Use initalization instead of explicit zeroing

Before, we would initialize many fields twice: first
by filling the structure with zeros, and then a second
time with the real values. We can let the compiler do
the job for us, avoiding one copy.

A downside of this patch is that text gets slightly
bigger. This is because all zero() calls are effectively
inlined:

$ size build/.libs/systemd
         text    data     bss     dec     hex filename
before 897737  107300    2560 1007597   f5fed build/.libs/systemd
after  897873  107300    2560 1007733   f6075 build/.libs/systemd

… actually less than 1‰.

A few asserts that the parameter is not null had to be removed. I
don't think this changes much, because first, it is quite unlikely
for the assert to fail, and second, an immediate SEGV is almost as
good as an assert.

1 files changed, 4 insertions, 8 deletions

diff --git a/src/tty-ask-password-agent/tty-ask-password-agent.c b/src/tty-ask-password-agent/tty-ask-password-agent.c
index 99a626c6c5..3f5706ee3c 100644
--- a/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ b/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -60,11 +60,11 @@ static int ask_password_plymouth(
                 char ***_passphrases) {
 
         int fd = -1, notify = -1;
-        union sockaddr_union sa;
+        union sockaddr_union sa = {};
         char *packet = NULL;
         ssize_t k;
         int r, n;
-        struct pollfd pollfd[2];
+        struct pollfd pollfd[2] = {};
         char buffer[LINE_MAX];
         size_t p = 0;
         enum {
@@ -91,7 +91,6 @@ static int ask_password_plymouth(
                 goto finish;
         }
 
-        zero(sa);
         sa.sa.sa_family = AF_UNIX;
         strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
         if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
@@ -116,7 +115,6 @@ static int ask_password_plymouth(
                 goto finish;
         }
 
-        zero(pollfd);
         pollfd[POLL_SOCKET].fd = fd;
         pollfd[POLL_SOCKET].events = POLLIN;
         pollfd[POLL_INOTIFY].fd = notify;
@@ -325,7 +323,7 @@ static int parse_password(const char *filename, char **wall) {
                 union {
                         struct sockaddr sa;
                         struct sockaddr_un un;
-                } sa;
+                } sa = {};
                 size_t packet_length = 0;
 
                 assert(arg_action == ACTION_QUERY ||
@@ -410,7 +408,6 @@ static int parse_password(const char *filename, char **wall) {
                         goto finish;
                 }
 
-                zero(sa);
                 sa.un.sun_family = AF_UNIX;
                 strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
 
@@ -563,7 +560,7 @@ static int watch_passwords(void) {
         };
 
         int notify = -1, signal_fd = -1, tty_block_fd = -1;
-        struct pollfd pollfd[_FD_MAX];
+        struct pollfd pollfd[_FD_MAX] = {};
         sigset_t mask;
         int r;
 
@@ -591,7 +588,6 @@ static int watch_passwords(void) {
                 goto finish;
         }
 
-        zero(pollfd);
         pollfd[FD_INOTIFY].fd = notify;
         pollfd[FD_INOTIFY].events = POLLIN;
         pollfd[FD_SIGNAL].fd = signal_fd;