1 files changed, 38 insertions, 0 deletions
diff --git a/libbb/full_write.c b/libbb/full_write.c
new file mode 100644
index 000000000..bceac6de5
--- /dev/null
+++ b/libbb/full_write.c
@@ -0,0 +1,38 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include "libbb.h"
+
+/*
+ * Write all of the supplied buffer out to a file.
+ * This does multiple writes as necessary.
+ * Returns the amount written, or -1 on an error.
+ */
+ssize_t full_write(int fd, const void *buf, size_t len)
+{
+	ssize_t cc;
+	ssize_t total;
+
+	total = 0;
+
+	while (len) {
+		cc = safe_write(fd, buf, len);
+
+		if (cc < 0)
+			return cc;	/* write() returns -1 on failure. */
+
+		total += cc;
+		buf = ((const char *)buf) + cc;
+		len -= cc;
+	}
+
+	return total;
+}