Gary-Hobson commented on code in PR #8755:
URL: https://github.com/apache/nuttx/pull/8755#discussion_r1133464231
##########
drivers/syslog/ramlog.c:
##########
@@ -286,84 +296,42 @@ static int ramlog_addchar(FAR struct ramlog_dev_s *priv,
char ch)
flags = enter_critical_section();
- /* Calculate the write index AFTER the next byte is written */
-
- nexthead = priv->rl_head + 1;
- if (nexthead >= priv->rl_bufsize)
- {
- nexthead = 0;
- }
+ /* Calculate the size in the buffer */
- /* Would the next write overflow the circular buffer? */
+ space = (int)priv->rl_head - (int)priv->rl_tail >= 0 ?
+ priv->rl_bufsize - (priv->rl_head - priv->rl_tail) - 1:
+ priv->rl_tail - priv->rl_head - 1;
- if (nexthead == priv->rl_tail)
+ if (len > space)
{
#ifdef CONFIG_RAMLOG_OVERWRITE
- /* Yes... Overwrite with the latest log in the circular buffer */
-
- priv->rl_buffer[priv->rl_tail] = '\0';
- priv->rl_tail += 1;
- if (priv->rl_tail >= priv->rl_bufsize)
- {
- priv->rl_tail = 0;
- }
+ priv->rl_tail = (priv->rl_tail + len - space) % priv->rl_bufsize;
#else
- /* Yes... Return an indication that nothing was saved in the buffer. */
-
- leave_critical_section(flags);
- return -EBUSY;
+ len = space;
#endif
}
- /* No... copy the byte and re-enable interrupts */
-
- priv->rl_buffer[priv->rl_head] = ch;
- priv->rl_head = nexthead;
-
- leave_critical_section(flags);
- return OK;
-}
-
-/****************************************************************************
- * Name: ramlog_addbuf
- ****************************************************************************/
-
-static ssize_t ramlog_addbuf(FAR struct ramlog_dev_s *priv,
- FAR const char *buffer, size_t len)
-{
- int readers_waken;
- ssize_t nwritten;
- char ch;
- int ret;
-
- ret = nxmutex_lock(&priv->rl_lock);
- if (ret < 0)
+ head = priv->rl_head;
+ if (priv->rl_head + len > priv->rl_bufsize)
{
- return ret;
+ remain = priv->rl_bufsize - priv->rl_head;
+ priv->rl_head = priv->rl_head + len - priv->rl_bufsize;
}
-
- for (nwritten = 0; (size_t)nwritten < len; nwritten++)
+ else
{
- /* Get the next character to output */
-
- ch = buffer[nwritten];
-
- /* Then output the character */
+ remain = len;
+ priv->rl_head = priv->rl_head + len;
+ }
- ret = ramlog_addchar(priv, ch);
- if (ret < 0)
- {
- /* The buffer is full and nothing was saved. The remaining
- * data to be written is dropped on the floor.
- */
+ /* No... copy the byte and re-enable interrupts */
- break;
- }
- }
+ leave_critical_section(flags);
Review Comment:
done
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