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authorJohn Wiegley <johnw@newartisans.com>2007-04-15 12:55:22 +0000
committerJohn Wiegley <johnw@newartisans.com>2008-04-13 03:35:33 -0400
commitb27b34a76fa16fcb96632a5bf245f3876183c479 (patch)
treefe386b51289569218b776e0d7453b161f071db70 /gdtoa/strtorf.c
parentb307f741c493652d64a6dde1df424c07eb698cb4 (diff)
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Added a reference to gdtoa, for doing expected conversion of double to amount.
Diffstat (limited to 'gdtoa/strtorf.c')
-rw-r--r--gdtoa/strtorf.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/gdtoa/strtorf.c b/gdtoa/strtorf.c
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+/****************************************************************
+
+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
+ULtof(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
+#else
+ULtof(ULong *L, ULong *bits, Long exp, int k)
+#endif
+{
+ switch(k & STRTOG_Retmask) {
+ case STRTOG_NoNumber:
+ case STRTOG_Zero:
+ *L = 0;
+ break;
+
+ case STRTOG_Normal:
+ case STRTOG_NaNbits:
+ L[0] = bits[0] & 0x7fffff | exp + 0x7f + 23 << 23;
+ break;
+
+ case STRTOG_Denormal:
+ L[0] = bits[0];
+ break;
+
+ case STRTOG_Infinite:
+ L[0] = 0x7f800000;
+ break;
+
+ case STRTOG_NaN:
+ L[0] = f_QNAN;
+ }
+ if (k & STRTOG_Neg)
+ L[0] |= 0x80000000L;
+ }
+
+ int
+#ifdef KR_headers
+strtorf(s, sp, rounding, f) CONST char *s; char **sp; int rounding; float *f;
+#else
+strtorf(CONST char *s, char **sp, int rounding, float *f)
+#endif
+{
+ static FPI fpi0 = { 24, 1-127-24+1, 254-127-24+1, 1, SI };
+ FPI *fpi, fpi1;
+ ULong bits[1];
+ 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);
+ ULtof((ULong*)f, bits, exp, k);
+ return k;
+ }