X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=lib%2Fhuman.c;fp=lib%2Fhuman.c;h=0000000000000000000000000000000000000000;hb=ac6caa71bc6077d75ff5073f76f97d53225e78ae;hp=a9ccf38c48312e5270889101283f65c35672afb5;hpb=1ffb4377a444fb7150030acfe843bc20cfba5d5a;p=chaz%2Ftar diff --git a/lib/human.c b/lib/human.c deleted file mode 100644 index a9ccf38..0000000 --- a/lib/human.c +++ /dev/null @@ -1,366 +0,0 @@ -/* human.c -- print human readable file size - - Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001 Free Software - Foundation, Inc. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program 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 General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -/* Originally contributed by lm@sgi.com; - --si, output block size selection, and large file support - added by eggert@twinsun.com. */ - -#if HAVE_CONFIG_H -# include -#endif - -#include -#include - -#if HAVE_LIMITS_H -# include -#endif - -#if HAVE_STRING_H -# include -#else -# include -#endif - -#ifndef CHAR_BIT -# define CHAR_BIT 8 -#endif -#if HAVE_STDLIB_H -# include -#endif - -#ifndef HAVE_DECL_GETENV -"this configure-time declaration test was not run" -#endif -#if !HAVE_DECL_GETENV -char *getenv (); -#endif - -#if ENABLE_NLS -# include -# define _(Text) gettext (Text) -#else -# define _(Text) Text -#endif - -#include -#include -#include - -#include "human.h" - -static const char suffixes[] = -{ - 0, /* not used */ - 'K', /* kibi ('k' for kilo is a special case) */ - 'M', /* mega or mebi */ - 'G', /* giga or gibi */ - 'T', /* tera or tebi */ - 'P', /* peta or pebi */ - 'E', /* exa or exbi */ - 'Z', /* zetta or 2**70 */ - 'Y' /* yotta or 2**80 */ -}; - -/* Generate into P[-1] (and possibly P[-2]) the proper suffix for - POWER and BASE. Return the address of the generated suffix. */ -static char * -generate_suffix_backwards (char *p, int power, int base) -{ - char letter = suffixes[power]; - - if (base == 1000) - { - *--p = 'B'; - if (power == 1) - letter = 'k'; - } - - *--p = letter; - return p; -} - -/* If INEXACT_STYLE is not human_round_to_even, and if easily - possible, adjust VALUE according to the style. */ -static double -adjust_value (enum human_inexact_style inexact_style, double value) -{ - /* Do not use the floor or ceil functions, as that would mean - linking with the standard math library, which is a porting pain. - So leave the value alone if it is too large to easily round. */ - if (inexact_style != human_round_to_even && value < (uintmax_t) -1) - { - uintmax_t u = value; - value = u + (inexact_style == human_ceiling && u != value); - } - - return value; -} - -/* Like human_readable_inexact, except always round to even. */ -char * -human_readable (uintmax_t n, char *buf, - int from_block_size, int output_block_size) -{ - return human_readable_inexact (n, buf, from_block_size, output_block_size, - human_round_to_even); -} - -/* Convert N to a human readable format in BUF. - - N is expressed in units of FROM_BLOCK_SIZE. FROM_BLOCK_SIZE must - be nonnegative. - - OUTPUT_BLOCK_SIZE must be nonzero. If it is positive, use units of - OUTPUT_BLOCK_SIZE in the output number. - - Use INEXACT_STYLE to determine whether to take the ceiling or floor - of any result that cannot be expressed exactly. - - If OUTPUT_BLOCK_SIZE is negative, use a format like "127K" if - possible, using powers of -OUTPUT_BLOCK_SIZE; otherwise, use - ordinary decimal format. Normally -OUTPUT_BLOCK_SIZE is either - 1000 or 1024; it must be at least 2. Most people visually process - strings of 3-4 digits effectively, but longer strings of digits are - more prone to misinterpretation. Hence, converting to an - abbreviated form usually improves readability. Use a suffix - indicating which power is being used. For example, assuming - -OUTPUT_BLOCK_SIZE is 1024, 8500 would be converted to 8.3K, - 133456345 to 127M, 56990456345 to 53G, and so on. Numbers smaller - than -OUTPUT_BLOCK_SIZE aren't modified. If -OUTPUT_BLOCK_SIZE is - 1024, append a "B" after any size letter. */ - -char * -human_readable_inexact (uintmax_t n, char *buf, - int from_block_size, int output_block_size, - enum human_inexact_style inexact_style) -{ - uintmax_t amt; - int base; - int to_block_size; - int tenths = 0; - int power; - char *p; - - /* 0 means adjusted N == AMT.TENTHS; - 1 means AMT.TENTHS < adjusted N < AMT.TENTHS + 0.05; - 2 means adjusted N == AMT.TENTHS + 0.05; - 3 means AMT.TENTHS + 0.05 < adjusted N < AMT.TENTHS + 0.1. */ - int rounding = 0; - - if (output_block_size < 0) - { - base = -output_block_size; - to_block_size = 1; - } - else - { - base = 0; - to_block_size = output_block_size; - } - - p = buf + LONGEST_HUMAN_READABLE; - *p = '\0'; - -#ifdef lint - /* Suppress `used before initialized' warning. */ - power = 0; -#endif - - /* Adjust AMT out of FROM_BLOCK_SIZE units and into TO_BLOCK_SIZE units. */ - - { - int multiplier; - int divisor; - int r2; - int r10; - if (to_block_size <= from_block_size - ? (from_block_size % to_block_size != 0 - || (multiplier = from_block_size / to_block_size, - (amt = n * multiplier) / multiplier != n)) - : (from_block_size == 0 - || to_block_size % from_block_size != 0 - || (divisor = to_block_size / from_block_size, - r10 = (n % divisor) * 10, - r2 = (r10 % divisor) * 2, - amt = n / divisor, - tenths = r10 / divisor, - rounding = r2 < divisor ? 0 < r2 : 2 + (divisor < r2), - 0))) - { - /* Either the result cannot be computed easily using uintmax_t, - or from_block_size is zero. Fall back on floating point. - FIXME: This can yield answers that are slightly off. */ - - double damt = n * (from_block_size / (double) to_block_size); - - if (! base) - sprintf (buf, "%.0f", adjust_value (inexact_style, damt)); - else - { - char suffix[3]; - char const *psuffix; - double e = 1; - power = 0; - - do - { - e *= base; - power++; - } - while (e * base <= damt && power < sizeof suffixes - 1); - - damt /= e; - - suffix[2] = '\0'; - psuffix = generate_suffix_backwards (suffix + 2, power, base); - sprintf (buf, "%.1f%s", - adjust_value (inexact_style, damt), psuffix); - if (4 + (base == 1000) < strlen (buf)) - sprintf (buf, "%.0f%s", - adjust_value (inexact_style, damt * 10) / 10, psuffix); - } - - return buf; - } - } - - /* Use power of BASE notation if adjusted AMT is large enough. */ - - if (base && base <= amt) - { - power = 0; - - do - { - int r10 = (amt % base) * 10 + tenths; - int r2 = (r10 % base) * 2 + (rounding >> 1); - amt /= base; - tenths = r10 / base; - rounding = (r2 < base - ? 0 < r2 + rounding - : 2 + (base < r2 + rounding)); - power++; - } - while (base <= amt && power < sizeof suffixes - 1); - - p = generate_suffix_backwards (p, power, base); - - if (amt < 10) - { - if (2 * (1 - (int) inexact_style) - < rounding + (tenths & (inexact_style == human_round_to_even))) - { - tenths++; - rounding = 0; - - if (tenths == 10) - { - amt++; - tenths = 0; - } - } - - if (amt < 10) - { - *--p = '0' + tenths; - *--p = '.'; - tenths = rounding = 0; - } - } - } - - if (inexact_style == human_ceiling - ? 0 < tenths + rounding - : inexact_style == human_round_to_even - ? 5 < tenths + (2 < rounding + (amt & 1)) - : /* inexact_style == human_floor */ 0) - { - amt++; - - if (amt == base && power < sizeof suffixes - 1) - { - *p = suffixes[power + 1]; - *--p = '0'; - *--p = '.'; - amt = 1; - } - } - - do - *--p = '0' + (int) (amt % 10); - while ((amt /= 10) != 0); - - return p; -} - - -/* The default block size used for output. This number may change in - the future as disks get larger. */ -#ifndef DEFAULT_BLOCK_SIZE -# define DEFAULT_BLOCK_SIZE 1024 -#endif - -static char const *const block_size_args[] = { "human-readable", "si", 0 }; -static int const block_size_types[] = { -1024, -1000 }; - -static int -default_block_size (void) -{ - return getenv ("POSIXLY_CORRECT") ? 512 : DEFAULT_BLOCK_SIZE; -} - -static strtol_error -humblock (char const *spec, int *block_size) -{ - int i; - - if (! spec && ! (spec = getenv ("BLOCK_SIZE"))) - *block_size = default_block_size (); - else if (0 <= (i = ARGMATCH (spec, block_size_args, block_size_types))) - *block_size = block_size_types[i]; - else - { - char *ptr; - unsigned long val; - strtol_error e = xstrtoul (spec, &ptr, 0, &val, "eEgGkKmMpPtTyYzZ0"); - if (e != LONGINT_OK) - return e; - if (*ptr) - return LONGINT_INVALID_SUFFIX_CHAR; - if ((int) val < 0 || val != (int) val) - return LONGINT_OVERFLOW; - *block_size = (int) val; - } - - return LONGINT_OK; -} - -void -human_block_size (char const *spec, int report_errors, int *block_size) -{ - strtol_error e = humblock (spec, block_size); - if (*block_size == 0) - { - *block_size = default_block_size (); - e = LONGINT_INVALID; - } - if (e != LONGINT_OK && report_errors) - STRTOL_FATAL_ERROR (spec, _("block size"), e); -}