initctl: let -q silence all commands

This patch introduces ERR(), ERRX(), WARN(), and WARNX() as replacements
to their lower case counterparts.  These log macros respect the 'quiet'
flag to initctl, leaving only the return code as indicator to user.

Fixes #266

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/initctl.h

@@ -24,6 +24,8 @@
 #ifndef FINIT_INITCTL_H_
 #define FINIT_INITCTL_H_
 
+#include <err.h>
+
 #include "finit.h"
 #include "util.h"
 
@@ -33,6 +35,12 @@ extern int ionce;			/* initctl -1 */
 extern int heading;			/* initctl -t */
 extern int verbose;			/* initctl -v */
 extern int plain;			/* initctl -p */
+extern int quiet;			/* initctl -q */
+
+#define ERR(rc, fmt, args...)  do { if (!quiet) err(rc, fmt, ##args);  else exit(rc); } while (0)
+#define ERRX(rc, fmt, args...) do { if (!quiet) errx(rc, fmt, ##args); else exit(rc); } while (0)
+#define WARN(fmt, args...)     do { if (!quiet) warn(fmt, ##args);  } while (0)
+#define WARNX(fmt, args...)    do { if (!quiet) warnx(fmt, ##args); } while (0)
 
 extern void print_header(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));