misc/efgcvt.c

   1 /* Compatibility functions for floating point formatting.
   2    Copyright (C) 1995, 1996, 1997 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 not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <float.h>
  23 #include <bits/libc-lock.h>
  24
  25 #ifndef FLOAT_TYPE
  26 # define FLOAT_TYPE double
  27 # define FUNC_PREFIX
  28 # define FLOAT_FMT_FLAG
  29 /* Actually we have to write (DBL_DIG + log10 (DBL_MAX_10_EXP)) but we
  30    don't have log10 available in the preprocessor.  */
  31 # define MAXDIG (DBL_DIG + 3)
  32 #endif
  33
  34 #define APPEND(a, b) APPEND2 (a, b)
  35 #define APPEND2(a, b) a##b
  36
  37
  38 #define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
  39 #define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)
  40
  41
  42 static char *FCVT_BUFFER;
  43 static char *ECVT_BUFFER;
  44
  45
  46 static void
  47 APPEND (FUNC_PREFIX, fcvt_allocate) (void)
  48 {
  49   FCVT_BUFFER = (char *) malloc (MAXDIG);
  50 }
  51
  52 char *
  53 APPEND (FUNC_PREFIX, fcvt) (value, ndigit, decpt, sign)
  54      FLOAT_TYPE value;
  55      int ndigit, *decpt, *sign;
  56 {
  57   __libc_once_define (static, once);
  58   __libc_once (once, APPEND (FUNC_PREFIX, fcvt_allocate));
  59
  60   if (FCVT_BUFFER == NULL)
  61     /* If no core is available we don't have a chance to run the
  62        program successfully and so returning NULL is an acceptable
  63        result.  */
  64     return NULL;
  65
  66   (void) APPEND (FUNC_PREFIX, fcvt_r) (value, ndigit, decpt, sign,
  67                                        FCVT_BUFFER, MAXDIG);
  68
  69   return FCVT_BUFFER;
  70 }
  71
  72
  73 static void
  74 APPEND (FUNC_PREFIX, ecvt_allocate) (void)
  75 {
  76   ECVT_BUFFER = (char *) malloc (MAXDIG);
  77 }
  78
  79 char *
  80 APPEND (FUNC_PREFIX, ecvt) (value, ndigit, decpt, sign)
  81      FLOAT_TYPE value;
  82      int ndigit, *decpt, *sign;
  83 {
  84   __libc_once_define (static, once);
  85   __libc_once (once, APPEND (FUNC_PREFIX, ecvt_allocate));
  86
  87   if (ECVT_BUFFER == NULL)
  88     /* If no core is available we don't have a chance to run the
  89        program successfully and so returning NULL is an acceptable
  90        result.  */
  91     return NULL;
  92
  93   (void) APPEND (FUNC_PREFIX, ecvt_r) (value, ndigit, decpt, sign,
  94                                        ECVT_BUFFER, MAXDIG);
  95
  96   return ECVT_BUFFER;
  97 }
  98
  99 char *
 100 APPEND (FUNC_PREFIX, gcvt) (value, ndigit, buf)
 101      FLOAT_TYPE value;
 102      int ndigit;
 103      char *buf;
 104 {
 105   sprintf (buf, "%.*" FLOAT_FMT_FLAG "g", ndigit, value);
 106   return buf;
 107 }
 108
 109
 110 /* Make sure the memory is freed if the programs ends while in
 111    memory-debugging mode and something actually was allocated.  */
 112 static void
 113 __attribute__ ((unused))
 114 free_mem (void)
 115 {
 116   if (FCVT_BUFFER != NULL)
 117     free (FCVT_BUFFER);
 118   if (ECVT_BUFFER != NULL)
 119     free (ECVT_BUFFER);
 120 }
 121
 122 text_set_element (__libc_subfreeres, free_mem);