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87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/* human.h -- print human readable file size
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Paul Eggert and Larry McVoy. */
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#ifndef HUMAN_H_
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# define HUMAN_H_ 1
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# include <limits.h>
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# include <stdbool.h>
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# if HAVE_STDINT_H
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# include <stdint.h>
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# endif
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# include <unistd.h>
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/* A conservative bound on the maximum length of a human-readable string.
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The output can be the square of the largest uintmax_t, so double
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its size before converting to a bound.
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log10 (2.0) < 146/485. Add 1 for integer division truncation.
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Also, the output can have a thousands separator between every digit,
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so multiply by MB_LEN_MAX + 1 and then subtract MB_LEN_MAX.
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Append 1 for a space before the suffix.
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Finally, append 3, the maximum length of a suffix. */
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# define LONGEST_HUMAN_READABLE \
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((2 * sizeof (uintmax_t) * CHAR_BIT * 146 / 485 + 1) * (MB_LEN_MAX + 1) \
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- MB_LEN_MAX + 1 + 3)
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/* Options for human_readable. */
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enum
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{
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/* Unless otherwise specified these options may be ORed together. */
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/* The following three options are mutually exclusive. */
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/* Round to plus infinity (default). */
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human_ceiling = 0,
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/* Round to nearest, ties to even. */
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human_round_to_nearest = 1,
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/* Round to minus infinity. */
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human_floor = 2,
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/* Group digits together, e.g. `1,000,000'. This uses the
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locale-defined grouping; the traditional C locale does not group,
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so this has effect only if some other locale is in use. */
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human_group_digits = 4,
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/* When autoscaling, suppress ".0" at end. */
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human_suppress_point_zero = 8,
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/* Scale output and use SI-style units, ignoring the output block size. */
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human_autoscale = 16,
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/* Prefer base 1024 to base 1000. */
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human_base_1024 = 32,
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/* Prepend " " before unit symbol. */
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human_space_before_unit = 64,
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/* Append SI prefix, e.g. "k" or "M". */
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human_SI = 128,
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/* Append "B" (if base 1000) or "iB" (if base 1024) to SI prefix. */
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human_B = 256
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};
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char *human_readable (uintmax_t, char *, int, uintmax_t, uintmax_t);
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int human_options (char const *, bool, uintmax_t *);
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#endif /* HUMAN_H_ */
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