altos: Create the log file if it doesn't already exist

open will return failure unless the file already exists.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 18 insertions, 7 deletions

diff --git a/src/drivers/ao_log_fat.c b/src/drivers/ao_log_fat.c
index 684148b7..2741555f 100644
--- a/src/drivers/ao_log_fat.c
+++ b/src/drivers/ao_log_fat.c
@@ -20,23 +20,34 @@
 #include "ao_fat.h"
 
 static uint8_t	log_year, log_month, log_day;
-static uint8_t	log_running;
+static uint8_t	log_open;
 static uint8_t	log_mutex;
 
 static void
 ao_log_open(void)
 {
 	char	name[12];
+	int8_t	status;
 
 	sprintf(name,"%04d%02d%02dLOG", 2000 + log_year, log_month, log_day);
-	if (ao_fat_open(name, AO_FAT_OPEN_WRITE) == AO_FAT_SUCCESS)
-		log_running = 1;
+	status = ao_fat_open(name, AO_FAT_OPEN_WRITE);
+	switch (status) {
+	case AO_FAT_SUCCESS:
+		ao_fat_seek(0, AO_FAT_SEEK_END);
+		log_open = 1;
+		break;
+	case -AO_FAT_ENOENT:
+		status = ao_fat_creat(name);
+		if (status == AO_FAT_SUCCESS)
+			log_open = 1;
+		break;
+	} 
 }
 
 static void
 ao_log_close(void)
 {
-	log_running = 0;
+	log_open = 0;
 	ao_fat_close();
 }
 
@@ -52,20 +63,20 @@ ao_log_mega(struct ao_log_mega *log)
 	uint8_t	wrote = 0;
 	ao_mutex_get(&log_mutex);
 	if (log->type == AO_LOG_GPS_TIME) {
-		if (log_running &&
+		if (log_open &&
 		    (log_year != log->u.gps.year ||
 		     log_month != log->u.gps.month ||
 		     log_day != log->u.gps.day)) {
 			ao_log_close();
 		}
-		if (!log_running) {
+		if (!log_open) {
 			log_year = log->u.gps.year;
 			log_month = log->u.gps.month;
 			log_day = log->u.gps.day;
 			ao_log_open();
 		}
 	}
-	if (log_running) {
+	if (log_open) {
 		wrote = ao_fat_write(log, sizeof (*log)) == AO_FAT_SUCCESS;
 		ao_fat_sync();
 	}