[PATCH 02/14] common: console: add log_dprint to print to file descriptor

[Ahmad Fatoum]

It can be useful to dump the log into the file, e.g. when doing an
update from a USB flash drive with no serial peer attached. Board code
could use log_dprint to dump the log onto the drive. Add a function
to facilitate this.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 common/console_common.c | 15 +++++++++++++++
 include/printk.h        |  1 +
 2 files changed, 16 insertions(+)

diff --git a/common/console_common.c b/common/console_common.c
index 3e0741572398..77ad4728fbfd 100644
--- a/common/console_common.c
+++ b/common/console_common.c
@@ -182,6 +182,21 @@ static int console_common_init(void)
 }
 device_initcall(console_common_init);
 
+int log_dprint(int fd)
+{
+	struct log_entry *log;
+	int nbytes = 0;
+
+	list_for_each_entry(log, &barebox_logbuf, list) {
+		int ret = dputs(fd, log->msg);
+		if (ret < 0)
+			return ret;
+		nbytes += ret;
+	}
+
+	return nbytes;
+}
+
 void log_print(unsigned flags, unsigned levels)
 {
 	struct log_entry *log;
diff --git a/include/printk.h b/include/printk.h
index 94a25ec9ebac..798acfdbf188 100644
--- a/include/printk.h
+++ b/include/printk.h
@@ -141,6 +141,7 @@ extern void log_clean(unsigned int limit);
 #define BAREBOX_LOG_PRINT_ALERT		BIT(1)
 #define BAREBOX_LOG_PRINT_EMERG		BIT(0)
 
+int log_dprint(int fd);
 void log_print(unsigned flags, unsigned levels);
 
 struct va_format {
-- 
2.29.2