diff options
Diffstat (limited to 'libbb/human_readable.c')
| -rw-r--r-- | libbb/human_readable.c | 117 |
1 files changed, 70 insertions, 47 deletions
diff --git a/libbb/human_readable.c b/libbb/human_readable.c index 2cb8875..548712c 100644 --- a/libbb/human_readable.c +++ b/libbb/human_readable.c @@ -1,66 +1,89 @@ -/* vi: set sw=4 ts=4: */ /* - * make_human_readable_str + * June 30, 2001 Manuel Novoa III * - * Copyright (C) 1999-2001 Erik Andersen <andersee@debian.org> + * All-integer version (hey, not everyone has floating point) of + * make_human_readable_str, modified from similar code I had written + * for busybox several months ago. * - * 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 of the License, or - * (at your option) any later version. + * Notes: + * 1) I'm using an unsigned long long to hold the product size * block_size, + * as df (which calls this routine) could request a representation of a + * partition size in bytes > max of unsigned long. If long longs aren't + * available, it would be possible to do what's needed using polynomial + * representations (say, powers of 1024) and manipulating coefficients. + * The base ten "bytes" output could be handled similarly. * - * 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. + * 2) The output of "ls -sh" can be misaligned because this routine always + * outputs a decimal point and a tenths digit when display_unit != 0. + * Hence, it isn't uncommon for the returned string to have a length + * of 5 or 6 instead of <= 4 (as assumed). * - * 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 + * It might be nice to add a flag to indicate no decimal digits in + * that case. This could be either an additional parameter, or a + * special value of display_unit. Such a flag would also be nice for du. + * + * Some code to omit the decimal point and tenths digit is sketched out + * and "#if 0"'d below. */ #include <stdio.h> #include "libbb.h" - - const char *make_human_readable_str(unsigned long size, - unsigned long block_size, unsigned long display_unit) + unsigned long block_size, + unsigned long display_unit) { - static char str[10] = "\0"; - static const char strings[] = { 0, 'k', 'M', 'G', 'T', 0 }; + /* The code will adjust for additional (appended) units. */ + static const char zero_and_units[] = { '0', 0, 'k', 'M', 'G', 'T' }; + static const char fmt[] = "%Lu"; + static const char fmt_tenths[] = "%Lu.%d%c"; - if(size == 0 || block_size == 0) - return("0"); + static char str[21]; /* Sufficient for 64 bit unsigned integers. */ - if(display_unit) { - snprintf(str, 9, "%ld", (size/display_unit)*block_size); + unsigned long long val; + int frac; + const char *u; + const char *f; + + u = zero_and_units; + f = fmt; + frac = 0; + + val = ((unsigned long long) size) * block_size; + if (val == 0) { + return u; + } + + if (display_unit) { + val += display_unit/2; /* Deal with rounding. */ + val /= display_unit; /* Don't combine with the line above!!! */ } else { - /* Ok, looks like they want us to autoscale */ - int i=0; - unsigned long divisor = 1; - long double result = size*block_size; - for(i=0; i <= 4; i++) { - divisor<<=10; - if (result <= divisor) { - divisor>>=10; - break; + ++u; + while ((val >= KILOBYTE) + && (u < zero_and_units + sizeof(zero_and_units) - 1)) { + f = fmt_tenths; + ++u; + frac = ((((int)(val % KILOBYTE)) * 10) + (KILOBYTE/2)) / KILOBYTE; + val /= KILOBYTE; + } + if (frac >= 10) { /* We need to round up here. */ + ++val; + frac = 0; + } +#if 0 + /* Sample code to omit decimal point and tenths digit. */ + if ( /* no_tenths */ 1 ) { + if ( frac >= 5 ) { + ++val; } + f = "%Lu%*c" /* fmt_no_tenths */ ; + frac = 1; } - result/=divisor; - if (result > 10) - snprintf(str, 9, "%.0Lf%c", result, strings[i]); - else - snprintf(str, 9, "%.1Lf%c", result, strings[i]); +#endif } - return(str); -} -/* END CODE */ -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ + /* If f==fmt then 'frac' and 'u' are ignored. */ + snprintf(str, sizeof(str), f, val, frac, *u); + + return str; +} |