tree-wide: drop !! casts to booleans

They are not needed, because anything that is non-zero is converted
to true.

C11:
> 6.3.1.2: When any scalar value is converted to _Bool, the result is 0 if the
> value compares equal to 0; otherwise, the result is 1.

https://stackoverflow.com/questions/31551888/casting-int-to-bool-in-c-c

18 files changed, 40 insertions, 28 deletions

diff --git a/coccinelle/bool-cast.cocci b/coccinelle/bool-cast.cocci
new file mode 100644
index 0000000000..051ccb9417
--- /dev/null
+++ b/coccinelle/bool-cast.cocci
@@ -0,0 +1,12 @@
+@@
+bool b;
+expression y;
+@@
+- b = !!(y);
++ b = y;
+@@
+bool b;
+expression y;
+@@
+- b = !!y;
++ b = y;
diff --git a/src/analyze/analyze.c b/src/analyze/analyze.c
index 8695e7a1d2..906ddfbc28 100644
--- a/src/analyze/analyze.c
+++ b/src/analyze/analyze.c
@@ -1833,7 +1833,7 @@ static int parse_argv(int argc, char *argv[]) {
                                         return -EINVAL;
                                 }
 
-                                arg_man = !!r;
+                                arg_man = r;
                         } else
                                 arg_man = true;
 
@@ -1847,7 +1847,7 @@ static int parse_argv(int argc, char *argv[]) {
                                         return -EINVAL;
                                 }
 
-                                arg_generators = !!r;
+                                arg_generators = r;
                         } else
                                 arg_generators = true;
 
diff --git a/src/basic/btrfs-util.c b/src/basic/btrfs-util.c
index 32a022f7ce..b325090ed9 100644
--- a/src/basic/btrfs-util.c
+++ b/src/basic/btrfs-util.c
@@ -500,7 +500,7 @@ int btrfs_subvol_get_info_fd(int fd, uint64_t subvol_id, BtrfsSubvolInfo *ret) {
                                 (usec_t) le32toh(ri->otime.nsec) / NSEC_PER_USEC;
 
                         ret->subvol_id = subvol_id;
-                        ret->read_only = !!(le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY);
+                        ret->read_only = le64toh(ri->flags) & BTRFS_ROOT_SUBVOL_RDONLY;
 
                         assert_cc(sizeof(ri->uuid) == sizeof(ret->uuid));
                         memcpy(&ret->uuid, ri->uuid, sizeof(ret->uuid));
diff --git a/src/basic/format-table.c b/src/basic/format-table.c
index ad89556ee2..94e796d1ca 100644
--- a/src/basic/format-table.c
+++ b/src/basic/format-table.c
@@ -572,7 +572,7 @@ int table_add_many_internal(Table *t, TableDataType first_type, ...) {
                         break;
 
                 case TABLE_BOOLEAN:
-                        buffer.b = !!va_arg(ap, int);
+                        buffer.b = va_arg(ap, int);
                         data = &buffer.b;
                         break;
 
diff --git a/src/basic/verbs.c b/src/basic/verbs.c
index 58076ac07c..057e35dcd0 100644
--- a/src/basic/verbs.c
+++ b/src/basic/verbs.c
@@ -81,7 +81,7 @@ int dispatch_verb(int argc, char *argv[], const Verb verbs[], void *userdata) {
                 if (name)
                         found = streq(name, verbs[i].verb);
                 else
-                        found = !!(verbs[i].flags & VERB_DEFAULT);
+                        found = verbs[i].flags & VERB_DEFAULT;
 
                 if (found) {
                         verb = &verbs[i];
diff --git a/src/basic/virt.c b/src/basic/virt.c
index 9da5feca6c..0ebccd4ebb 100644
--- a/src/basic/virt.c
+++ b/src/basic/virt.c
@@ -56,7 +56,7 @@ static int detect_vm_cpuid(void) {
         if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0)
                 return VIRTUALIZATION_NONE;
 
-        hypervisor = !!(ecx & 0x80000000U);
+        hypervisor = ecx & 0x80000000U;
 
         if (hypervisor) {
                 union {
diff --git a/src/busctl/busctl.c b/src/busctl/busctl.c
index 5c65147cac..d6844057d3 100644
--- a/src/busctl/busctl.c
+++ b/src/busctl/busctl.c
@@ -1972,7 +1972,7 @@ static int parse_argv(int argc, char *argv[]) {
                                 return r;
                         }
 
-                        arg_expect_reply = !!r;
+                        arg_expect_reply = r;
                         break;
 
                 case ARG_AUTO_START:
@@ -1982,7 +1982,7 @@ static int parse_argv(int argc, char *argv[]) {
                                 return r;
                         }
 
-                        arg_auto_start = !!r;
+                        arg_auto_start = r;
                         break;
 
                 case ARG_ALLOW_INTERACTIVE_AUTHORIZATION:
@@ -1992,7 +1992,7 @@ static int parse_argv(int argc, char *argv[]) {
                                 return r;
                         }
 
-                        arg_allow_interactive_authorization = !!r;
+                        arg_allow_interactive_authorization = r;
                         break;
 
                 case ARG_TIMEOUT:
@@ -2011,7 +2011,7 @@ static int parse_argv(int argc, char *argv[]) {
                                 return r;
                         }
 
-                        arg_augment_creds = !!r;
+                        arg_augment_creds = r;
                         break;
 
                 case ARG_WATCH_BIND:
@@ -2021,7 +2021,7 @@ static int parse_argv(int argc, char *argv[]) {
                                 return r;
                         }
 
-                        arg_watch_bind = !!r;
+                        arg_watch_bind = r;
                         break;
 
                 case '?':
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index 747b9d8eeb..52d0487c93 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -563,7 +563,7 @@ static int property_get_bind_paths(
         assert(property);
         assert(reply);
 
-        ro = !!strstr(property, "ReadOnly");
+        ro = strstr(property, "ReadOnly");
 
         r = sd_bus_message_open_container(reply, 'a', "(ssbt)");
         if (r < 0)
diff --git a/src/core/namespace.c b/src/core/namespace.c
index 2523c2a47f..bb19e18e43 100644
--- a/src/core/namespace.c
+++ b/src/core/namespace.c
@@ -322,7 +322,7 @@ static int append_tmpfs_mounts(MountEntry **p, const TemporaryFileSystem *tmpfs,
                         if (r < 0)
                                 return r;
 
-                        ro = !!(flags & MS_RDONLY);
+                        ro = flags & MS_RDONLY;
                         if (ro)
                                 flags ^= MS_RDONLY;
                 }
diff --git a/src/core/service.c b/src/core/service.c
index 33fd36f8a7..824d283f34 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -3215,7 +3215,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
                                          * The PID file might actually be created by a START_POST
                                          * script. In that case don't worry if the loading fails. */
 
-                                        has_start_post = !!s->exec_command[SERVICE_EXEC_START_POST];
+                                        has_start_post = s->exec_command[SERVICE_EXEC_START_POST];
                                         r = service_load_pid_file(s, !has_start_post);
                                         if (!has_start_post && r < 0) {
                                                 r = service_demand_pid_file(s);
diff --git a/src/core/shutdown.c b/src/core/shutdown.c
index 63fd4c8da1..ffd80d7876 100644
--- a/src/core/shutdown.c
+++ b/src/core/shutdown.c
@@ -302,7 +302,7 @@ int main(int argc, char *argv[]) {
         (void) cg_get_root_path(&cgroup);
         in_container = detect_container() > 0;
 
-        use_watchdog = !!getenv("WATCHDOG_USEC");
+        use_watchdog = getenv("WATCHDOG_USEC");
         watchdog_device = getenv("WATCHDOG_DEVICE");
         if (watchdog_device) {
                 r = watchdog_set_device(watchdog_device);
diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
index 4975aba016..5cf9f40c20 100644
--- a/src/journal/journald-stream.c
+++ b/src/journal/journald-stream.c
@@ -378,7 +378,7 @@ static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
                         return -EINVAL;
                 }
 
-                s->level_prefix = !!r;
+                s->level_prefix = r;
                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
                 return 0;
 
@@ -389,7 +389,7 @@ static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
                         return -EINVAL;
                 }
 
-                s->forward_to_syslog = !!r;
+                s->forward_to_syslog = r;
                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
                 return 0;
 
@@ -400,7 +400,7 @@ static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
                         return -EINVAL;
                 }
 
-                s->forward_to_kmsg = !!r;
+                s->forward_to_kmsg = r;
                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
                 return 0;
 
@@ -411,7 +411,7 @@ static int stdout_stream_line(StdoutStream *s, char *p, LineBreak line_break) {
                         return -EINVAL;
                 }
 
-                s->forward_to_console = !!r;
+                s->forward_to_console = r;
                 s->state = STDOUT_STREAM_RUNNING;
 
                 /* Try to save the stream, so that journald can be restarted and we can recover */
diff --git a/src/login/logind-dbus.c b/src/login/logind-dbus.c
index 3fe38c0527..21fdc0912d 100644
--- a/src/login/logind-dbus.c
+++ b/src/login/logind-dbus.c
@@ -242,9 +242,9 @@ static int property_get_preparing(
         assert(m);
 
         if (streq(property, "PreparingForShutdown"))
-                b = !!(m->action_what & INHIBIT_SHUTDOWN);
+                b = m->action_what & INHIBIT_SHUTDOWN;
         else
-                b = !!(m->action_what & INHIBIT_SLEEP);
+                b = m->action_what & INHIBIT_SLEEP;
 
         return sd_bus_message_append(reply, "b", b);
 }
diff --git a/src/network/networkd-dhcp6.c b/src/network/networkd-dhcp6.c
index e9db977036..3f8346fee8 100644
--- a/src/network/networkd-dhcp6.c
+++ b/src/network/networkd-dhcp6.c
@@ -406,7 +406,7 @@ int dhcp6_request_address(Link *link, int ir) {
         if (r < 0)
                 return r;
         else
-                running = !!r;
+                running = r;
 
         if (running) {
                 r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
diff --git a/src/shared/bus-util.c b/src/shared/bus-util.c
index bae419d63b..ddbc9d934e 100644
--- a/src/shared/bus-util.c
+++ b/src/shared/bus-util.c
@@ -1090,9 +1090,9 @@ static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, unsigne
                         return r;
 
                 if (flags & BUS_MAP_BOOLEAN_AS_BOOL)
-                        * (bool*) userdata = !!b;
+                        *(bool*) userdata = b;
                 else
-                        * (int*) userdata = b;
+                        *(int*) userdata = b;
 
                 return 0;
         }
@@ -1403,7 +1403,7 @@ int bus_property_set_bool(
         if (r < 0)
                 return r;
 
-        *(bool *) userdata = !!b;
+        *(bool*) userdata = b;
         return 0;
 }
 
diff --git a/src/shared/condition.c b/src/shared/condition.c
index a41a782664..18ab1f89f9 100644
--- a/src/shared/condition.c
+++ b/src/shared/condition.c
@@ -103,7 +103,7 @@ static int condition_test_kernel_command_line(Condition *c) {
         if (r < 0)
                 return r;
 
-        equal = !!strchr(c->parameter, '=');
+        equal = strchr(c->parameter, '=');
 
         for (p = line;;) {
                 _cleanup_free_ char *word = NULL;
diff --git a/src/shared/conf-parser.c b/src/shared/conf-parser.c
index 4a41b814ae..b1250850d5 100644
--- a/src/shared/conf-parser.c
+++ b/src/shared/conf-parser.c
@@ -632,7 +632,7 @@ int config_parse_bool(const char* unit,
                 return fatal ? -ENOEXEC : 0;
         }
 
-        *b = !!k;
+        *b = k;
         return 0;
 }
 
diff --git a/src/timedate/timedatectl.c b/src/timedate/timedatectl.c
index e52a64a9c5..f412082265 100644
--- a/src/timedate/timedatectl.c
+++ b/src/timedate/timedatectl.c
@@ -477,7 +477,7 @@ static int map_ntp_message(sd_bus *bus, const char *member, sd_bus_message *m, s
 
         memcpy(p->reference.str, d, sz);
 
-        p->spike = !!b;
+        p->spike = b;
 
         return 0;
 }