (checkrights(L, stat.mode, s) != NULL) |
| || luaL_loadbuffer(L, s, l, chunkname); |
| } |
| else { /* loading from a reader function */ |
| const char *chunkname = luaL_optstring(L, farg + 1, "=(load)"); |
| luaL_checktype(L, farg, LUA_TFUNCTION); |
| stat.f = farg; |
| lua_settop(L, RESERVEDSLOT); /* create reserved slot */ |
| status = lua_load(L, generic_reader, &stat, chunkname); |
| } |
| return load_aux(L, status); |
| } |
| |
| |
| static int luaB_load (lua_State *L) { |
| return luaB_load_aux(L, 1); |
| } |
| |
| |
| static int luaB_loadin (lua_State *L) { |
| int n; |
| luaL_checkany(L, 1); |
| n = luaB_load_aux(L, 2); |
| if (n == 1) { /* success? */ |
| lua_pushvalue(L, 1); /* environment for loaded function */ |
| if (lua_setupvalue(L, -2, 1) == NULL) |
| luaL_error(L, "loaded chunk does not have an upvalue"); |
| } |
| return n; |
| } |
| |
| |
| static int luaB_loadstring (lua_State *L) { |
| lua_settop(L, 2); |
| lua_pushliteral(L, "tb"); |
| return luaB_load(L); /* dostring(s, n) == load(s, n, "tb") */ |
| |
| } |
| /* }====================================================== */ |
| |
| |
| static int dofilecont (lua_State *L) { |
| return lua_gettop(L) - 1; |
| } |
| |
| |
| static int luaB_dofile (lua_State *L) { |
| const char *fname = luaL_optstring(L, 1, NULL); |
| lua_settop(L, 1); |
| if (luaL_loadfile(L, fname) != LUA_OK) lua_error(L); |
| lua_callk(L, 0, LUA_MULTRET, 0, dofilecont); |
| return dofilecont(L); |
| } |
| |
| |
| static int luaB_assert (lua_State *L) { |
| if (!lua_toboolean(L, 1)) |
| return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!")); |
| return lua_gettop(L); |
| } |
| |
| |
| 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 pcallcont (lua_State *L) { |
| int errfunc; /* call has an error function in bottom of the stack */ |
| int status = lua_getctx(L, &errfunc); |
| lua_assert(status != LUA_OK); |
| lua_pushboolean(L, (status == LUA_YIELD)); /* first result (status) */ |
| if (errfunc) /* came from xpcall? */ |
| lua_replace(L, 1); /* put first result in place of error function */ |
| else /* came from pcall */ |
| lua_insert(L, 1); /* open space for first result */ |
| return lua_gettop(L); |
| } |
| |
| |
| static int luaB_pcall (lua_State *L) { |
| int status; |
| luaL_checkany(L, 1); |
| status = lua_pcallk(L, lua_gettop(L) - 1, LUA_MULTRET, 0, 0, pcallcont); |
| luaL_checkstack(L, 1, NULL); |
| lua_pushboolean(L, (status == LUA_OK)); |
| lua_insert(L, 1); |
| return lua_gettop(L); /* return status + all results */ |
| } |
| |
| |
| static int luaB_xpcall (lua_State *L) { |
| int status; |
| int n = lua_gettop(L); |
| luaL_argcheck(L, n >= 2, 2, "value expected"); |
| lua_pushvalue(L, 1); /* exchange function... */ |
| lua_copy(L, 2, 1); /* ...and error handler */ |
| lua_replace(L, 2); |
| status = lua_pcallk(L, n - 2, LUA_MULTRET, 1, 1, pcallcont); |
| luaL_checkstack(L, 1, NULL); |
| lua_pushboolean(L, (status == LUA_OK)); |
| lua_replace(L, 1); |
| return lua_gettop(L); /* return status + all results */ |
| } |
| |
| |
| static int luaB_tostring (lua_State *L) { |
| luaL_checkany(L, 1); |
| luaL_tolstring(L, 1, NULL); |
| 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_createtable(L, 0, 1); /* create a new metatable `m' ... */ |
| lua_pushboolean(L, 1); |
| lua_setfield(L, -2, "__gc"); /* ... m.__gc = false (HACK!!)... */ |
| 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; |
| } |
| |
| |
| static const luaL_Reg base_funcs[] = { |
| {"assert", luaB_assert}, |
| {"collectgarbage", luaB_collectgarbage}, |
| {"dofile", luaB_dofile}, |
| {"error", luaB_error}, |
| {"getfenv", luaB_getfenv}, |
| {"getmetatable", luaB_getmetatable}, |
| {"ipairs", luaB_ipairs}, |
| {"loadfile", luaB_loadfile}, |
| {"load", luaB_load}, |
| {"loadin", luaB_loadin}, |
| {"loadstring", luaB_loadstring}, |
| {"next", luaB_next}, |
| {"pairs", luaB_pairs}, |
| {"pcall", luaB_pcall}, |
| {"print", luaB_print}, |
| {"rawequal", luaB_rawequal}, |
| {"rawget", luaB_rawget}, |
| {"rawset", luaB_rawset}, |
| {"select", luaB_select}, |
| {"setfenv", luaB_setfenv}, |
| {"setmetatable", luaB_setmetatable}, |
| {"tonumber", luaB_tonumber}, |
| {"tostring", luaB_tostring}, |
| {"type", luaB_type}, |
| {"xpcall", luaB_xpcall}, |
| {NULL, NULL} |
| }; |
| |
| |
| LUAMOD_API int luaopen_base (lua_State *L) { |
| /* set global _G */ |
| lua_pushglobaltable(L); |
| lua_pushglobaltable(L); |
| lua_setfield(L, -2, "_G"); |
| /* open lib into global table */ |
| luaL_setfuncs(L, base_funcs, 0); |
| lua_pushliteral(L, LUA_VERSION); |
| lua_setfield(L, -2, "_VERSION"); /* set global _VERSION */ |
| /* `newproxy' needs a weaktable as upvalue */ |
| lua_createtable(L, 0, 1); /* new table `w' */ |
| lua_pushvalue(L, -1); /* `w' will be its own metatable */ |
| lua_setmetatable(L, -2); |
| lua_pushliteral(L, "kv"); |
| lua_setfield(L, -2, "__mode"); /* metatable(w).__mode = "kv" */ |
| lua_pushcclosure(L, luaB_newproxy, 1); |
| lua_setfield(L, -2, "newproxy"); /* set global `newproxy' */ |
| return 1; |
| } |
| |