glibc/misc/efgcvt.c

/* Compatibility functions for floating point formatting.
   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library 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.

   The GNU C Library 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 the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <stdlib.h>
#include <float.h>
#include <bits/libc-lock.h>

#ifndef FLOAT_TYPE
# define FLOAT_TYPE double
# define FUNC_PREFIX
# define FLOAT_FMT_FLAG
/* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we
   don't have log10 available in the preprocessor.  */
# define MAXDIG (DBL_DIG + 3)
#endif

#define APPEND(a, b) APPEND2 (a, b)
#define APPEND2(a, b) a##b


#define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
#define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)


static char *FCVT_BUFFER;
static char *ECVT_BUFFER;


static void
APPEND (FUNC_PREFIX, fcvt_allocate) (void)
{
  FCVT_BUFFER = (char *) malloc (MAXDIG);
}

char *
APPEND (FUNC_PREFIX, fcvt) (value, ndigit, decpt, sign)
     FLOAT_TYPE value;
     int ndigit, *decpt, *sign;
{
  __libc_once_define (static, once);
  __libc_once (once, APPEND (FUNC_PREFIX, fcvt_allocate));

  if (FCVT_BUFFER == NULL)
    /* If no core is available we don't have a chance to run the
       program successfully and so returning NULL is an acceptable
       result.  */
    return NULL;

  (void) APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign,
				       FCVT_BUFFER, MAXDIG);

  return FCVT_BUFFER;
}


static void
APPEND (FUNC_PREFIX, ecvt_allocate) (void)
{
  ECVT_BUFFER = (char *) malloc (MAXDIG);
}

char *
APPEND (FUNC_PREFIX, ecvt) (value, ndigit, decpt, sign)
     FLOAT_TYPE value;
     int ndigit, *decpt, *sign;
{
  __libc_once_define (static, once);
  __libc_once (once, APPEND (FUNC_PREFIX, ecvt_allocate));

  if (ECVT_BUFFER == NULL)
    /* If no core is available we don't have a chance to run the
       program successfully and so returning NULL is an acceptable
       result.  */
    return NULL;

  (void) APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign,
				       ECVT_BUFFER, MAXDIG);

  return ECVT_BUFFER;
}

char *
APPEND (FUNC_PREFIX, gcvt) (value, ndigit, buf)
     FLOAT_TYPE value;
     int ndigit;
     char *buf;
{
  sprintf (buf, "%.*" FLOAT_FMT_FLAG "g", ndigit, value);
  return buf;
}


/* Make sure the memory is freed if the programs ends while in
   memory-debugging mode and something actually was allocated.  */
static void
__attribute__ ((unused))
free_mem (void)
{
  if (FCVT_BUFFER != NULL)
    free (FCVT_BUFFER);
  if (ECVT_BUFFER != NULL)
    free (ECVT_BUFFER);
}

text_set_element (__libc_subfreeres, free_mem);