Merging upstream version 1.37.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

2 files changed, 19 insertions, 5 deletions

diff --git a/libnetdata/circular_buffer/circular_buffer.c b/libnetdata/circular_buffer/circular_buffer.c
index 998008db2..c791b420b 100644
--- a/libnetdata/circular_buffer/circular_buffer.c
+++ b/libnetdata/circular_buffer/circular_buffer.c
@@ -46,6 +46,11 @@ static int cbuffer_realloc_unsafe(struct circular_buffer *buf) {
     return 0;
 }
 
+size_t cbuffer_available_size_unsafe(struct circular_buffer *buf) {
+    size_t len = (buf->write >= buf->read) ? (buf->write - buf->read) : (buf->size - buf->read + buf->write);
+    return buf->max_size - len;
+}
+
 int cbuffer_add_unsafe(struct circular_buffer *buf, const char *d, size_t d_len) {
     size_t len = (buf->write >= buf->read) ? (buf->write - buf->read) : (buf->size - buf->read + buf->write);
     while (d_len + len >= buf->size) {
@@ -78,8 +83,14 @@ void cbuffer_remove_unsafe(struct circular_buffer *buf, size_t num) {
 size_t cbuffer_next_unsafe(struct circular_buffer *buf, char **start) {
     if (start != NULL)
       *start = buf->data + buf->read;
+
     if (buf->read <= buf->write) {
         return buf->write - buf->read;      // Includes empty case
     }
     return buf->size - buf->read;
 }
+
+void cbuffer_flush(struct circular_buffer*buf) {
+    buf->write = 0;
+    buf->read = 0;
+}
\ No newline at end of file
diff --git a/libnetdata/circular_buffer/circular_buffer.h b/libnetdata/circular_buffer/circular_buffer.h
index ba37e0ebf..8c42aa807 100644
--- a/libnetdata/circular_buffer/circular_buffer.h
+++ b/libnetdata/circular_buffer/circular_buffer.h
@@ -8,9 +8,12 @@ struct circular_buffer {
     char *data;
 };
 
-extern struct circular_buffer *cbuffer_new(size_t initial, size_t max);
-extern void cbuffer_free(struct circular_buffer *buf);
-extern int cbuffer_add_unsafe(struct circular_buffer *buf, const char *d, size_t d_len);
-extern void cbuffer_remove_unsafe(struct circular_buffer *buf, size_t num);
-extern size_t cbuffer_next_unsafe(struct circular_buffer *buf, char **start);
+struct circular_buffer *cbuffer_new(size_t initial, size_t max);
+void cbuffer_free(struct circular_buffer *buf);
+int cbuffer_add_unsafe(struct circular_buffer *buf, const char *d, size_t d_len);
+void cbuffer_remove_unsafe(struct circular_buffer *buf, size_t num);
+size_t cbuffer_next_unsafe(struct circular_buffer *buf, char **start);
+size_t cbuffer_available_size_unsafe(struct circular_buffer *buf);
+void cbuffer_flush(struct circular_buffer*buf);
+
 #endif