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alloc.c revision 1.12 
      1 /* $NetBSD: alloc.c,v 1.12 2003/08/07 09:05:03 agc 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 1.12 2003/08/07 09:05:03 agc 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 }
    118