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 #define MAXDIG (DBL_DIG + DBL_MAX_10_EXP)
  25
  26 char *
  27 fcvt (value, ndigit, decpt, sign)
  28      double value;
  29      int ndigit, *decpt, *sign;
  30 {
  31   static char buf[MAXDIG];
  32
  33   (void) fcvt_r (value, ndigit, decpt, sign, buf, sizeof buf);
  34
  35   return buf;
  36 }
  37
  38 char *
  39 ecvt (value, ndigit, decpt, sign)
  40      double value;
  41      int ndigit, *decpt, *sign;
  42 {
  43   static char buf[MAXDIG];
  44
  45   (void) ecvt_r (value, ndigit, decpt, sign, buf, sizeof buf);
  46
  47   return buf;
  48 }
  49
  50 char *
  51 gcvt (value, ndigit, buf)
  52      double value;
  53      int ndigit;
  54      char *buf;
  55 {
  56   sprintf (buf, "%.*g", ndigit, value);
  57   return buf;
  58 }