bin/csh/alloc.c

   1 /* $NetBSD: alloc.c,v 1.11 2002/05/25 23:29:16 wiz Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1983, 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)alloc.c     8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: alloc.c,v 1.11 2002/05/25 23:29:16 wiz Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/types.h>
  42
  43 #include <unistd.h>
  44 #include <stdarg.h>
  45 #include <stdlib.h>
  46
  47 #include "csh.h"
  48 #include "extern.h"
  49
  50 char *memtop = NULL;            /* PWP: top of current memory */
  51 char *membot = NULL;            /* PWP: bottom of allocatable memory */
  52
  53 ptr_t
  54 Malloc(size_t n)
  55 {
  56     ptr_t ptr;
  57
  58     if (membot == NULL)
  59         memtop = membot = sbrk(0);
  60     if ((ptr = malloc(n)) == (ptr_t) 0) {
  61         child++;
  62         stderror(ERR_NOMEM);
  63     }
  64     return (ptr);
  65 }
  66
  67 ptr_t
  68 Realloc(ptr_t p, size_t n)
  69 {
  70     ptr_t ptr;
  71
  72     if (membot == NULL)
  73         memtop = membot = sbrk(0);
  74     if ((ptr = realloc(p, n)) == (ptr_t) 0) {
  75         child++;
  76         stderror(ERR_NOMEM);
  77     }
  78     return (ptr);
  79 }
  80
  81 ptr_t
  82 Calloc(size_t s, size_t n)
  83 {
  84     ptr_t ptr;
  85
  86     if (membot == NULL)
  87         memtop = membot = sbrk(0);
  88     if ((ptr = calloc(s, n)) == (ptr_t) 0) {
  89         child++;
  90         stderror(ERR_NOMEM);
  91     }
  92     return (ptr);
  93 }
  94
  95 void
  96 Free(ptr_t p)
  97 {
  98     if (p)
  99         free(p);
 100 }
 101
 102 /*
 103  * mstats - print out statistics about malloc
 104  *
 105  * Prints two lines of numbers, one showing the length of the free list
 106  * for each size category, the second showing the number of mallocs -
 107  * frees for each size category.
 108  */
 109 void
 110 /*ARGSUSED*/
 111 showall(Char **v, struct command *t)
 112 {
 113     memtop = (char *)sbrk(0);
 114     (void)fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
 115             (unsigned long)membot, (unsigned long)memtop,
 116             (unsigned long)(memtop - membot));
 117 }