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alloc.c revision 1.11 
      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. 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 1.11 2002/05/25 23:29:16 wiz Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 
     47 #include <unistd.h>
     48 #include <stdarg.h>
     49 #include <stdlib.h>
     50 
     51 #include "csh.h"
     52 #include "extern.h"
     53 
     54 char *memtop = NULL;		/* PWP: top of current memory */
     55 char *membot = NULL;		/* PWP: bottom of allocatable memory */
     56 
     57 ptr_t
     58 Malloc(size_t n)
     59 {
     60     ptr_t ptr;
     61 
     62     if (membot == NULL)
     63 	memtop = membot = sbrk(0);
     64     if ((ptr = malloc(n)) == (ptr_t) 0) {
     65 	child++;
     66 	stderror(ERR_NOMEM);
     67     }
     68     return (ptr);
     69 }
     70 
     71 ptr_t
     72 Realloc(ptr_t p, size_t n)
     73 {
     74     ptr_t ptr;
     75 
     76     if (membot == NULL)
     77 	memtop = membot = sbrk(0);
     78     if ((ptr = realloc(p, n)) == (ptr_t) 0) {
     79 	child++;
     80 	stderror(ERR_NOMEM);
     81     }
     82     return (ptr);
     83 }
     84 
     85 ptr_t
     86 Calloc(size_t s, size_t n)
     87 {
     88     ptr_t ptr;
     89 
     90     if (membot == NULL)
     91 	memtop = membot = sbrk(0);
     92     if ((ptr = calloc(s, n)) == (ptr_t) 0) {
     93 	child++;
     94 	stderror(ERR_NOMEM);
     95     }
     96     return (ptr);
     97 }
     98 
     99 void
    100 Free(ptr_t p)
    101 {
    102     if (p)
    103 	free(p);
    104 }
    105 
    106 /*
    107  * mstats - print out statistics about malloc
    108  *
    109  * Prints two lines of numbers, one showing the length of the free list
    110  * for each size category, the second showing the number of mallocs -
    111  * frees for each size category.
    112  */
    113 void
    114 /*ARGSUSED*/
    115 showall(Char **v, struct command *t)
    116 {
    117     memtop = (char *)sbrk(0);
    118     (void)fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
    119 	    (unsigned long)membot, (unsigned long)memtop,
    120 	    (unsigned long)(memtop - membot));
    121 }
    122