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authorAnthony G. Basile <blueness@gentoo.org>2014-08-05 19:22:24 -0400
committerAnthony G. Basile <blueness@gentoo.org>2014-08-05 19:22:24 -0400
commitb1ac60946d1625e14029ea9b7fa3aa4c06e0795f (patch)
tree28cdd75fec8c6c6a2cf69c9668add048c10370f8 /src/shared/time-util.c
parent4b8733ffe9c0fe8e5a527186d323dab93e43fb37 (diff)
src/shared: refactor shared code
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Diffstat (limited to 'src/shared/time-util.c')
-rw-r--r--src/shared/time-util.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/src/shared/time-util.c b/src/shared/time-util.c
new file mode 100644
index 0000000000..6f76e8c19b
--- /dev/null
+++ b/src/shared/time-util.c
@@ -0,0 +1,157 @@
+/***
+ This file is part of eudev, forked from systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <time.h>
+
+#include "time-util.h"
+#include "macro.h"
+
+usec_t now(clockid_t clock_id) {
+ struct timespec ts;
+
+ assert_se(clock_gettime(clock_id, &ts) == 0);
+
+ return timespec_load(&ts);
+}
+
+usec_t timespec_load(const struct timespec *ts) {
+ assert(ts);
+
+ if (ts->tv_sec == (time_t) -1 &&
+ ts->tv_nsec == (long) -1)
+ return USEC_INFINITY;
+
+ if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC)
+ return USEC_INFINITY;
+
+ return
+ (usec_t) ts->tv_sec * USEC_PER_SEC +
+ (usec_t) ts->tv_nsec / NSEC_PER_USEC;
+}
+
+char *format_timespan(char *buf, size_t l, usec_t t, usec_t accuracy) {
+ static const struct {
+ const char *suffix;
+ usec_t usec;
+ } table[] = {
+ { "y", USEC_PER_YEAR },
+ { "month", USEC_PER_MONTH },
+ { "w", USEC_PER_WEEK },
+ { "d", USEC_PER_DAY },
+ { "h", USEC_PER_HOUR },
+ { "min", USEC_PER_MINUTE },
+ { "s", USEC_PER_SEC },
+ { "ms", USEC_PER_MSEC },
+ { "us", 1 },
+ };
+
+ unsigned i;
+ char *p = buf;
+ bool something = false;
+
+ assert(buf);
+ assert(l > 0);
+
+ if (t == USEC_INFINITY)
+ return NULL;
+
+ if (t <= 0) {
+ snprintf(p, l, "0");
+ p[l-1] = 0;
+ return p;
+ }
+
+ /* The result of this function can be parsed with parse_sec */
+
+ for (i = 0; i < ELEMENTSOF(table); i++) {
+ int k = 0;
+ size_t n;
+ bool done = false;
+ usec_t a, b;
+
+ if (t <= 0)
+ break;
+
+ if (t < accuracy && something)
+ break;
+
+ if (t < table[i].usec)
+ continue;
+
+ if (l <= 1)
+ break;
+
+ a = t / table[i].usec;
+ b = t % table[i].usec;
+
+ /* Let's see if we should shows this in dot notation */
+ if (t < USEC_PER_MINUTE && b > 0) {
+ usec_t cc;
+ int j;
+
+ j = 0;
+ for (cc = table[i].usec; cc > 1; cc /= 10)
+ j++;
+
+ for (cc = accuracy; cc > 1; cc /= 10) {
+ b /= 10;
+ j--;
+ }
+
+ if (j > 0) {
+ k = snprintf(p, l,
+ "%s"USEC_FMT".%0*llu%s",
+ p > buf ? " " : "",
+ a,
+ j,
+ (unsigned long long) b,
+ table[i].suffix);
+
+ t = 0;
+ done = true;
+ }
+ }
+
+ /* No? Then let's show it normally */
+ if (!done) {
+ k = snprintf(p, l,
+ "%s"USEC_FMT"%s",
+ p > buf ? " " : "",
+ a,
+ table[i].suffix);
+
+ t = b;
+ }
+
+ n = MIN((size_t) k, l);
+
+ l -= n;
+ p += n;
+
+ something = true;
+ }
+
+ *p = 0;
+
+ return buf;
+}
+