buffer: add buffer_content0 utility function

2 files changed, 9 insertions, 0 deletions

diff --git a/buffer.c b/buffer.c
index c0c626f..d8b01f7 100644
--- a/buffer.c
+++ b/buffer.c
@@ -103,3 +103,9 @@ size_t buffer_length(Buffer *buf) {
 const char *buffer_content(Buffer *buf) {
 	return buf->data;
 }
+
+const char *buffer_content0(Buffer *buf) {
+	if (buf->len == 0 || (buf->data[buf->len-1] != '\0' && !buffer_append(buf, "\0", 1)))
+		return "";
+	return buf->data;
+}
diff --git a/buffer.h b/buffer.h
index cef75f3..1c9f684 100644
--- a/buffer.h
+++ b/buffer.h
@@ -42,6 +42,9 @@ bool buffer_prepend0(Buffer*, const char *data);
 size_t buffer_length0(Buffer*);
 /* return length of a buffer including possible NUL byte */
 size_t buffer_length(Buffer*);
+/* pointer to buffer data, guaranteed to return a NUL terminated
+ * string even if buffer is empty */
+const char *buffer_content0(Buffer*);
 /* pointer to buffer data, might be NULL if empty, might not be NUL terminated */
 const char *buffer_content(Buffer*);