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-rw-r--r--src/basic/calendarspec.c43
-rw-r--r--src/basic/calendarspec.h1
-rw-r--r--src/basic/time-util.c146
-rw-r--r--src/basic/time-util.h4
-rw-r--r--src/test/test-calendarspec.c23
-rw-r--r--src/test/test-time.c44
6 files changed, 235 insertions, 26 deletions
diff --git a/src/basic/calendarspec.c b/src/basic/calendarspec.c
index e4cfab364e..fda293fcb9 100644
--- a/src/basic/calendarspec.c
+++ b/src/basic/calendarspec.c
@@ -302,6 +302,17 @@ int calendar_spec_to_string(const CalendarSpec *c, char **p) {
if (c->utc)
fputs(" UTC", f);
+ else if (IN_SET(c->dst, 0, 1)) {
+
+ /* If daylight saving is explicitly on or off, let's show the used timezone. */
+
+ tzset();
+
+ if (!isempty(tzname[c->dst])) {
+ fputc(' ', f);
+ fputs(tzname[c->dst], f);
+ }
+ }
r = fflush_and_check(f);
if (r < 0) {
@@ -747,9 +758,9 @@ fail:
}
int calendar_spec_from_string(const char *p, CalendarSpec **spec) {
+ const char *utc;
CalendarSpec *c;
int r;
- const char *utc;
assert(p);
assert(spec);
@@ -760,11 +771,39 @@ int calendar_spec_from_string(const char *p, CalendarSpec **spec) {
c = new0(CalendarSpec, 1);
if (!c)
return -ENOMEM;
+ c->dst = -1;
utc = endswith_no_case(p, " UTC");
if (utc) {
c->utc = true;
p = strndupa(p, utc - p);
+ } else {
+ const char *e = NULL;
+ int j;
+
+ tzset();
+
+ /* Check if the local timezone was specified? */
+ for (j = 0; j <= 1; j++) {
+ if (isempty(tzname[j]))
+ continue;
+
+ e = endswith_no_case(p, tzname[j]);
+ if(!e)
+ continue;
+ if (e == p)
+ continue;
+ if (e[-1] != ' ')
+ continue;
+
+ break;
+ }
+
+ /* Found one of the two timezones specified? */
+ if (IN_SET(j, 0, 1)) {
+ p = strndupa(p, e - p - 1);
+ c->dst = j;
+ }
}
if (strcaseeq(p, "minutely")) {
@@ -1017,7 +1056,7 @@ static int find_next(const CalendarSpec *spec, struct tm *tm, usec_t *usec) {
for (;;) {
/* Normalize the current date */
(void) mktime_or_timegm(&c, spec->utc);
- c.tm_isdst = -1;
+ c.tm_isdst = spec->dst;
c.tm_year += 1900;
r = find_matching_component(spec->year, &c.tm_year);
diff --git a/src/basic/calendarspec.h b/src/basic/calendarspec.h
index f6472c1244..c6087228fd 100644
--- a/src/basic/calendarspec.h
+++ b/src/basic/calendarspec.h
@@ -37,6 +37,7 @@ typedef struct CalendarComponent {
typedef struct CalendarSpec {
int weekdays_bits;
bool utc;
+ int dst;
CalendarComponent *year;
CalendarComponent *month;
diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 24e681bf85..0ef1f6393e 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -254,32 +254,95 @@ struct timeval *timeval_store(struct timeval *tv, usec_t u) {
return tv;
}
-static char *format_timestamp_internal(char *buf, size_t l, usec_t t,
- bool utc, bool us) {
+static char *format_timestamp_internal(
+ char *buf,
+ size_t l,
+ usec_t t,
+ bool utc,
+ bool us) {
+
+ /* The weekdays in non-localized (English) form. We use this instead of the localized form, so that our
+ * generated timestamps may be parsed with parse_timestamp(), and always read the same. */
+ static const char * const weekdays[] = {
+ [0] = "Sun",
+ [1] = "Mon",
+ [2] = "Tue",
+ [3] = "Wed",
+ [4] = "Thu",
+ [5] = "Fri",
+ [6] = "Sat",
+ };
+
struct tm tm;
time_t sec;
- int k;
+ size_t n;
assert(buf);
- assert(l > 0);
+ if (l <
+ 3 + /* week day */
+ 1 + 10 + /* space and date */
+ 1 + 8 + /* space and time */
+ (us ? 1 + 6 : 0) + /* "." and microsecond part */
+ 1 + 1 + /* space and shortest possible zone */
+ 1)
+ return NULL; /* Not enough space even for the shortest form. */
if (t <= 0 || t == USEC_INFINITY)
+ return NULL; /* Timestamp is unset */
+
+ sec = (time_t) (t / USEC_PER_SEC); /* Round down */
+ if ((usec_t) sec != (t / USEC_PER_SEC))
+ return NULL; /* overflow? */
+
+ if (!localtime_or_gmtime_r(&sec, &tm, utc))
return NULL;
- sec = (time_t) (t / USEC_PER_SEC);
- localtime_or_gmtime_r(&sec, &tm, utc);
+ /* Start with the week day */
+ assert((size_t) tm.tm_wday < ELEMENTSOF(weekdays));
+ memcpy(buf, weekdays[tm.tm_wday], 4);
- if (us)
- k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S", &tm);
- else
- k = strftime(buf, l, "%a %Y-%m-%d %H:%M:%S %Z", &tm);
+ /* Add the main components */
+ if (strftime(buf + 3, l - 3, " %Y-%m-%d %H:%M:%S", &tm) <= 0)
+ return NULL; /* Doesn't fit */
- if (k <= 0)
- return NULL;
+ /* Append the microseconds part, if that's requested */
if (us) {
- snprintf(buf + strlen(buf), l - strlen(buf), ".%06llu", (unsigned long long) (t % USEC_PER_SEC));
- if (strftime(buf + strlen(buf), l - strlen(buf), " %Z", &tm) <= 0)
- return NULL;
+ n = strlen(buf);
+ if (n + 8 > l)
+ return NULL; /* Microseconds part doesn't fit. */
+
+ sprintf(buf + n, ".%06llu", (unsigned long long) (t % USEC_PER_SEC));
+ }
+
+ /* Append the timezone */
+ n = strlen(buf);
+ if (utc) {
+ /* If this is UTC then let's explicitly use the "UTC" string here, because gmtime_r() normally uses the
+ * obsolete "GMT" instead. */
+ if (n + 5 > l)
+ return NULL; /* "UTC" doesn't fit. */
+
+ strcpy(buf + n, " UTC");
+
+ } else if (!isempty(tm.tm_zone)) {
+ size_t tn;
+
+ /* An explicit timezone is specified, let's use it, if it fits */
+ tn = strlen(tm.tm_zone);
+ if (n + 1 + tn + 1 > l) {
+ /* The full time zone does not fit in. Yuck. */
+
+ if (n + 1 + _POSIX_TZNAME_MAX + 1 > l)
+ return NULL; /* Not even enough space for the POSIX minimum (of 6)? In that case, complain that it doesn't fit */
+
+ /* So the time zone doesn't fit in fully, but the caller passed enough space for the POSIX
+ * minimum time zone length. In this case suppress the timezone entirely, in order not to dump
+ * an overly long, hard to read string on the user. This should be safe, because the user will
+ * assume the local timezone anyway if none is shown. And so does parse_timestamp(). */
+ } else {
+ buf[n++] = ' ';
+ strcpy(buf + n, tm.tm_zone);
+ }
}
return buf;
@@ -539,12 +602,11 @@ int parse_timestamp(const char *t, usec_t *usec) {
{ "Sat", 6 },
};
- const char *k;
- const char *utc;
+ const char *k, *utc, *tzn = NULL;
struct tm tm, copy;
time_t x;
usec_t x_usec, plus = 0, minus = 0, ret;
- int r, weekday = -1;
+ int r, weekday = -1, dst = -1;
unsigned i;
/*
@@ -609,15 +671,55 @@ int parse_timestamp(const char *t, usec_t *usec) {
goto finish;
}
+ /* See if the timestamp is suffixed with UTC */
utc = endswith_no_case(t, " UTC");
if (utc)
t = strndupa(t, utc - t);
+ else {
+ const char *e = NULL;
+ int j;
+
+ tzset();
+
+ /* See if the timestamp is suffixed by either the DST or non-DST local timezone. Note that we only
+ * support the local timezones here, nothing else. Not because we wouldn't want to, but simply because
+ * there are no nice APIs available to cover this. By accepting the local time zone strings, we make
+ * sure that all timestamps written by format_timestamp() can be parsed correctly, even though we don't
+ * support arbitrary timezone specifications. */
+
+ for (j = 0; j <= 1; j++) {
+
+ if (isempty(tzname[j]))
+ continue;
+
+ e = endswith_no_case(t, tzname[j]);
+ if (!e)
+ continue;
+ if (e == t)
+ continue;
+ if (e[-1] != ' ')
+ continue;
+
+ break;
+ }
- x = ret / USEC_PER_SEC;
+ if (IN_SET(j, 0, 1)) {
+ /* Found one of the two timezones specified. */
+ t = strndupa(t, e - t - 1);
+ dst = j;
+ tzn = tzname[j];
+ }
+ }
+
+ x = (time_t) (ret / USEC_PER_SEC);
x_usec = 0;
- assert_se(localtime_or_gmtime_r(&x, &tm, utc));
- tm.tm_isdst = -1;
+ if (!localtime_or_gmtime_r(&x, &tm, utc))
+ return -EINVAL;
+
+ tm.tm_isdst = dst;
+ if (tzn)
+ tm.tm_zone = tzn;
if (streq(t, "today")) {
tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
@@ -634,7 +736,6 @@ int parse_timestamp(const char *t, usec_t *usec) {
goto from_tm;
}
-
for (i = 0; i < ELEMENTSOF(day_nr); i++) {
size_t skip;
@@ -727,7 +828,6 @@ parse_usec:
return -EINVAL;
x_usec = add;
-
}
from_tm:
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 1b058f0e49..99be5ce6ee 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -68,7 +68,9 @@ typedef struct triple_timestamp {
#define USEC_PER_YEAR ((usec_t) (31557600ULL*USEC_PER_SEC))
#define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
-#define FORMAT_TIMESTAMP_MAX ((4*4+1)+11+9+4+1) /* weekdays can be unicode */
+/* We assume a maximum timezone length of 6. TZNAME_MAX is not defined on Linux, but glibc internally initializes this
+ * to 6. Let's rely on that. */
+#define FORMAT_TIMESTAMP_MAX (3+1+10+1+8+1+6+1+6+1)
#define FORMAT_TIMESTAMP_WIDTH 28 /* when outputting, assume this width */
#define FORMAT_TIMESTAMP_RELATIVE_MAX 256
#define FORMAT_TIMESPAN_MAX 64
diff --git a/src/test/test-calendarspec.c b/src/test/test-calendarspec.c
index 4a2b93de59..57d9da4855 100644
--- a/src/test/test-calendarspec.c
+++ b/src/test/test-calendarspec.c
@@ -88,6 +88,27 @@ static void test_next(const char *input, const char *new_tz, usec_t after, usec_
tzset();
}
+static void test_timestamp(void) {
+ char buf[FORMAT_TIMESTAMP_MAX];
+ _cleanup_free_ char *t = NULL;
+ CalendarSpec *c;
+ usec_t x, y;
+
+ /* Ensure that a timestamp is also a valid calendar specification. Convert forth and back */
+
+ x = now(CLOCK_REALTIME);
+
+ assert_se(format_timestamp_us(buf, sizeof(buf), x));
+ printf("%s\n", buf);
+ assert_se(calendar_spec_from_string(buf, &c) >= 0);
+ assert_se(calendar_spec_to_string(c, &t) >= 0);
+ calendar_spec_free(c);
+ printf("%s\n", t);
+
+ assert_se(parse_timestamp(t, &y) >= 0);
+ assert_se(y == x);
+}
+
int main(int argc, char* argv[]) {
CalendarSpec *c;
@@ -155,5 +176,7 @@ int main(int argc, char* argv[]) {
assert_se(calendar_spec_from_string("00:00:00/0.00000001", &c) < 0);
assert_se(calendar_spec_from_string("00:00:00.0..00.9", &c) < 0);
+ test_timestamp();
+
return 0;
}
diff --git a/src/test/test-time.c b/src/test/test-time.c
index ee7d55c5ab..7078a0374d 100644
--- a/src/test/test-time.c
+++ b/src/test/test-time.c
@@ -19,6 +19,7 @@
#include "strv.h"
#include "time-util.h"
+#include "random-util.h"
static void test_parse_sec(void) {
usec_t u;
@@ -201,6 +202,48 @@ static void test_usec_sub(void) {
assert_se(usec_sub(USEC_INFINITY, 5) == USEC_INFINITY);
}
+static void test_format_timestamp(void) {
+ unsigned i;
+
+ for (i = 0; i < 100; i++) {
+ char buf[MAX(FORMAT_TIMESTAMP_MAX, FORMAT_TIMESPAN_MAX)];
+ usec_t x, y;
+
+ random_bytes(&x, sizeof(x));
+ x = x % (2147483600 * USEC_PER_SEC) + 1;
+
+ assert_se(format_timestamp(buf, sizeof(buf), x));
+ log_info("%s", buf);
+ assert_se(parse_timestamp(buf, &y) >= 0);
+ assert_se(x / USEC_PER_SEC == y / USEC_PER_SEC);
+
+ assert_se(format_timestamp_utc(buf, sizeof(buf), x));
+ log_info("%s", buf);
+ assert_se(parse_timestamp(buf, &y) >= 0);
+ assert_se(x / USEC_PER_SEC == y / USEC_PER_SEC);
+
+ assert_se(format_timestamp_us(buf, sizeof(buf), x));
+ log_info("%s", buf);
+ assert_se(parse_timestamp(buf, &y) >= 0);
+ assert_se(x == y);
+
+ assert_se(format_timestamp_us_utc(buf, sizeof(buf), x));
+ log_info("%s", buf);
+ assert_se(parse_timestamp(buf, &y) >= 0);
+ assert_se(x == y);
+
+ assert_se(format_timestamp_relative(buf, sizeof(buf), x));
+ log_info("%s", buf);
+ assert_se(parse_timestamp(buf, &y) >= 0);
+
+ /* The two calls above will run with a slightly different local time. Make sure we are in the same
+ * range however, but give enough leeway that this is unlikely to explode. And of course,
+ * format_timestamp_relative() scales the accuracy with the distance from the current time up to one
+ * month, cover for that too. */
+ assert_se(y > x ? y - x : x - y <= USEC_PER_MONTH + USEC_PER_DAY);
+ }
+}
+
int main(int argc, char *argv[]) {
uintmax_t x;
@@ -214,6 +257,7 @@ int main(int argc, char *argv[]) {
test_get_timezones();
test_usec_add();
test_usec_sub();
+ test_format_timestamp();
/* Ensure time_t is signed */
assert_cc((time_t) -1 < (time_t) 1);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-27 14:30:41 +0000