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-rw-r--r--libquadmath/printf/printf_fphex.c463
1 files changed, 463 insertions, 0 deletions
diff --git a/libquadmath/printf/printf_fphex.c b/libquadmath/printf/printf_fphex.c
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+++ b/libquadmath/printf/printf_fphex.c
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+/* Print floating point number in hexadecimal notation according to ISO C99.
+ Copyright (C) 1997-2002,2004,2006 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <config.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#define NDEBUG
+#include <assert.h>
+#include "quadmath-printf.h"
+#include "_itoa.h"
+#include "_itowa.h"
+
+
+/* Macros for doing the actual output. */
+
+#define outchar(ch) \
+ do \
+ { \
+ register const int outc = (ch); \
+ if (PUTC (outc, fp) == EOF) \
+ return -1; \
+ ++done; \
+ } while (0)
+
+#define PRINT(ptr, wptr, len) \
+ do \
+ { \
+ register size_t outlen = (len); \
+ if (wide) \
+ while (outlen-- > 0) \
+ outchar (*wptr++); \
+ else \
+ while (outlen-- > 0) \
+ outchar (*ptr++); \
+ } while (0)
+
+#define PADN(ch, len) \
+ do \
+ { \
+ if (PAD (fp, ch, len) != len) \
+ return -1; \
+ done += len; \
+ } \
+ while (0)
+
+
+
+int
+__quadmath_printf_fphex (struct __quadmath_printf_file *fp,
+ const struct printf_info *info,
+ const void *const *args)
+{
+ /* The floating-point value to output. */
+ ieee854_float128 fpnum;
+
+ /* Locale-dependent representation of decimal point. */
+ const char *decimal;
+ wchar_t decimalwc;
+
+ /* "NaN" or "Inf" for the special cases. */
+ const char *special = NULL;
+ const wchar_t *wspecial = NULL;
+
+ /* Buffer for the generated number string for the mantissa. The
+ maximal size for the mantissa is 128 bits. */
+ char numbuf[32];
+ char *numstr;
+ char *numend;
+ wchar_t wnumbuf[32];
+ wchar_t *wnumstr;
+ wchar_t *wnumend;
+ int negative;
+
+ /* The maximal exponent of two in decimal notation has 5 digits. */
+ char expbuf[5];
+ char *expstr;
+ wchar_t wexpbuf[5];
+ wchar_t *wexpstr;
+ int expnegative;
+ int exponent;
+
+ /* Non-zero is mantissa is zero. */
+ int zero_mantissa;
+
+ /* The leading digit before the decimal point. */
+ char leading;
+
+ /* Precision. */
+ int precision = info->prec;
+
+ /* Width. */
+ int width = info->width;
+
+ /* Number of characters written. */
+ int done = 0;
+
+ /* Nonzero if this is output on a wide character stream. */
+ int wide = info->wide;
+
+ /* Figure out the decimal point character. */
+#ifdef USE_NL_LANGINFO
+ if (info->extra == 0)
+ decimal = nl_langinfo (DECIMAL_POINT);
+ else
+ {
+ decimal = nl_langinfo (MON_DECIMAL_POINT);
+ if (*decimal == '\0')
+ decimal = nl_langinfo (DECIMAL_POINT);
+ }
+ /* The decimal point character must never be zero. */
+ assert (*decimal != '\0');
+#elif defined USE_LOCALECONV
+ const struct lconv *lc = localeconv ();
+ if (info->extra == 0)
+ decimal = lc->decimal_point;
+ else
+ {
+ decimal = lc->mon_decimal_point;
+ if (decimal == NULL || *decimal == '\0')
+ decimal = lc->decimal_point;
+ }
+ if (decimal == NULL || *decimal == '\0')
+ decimal = ".";
+#else
+ decimal = ".";
+#endif
+#ifdef USE_NL_LANGINFO_WC
+ if (info->extra == 0)
+ decimalwc = nl_langinfo_wc (_NL_NUMERIC_DECIMAL_POINT_WC);
+ else
+ {
+ decimalwc = nl_langinfo_wc (_NL_MONETARY_DECIMAL_POINT_WC);
+ if (decimalwc == L_('\0'))
+ decimalwc = nl_langinfo_wc (_NL_NUMERIC_DECIMAL_POINT_WC);
+ }
+ /* The decimal point character must never be zero. */
+ assert (decimalwc != L_('\0'));
+#else
+ decimalwc = L_('.');
+#endif
+
+ /* Fetch the argument value. */
+ {
+ fpnum.value = **(const __float128 **) args[0];
+
+ /* Check for special values: not a number or infinity. */
+ if (isnanq (fpnum.value))
+ {
+ negative = fpnum.ieee.negative != 0;
+ if (isupper (info->spec))
+ {
+ special = "NAN";
+ wspecial = L_("NAN");
+ }
+ else
+ {
+ special = "nan";
+ wspecial = L_("nan");
+ }
+ }
+ else
+ {
+ if (isinfq (fpnum.value))
+ {
+ if (isupper (info->spec))
+ {
+ special = "INF";
+ wspecial = L_("INF");
+ }
+ else
+ {
+ special = "inf";
+ wspecial = L_("inf");
+ }
+ }
+
+ negative = signbitq (fpnum.value);
+ }
+ }
+
+ if (special)
+ {
+ int width = info->width;
+
+ if (negative || info->showsign || info->space)
+ --width;
+ width -= 3;
+
+ if (!info->left && width > 0)
+ PADN (' ', width);
+
+ if (negative)
+ outchar ('-');
+ else if (info->showsign)
+ outchar ('+');
+ else if (info->space)
+ outchar (' ');
+
+ PRINT (special, wspecial, 3);
+
+ if (info->left && width > 0)
+ PADN (' ', width);
+
+ return done;
+ }
+
+ {
+ /* We have 112 bits of mantissa plus one implicit digit. Since
+ 112 bits are representable without rest using hexadecimal
+ digits we use only the implicit digits for the number before
+ the decimal point. */
+ uint64_t num0, num1;
+
+ assert (sizeof (long double) == 16);
+
+ num0 = fpnum.ieee.mant_high;
+ num1 = fpnum.ieee.mant_low;
+
+ zero_mantissa = (num0|num1) == 0;
+
+ if (sizeof (unsigned long int) > 6)
+ {
+ numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16,
+ info->spec == 'A');
+ wnumstr = _itowa_word (num1,
+ wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),
+ 16, info->spec == 'A');
+ }
+ else
+ {
+ numstr = _itoa (num1, numbuf + sizeof numbuf, 16,
+ info->spec == 'A');
+ wnumstr = _itowa (num1,
+ wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),
+ 16, info->spec == 'A');
+ }
+
+ while (numstr > numbuf + (sizeof numbuf - 64 / 4))
+ {
+ *--numstr = '0';
+ *--wnumstr = L_('0');
+ }
+
+ if (sizeof (unsigned long int) > 6)
+ {
+ numstr = _itoa_word (num0, numstr, 16, info->spec == 'A');
+ wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A');
+ }
+ else
+ {
+ numstr = _itoa (num0, numstr, 16, info->spec == 'A');
+ wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A');
+ }
+
+ /* Fill with zeroes. */
+ while (numstr > numbuf + (sizeof numbuf - 112 / 4))
+ {
+ *--numstr = '0';
+ *--wnumstr = L_('0');
+ }
+
+ leading = fpnum.ieee.exponent == 0 ? '0' : '1';
+
+ exponent = fpnum.ieee.exponent;
+
+ if (exponent == 0)
+ {
+ if (zero_mantissa)
+ expnegative = 0;
+ else
+ {
+ /* This is a denormalized number. */
+ expnegative = 1;
+ exponent = IEEE854_FLOAT128_BIAS - 1;
+ }
+ }
+ else if (exponent >= IEEE854_FLOAT128_BIAS)
+ {
+ expnegative = 0;
+ exponent -= IEEE854_FLOAT128_BIAS;
+ }
+ else
+ {
+ expnegative = 1;
+ exponent = -(exponent - IEEE854_FLOAT128_BIAS);
+ }
+ }
+
+ /* Look for trailing zeroes. */
+ if (! zero_mantissa)
+ {
+ wnumend = &wnumbuf[sizeof wnumbuf / sizeof wnumbuf[0]];
+ numend = &numbuf[sizeof numbuf / sizeof numbuf[0]];
+ while (wnumend[-1] == L_('0'))
+ {
+ --wnumend;
+ --numend;
+ }
+
+ if (precision == -1)
+ precision = numend - numstr;
+ else if (precision < numend - numstr
+ && (numstr[precision] > '8'
+ || (('A' < '0' || 'a' < '0')
+ && numstr[precision] < '0')
+ || (numstr[precision] == '8'
+ && (precision + 1 < numend - numstr
+ /* Round to even. */
+ || (precision > 0
+ && ((numstr[precision - 1] & 1)
+ ^ (isdigit (numstr[precision - 1]) == 0)))
+ || (precision == 0
+ && ((leading & 1)
+ ^ (isdigit (leading) == 0)))))))
+ {
+ /* Round up. */
+ int cnt = precision;
+ while (--cnt >= 0)
+ {
+ char ch = numstr[cnt];
+ /* We assume that the digits and the letters are ordered
+ like in ASCII. This is true for the rest of GNU, too. */
+ if (ch == '9')
+ {
+ wnumstr[cnt] = (wchar_t) info->spec;
+ numstr[cnt] = info->spec; /* This is tricky,
+ think about it! */
+ break;
+ }
+ else if (tolower (ch) < 'f')
+ {
+ ++numstr[cnt];
+ ++wnumstr[cnt];
+ break;
+ }
+ else
+ {
+ numstr[cnt] = '0';
+ wnumstr[cnt] = L_('0');
+ }
+ }
+ if (cnt < 0)
+ {
+ /* The mantissa so far was fff...f Now increment the
+ leading digit. Here it is again possible that we
+ get an overflow. */
+ if (leading == '9')
+ leading = info->spec;
+ else if (tolower (leading) < 'f')
+ ++leading;
+ else
+ {
+ leading = '1';
+ if (expnegative)
+ {
+ exponent -= 4;
+ if (exponent <= 0)
+ {
+ exponent = -exponent;
+ expnegative = 0;
+ }
+ }
+ else
+ exponent += 4;
+ }
+ }
+ }
+ }
+ else
+ {
+ if (precision == -1)
+ precision = 0;
+ numend = numstr;
+ wnumend = wnumstr;
+ }
+
+ /* Now we can compute the exponent string. */
+ expstr = _itoa_word (exponent, expbuf + sizeof expbuf, 10, 0);
+ wexpstr = _itowa_word (exponent,
+ wexpbuf + sizeof wexpbuf / sizeof (wchar_t), 10, 0);
+
+ /* Now we have all information to compute the size. */
+ width -= ((negative || info->showsign || info->space)
+ /* Sign. */
+ + 2 + 1 + 0 + precision + 1 + 1
+ /* 0x h . hhh P ExpoSign. */
+ + ((expbuf + sizeof expbuf) - expstr));
+ /* Exponent. */
+
+ /* Count the decimal point.
+ A special case when the mantissa or the precision is zero and the `#'
+ is not given. In this case we must not print the decimal point. */
+ if (precision > 0 || info->alt)
+ width -= wide ? 1 : strlen (decimal);
+
+ if (!info->left && info->pad != '0' && width > 0)
+ PADN (' ', width);
+
+ if (negative)
+ outchar ('-');
+ else if (info->showsign)
+ outchar ('+');
+ else if (info->space)
+ outchar (' ');
+
+ outchar ('0');
+ if ('X' - 'A' == 'x' - 'a')
+ outchar (info->spec + ('x' - 'a'));
+ else
+ outchar (info->spec == 'A' ? 'X' : 'x');
+
+ if (!info->left && info->pad == '0' && width > 0)
+ PADN ('0', width);
+
+ outchar (leading);
+
+ if (precision > 0 || info->alt)
+ {
+ const wchar_t *wtmp = &decimalwc;
+ PRINT (decimal, wtmp, wide ? 1 : strlen (decimal));
+ }
+
+ if (precision > 0)
+ {
+ ssize_t tofill = precision - (numend - numstr);
+ PRINT (numstr, wnumstr, MIN (numend - numstr, precision));
+ if (tofill > 0)
+ PADN ('0', tofill);
+ }
+
+ if ('P' - 'A' == 'p' - 'a')
+ outchar (info->spec + ('p' - 'a'));
+ else
+ outchar (info->spec == 'A' ? 'P' : 'p');
+
+ outchar (expnegative ? '-' : '+');
+
+ PRINT (expstr, wexpstr, (expbuf + sizeof expbuf) - expstr);
+
+ if (info->left && info->pad != '0' && width > 0)
+ PADN (info->pad, width);
+
+ return done;
+}
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