misc/efgcvt-template.c

   1 /* Compatibility functions for floating point formatting.
   2    Copyright (C) 1995-2023 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/param.h>
  23 #include <libc-lock.h>
  24 #include <math_ldbl_opt.h>
  25 #include <set-freeres.h>
  26
  27 #ifndef SPRINTF
  28 # define SPRINTF sprintf
  29 #endif
  30
  31 #define APPEND(a, b) APPEND2 (a, b)
  32 #define APPEND2(a, b) a##b
  33
  34
  35 #define FCVT_BUFFER APPEND (FUNC_PREFIX, fcvt_buffer)
  36 #define FCVT_BUFPTR APPEND (FUNC_PREFIX, fcvt_bufptr)
  37 #define ECVT_BUFFER APPEND (FUNC_PREFIX, ecvt_buffer)
  38
  39
  40 static char FCVT_BUFFER[MAXDIG];
  41 static char ECVT_BUFFER[MAXDIG];
  42 static char *FCVT_BUFPTR;
  43
  44 char *
  45 __FCVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign)
  46 {
  47   if (FCVT_BUFPTR == NULL)
  48     {
  49       if (__FCVT_R (value, ndigit, decpt, sign, FCVT_BUFFER, MAXDIG) != -1)
  50         return FCVT_BUFFER;
  51
  52       FCVT_BUFPTR = (char *) malloc (FCVT_MAXDIG);
  53       if (FCVT_BUFPTR == NULL)
  54         return FCVT_BUFFER;
  55     }
  56
  57   (void) __FCVT_R (value, ndigit, decpt, sign, FCVT_BUFPTR, FCVT_MAXDIG);
  58
  59   return FCVT_BUFPTR;
  60 }
  61
  62
  63 char *
  64 __ECVT (FLOAT_TYPE value, int ndigit, int *decpt, int *sign)
  65 {
  66   (void) __ECVT_R (value, ndigit, decpt, sign, ECVT_BUFFER, MAXDIG);
  67
  68   return ECVT_BUFFER;
  69 }
  70
  71 char *
  72 __GCVT (FLOAT_TYPE value, int ndigit, char *buf)
  73 {
  74   SPRINTF (buf, "%.*" FLOAT_FMT_FLAG "g", MIN (ndigit, NDIGIT_MAX), value);
  75   return buf;
  76 }
  77
  78 weak_alias (FCVT_BUFPTR, __EFGCVT_FREEMEM_PTR);