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glibc/stdio-common/printf_size.c
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/* Print size value using units for orders of magnitude. | |
Copyright (C) 1997-2015 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; | |
} | |
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; | |
/* Fetch the argument value. */ | |
#ifndef __NO_LONG_DOUBLE_MATH | |
if (info->is_long_double && sizeof (long double) > sizeof (double)) | |
{ | |
fpnum.ldbl = *(const long double *) args[0]; | |
/* Check for special values: not a number or infinity. */ | |
if (isnan (fpnum.ldbl)) | |
{ | |
special = "nan"; | |
wspecial = L"nan"; | |
// is_neg = 0; Already zero | |
} | |
else if (isinf (fpnum.ldbl)) | |
{ | |
is_neg = signbit (fpnum.ldbl); | |
special = "inf"; | |
wspecial = L"inf"; | |
} | |
else | |
while (fpnum.ldbl >= divisor && tag[1] != '\0') | |
{ | |
fpnum.ldbl /= divisor; | |
++tag; | |
} | |
} | |
else | |
#endif /* no long double */ | |
{ | |
fpnum.dbl.d = *(const double *) args[0]; | |
/* Check for special values: not a number or infinity. */ | |
if (isnan (fpnum.dbl.d)) | |
{ | |
special = "nan"; | |
wspecial = L"nan"; | |
// is_neg = 0; Already zero | |
} | |
else if (isinf (fpnum.dbl.d)) | |
{ | |
is_neg = signbit (fpnum.dbl.d); | |
special = "inf"; | |
wspecial = L"inf"; | |
} | |
else | |
while (fpnum.dbl.d >= divisor && tag[1] != '\0') | |
{ | |
fpnum.dbl.d /= divisor; | |
++tag; | |
} | |
} | |
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; | |
} |