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-rw-r--r--stdio-common/printf_fphex.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/stdio-common/printf_fphex.c b/stdio-common/printf_fphex.c
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+++ b/stdio-common/printf_fphex.c
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+/* Print floating point number in hexadecimal notation according to
+ ISO C 9X.
+ Copyright (C) 1997 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <ctype.h>
+#include <ieee754.h>
+#include <math.h>
+#include <printf.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "_itoa.h"
+#include "../locale/localeinfo.h"
+
+/* #define NDEBUG 1*/ /* Undefine this for debugging assertions. */
+#include <assert.h>
+
+/* This defines make it possible to use the same code for GNU C library and
+ the GNU I/O library. */
+#ifdef USE_IN_LIBIO
+# include <libioP.h>
+# define PUT(f, s, n) _IO_sputn (f, s, n)
+# define PAD(f, c, n) _IO_padn (f, c, n)
+/* We use this file GNU C library and GNU I/O library. So make
+ names equal. */
+# undef putc
+# define putc(c, f) _IO_putc_unlocked (c, f)
+# define size_t _IO_size_t
+# define FILE _IO_FILE
+#else /* ! USE_IN_LIBIO */
+# define PUT(f, s, n) fwrite (s, 1, n, f)
+# define PAD(f, c, n) __printf_pad (f, c, n)
+ssize_t __printf_pad __P ((FILE *, char pad, int n)); /* In vfprintf.c. */
+#endif /* USE_IN_LIBIO */
+
+/* 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, len) \
+ do \
+ { \
+ int outlen = (len); \
+ const char *cp = (ptr); \
+ while (outlen-- > 0) \
+ outchar (*cp++); \
+ } while (0)
+
+#define PADN(ch, len) \
+ do \
+ { \
+ if (PAD (fp, ch, len) != len) \
+ return -1; \
+ done += len; \
+ } \
+ while (0)
+
+
+int
+__printf_fphex (FILE *fp,
+ const struct printf_info *info,
+ const void *const *args)
+{
+ /* The floating-point value to output. */
+ union
+ {
+ union ieee754_double dbl;
+ union ieee854_long_double ldbl;
+ }
+ fpnum;
+
+ /* Locale-dependent representation of decimal point. */
+ wchar_t decimal;
+
+ /* "NaN" or "Inf" for the special cases. */
+ const char *special = NULL;
+
+ /* Buffer for the generated number string for the mantissa. The
+ maximal size for the mantissa is 64 bits. */
+ char numbuf[16];
+ char *numstr;
+ char *numend;
+ int negative;
+
+ /* The maximal exponent of two in decimal notation has 5 digits. */
+ char expbuf[5];
+ char *expstr;
+ 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;
+
+
+ /* Figure out the decimal point character. */
+ if (info->extra == 0)
+ {
+ if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
+ strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)
+ decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
+ }
+ else
+ {
+ if (mbtowc (&decimal, _NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT),
+ strlen (_NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT))) <= 0)
+ decimal = (wchar_t) *_NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT);
+ }
+ /* Give default value. */
+ if (decimal == L'\0')
+ decimal = L'.';
+
+
+ /* Fetch the argument value. */
+ if (info->is_long_double && sizeof (long double) > sizeof (double))
+ {
+ fpnum.ldbl.d = *(const long double *) args[0];
+
+ /* Check for special values: not a number or infinity. */
+ if (__isnanl (fpnum.ldbl.d))
+ {
+ special = isupper (info->spec) ? "NAN" : "nan";
+ negative = 0;
+ }
+ else
+ {
+ if (__isinfl (fpnum.ldbl.d))
+ special = isupper (info->spec) ? "INF" : "inf";
+
+ negative = fpnum.ldbl.d < 0;
+ }
+ }
+ else
+ {
+ fpnum.dbl.d = *(const double *) args[0];
+
+ /* Check for special values: not a number or infinity. */
+ if (__isnan (fpnum.dbl.d))
+ {
+ special = isupper (info->spec) ? "NAN" : "nan";
+ negative = 0;
+ }
+ else
+ {
+ if (__isinf (fpnum.dbl.d))
+ special = isupper (info->spec) ? "INF" : "inf";
+
+ negative = fpnum.dbl.d < 0;
+ }
+ }
+
+ if (special)
+ {
+ int width = info->prec > info->width ? info->prec : 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, 3);
+
+ if (info->left && width > 0)
+ PADN (' ', width);
+
+ return done;
+ }
+
+ /* We are handling here only 64 and 80 bit IEEE foating point
+ numbers. */
+ if (info->is_long_double == 0 || sizeof (double) == sizeof (long double))
+ {
+ /* We have 52 bits of mantissa plus one implicit digit. Since
+ 52 bits are representable without rest using hexadecimal
+ digits we use only the implicit digits for the number before
+ the decimal point. */
+ if (sizeof (unsigned long int) > 6)
+ {
+ unsigned long int num;
+
+ num = (((unsigned long int) fpnum.dbl.ieee.mantissa0) << 32
+ | fpnum.dbl.ieee.mantissa1);
+
+ zero_mantissa = num == 0;
+
+ numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,
+ info->spec == 'A');
+ }
+ else
+ {
+ unsigned long long int num;
+
+ num = (((unsigned long long int) fpnum.dbl.ieee.mantissa0) << 32
+ | fpnum.dbl.ieee.mantissa1);
+
+ zero_mantissa = num == 0;
+
+ numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');
+ }
+
+ /* Fill with zeroes. */
+ while (numstr > numbuf + (sizeof numbuf - 13)) /* 52 ÷ 4 = 13 */
+ *--numstr = '0';
+
+ leading = fpnum.dbl.ieee.exponent == 0 ? '0' : '1';
+
+ exponent = fpnum.dbl.ieee.exponent;
+
+ if (exponent != 0 && exponent < IEEE754_DOUBLE_BIAS)
+ {
+ expnegative = 1;
+ exponent = abs (exponent - IEEE754_DOUBLE_BIAS);
+ }
+ else
+ {
+ expnegative = 0;
+ if (exponent != 0)
+ exponent -= IEEE754_DOUBLE_BIAS;
+ }
+ }
+ else
+ {
+ /* The "strange" 80 bit format on ix86 and m68k has an explicit
+ leading digit in the 64 bit mantissa. */
+ assert (sizeof (long double) == 12);
+
+ if (sizeof (unsigned long int) > 6)
+ {
+ unsigned long int num;
+
+ num = (((unsigned long int) fpnum.dbl.ieee.mantissa0) << 32
+ | fpnum.dbl.ieee.mantissa1);
+
+ zero_mantissa = num == 0;
+
+ numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,
+ info->spec == 'A');
+ }
+ else
+ {
+ unsigned long long int num;
+
+ num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32
+ | fpnum.ldbl.ieee.mantissa1);
+
+ zero_mantissa = num == 0;
+
+ numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');
+ }
+
+ /* We use a full nibble for the leading digit. */
+ leading = *numstr++;
+
+ /* Fill with zeroes. */
+ while (numstr > numbuf + (sizeof numbuf - 15)) /* 60 ÷ 4 = 15 */
+ *--numstr = '0';
+
+ /* We have 3 bits from the mantissa in the leading nibble. */
+ exponent = fpnum.ldbl.ieee.exponent - 3;
+
+ if (exponent != 0 && exponent < IEEE854_LONG_DOUBLE_BIAS)
+ {
+ expnegative = 1;
+ exponent = abs (exponent - IEEE854_LONG_DOUBLE_BIAS);
+ }
+ else
+ {
+ expnegative = 0;
+ if (exponent != 0)
+ exponent -= IEEE854_LONG_DOUBLE_BIAS;
+ }
+ }
+
+ /* Look for trailing zeroes. */
+ if (! zero_mantissa)
+ {
+ numend = numbuf + sizeof numbuf;
+ while (numend[-1] == '0')
+ --numend;
+
+ if (precision == -1)
+ precision = numend - numstr;
+ else if (precision < numend - numstr
+ && (numstr[precision] > 5
+ || (numstr[precision] == 5
+ && (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')
+ {
+ numstr[cnt] = info->spec; /* This is tricky,
+ think about it! */
+ break;
+ }
+ else if (tolower (ch) < 'f')
+ {
+ ++numstr[cnt];
+ break;
+ }
+ else
+ numstr[cnt] = '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)
+ expnegative = 0;
+ }
+ else
+ exponent += 4;
+ }
+ }
+ }
+ }
+ else
+ numend = numstr;
+
+ /* Now we can compute the exponent string. */
+ expstr = _itoa_word (exponent, expbuf + sizeof expbuf, 10, 0);
+
+ /* Now we have all information to compute the size. */
+ width -= ((negative || info->showsign || info->space)
+ /* Sign. */
+ + 2 + 1 + 1 + precision + 1 + 1
+ /* 0x h . hhh P ExpoSign. */
+ + ((expbuf + sizeof expbuf) - expstr));
+ /* Exponent. */
+
+ /* A special case if when the mantissa is zero and the `#' is not
+ given. In this case we must not print the decimal point. */
+ if (zero_mantissa && precision == 0 && !info->alt)
+ ++width; /* This nihilates the +1 for the decimal-point
+ character in the following equation. */
+
+ if (!info->left && width > 0)
+ PADN (' ', width);
+
+ if (negative)
+ outchar ('-');
+ else if (info->showsign)
+ outchar ('+');
+ else if (info->space)
+ outchar (' ');
+
+ outchar ('0');
+ outchar (info->spec == 'A' ? 'X' : 'x');
+ outchar (leading);
+
+ if (!zero_mantissa || precision != 0 || info->alt)
+ outchar (decimal);
+
+ if (!zero_mantissa || precision != 0)
+ {
+ PRINT (numstr, MIN (numend - numstr, precision));
+ if (precision > numend - numstr)
+ PADN ('0', precision - (numend - numstr));
+ }
+
+ if (info->left && info->pad == '0' && width > 0)
+ PADN ('0', width);
+
+ outchar (info->spec == 'A' ? 'P' : 'p');
+
+ outchar (expnegative ? '-' : '+');
+
+ PRINT (expstr, (expbuf + sizeof expbuf) - expstr);
+
+ if (info->left && info->pad != '0' && width > 0)
+ PADN (info->pad, width);
+
+ return done;
+}
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