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-rw-r--r--lua-5.1.4/src/lapi.c1087
1 files changed, 1087 insertions, 0 deletions
diff --git a/lua-5.1.4/src/lapi.c b/lua-5.1.4/src/lapi.c
new file mode 100644
index 000000000..5d5145d2e
--- /dev/null
+++ b/lua-5.1.4/src/lapi.c
@@ -0,0 +1,1087 @@
+/*
+** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
+** Lua API
+** See Copyright Notice in lua.h
+*/
+
+
+#include <assert.h>
+#include <math.h>
+#include <stdarg.h>
+#include <string.h>
+
+#define lapi_c
+#define LUA_CORE
+
+#include "lua.h"
+
+#include "lapi.h"
+#include "ldebug.h"
+#include "ldo.h"
+#include "lfunc.h"
+#include "lgc.h"
+#include "lmem.h"
+#include "lobject.h"
+#include "lstate.h"
+#include "lstring.h"
+#include "ltable.h"
+#include "ltm.h"
+#include "lundump.h"
+#include "lvm.h"
+
+
+
+const char lua_ident[] =
+ "$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
+ "$Authors: " LUA_AUTHORS " $\n"
+ "$URL: www.lua.org $\n";
+
+
+
+#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
+
+#define api_checkvalidindex(L, i) api_check(L, (i) != luaO_nilobject)
+
+#define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
+
+
+
+static TValue *index2adr (lua_State *L, int idx) {
+ if (idx > 0) {
+ TValue *o = L->base + (idx - 1);
+ api_check(L, idx <= L->ci->top - L->base);
+ if (o >= L->top) return cast(TValue *, luaO_nilobject);
+ else return o;
+ }
+ else if (idx > LUA_REGISTRYINDEX) {
+ api_check(L, idx != 0 && -idx <= L->top - L->base);
+ return L->top + idx;
+ }
+ else switch (idx) { /* pseudo-indices */
+ case LUA_REGISTRYINDEX: return registry(L);
+ case LUA_ENVIRONINDEX: {
+ Closure *func = curr_func(L);
+ sethvalue(L, &L->env, func->c.env);
+ return &L->env;
+ }
+ case LUA_GLOBALSINDEX: return gt(L);
+ default: {
+ Closure *func = curr_func(L);
+ idx = LUA_GLOBALSINDEX - idx;
+ return (idx <= func->c.nupvalues)
+ ? &func->c.upvalue[idx-1]
+ : cast(TValue *, luaO_nilobject);
+ }
+ }
+}
+
+
+static Table *getcurrenv (lua_State *L) {
+ if (L->ci == L->base_ci) /* no enclosing function? */
+ return hvalue(gt(L)); /* use global table as environment */
+ else {
+ Closure *func = curr_func(L);
+ return func->c.env;
+ }
+}
+
+
+void luaA_pushobject (lua_State *L, const TValue *o) {
+ setobj2s(L, L->top, o);
+ api_incr_top(L);
+}
+
+
+LUA_API int lua_checkstack (lua_State *L, int size) {
+ int res = 1;
+ lua_lock(L);
+ if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
+ res = 0; /* stack overflow */
+ else if (size > 0) {
+ luaD_checkstack(L, size);
+ if (L->ci->top < L->top + size)
+ L->ci->top = L->top + size;
+ }
+ lua_unlock(L);
+ return res;
+}
+
+
+LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
+ int i;
+ if (from == to) return;
+ lua_lock(to);
+ api_checknelems(from, n);
+ api_check(from, G(from) == G(to));
+ api_check(from, to->ci->top - to->top >= n);
+ from->top -= n;
+ for (i = 0; i < n; i++) {
+ setobj2s(to, to->top++, from->top + i);
+ }
+ lua_unlock(to);
+}
+
+
+LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
+ to->nCcalls = from->nCcalls;
+}
+
+
+LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
+ lua_CFunction old;
+ lua_lock(L);
+ old = G(L)->panic;
+ G(L)->panic = panicf;
+ lua_unlock(L);
+ return old;
+}
+
+
+LUA_API lua_State *lua_newthread (lua_State *L) {
+ lua_State *L1;
+ lua_lock(L);
+ luaC_checkGC(L);
+ L1 = luaE_newthread(L);
+ setthvalue(L, L->top, L1);
+ api_incr_top(L);
+ lua_unlock(L);
+ luai_userstatethread(L, L1);
+ return L1;
+}
+
+
+
+/*
+** basic stack manipulation
+*/
+
+
+LUA_API int lua_gettop (lua_State *L) {
+ return cast_int(L->top - L->base);
+}
+
+
+LUA_API void lua_settop (lua_State *L, int idx) {
+ lua_lock(L);
+ if (idx >= 0) {
+ api_check(L, idx <= L->stack_last - L->base);
+ while (L->top < L->base + idx)
+ setnilvalue(L->top++);
+ L->top = L->base + idx;
+ }
+ else {
+ api_check(L, -(idx+1) <= (L->top - L->base));
+ L->top += idx+1; /* `subtract' index (index is negative) */
+ }
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_remove (lua_State *L, int idx) {
+ StkId p;
+ lua_lock(L);
+ p = index2adr(L, idx);
+ api_checkvalidindex(L, p);
+ while (++p < L->top) setobjs2s(L, p-1, p);
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_insert (lua_State *L, int idx) {
+ StkId p;
+ StkId q;
+ lua_lock(L);
+ p = index2adr(L, idx);
+ api_checkvalidindex(L, p);
+ for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
+ setobjs2s(L, p, L->top);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_replace (lua_State *L, int idx) {
+ StkId o;
+ lua_lock(L);
+ /* explicit test for incompatible code */
+ if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
+ luaG_runerror(L, "no calling environment");
+ api_checknelems(L, 1);
+ o = index2adr(L, idx);
+ api_checkvalidindex(L, o);
+ if (idx == LUA_ENVIRONINDEX) {
+ Closure *func = curr_func(L);
+ api_check(L, ttistable(L->top - 1));
+ func->c.env = hvalue(L->top - 1);
+ luaC_barrier(L, func, L->top - 1);
+ }
+ else {
+ setobj(L, o, L->top - 1);
+ if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
+ luaC_barrier(L, curr_func(L), L->top - 1);
+ }
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushvalue (lua_State *L, int idx) {
+ lua_lock(L);
+ setobj2s(L, L->top, index2adr(L, idx));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+
+/*
+** access functions (stack -> C)
+*/
+
+
+LUA_API int lua_type (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
+}
+
+
+LUA_API const char *lua_typename (lua_State *L, int t) {
+ UNUSED(L);
+ return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
+}
+
+
+LUA_API int lua_iscfunction (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ return iscfunction(o);
+}
+
+
+LUA_API int lua_isnumber (lua_State *L, int idx) {
+ TValue n;
+ const TValue *o = index2adr(L, idx);
+ return tonumber(o, &n);
+}
+
+
+LUA_API int lua_isstring (lua_State *L, int idx) {
+ int t = lua_type(L, idx);
+ return (t == LUA_TSTRING || t == LUA_TNUMBER);
+}
+
+
+LUA_API int lua_isuserdata (lua_State *L, int idx) {
+ const TValue *o = index2adr(L, idx);
+ return (ttisuserdata(o) || ttislightuserdata(o));
+}
+
+
+LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
+ StkId o1 = index2adr(L, index1);
+ StkId o2 = index2adr(L, index2);
+ return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
+ : luaO_rawequalObj(o1, o2);
+}
+
+
+LUA_API int lua_equal (lua_State *L, int index1, int index2) {
+ StkId o1, o2;
+ int i;
+ lua_lock(L); /* may call tag method */
+ o1 = index2adr(L, index1);
+ o2 = index2adr(L, index2);
+ i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
+ lua_unlock(L);
+ return i;
+}
+
+
+LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
+ StkId o1, o2;
+ int i;
+ lua_lock(L); /* may call tag method */
+ o1 = index2adr(L, index1);
+ o2 = index2adr(L, index2);
+ i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
+ : luaV_lessthan(L, o1, o2);
+ lua_unlock(L);
+ return i;
+}
+
+
+
+LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
+ TValue n;
+ const TValue *o = index2adr(L, idx);
+ if (tonumber(o, &n))
+ return nvalue(o);
+ else
+ return 0;
+}
+
+
+LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
+ TValue n;
+ const TValue *o = index2adr(L, idx);
+ if (tonumber(o, &n)) {
+ lua_Integer res;
+ lua_Number num = nvalue(o);
+ lua_number2integer(res, num);
+ return res;
+ }
+ else
+ return 0;
+}
+
+
+LUA_API int lua_toboolean (lua_State *L, int idx) {
+ const TValue *o = index2adr(L, idx);
+ return !l_isfalse(o);
+}
+
+
+LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
+ StkId o = index2adr(L, idx);
+ if (!ttisstring(o)) {
+ lua_lock(L); /* `luaV_tostring' may create a new string */
+ if (!luaV_tostring(L, o)) { /* conversion failed? */
+ if (len != NULL) *len = 0;
+ lua_unlock(L);
+ return NULL;
+ }
+ luaC_checkGC(L);
+ o = index2adr(L, idx); /* previous call may reallocate the stack */
+ lua_unlock(L);
+ }
+ if (len != NULL) *len = tsvalue(o)->len;
+ return svalue(o);
+}
+
+
+LUA_API size_t lua_objlen (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ switch (ttype(o)) {
+ case LUA_TSTRING: return tsvalue(o)->len;
+ case LUA_TUSERDATA: return uvalue(o)->len;
+ case LUA_TTABLE: return luaH_getn(hvalue(o));
+ case LUA_TNUMBER: {
+ size_t l;
+ lua_lock(L); /* `luaV_tostring' may create a new string */
+ l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
+ lua_unlock(L);
+ return l;
+ }
+ default: return 0;
+ }
+}
+
+
+LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
+}
+
+
+LUA_API void *lua_touserdata (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ switch (ttype(o)) {
+ case LUA_TUSERDATA: return (rawuvalue(o) + 1);
+ case LUA_TLIGHTUSERDATA: return pvalue(o);
+ default: return NULL;
+ }
+}
+
+
+LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ return (!ttisthread(o)) ? NULL : thvalue(o);
+}
+
+
+LUA_API const void *lua_topointer (lua_State *L, int idx) {
+ StkId o = index2adr(L, idx);
+ switch (ttype(o)) {
+ case LUA_TTABLE: return hvalue(o);
+ case LUA_TFUNCTION: return clvalue(o);
+ case LUA_TTHREAD: return thvalue(o);
+ case LUA_TUSERDATA:
+ case LUA_TLIGHTUSERDATA:
+ return lua_touserdata(L, idx);
+ default: return NULL;
+ }
+}
+
+
+
+/*
+** push functions (C -> stack)
+*/
+
+
+LUA_API void lua_pushnil (lua_State *L) {
+ lua_lock(L);
+ setnilvalue(L->top);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
+ lua_lock(L);
+ setnvalue(L->top, n);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
+ lua_lock(L);
+ setnvalue(L->top, cast_num(n));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
+ lua_lock(L);
+ luaC_checkGC(L);
+ setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushstring (lua_State *L, const char *s) {
+ if (s == NULL)
+ lua_pushnil(L);
+ else
+ lua_pushlstring(L, s, strlen(s));
+}
+
+
+LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
+ va_list argp) {
+ const char *ret;
+ lua_lock(L);
+ luaC_checkGC(L);
+ ret = luaO_pushvfstring(L, fmt, argp);
+ lua_unlock(L);
+ return ret;
+}
+
+
+LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
+ const char *ret;
+ va_list argp;
+ lua_lock(L);
+ luaC_checkGC(L);
+ va_start(argp, fmt);
+ ret = luaO_pushvfstring(L, fmt, argp);
+ va_end(argp);
+ lua_unlock(L);
+ return ret;
+}
+
+
+LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
+ Closure *cl;
+ lua_lock(L);
+ luaC_checkGC(L);
+ api_checknelems(L, n);
+ cl = luaF_newCclosure(L, n, getcurrenv(L));
+ cl->c.f = fn;
+ L->top -= n;
+ while (n--)
+ setobj2n(L, &cl->c.upvalue[n], L->top+n);
+ setclvalue(L, L->top, cl);
+ lua_assert(iswhite(obj2gco(cl)));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushboolean (lua_State *L, int b) {
+ lua_lock(L);
+ setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
+ lua_lock(L);
+ setpvalue(L->top, p);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_pushthread (lua_State *L) {
+ lua_lock(L);
+ setthvalue(L, L->top, L);
+ api_incr_top(L);
+ lua_unlock(L);
+ return (G(L)->mainthread == L);
+}
+
+
+
+/*
+** get functions (Lua -> stack)
+*/
+
+
+LUA_API void lua_gettable (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ t = index2adr(L, idx);
+ api_checkvalidindex(L, t);
+ luaV_gettable(L, t, L->top - 1, L->top - 1);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
+ StkId t;
+ TValue key;
+ lua_lock(L);
+ t = index2adr(L, idx);
+ api_checkvalidindex(L, t);
+ setsvalue(L, &key, luaS_new(L, k));
+ luaV_gettable(L, t, &key, L->top);
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawget (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ t = index2adr(L, idx);
+ api_check(L, ttistable(t));
+ setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
+ StkId o;
+ lua_lock(L);
+ o = index2adr(L, idx);
+ api_check(L, ttistable(o));
+ setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
+ lua_lock(L);
+ luaC_checkGC(L);
+ sethvalue(L, L->top, luaH_new(L, narray, nrec));
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_getmetatable (lua_State *L, int objindex) {
+ const TValue *obj;
+ Table *mt = NULL;
+ int res;
+ lua_lock(L);
+ obj = index2adr(L, objindex);
+ switch (ttype(obj)) {
+ case LUA_TTABLE:
+ mt = hvalue(obj)->metatable;
+ break;
+ case LUA_TUSERDATA:
+ mt = uvalue(obj)->metatable;
+ break;
+ default:
+ mt = G(L)->mt[ttype(obj)];
+ break;
+ }
+ if (mt == NULL)
+ res = 0;
+ else {
+ sethvalue(L, L->top, mt);
+ api_incr_top(L);
+ res = 1;
+ }
+ lua_unlock(L);
+ return res;
+}
+
+
+LUA_API void lua_getfenv (lua_State *L, int idx) {
+ StkId o;
+ lua_lock(L);
+ o = index2adr(L, idx);
+ api_checkvalidindex(L, o);
+ switch (ttype(o)) {
+ case LUA_TFUNCTION:
+ sethvalue(L, L->top, clvalue(o)->c.env);
+ break;
+ case LUA_TUSERDATA:
+ sethvalue(L, L->top, uvalue(o)->env);
+ break;
+ case LUA_TTHREAD:
+ setobj2s(L, L->top, gt(thvalue(o)));
+ break;
+ default:
+ setnilvalue(L->top);
+ break;
+ }
+ api_incr_top(L);
+ lua_unlock(L);
+}
+
+
+/*
+** set functions (stack -> Lua)
+*/
+
+
+LUA_API void lua_settable (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ api_checknelems(L, 2);
+ t = index2adr(L, idx);
+ api_checkvalidindex(L, t);
+ luaV_settable(L, t, L->top - 2, L->top - 1);
+ L->top -= 2; /* pop index and value */
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
+ StkId t;
+ TValue key;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ t = index2adr(L, idx);
+ api_checkvalidindex(L, t);
+ setsvalue(L, &key, luaS_new(L, k));
+ luaV_settable(L, t, &key, L->top - 1);
+ L->top--; /* pop value */
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawset (lua_State *L, int idx) {
+ StkId t;
+ lua_lock(L);
+ api_checknelems(L, 2);
+ t = index2adr(L, idx);
+ api_check(L, ttistable(t));
+ setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
+ luaC_barriert(L, hvalue(t), L->top-1);
+ L->top -= 2;
+ lua_unlock(L);
+}
+
+
+LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
+ StkId o;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ o = index2adr(L, idx);
+ api_check(L, ttistable(o));
+ setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
+ luaC_barriert(L, hvalue(o), L->top-1);
+ L->top--;
+ lua_unlock(L);
+}
+
+
+LUA_API int lua_setmetatable (lua_State *L, int objindex) {
+ TValue *obj;
+ Table *mt;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ obj = index2adr(L, objindex);
+ api_checkvalidindex(L, obj);
+ if (ttisnil(L->top - 1))
+ mt = NULL;
+ else {
+ api_check(L, ttistable(L->top - 1));
+ mt = hvalue(L->top - 1);
+ }
+ switch (ttype(obj)) {
+ case LUA_TTABLE: {
+ hvalue(obj)->metatable = mt;
+ if (mt)
+ luaC_objbarriert(L, hvalue(obj), mt);
+ break;
+ }
+ case LUA_TUSERDATA: {
+ uvalue(obj)->metatable = mt;
+ if (mt)
+ luaC_objbarrier(L, rawuvalue(obj), mt);
+ break;
+ }
+ default: {
+ G(L)->mt[ttype(obj)] = mt;
+ break;
+ }
+ }
+ L->top--;
+ lua_unlock(L);
+ return 1;
+}
+
+
+LUA_API int lua_setfenv (lua_State *L, int idx) {
+ StkId o;
+ int res = 1;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ o = index2adr(L, idx);
+ api_checkvalidindex(L, o);
+ api_check(L, ttistable(L->top - 1));
+ switch (ttype(o)) {
+ case LUA_TFUNCTION:
+ clvalue(o)->c.env = hvalue(L->top - 1);
+ break;
+ case LUA_TUSERDATA:
+ uvalue(o)->env = hvalue(L->top - 1);
+ break;
+ case LUA_TTHREAD:
+ sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
+ break;
+ default:
+ res = 0;
+ break;
+ }
+ if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
+ L->top--;
+ lua_unlock(L);
+ return res;
+}
+
+
+/*
+** `load' and `call' functions (run Lua code)
+*/
+
+
+#define adjustresults(L,nres) \
+ { if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
+
+
+#define checkresults(L,na,nr) \
+ api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
+
+
+LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
+ StkId func;
+ lua_lock(L);
+ api_checknelems(L, nargs+1);
+ checkresults(L, nargs, nresults);
+ func = L->top - (nargs+1);
+ luaD_call(L, func, nresults);
+ adjustresults(L, nresults);
+ lua_unlock(L);
+}
+
+
+
+/*
+** Execute a protected call.
+*/
+struct CallS { /* data to `f_call' */
+ StkId func;
+ int nresults;
+};
+
+
+static void f_call (lua_State *L, void *ud) {
+ struct CallS *c = cast(struct CallS *, ud);
+ luaD_call(L, c->func, c->nresults);
+}
+
+
+
+LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
+ struct CallS c;
+ int status;
+ ptrdiff_t func;
+ lua_lock(L);
+ api_checknelems(L, nargs+1);
+ checkresults(L, nargs, nresults);
+ if (errfunc == 0)
+ func = 0;
+ else {
+ StkId o = index2adr(L, errfunc);
+ api_checkvalidindex(L, o);
+ func = savestack(L, o);
+ }
+ c.func = L->top - (nargs+1); /* function to be called */
+ c.nresults = nresults;
+ status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
+ adjustresults(L, nresults);
+ lua_unlock(L);
+ return status;
+}
+
+
+/*
+** Execute a protected C call.
+*/
+struct CCallS { /* data to `f_Ccall' */
+ lua_CFunction func;
+ void *ud;
+};
+
+
+static void f_Ccall (lua_State *L, void *ud) {
+ struct CCallS *c = cast(struct CCallS *, ud);
+ Closure *cl;
+ cl = luaF_newCclosure(L, 0, getcurrenv(L));
+ cl->c.f = c->func;
+ setclvalue(L, L->top, cl); /* push function */
+ api_incr_top(L);
+ setpvalue(L->top, c->ud); /* push only argument */
+ api_incr_top(L);
+ luaD_call(L, L->top - 2, 0);
+}
+
+
+LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
+ struct CCallS c;
+ int status;
+ lua_lock(L);
+ c.func = func;
+ c.ud = ud;
+ status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
+ lua_unlock(L);
+ return status;
+}
+
+
+LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
+ const char *chunkname) {
+ ZIO z;
+ int status;
+ lua_lock(L);
+ if (!chunkname) chunkname = "?";
+ luaZ_init(L, &z, reader, data);
+ status = luaD_protectedparser(L, &z, chunkname);
+ lua_unlock(L);
+ return status;
+}
+
+
+LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
+ int status;
+ TValue *o;
+ lua_lock(L);
+ api_checknelems(L, 1);
+ o = L->top - 1;
+ if (isLfunction(o))
+ status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
+ else
+ status = 1;
+ lua_unlock(L);
+ return status;
+}
+
+
+LUA_API int lua_status (lua_State *L) {
+ return L->status;
+}
+
+
+/*
+** Garbage-collection function
+*/
+
+LUA_API int lua_gc (lua_State *L, int what, int data) {
+ int res = 0;
+ global_State *g;
+ lua_lock(L);
+ g = G(L);
+ switch (what) {
+ case LUA_GCSTOP: {
+ g->GCthreshold = MAX_LUMEM;
+ break;
+ }
+ case LUA_GCRESTART: {
+ g->GCthreshold = g->totalbytes;
+ break;
+ }
+ case LUA_GCCOLLECT: {
+ luaC_fullgc(L);
+ break;
+ }
+ case LUA_GCCOUNT: {
+ /* GC values are expressed in Kbytes: #bytes/2^10 */
+ res = cast_int(g->totalbytes >> 10);
+ break;
+ }
+ case LUA_GCCOUNTB: {
+ res = cast_int(g->totalbytes & 0x3ff);
+ break;
+ }
+ case LUA_GCSTEP: {
+ lu_mem a = (cast(lu_mem, data) << 10);
+ if (a <= g->totalbytes)
+ g->GCthreshold = g->totalbytes - a;
+ else
+ g->GCthreshold = 0;
+ while (g->GCthreshold <= g->totalbytes) {
+ luaC_step(L);
+ if (g->gcstate == GCSpause) { /* end of cycle? */
+ res = 1; /* signal it */
+ break;
+ }
+ }
+ break;
+ }
+ case LUA_GCSETPAUSE: {
+ res = g->gcpause;
+ g->gcpause = data;
+ break;
+ }
+ case LUA_GCSETSTEPMUL: {
+ res = g->gcstepmul;
+ g->gcstepmul = data;
+ break;
+ }
+ default: res = -1; /* invalid option */
+ }
+ lua_unlock(L);
+ return res;
+}
+
+
+
+/*
+** miscellaneous functions
+*/
+
+
+LUA_API int lua_error (lua_State *L) {
+ lua_lock(L);
+ api_checknelems(L, 1);
+ luaG_errormsg(L);
+ lua_unlock(L);
+ return 0; /* to avoid warnings */
+}
+
+
+LUA_API int lua_next (lua_State *L, int idx) {
+ StkId t;
+ int more;
+ lua_lock(L);
+ t = index2adr(L, idx);
+ api_check(L, ttistable(t));
+ more = luaH_next(L, hvalue(t), L->top - 1);
+ if (more) {
+ api_incr_top(L);
+ }
+ else /* no more elements */
+ L->top -= 1; /* remove key */
+ lua_unlock(L);
+ return more;
+}
+
+
+LUA_API void lua_concat (lua_State *L, int n) {
+ lua_lock(L);
+ api_checknelems(L, n);
+ if (n >= 2) {
+ luaC_checkGC(L);
+ luaV_concat(L, n, cast_int(L->top - L->base) - 1);
+ L->top -= (n-1);
+ }
+ else if (n == 0) { /* push empty string */
+ setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
+ api_incr_top(L);
+ }
+ /* else n == 1; nothing to do */
+ lua_unlock(L);
+}
+
+
+LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
+ lua_Alloc f;
+ lua_lock(L);
+ if (ud) *ud = G(L)->ud;
+ f = G(L)->frealloc;
+ lua_unlock(L);
+ return f;
+}
+
+
+LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
+ lua_lock(L);
+ G(L)->ud = ud;
+ G(L)->frealloc = f;
+ lua_unlock(L);
+}
+
+
+LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
+ Udata *u;
+ lua_lock(L);
+ luaC_checkGC(L);
+ u = luaS_newudata(L, size, getcurrenv(L));
+ setuvalue(L, L->top, u);
+ api_incr_top(L);
+ lua_unlock(L);
+ return u + 1;
+}
+
+
+
+
+static const char *aux_upvalue (StkId fi, int n, TValue **val) {
+ Closure *f;
+ if (!ttisfunction(fi)) return NULL;
+ f = clvalue(fi);
+ if (f->c.isC) {
+ if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
+ *val = &f->c.upvalue[n-1];
+ return "";
+ }
+ else {
+ Proto *p = f->l.p;
+ if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
+ *val = f->l.upvals[n-1]->v;
+ return getstr(p->upvalues[n-1]);
+ }
+}
+
+
+LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
+ const char *name;
+ TValue *val;
+ lua_lock(L);
+ name = aux_upvalue(index2adr(L, funcindex), n, &val);
+ if (name) {
+ setobj2s(L, L->top, val);
+ api_incr_top(L);
+ }
+ lua_unlock(L);
+ return name;
+}
+
+
+LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
+ const char *name;
+ TValue *val;
+ StkId fi;
+ lua_lock(L);
+ fi = index2adr(L, funcindex);
+ api_checknelems(L, 1);
+ name = aux_upvalue(fi, n, &val);
+ if (name) {
+ L->top--;
+ setobj(L, val, L->top);
+ luaC_barrier(L, clvalue(fi), L->top);
+ }
+ lua_unlock(L);
+ return name;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 05:57:09 +0100