1993-08-05 14:28:27 -04:00
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/* alloc.c
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Allocate within a memory block.
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Copyright (C) 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP uuconf library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License
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as published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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1994-05-07 14:14:43 -04:00
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c/o Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
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1993-08-05 14:28:27 -04:00
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*/
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#include "uucnfi.h"
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#if USE_RCS_ID
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1994-05-07 14:14:43 -04:00
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const char _uuconf_alloc_rcsid[] = "$Id: alloc.c,v 1.3 1994/01/30 21:14:29 ian Rel $";
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1993-08-05 14:28:27 -04:00
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#endif
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#include "alloc.h"
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/* Allocate some memory out of a memory block. If the memory block is
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NULL, this just calls malloc; this is convenient for a number of
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routines. If this fails, uuconf_errno will be set, and the calling
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routine may return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO. */
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pointer
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uuconf_malloc (pblock, c)
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pointer pblock;
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size_t c;
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{
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struct sblock *q = (struct sblock *) pblock;
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pointer pret;
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if (c == 0)
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return NULL;
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if (q == NULL)
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return malloc (c);
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/* Make sure that c is aligned to a double boundary. */
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c = ((c + sizeof (double) - 1) / sizeof (double)) * sizeof (double);
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while (q->ifree + c > CALLOC_SIZE)
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{
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if (q->qnext != NULL)
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q = q->qnext;
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else
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{
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if (c > CALLOC_SIZE)
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q->qnext = (struct sblock *) malloc (sizeof (struct sblock)
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+ c - CALLOC_SIZE);
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else
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q->qnext = (struct sblock *) malloc (sizeof (struct sblock));
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if (q->qnext == NULL)
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return NULL;
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q = q->qnext;
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q->qnext = NULL;
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q->ifree = 0;
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q->qadded = NULL;
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break;
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}
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}
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pret = q->u.ab + q->ifree;
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q->ifree += c;
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q->plast = pret;
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return pret;
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}
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