"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 2 | /* |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 3 | * June 30, 2001 Manuel Novoa III |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 4 | * |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 5 | * All-integer version (hey, not everyone has floating point) of |
| 6 | * make_human_readable_str, modified from similar code I had written |
| 7 | * for busybox several months ago. |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 8 | * |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 9 | * Notes: |
| 10 | * 1) I'm using an unsigned long long to hold the product size * block_size, |
| 11 | * as df (which calls this routine) could request a representation of a |
| 12 | * partition size in bytes > max of unsigned long. If long longs aren't |
| 13 | * available, it would be possible to do what's needed using polynomial |
| 14 | * representations (say, powers of 1024) and manipulating coefficients. |
| 15 | * The base ten "bytes" output could be handled similarly. |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 16 | * |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 17 | * 2) This routine always outputs a decimal point and a tenths digit when |
| 18 | * display_unit != 0. Hence, it isn't uncommon for the returned string |
Eric Andersen | 0159597 | 2001-06-30 18:08:36 +0000 | [diff] [blame] | 19 | * to have a length of 5 or 6. |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 20 | * |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 21 | * It might be nice to add a flag to indicate no decimal digits in |
| 22 | * that case. This could be either an additional parameter, or a |
| 23 | * special value of display_unit. Such a flag would also be nice for du. |
| 24 | * |
| 25 | * Some code to omit the decimal point and tenths digit is sketched out |
| 26 | * and "#if 0"'d below. |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 27 | */ |
| 28 | |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 29 | #include "libbb.h" |
| 30 | |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 31 | const char *make_human_readable_str(unsigned long long size, |
Eric Andersen | 97e2426 | 2003-08-22 23:08:37 +0000 | [diff] [blame] | 32 | unsigned long block_size, unsigned long display_unit) |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 33 | { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame^] | 34 | /* The code will adjust for additional (appended) units */ |
| 35 | static const char zero_and_units[] ALIGN1 = { '0', 0, 'k', 'M', 'G', 'T' }; |
| 36 | static const char fmt[] ALIGN1 = "%llu"; |
| 37 | static const char fmt_tenths[] ALIGN1 = "%llu.%d%c"; |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 38 | |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame^] | 39 | static char str[21] ALIGN1; /* Sufficient for 64 bit unsigned integers */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 40 | |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 41 | unsigned long long val; |
| 42 | int frac; |
| 43 | const char *u; |
| 44 | const char *f; |
Eric Andersen | 91c9388 | 2001-04-03 23:14:29 +0000 | [diff] [blame] | 45 | |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 46 | u = zero_and_units; |
| 47 | f = fmt; |
| 48 | frac = 0; |
| 49 | |
Eric Andersen | 97e2426 | 2003-08-22 23:08:37 +0000 | [diff] [blame] | 50 | val = size * block_size; |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 51 | if (val == 0) { |
| 52 | return u; |
| 53 | } |
| 54 | |
| 55 | if (display_unit) { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame^] | 56 | val += display_unit/2; /* Deal with rounding */ |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 57 | val /= display_unit; /* Don't combine with the line above!!! */ |
| 58 | } else { |
| 59 | ++u; |
Denis Vlasenko | dca0b70 | 2006-10-27 09:05:02 +0000 | [diff] [blame] | 60 | while ((val >= 1024) |
| 61 | && (u < zero_and_units + sizeof(zero_and_units) - 1) |
| 62 | ) { |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 63 | f = fmt_tenths; |
| 64 | ++u; |
Denis Vlasenko | dca0b70 | 2006-10-27 09:05:02 +0000 | [diff] [blame] | 65 | frac = (((int)(val % 1024)) * 10 + 1024/2) / 1024; |
| 66 | val /= 1024; |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 67 | } |
| 68 | if (frac >= 10) { /* We need to round up here. */ |
| 69 | ++val; |
| 70 | frac = 0; |
| 71 | } |
| 72 | #if 0 |
| 73 | /* Sample code to omit decimal point and tenths digit. */ |
Denis Vlasenko | 219d14d | 2007-03-24 15:40:16 +0000 | [diff] [blame] | 74 | if (/* no_tenths */ 1) { |
| 75 | if (frac >= 5) { |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 76 | ++val; |
| 77 | } |
Denis Vlasenko | b71c668 | 2007-07-21 15:08:09 +0000 | [diff] [blame] | 78 | f = "%llu%*c" /* fmt_no_tenths */; |
Manuel Novoa III | d877d44 | 2001-06-30 07:40:44 +0000 | [diff] [blame] | 79 | frac = 1; |
| 80 | } |
| 81 | #endif |
| 82 | } |
| 83 | |
| 84 | /* If f==fmt then 'frac' and 'u' are ignored. */ |
| 85 | snprintf(str, sizeof(str), f, val, frac, *u); |
| 86 | |
| 87 | return str; |
| 88 | } |