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/* Print size value using units for orders of magnitude.
Copyright (C) 1997-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
Based on a proposal by Larry McVoy <lm@sgi.com>.
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, see
<http://www.gnu.org/licenses/>. */
#include <ctype.h>
#include <ieee754.h>
#include <math.h>
#include <printf.h>
#include <libioP.h>
/* This defines make it possible to use the same code for GNU C library and
the GNU I/O library. */
#define PUT(f, s, n) _IO_sputn (f, s, n)
#define PAD(f, c, n) (wide ? _IO_wpadn (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) (wide \
? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f))
#define size_t _IO_size_t
#define FILE _IO_FILE
/* Macros for doing the actual output. */
#define outchar(ch) \
do \
{ \
const int outc = (ch); \
if (putc (outc, fp) == EOF) \
return -1; \
++done; \
} while (0)
#define PRINT(ptr, wptr, len) \
do \
{ \
size_t outlen = (len); \
if (len > 20) \
{ \
if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \
return -1; \
ptr += outlen; \
done += outlen; \
} \
else \
{ \
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)
/* Prototype for helper functions. */
extern int __printf_fp (FILE *fp, const struct printf_info *info,
const void *const *args);
int
__printf_size (FILE *fp, const struct printf_info *info,
const void *const *args)
{
/* Units for the both formats. */
#define BINARY_UNITS " kmgtpezy"
#define DECIMAL_UNITS " KMGTPEZY"
static const char units[2][sizeof (BINARY_UNITS)] =
{
BINARY_UNITS, /* For binary format. */
DECIMAL_UNITS /* For decimal format. */
};
const char *tag = units[isupper (info->spec) != 0];
int divisor = isupper (info->spec) ? 1000 : 1024;
/* The floating-point value to output. */
union
{
union ieee754_double dbl;
long double ldbl;
#if __HAVE_DISTINCT_FLOAT128
_Float128 f128;
#endif
}
fpnum;
const void *ptr = &fpnum;
int is_neg = 0;
/* "NaN" or "Inf" for the special cases. */
const char *special = NULL;
const wchar_t *wspecial = NULL;
struct printf_info fp_info;
int done = 0;
int wide = info->wide;
#define PRINTF_SIZE_FETCH(FLOAT, VAR) \
{ \
(VAR) = *(const FLOAT *) args[0]; \
\
/* Check for special values: not a number or infinity. */ \
if (isnan (VAR)) \
{ \
special = "nan"; \
wspecial = L"nan"; \
/* is_neg = 0; Already zero */ \
} \
else if (isinf (VAR)) \
{ \
is_neg = signbit (VAR); \
special = "inf"; \
wspecial = L"inf"; \
} \
else \
while ((VAR) >= divisor && tag[1] != '\0') \
{ \
(VAR) /= divisor; \
++tag; \
} \
}
/* Fetch the argument value. */
#if __HAVE_DISTINCT_FLOAT128
if (info->is_binary128)
PRINTF_SIZE_FETCH (_Float128, fpnum.f128)
else
#endif
#ifndef __NO_LONG_DOUBLE_MATH
if (info->is_long_double && sizeof (long double) > sizeof (double))
PRINTF_SIZE_FETCH (long double, fpnum.ldbl)
else
#endif
PRINTF_SIZE_FETCH (double, fpnum.dbl.d)
#undef PRINTF_SIZE_FETCH
if (special)
{
int width = info->prec > info->width ? info->prec : info->width;
if (is_neg || info->showsign || info->space)
--width;
width -= 3;
if (!info->left && width > 0)
PADN (' ', width);
if (is_neg)
outchar ('-');
else if (info->showsign)
outchar ('+');
else if (info->space)
outchar (' ');
PRINT (special, wspecial, 3);
if (info->left && width > 0)
PADN (' ', width);
return done;
}
/* Prepare to print the number. We want to use `__printf_fp' so we
have to prepare a `printf_info' structure. */
fp_info = *info;
fp_info.spec = 'f';
fp_info.prec = info->prec < 0 ? 3 : info->prec;
fp_info.wide = wide;
if (fp_info.left && fp_info.pad == L' ')
{
/* We must do the padding ourself since the unit character must
be placed before the padding spaces. */
fp_info.width = 0;
done = __printf_fp (fp, &fp_info, &ptr);
if (done > 0)
{
outchar (*tag);
if (info->width > done)
PADN (' ', info->width - done);
}
}
else
{
/* We can let __printf_fp do all the printing and just add our
unit character afterwards. */
fp_info.width = info->width - 1;
done = __printf_fp (fp, &fp_info, &ptr);
if (done > 0)
outchar (*tag);
}
return done;
}
ldbl_strong_alias (__printf_size, printf_size);
/* This is the function used by `vfprintf' to determine number and
type of the arguments. */
int
printf_size_info (const struct printf_info *info, size_t n, int *argtypes)
{
/* We need only one double or long double argument. */
if (n >= 1)
argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0);
return 1;
}
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