From 8afe4259a8add0d042950015d34afc95a221ad96 Mon Sep 17 00:00:00 2001

From: Lennart Poettering <lennart@poettering.net>

Date: Wed, 6 Jul 2016 13:47:07 +0200

Subject: [PATCH] time-util: add parse_time(), which is like parse_sec() but

 allows specification of default time unit if none is specified

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This is useful if we want to parse RLIMIT_RTTIME values where the common

UNIX syntax is without any units but refers to a non-second unit (µs in

this case), but where we want to allow specification of units.

Cherry-picked from: 519cffec890510f817740d07355e911b10c203b7

Related: #1351415

---

 src/shared/calendarspec.c |  4 ++--

 src/shared/time-util.c    | 34 ++++++++++++++++++++++------------

 src/shared/time-util.h    |  1 +

 src/test/test-time.c      | 23 +++++++++++++++++++++++

 src/test/test-unit-file.c |  6 +++---

 5 files changed, 51 insertions(+), 17 deletions(-)

diff --git a/src/shared/calendarspec.c b/src/shared/calendarspec.c

index 2fde3e1..abbf026 100644

--- a/src/shared/calendarspec.c

+++ b/src/shared/calendarspec.c

@@ -556,7 +556,7 @@ static int parse_date(const char **p, CalendarSpec *c) {

         return -EINVAL;

 }

-static int parse_time(const char **p, CalendarSpec *c) {

+static int parse_calendar_time(const char **p, CalendarSpec *c) {

         CalendarComponent *h = NULL, *m = NULL, *s = NULL;

         const char *t;

         int r;

@@ -789,7 +789,7 @@ int calendar_spec_from_string(const char *p, CalendarSpec **spec) {

                 if (r < 0)

                         goto fail;

-                r = parse_time(&p, c);

+                r = parse_calendar_time(&p, c);

                 if (r < 0)

                         goto fail;

diff --git a/src/shared/time-util.c b/src/shared/time-util.c

index 1c36c57..c001f52 100644

--- a/src/shared/time-util.c

+++ b/src/shared/time-util.c

@@ -613,7 +613,8 @@ finish:

         return 0;

 }

-int parse_sec(const char *t, usec_t *usec) {

+int parse_time(const char *t, usec_t *usec, usec_t default_unit) {

+

         static const struct {

                 const char *suffix;

                 usec_t usec;

@@ -645,7 +646,6 @@ int parse_sec(const char *t, usec_t *usec) {

                 { "y", USEC_PER_YEAR },

                 { "usec", 1ULL },

                 { "us", 1ULL },

-                { "", USEC_PER_SEC }, /* default is sec */

         };

         const char *p, *s;

@@ -654,6 +654,7 @@ int parse_sec(const char *t, usec_t *usec) {

         assert(t);

         assert(usec);

+        assert(default_unit > 0);

         p = t;

@@ -672,6 +673,7 @@ int parse_sec(const char *t, usec_t *usec) {

                 long long l, z = 0;

                 char *e;

                 unsigned i, n = 0;

+                usec_t multiplier, k;

                 p += strspn(p, WHITESPACE);

@@ -714,21 +716,24 @@ int parse_sec(const char *t, usec_t *usec) {

                 for (i = 0; i < ELEMENTSOF(table); i++)

                         if (startswith(e, table[i].suffix)) {

-                                usec_t k = (usec_t) z * table[i].usec;

-

-                                for (; n > 0; n--)

-                                        k /= 10;

-

-                                r += (usec_t) l * table[i].usec + k;

+                                multiplier = table[i].usec;

                                 p = e + strlen(table[i].suffix);

-

-                                something = true;

                                 break;

                         }

-                if (i >= ELEMENTSOF(table))

-                        return -EINVAL;

+                if (i >= ELEMENTSOF(table)) {

+                        multiplier = default_unit;

+                        p = e;

+                }

+

+                something = true;

+

+                k = (usec_t) z * multiplier;

+

+                for (; n > 0; n--)

+                        k /= 10;

+                r += (usec_t) l * multiplier + k;

         }

         *usec = r;

@@ -736,6 +741,11 @@ int parse_sec(const char *t, usec_t *usec) {

         return 0;

 }

+

+int parse_sec(const char *t, usec_t *usec) {

+        return parse_time(t, usec, USEC_PER_SEC);

+}

+

 int parse_nsec(const char *t, nsec_t *nsec) {

         static const struct {

                 const char *suffix;

diff --git a/src/shared/time-util.h b/src/shared/time-util.h

index fca8a4d..f278914 100644

--- a/src/shared/time-util.h

+++ b/src/shared/time-util.h

@@ -99,6 +99,7 @@ void dual_timestamp_deserialize(const char *value, dual_timestamp *t);

 int parse_timestamp(const char *t, usec_t *usec);

 int parse_sec(const char *t, usec_t *usec);

+int parse_time(const char *t, usec_t *usec, usec_t default_unit);

 int parse_nsec(const char *t, nsec_t *nsec);

 bool ntp_synced(void);

diff --git a/src/test/test-time.c b/src/test/test-time.c

index 3840fff..820e4aa 100644

--- a/src/test/test-time.c

+++ b/src/test/test-time.c

@@ -57,6 +57,28 @@ static void test_parse_sec(void) {

         assert_se(parse_sec(".3 infinity", &u) < 0);

 }

+static void test_parse_time(void) {

+        usec_t u;

+

+        assert_se(parse_time("5", &u, 1) >= 0);

+        assert_se(u == 5);

+

+        assert_se(parse_time("5", &u, USEC_PER_MSEC) >= 0);

+        assert_se(u == 5 * USEC_PER_MSEC);

+

+        assert_se(parse_time("5", &u, USEC_PER_SEC) >= 0);

+        assert_se(u == 5 * USEC_PER_SEC);

+

+        assert_se(parse_time("5s", &u, 1) >= 0);

+        assert_se(u == 5 * USEC_PER_SEC);

+

+        assert_se(parse_time("5s", &u, USEC_PER_SEC) >= 0);

+        assert_se(u == 5 * USEC_PER_SEC);

+

+        assert_se(parse_time("5s", &u, USEC_PER_MSEC) >= 0);

+        assert_se(u == 5 * USEC_PER_SEC);

+}

+

 static void test_parse_nsec(void) {

         nsec_t u;

@@ -161,6 +183,7 @@ static void test_get_timezones(void) {

 int main(int argc, char *argv[]) {

         test_parse_sec();

+        test_parse_time();

         test_parse_nsec();

         test_format_timespan(1);

         test_format_timespan(USEC_PER_MSEC);

diff --git a/src/test/test-unit-file.c b/src/test/test-unit-file.c

index d151737..87c81cc 100644

--- a/src/test/test-unit-file.c

+++ b/src/test/test-unit-file.c

@@ -559,7 +559,7 @@ static void test_config_parse_rlimit(void) {

         assert_se(rl[RLIMIT_NOFILE]->rlim_cur == RLIM_INFINITY);

         assert_se(rl[RLIMIT_NOFILE]->rlim_cur == rl[RLIMIT_NOFILE]->rlim_max);

-        rl[RLIMIT_NOFILE] = free(rl[RLIMIT_NOFILE]);

+        free(rl[RLIMIT_NOFILE]);

         assert_se(config_parse_sec_limit(NULL, "fake", 1, "section", 1, "LimitCPU", RLIMIT_CPU, "56", rl, NULL) >= 0);

         assert_se(rl[RLIMIT_CPU]);

         assert_se(rl[RLIMIT_CPU]->rlim_cur == 56);

@@ -580,7 +580,7 @@ static void test_config_parse_rlimit(void) {

         assert_se(rl[RLIMIT_CPU]->rlim_cur == 2);

         assert_se(rl[RLIMIT_CPU]->rlim_cur == rl[RLIMIT_CPU]->rlim_max);

-        rl[RLIMIT_CPU] = free(rl[RLIMIT_CPU]);

+        free(rl[RLIMIT_CPU]);

         assert_se(config_parse_usec_limit(NULL, "fake", 1, "section", 1, "LimitRTTIME", RLIMIT_RTTIME, "58", rl, NULL) >= 0);

         assert_se(rl[RLIMIT_RTTIME]);

@@ -602,7 +602,7 @@ static void test_config_parse_rlimit(void) {

         assert_se(rl[RLIMIT_RTTIME]->rlim_cur == 2345 * USEC_PER_MSEC);

         assert_se(rl[RLIMIT_RTTIME]->rlim_cur == rl[RLIMIT_RTTIME]->rlim_max);

-        rl[RLIMIT_RTTIME] = free(rl[RLIMIT_RTTIME]);

+        free(rl[RLIMIT_RTTIME]);

 }

 int main(int argc, char *argv[]) {