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 if (!*str) 39 return (B_FALSE); 40 41 for (; *str; str++) 42 if (!(isdigit(*str) || (*str == '.'))) 43 return (B_FALSE); 44 45 return (B_TRUE); 46 } 47 48 /* 49 * Convert a number to an appropriately human-readable output. 50 */ 51 void 52 zfs_nicenum_format(uint64_t num, char *buf, size_t buflen, 53 enum zfs_nicenum_format format) 54 { 55 uint64_t n = num; 56 int index = 0; 57 const char *u; 58 const char *units[3][7] = { 59 [ZFS_NICENUM_1024] = {"", "K", "M", "G", "T", "P", "E"}, 60 [ZFS_NICENUM_BYTES] = {"B", "K", "M", "G", "T", "P", "E"}, 61 [ZFS_NICENUM_TIME] = {"ns", "us", "ms", "s", "?", "?", "?"} 62 }; 63 64 const int units_len[] = {[ZFS_NICENUM_1024] = 6, 65 [ZFS_NICENUM_BYTES] = 6, 66 [ZFS_NICENUM_TIME] = 4}; 67 68 const int k_unit[] = { [ZFS_NICENUM_1024] = 1024, 69 [ZFS_NICENUM_BYTES] = 1024, 70 [ZFS_NICENUM_TIME] = 1000}; 71 72 double val; 73 74 if (format == ZFS_NICENUM_RAW) { 75 snprintf(buf, buflen, "%llu", (u_longlong_t)num); 76 return; 77 } else if (format == ZFS_NICENUM_RAWTIME && num > 0) { 78 snprintf(buf, buflen, "%llu", (u_longlong_t)num); 79 return; 80 } else if (format == ZFS_NICENUM_RAWTIME && num == 0) { 81 snprintf(buf, buflen, "%s", "-"); 82 return; 83 } 84 85 while (n >= k_unit[format] && index < units_len[format]) { 86 n /= k_unit[format]; 87 index++; 88 } 89 90 u = units[format][index]; 91 92 /* Don't print zero latencies since they're invalid */ 93 if ((format == ZFS_NICENUM_TIME) && (num == 0)) { 94 (void) snprintf(buf, buflen, "-"); 95 } else if ((index == 0) || ((num % 96 (uint64_t)powl(k_unit[format], index)) == 0)) { 97 /* 98 * If this is an even multiple of the base, always display 99 * without any decimal precision. 100 */ 101 (void) snprintf(buf, buflen, "%llu%s", (u_longlong_t)n, u); 102 103 } else { 104 /* 105 * We want to choose a precision that reflects the best choice 106 * for fitting in 5 characters. This can get rather tricky when 107 * we have numbers that are very close to an order of magnitude. 108 * For example, when displaying 10239 (which is really 9.999K), 109 * we want only a single place of precision for 10.0K. We could 110 * develop some complex heuristics for this, but it's much 111 * easier just to try each combination in turn. 112 */ 113 int i; 114 for (i = 2; i >= 0; i--) { 115 val = (double)num / 116 (uint64_t)powl(k_unit[format], index); 117 118 /* 119 * Don't print floating point values for time. Note, 120 * we use floor() instead of round() here, since 121 * round can result in undesirable results. For 122 * example, if "num" is in the range of 123 * 999500-999999, it will print out "1000us". This 124 * doesn't happen if we use floor(). 125 */ 126 if (format == ZFS_NICENUM_TIME) { 127 if (snprintf(buf, buflen, "%d%s", 128 (unsigned int) floor(val), u) <= 5) 129 break; 130 131 } else { 132 if (snprintf(buf, buflen, "%.*f%s", i, 133 val, u) <= 5) 134 break; 135 } 136 } 137 } 138 } 139 140 /* 141 * Convert a number to an appropriately human-readable output. 142 */ 143 void 144 zfs_nicenum(uint64_t num, char *buf, size_t buflen) 145 { 146 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_1024); 147 } 148 149 /* 150 * Convert a time to an appropriately human-readable output. 151 * @num: Time in nanoseconds 152 */ 153 void 154 zfs_nicetime(uint64_t num, char *buf, size_t buflen) 155 { 156 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_TIME); 157 } 158 159 /* 160 * Print out a raw number with correct column spacing 161 */ 162 void 163 zfs_niceraw(uint64_t num, char *buf, size_t buflen) 164 { 165 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_RAW); 166 } 167 168 /* 169 * Convert a number of bytes to an appropriately human-readable output. 170 */ 171 void 172 zfs_nicebytes(uint64_t num, char *buf, size_t buflen) 173 { 174 zfs_nicenum_format(num, buf, buflen, ZFS_NICENUM_BYTES); 175 } 176