2 * Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 static unsigned long long xstrtoull(const char *p, char **end)
28 } else if ('1' <= *p && *p <= '9') {
29 unsigned long long val;
32 val = strtoull(p, end, 10);
39 static void proc_uptime(int fd, uint64_t *uptime, uint64_t *idle)
45 /* save "p < end" checks */
46 memset(buf, 0, sizeof(buf));
47 rv = pread(fd, buf, sizeof(buf), 0);
48 assert(0 <= rv && rv <= sizeof(buf));
49 buf[sizeof(buf) - 1] = '\0';
53 val1 = xstrtoull(p, &p);
55 assert('0' <= p[1] && p[1] <= '9');
56 assert('0' <= p[2] && p[2] <= '9');
59 val2 = (p[1] - '0') * 10 + p[2] - '0';
60 *uptime = val1 * 100 + val2;
64 val1 = xstrtoull(p, &p);
66 assert('0' <= p[1] && p[1] <= '9');
67 assert('0' <= p[2] && p[2] <= '9');
70 val2 = (p[1] - '0') * 10 + p[2] - '0';
71 *idle = val1 * 100 + val2;
73 assert(p + 4 == buf + rv);