update for the 4.4BSD manuals

[unix-history] / usr / src / bin / csh / alloc.c

/*-
* Copyright (c) 1983, 1991, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)alloc.c     8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#if __STDC__
# include <stdarg.h>
#else
# include <varargs.h>
#endif

#include "csh.h"
#include "extern.h"

char   *memtop = NULL;          /* PWP: top of current memory */
char   *membot = NULL;          /* PWP: bottom of allocatable memory */

ptr_t
Malloc(n)
   size_t  n;
{
   ptr_t   ptr;

   if (membot == NULL)
       memtop = membot = sbrk(0);
   if ((ptr = malloc(n)) == (ptr_t) 0) {
       child++;
       stderror(ERR_NOMEM);
   }
   return (ptr);
}

ptr_t
Realloc(p, n)
   ptr_t   p;
   size_t  n;
{
   ptr_t   ptr;

   if (membot == NULL)
       memtop = membot = sbrk(0);
   if ((ptr = realloc(p, n)) == (ptr_t) 0) {
       child++;
       stderror(ERR_NOMEM);
   }
   return (ptr);
}

ptr_t
Calloc(s, n)
   size_t  s, n;
{
   ptr_t   ptr;

   if (membot == NULL)
       memtop = membot = sbrk(0);
   if ((ptr = calloc(s, n)) == (ptr_t) 0) {
       child++;
       stderror(ERR_NOMEM);
   }

   return (ptr);
}

void
Free(p)
   ptr_t   p;
{
   if (p)
       free(p);
}

/*
* mstats - print out statistics about malloc
*
* Prints two lines of numbers, one showing the length of the free list
* for each size category, the second showing the number of mallocs -
* frees for each size category.
*/
void
/*ARGSUSED*/
showall(v, t)
   Char **v;
   struct command *t;
{
   memtop = (char *) sbrk(0);
   (void) fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
           (unsigned long) membot, (unsigned long) memtop, memtop - membot);
}