| 48 | static const int maxscale = 6; |
| 49 | |
| 50 | int |
| 51 | humanize_number(char *buf, size_t len, int64_t quotient, |
| 52 | const char *suffix, int scale, int flags) |
| 53 | { |
| 54 | const char *prefixes, *sep; |
| 55 | int i, r, remainder, s1, s2, sign; |
| 56 | int divisordeccut; |
| 57 | int64_t divisor, max; |
| 58 | size_t baselen; |
| 59 | |
| 60 | /* Since so many callers don't check -1, NUL terminate the buffer */ |
| 61 | if (len > 0) |
| 62 | buf[0] = '\0'; |
| 63 | |
| 64 | /* validate args */ |
| 65 | if (buf == NULL || suffix == NULL) |
| 66 | return (-1); |
| 67 | if (scale < 0) |
| 68 | return (-1); |
| 69 | else if (scale > maxscale && |
| 70 | ((scale & ~(HN_AUTOSCALE|HN_GETSCALE)) != 0)) |
| 71 | return (-1); |
| 72 | if ((flags & HN_DIVISOR_1000) && (flags & HN_IEC_PREFIXES)) |
| 73 | return (-1); |
| 74 | |
| 75 | /* setup parameters */ |
| 76 | remainder = 0; |
| 77 | |
| 78 | if (flags & HN_IEC_PREFIXES) { |
| 79 | baselen = 2; |
| 80 | /* |
| 81 | * Use the prefixes for power of two recommended by |
| 82 | * the International Electrotechnical Commission |
| 83 | * (IEC) in IEC 80000-3 (i.e. Ki, Mi, Gi...). |
| 84 | * |
| 85 | * HN_IEC_PREFIXES implies a divisor of 1024 here |
| 86 | * (use of HN_DIVISOR_1000 would have triggered |
| 87 | * an assertion earlier). |
| 88 | */ |
| 89 | divisor = 1024; |
| 90 | divisordeccut = 973; /* ceil(.95 * 1024) */ |
| 91 | if (flags & HN_B) |
| 92 | prefixes = "B\0\0Ki\0Mi\0Gi\0Ti\0Pi\0Ei"; |
| 93 | else |
| 94 | prefixes = "\0\0\0Ki\0Mi\0Gi\0Ti\0Pi\0Ei"; |
| 95 | } else { |
| 96 | baselen = 1; |
| 97 | if (flags & HN_DIVISOR_1000) { |
| 98 | divisor = 1000; |
| 99 | divisordeccut = 950; |
| 100 | if (flags & HN_B) |
| 101 | prefixes = "B\0\0k\0\0M\0\0G\0\0T\0\0P\0\0E"; |
| 102 | else |
| 103 | prefixes = "\0\0\0k\0\0M\0\0G\0\0T\0\0P\0\0E"; |
| 104 | } else { |
| 105 | divisor = 1024; |
| 106 | divisordeccut = 973; /* ceil(.95 * 1024) */ |
| 107 | if (flags & HN_B) |