Add a safe wrapper for write and fix some warnings

1. Add a function writeall and make swrite wrap that function. Use either writeall or swrite, depending on whether we want to exit on errors or not.
2. Fix warnings when compiling with a higher optimisation level.
(CFLAGS ?= -pipe -O3 -march=native -mtune=native -freorder-blocks-and-partition)

Signed-off-by: hwangcc <hwangcc@csie.nctu.edu.tw>

1 files changed, 3 insertions, 8 deletions

diff --git a/i3-dump-log/main.c b/i3-dump-log/main.c
index 86b39338..1b0d593c 100644
--- a/i3-dump-log/main.c
+++ b/i3-dump-log/main.c
@@ -43,8 +43,7 @@ static int check_for_wrap(void) {
      * of the log. */
     wrap_count = header->wrap_count;
     const int len = (logbuffer + header->offset_last_wrap) - walk;
-    if (write(STDOUT_FILENO, walk, len) != len)
-        err(EXIT_FAILURE, "write()");
+    swrite(STDOUT_FILENO, walk, len);
     walk = logbuffer + sizeof(i3_shmlog_header);
     return 1;
 }
@@ -52,12 +51,8 @@ static int check_for_wrap(void) {
 static void print_till_end(void) {
     check_for_wrap();
     const int len = (logbuffer + header->offset_next_write) - walk;
-    const int n = write(STDOUT_FILENO, walk, len);
-    if (len != n)
-        err(EXIT_FAILURE, "write()");
-    if (n > 0) {
-        walk += n;
-    }
+    swrite(STDOUT_FILENO, walk, len);
+    walk += len;
 }
 
 int main(int argc, char *argv[]) {