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annotate lib/human.c @ 2590:a3c74265aa47

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(human_readable_inexact): Allow an input block size that is not a multiple of the output block size, and vice versa.
author Jim Meyering <jim@meyering.net>
date Thu, 15 Jun 2000 12:21:10 +0000
parents d68da7d92089
children 3ebe28cfe9b4
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1 /* human.c -- print human readable file size
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2 Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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17
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18 /* Originally contributed by lm@sgi.com;
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19 --si, output block size selection, and large file support
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20 added by eggert@twinsun.com. */
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21
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22 #if HAVE_CONFIG_H
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23 # include <config.h>
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24 #endif
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25
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26 #include <sys/types.h>
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27 #include <stdio.h>
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28
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29 #if HAVE_LIMITS_H
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30 # include <limits.h>
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31 #endif
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32
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33 #if HAVE_STRING_H
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34 # include <string.h>
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35 #else
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36 # include <strings.h>
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37 #endif
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38
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39 #ifndef CHAR_BIT
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40 # define CHAR_BIT 8
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41 #endif
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42 #if HAVE_STDLIB_H
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43 # include <stdlib.h>
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44 #endif
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45
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46 #ifndef HAVE_DECL_GETENV
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47 "this configure-time declaration test was not run"
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48 #endif
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49 #if !HAVE_DECL_GETENV
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50 char *getenv ();
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51 #endif
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52
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53 #if ENABLE_NLS
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54 # include <libintl.h>
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55 # define _(Text) gettext (Text)
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56 #else
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57 # define _(Text) Text
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58 #endif
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59
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60 #include <argmatch.h>
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61 #include <error.h>
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62 #include <xstrtol.h>
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63
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64 #include "human.h"
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65
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66 static const char suffixes[] =
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67 {
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68 0, /* not used */
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69 'k', /* kilo */
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70 'M', /* Mega */
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71 'G', /* Giga */
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72 'T', /* Tera */
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73 'P', /* Peta */
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74 'E', /* Exa */
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75 'Z', /* Zetta */
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76 'Y' /* Yotta */
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77 };
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78
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79 /* Like human_readable_inexact, except always round to even. */
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80 char *
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81 human_readable (uintmax_t n, char *buf,
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82 int from_block_size, int output_block_size)
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83 {
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84 return human_readable_inexact (n, buf, from_block_size, output_block_size,
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85 human_round_to_even);
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86 }
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87
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88 /* Convert N to a human readable format in BUF.
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89
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90 N is expressed in units of FROM_BLOCK_SIZE. FROM_BLOCK_SIZE must
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91 be nonnegative.
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92
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93 OUTPUT_BLOCK_SIZE must be nonzero. If it is positive, use units of
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94 OUTPUT_BLOCK_SIZE in the output number.
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95
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96 Use INEXACT_STYLE to determine whether to take the ceiling or floor
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97 of any result that cannot be expressed exactly.
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98
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99 If OUTPUT_BLOCK_SIZE is negative, use a format like "127k" if
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100 possible, using powers of -OUTPUT_BLOCK_SIZE; otherwise, use
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101 ordinary decimal format. Normally -OUTPUT_BLOCK_SIZE is either
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102 1000 or 1024; it must be at least 2. Most people visually process
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103 strings of 3-4 digits effectively, but longer strings of digits are
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104 more prone to misinterpretation. Hence, converting to an
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105 abbreviated form usually improves readability. Use a suffix
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106 indicating which power is being used. For example, assuming
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107 -OUTPUT_BLOCK_SIZE is 1024, 8500 would be converted to 8.3k,
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108 133456345 to 127M, 56990456345 to 53G, and so on. Numbers smaller
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109 than -OUTPUT_BLOCK_SIZE aren't modified. */
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110
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111 char *
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112 human_readable_inexact (uintmax_t n, char *buf,
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113 int from_block_size, int output_block_size,
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114 enum human_inexact_style inexact_style)
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115 {
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116 uintmax_t amt;
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117 int base;
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118 int to_block_size;
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119 int tenths = 0;
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120 int multiplier;
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121 int divisor;
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122 int r2;
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123 int r10;
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124 int power;
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125 char *p;
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126
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127 /* 0 means adjusted N == AMT.TENTHS;
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128 1 means AMT.TENTHS < adjusted N < AMT.TENTHS + 0.05;
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129 2 means adjusted N == AMT.TENTHS + 0.05;
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130 3 means AMT.TENTHS + 0.05 < adjusted N < AMT.TENTHS + 0.1. */
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131 int rounding = 0;
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132
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133 if (output_block_size < 0)
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134 {
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135 base = -output_block_size;
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136 to_block_size = 1;
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137 }
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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138 else
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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139 {
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140 base = 0;
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141 to_block_size = output_block_size;
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142 }
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143
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144 p = buf + LONGEST_HUMAN_READABLE;
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145 *p = '\0';
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146
ff40370aead6 (human_readable): Convert to ANSI-style definition.
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147 #ifdef lint
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148 /* Suppress `used before initialized' warning. */
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149 power = 0;
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150 #endif
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151
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152 /* Adjust AMT out of FROM_BLOCK_SIZE units and into TO_BLOCK_SIZE units. */
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153
2590
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154 if (to_block_size <= from_block_size
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155 ? (from_block_size % to_block_size != 0
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156 || (multiplier = from_block_size / to_block_size,
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157 (amt = n * multiplier) / multiplier != n))
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158 : (from_block_size == 0
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159 || to_block_size % from_block_size != 0
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160 || (divisor = to_block_size / from_block_size,
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161 r10 = (n % divisor) * 10,
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162 r2 = (r10 % divisor) * 2,
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163 amt = n / divisor,
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164 tenths = r10 / divisor,
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165 rounding = r2 < divisor ? 0 < r2 : 2 + (divisor < r2),
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166 0)))
1137
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167 {
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168 /* Either the result cannot be computed easily using uintmax_t,
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169 or from_block_size is zero. Fall back on floating point.
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170 FIXME: This can yield answers that are slightly off. */
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171
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172 double damt = n * (from_block_size / (double) to_block_size);
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173
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174 if (! base)
a3c74265aa47 (human_readable_inexact): Allow an input block
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175 sprintf (buf, "%.0f", damt);
a3c74265aa47 (human_readable_inexact): Allow an input block
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176 else
a3c74265aa47 (human_readable_inexact): Allow an input block
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177 {
a3c74265aa47 (human_readable_inexact): Allow an input block
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178 double e = 1;
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179 power = 0;
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180
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181 do
a3c74265aa47 (human_readable_inexact): Allow an input block
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182 {
a3c74265aa47 (human_readable_inexact): Allow an input block
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183 e *= base;
a3c74265aa47 (human_readable_inexact): Allow an input block
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184 power++;
a3c74265aa47 (human_readable_inexact): Allow an input block
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185 }
a3c74265aa47 (human_readable_inexact): Allow an input block
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186 while (e * base <= damt && power < sizeof suffixes - 1);
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187
a3c74265aa47 (human_readable_inexact): Allow an input block
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188 damt /= e;
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189
a3c74265aa47 (human_readable_inexact): Allow an input block
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190 sprintf (buf, "%.1f%c", damt, suffixes[power]);
a3c74265aa47 (human_readable_inexact): Allow an input block
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191 if (4 < strlen (buf))
a3c74265aa47 (human_readable_inexact): Allow an input block
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192 sprintf (buf, "%.0f%c", damt, suffixes[power]);
1137
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193 }
2590
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194
a3c74265aa47 (human_readable_inexact): Allow an input block
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195 return buf;
1137
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196 }
1142
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197
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198 /* Use power of BASE notation if adjusted AMT is large enough. */
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199
2c9059ccc457 New file. The interface is inspired
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200 if (base && base <= amt)
2c9059ccc457 New file. The interface is inspired
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201 {
2c9059ccc457 New file. The interface is inspired
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202 power = 0;
2c9059ccc457 New file. The interface is inspired
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parents:
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203
2c9059ccc457 New file. The interface is inspired
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204 do
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parents:
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205 {
2c9059ccc457 New file. The interface is inspired
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diff changeset
206 int r10 = (amt % base) * 10 + tenths;
2c9059ccc457 New file. The interface is inspired
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207 int r2 = (r10 % base) * 2 + (rounding >> 1);
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208 amt /= base;
2c9059ccc457 New file. The interface is inspired
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209 tenths = r10 / base;
2c9059ccc457 New file. The interface is inspired
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diff changeset
210 rounding = (r2 < base
2c9059ccc457 New file. The interface is inspired
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211 ? 0 < r2 + rounding
2c9059ccc457 New file. The interface is inspired
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212 : 2 + (base < r2 + rounding));
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213 power++;
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214 }
2c9059ccc457 New file. The interface is inspired
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215 while (base <= amt && power < sizeof suffixes - 1);
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216
2c9059ccc457 New file. The interface is inspired
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217 *--p = suffixes[power];
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218
2c9059ccc457 New file. The interface is inspired
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219 if (amt < 10)
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diff changeset
220 {
1863
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diff changeset
221 if (2 * (1 - (int) inexact_style)
e6b535c4a46e (human_readable): New function.
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parents: 1848
diff changeset
222 < rounding + (tenths & (inexact_style == human_round_to_even)))
e6b535c4a46e (human_readable): New function.
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parents: 1848
diff changeset
223 {
e6b535c4a46e (human_readable): New function.
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diff changeset
224 tenths++;
e6b535c4a46e (human_readable): New function.
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diff changeset
225 rounding = 0;
1137
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226
1863
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diff changeset
227 if (tenths == 10)
e6b535c4a46e (human_readable): New function.
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diff changeset
228 {
e6b535c4a46e (human_readable): New function.
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diff changeset
229 amt++;
e6b535c4a46e (human_readable): New function.
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diff changeset
230 tenths = 0;
e6b535c4a46e (human_readable): New function.
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diff changeset
231 }
1137
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232 }
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233
2c9059ccc457 New file. The interface is inspired
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diff changeset
234 if (amt < 10)
2c9059ccc457 New file. The interface is inspired
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parents:
diff changeset
235 {
2c9059ccc457 New file. The interface is inspired
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236 *--p = '0' + tenths;
2c9059ccc457 New file. The interface is inspired
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237 *--p = '.';
1863
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diff changeset
238 tenths = rounding = 0;
1137
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239 }
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parents:
diff changeset
240 }
2c9059ccc457 New file. The interface is inspired
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diff changeset
241 }
1142
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242
1863
e6b535c4a46e (human_readable): New function.
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diff changeset
243 if (inexact_style == human_ceiling
e6b535c4a46e (human_readable): New function.
Jim Meyering <jim@meyering.net>
parents: 1848
diff changeset
244 ? 0 < tenths + rounding
e6b535c4a46e (human_readable): New function.
Jim Meyering <jim@meyering.net>
parents: 1848
diff changeset
245 : inexact_style == human_round_to_even
e6b535c4a46e (human_readable): New function.
Jim Meyering <jim@meyering.net>
parents: 1848
diff changeset
246 ? 5 < tenths + (2 < rounding + (amt & 1))
e6b535c4a46e (human_readable): New function.
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diff changeset
247 : /* inexact_style == human_floor */ 0)
1137
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248 {
2c9059ccc457 New file. The interface is inspired
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diff changeset
249 amt++;
2c9059ccc457 New file. The interface is inspired
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diff changeset
250
2c9059ccc457 New file. The interface is inspired
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diff changeset
251 if (amt == base && power < sizeof suffixes - 1)
2c9059ccc457 New file. The interface is inspired
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diff changeset
252 {
2c9059ccc457 New file. The interface is inspired
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253 *p = suffixes[power + 1];
2c9059ccc457 New file. The interface is inspired
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diff changeset
254 *--p = '0';
2c9059ccc457 New file. The interface is inspired
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diff changeset
255 *--p = '.';
2c9059ccc457 New file. The interface is inspired
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parents:
diff changeset
256 amt = 1;
2c9059ccc457 New file. The interface is inspired
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diff changeset
257 }
2c9059ccc457 New file. The interface is inspired
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diff changeset
258 }
2c9059ccc457 New file. The interface is inspired
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parents:
diff changeset
259
2c9059ccc457 New file. The interface is inspired
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parents:
diff changeset
260 do
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diff changeset
261 *--p = '0' + (int) (amt % 10);
2c9059ccc457 New file. The interface is inspired
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parents:
diff changeset
262 while ((amt /= 10) != 0);
2c9059ccc457 New file. The interface is inspired
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263
2c9059ccc457 New file. The interface is inspired
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diff changeset
264 return p;
2c9059ccc457 New file. The interface is inspired
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diff changeset
265 }
1391
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266
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
267
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
268 /* The default block size used for output. This number may change in
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
269 the future as disks get larger. */
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
270 #ifndef DEFAULT_BLOCK_SIZE
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diff changeset
271 # define DEFAULT_BLOCK_SIZE 1024
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
272 #endif
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
273
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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diff changeset
274 static char const *const block_size_args[] = { "human-readable", "si", 0 };
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diff changeset
275 static int const block_size_types[] = { -1024, -1000 };
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diff changeset
276
2008
2d8ab27e705c (default_block_size): New function.
Jim Meyering <jim@meyering.net>
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diff changeset
277 static int
2d8ab27e705c (default_block_size): New function.
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diff changeset
278 default_block_size (void)
2d8ab27e705c (default_block_size): New function.
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diff changeset
279 {
2d8ab27e705c (default_block_size): New function.
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diff changeset
280 return getenv ("POSIXLY_CORRECT") ? 512 : DEFAULT_BLOCK_SIZE;
2d8ab27e705c (default_block_size): New function.
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diff changeset
281 }
2d8ab27e705c (default_block_size): New function.
Jim Meyering <jim@meyering.net>
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diff changeset
282
1391
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diff changeset
283 static strtol_error
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284 humblock (char const *spec, int *block_size)
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285 {
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286 int i;
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287
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288 if (! spec && ! (spec = getenv ("BLOCK_SIZE")))
2008
2d8ab27e705c (default_block_size): New function.
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289 *block_size = default_block_size ();
1596
ca73757a0183 (humblock): Use ARGMATCH in place of argmatch.
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parents: 1439
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290 else if (0 <= (i = ARGMATCH (spec, block_size_args, block_size_types)))
1391
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291 *block_size = block_size_types[i];
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292 else
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293 {
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294 char *ptr;
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295 unsigned long val;
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296 strtol_error e = xstrtoul (spec, &ptr, 0, &val, "eEgGkKmMpPtTyYzZ0");
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297 if (e != LONGINT_OK)
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298 return e;
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299 if (*ptr)
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300 return LONGINT_INVALID_SUFFIX_CHAR;
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301 if ((int) val < 0 || val != (int) val)
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302 return LONGINT_OVERFLOW;
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parents: 1142
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303 *block_size = (int) val;
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304 }
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305
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306 return LONGINT_OK;
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307 }
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308
c9a7b76bd443 * lib/human.c, lib/human.h (human_readable): Coalesce last two args
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309 void
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310 human_block_size (char const *spec, int report_errors, int *block_size)
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311 {
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312 strtol_error e = humblock (spec, block_size);
2008
2d8ab27e705c (default_block_size): New function.
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parents: 1863
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313 if (*block_size == 0)
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314 {
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315 *block_size = default_block_size ();
2d8ab27e705c (default_block_size): New function.
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316 e = LONGINT_INVALID;
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parents: 1863
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317 }
1391
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318 if (e != LONGINT_OK && report_errors)
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parents: 1142
diff changeset
319 STRTOL_FATAL_ERROR (spec, _("block size"), e);
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320 }