73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* [efg]cvt -- compatibility functions for floating point formatting
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <math.h>
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char *
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fcvt (value, ndigit, decpt, sign)
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double value;
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int ndigit, *decpt, *sign;
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{
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static char buf[100];
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int n, i;
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*sign = value < 0.0;
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if (*sign)
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value = - value;
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n = snprintf (buf, sizeof buf, "%.*f", ndigit, value);
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if (n < 0)
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return NULL;
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i = 0;
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while (i < n && isdigit (buf[i]))
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++i;
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*decpt = i;
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do
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++i;
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while (! isdigit (buf[i]));
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memmove (&buf[i - *decpt], buf, n - (i - *decpt));
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return buf;
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}
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char *
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ecvt (value, ndigit, decpt, sign)
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double value;
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int ndigit, *decpt, *sign;
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{
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ndigit -= (int) floor (log10 (value));
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if (ndigit < 0)
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ndigit = 0;
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return fcvt (value, ndigit, decpt, sign);
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}
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char *
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gcvt (value, ndigit, buf)
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double value;
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int ndigit;
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char *buf;
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{
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sprintf (buf, "%.*g", ndigit, value);
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return buf;
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}
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