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alloc.c revision 1.6 
      1 /*	$NetBSD: alloc.c,v 1.6 1995/03/21 09:02:23 cgd 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 #ifndef lint
     37 #if 0
     38 static char sccsid[] = "@(#)alloc.c	8.1 (Berkeley) 5/31/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: alloc.c,v 1.6 1995/03/21 09:02:23 cgd Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 #include <unistd.h>
     46 #include <stdlib.h>
     47 #if __STDC__
     48 # include <stdarg.h>
     49 #else
     50 # include <varargs.h>
     51 #endif
     52 
     53 #include "csh.h"
     54 #include "extern.h"
     55 
     56 char   *memtop = NULL;		/* PWP: top of current memory */
     57 char   *membot = NULL;		/* PWP: bottom of allocatable memory */
     58 
     59 ptr_t
     60 Malloc(n)
     61     size_t  n;
     62 {
     63     ptr_t   ptr;
     64 
     65     if (membot == NULL)
     66 	memtop = membot = sbrk(0);
     67     if ((ptr = malloc(n)) == (ptr_t) 0) {
     68 	child++;
     69 	stderror(ERR_NOMEM);
     70     }
     71     return (ptr);
     72 }
     73 
     74 ptr_t
     75 Realloc(p, n)
     76     ptr_t   p;
     77     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(s, n)
     92     size_t  s, n;
     93 {
     94     ptr_t   ptr;
     95 
     96     if (membot == NULL)
     97 	memtop = membot = sbrk(0);
     98     if ((ptr = calloc(s, n)) == (ptr_t) 0) {
     99 	child++;
    100 	stderror(ERR_NOMEM);
    101     }
    102 
    103     return (ptr);
    104 }
    105 
    106 void
    107 Free(p)
    108     ptr_t   p;
    109 {
    110     if (p)
    111 	free(p);
    112 }
    113 
    114 /*
    115  * mstats - print out statistics about malloc
    116  *
    117  * Prints two lines of numbers, one showing the length of the free list
    118  * for each size category, the second showing the number of mallocs -
    119  * frees for each size category.
    120  */
    121 void
    122 /*ARGSUSED*/
    123 showall(v, t)
    124     Char **v;
    125     struct command *t;
    126 {
    127     memtop = (char *) sbrk(0);
    128     (void) fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
    129 	    (unsigned long) membot, (unsigned long) memtop, memtop - membot);
    130 }
    131