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alloc.c revision 1.10 
      1 /* $NetBSD: alloc.c,v 1.10 2001/09/14 14:03:59 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)alloc.c	8.1 (Berkeley) 5/31/93";
     40 #else
     41 __RCSID("$NetBSD: alloc.c,v 1.10 2001/09/14 14:03:59 wiz Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 
     47 #include <unistd.h>
     48 #include <stdlib.h>
     49 
     50 #if __STDC__
     51 # include <stdarg.h>
     52 #else
     53 # include <varargs.h>
     54 #endif
     55 
     56 #include "csh.h"
     57 #include "extern.h"
     58 
     59 char *memtop = NULL;		/* PWP: top of current memory */
     60 char *membot = NULL;		/* PWP: bottom of allocatable memory */
     61 
     62 ptr_t
     63 Malloc(size_t n)
     64 {
     65     ptr_t ptr;
     66 
     67     if (membot == NULL)
     68 	memtop = membot = sbrk(0);
     69     if ((ptr = malloc(n)) == (ptr_t) 0) {
     70 	child++;
     71 	stderror(ERR_NOMEM);
     72     }
     73     return (ptr);
     74 }
     75 
     76 ptr_t
     77 Realloc(ptr_t p, size_t n)
     78 {
     79     ptr_t ptr;
     80 
     81     if (membot == NULL)
     82 	memtop = membot = sbrk(0);
     83     if ((ptr = realloc(p, n)) == (ptr_t) 0) {
     84 	child++;
     85 	stderror(ERR_NOMEM);
     86     }
     87     return (ptr);
     88 }
     89 
     90 ptr_t
     91 Calloc(size_t s, size_t n)
     92 {
     93     ptr_t ptr;
     94 
     95     if (membot == NULL)
     96 	memtop = membot = sbrk(0);
     97     if ((ptr = calloc(s, n)) == (ptr_t) 0) {
     98 	child++;
     99 	stderror(ERR_NOMEM);
    100     }
    101     return (ptr);
    102 }
    103 
    104 void
    105 Free(ptr_t p)
    106 {
    107     if (p)
    108 	free(p);
    109 }
    110 
    111 /*
    112  * mstats - print out statistics about malloc
    113  *
    114  * Prints two lines of numbers, one showing the length of the free list
    115  * for each size category, the second showing the number of mallocs -
    116  * frees for each size category.
    117  */
    118 void
    119 /*ARGSUSED*/
    120 showall(Char **v, struct command *t)
    121 {
    122     memtop = (char *)sbrk(0);
    123     (void)fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
    124 	    (unsigned long)membot, (unsigned long)memtop,
    125 	    (unsigned long)(memtop - membot));
    126 }
    127