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/* alloc.c
Allocate within a memory block.
Copyright (C) 1992 Ian Lance Taylor
This file is part of the Taylor UUCP uuconf library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License
as published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This library 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 GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
*/
#include "uucnfi.h"
#if USE_RCS_ID
const char _uuconf_alloc_rcsid[] = "$FreeBSD$";
#endif
#include "alloc.h"
/* Allocate some memory out of a memory block. If the memory block is
NULL, this just calls malloc; this is convenient for a number of
routines. If this fails, uuconf_errno will be set, and the calling
routine may return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO. */
pointer
uuconf_malloc (pblock, c)
pointer pblock;
size_t c;
{
struct sblock *q = (struct sblock *) pblock;
pointer pret;
if (c == 0)
return NULL;
if (q == NULL)
return malloc (c);
/* Make sure that c is aligned to a double boundary. */
c = ((c + sizeof (double) - 1) / sizeof (double)) * sizeof (double);
while (q->ifree + c > CALLOC_SIZE)
{
if (q->qnext != NULL)
q = q->qnext;
else
{
if (c > CALLOC_SIZE)
q->qnext = (struct sblock *) malloc (sizeof (struct sblock)
+ c - CALLOC_SIZE);
else
q->qnext = (struct sblock *) malloc (sizeof (struct sblock));
if (q->qnext == NULL)
return NULL;
q = q->qnext;
q->qnext = NULL;
q->ifree = 0;
q->qadded = NULL;
break;
}
}
pret = q->u.ab + q->ifree;
q->ifree += c;
q->plast = pret;
return pret;
}
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