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From:   Sonny Sasaka <sonnysasaka@chromium.org>
To:     linux-bluetooth@vger.kernel.org
Cc:     Sonny Sasaka <sonnysasaka@chromium.org>,
        Daniel Winkler <danielwinkler@google.com>
Subject: [PATCH BlueZ v4] monitor: Add option to set fallback width
Date:   Mon,  1 Mar 2021 16:40:19 -0800
Message-Id: <20210302004019.7150-1-sonnysasaka@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Sometimes we want to be able to pipe the output of btmon to a
non-terminal device. The current fallback width is usually not long
enough so this patch adds an option to specify the column width. This is
especially needed for text logs from bluetoothd.

Reviewed-by: Daniel Winkler <danielwinkler@google.com>

---
 monitor/display.c | 8 +++++++-
 monitor/display.h | 1 +
 monitor/main.c    | 8 +++++++-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/monitor/display.c b/monitor/display.c
index b11b71d5d..4e5693b04 100644
--- a/monitor/display.c
+++ b/monitor/display.c
@@ -28,6 +28,7 @@
 #include "display.h"
 
 static pid_t pager_pid = 0;
+int default_pager_num_columns = FALLBACK_TERMINAL_WIDTH;
 
 bool use_color(void)
 {
@@ -39,6 +40,11 @@ bool use_color(void)
 	return cached_use_color;
 }
 
+void set_default_pager_num_columns(int num_columns)
+{
+	default_pager_num_columns = num_columns;
+}
+
 int num_columns(void)
 {
 	static int cached_num_columns = -1;
@@ -48,7 +54,7 @@ int num_columns(void)
 
 		if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0 ||
 								ws.ws_col == 0)
-			cached_num_columns = FALLBACK_TERMINAL_WIDTH;
+			cached_num_columns = default_pager_num_columns;
 		else
 			cached_num_columns = ws.ws_col;
 	}
diff --git a/monitor/display.h b/monitor/display.h
index f3a614b81..cba39ec7f 100644
--- a/monitor/display.h
+++ b/monitor/display.h
@@ -73,6 +73,7 @@ static inline uint64_t print_bitfield(int indent, uint64_t val,
 	return mask;
 }
 
+void set_default_pager_num_columns(int num_columns);
 int num_columns(void);
 
 void open_pager(void);
diff --git a/monitor/main.c b/monitor/main.c
index 0f5eb4a3b..969c88103 100644
--- a/monitor/main.c
+++ b/monitor/main.c
@@ -30,6 +30,7 @@
 #include "analyze.h"
 #include "ellisys.h"
 #include "control.h"
+#include "display.h"
 
 static void signal_callback(int signum, void *user_data)
 {
@@ -67,6 +68,7 @@ static void usage(void)
 		"\t                       Read data from RTT\n"
 		"\t-R  --rtt [<address>],[<area>],[<name>]\n"
 		"\t                       RTT control block parameters\n"
+		"\t-C, --columns [width]  Output width if not a terminal\n"
 		"\t-h, --help             Show help options\n");
 }
 
@@ -90,6 +92,7 @@ static const struct option main_options[] = {
 	{ "no-pager",  no_argument,       NULL, 'P' },
 	{ "jlink",     required_argument, NULL, 'J' },
 	{ "rtt",       required_argument, NULL, 'R' },
+	{ "columns",   required_argument, NULL, 'C' },
 	{ "todo",      no_argument,       NULL, '#' },
 	{ "version",   no_argument,       NULL, 'v' },
 	{ "help",      no_argument,       NULL, 'h' },
@@ -121,7 +124,7 @@ int main(int argc, char *argv[])
 		struct sockaddr_un addr;
 
 		opt = getopt_long(argc, argv,
-					"r:w:a:s:p:i:d:B:V:MNtTSAE:PJ:R:vh",
+					"r:w:a:s:p:i:d:B:V:MNtTSAE:PJ:R:C:vh",
 					main_options, NULL);
 		if (opt < 0)
 			break;
@@ -205,6 +208,9 @@ int main(int argc, char *argv[])
 		case 'R':
 			rtt = optarg;
 			break;
+		case 'C':
+			set_default_pager_num_columns(atoi(optarg));
+			break;
 		case '#':
 			packet_todo();
 			lmp_todo();
-- 
2.29.2