Added a reference to gdtoa, for doing expected conversion of double to amount.

1 files changed, 199 insertions, 0 deletions

diff --git a/gdtoa/strtordd.c b/gdtoa/strtordd.c
new file mode 100644
index 00000000..9c2b46e6
--- /dev/null
+++ b/gdtoa/strtordd.c
@@ -0,0 +1,199 @@
+/****************************************************************
+
+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 (dmg at acm dot org,
+ * with " at " changed at "@" and " dot " changed to ".").	*/
+
+#include "gdtoaimp.h"
+
+ void
+#ifdef KR_headers
+ULtodd(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
+#else
+ULtodd(ULong *L, ULong *bits, Long exp, int k)
+#endif
+{
+	int i, j;
+
+	switch(k & STRTOG_Retmask) {
+	  case STRTOG_NoNumber:
+	  case STRTOG_Zero:
+		L[0] = L[1] = L[2] = L[3] = 0;
+		break;
+
+	  case STRTOG_Normal:
+		L[_1] = (bits[1] >> 21 | bits[2] << 11) & (ULong)0xffffffffL;
+		L[_0] = bits[2] >> 21 | bits[3] << 11 & 0xfffff
+			  | exp + 0x3ff + 105 << 20;
+		exp += 0x3ff + 52;
+		if (bits[1] &= 0x1fffff) {
+			i = hi0bits(bits[1]) - 11;
+			if (i >= exp) {
+				i = exp - 1;
+				exp = 0;
+				}
+			else
+				exp -= i;
+			if (i > 0) {
+				bits[1] = bits[1] << i | bits[0] >> 32-i;
+				bits[0] = bits[0] << i & (ULong)0xffffffffL;
+				}
+			}
+		else if (bits[0]) {
+			i = hi0bits(bits[0]) + 21;
+			if (i >= exp) {
+				i = exp - 1;
+				exp = 0;
+				}
+			else
+				exp -= i;
+			if (i < 32) {
+				bits[1] = bits[0] >> 32 - i;
+				bits[0] = bits[0] << i & (ULong)0xffffffffL;
+				}
+			else {
+				bits[1] = bits[0] << i - 32;
+				bits[0] = 0;
+				}
+			}
+		else {
+			L[2] = L[3] = 0;
+			break;
+			}
+		L[2+_1] = bits[0];
+		L[2+_0] = bits[1] & 0xfffff | exp << 20;
+		break;
+
+	  case STRTOG_Denormal:
+		if (bits[3])
+			goto nearly_normal;
+		if (bits[2])
+			goto partly_normal;
+		if (bits[1] & 0xffe00000)
+			goto hardly_normal;
+		/* completely denormal */
+		L[2] = L[3] = 0;
+		L[_1] = bits[0];
+		L[_0] = bits[1];
+		break;
+
+	  nearly_normal:
+		i = hi0bits(bits[3]) - 11;	/* i >= 12 */
+		j = 32 - i;
+		L[_0] = (bits[3] << i | bits[2] >> j) & 0xfffff
+			| 65 - i << 20;
+		L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL;
+		L[2+_0] = bits[1] & ((ULong)1L << j) - 1;
+		L[2+_1] = bits[0];
+		break;
+
+	  partly_normal:
+		i = hi0bits(bits[2]) - 11;
+		if (i < 0) {
+			j = -i;
+			i += 32;
+			L[_0] = bits[2] >> j & 0xfffff | (33 + j) << 20;
+			L[_1] = (bits[2] << i | bits[1] >> j) & 0xffffffffL;
+			L[2+_0] = bits[1] & ((ULong)1L << j) - 1;
+			L[2+_1] = bits[0];
+			break;
+			}
+		if (i == 0) {
+			L[_0] = bits[2] & 0xfffff | 33 << 20;
+			L[_1] = bits[1];
+			L[2+_0] = 0;
+			L[2+_1] = bits[0];
+			break;
+			}
+		j = 32 - i;
+		L[_0] = (bits[2] << i | bits[1] >> j) & 0xfffff
+				| j + 1 << 20;
+		L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL;
+		L[2+_0] = 0;
+		L[2+_1] = bits[0] & (1L << j) - 1;
+		break;
+
+	  hardly_normal:
+		j = 11 - hi0bits(bits[1]);
+		i = 32 - j;
+		L[_0] = bits[1] >> j & 0xfffff | j + 1 << 20;
+		L[_1] = (bits[1] << i | bits[0] >> j) & 0xffffffffL;
+		L[2+_0] = 0;
+		L[2+_1] = bits[0] & ((ULong)1L << j) - 1;
+		break;
+
+	  case STRTOG_Infinite:
+		L[_0] = L[2+_0] = 0x7ff00000;
+		L[_1] = L[2+_1] = 0;
+		break;
+
+	  case STRTOG_NaN:
+		L[0] = L[2] = d_QNAN0;
+		L[1] = L[3] = d_QNAN1;
+		break;
+
+	  case STRTOG_NaNbits:
+		L[_1] = (bits[1] >> 21 | bits[2] << 11) & (ULong)0xffffffffL;
+		L[_0] = bits[2] >> 21 | bits[3] << 11
+			  | (ULong)0x7ff00000L;
+		L[2+_1] = bits[0];
+		L[2+_0] = bits[1] | (ULong)0x7ff00000L;
+	  }
+	if (k & STRTOG_Neg) {
+		L[_0] |= 0x80000000L;
+		L[2+_0] |= 0x80000000L;
+		}
+	}
+
+ int
+#ifdef KR_headers
+strtordd(s, sp, rounding, dd) CONST char *s; char **sp; int rounding; double *dd;
+#else
+strtordd(CONST char *s, char **sp, int rounding, double *dd)
+#endif
+{
+#ifdef Sudden_Underflow
+	static FPI fpi0 = { 106, 1-1023, 2046-1023-106+1, 1, 1 };
+#else
+	static FPI fpi0 = { 106, 1-1023-53+1, 2046-1023-106+1, 1, 0 };
+#endif
+	FPI *fpi, fpi1;
+	ULong bits[4];
+	Long exp;
+	int k;
+
+	fpi = &fpi0;
+	if (rounding != FPI_Round_near) {
+		fpi1 = fpi0;
+		fpi1.rounding = rounding;
+		fpi = &fpi1;
+		}
+	k = strtodg(s, sp, fpi, &exp, bits);
+	ULtodd((ULong*)dd, bits, exp, k);
+	return k;
+	}