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/*
flext - C++ layer for Max/MSP and pd (pure data) externals
Copyright (c) 2001-2005 Thomas Grill (gr@grrrr.org)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
/*! \file flatom.cpp
\brief Definitions for handling the t_atom type and lists thereof.
*/
#include "flext.h"
#include <string.h> // for memcpy
#if FLEXT_SYS != FLEXT_SYS_JMAX
int flext::CmpAtom(const t_atom &a,const t_atom &b)
{
if(GetType(a) == GetType(b)) {
switch(GetType(a)) {
case A_FLOAT: return GetFloat(a) == GetFloat(b)?0:(GetFloat(a) < GetFloat(b)?-1:1);
#if FLEXT_SYS == FLEXT_SYS_MAX
case A_INT: return GetInt(a) == GetInt(b)?0:(GetInt(a) < GetInt(b)?-1:1);
#endif
case A_SYMBOL: return GetSymbol(a) == GetSymbol(b)?0:(GetSymbol(a) < GetSymbol(b)?-1:1);
#if FLEXT_SYS == FLEXT_SYS_PD
case A_POINTER: return GetPointer(a) == GetPointer(b)?0:(GetPointer(a) < GetPointer(b)?-1:1);
#endif
default:
// can't be compared.....
FLEXT_ASSERT(false);
return 0;
}
}
else
return GetType(a) < GetType(b)?-1:1;
}
#else
#error Not implemented
#endif
t_atom *flext::CopyList(int argc,const t_atom *argv)
{
t_atom *dst = new t_atom[argc];
memcpy(dst,argv,argc*sizeof(t_atom));
return dst;
}
void flext::CopyAtoms(int cnt,t_atom *dst,const t_atom *src)
{
if(dst < src)
// forward
memcpy(dst,src,cnt*sizeof(t_atom));
else
// backwards
while(cnt--) dst[cnt] = src[cnt];
}
void flext::AtomList::Alloc(int sz,int keepix,int keeplen,int keepto)
{
if(lst) {
if(cnt == sz) {
if(keepix != keepto) {
int c = keeplen >= 0?keeplen:cnt;
FLEXT_ASSERT(c+keepto <= cnt);
FLEXT_ASSERT(c+keepix <= cnt);
CopyAtoms(c,lst+keepto,lst+keepix);
}
return; // no change
}
t_atom *l;
if(sz) {
l = new t_atom[sz];
if(keepix >= 0) {
// keep contents
int c = keeplen >= 0?keeplen:(cnt > sz?sz:cnt);
FLEXT_ASSERT(c+keepto <= sz);
FLEXT_ASSERT(c+keepix <= cnt);
CopyAtoms(c,l+keepto,lst+keepix);
}
}
else
l = NULL;
Free();
lst = l,cnt = sz;
}
else {
FLEXT_ASSERT(cnt == 0);
if(sz) lst = new t_atom[cnt = sz];
}
}
flext::AtomList::~AtomList() { Free(); }
void flext::AtomList::Free()
{
if(lst) {
delete[] lst; lst = NULL;
cnt = 0;
}
else
FLEXT_ASSERT(cnt == 0);
}
flext::AtomList &flext::AtomList::Set(int argc,const t_atom *argv,int offs,bool resize)
{
int ncnt = argc+offs;
if(resize) Alloc(ncnt);
// argv can be NULL independently from argc
if(argv) CopyAtoms(argc,lst+offs,argv);
return *this;
}
int flext::AtomList::Compare(const AtomList &a) const
{
if(Count() == a.Count()) {
for(int i = 0; i < Count(); ++i) {
int cmp = CmpAtom(lst[i],a[i]);
if(cmp) return cmp;
}
return 0;
}
else
return Count() < a.Count()?-1:1;
}
flext::AtomListStaticBase::~AtomListStaticBase() { Free(); }
void flext::AtomListStaticBase::Alloc(int sz,int keepix,int keeplen,int keepto)
{
if(sz <= precnt) {
// small enough for pre-allocated space
if(lst != predata && lst) {
// currently allocated memory is larger than what we need
if(keepix >= 0) {
// keep contents
int c = keeplen >= 0?keeplen:(cnt > sz?sz:cnt);
FLEXT_ASSERT(c+keepto <= precnt);
FLEXT_ASSERT(c+keepix <= cnt);
CopyAtoms(c,predata+keepto,lst+keepix);
}
// free allocated memory
AtomList::Free();
}
lst = predata,cnt = sz;
}
else
AtomList::Alloc(sz,keepix,keeplen,keepto);
}
void flext::AtomListStaticBase::Free()
{
if(lst != predata) AtomList::Free();
else lst = NULL,cnt = 0;
}
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