Set C99 standard compliance

Signed-off-by: Artem Senichev <[email protected]>

meson.build

@@ -4,11 +4,12 @@ project(
   'swayimg',
   'c',
   default_options: [
+    'c_std=c99',
     'warning_level=3',
-    ],
+  ],
   license: 'Apache-2.0',
   version: '1.0',
-  )
+)
 
 # most of Wayland callback functions are not used
 add_project_arguments(

src/viewer.c

@@ -357,7 +357,7 @@ bool show_image(const struct viewer* params)
     } else {
         struct timeval tv;
         gettimeofday(&tv, NULL);
-        app_id = format_string(APP_NAME "_%lx", tv.tv_usec);
+        app_id = format_string(APP_NAME "_%lx", tv.tv_sec << 32 | tv.tv_usec);
         wnd.app_id = app_id;
     }
 

src/window.c

@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: Apache-2.0
 // Copyright (C) 2020 Artem Senichev <[email protected]>
 
+// ftruncate() support
+#define _POSIX_C_SOURCE 200112
+
 #include "window.h"
 #include "xdg-shell-protocol.h"
 #include "config.h"
@@ -79,7 +82,7 @@ static int create_shmem(size_t sz, void** data)
     char path[64];
     struct timeval tv;
     gettimeofday(&tv, NULL);
-    snprintf(path, sizeof(path), "/" APP_NAME "_%lx", tv.tv_usec);
+    snprintf(path, sizeof(path), "/" APP_NAME "_%lx", tv.tv_sec << 32 | tv.tv_usec);
 
     int fd = shm_open(path, O_RDWR | O_CREAT | O_EXCL, 0600);
     if (fd == -1) {