1 files changed, 40 insertions, 0 deletions
diff --git a/src/lib/read-full.c b/src/lib/read-full.c
new file mode 100644
index 0000000..733c3df
--- /dev/null
+++ b/src/lib/read-full.c
@@ -0,0 +1,40 @@
+/* Copyright (c) 2003-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "read-full.h"
+
+#include <unistd.h>
+
+int read_full(int fd, void *data, size_t size)
+{
+	ssize_t ret;
+
+	while (size > 0) {
+		ret = read(fd, data, size < SSIZE_T_MAX ? size : SSIZE_T_MAX);
+		if (ret <= 0)
+			return ret;
+
+		data = PTR_OFFSET(data, ret);
+		size -= ret;
+	}
+
+	return 1;
+}
+
+int pread_full(int fd, void *data, size_t size, off_t offset)
+{
+	ssize_t ret;
+
+	while (size > 0) {
+		ret = pread(fd, data, size < SSIZE_T_MAX ?
+			    size : SSIZE_T_MAX, offset);
+		if (ret <= 0)
+			return ret;
+
+		data = PTR_OFFSET(data, ret);
+		size -= ret;
+		offset += ret;
+	}
+
+	return 1;
+}