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

strings and floating point.

1 files changed, 100 insertions, 0 deletions

diff --git a/contrib/gdtoa/strtopxL.c b/contrib/gdtoa/strtopxL.c
new file mode 100644
index 0000000..95fd3d5
--- /dev/null
+++ b/contrib/gdtoa/strtopxL.c
@@ -0,0 +1,100 @@
+/****************************************************************
+
+The author of this software is David M. Gay.
+
+Copyright (C) 1998, 2000 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
+
+ int
+#ifdef KR_headers
+strtopxL(s, sp, V) CONST char *s; char **sp; void *V;
+#else
+strtopxL(CONST char *s, char **sp, void *V)
+#endif
+{
+#ifdef Sudden_Underflow
+	static FPI fpi = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 1 };
+#else
+	static FPI fpi = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 };
+#endif
+	ULong bits[2];
+	Long exp;
+	int k;
+	ULong *L = (ULong*)V;
+
+	k = strtodg(s, sp, &fpi, &exp, bits);
+	switch(k & STRTOG_Retmask) {
+	  case STRTOG_NoNumber:
+	  case STRTOG_Zero:
+		L[0] = L[1] = L[2] = 0;
+		break;
+
+	  case STRTOG_Normal:
+	  case STRTOG_Denormal:
+	  case STRTOG_NaNbits:
+		L[_2] = bits[0];
+		L[_1] = bits[1];
+		L[_0] = (exp + 0x3fff + 63) << 16;
+		break;
+
+	  case STRTOG_Infinite:
+		L[_0] = 0x7fff << 16;
+		L[_1] = L[_2] = 0;
+		break;
+
+	  case STRTOG_NaN:
+		L[_0] = 0x7fff << 16;
+		L[_1] = L[_2] = (ULong)-1;
+	  }
+	if (k & STRTOG_Neg)
+		L[_0] |= 0x80000000L;
+	return k;
+	}