Add tiny blob wrapper, holding ptr+size, optimized to grow and reset

1 files changed, 41 insertions, 0 deletions

diff --git a/ot_buf.c b/ot_buf.c
new file mode 100644
index 0000000..eb00edf
--- /dev/null
+++ b/ot_buf.c
@@ -0,0 +1,41 @@
+/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
+   It is considered beerware. Prost. Skol. Cheers or whatever.
+
+   $id$ */
+
+/* System */
+#include <stdlib.h>
+#include <string.h>
+
+/* Opentracker */
+#include "ot_buf.h"
+
+int buf_cat(ot_buf *buf, const void *src, size_t len) {
+  char *data;
+
+  if (!len)
+    return 0;
+
+  if (buf->size + len < buf->size)
+    return -1;
+
+  if (!(data = realloc(buf->data, buf->size + len)))
+    return -1;
+
+  buf->data = data;
+  memcpy(data + buf->size, src, len);
+  buf->size += len;
+
+  return 0;
+}
+
+void buf_truncate(ot_buf *buf, size_t len) {
+  if (len < buf->size)
+    buf->size = len;
+}
+
+void buf_reset(ot_buf *buf) {
+  free(buf->data);
+  buf->data = NULL;
+  buf->size = 0;
+}