man: move more examples to stand-alone files and use 2-space indentation consistenty

Moving them out makes it easier to run them through a compiler, use automatic
indentation, and opens the possibility to provide a download link in the
future. I verified that all examples compile cleanly.

(2-space indentation is used because the examples are already significantly
indented in the man page, and we need to keep them narrow so that they display
well on standard terminals.)

1 files changed, 11 insertions, 0 deletions

diff --git a/man/id128-app-specific.c b/man/id128-app-specific.c
new file mode 100644
index 0000000000..b81e50ff32
--- /dev/null
+++ b/man/id128-app-specific.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <systemd/sd-id128.h>
+
+#define OUR_APPLICATION_ID SD_ID128_MAKE(c2,73,27,73,23,db,45,4e,a6,3b,b9,6e,79,b5,3e,97)
+
+int main(int argc, char *argv[]) {
+  sd_id128_t id;
+  sd_id128_get_machine_app_specific(OUR_APPLICATION_ID, &id);
+  printf("Our application ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(id));
+  return 0;
+}