1 files changed, 85 insertions, 0 deletions
diff --git a/libnetdata/circular_buffer/circular_buffer.c b/libnetdata/circular_buffer/circular_buffer.c
new file mode 100644
index 000000000..998008db2
--- /dev/null
+++ b/libnetdata/circular_buffer/circular_buffer.c
@@ -0,0 +1,85 @@
+#include "../libnetdata.h"
+
+struct circular_buffer *cbuffer_new(size_t initial, size_t max) {
+    struct circular_buffer *result = mallocz(sizeof(*result));
+    result->size = initial;
+    result->data = mallocz(initial);
+    result->write = 0;
+    result->read = 0;
+    result->max_size = max;
+    return result;
+}
+
+void cbuffer_free(struct circular_buffer *buf) {
+    freez(buf->data);
+    freez(buf);
+}
+
+static int cbuffer_realloc_unsafe(struct circular_buffer *buf) {
+    // Check that we can grow
+    if (buf->size >= buf->max_size)
+        return 1;
+    size_t new_size = buf->size * 2;
+    if (new_size > buf->max_size)
+        new_size = buf->max_size;
+
+    // We know that: size < new_size <= max_size
+    // For simplicity align the current data at the bottom of the new buffer
+    char *new_data = mallocz(new_size);
+    if (buf->read == buf->write)
+        buf->write = 0; // buffer is empty
+    else if (buf->read < buf->write) {
+        memcpy(new_data, buf->data + buf->read, buf->write - buf->read);
+        buf->write -= buf->read;
+    } else {
+        size_t top_part = buf->size - buf->read;
+        memcpy(new_data, buf->data + buf->read, top_part);
+        memcpy(new_data + top_part, buf->data, buf->write);
+        buf->write = top_part + buf->write;
+    }
+    buf->read = 0;
+
+    // Switch buffers
+    freez(buf->data);
+    buf->data = new_data;
+    buf->size = new_size;
+    return 0;
+}
+
+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) {
+        if (cbuffer_realloc_unsafe(buf)) {
+            return 1;
+        }
+    }
+    // Guarantee: write + d_len cannot hit read
+    if (buf->write + d_len < buf->size) {
+        memcpy(buf->data + buf->write, d, d_len);
+        buf->write += d_len;
+    }
+    else {
+        size_t top_part = buf->size - buf->write;
+        memcpy(buf->data + buf->write, d, top_part);
+        memcpy(buf->data, d + top_part, d_len - top_part); 
+        buf->write = d_len - top_part;
+    }
+    return 0;
+}
+
+// Assume caller does not remove too many bytes (i.e. read will jump over write)
+void cbuffer_remove_unsafe(struct circular_buffer *buf, size_t num) {
+    buf->read += num;
+    // Assume num < size (i.e. caller cannot remove more bytes than are in the buffer)
+    if (buf->read >= buf->size)
+        buf->read -= buf->size;
+}
+
+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;
+}