1 /* Print floating point number in hexadecimal notation according to ISO C99.
2 Copyright (C) 1997-2012 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
28 #include "quadmath-rounding-mode.h"
29 #include "quadmath-printf.h"
34 /* Macros for doing the actual output. */
39 register const int outc = (ch); \
40 if (PUTC (outc, fp) == EOF) \
45 #define PRINT(ptr, wptr, len) \
48 register size_t outlen = (len); \
50 while (outlen-- > 0) \
53 while (outlen-- > 0) \
57 #define PADN(ch, len) \
60 if (PAD (fp, ch, len) != len) \
69 __quadmath_printf_fphex (struct __quadmath_printf_file
*fp
,
70 const struct printf_info
*info
,
71 const void *const *args
)
73 /* The floating-point value to output. */
74 ieee854_float128 fpnum
;
76 /* Locale-dependent representation of decimal point. */
80 /* "NaN" or "Inf" for the special cases. */
81 const char *special
= NULL
;
82 const wchar_t *wspecial
= NULL
;
84 /* Buffer for the generated number string for the mantissa. The
85 maximal size for the mantissa is 128 bits. */
94 /* The maximal exponent of two in decimal notation has 5 digits. */
102 /* Non-zero is mantissa is zero. */
105 /* The leading digit before the decimal point. */
109 int precision
= info
->prec
;
112 int width
= info
->width
;
114 /* Number of characters written. */
117 /* Nonzero if this is output on a wide character stream. */
118 int wide
= info
->wide
;
122 /* Figure out the decimal point character. */
123 #ifdef USE_NL_LANGINFO
124 if (info
->extra
== 0)
125 decimal
= nl_langinfo (DECIMAL_POINT
);
128 decimal
= nl_langinfo (MON_DECIMAL_POINT
);
129 if (*decimal
== '\0')
130 decimal
= nl_langinfo (DECIMAL_POINT
);
132 /* The decimal point character must never be zero. */
133 assert (*decimal
!= '\0');
134 #elif defined USE_LOCALECONV
135 const struct lconv
*lc
= localeconv ();
136 if (info
->extra
== 0)
137 decimal
= lc
->decimal_point
;
140 decimal
= lc
->mon_decimal_point
;
141 if (decimal
== NULL
|| *decimal
== '\0')
142 decimal
= lc
->decimal_point
;
144 if (decimal
== NULL
|| *decimal
== '\0')
149 #ifdef USE_NL_LANGINFO_WC
150 if (info
->extra
== 0)
151 decimalwc
= nl_langinfo_wc (_NL_NUMERIC_DECIMAL_POINT_WC
);
154 decimalwc
= nl_langinfo_wc (_NL_MONETARY_DECIMAL_POINT_WC
);
155 if (decimalwc
== L_('\0'))
156 decimalwc
= nl_langinfo_wc (_NL_NUMERIC_DECIMAL_POINT_WC
);
158 /* The decimal point character must never be zero. */
159 assert (decimalwc
!= L_('\0'));
164 /* Fetch the argument value. */
166 fpnum
.value
= **(const __float128
**) args
[0];
168 /* Check for special values: not a number or infinity. */
169 if (isnanq (fpnum
.value
))
171 negative
= fpnum
.ieee
.negative
!= 0;
172 if (isupper (info
->spec
))
175 wspecial
= L_("NAN");
180 wspecial
= L_("nan");
185 if (isinfq (fpnum
.value
))
187 if (isupper (info
->spec
))
190 wspecial
= L_("INF");
195 wspecial
= L_("inf");
199 negative
= signbitq (fpnum
.value
);
205 int width
= info
->width
;
207 if (negative
|| info
->showsign
|| info
->space
)
211 if (!info
->left
&& width
> 0)
216 else if (info
->showsign
)
218 else if (info
->space
)
221 PRINT (special
, wspecial
, 3);
223 if (info
->left
&& width
> 0)
230 /* We have 112 bits of mantissa plus one implicit digit. Since
231 112 bits are representable without rest using hexadecimal
232 digits we use only the implicit digits for the number before
233 the decimal point. */
236 assert (sizeof (long double) == 16);
238 num0
= (((unsigned long long int) fpnum
.ieee
.mantissa0
) << 32
239 | fpnum
.ieee
.mantissa1
);
240 num1
= (((unsigned long long int) fpnum
.ieee
.mantissa2
) << 32
241 | fpnum
.ieee
.mantissa3
);
243 zero_mantissa
= (num0
|num1
) == 0;
245 if (sizeof (unsigned long int) > 6)
247 numstr
= _itoa_word (num1
, numbuf
+ sizeof numbuf
, 16,
249 wnumstr
= _itowa_word (num1
,
250 wnumbuf
+ sizeof (wnumbuf
) / sizeof (wchar_t),
251 16, info
->spec
== 'A');
255 numstr
= _itoa (num1
, numbuf
+ sizeof numbuf
, 16,
257 wnumstr
= _itowa (num1
,
258 wnumbuf
+ sizeof (wnumbuf
) / sizeof (wchar_t),
259 16, info
->spec
== 'A');
262 while (numstr
> numbuf
+ (sizeof numbuf
- 64 / 4))
265 *--wnumstr
= L_('0');
268 if (sizeof (unsigned long int) > 6)
270 numstr
= _itoa_word (num0
, numstr
, 16, info
->spec
== 'A');
271 wnumstr
= _itowa_word (num0
, wnumstr
, 16, info
->spec
== 'A');
275 numstr
= _itoa (num0
, numstr
, 16, info
->spec
== 'A');
276 wnumstr
= _itowa (num0
, wnumstr
, 16, info
->spec
== 'A');
279 /* Fill with zeroes. */
280 while (numstr
> numbuf
+ (sizeof numbuf
- 112 / 4))
282 *--wnumstr
= L_('0');
286 leading
= fpnum
.ieee
.exponent
== 0 ? '0' : '1';
288 exponent
= fpnum
.ieee
.exponent
;
296 /* This is a denormalized number. */
298 exponent
= IEEE854_FLOAT128_BIAS
- 1;
301 else if (exponent
>= IEEE854_FLOAT128_BIAS
)
304 exponent
-= IEEE854_FLOAT128_BIAS
;
309 exponent
= -(exponent
- IEEE854_FLOAT128_BIAS
);
313 /* Look for trailing zeroes. */
316 wnumend
= &wnumbuf
[sizeof wnumbuf
/ sizeof wnumbuf
[0]];
317 numend
= &numbuf
[sizeof numbuf
/ sizeof numbuf
[0]];
318 while (wnumend
[-1] == L_('0'))
324 do_round_away
= false;
326 if (precision
!= -1 && precision
< numend
- numstr
)
328 char last_digit
= precision
> 0 ? numstr
[precision
- 1] : leading
;
329 char next_digit
= numstr
[precision
];
330 int last_digit_value
= (last_digit
>= 'A' && last_digit
<= 'F'
331 ? last_digit
- 'A' + 10
332 : (last_digit
>= 'a' && last_digit
<= 'f'
333 ? last_digit
- 'a' + 10
334 : last_digit
- '0'));
335 int next_digit_value
= (next_digit
>= 'A' && next_digit
<= 'F'
336 ? next_digit
- 'A' + 10
337 : (next_digit
>= 'a' && next_digit
<= 'f'
338 ? next_digit
- 'a' + 10
339 : next_digit
- '0'));
340 bool more_bits
= ((next_digit_value
& 7) != 0
341 || precision
+ 1 < numend
- numstr
);
343 int rounding_mode
= get_rounding_mode ();
344 do_round_away
= round_away (negative
, last_digit_value
& 1,
345 next_digit_value
>= 8, more_bits
,
351 precision
= numend
- numstr
;
352 else if (do_round_away
)
358 char ch
= numstr
[cnt
];
359 /* We assume that the digits and the letters are ordered
360 like in ASCII. This is true for the rest of GNU, too. */
363 wnumstr
[cnt
] = (wchar_t) info
->spec
;
364 numstr
[cnt
] = info
->spec
; /* This is tricky,
368 else if (tolower (ch
) < 'f')
377 wnumstr
[cnt
] = L_('0');
382 /* The mantissa so far was fff...f Now increment the
383 leading digit. Here it is again possible that we
386 leading
= info
->spec
;
387 else if (tolower (leading
) < 'f')
397 exponent
= -exponent
;
415 /* Now we can compute the exponent string. */
416 expstr
= _itoa_word (exponent
, expbuf
+ sizeof expbuf
, 10, 0);
417 wexpstr
= _itowa_word (exponent
,
418 wexpbuf
+ sizeof wexpbuf
/ sizeof (wchar_t), 10, 0);
420 /* Now we have all information to compute the size. */
421 width
-= ((negative
|| info
->showsign
|| info
->space
)
423 + 2 + 1 + 0 + precision
+ 1 + 1
424 /* 0x h . hhh P ExpoSign. */
425 + ((expbuf
+ sizeof expbuf
) - expstr
));
428 /* Count the decimal point.
429 A special case when the mantissa or the precision is zero and the `#'
430 is not given. In this case we must not print the decimal point. */
431 if (precision
> 0 || info
->alt
)
432 width
-= wide
? 1 : strlen (decimal
);
434 if (!info
->left
&& info
->pad
!= '0' && width
> 0)
439 else if (info
->showsign
)
441 else if (info
->space
)
445 if ('X' - 'A' == 'x' - 'a')
446 outchar (info
->spec
+ ('x' - 'a'));
448 outchar (info
->spec
== 'A' ? 'X' : 'x');
450 if (!info
->left
&& info
->pad
== '0' && width
> 0)
455 if (precision
> 0 || info
->alt
)
457 const wchar_t *wtmp
= &decimalwc
;
458 PRINT (decimal
, wtmp
, wide
? 1 : strlen (decimal
));
463 ssize_t tofill
= precision
- (numend
- numstr
);
464 PRINT (numstr
, wnumstr
, MIN (numend
- numstr
, precision
));
469 if ('P' - 'A' == 'p' - 'a')
470 outchar (info
->spec
+ ('p' - 'a'));
472 outchar (info
->spec
== 'A' ? 'P' : 'p');
474 outchar (expnegative
? '-' : '+');
476 PRINT (expstr
, wexpstr
, (expbuf
+ sizeof expbuf
) - expstr
);
478 if (info
->left
&& info
->pad
!= '0' && width
> 0)
479 PADN (info
->pad
, width
);