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gcc/libquadmath/printf/quadmath-printf.c

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/* GCC Quad-Precision Math Library
Copyright (C) 2011 Free Software Foundation, Inc.
Written by Jakub Jelinek <jakub@redhat.com>
This file is part of the libquadmath library.
Libquadmath 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.
Libquadmath 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 libquadmath; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#include <config.h>
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include "quadmath-printf.h"
/* Read a simple integer from a string and update the string pointer.
It is assumed that the first character is a digit. */
static unsigned int
read_int (const char **pstr)
{
unsigned int retval = (unsigned char) **pstr - '0';
while (isdigit ((unsigned char) *++(*pstr)))
{
retval *= 10;
retval += (unsigned char) **pstr - '0';
}
return retval;
}
#define PADSIZE 16
static char const blanks[PADSIZE] =
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
static char const zeroes[PADSIZE] =
{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
static wchar_t const wblanks[PADSIZE] =
{
L_(' '), L_(' '), L_(' '), L_(' '), L_(' '), L_(' '), L_(' '), L_(' '),
L_(' '), L_(' '), L_(' '), L_(' '), L_(' '), L_(' '), L_(' '), L_(' ')
};
static wchar_t const wzeroes[PADSIZE] =
{
L_('0'), L_('0'), L_('0'), L_('0'), L_('0'), L_('0'), L_('0'), L_('0'),
L_('0'), L_('0'), L_('0'), L_('0'), L_('0'), L_('0'), L_('0'), L_('0')
};
attribute_hidden size_t
__quadmath_do_pad (struct __quadmath_printf_file *fp, int wide, int c,
size_t n)
{
ssize_t i;
char padbuf[PADSIZE];
wchar_t wpadbuf[PADSIZE];
const char *padstr;
size_t w, written = 0;
if (wide)
{
if (c == ' ')
padstr = (const char *) wblanks;
else if (c == '0')
padstr = (const char *) wzeroes;
else
{
padstr = (const char *) wpadbuf;
for (i = 0; i < PADSIZE; i++)
wpadbuf[i] = c;
}
}
else
{
if (c == ' ')
padstr = blanks;
else if (c == '0')
padstr = zeroes;
else
{
padstr = (const char *) padbuf;
for (i = 0; i < PADSIZE; i++)
padbuf[i] = c;
}
}
for (i = n; i >= PADSIZE; i -= PADSIZE)
{
w = PUT (fp, (char *) padstr, PADSIZE);
written += w;
if (w != PADSIZE)
return written;
}
if (i > 0)
{
w = PUT (fp, (char *) padstr, i);
written += w;
}
return written;
}
/* This is a stripped down version of snprintf, which just handles
a single %eEfFgGaA format entry with Q modifier. % has to be
the first character of the format string, no $ can be used. */
int
quadmath_snprintf (char *str, size_t size, const char *format, ...)
{
struct printf_info info;
va_list ap;
__float128 fpnum, *fpnum_addr = &fpnum, **fpnum_addr2 = &fpnum_addr;
struct __quadmath_printf_file qfp;
if (*format++ != '%')
return -1;
/* Clear information structure. */
memset (&info, '\0', sizeof info);
/* info.alt = 0;
info.space = 0;
info.left = 0;
info.showsign = 0;
info.group = 0;
info.i18n = 0;
info.extra = 0; */
info.pad = ' ';
/* info.wide = 0; */
/* Check for spec modifiers. */
do
{
switch (*format)
{
case ' ':
/* Output a space in place of a sign, when there is no sign. */
info.space = 1;
continue;
case '+':
/* Always output + or - for numbers. */
info.showsign = 1;
continue;
case '-':
/* Left-justify things. */
info.left = 1;
continue;
case '#':
/* Use the "alternate form":
Hex has 0x or 0X, FP always has a decimal point. */
info.alt = 1;
continue;
case '0':
/* Pad with 0s. */
info.pad = '0';
continue;
case '\'':
/* Show grouping in numbers if the locale information
indicates any. */
info.group = 1;
continue;
case 'I':
/* Use the internationalized form of the output. Currently
means to use the `outdigits' of the current locale. */
info.i18n = 1;
continue;
default:
break;
}
break;
}
while (*++format);
if (info.left)
info.pad = ' ';
va_start (ap, format);
/* Get the field width. */
/* info.width = 0; */
if (*format == '*')
{
/* The field width is given in an argument.
A negative field width indicates left justification. */
++format;
info.width = va_arg (ap, int);
}
else if (isdigit (*format))
/* Constant width specification. */
info.width = read_int (&format);
/* Get the precision. */
/* -1 means none given; 0 means explicit 0. */
info.prec = -1;
if (*format == '.')
{
++format;
if (*format == '*')
{
/* The precision is given in an argument. */
++format;
info.prec = va_arg (ap, int);
}
else if (isdigit (*format))
info.prec = read_int (&format);
else
/* "%.?" is treated like "%.0?". */
info.prec = 0;
}
/* Check for type modifiers. */
/* info.is_long_double = 0;
info.is_short = 0;
info.is_long = 0;
info.is_char = 0;
info.user = 0; */
/* We require Q modifier. */
if (*format++ != 'Q')
{
va_end (ap);
return -1;
}
/* Get the format specification. */
info.spec = (wchar_t) *format++;
if (info.spec == L_('\0') || *format != '\0')
{
va_end (ap);
return -1;
}
switch (info.spec)
{
case L_('e'):
case L_('E'):
case L_('f'):
case L_('F'):
case L_('g'):
case L_('G'):
case L_('a'):
case L_('A'):
break;
default:
va_end (ap);
return -1;
}
fpnum = va_arg (ap, __float128);
va_end (ap);
qfp.fp = NULL;
qfp.str = str;
qfp.size = size ? size - 1 : 0;
qfp.len = 0;
qfp.file_p = 0;
if (info.spec == L_('a') || info.spec == L_('A'))
__quadmath_printf_fphex (&qfp, &info, (const void *const *)&fpnum_addr2);
else
__quadmath_printf_fp (&qfp, &info, (const void *const *)&fpnum_addr2);
if (size)
*qfp.str = '\0';
return qfp.len;
}
#ifdef HAVE_PRINTF_HOOKS
static int pa_flt128;
int mod_Q attribute_hidden;
static void
flt128_va (void *mem, va_list *ap)
{
__float128 d = va_arg (*ap, __float128);
memcpy (mem, &d, sizeof (d));
}
static int
flt128_ais (const struct printf_info *info, size_t n __attribute__ ((unused)),
int *argtype, int *size)
{
if (info->user & mod_Q)
{
argtype[0] = pa_flt128;
size[0] = sizeof (__float128);
return 1;
}
#if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 13)
/* Workaround bug in glibc printf hook handling. */
size[0] = -1;
switch (info->spec)
{
case L_('i'):
case L_('d'):
case L_('u'):
case L_('o'):
case L_('X'):
case L_('x'):
#if __LONG_MAX__ != __LONG_LONG_MAX__
if (info->is_long_double)
argtype[0] = PA_INT|PA_FLAG_LONG_LONG;
else
#endif
if (info->is_long)
argtype[0] = PA_INT|PA_FLAG_LONG;
else if (info->is_short)
argtype[0] = PA_INT|PA_FLAG_SHORT;
else if (info->is_char)
argtype[0] = PA_CHAR;
else
argtype[0] = PA_INT;
return 1;
case L_('e'):
case L_('E'):
case L_('f'):
case L_('F'):
case L_('g'):
case L_('G'):
case L_('a'):
case L_('A'):
if (info->is_long_double)
argtype[0] = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
else
argtype[0] = PA_DOUBLE;
return 1;
case L_('c'):
argtype[0] = PA_CHAR;
return 1;
case L_('C'):
argtype[0] = PA_WCHAR;
return 1;
case L_('s'):
argtype[0] = PA_STRING;
return 1;
case L_('S'):
argtype[0] = PA_WSTRING;
return 1;
case L_('p'):
argtype[0] = PA_POINTER;
return 1;
case L_('n'):
argtype[0] = PA_INT|PA_FLAG_PTR;
return 1;
case L_('m'):
default:
/* An unknown spec will consume no args. */
return 0;
}
#endif
return -1;
}
static int
flt128_printf_fp (FILE *fp, const struct printf_info *info,
const void *const *args)
{
struct __quadmath_printf_file qpf
= { .fp = fp, .str = NULL, .size = 0, .len = 0, .file_p = 1 };
if ((info->user & mod_Q) == 0)
return -2;
return __quadmath_printf_fp (&qpf, info, args);
}
static int
flt128_printf_fphex (FILE *fp, const struct printf_info *info,
const void *const *args)
{
struct __quadmath_printf_file qpf
= { .fp = fp, .str = NULL, .size = 0, .len = 0, .file_p = 1 };
if ((info->user & mod_Q) == 0)
return -2;
return __quadmath_printf_fphex (&qpf, info, args);
}
__attribute__((constructor)) static void
register_printf_flt128 (void)
{
pa_flt128 = register_printf_type (flt128_va);
if (pa_flt128 == -1)
return;
mod_Q = register_printf_modifier (L_("Q"));
if (mod_Q == -1)
return;
register_printf_specifier ('f', flt128_printf_fp, flt128_ais);
register_printf_specifier ('F', flt128_printf_fp, flt128_ais);
register_printf_specifier ('e', flt128_printf_fp, flt128_ais);
register_printf_specifier ('E', flt128_printf_fp, flt128_ais);
register_printf_specifier ('g', flt128_printf_fp, flt128_ais);
register_printf_specifier ('G', flt128_printf_fp, flt128_ais);
register_printf_specifier ('a', flt128_printf_fphex, flt128_ais);
register_printf_specifier ('A', flt128_printf_fphex, flt128_ais);
}
__attribute__((destructor)) static void
unregister_printf_flt128 (void)
{
/* No way to unregister printf type and modifier currently,
and only one printf specifier can be registered right now. */
if (pa_flt128 == -1 || mod_Q == -1)
return;
register_printf_specifier ('f', NULL, NULL);
register_printf_specifier ('F', NULL, NULL);
register_printf_specifier ('e', NULL, NULL);
register_printf_specifier ('E', NULL, NULL);
register_printf_specifier ('g', NULL, NULL);
register_printf_specifier ('G', NULL, NULL);
register_printf_specifier ('a', NULL, NULL);
register_printf_specifier ('A', NULL, NULL);
}
#endif
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