1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 #include <ctype.h> 27 #include <math.h> 28 #include <stdio.h> 29 #include <libzutil.h> 30 31 /* 32 * Return B_TRUE if "str" is a number string, B_FALSE otherwise. 33 * Works for integer and floating point numbers. 34 */ 35 boolean_t 36 zfs_isnumber(const char *str) 37 { 38 for (; *str; str++) 39 if (!(isdigit(*str) || (*str == '.'))) 40 return (B_FALSE); 41 42 return (B_TRUE); 43 } 44 45 /* 46 * Convert a number to an appropriately human-readable output. 47 */ 48 void 49 zfs_nicenum_format(uint64_t num, char *buf, size_t buflen, 50 enum zfs_nicenum_format format) 51 { 52 uint64_t n = num; 53 int index = 0; 54 const char *u; 55 const char *units[3][7] = { 56 [ZFS_NICENUM_1024] = {"", "K", "M", "G", "T", "P", "E"}, 57 [ZFS_NICENUM_BYTES] = {"B", "K", "M", "G", "T", "P", "E"}, 58 [ZFS_NICENUM_TIME] = {"ns", "us", "ms", "s", "?", "?", "?"} 59 }; 60 61 const int units_len[] = {[ZFS_NICENUM_1024] = 6, 62 [ZFS_NICENUM_BYTES] = 6, 63 [ZFS_NICENUM_TIME] = 4}; 64 65 const int k_unit[] = { [ZFS_NICENUM_1024] = 1024, 66 [ZFS_NICENUM_BYTES] = 1024, 67 [ZFS_NICENUM_TIME] = 1000}; 68 69 double val; 70 71 if (format == ZFS_NICENUM_RAW) { 72 (void) snprintf(buf, buflen, "%llu", (u_longlong_t)num); 73 return; 74 } else if (format == ZFS_NICENUM_RAWTIME && num > 0) { 75 (void) snprintf(buf, buflen, "%llu", (u_longlong_t)num); 76 return; 77 } else if (format == ZFS_NICENUM_RAWTIME && num == 0) { 78 (void) snprintf(buf, buflen, "%s", "-"); 79 return; 80 } 81 82 while (n >= k_unit[format] && index < units_len[format]) { 83 n /= k_unit[format]; 84 index++; 85 } 86 87 u = units[format][index]; 88 89 /* Don't print zero latencies since they're invalid */ 90 if ((format == ZFS_NICENUM_TIME) && (num == 0)) { 91 (void) snprintf(buf, buflen, "-"); 92 } else if ((index == 0) || ((num % 93 (uint64_t)powl(k_unit[format], index)) == 0)) { 94 /* 95 * If this is an even multiple of the base, always display 96 * without any decimal precision. 97 */ 98 (void) snprintf(buf, buflen, "%llu%s", (u_longlong_t)n, u); 99 100 } else { 101 /* 102 * We want to choose a precision that reflects the best choice 103 * for fitting in 5 characters. This can get rather tricky when 104 * we have numbers that are very close to an order of magnitude. 105 * For example, when displaying 10239 (which is really 9.999K), 106 * we want only a single place of precision for 10.0K. We could 107 * develop some complex heuristics for this, but it's much 108 * easier just to try each combination in turn. 109 */ 110 int i; 111 for (i = 2; i >= 0; i--) { 112 val = (double)num / 113 (uint64_t)powl(k_unit[format], index); 114 115 /* 116 * Don't print floating point values for time. Note, 117 * we use floor() instead of round() here, since 118 * round can result in undesirable results. For 119 * example, if "num" is in the range of 120 * 999500-999999, it will print out "1000us". This 121 * doesn't happen if we use floor(). 122 */ 123 if (format == ZFS_NICENUM_TIME) { 124 if (snprintf(buf, buflen, "%d%s", 125 (unsigned int) floor(val), u) <= 5) 126 break; 127 128 } else { 129 if (snprintf(buf, buflen, "%.*f%s", i, 130 val, u) <= 5) 131 break; 132 } 133 } 134 } 135 } 136 137 /* 138 * Convert a number to an appropriately human-readable output. 139 */ 140 void 141 zfs_nicenum(uint64_t num, char *buf, size_t buflen) 142 { 143 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_1024); 144 } 145 146 /* 147 * Convert a time to an appropriately human-readable output. 148 * @num: Time in nanoseconds 149 */ 150 void 151 zfs_nicetime(uint64_t num, char *buf, size_t buflen) 152 { 153 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_TIME); 154 } 155 156 /* 157 * Print out a raw number with correct column spacing 158 */ 159 void 160 zfs_niceraw(uint64_t num, char *buf, size_t buflen) 161 { 162 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_RAW); 163 } 164 165 /* 166 * Convert a number of bytes to an appropriately human-readable output. 167 */ 168 void 169 zfs_nicebytes(uint64_t num, char *buf, size_t buflen) 170 { 171 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_BYTES); 172 } 173