misc/efgcvt.c

   1 /* [efg]cvt -- compatibility functions for floating point formatting.
   2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <float.h>
  23
  24 #ifndef FLOAT_TYPE
  25 #define FLOAT_TYPE double
  26 #define FUNC_PREFIX
  27 #define FLOAT_FMT_FLAG
  28 #define MAXDIG (DBL_DIG + DBL_MAX_10_EXP)
  29 #endif
  30
  31 #define APPEND(a, b) APPEND2 (a, b)
  32 #define APPEND2(a, b) a##b
  33
  34
  35 char *
  36 APPEND (FUNC_PREFIX, fcvt) (value, ndigit, decpt, sign)
  37      FLOAT_TYPE value;
  38      int ndigit, *decpt, *sign;
  39 {
  40   static char buf[MAXDIG];
  41
  42   (void) fcvt_r (value, ndigit, decpt, sign, buf, sizeof buf);
  43
  44   return buf;
  45 }
  46
  47 char *
  48 APPEND (FUNC_PREFIX, ecvt) (value, ndigit, decpt, sign)
  49      FLOAT_TYPE value;
  50      int ndigit, *decpt, *sign;
  51 {
  52   static char buf[MAXDIG];
  53
  54   (void) ecvt_r (value, ndigit, decpt, sign, buf, sizeof buf);
  55
  56   return buf;
  57 }
  58
  59 char *
  60 APPEND (FUNC_PREFIX, gcvt) (value, ndigit, buf)
  61      FLOAT_TYPE value;
  62      int ndigit;
  63      char *buf;
  64 {
  65   sprintf (buf, "%.*" FLOAT_FMT_FLAG "g", ndigit, value);
  66   return buf;
  67 }