usr.bin/window/wwalloc.c

   1 /*      $NetBSD: wwalloc.c,v 1.6 2003/08/07 11:17:36 agc Exp $  */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)wwalloc.c   8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: wwalloc.c,v 1.6 2003/08/07 11:17:36 agc Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <stdlib.h>
  45 #include "ww.h"
  46
  47 char **
  48 wwalloc(int row, int col, int nrow, int ncol, int size)
  49 {
  50         char *p, **pp;
  51         int i;
  52
  53         /* fast, call malloc only once */
  54         pp = (char **)
  55                 malloc((unsigned) sizeof (char **) * nrow + size * nrow * ncol);
  56         if (pp == 0) {
  57                 wwerrno = WWE_NOMEM;
  58                 return 0;
  59         }
  60         p = (char *)&pp[nrow];
  61         col *= size;
  62         size /= sizeof (char);          /* paranoid */
  63         size *= ncol;
  64         for (i = 0; i < nrow; i++) {
  65                 pp[i] = p - col;
  66                 p += size;
  67         }
  68         return pp - row;
  69 }
  70
  71 void
  72 wwfree(char **p, int row)
  73 {
  74         free((char *)(p + row));
  75 }