/* memory allocation routines with error checking.

   Copyright (C) 1989-2025 Free Software Foundation, Inc.

This file is part of the libiberty library.

Libiberty is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

Libiberty 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with libiberty; see the file COPYING.LIB.  If

not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.  */

/*

@deftypefn Replacement void* xmalloc (size_t)

Allocate memory without fail.  If @code{malloc} fails, this will print

a message to @code{stderr} (using the name set by

@code{xmalloc_set_program_name},

if any) and then call @code{xexit}.  Note that it is therefore safe for

a program to contain @code{#define malloc xmalloc} in its source.

@end deftypefn

@deftypefn Replacement void* xrealloc (void *@var{ptr}, size_t @var{size})

Reallocate memory without fail.  This routine functions like @code{realloc},

but will behave the same as @code{xmalloc} if memory cannot be found.

@end deftypefn

@deftypefn Replacement void* xcalloc (size_t @var{nelem}, size_t @var{elsize})

Allocate memory without fail, and set it to zero.  This routine functions

like @code{calloc}, but will behave the same as @code{xmalloc} if memory

cannot be found.

@end deftypefn

@deftypefn Replacement void xmalloc_set_program_name (const char *@var{name})

You can use this to set the name of the program used by

@code{xmalloc_failed} when printing a failure message.

@end deftypefn

@deftypefn Replacement void xmalloc_failed (size_t)

This function is not meant to be called by client code, and is listed

here for completeness only.  If any of the allocation routines fail, this

function will be called to print an error message and terminate execution.

@end deftypefn

*/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "ansidecl.h"

#include "libiberty.h"

#include "environ.h"

#include <stdio.h>

#include <stddef.h>

#if VMS

#include <stdlib.h>

#include <unixlib.h>

#else

/* For systems with larger pointers than ints, these must be declared.  */

#  if HAVE_STDLIB_H && HAVE_UNISTD_H && HAVE_DECL_MALLOC \

      && HAVE_DECL_REALLOC && HAVE_DECL_CALLOC && HAVE_DECL_SBRK

#    include <stdlib.h>

#    include <unistd.h>

#  else

#    ifdef __cplusplus

extern "C" {

#    endif /* __cplusplus */

void *malloc (size_t);

void *realloc (void *, size_t);

void *calloc (size_t, size_t);

#ifdef HAVE_SBRK

void *sbrk (ptrdiff_t);

#endif

#    ifdef __cplusplus

}

#    endif /* __cplusplus */

#  endif /* HAVE_STDLIB_H ...  */

#endif /* VMS */

/* The program name if set.  */

static const char *name = "";

#ifdef HAVE_SBRK

/* The initial sbrk, set when the program name is set. Not used for win32

   ports other than cygwin32.  */

static char *first_break = NULL;

#endif /* HAVE_SBRK */

void

xmalloc_set_program_name (const char *s)

{

  name = s;

#ifdef HAVE_SBRK

  /* Win32 ports other than cygwin32 don't have brk() */

  if (first_break == NULL)

    first_break = (char *) sbrk (0);

#endif /* HAVE_SBRK */

}

void

xmalloc_failed (size_t size)

{

#ifdef HAVE_SBRK

  size_t allocated;

  if (first_break != NULL)

    allocated = (char *) sbrk (0) - first_break;

  else

    allocated = (char *) sbrk (0) - (char *) &environ;

  fprintf (stderr,

     "\n%s%sout of memory allocating %lu bytes after a total of %lu bytes\n",

     name, *name ? ": " : "",

     (unsigned long) size, (unsigned long) allocated);

#else /* HAVE_SBRK */

  fprintf (stderr,

     "\n%s%sout of memory allocating %lu bytes\n",

     name, *name ? ": " : "",

     (unsigned long) size);

#endif /* HAVE_SBRK */

  xexit (1);

}  

void *

xmalloc (size_t size)

{

  void *newmem;

  if (size == 0)

    size = 1;

  newmem = malloc (size);

  if (!newmem)

    xmalloc_failed (size);

  return (newmem);

}

void *

xcalloc (size_t nelem, size_t elsize)

{

  void *newmem;

  if (nelem == 0 || elsize == 0)

    nelem = elsize = 1;

  newmem = calloc (nelem, elsize);

  if (!newmem)

    xmalloc_failed (nelem * elsize);

  return (newmem);

}

void *

xrealloc (void *oldmem, size_t size)

{

  void *newmem;

  if (size == 0)

    size = 1;

  if (!oldmem)

    newmem = malloc (size);

  else

    newmem = realloc (oldmem, size);

  if (!newmem)

    xmalloc_failed (size);

  return (newmem);

}