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8166e86e11
some internal Clanlib's function (fortunately rarely used, which allowed several clanlib-based ports live w/o it). Prompted by: alex (quite some time ago)
146 lines
3.1 KiB
C
146 lines
3.1 KiB
C
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$FreeBSD$
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--- /dev/null Wed Jan 10 00:32:20 2001
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+++ Sources/Util/fcvt.c Wed Jan 10 00:31:59 2001
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@@ -0,0 +1,139 @@
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+/* Compatibility functions for floating point formatting, reentrant versions.
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+ Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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 not,
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+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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+ Boston, MA 02111-1307, USA. */
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+
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+#include <ctype.h>
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+#include <errno.h>
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+#include <float.h>
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+#include <math.h>
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+#include <stdio.h>
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+#include <string.h>
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+#include <sys/param.h>
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+
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+extern int errno;
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+
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+#if DBL_MANT_DIG == 53
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+# define NDIGIT_MAX 17
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+#else
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+/*
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+ * See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a
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+ * compile time constant here, so we cannot use it.
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+ */
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+# error "NDIGIT_MAX must be precomputed"
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+# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * DBL_MANT_DIG + 1.0)))
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+#endif
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+#define MAXDIG (NDIGIT_MAX + 3)
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+#define signbit(x) (((x)<(0))?(1):(0))
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+
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+static char *FCVT_BUFFER[MAXDIG];
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+
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+static int fcvt_r(double value, int ndigit, int *decpt, int *sign, char *buf, \
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+ size_t len)
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+{
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+ int n, i;
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+ int left;
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+
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+ if (buf == NULL)
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+ {
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+ errno = EINVAL;
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+ return -1;
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+ }
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+
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+ left = 0;
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+ if (finite(value))
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+ {
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+ *sign = signbit(value) != 0;
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+ if (*sign)
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+ value = -value;
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+
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+ if (ndigit < 0)
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+ {
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+
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+ while (ndigit < 0)
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+ {
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+ double new_value = value * 0.1;
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+
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+ if (new_value < 1.0)
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+ {
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+ ndigit = 0;
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+ break;
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+ }
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+
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+ value = new_value;
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+ ++left;
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+ ++ndigit;
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+ }
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+ }
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+ }
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+ else
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+ *sign = 0;
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+
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+ n = snprintf(buf, len, "%.*f", MIN(ndigit, NDIGIT_MAX), value);
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+
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+ if (n >= len)
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+ return -1;
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+
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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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+
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+ if (i == 0)
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+ return 0;
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+
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+ if (i < n)
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+ {
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+ do
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+ ++i;
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+ while (i < n && !isdigit(buf[i]));
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+
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+ if (*decpt == 1 && buf[0] == '0' && value != 0.0)
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+ {
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+ --*decpt;
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+
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+ while (i < n && buf[i] == '0')
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+ {
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+ --*decpt;
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+ ++i;
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+ }
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+ }
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+
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+ memmove(&buf[MAX(*decpt, 0)], &buf[i], n - i);
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+ buf[n - (i - MAX(*decpt, 0))] = '\0';
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+ }
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+
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+ if (left)
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+ {
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+ *decpt += left;
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+ if (--len > n)
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+ {
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+ while (left-- > 0 && n < len)
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+ buf[n++] = '0';
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+ buf[n] = '\0';
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+char *fcvt(double value, int ndigit, int *decpt, int *sign)
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+{
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+ fcvt_r(value, ndigit, decpt, sign, (char *)FCVT_BUFFER, MAXDIG);
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+ return (char *)FCVT_BUFFER;
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+}
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+
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