| /* vi: set sw=4 ts=4: */ |
| /* |
| * June 30, 2001 Manuel Novoa III |
| * |
| * 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. |
| * |
| * 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. |
| * |
| * 2) This routine 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. |
| * |
| * If block_size is also 0, no decimal digits are printed. |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| |
| #include "libbb.h" |
| |
| const char* FAST_FUNC make_human_readable_str(unsigned long long val, |
| unsigned long block_size, unsigned long display_unit) |
| { |
| static const char unit_chars[] ALIGN1 = { |
| '\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y' |
| }; |
| |
| unsigned frac; /* 0..9 - the fractional digit */ |
| const char *u; |
| const char *fmt; |
| |
| if (val == 0) |
| return "0"; |
| |
| fmt = "%llu"; |
| if (block_size > 1) |
| val *= block_size; |
| frac = 0; |
| u = unit_chars; |
| |
| if (display_unit) { |
| val += display_unit/2; /* Deal with rounding */ |
| val /= display_unit; /* Don't combine with the line above! */ |
| /* will just print it as ulonglong (below) */ |
| } else { |
| while ((val >= 1024) |
| /* && (u < unit_chars + sizeof(unit_chars) - 1) - always true */ |
| ) { |
| fmt = "%llu.%u%c"; |
| u++; |
| frac = (((unsigned)val % 1024) * 10 + 1024/2) / 1024; |
| val /= 1024; |
| } |
| if (frac >= 10) { /* we need to round up here */ |
| ++val; |
| frac = 0; |
| } |
| #if 1 |
| /* If block_size is 0, dont print fractional part */ |
| if (block_size == 0) { |
| if (frac >= 5) { |
| ++val; |
| } |
| fmt = "%llu%*c"; |
| frac = 1; |
| } |
| #endif |
| } |
| |
| return auto_string(xasprintf(fmt, val, frac, *u)); |
| } |
| |
| |
| /* vda's implementations of the similar idea */ |
| |
| /* Convert unsigned long long value into compact 5-char representation. |
| * String is not terminated (buf[5] is untouched) */ |
| char* FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale) |
| { |
| const char *fmt; |
| char c; |
| unsigned v, u, idx = 0; |
| |
| if (ul > 99999) { // do not scale if 99999 or less |
| ul *= 10; |
| do { |
| ul /= 1024; |
| idx++; |
| } while (ul >= 100000); |
| } |
| v = ul; // ullong divisions are expensive, avoid them |
| |
| fmt = " 123456789"; |
| u = v / 10; |
| v = v % 10; |
| if (!idx) { |
| // 99999 or less: use "12345" format |
| // u is value/10, v is last digit |
| c = buf[0] = " 123456789"[u/1000]; |
| if (c != ' ') fmt = "0123456789"; |
| c = buf[1] = fmt[u/100%10]; |
| if (c != ' ') fmt = "0123456789"; |
| c = buf[2] = fmt[u/10%10]; |
| if (c != ' ') fmt = "0123456789"; |
| buf[3] = fmt[u%10]; |
| buf[4] = "0123456789"[v]; |
| } else { |
| // value has been scaled into 0..9999.9 range |
| // u is value, v is 1/10ths (allows for 92.1M format) |
| if (u >= 100) { |
| // value is >= 100: use "1234M', " 123M" formats |
| c = buf[0] = " 123456789"[u/1000]; |
| if (c != ' ') fmt = "0123456789"; |
| c = buf[1] = fmt[u/100%10]; |
| if (c != ' ') fmt = "0123456789"; |
| v = u % 10; |
| u = u / 10; |
| buf[2] = fmt[u%10]; |
| } else { |
| // value is < 100: use "92.1M" format |
| c = buf[0] = " 123456789"[u/10]; |
| if (c != ' ') fmt = "0123456789"; |
| buf[1] = fmt[u%10]; |
| buf[2] = '.'; |
| } |
| buf[3] = "0123456789"[v]; |
| buf[4] = scale[idx]; /* typically scale = " kmgt..." */ |
| } |
| return buf + 5; |
| } |
| |
| /* Convert unsigned long long value into compact 4-char |
| * representation. Examples: "1234", "1.2k", " 27M", "123T" |
| * String is not terminated (buf[4] is untouched) */ |
| char* FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale) |
| { |
| const char *fmt; |
| char c; |
| unsigned v, u, idx = 0; |
| |
| if (ul > 9999) { // do not scale if 9999 or less |
| ul *= 10; |
| do { |
| ul /= 1024; |
| idx++; |
| } while (ul >= 10000); |
| } |
| v = ul; // ullong divisions are expensive, avoid them |
| |
| fmt = " 123456789"; |
| u = v / 10; |
| v = v % 10; |
| if (!idx) { |
| // 9999 or less: use "1234" format |
| // u is value/10, v is last digit |
| c = buf[0] = " 123456789"[u/100]; |
| if (c != ' ') fmt = "0123456789"; |
| c = buf[1] = fmt[u/10%10]; |
| if (c != ' ') fmt = "0123456789"; |
| buf[2] = fmt[u%10]; |
| buf[3] = "0123456789"[v]; |
| } else { |
| // u is value, v is 1/10ths (allows for 9.2M format) |
| if (u >= 10) { |
| // value is >= 10: use "123M', " 12M" formats |
| c = buf[0] = " 123456789"[u/100]; |
| if (c != ' ') fmt = "0123456789"; |
| v = u % 10; |
| u = u / 10; |
| buf[1] = fmt[u%10]; |
| } else { |
| // value is < 10: use "9.2M" format |
| buf[0] = "0123456789"[u]; |
| buf[1] = '.'; |
| } |
| buf[2] = "0123456789"[v]; |
| buf[3] = scale[idx]; /* typically scale = " kmgt..." */ |
| } |
| return buf + 4; |
| } |