1 /*
2 * Copyright (c) 2011 Alex Hornung <alex@alexhornung.com>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <string.h>
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <inttypes.h>
34 #include <ctype.h>
35 #include <errno.h>
36
37 #include "humanize.h"
38
39 static const char prefixes[] = " KMGTPE";
40 int
_humanize_number(char * buf,size_t bufsz,uint64_t num)41 _humanize_number(char *buf, size_t bufsz, uint64_t num)
42 {
43 const char *prefixp;
44 int ret;
45 uint64_t i, d;
46
47 prefixp = prefixes;
48 i = num;
49 d = 0;
50
51 while ((i > 1024) && (*prefixp != '\0')) {
52 d = (i % 1024)/10;
53 i /= 1024;
54 ++prefixp;
55 }
56
57 if (d > 0)
58 ret = snprintf(buf, bufsz, "%"PRIu64".%"PRIu64" %c",
59 i, d, *prefixp);
60 else
61 ret = snprintf(buf, bufsz, "%"PRIu64" %c", i, *prefixp);
62
63
64 if ((ret < 0) || ((size_t)ret >= bufsz)) {
65 errno = ENOMEM;
66 return -1;
67 } else {
68 return 0;
69 }
70 }
71
72 int
_dehumanize_number(const char * buf,uint64_t * dest)73 _dehumanize_number(const char *buf, uint64_t *dest)
74 {
75 char *endptr;
76 uint64_t n, n_check, d;
77 uint64_t multiplier;
78 size_t len;
79
80 if (*buf == '\0') {
81 errno = EINVAL;
82 return -1;
83 }
84
85 len = strlen(buf);
86 if (tolower(buf[len-1]) == 'b')
87 --len;
88
89 multiplier = 1;
90
91 switch (tolower(buf[len-1])) {
92 case 'y':
93 multiplier *= 1024;
94 /* FALLTHROUGH */
95 case 'z':
96 multiplier *= 1024;
97 /* FALLTHROUGH */
98 case 'e':
99 multiplier *= 1024;
100 /* FALLTHROUGH */
101 case 'p':
102 multiplier *= 1024;
103 /* FALLTHROUGH */
104 case 't':
105 multiplier *= 1024;
106 /* FALLTHROUGH */
107 case 'g':
108 multiplier *= 1024;
109 /* FALLTHROUGH */
110 case 'm':
111 multiplier *= 1024;
112 /* FALLTHROUGH */
113 case 'k':
114 multiplier *= 1024;
115 break;
116 default:
117 /*
118 * only set error if string ends in a character that
119 * is not a valid unit.
120 */
121 if (isalpha(buf[len-1])) {
122 errno = EINVAL;
123 return -1;
124 }
125 }
126
127 d = 0;
128 n = n_check = strtoull(buf, &endptr, 10);
129 if (endptr) {
130 if ((*endptr != '.') && (*endptr != '\0') &&
131 (*endptr != ' ') && (endptr != &buf[len-1])) {
132 errno = EINVAL;
133 return -1;
134 }
135
136 if (*endptr == '.') {
137 d = strtoull(endptr+1, &endptr, 10);
138 if (endptr && (*endptr != '\0') &&
139 (*endptr != ' ') &&
140 (endptr != &buf[len-1])) {
141 errno = EINVAL;
142 return -1;
143 }
144 }
145 }
146
147 if (d != 0) {
148 while (d < 100)
149 d *= 10;
150
151 while (d > 1000)
152 d /= 10;
153 }
154
155 d *= (multiplier/1024);
156 n *= multiplier;
157
158 if ((uint64_t)(n/multiplier) != n_check) {
159 errno = ERANGE;
160 return -1;
161 }
162
163 n += d;
164 *dest = n;
165
166 return 0;
167 }
168
169 #ifdef __TEST_HUMANIZE__
170
171 #include <assert.h>
main(int argc,char * argv[])172 int main(int argc, char *argv[])
173 {
174 char buf[1024];
175 uint64_t n, out;
176 int err;
177
178 if (argc < 3)
179 return -1;
180
181 n = strtoull(argv[1], NULL, 10);
182
183 err = _humanize_number(buf, 1024, n);
184 assert(err == 0);
185
186 err = _dehumanize_number(buf, &out);
187 assert(err == 0);
188
189 printf("Converting: %"PRIu64" => %s => %"PRIu64"\n", n, buf, out);
190
191 err = _dehumanize_number(argv[2], &out);
192 assert (err == 0);
193
194 printf("Converting: %s => %"PRIu64"\n", argv[2], out);
195
196 return 0;
197 }
198
199 #endif
200