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>

src/click.c

@@ -46,6 +46,9 @@ static bool tiling_resize_for_border(Con *con, border_t border, xcb_button_press
         case BORDER_BOTTOM:
             search_direction = D_DOWN;
             break;
+        default:
+            assert(false);
+            break;
     }
 
     bool res = resize_find_tiling_participants(&first, &second, search_direction);

src/config_parser.c

@@ -778,14 +778,9 @@ static char *migrate_config(char *input, off_t size) {
 
     /* write the whole config file to the pipe, the script will read everything
      * immediately */
-    int written = 0;
-    int ret;
-    while (written < size) {
-        if ((ret = write(writepipe[1], input + written, size - written)) < 0) {
-            warn("Could not write to pipe");
-            return NULL;
-        }
-        written += ret;
+    if (writeall(writepipe[1], input, size) == -1) {
+        warn("Could not write to pipe");
+        return NULL;
     }
     close(writepipe[1]);
 
@@ -795,7 +790,7 @@ static char *migrate_config(char *input, off_t size) {
     /* read the script’s output */
     int conv_size = 65535;
     char *converted = malloc(conv_size);
-    int read_bytes = 0;
+    int read_bytes = 0, ret;
     do {
         if (read_bytes == conv_size) {
             conv_size += 65535;

src/load_layout.c

@@ -105,7 +105,7 @@ static int json_end_map(void *ctx) {
             int cnt = 1;
             while (workspace != NULL) {
                 FREE(json_node->name);
-                asprintf(&(json_node->name), "%s_%d", base, cnt++);
+                sasprintf(&(json_node->name), "%s_%d", base, cnt++);
                 workspace = NULL;
                 TAILQ_FOREACH(output, &(croot->nodes_head), nodes)
                 GREP_FIRST(workspace, output_get_content(output), !strcasecmp(child->name, json_node->name));

src/sighandler.c

@@ -70,8 +70,14 @@ static int backtrace(void) {
         int stdin_pipe[2],
             stdout_pipe[2];
 
-        pipe(stdin_pipe);
-        pipe(stdout_pipe);
+        if (pipe(stdin_pipe) == -1) {
+            ELOG("Failed to init stdin_pipe\n");
+            return -1;
+        }
+        if (pipe(stdout_pipe) == -1) {
+            ELOG("Failed to init stdout_pipe\n");
+            return -1;
+        }
 
         /* close standard streams in case i3 is started from a terminal; gdb
          * needs to run without controlling terminal for it to work properly in

src/util.c

@@ -265,25 +265,13 @@ char *store_restart_layout(void) {
         return NULL;
     }
 
-    size_t written = 0;
-    while (written < length) {
-        int n = write(fd, payload + written, length - written);
-        /* TODO: correct error-handling */
-        if (n == -1) {
-            perror("write()");
-            free(filename);
-            close(fd);
-            return NULL;
-        }
-        if (n == 0) {
-            DLOG("write == 0?\n");
-            free(filename);
-            close(fd);
-            return NULL;
-        }
-        written += n;
-        DLOG("written: %zd of %zd\n", written, length);
+    if (writeall(fd, payload, length) == -1) {
+        ELOG("Could not write restart layout to \"%s\", layout will be lost: %s\n", filename, strerror(errno));
+        free(filename);
+        close(fd);
+        return NULL;
     }
+
     close(fd);
 
     if (length > 0) {