diff options
Diffstat (limited to 'libdecnumber/decContext.h')
| -rw-r--r-- | libdecnumber/decContext.h | 82 |
1 files changed, 48 insertions, 34 deletions
diff --git a/libdecnumber/decContext.h b/libdecnumber/decContext.h index f80d03c..70effd8 100644 --- a/libdecnumber/decContext.h +++ b/libdecnumber/decContext.h @@ -34,7 +34,7 @@ /* */ /* Context variables must always have valid values: */ /* */ -/* status -- [any bits may be cleared, but not set, by user] */ +/* status -- [any bits may be cleared, but not set, by user] */ /* round -- must be one of the enumerated rounding modes */ /* */ /* The following variables are implied for fixed size formats (i.e., */ @@ -54,36 +54,42 @@ #define DECCONTEXT #define DECCNAME "decContext" /* Short name */ #define DECCFULLNAME "Decimal Context Descriptor" /* Verbose name */ - #define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */ + #define DECCAUTHOR "Mike Cowlishaw" /* Who to blame */ - #include "gstdint.h" /* C99 standard integers */ + #if !defined(int32_t) + #include <stdint.h> /* C99 standard integers */ + #endif #include <stdio.h> /* for printf, etc. */ - #include <signal.h> /* for traps */ + #include <signal.h> /* for traps */ /* Extended flags setting -- set this to 0 to use only IEEE flags */ + #if !defined(DECEXTFLAG) #define DECEXTFLAG 1 /* 1=enable extended flags */ + #endif /* Conditional code flag -- set this to 0 for best performance */ + #if !defined(DECSUBSET) #define DECSUBSET 0 /* 1=enable subset arithmetic */ + #endif /* Context for operations, with associated constants */ enum rounding { DEC_ROUND_CEILING, /* round towards +infinity */ - DEC_ROUND_UP, /* round away from 0 */ + DEC_ROUND_UP, /* round away from 0 */ DEC_ROUND_HALF_UP, /* 0.5 rounds up */ DEC_ROUND_HALF_EVEN, /* 0.5 rounds to nearest even */ DEC_ROUND_HALF_DOWN, /* 0.5 rounds down */ DEC_ROUND_DOWN, /* round towards 0 (truncate) */ DEC_ROUND_FLOOR, /* round towards -infinity */ - DEC_ROUND_05UP, /* round for reround */ + DEC_ROUND_05UP, /* round for reround */ DEC_ROUND_MAX /* enum must be less than this */ }; #define DEC_ROUND_DEFAULT DEC_ROUND_HALF_EVEN; typedef struct { - int32_t digits; /* working precision */ - int32_t emax; /* maximum positive exponent */ - int32_t emin; /* minimum negative exponent */ + int32_t digits; /* working precision */ + int32_t emax; /* maximum positive exponent */ + int32_t emin; /* minimum negative exponent */ enum rounding round; /* rounding mode */ uint32_t traps; /* trap-enabler flags */ uint32_t status; /* status flags */ @@ -102,9 +108,9 @@ #define DEC_MIN_EMIN -999999999 #define DEC_MAX_MATH 999999 /* max emax, etc., for math funcs. */ - /* Classifications for decimal numbers, aligned with 754r (note */ - /* that 'normal' and 'subnormal' are meaningful only with a */ - /* decContext or a fixed size format). */ + /* Classifications for decimal numbers, aligned with 754 (note that */ + /* 'normal' and 'subnormal' are meaningful only with a decContext */ + /* or a fixed size format). */ enum decClass { DEC_CLASS_SNAN, DEC_CLASS_QNAN, @@ -139,15 +145,15 @@ #define DEC_Division_impossible 0x00000004 #define DEC_Division_undefined 0x00000008 #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ - #define DEC_Inexact 0x00000020 - #define DEC_Invalid_context 0x00000040 + #define DEC_Inexact 0x00000020 + #define DEC_Invalid_context 0x00000040 #define DEC_Invalid_operation 0x00000080 #if DECSUBSET #define DEC_Lost_digits 0x00000100 #endif #define DEC_Overflow 0x00000200 - #define DEC_Clamped 0x00000400 - #define DEC_Rounded 0x00000800 + #define DEC_Clamped 0x00000400 + #define DEC_Rounded 0x00000800 #define DEC_Subnormal 0x00001000 #define DEC_Underflow 0x00002000 #else @@ -157,43 +163,43 @@ #define DEC_Division_impossible 0x00000010 #define DEC_Division_undefined 0x00000010 #define DEC_Insufficient_storage 0x00000010 /* [when malloc fails] */ - #define DEC_Inexact 0x00000001 - #define DEC_Invalid_context 0x00000010 + #define DEC_Inexact 0x00000001 + #define DEC_Invalid_context 0x00000010 #define DEC_Invalid_operation 0x00000010 #if DECSUBSET #define DEC_Lost_digits 0x00000000 #endif #define DEC_Overflow 0x00000008 - #define DEC_Clamped 0x00000000 - #define DEC_Rounded 0x00000000 + #define DEC_Clamped 0x00000000 + #define DEC_Rounded 0x00000000 #define DEC_Subnormal 0x00000000 #define DEC_Underflow 0x00000004 #endif - /* IEEE 854 groupings for the flags */ + /* IEEE 754 groupings for the flags */ /* [DEC_Clamped, DEC_Lost_digits, DEC_Rounded, and DEC_Subnormal */ - /* are not in IEEE 854] */ - #define DEC_IEEE_854_Division_by_zero (DEC_Division_by_zero) + /* are not in IEEE 754] */ + #define DEC_IEEE_754_Division_by_zero (DEC_Division_by_zero) #if DECSUBSET - #define DEC_IEEE_854_Inexact (DEC_Inexact | DEC_Lost_digits) + #define DEC_IEEE_754_Inexact (DEC_Inexact | DEC_Lost_digits) #else - #define DEC_IEEE_854_Inexact (DEC_Inexact) + #define DEC_IEEE_754_Inexact (DEC_Inexact) #endif - #define DEC_IEEE_854_Invalid_operation (DEC_Conversion_syntax | \ + #define DEC_IEEE_754_Invalid_operation (DEC_Conversion_syntax | \ DEC_Division_impossible | \ DEC_Division_undefined | \ DEC_Insufficient_storage | \ - DEC_Invalid_context | \ + DEC_Invalid_context | \ DEC_Invalid_operation) - #define DEC_IEEE_854_Overflow (DEC_Overflow) - #define DEC_IEEE_854_Underflow (DEC_Underflow) + #define DEC_IEEE_754_Overflow (DEC_Overflow) + #define DEC_IEEE_754_Underflow (DEC_Underflow) /* flags which are normally errors (result is qNaN, infinite, or 0) */ - #define DEC_Errors (DEC_IEEE_854_Division_by_zero | \ - DEC_IEEE_854_Invalid_operation | \ - DEC_IEEE_854_Overflow | DEC_IEEE_854_Underflow) + #define DEC_Errors (DEC_IEEE_754_Division_by_zero | \ + DEC_IEEE_754_Invalid_operation | \ + DEC_IEEE_754_Overflow | DEC_IEEE_754_Underflow) /* flags which cause a result to become qNaN */ - #define DEC_NaNs DEC_IEEE_854_Invalid_operation + #define DEC_NaNs DEC_IEEE_754_Invalid_operation /* flags which are normally for information only (finite results) */ #if DECSUBSET @@ -203,6 +209,13 @@ #define DEC_Information (DEC_Clamped | DEC_Rounded | DEC_Inexact) #endif + /* IEEE 854 names (for compatibility with older decNumber versions) */ + #define DEC_IEEE_854_Division_by_zero DEC_IEEE_754_Division_by_zero + #define DEC_IEEE_854_Inexact DEC_IEEE_754_Inexact + #define DEC_IEEE_854_Invalid_operation DEC_IEEE_754_Invalid_operation + #define DEC_IEEE_854_Overflow DEC_IEEE_754_Overflow + #define DEC_IEEE_854_Underflow DEC_IEEE_754_Underflow + /* Name strings for the exceptional conditions */ #define DEC_Condition_CS "Conversion syntax" #define DEC_Condition_DZ "Division by zero" @@ -226,7 +239,7 @@ /* including terminator */ /* Initialization descriptors, used by decContextDefault */ - #define DEC_INIT_BASE 0 + #define DEC_INIT_BASE 0 #define DEC_INIT_DECIMAL32 32 #define DEC_INIT_DECIMAL64 64 #define DEC_INIT_DECIMAL128 128 @@ -251,6 +264,7 @@ extern decContext * decContextSetStatusFromStringQuiet(decContext *, const char *); extern decContext * decContextSetStatusQuiet(decContext *, uint32_t); extern const char * decContextStatusToString(const decContext *); + extern int32_t decContextTestEndian(uint8_t); extern uint32_t decContextTestSavedStatus(uint32_t, uint32_t); extern uint32_t decContextTestStatus(decContext *, uint32_t); extern decContext * decContextZeroStatus(decContext *); |