98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
/* alloca.c
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A very simplistic alloca routine.
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Copyright (C) 1991, 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program 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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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; 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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c/o AIRS, P.O. Box 520, Waltham, MA 02254.
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$Log: alloca.c,v $
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Revision 1.1.1.1 1993/03/21 09:45:37 cgd
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initial import of 386bsd-0.1 sources
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Revision 1.1 1992/02/23 03:26:51 ian
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Initial revision
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*/
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#include "uucp.h"
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#if USE_RCS_ID
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char alloca_rcsid[] = "$Id: alloca.c,v 1.1.1.1 1993/03/21 09:45:37 cgd Exp $";
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#endif
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/* A simplistic implementation of alloca. I could just include Doug
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Gwyn's alloca, but this is simpler for what I need and it's
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guaranteed to be portable. It will only work for a simple program
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like this one. Obviously a real alloca will be preferable. */
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static void uaclear_alloca P((void));
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struct salloca
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{
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struct salloca *qnext;
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pointer pbuf;
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};
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static struct salloca *qAlloca;
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/* Allocate temporary storage. */
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pointer
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alloca (isize)
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int isize;
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{
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struct salloca *q;
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if (isize == 0)
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{
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uaclear_alloca ();
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return NULL;
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}
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q = (struct salloca *) malloc (sizeof (struct salloca));
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if (q == NULL)
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abort ();
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q->qnext = qAlloca;
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qAlloca = q;
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q->pbuf = malloc (isize);
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if (q->pbuf == NULL)
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abort ();
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return q->pbuf;
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}
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/* Free up all temporary storage. */
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static void
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uaclear_alloca ()
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{
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struct salloca *q;
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q = qAlloca;
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while (q != NULL)
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{
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struct salloca *qnext;
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free (q->pbuf);
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qnext = q->qnext;
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free ((pointer) q);
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q = qnext;
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}
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qAlloca = NULL;
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}
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