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Annotation of coherent/g/usr/lib/uucp/tay104/uuconf/alloc.c, revision 1.1.1.1

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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