[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * June 30, 2001 Manuel Novoa III
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| 4 | *
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| 5 | * All-integer version (hey, not everyone has floating point) of
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| 6 | * make_human_readable_str, modified from similar code I had written
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| 7 | * for busybox several months ago.
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| 8 | *
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| 9 | * Notes:
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| 10 | * 1) I'm using an unsigned long long to hold the product size * block_size,
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| 11 | * as df (which calls this routine) could request a representation of a
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| 12 | * partition size in bytes > max of unsigned long. If long longs aren't
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| 13 | * available, it would be possible to do what's needed using polynomial
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| 14 | * representations (say, powers of 1024) and manipulating coefficients.
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| 15 | * The base ten "bytes" output could be handled similarly.
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| 16 | *
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| 17 | * 2) This routine always outputs a decimal point and a tenths digit when
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| 18 | * display_unit != 0. Hence, it isn't uncommon for the returned string
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| 19 | * to have a length of 5 or 6.
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| 20 | *
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| 21 | * It might be nice to add a flag to indicate no decimal digits in
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| 22 | * that case. This could be either an additional parameter, or a
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| 23 | * special value of display_unit. Such a flag would also be nice for du.
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| 24 | *
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| 25 | * Some code to omit the decimal point and tenths digit is sketched out
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| 26 | * and "#if 0"'d below.
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| 27 | *
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| 28 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 29 | */
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| 30 |
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| 31 | #include "libbb.h"
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| 32 |
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| 33 | const char* FAST_FUNC make_human_readable_str(unsigned long long val,
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| 34 | unsigned long block_size, unsigned long display_unit)
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| 35 | {
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| 36 | static const char unit_chars[] ALIGN1 = {
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| 37 | '\0', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'
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| 38 | };
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| 39 |
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| 40 | static char *str;
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| 41 |
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| 42 | unsigned frac; /* 0..9 - the fractional digit */
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| 43 | const char *u;
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| 44 | const char *fmt;
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| 45 |
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| 46 | if (val == 0)
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| 47 | return "0";
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| 48 |
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| 49 | fmt = "%llu";
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| 50 | if (block_size > 1)
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| 51 | val *= block_size;
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| 52 | frac = 0;
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| 53 | u = unit_chars;
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| 54 |
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| 55 | if (display_unit) {
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| 56 | val += display_unit/2; /* Deal with rounding */
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| 57 | val /= display_unit; /* Don't combine with the line above! */
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| 58 | /* will just print it as ulonglong (below) */
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| 59 | } else {
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| 60 | while ((val >= 1024)
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| 61 | /* && (u < unit_chars + sizeof(unit_chars) - 1) - always true */
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| 62 | ) {
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| 63 | fmt = "%llu.%u%c";
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| 64 | u++;
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| 65 | frac = (((unsigned)val % 1024) * 10 + 1024/2) / 1024;
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| 66 | val /= 1024;
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| 67 | }
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| 68 | if (frac >= 10) { /* we need to round up here */
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| 69 | ++val;
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| 70 | frac = 0;
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| 71 | }
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| 72 | #if 1
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| 73 | /* If block_size is 0, dont print fractional part */
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| 74 | if (block_size == 0) {
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| 75 | if (frac >= 5) {
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| 76 | ++val;
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| 77 | }
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| 78 | fmt = "%llu%*c";
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| 79 | frac = 1;
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| 80 | }
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| 81 | #endif
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| 82 | }
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| 83 |
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| 84 | if (!str) {
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| 85 | /* sufficient for any width of val */
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| 86 | str = xmalloc(sizeof(val)*3 + 2 + 3);
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| 87 | }
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| 88 | sprintf(str, fmt, val, frac, *u);
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| 89 | return str;
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| 90 | }
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| 91 |
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| 92 |
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| 93 | /* vda's implementations of the similar idea */
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| 94 |
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| 95 | /* Convert unsigned long long value into compact 5-char representation.
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| 96 | * String is not terminated (buf[5] is untouched) */
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| 97 | void FAST_FUNC smart_ulltoa5(unsigned long long ul, char buf[5], const char *scale)
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| 98 | {
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| 99 | const char *fmt;
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| 100 | char c;
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| 101 | unsigned v, u, idx = 0;
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| 102 |
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| 103 | if (ul > 99999) { // do not scale if 99999 or less
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| 104 | ul *= 10;
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| 105 | do {
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| 106 | ul /= 1024;
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| 107 | idx++;
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| 108 | } while (ul >= 100000);
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| 109 | }
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| 110 | v = ul; // ullong divisions are expensive, avoid them
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| 111 |
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| 112 | fmt = " 123456789";
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| 113 | u = v / 10;
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| 114 | v = v % 10;
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| 115 | if (!idx) {
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| 116 | // 99999 or less: use "12345" format
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| 117 | // u is value/10, v is last digit
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| 118 | c = buf[0] = " 123456789"[u/1000];
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| 119 | if (c != ' ') fmt = "0123456789";
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| 120 | c = buf[1] = fmt[u/100%10];
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| 121 | if (c != ' ') fmt = "0123456789";
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| 122 | c = buf[2] = fmt[u/10%10];
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| 123 | if (c != ' ') fmt = "0123456789";
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| 124 | buf[3] = fmt[u%10];
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| 125 | buf[4] = "0123456789"[v];
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| 126 | } else {
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| 127 | // value has been scaled into 0..9999.9 range
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| 128 | // u is value, v is 1/10ths (allows for 92.1M format)
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| 129 | if (u >= 100) {
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| 130 | // value is >= 100: use "1234M', " 123M" formats
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| 131 | c = buf[0] = " 123456789"[u/1000];
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| 132 | if (c != ' ') fmt = "0123456789";
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| 133 | c = buf[1] = fmt[u/100%10];
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| 134 | if (c != ' ') fmt = "0123456789";
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| 135 | v = u % 10;
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| 136 | u = u / 10;
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| 137 | buf[2] = fmt[u%10];
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| 138 | } else {
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| 139 | // value is < 100: use "92.1M" format
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| 140 | c = buf[0] = " 123456789"[u/10];
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| 141 | if (c != ' ') fmt = "0123456789";
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| 142 | buf[1] = fmt[u%10];
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| 143 | buf[2] = '.';
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| 144 | }
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| 145 | buf[3] = "0123456789"[v];
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| 146 | buf[4] = scale[idx]; /* typically scale = " kmgt..." */
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | /* Convert unsigned long long value into compact 4-char
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| 151 | * representation. Examples: "1234", "1.2k", " 27M", "123T"
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| 152 | * String is not terminated (buf[4] is untouched) */
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| 153 | void FAST_FUNC smart_ulltoa4(unsigned long long ul, char buf[4], const char *scale)
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| 154 | {
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| 155 | const char *fmt;
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| 156 | char c;
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| 157 | unsigned v, u, idx = 0;
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| 158 |
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| 159 | if (ul > 9999) { // do not scale if 9999 or less
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| 160 | ul *= 10;
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| 161 | do {
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| 162 | ul /= 1024;
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| 163 | idx++;
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| 164 | } while (ul >= 10000);
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| 165 | }
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| 166 | v = ul; // ullong divisions are expensive, avoid them
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| 167 |
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| 168 | fmt = " 123456789";
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| 169 | u = v / 10;
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| 170 | v = v % 10;
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| 171 | if (!idx) {
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| 172 | // 9999 or less: use "1234" format
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| 173 | // u is value/10, v is last digit
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| 174 | c = buf[0] = " 123456789"[u/100];
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| 175 | if (c != ' ') fmt = "0123456789";
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| 176 | c = buf[1] = fmt[u/10%10];
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| 177 | if (c != ' ') fmt = "0123456789";
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| 178 | buf[2] = fmt[u%10];
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| 179 | buf[3] = "0123456789"[v];
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| 180 | } else {
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| 181 | // u is value, v is 1/10ths (allows for 9.2M format)
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| 182 | if (u >= 10) {
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| 183 | // value is >= 10: use "123M', " 12M" formats
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| 184 | c = buf[0] = " 123456789"[u/100];
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| 185 | if (c != ' ') fmt = "0123456789";
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| 186 | v = u % 10;
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| 187 | u = u / 10;
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| 188 | buf[1] = fmt[u%10];
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| 189 | } else {
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| 190 | // value is < 10: use "9.2M" format
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| 191 | buf[0] = "0123456789"[u];
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| 192 | buf[1] = '.';
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| 193 | }
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| 194 | buf[2] = "0123456789"[v];
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| 195 | buf[3] = scale[idx]; /* typically scale = " kmgt..." */
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| 196 | }
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| 197 | }
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