/* Decimal context module for the decNumber C Library.
- Copyright (C) 2005, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2007, 2009 Free Software Foundation, Inc.
Contributed by IBM Corporation. Author Mike Cowlishaw.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
+ Software Foundation; either version 3, or (at your option) any later
version.
- In addition to the permissions in the GNU General Public License,
- the Free Software Foundation gives you unlimited permission to link
- the compiled version of this file into combinations with other
- programs, and to distribute those combinations without any
- restriction coming from the use of this file. (The General Public
- License restrictions do apply in other respects; for example, they
- cover modification of the file, and distribution when not linked
- into a combine executable.)
-
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
- You should have received a copy of the GNU General Public License
- along with GCC; see the file COPYING. If not, write to the Free
- Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
/* ------------------------------------------------------------------ */
/* Decimal Context module */
/* ------------------------------------------------------------------ */
#include <string.h> /* for strcmp */
+#ifdef DECCHECK
#include <stdio.h> /* for printf if DECCHECK */
-#include "config.h" /* for GCC definitions */
-#include "decContext.h" /* context and base types */
+#endif
+#include "dconfig.h" /* for GCC definitions */
+#include "decContext.h" /* context and base types */
#include "decNumberLocal.h" /* decNumber local types, etc. */
-#if DECCHECK
/* compile-time endian tester [assumes sizeof(Int)>1] */
static const Int mfcone=1; /* constant 1 */
-static const Flag *mfctop=(Flag *)&mfcone; /* -> top byte */
+static const Flag *mfctop=(const Flag *)&mfcone; /* -> top byte */
#define LITEND *mfctop /* named flag; 1=little-endian */
-#endif
/* ------------------------------------------------------------------ */
/* round-for-reround digits */
/* */
/* context is the context structure to be queried */
/* mask indicates the bits to be cleared (the status bit that */
-/* corresponds to each 1 bit in the mask is cleared) */
+/* corresponds to each 1 bit in the mask is cleared) */
/* returns context */
/* */
/* No error is possible. */
/* context is the structure to be initialized */
/* kind selects the required set of default values, one of: */
/* DEC_INIT_BASE -- select ANSI X3-274 defaults */
-/* DEC_INIT_DECIMAL32 -- select IEEE 754r defaults, 32-bit */
-/* DEC_INIT_DECIMAL64 -- select IEEE 754r defaults, 64-bit */
-/* DEC_INIT_DECIMAL128 -- select IEEE 754r defaults, 128-bit */
+/* DEC_INIT_DECIMAL32 -- select IEEE 754 defaults, 32-bit */
+/* DEC_INIT_DECIMAL64 -- select IEEE 754 defaults, 64-bit */
+/* DEC_INIT_DECIMAL128 -- select IEEE 754 defaults, 128-bit */
/* For any other value a valid context is returned, but with */
/* Invalid_operation set in the status field. */
/* returns a context structure with the appropriate initial values. */
break;
case DEC_INIT_DECIMAL32:
context->digits=7; /* digits */
- context->emax=96; /* Emax */
+ context->emax=96; /* Emax */
context->emin=-95; /* Emin */
context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
- context->traps=0; /* no traps set */
- context->clamp=1; /* clamp exponents */
+ context->traps=0; /* no traps set */
+ context->clamp=1; /* clamp exponents */
#if DECSUBSET
context->extended=1; /* set */
#endif
context->emax=384; /* Emax */
context->emin=-383; /* Emin */
context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
- context->traps=0; /* no traps set */
- context->clamp=1; /* clamp exponents */
+ context->traps=0; /* no traps set */
+ context->clamp=1; /* clamp exponents */
#if DECSUBSET
context->extended=1; /* set */
#endif
context->emax=6144; /* Emax */
context->emin=-6143; /* Emin */
context->round=DEC_ROUND_HALF_EVEN; /* 0.5 to nearest even */
- context->traps=0; /* no traps set */
- context->clamp=1; /* clamp exponents */
+ context->traps=0; /* no traps set */
+ context->clamp=1; /* clamp exponents */
#if DECSUBSET
context->extended=1; /* set */
#endif
decContextSetStatus(context, DEC_Invalid_operation); /* trap */
}
- #if DECCHECK
- if (LITEND!=DECLITEND) {
- const char *adj;
- if (LITEND) adj="little";
- else adj="big";
- printf("Warning: DECLITEND is set to %d, but this computer appears to be %s-endian\n",
- DECLITEND, adj);
- }
- #endif
return context;} /* decContextDefault */
/* ------------------------------------------------------------------ */
} /* decContextGetRounding */
/* ------------------------------------------------------------------ */
-/* decContextGetStatus -- return current status */
+/* decContextGetStatus -- return current status */
/* */
/* context is the context structure to be queried */
/* returns status */
/* decContextRestoreStatus -- restore bits in current status */
/* */
/* context is the context structure to be updated */
-/* newstatus is the source for the bits to be restored */
-/* mask indicates the bits to be restored (the status bit that */
+/* newstatus is the source for the bits to be restored */
+/* mask indicates the bits to be restored (the status bit that */
/* corresponds to each 1 bit in the mask is set to the value of */
/* the correspnding bit in newstatus) */
/* returns context */
/* */
/* returns the context structure, unless the string is equal to */
/* DEC_Condition_MU or is not recognized. In these cases NULL is */
-/* returned. */
+/* returned. */
/* ------------------------------------------------------------------ */
decContext * decContextSetStatusFromString(decContext *context,
const char *string) {
/* */
/* returns the context structure, unless the string is equal to */
/* DEC_Condition_MU or is not recognized. In these cases NULL is */
-/* returned. */
+/* returned. */
/* ------------------------------------------------------------------ */
decContext * decContextSetStatusFromStringQuiet(decContext *context,
const char *string) {
return context;} /* decContextSetStatusQuiet */
/* ------------------------------------------------------------------ */
-/* decContextStatusToString -- convert status flags to a string */
+/* decContextStatusToString -- convert status flags to a string */
/* */
/* context is a context with valid status field */
/* */
-/* returns a constant string describing the condition. If multiple */
+/* returns a constant string describing the condition. If multiple */
/* (or no) flags are set, a generic constant message is returned. */
/* ------------------------------------------------------------------ */
const char *decContextStatusToString(const decContext *context) {
#if DECSUBSET
if (status==DEC_Lost_digits ) return DEC_Condition_LD;
#endif
- if (status==0 ) return DEC_Condition_ZE;
+ if (status==0 ) return DEC_Condition_ZE;
return DEC_Condition_MU; /* Multiple errors */
} /* decContextStatusToString */
/* ------------------------------------------------------------------ */
+/* decContextTestEndian -- test whether DECLITEND is set correctly */
+/* */
+/* quiet is 1 to suppress message; 0 otherwise */
+/* returns 0 if DECLITEND is correct */
+/* 1 if DECLITEND is incorrect and should be 1 */
+/* -1 if DECLITEND is incorrect and should be 0 */
+/* */
+/* A message is displayed if the return value is not 0 and quiet==0. */
+/* */
+/* No error is possible. */
+/* ------------------------------------------------------------------ */
+Int decContextTestEndian(Flag quiet) {
+ Int res=0; /* optimist */
+ uInt dle=(uInt)DECLITEND; /* unsign */
+ if (dle>1) dle=1; /* ensure 0 or 1 */
+
+ if (LITEND!=DECLITEND) {
+ const char *adj;
+ if (!quiet) {
+ if (LITEND) adj="little";
+ else adj="big";
+#if DECCHECK
+ printf("Warning: DECLITEND is set to %d, but this computer appears to be %s-endian\n",
+ DECLITEND, adj);
+#endif
+ }
+ res=(Int)LITEND-dle;
+ }
+ return res;
+ } /* decContextTestEndian */
+
+/* ------------------------------------------------------------------ */
/* decContextTestSavedStatus -- test bits in saved status */
/* */
/* oldstatus is the status word to be tested */
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