pkarashchenko commented on a change in pull request #5408:
URL: https://github.com/apache/incubator-nuttx/pull/5408#discussion_r799300983
##########
File path: drivers/syslog/syslog_device.c
##########
@@ -451,38 +451,58 @@ static ssize_t syslog_dev_write(FAR struct
syslog_channel_s *channel,
if (*endptr == '\r' || *endptr == '\n')
{
+ /* Write everything up to the position of the special
+ * character.
+ *
+ * - buffer points to next byte to output.
+ * - endptr points to the special character.
+ */
+
+ writelen = (size_t)((uintptr_t)endptr - (uintptr_t)buffer);
+ if (writelen > 0)
+ {
+ nwritten = file_write(&syslog_dev->sl_file,
+ buffer, writelen);
+ if (nwritten < 0)
+ {
+ ret = (int)nwritten;
+ goto errout_with_sem;
+ }
+ }
+
/* Check for pre-formatted CR-LF sequence */
if (remaining > 1 &&
((endptr[0] == '\r' && endptr[1] == '\n') ||
(endptr[0] == '\n' && endptr[1] == '\r')))
{
- /* Just skip over pre-formatted CR-LF or LF-CR sequence */
+ nwritten = file_write(&syslog_dev->sl_file,
+ g_syscrlf, 2);
- endptr++;
- remaining--;
- }
- else
- {
- /* Write everything up to the position of the special
- * character.
- *
- * - buffer points to next byte to output.
- * - endptr points to the special character.
+ /* Synchronize the file when each CR-LF is encountered
+ * (i.e., implements line buffering always).
*/
- writelen = (size_t)((uintptr_t)endptr - (uintptr_t)buffer);
- if (writelen > 0)
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+ if (nwritten > 0)
{
- nwritten = file_write(&syslog_dev->sl_file,
- buffer, writelen);
- if (nwritten < 0)
- {
- ret = (int)nwritten;
- goto errout_with_sem;
- }
+ syslog_dev_flush(channel);
Review comment:
I do not see how this can be done. The `nwritten =
file_write(&syslog_dev->sl_file, g_syscrlf, 2);` should be called either in
case of `if (remaining > 1 && ((endptr[0] == '\r' && endptr[1] == '\n') ||
(endptr[0] == '\n' && endptr[1] == '\r')))` or in case of `if (*endptr ==
'\n')`, but not for `if (*endptr == '\r')`. Also `endptr++;` and `remaining--;`
should be done only if we are having pre-formatted CR-LF sequence.
If you can come with a suggestion, then I will analyze and integrate it into
this PR
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