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