diff --git a/buffer.c b/buffer.c
index d8ba6fb..f7bf469 100644
--- a/buffer.c
+++ b/buffer.c
@@ -20,6 +20,8 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
 #include "error.h"
 #include "buffer.h"
 
@@ -99,3 +101,17 @@ void buffer_append(struct buffer *b, const void *ptr, size_t len) {
 	memcpy(b->block + b->len, ptr, len);
 	buffer_setlen(b, b->len + len);
 }
+
+int buffer_write(struct buffer *b, const char *filename) {
+
+	int fd, rc;
+
+	fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0664);
+	if (fd < 0)
+		return error("%s: %s", filename, strerror(errno));
+
+	rc = write(fd, b->block, b->len);
+	close(fd);
+
+	return rc;
+}
diff --git a/buffer.h b/buffer.h
index 034bf77..c365e83 100644
--- a/buffer.h
+++ b/buffer.h
@@ -95,4 +95,6 @@ static inline void buffer_str_term(struct buffer *b, char ch) {
 		buffer_append_ch(b, ch);
 }
 
+int buffer_write(struct buffer *b, const char *filename);
+
 #endif /* BUFFER_H */