Initial import of David Gay's gdtoa library for conversion between

strings and floating point.

1 files changed, 114 insertions, 0 deletions

diff --git a/contrib/gdtoa/g_xLfmt.c b/contrib/gdtoa/g_xLfmt.c
new file mode 100644
index 0000000..fc17643
--- /dev/null
+++ b/contrib/gdtoa/g_xLfmt.c
@@ -0,0 +1,114 @@
+/****************************************************************
+
+The author of this software is David M. Gay.
+
+Copyright (C) 1998 by Lucent Technologies
+All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appear in all
+copies and that both that the copyright notice and this
+permission notice and warranty disclaimer appear in supporting
+documentation, and that the name of Lucent or any of its entities
+not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
+IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
+SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+
+****************************************************************/
+
+/* Please send bug reports to
+	David M. Gay
+	Bell Laboratories, Room 2C-463
+	600 Mountain Avenue
+	Murray Hill, NJ 07974-0636
+	U.S.A.
+	dmg@bell-labs.com
+ */
+
+#include "gdtoaimp.h"
+
+#undef _0
+#undef _1
+
+/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
+
+#ifdef IEEE_MC68k
+#define _0 0
+#define _1 1
+#define _2 2
+#endif
+#ifdef IEEE_8087
+#define _0 2
+#define _1 1
+#define _2 0
+#endif
+
+ char*
+#ifdef KR_headers
+g_xLfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; unsigned bufsize;
+#else
+g_xLfmt(char *buf, void *V, int ndig, unsigned bufsize)
+#endif
+{
+	static FPI fpi = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 };
+	char *b, *s, *se;
+	ULong bits[2], *L, sign;
+	int decpt, ex, i, mode;
+
+	if (ndig < 0)
+		ndig = 0;
+	if (bufsize < ndig + 10)
+		return 0;
+
+	L = (ULong*)V;
+	sign = L[_0] & 0x80000000L;
+	bits[1] = L[_1];
+	bits[0] = L[_2];
+	if ( (ex = (L[_0] >> 16) & 0x7fff) !=0) {
+		if (ex == 0x7fff) {
+			/* Infinity or NaN */
+			if (bits[0] | bits[1])
+				b = strcp(buf, "NaN");
+			else {
+				b = buf;
+				if (sign)
+					*b++ = '-';
+				b = strcp(b, "Infinity");
+				}
+			return b;
+			}
+		i = STRTOG_Normal;
+		}
+	else if (bits[0] | bits[1]) {
+		i = STRTOG_Denormal;
+		}
+	else {
+		b = buf;
+#ifndef IGNORE_ZERO_SIGN
+		if (sign)
+			*b++ = '-';
+#endif
+		*b++ = '0';
+		*b = 0;
+		return b;
+		}
+	ex -= 0x3fff + 63;
+	mode = 2;
+	if (ndig <= 0) {
+		if (bufsize < 32)
+			return 0;
+		mode = 0;
+		}
+	s = gdtoa(&fpi, ex, bits, &i, mode, ndig, &decpt, &se);
+	return g__fmt(buf, s, se, decpt, sign);
+	}