[PATCH ucspi-vsock] Factor out set_verbosity()

[Alyssa Ross <hi@alyssa.is>]

This will save some cognitive load when reading main functions.
---
 log.c         | 20 +++++++++++++++++++-
 log.h         |  5 +++++
 vsockclient.c |  6 +-----
 vsockserver.c |  6 +-----
 4 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/log.c b/log.c
index 385d39f..cdfacd6 100644
--- a/log.c
+++ b/log.c
@@ -1,15 +1,33 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
-// SPDX-FileCopyrightText: 2020 Alyssa Ross <hi@alyssa.is>
+// SPDX-FileCopyrightText: 2020-2021 Alyssa Ross <hi@alyssa.is>
 
 #define _GNU_SOURCE
 
 #include "log.h"
 
 #include <err.h>
+#include <stdbool.h>
 #include <stdlib.h>
 
 enum verbosity verbosity = errors;
 
+bool set_verbosity(int opt)
+{
+	switch (opt) {
+	case 'q':
+		verbosity = nothing;
+		return true;
+	case 'Q':
+		verbosity = errors;
+		return true;
+	case 'v':
+		verbosity = all;
+		return true;
+	}
+
+	return false;
+}
+
 void veloge(const char *fmt, va_list args)
 {
 	if (verbosity)
diff --git a/log.h b/log.h
index ea9e9cf..7b40e48 100644
--- a/log.h
+++ b/log.h
@@ -11,6 +11,11 @@ enum verbosity {
 
 extern enum verbosity verbosity;
 
+// If opt is a character that matches a standard UCSPI command line
+// verbosity option, sets the verbosity appropriately and returns
+// true.  Otherwise, returns false.
+_Bool set_verbosity(int opt);
+
 // Log an error message, followed by strerrno(errno), then exit with
 // status eval.
 _Noreturn void diee(int eval, const char *fmt, ...);
diff --git a/vsockclient.c b/vsockclient.c
index 91e1320..d25ab13 100644
--- a/vsockclient.c
+++ b/vsockclient.c
@@ -35,13 +35,9 @@ int main(int argc, char *argv[])
 	while ((opt = getopt(argc, argv, "+qQv")) != -1) {
 		switch (opt) {
 		case 'q':
-			verbosity = nothing;
-			break;
 		case 'Q':
-			verbosity = errors;
-			break;
 		case 'v':
-			verbosity = all;
+			set_verbosity(opt);
 			break;
 		default:
 			ex_usage();
diff --git a/vsockserver.c b/vsockserver.c
index 03d9838..4c251b0 100644
--- a/vsockserver.c
+++ b/vsockserver.c
@@ -43,13 +43,9 @@ int main(int argc, char *argv[])
 			notify = true;
 			break;
 		case 'q':
-			verbosity = nothing;
-			break;
 		case 'Q':
-			verbosity = errors;
-			break;
 		case 'v':
-			verbosity = all;
+			set_verbosity(opt);
 			break;
 		default:
 			ex_usage();
-- 
2.30.0