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authorJosh Triplett <josh@joshtriplett.org>2014-03-15 11:40:07 -0700
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-03-16 09:52:56 -0400
commitf8294e4175918117ca6c131720bcf287eadcd029 (patch)
treec5b2f4d3088fbd4fd75989b3f7eed128681951e1 /src/libsystemd
parent039dd4afd64a8c8413ff28d43f533c30c5a06a16 (diff)
Use strlen even for constant strings
GCC optimizes strlen("string constant") to a constant, even with -O0. Thus, replace patterns like sizeof("string constant")-1 with strlen("string constant") where possible, for clarity. In particular, for expressions intended to add up the lengths of components going into a string, this often makes it clearer that the expression counts the trailing '\0' exactly once, by putting the +1 for the '\0' at the end of the expression, rather than hidden in a sizeof in the middle of the expression.
Diffstat (limited to 'src/libsystemd')
-rw-r--r--src/libsystemd/sd-bus/bus-kernel.c4
-rw-r--r--src/libsystemd/sd-bus/bus-socket.c4
-rw-r--r--src/libsystemd/sd-bus/bus-track.c2
3 files changed, 5 insertions, 5 deletions
diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index 80ef15bd42..5c955f4a07 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -1390,7 +1390,7 @@ int bus_kernel_create_starter(const char *bus, const char *name, BusNamePolicy *
assert(bus);
assert(name);
- p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus"));
+ p = alloca(strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1);
sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus);
fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
@@ -1502,7 +1502,7 @@ int bus_kernel_create_monitor(const char *bus) {
assert(bus);
- p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus"));
+ p = alloca(strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1);
sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus);
fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
diff --git a/src/libsystemd/sd-bus/bus-socket.c b/src/libsystemd/sd-bus/bus-socket.c
index 0c4b6af447..016f8a1c9f 100644
--- a/src/libsystemd/sd-bus/bus-socket.c
+++ b/src/libsystemd/sd-bus/bus-socket.c
@@ -227,8 +227,8 @@ static int bus_socket_auth_verify_client(sd_bus *b) {
if (f)
b->can_fds =
- (f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) &&
- memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0;
+ (f - e == strlen("\r\nAGREE_UNIX_FD")) &&
+ memcmp(e + 2, "AGREE_UNIX_FD", strlen("AGREE_UNIX_FD")) == 0;
b->rbuffer_size -= (start - (char*) b->rbuffer);
memmove(b->rbuffer, start, b->rbuffer_size);
diff --git a/src/libsystemd/sd-bus/bus-track.c b/src/libsystemd/sd-bus/bus-track.c
index fd368e4368..e21959d01d 100644
--- a/src/libsystemd/sd-bus/bus-track.c
+++ b/src/libsystemd/sd-bus/bus-track.c
@@ -51,7 +51,7 @@ struct sd_bus_track {
({ \
char *_x; \
size_t _l = strlen(name); \
- _x = alloca(sizeof(MATCH_PREFIX)-1+_l+sizeof(MATCH_SUFFIX)); \
+ _x = alloca(strlen(MATCH_PREFIX)+_l+strlen(MATCH_SUFFIX)+1); \
strcpy(stpcpy(stpcpy(_x, MATCH_PREFIX), name), MATCH_SUFFIX); \
_x; \
})