shithub: minivmac

ref: d488fabe62aabd0d42421eb3e423a9308ae1fa13
dir: /src/PBUFSTDC.h/

/*
	PBUFSTDC.h

	Copyright (C) 2018 Paul C. Pratt

	You can redistribute this file and/or modify it under the terms
	of version 2 of the GNU General Public License as published by
	the Free Software Foundation.  You should have received a copy
	of the license along with this file; see the file COPYING.

	This file is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	license for more details.
*/

/*
	Parameter BUFfers implemented with STanDard C library
*/


#if IncludePbufs
LOCALVAR void *PbufDat[NumPbufs];
#endif

#if IncludePbufs
LOCALFUNC tMacErr PbufNewFromPtr(void *p, ui5b count, tPbuf *r)
{
	tPbuf i;
	tMacErr err;

	if (! FirstFreePbuf(&i)) {
		free(p);
		err = mnvm_miscErr;
	} else {
		*r = i;
		PbufDat[i] = p;
		PbufNewNotify(i, count);
		err = mnvm_noErr;
	}

	return err;
}
#endif

#if IncludePbufs
LOCALPROC PbufKillToPtr(void **p, ui5r *count, tPbuf r)
{
	*p = PbufDat[r];
	*count = PbufSize[r];

	PbufDisposeNotify(r);
}
#endif

#if IncludePbufs
GLOBALOSGLUFUNC tMacErr PbufNew(ui5b count, tPbuf *r)
{
	tMacErr err = mnvm_miscErr;

	void *p = calloc(1, count);
	if (NULL != p) {
		err = PbufNewFromPtr(p, count, r);
	}

	return err;
}
#endif

#if IncludePbufs
GLOBALOSGLUPROC PbufDispose(tPbuf i)
{
	void *p;
	ui5r count;

	PbufKillToPtr(&p, &count, i);

	free(p);
}
#endif

#if IncludePbufs
LOCALPROC UnInitPbufs(void)
{
	tPbuf i;

	for (i = 0; i < NumPbufs; ++i) {
		if (PbufIsAllocated(i)) {
			PbufDispose(i);
		}
	}
}
#endif

#if IncludePbufs
#define PbufHaveLock 1
#endif

#if IncludePbufs
LOCALFUNC ui3p PbufLock(tPbuf i)
{
	return (ui3p)PbufDat[i];
}
#endif

#if IncludePbufs
#define PbufUnlock(i)
#endif

#if IncludePbufs
GLOBALOSGLUPROC PbufTransfer(ui3p Buffer,
	tPbuf i, ui5r offset, ui5r count, blnr IsWrite)
{
	void *p = ((ui3p)PbufDat[i]) + offset;
	if (IsWrite) {
		(void) memcpy(p, Buffer, count);
	} else {
		(void) memcpy(Buffer, p, count);
	}
}
#endif