1 files changed, 69 insertions, 0 deletions
diff --git a/libpe/libpe_utils.c b/libpe/libpe_utils.c
new file mode 100644
index 0000000..9bc9a54
--- /dev/null
+++ b/libpe/libpe_utils.c
@@ -0,0 +1,69 @@
+/*-
+ * Copyright (c) 2016 Kai Wang
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "_libpe.h"
+
+ELFTC_VCSID("$Id: libpe_utils.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
+
+off_t
+libpe_align(PE *pe, off_t off, size_t align)
+{
+	off_t n;
+
+	assert(align > 0 && (align & (align - 1)) == 0);
+
+	n = roundup(off, align);
+	if (n > off) {
+		if (libpe_pad(pe, n - off) < 0)
+			return (-1);
+	}
+
+	return (n);
+}
+
+int
+libpe_pad(PE *pe, size_t pad)
+{
+	char tmp[128];
+	size_t s;
+
+	memset(tmp, 0, sizeof(tmp));
+	for (; pad > 0; pad -= s) {
+		s = pad > sizeof(tmp) ? sizeof(tmp) : pad;
+		if (write(pe->pe_fd, tmp, s) != (ssize_t) s) {
+			errno = EIO;
+			return (-1);
+		}
+	}
+
+	return (0);
+}