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Annotation of coherent/g/usr/lib/uucp/tay104/uuconf/alloc.c, revision 1.1

1.1     ! root        1: /* alloc.c
        !             2:    Allocate within a memory block.
        !             3: 
        !             4:    Copyright (C) 1992 Ian Lance Taylor
        !             5: 
        !             6:    This file is part of the Taylor UUCP uuconf library.
        !             7: 
        !             8:    This library is free software; you can redistribute it and/or
        !             9:    modify it under the terms of the GNU Library General Public License
        !            10:    as published by the Free Software Foundation; either version 2 of
        !            11:    the License, or (at your option) any later version.
        !            12: 
        !            13:    This library is distributed in the hope that it will be useful, but
        !            14:    WITHOUT ANY WARRANTY; without even the implied warranty of
        !            15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            16:    Library General Public License for more details.
        !            17: 
        !            18:    You should have received a copy of the GNU Library General Public
        !            19:    License along with this library; if not, write to the Free Software
        !            20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            21: 
        !            22:    The author of the program may be contacted at [email protected] or
        !            23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
        !            24:    */
        !            25: 
        !            26: #include "uucnfi.h"
        !            27: 
        !            28: #if USE_RCS_ID
        !            29: const char _uuconf_alloc_rcsid[] = "$Id: alloc.c,v 1.1 93/07/30 08:06:59 bin Exp Locker: bin $";
        !            30: #endif
        !            31: 
        !            32: #include "alloc.h"
        !            33: 
        !            34: /* Allocate some memory out of a memory block.  If the memory block is
        !            35:    NULL, this just calls malloc; this is convenient for a number of
        !            36:    routines.  If this fails, uuconf_errno will be set, and the calling
        !            37:    routine may return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO.  */
        !            38: 
        !            39: pointer
        !            40: uuconf_malloc (pblock, c)
        !            41:      pointer pblock;
        !            42:      size_t c;
        !            43: {
        !            44:   struct sblock *q = (struct sblock *) pblock;
        !            45:   pointer pret;
        !            46: 
        !            47:   if (c == 0)
        !            48:     return NULL;
        !            49: 
        !            50:   if (q == NULL)
        !            51:     return malloc (c);
        !            52: 
        !            53:   /* Make sure that c is aligned to a double boundary.  */
        !            54:   c = ((c + sizeof (double) - 1) / sizeof (double)) * sizeof (double);
        !            55: 
        !            56:   while (q->ifree + c > CALLOC_SIZE)
        !            57:     {
        !            58:       if (q->qnext != NULL)
        !            59:        q = q->qnext;
        !            60:       else
        !            61:        {
        !            62:          if (c > CALLOC_SIZE)
        !            63:            q->qnext = (struct sblock *) malloc (sizeof (struct sblock)
        !            64:                                                 + c - CALLOC_SIZE);
        !            65:          else
        !            66:            q->qnext = (struct sblock *) malloc (sizeof (struct sblock));
        !            67:          if (q->qnext == NULL)
        !            68:            return NULL;
        !            69:          q = q->qnext;
        !            70:          q->qnext = NULL;
        !            71:          q->ifree = 0;
        !            72:          q->qadded = NULL;
        !            73:          break;
        !            74:        }
        !            75:     }
        !            76: 
        !            77:   pret = q->u.ab + q->ifree;
        !            78:   q->ifree += c;
        !            79:   q->plast = pret;
        !            80: 
        !            81:   return pret;
        !            82: }

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