253 lines
6.5 KiB
C
253 lines
6.5 KiB
C
/* Print size value using units for orders of magnitude.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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Based on a proposal by Larry McVoy <lm@sgi.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <ctype.h>
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#include <ieee754.h>
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#include <math.h>
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#include <printf.h>
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#ifdef USE_IN_LIBIO
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# include <libioP.h>
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#else
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# include <stdio.h>
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#endif
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/* This defines make it possible to use the same code for GNU C library and
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the GNU I/O library. */
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#ifdef USE_IN_LIBIO
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# define PUT(f, s, n) _IO_sputn (f, s, n)
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# define PAD(f, c, n) _IO_padn (f, c, n)
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/* We use this file GNU C library and GNU I/O library. So make
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names equal. */
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# undef putc
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# define putc(c, f) _IO_putc_unlocked (c, f)
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# define size_t _IO_size_t
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# define FILE _IO_FILE
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#else /* ! USE_IN_LIBIO */
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# define PUT(f, s, n) fwrite (s, 1, n, f)
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# define PAD(f, c, n) __printf_pad (f, c, n)
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ssize_t __printf_pad __P ((FILE *, char pad, int n)); /* In vfprintf.c. */
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#endif /* USE_IN_LIBIO */
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/* Macros for doing the actual output. */
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#define outchar(ch) \
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do \
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{ \
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register const int outc = (ch); \
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if (putc (outc, fp) == EOF) \
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return -1; \
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++done; \
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} while (0)
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#define PRINT(ptr, len) \
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do \
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{ \
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register size_t outlen = (len); \
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if (len > 20) \
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{ \
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if (PUT (fp, ptr, outlen) != outlen) \
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return -1; \
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ptr += outlen; \
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done += outlen; \
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} \
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else \
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{ \
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while (outlen-- > 0) \
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outchar (*ptr++); \
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} \
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} while (0)
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#define PADN(ch, len) \
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do \
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{ \
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if (PAD (fp, ch, len) != len) \
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return -1; \
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done += len; \
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} \
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while (0)
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/* Prototype for helper functions. */
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extern int __printf_fp (FILE *fp, const struct printf_info *info,
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const void *const *args);
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int
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printf_size (FILE *fp, const struct printf_info *info, const void *const *args)
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{
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/* Units for the both formats. */
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#define BINARY_UNITS " kmgtpezy"
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#define DECIMAL_UNITS " KMGTPEZY"
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static const char units[2][sizeof (BINARY_UNITS)] =
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{
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BINARY_UNITS, /* For binary format. */
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DECIMAL_UNITS /* For decimal format. */
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};
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const char *tag = units[isupper (info->spec) != 0];
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int divisor = isupper (info->spec) ? 1000 : 1024;
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/* The floating-point value to output. */
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union
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{
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union ieee754_double dbl;
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union ieee854_long_double ldbl;
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}
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fpnum;
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const void *ptr = &fpnum;
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int negative = 0;
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/* "NaN" or "Inf" for the special cases. */
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const char *special = NULL;
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struct printf_info fp_info;
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int done = 0;
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/* Fetch the argument value. */
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if (info->is_long_double && sizeof (long double) > sizeof (double))
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{
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fpnum.ldbl.d = *(const long double *) args[0];
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/* Check for special values: not a number or infinity. */
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if (__isnanl (fpnum.ldbl.d))
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{
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special = "nan";
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negative = 0;
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}
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else if (__isinfl (fpnum.ldbl.d))
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{
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special = "inf";
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negative = fpnum.ldbl.d < 0;
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}
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else
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while (fpnum.ldbl.d >= divisor && tag[1] != '\0')
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{
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fpnum.ldbl.d /= divisor;
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++tag;
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}
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}
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else
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{
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fpnum.dbl.d = *(const double *) args[0];
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/* Check for special values: not a number or infinity. */
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if (__isnan (fpnum.dbl.d))
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{
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special = "nan";
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negative = 0;
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}
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else if (__isinf (fpnum.dbl.d))
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{
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special = "inf";
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negative = fpnum.dbl.d < 0;
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}
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else
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while (fpnum.dbl.d >= divisor && tag[1] != '\0')
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{
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fpnum.dbl.d /= divisor;
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++tag;
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}
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}
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if (special)
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{
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int width = info->prec > info->width ? info->prec : info->width;
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if (negative || info->showsign || info->space)
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--width;
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width -= 3;
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if (!info->left && width > 0)
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PADN (' ', width);
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if (negative)
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outchar ('-');
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else if (info->showsign)
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outchar ('+');
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else if (info->space)
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outchar (' ');
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PRINT (special, 3);
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if (info->left && width > 0)
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PADN (' ', width);
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return done;
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}
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/* Prepare to print the number. We want to use `__printf_fp' so we
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have to prepare a `printf_info' structure. */
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fp_info.spec = 'f';
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fp_info.prec = info->prec < 0 ? 3 : info->prec;
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fp_info.is_long_double = info->is_long_double;
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fp_info.is_short = info->is_short;
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fp_info.is_long = info->is_long;
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fp_info.alt = info->alt;
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fp_info.space = info->space;
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fp_info.left = info->left;
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fp_info.showsign = info->showsign;
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fp_info.group = info->group;
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fp_info.extra = info->extra;
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fp_info.pad = info->pad;
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if (fp_info.left && fp_info.pad == L' ')
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{
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/* We must do the padding ourself since the unit character must
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be placed before the padding spaces. */
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fp_info.width = 0;
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done = __printf_fp (fp, &fp_info, &ptr);
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if (done > 0)
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{
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outchar (*tag);
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if (info->width > done)
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PADN (' ', info->width - done);
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}
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}
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else
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{
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/* We can let __printf_fp do all the printing and just add our
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unit character afterwards. */
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fp_info.width = info->width - 1;
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done = __printf_fp (fp, &fp_info, &ptr);
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if (done > 0)
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outchar (*tag);
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}
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return done;
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}
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/* This is the function used by `vfprintf' to determine number and
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type of the arguments. */
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int
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printf_size_info (const struct printf_info *info, size_t n, int *argtypes)
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{
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/* We need only one double or long double argument. */
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if (n >= 1)
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argtypes[0] = PA_DOUBLE | (info->is_long_double ? PA_FLAG_LONG_DOUBLE : 0);
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return 1;
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}
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