lib/, src/: Rename 'unused' macro as 'MAYBE_UNUSED'

Related-To: https://github.com/shadow-maint/shadow/issues/918

Suggested-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Pablo Saavedra <psaavedra@igalia.com>

src/expiry.c

@@ -29,14 +29,14 @@ const char *Prog;
 static bool cflg = false;
 
 /* local function prototypes */
-static void catch_signals (unused int sig);
+static void catch_signals (MAYBE_UNUSED int sig);
 NORETURN static void usage (int status);
 static void process_flags (int argc, char **argv);
 
 /*
  * catch_signals - signal catcher
  */
-static void catch_signals (unused int sig)
+static void catch_signals (MAYBE_UNUSED int sig)
 {
 	_exit (10);
 }

src/gpasswd.c

@@ -101,14 +101,14 @@ static void update_group (struct group *gr);
 static void change_passwd (struct group *gr);
 #endif
 static void log_gpasswd_failure (const char *suffix);
-static void log_gpasswd_failure_system (/*@null@*/unused void *arg);
-static void log_gpasswd_failure_group (/*@null@*/unused void *arg);
+static void log_gpasswd_failure_system (/*@null@*/MAYBE_UNUSED void *arg);
+static void log_gpasswd_failure_group (/*@null@*/MAYBE_UNUSED void *arg);
 #ifdef SHADOWGRP
-static void log_gpasswd_failure_gshadow (/*@null@*/unused void *arg);
+static void log_gpasswd_failure_gshadow (/*@null@*/MAYBE_UNUSED void *arg);
 #endif
 static void log_gpasswd_success (const char *suffix);
-static void log_gpasswd_success_system (/*@null@*/unused void *arg);
-static void log_gpasswd_success_group (/*@null@*/unused void *arg);
+static void log_gpasswd_success_system (/*@null@*/MAYBE_UNUSED void *arg);
+static void log_gpasswd_success_group (/*@null@*/MAYBE_UNUSED void *arg);
 
 /*
  * usage - display usage message
@@ -480,12 +480,12 @@ static void log_gpasswd_failure (const char *suffix)
 	}
 }
 
-static void log_gpasswd_failure_system (unused void *arg)
+static void log_gpasswd_failure_system (MAYBE_UNUSED void *arg)
 {
 	log_gpasswd_failure ("");
 }
 
-static void log_gpasswd_failure_group (unused void *arg)
+static void log_gpasswd_failure_group (MAYBE_UNUSED void *arg)
 {
 	char  buf[1024];
 
@@ -494,7 +494,7 @@ static void log_gpasswd_failure_group (unused void *arg)
 }
 
 #ifdef SHADOWGRP
-static void log_gpasswd_failure_gshadow (unused void *arg)
+static void log_gpasswd_failure_gshadow (MAYBE_UNUSED void *arg)
 {
 	char  buf[1024];
 
@@ -601,12 +601,12 @@ static void log_gpasswd_success (const char *suffix)
 	}
 }
 
-static void log_gpasswd_success_system (unused void *arg)
+static void log_gpasswd_success_system (MAYBE_UNUSED void *arg)
 {
 	log_gpasswd_success ("");
 }
 
-static void log_gpasswd_success_group (unused void *arg)
+static void log_gpasswd_success_group (MAYBE_UNUSED void *arg)
 {
 	char  buf[1024];
 

src/grpconv.c

@@ -262,7 +262,7 @@ int main (int argc, char **argv)
 	return 0;
 }
 #else				/* !SHADOWGRP */
-int main (int unused(argc), char **argv)
+int main (int MAYBE_UNUSED(argc), char **argv)
 {
 	fprintf (stderr,
 		 "%s: not configured for shadow group support.\n", argv[0]);

src/grpunconv.c

@@ -224,7 +224,7 @@ int main (int argc, char **argv)
 	return 0;
 }
 #else				/* !SHADOWGRP */
-int main (int unused(argc), char **argv)
+int main (int MAYBE_UNUSED(argc), char **argv)
 {
 	fprintf (stderr,
 		 "%s: not configured for shadow group support.\n", argv[0]);

src/login.c

@@ -397,12 +397,12 @@ static void init_env (void)
 #endif				/* !USE_PAM */
 }
 
-static void exit_handler (unused int sig)
+static void exit_handler (MAYBE_UNUSED int sig)
 {
 	_exit (0);
 }
 
-static void alarm_handler (unused int sig)
+static void alarm_handler (MAYBE_UNUSED int sig)
 {
 	write_full(STDERR_FILENO, tmsg, strlen(tmsg));
 	signal(SIGALRM, exit_handler);

src/su.c

@@ -111,7 +111,7 @@ static void execve_shell (const char *shellname,
                           char *args[],
                           char *const envp[]);
 #ifdef USE_PAM
-static void kill_child (int unused(s));
+static void kill_child (int MAYBE_UNUSED(s));
 static void prepare_pam_close_session (void);
 #else				/* !USE_PAM */
 static void die (int);
@@ -165,7 +165,7 @@ static bool iswheel (const char *username)
 	return is_on_list (grp->gr_mem, username);
 }
 #else				/* USE_PAM */
-static void kill_child (int unused(s))
+static void kill_child (int MAYBE_UNUSED(s))
 {
 	if (0 != pid_child) {
 		(void) kill (-pid_child, SIGKILL);

src/sulogin.c

@@ -50,7 +50,7 @@ static void catch_signals (int);
 static int pw_entry(const char *name, struct passwd *pwent);
 
 
-static void catch_signals (unused int sig)
+static void catch_signals (MAYBE_UNUSED int sig)
 {
 	_exit (1);
 }