[thirdparty/glibc.git] / stdio-common / printf_fphex.c

/* 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 */
\f
/* 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)
\f

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.  */
      unsigned long long int num;

      num = (((unsigned long long int) fpnum.dbl.ieee.mantissa0) << 32
	     | fpnum.dbl.ieee.mantissa1);

      zero_mantissa = num == 0;

      if (sizeof (unsigned long int) > 6)
	numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,
			     info->spec == 'A');
      else
	numstr = _itoa (num, numbuf + sizeof numbuf, 16,
			info->spec == 'A');

      /* Fill with zeroes.  */
Commit	Line	Data
2f6d1f1b UD	1	/* Print floating point number in hexadecimal notation according to
	2	ISO C 9X.
	3	Copyright (C) 1997 Free Software Foundation, Inc.
	4	This file is part of the GNU C Library.
	5	Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
	6
	7	The GNU C Library is free software; you can redistribute it and/or
	8	modify it under the terms of the GNU Library General Public License as
	9	published by the Free Software Foundation; either version 2 of the
	10	License, or (at your option) any later version.
	11
	12	The GNU C Library is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	Library General Public License for more details.
	16
	17	You should have received a copy of the GNU Library General Public
	18	License along with the GNU C Library; see the file COPYING.LIB. If not,
	19	write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
	21
	22	#include <ctype.h>
	23	#include <ieee754.h>
	24	#include <math.h>
	25	#include <printf.h>
	26	#include <stdlib.h>
	27	#include <stdio.h>
	28	#include "_itoa.h"
	29	#include "../locale/localeinfo.h"
	30
	31	/* #define NDEBUG 1/ / Undefine this for debugging assertions. */
	32	#include <assert.h>
	33
	34	/* This defines make it possible to use the same code for GNU C library and
	35	the GNU I/O library. */
	36	#ifdef USE_IN_LIBIO
	37	# include <libioP.h>
	38	# define PUT(f, s, n) _IO_sputn (f, s, n)
	39	# define PAD(f, c, n) _IO_padn (f, c, n)
	40	/* We use this file GNU C library and GNU I/O library. So make
	41	names equal. */
	42	# undef putc
	43	# define putc(c, f) _IO_putc_unlocked (c, f)
	44	# define size_t _IO_size_t
	45	# define FILE _IO_FILE
	46	#else /* ! USE_IN_LIBIO */
	47	# define PUT(f, s, n) fwrite (s, 1, n, f)
	48	# define PAD(f, c, n) __printf_pad (f, c, n)
	49	ssize_t __printf_pad __P ((FILE , char pad, int n)); / In vfprintf.c. */
	50	#endif /* USE_IN_LIBIO */
	51	\f
	52	/* Macros for doing the actual output. */
	53
	54	#define outchar(ch) \
	55	do \
	56	{ \
	57	register const int outc = (ch); \
	58	if (putc (outc, fp) == EOF) \
	59	return -1; \
	60	++done; \
	61	} while (0)
	62
	63	#define PRINT(ptr, len) \
	64	do \
65	{ \
66	int outlen = (len); \
67	const char *cp = (ptr); \
68	while (outlen-- > 0) \
69	outchar (*cp++); \
70	} while (0)
71
72	#define PADN(ch, len) \
73	do \
74	{ \
75	if (PAD (fp, ch, len) != len) \
76	return -1; \
77	done += len; \
78	} \
79	while (0)
80	\f
81
82	int
83	__printf_fphex (FILE *fp,
84	const struct printf_info *info,
85	const void const args)
86	{
87	/* The floating-point value to output. */
88	union
89	{
90	union ieee754_double dbl;
91	union ieee854_long_double ldbl;
92	}
93	fpnum;
94
95	/* Locale-dependent representation of decimal point. */
96	wchar_t decimal;
97
98	/* "NaN" or "Inf" for the special cases. */
99	const char *special = NULL;
100
101	/* Buffer for the generated number string for the mantissa. The
102	maximal size for the mantissa is 64 bits. */
103	char numbuf[16];
104	char *numstr;
105	char *numend;
106	int negative;
107
108	/* The maximal exponent of two in decimal notation has 5 digits. */
109	char expbuf[5];
110	char *expstr;
111	int expnegative;
112	int exponent;
113
114	/* Non-zero is mantissa is zero. */
115	int zero_mantissa;
116
117	/* The leading digit before the decimal point. */
118	char leading;
119
120	/* Precision. */
121	int precision = info->prec;
122
123	/* Width. */
124	int width = info->width;
125
126	/* Number of characters written. */
127	int done = 0;
128
129
130	/* Figure out the decimal point character. */
131	if (info->extra == 0)
132	{
133	if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),
134	strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)
135	decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
136	}
137	else
138	{
139	if (mbtowc (&decimal, _NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT),
140	strlen (_NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT))) <= 0)
141	decimal = (wchar_t) *_NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT);
142	}
143	/* Give default value. */
144	if (decimal == L'\0')
145	decimal = L'.';
146
147
148	/* Fetch the argument value. */
149	if (info->is_long_double && sizeof (long double) > sizeof (double))
150	{
151	fpnum.ldbl.d = (const long double ) args[0];
152
153	/* Check for special values: not a number or infinity. */
154	if (__isnanl (fpnum.ldbl.d))
155	{
156	special = isupper (info->spec) ? "NAN" : "nan";
157	negative = 0;
158	}
159	else
160	{
161	if (__isinfl (fpnum.ldbl.d))
162	special = isupper (info->spec) ? "INF" : "inf";
163
164	negative = fpnum.ldbl.d < 0;
165	}
166	}
167	else
168	{
169	fpnum.dbl.d = (const double ) args[0];
170
171	/* Check for special values: not a number or infinity. */
172	if (__isnan (fpnum.dbl.d))
173	{
174	special = isupper (info->spec) ? "NAN" : "nan";
175	negative = 0;
176	}
177	else
178	{
179	if (__isinf (fpnum.dbl.d))
180	special = isupper (info->spec) ? "INF" : "inf";
181
182	negative = fpnum.dbl.d < 0;
183	}
184	}
185
186	if (special)
187	{
188	int width = info->prec > info->width ? info->prec : info->width;
189
190	if (negative \|\| info->showsign \|\| info->space)
191	--width;
192	width -= 3;
193
194	if (!info->left && width > 0)
195	PADN (' ', width);
196
197	if (negative)
198	outchar ('-');
199	else if (info->showsign)
200	outchar ('+');
201	else if (info->space)
202	outchar (' ');
203
204	PRINT (special, 3);
205
206	if (info->left && width > 0)
207	PADN (' ', width);
208
209	return done;
210	}
211
212	/* We are handling here only 64 and 80 bit IEEE foating point
213	numbers. */
214	if (info->is_long_double == 0 \|\| sizeof (double) == sizeof (long double))
215	{
216	/* We have 52 bits of mantissa plus one implicit digit. Since
217	52 bits are representable without rest using hexadecimal
218	digits we use only the implicit digits for the number before
219	the decimal point. */
377a515b	220	unsigned long long int num;
2f6d1f1b	221
377a515b UD	222	num = (((unsigned long long int) fpnum.dbl.ieee.mantissa0) << 32
377a515b UD	223	\| fpnum.dbl.ieee.mantissa1);
2f6d1f1b	224
377a515b	225	zero_mantissa = num == 0;
2f6d1f1b	226
377a515b UD	227	if (sizeof (unsigned long int) > 6)
	228	numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,
	229	info->spec == 'A');
2f6d1f1b	230	else
377a515b UD	231	numstr = _itoa (num, numbuf + sizeof numbuf, 16,
377a515b UD	232	info->spec == 'A');
2f6d1f1b UD	233
	234	/* Fill with zeroes. */
	235