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📄 lapi.c

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/*** $Id: lapi.c,v 1.2 2007/04/20 13:46:03 bernd67 Exp $** Lua API** See Copyright Notice in lua.h*/#include <assert.h>#include <string.h>#define lapi_c#include "lua.h"#include "lapi.h"#include "ldebug.h"#include "ldo.h"#include "lfunc.h"#include "lgc.h"#include "lmem.h"#include "lobject.h"#include "lstate.h"#include "lstring.h"#include "ltable.h"#include "ltm.h"#include "lundump.h"#include "lvm.h"const char lua_ident[] =  "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n"  "$Authors: " LUA_AUTHORS " $\n"  "$URL: www.lua.org $\n";#ifndef api_check#define api_check(L, o)		/*{ assert(o); }*/#endif#define api_checknelems(L, n)	api_check(L, (n) <= (L->top - L->base))#define api_incr_top(L)   {api_check(L, L->top < L->ci->top); L->top++;}static TObject *negindex (lua_State *L, int idx) {  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_GLOBALSINDEX: return gt(L);    default: {      TObject *func = (L->base - 1);      idx = LUA_GLOBALSINDEX - idx;      lua_assert(iscfunction(func));      return (idx <= clvalue(func)->c.nupvalues)                ? &clvalue(func)->c.upvalue[idx-1]                : NULL;    }  }}static TObject *luaA_index (lua_State *L, int idx) {  if (idx > 0) {    api_check(L, idx <= L->top - L->base);    return L->base + idx - 1;  }  else {    TObject *o = negindex(L, idx);    api_check(L, o != NULL);    return o;  }}static TObject *luaA_indexAcceptable (lua_State *L, int idx) {  if (idx > 0) {    TObject *o = L->base+(idx-1);    api_check(L, idx <= L->stack_last - L->base);    if (o >= L->top) return NULL;    else return o;  }  else    return negindex(L, idx);}void luaA_pushobject (lua_State *L, const TObject *o) {  setobj2s(L->top, o);  incr_top(L);}LUA_API int lua_checkstack (lua_State *L, int size) {  int res;  lua_lock(L);  if ((L->top - L->base + size) > LUA_MAXCSTACK)    res = 0;  /* stack overflow */  else {    luaD_checkstack(L, size);    if (L->ci->top < L->top + size)      L->ci->top = L->top + size;    res = 1;  }  lua_unlock(L);  return res;}LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {  int i;  lua_lock(to);  api_checknelems(from, n);  from->top -= n;  for (i = 0; i < n; i++) {    setobj2s(to->top, from->top + i);    api_incr_top(to);  }  lua_unlock(to);}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->top, L1);  api_incr_top(L);  lua_unlock(L);  lua_userstateopen(L1);  return L1;}/*** basic stack manipulation*/LUA_API int lua_gettop (lua_State *L) {  return (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 = luaA_index(L, idx);  while (++p < L->top) setobjs2s(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 = luaA_index(L, idx);  for (q = L->top; q>p; q--) setobjs2s(q, q-1);  setobjs2s(p, L->top);  lua_unlock(L);}LUA_API void lua_replace (lua_State *L, int idx) {  lua_lock(L);  api_checknelems(L, 1);  setobj(luaA_index(L, idx), L->top - 1);  /* write barrier */  L->top--;  lua_unlock(L);}LUA_API void lua_pushvalue (lua_State *L, int idx) {  lua_lock(L);  setobj2s(L->top, luaA_index(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 = luaA_indexAcceptable(L, idx);  return (o == NULL) ? 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 = luaA_indexAcceptable(L, idx);  return (o == NULL) ? 0 : iscfunction(o);}LUA_API int lua_isnumber (lua_State *L, int idx) {  TObject n;  const TObject *o = luaA_indexAcceptable(L, idx);  return (o != NULL && 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 TObject *o = luaA_indexAcceptable(L, idx);  return (o != NULL && (ttisuserdata(o) || ttislightuserdata(o)));}LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {  StkId o1 = luaA_indexAcceptable(L, index1);  StkId o2 = luaA_indexAcceptable(L, index2);  return (o1 == NULL || o2 == NULL) ? 0  /* index out of range */                                    : 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 = luaA_indexAcceptable(L, index1);  o2 = luaA_indexAcceptable(L, index2);  i = (o1 == NULL || o2 == NULL) ? 0  /* index out of range */                                 : 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 = luaA_indexAcceptable(L, index1);  o2 = luaA_indexAcceptable(L, index2);  i = (o1 == NULL || o2 == NULL) ? 0  /* index out-of-range */                                 : luaV_lessthan(L, o1, o2);  lua_unlock(L);  return i;}LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {  TObject n;  const TObject *o = luaA_indexAcceptable(L, idx);  if (o != NULL && tonumber(o, &n))    return nvalue(o);  else    return 0;}LUA_API int lua_toboolean (lua_State *L, int idx) {  const TObject *o = luaA_indexAcceptable(L, idx);  return (o != NULL) && !l_isfalse(o);}LUA_API const char *lua_tostring (lua_State *L, int idx) {  StkId o = luaA_indexAcceptable(L, idx);  if (o == NULL)    return NULL;  else if (ttisstring(o))    return svalue(o);  else {    const char *s;    lua_lock(L);  /* `luaV_tostring' may create a new string */    s = (luaV_tostring(L, o) ? svalue(o) : NULL);    luaC_checkGC(L);    lua_unlock(L);    return s;  }}LUA_API size_t lua_strlen (lua_State *L, int idx) {  StkId o = luaA_indexAcceptable(L, idx);  if (o == NULL)    return 0;  else if (ttisstring(o))    return tsvalue(o)->tsv.len;  else {    size_t l;    lua_lock(L);  /* `luaV_tostring' may create a new string */    l = (luaV_tostring(L, o) ? tsvalue(o)->tsv.len : 0);    lua_unlock(L);    return l;  }}LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {  StkId o = luaA_indexAcceptable(L, idx);  return (o == NULL || !iscfunction(o)) ? NULL : clvalue(o)->c.f;}LUA_API void *lua_touserdata (lua_State *L, int idx) {  StkId o = luaA_indexAcceptable(L, idx);  if (o == NULL) return NULL;  switch (ttype(o)) {    case LUA_TUSERDATA: return (uvalue(o) + 1);    case LUA_TLIGHTUSERDATA: return pvalue(o);    default: return NULL;  }}LUA_API lua_State *lua_tothread (lua_State *L, int idx) {  StkId o = luaA_indexAcceptable(L, idx);  return (o == NULL || !ttisthread(o)) ? NULL : thvalue(o);}LUA_API const void *lua_topointer (lua_State *L, int idx) {  StkId o = luaA_indexAcceptable(L, idx);  if (o == NULL) return NULL;  else {    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_pushlstring (lua_State *L, const char *s, size_t len) {  lua_lock(L);  luaC_checkGC(L);  setsvalue2s(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);  cl->c.f = fn;  L->top -= n;  while (n--)    setobj2n(&cl->c.upvalue[n], L->top+n);  setclvalue(L->top, cl);  api_incr_top(L);  lua_unlock(L);}

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