| /* [efg]cvt -- compatibility functions for floating point formatting, |
| reentrent versions. |
| Copyright (C) 1995, 1996 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 <errno.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <math.h> |
| #include <stdlib.h> |
| |
| int |
| fcvt_r (value, ndigit, decpt, sign, buf, len) |
| double value; |
| int ndigit, *decpt, *sign; |
| char *buf; |
| size_t len; |
| { |
| int n, i; |
| |
| if (buf == NULL) |
| { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| *sign = value < 0.0; |
| if (*sign) |
| value = - value; |
| |
| n = snprintf (buf, len, "%.*f", ndigit, value); |
| if (n < 0) |
| return -1; |
| |
| i = 0; |
| while (i < n && isdigit (buf[i])) |
| ++i; |
| *decpt = i; |
| do |
| ++i; |
| while (! isdigit (buf[i])); |
| memmove (&buf[i - *decpt], buf, n - (i - *decpt)); |
| |
| return 0; |
| } |
| |
| weak_symbol (floor) weak_symbol (log10) weak_symbol (fabs) |
| |
| int |
| ecvt_r (value, ndigit, decpt, sign, buf, len) |
| double value; |
| int ndigit, *decpt, *sign; |
| char *buf; |
| size_t len; |
| { |
| if (&log10) |
| { |
| /* Use the reasonable code if -lm is included. */ |
| ndigit -= (int) floor (log10 (fabs (value))); |
| if (ndigit < 0) |
| ndigit = 0; |
| } |
| else |
| { |
| /* Slow code that doesn't require -lm functions. */ |
| double d; |
| for (d = value < 0.0 ? - value : value; |
| ndigit > 0 && d >= 10.0; |
| d *= 0.1) |
| --ndigit; |
| } |
| |
| return fcvt_r (value, ndigit, decpt, sign, buf, len); |
| } |