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mem.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 1998, 2000, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate dynamic memory
 */

#include <ac/errno.h>
#include <ac/stddef.h>
#include <ac/stdlib.h>
#include <ac/string.h>

#include <error.h>
#include <mem.h>


/*
 * NAME
 *    memory_error - diagnostic
 *
 * SYNOPSIS
 *    void memory_error(void);
 *
 * DESCRIPTION
 *    The memory_error function is used to report fatal problems with the
 *    memory allocator.
 *
 * RETURNS
 *    The memory_error function does not return.
 */

static void
memory_error(void)
{
#ifdef DEBUG
      nerror_raw("memory allocator");
      abort();
#else
      nfatal_raw("memory allocator");
#endif
}


/*
 * NAME
 *    mem_alloc - allocate and clear memory
 *
 * SYNOPSIS
 *    char *mem_alloc(size_t n);
 *
 * DESCRIPTION
 *    Mem_alloc uses malloc to allocate the required sized chunk of memory.
 *    If any error is returned from malloc() an fatal diagnostic is issued.
 *    The memory is zeroed befor it is returned.
 *
 * CAVEAT
 *    It is the responsibility of the caller to ensure that the space is
 *    freed when finished with, by a call to free().
 */

void *
mem_alloc(size_t n)
{
      void        *p;

      if (n < 1)
            n = 1;
      errno = ENOMEM;
      p = malloc(n);
      if (!p)
            memory_error();
      return p;
}


/*
 * NAME
 *    mem_alloc_clear - allocate and clear memory
 *
 * SYNOPSIS
 *    char *mem_alloc_clear(size_t n);
 *
 * DESCRIPTION
 *    Mem_alloc_clear uses malloc to allocate the required sized chunk of memory.
 *    If any error is returned from malloc() an fatal diagnostic is issued.
 *    The memory is zeroed befor it is returned.
 *
 * CAVEAT
 *    It is the responsibility of the caller to ensure that the space is
 *    freed when finished with, by a call to free().
 */

void *
mem_alloc_clear(size_t n)
{
      void        *p;

      p = mem_alloc(n);
      memset(p, 0, n);
      return p;
}


void *
mem_change_size(void *p, size_t n)
{
      if (n < 1)
            n = 1;
      errno = ENOMEM;
      if (!p)
            p = malloc(n);
      else
            p = realloc(p, n);
      if (!p)
            memory_error();
      return p;
}


void
mem_free(void *p)
{
      free(p);
}


char *
mem_copy_string(const char *s)
{
      char        *cp;

      cp = mem_alloc(strlen(s) + 1);
      strcpy(cp, s);
      return cp;
}

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