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alloc.c revision 1.7 
      1 /*	$NetBSD: alloc.c,v 1.7 1997/07/04 21:23:51 christos 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 1.7 1997/07/04 21:23:51 christos Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 #include <unistd.h>
     47 #include <stdlib.h>
     48 #if __STDC__
     49 # include <stdarg.h>
     50 #else
     51 # include <varargs.h>
     52 #endif
     53 
     54 #include "csh.h"
     55 #include "extern.h"
     56 
     57 char   *memtop = NULL;		/* PWP: top of current memory */
     58 char   *membot = NULL;		/* PWP: bottom of allocatable memory */
     59 
     60 ptr_t
     61 Malloc(n)
     62     size_t  n;
     63 {
     64     ptr_t   ptr;
     65 
     66     if (membot == NULL)
     67 	memtop = membot = sbrk(0);
     68     if ((ptr = malloc(n)) == (ptr_t) 0) {
     69 	child++;
     70 	stderror(ERR_NOMEM);
     71     }
     72     return (ptr);
     73 }
     74 
     75 ptr_t
     76 Realloc(p, n)
     77     ptr_t   p;
     78     size_t  n;
     79 {
     80     ptr_t   ptr;
     81 
     82     if (membot == NULL)
     83 	memtop = membot = sbrk(0);
     84     if ((ptr = realloc(p, n)) == (ptr_t) 0) {
     85 	child++;
     86 	stderror(ERR_NOMEM);
     87     }
     88     return (ptr);
     89 }
     90 
     91 ptr_t
     92 Calloc(s, n)
     93     size_t  s, n;
     94 {
     95     ptr_t   ptr;
     96 
     97     if (membot == NULL)
     98 	memtop = membot = sbrk(0);
     99     if ((ptr = calloc(s, n)) == (ptr_t) 0) {
    100 	child++;
    101 	stderror(ERR_NOMEM);
    102     }
    103 
    104     return (ptr);
    105 }
    106 
    107 void
    108 Free(p)
    109     ptr_t   p;
    110 {
    111     if (p)
    112 	free(p);
    113 }
    114 
    115 /*
    116  * mstats - print out statistics about malloc
    117  *
    118  * Prints two lines of numbers, one showing the length of the free list
    119  * for each size category, the second showing the number of mallocs -
    120  * frees for each size category.
    121  */
    122 void
    123 /*ARGSUSED*/
    124 showall(v, t)
    125     Char **v;
    126     struct command *t;
    127 {
    128     memtop = (char *) sbrk(0);
    129     (void) fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
    130 	    (unsigned long) membot, (unsigned long) memtop,
    131 	    (unsigned long) (memtop - membot));
    132 }
    133