1 files changed, 84 insertions, 0 deletions
diff --git a/libinstaller/syslxrw.c b/libinstaller/syslxrw.c
new file mode 100644
index 00000000..86876e8c
--- /dev/null
+++ b/libinstaller/syslxrw.c
@@ -0,0 +1,84 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2010 Intel Corp. - All Rights Reserved
+ *   Copyright 2015 Paulo Alcantara <pcacjr@zytor.com>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ *   Boston MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "syslxrw.h"
+
+static void die(const char *msg)
+{
+    fputs(msg, stderr);
+    exit(1);
+}
+
+/*
+ * read/write wrapper functions
+ */
+ssize_t xpread(int fd, void *buf, size_t count, off_t offset)
+{
+    char *bufp = (char *)buf;
+    ssize_t rv;
+    ssize_t done = 0;
+
+    while (count) {
+	rv = pread(fd, bufp, count, offset);
+	if (rv == 0) {
+	    die("short read");
+	} else if (rv == -1) {
+	    if (errno == EINTR) {
+		continue;
+	    } else {
+		die(strerror(errno));
+	    }
+	} else {
+	    bufp += rv;
+	    offset += rv;
+	    done += rv;
+	    count -= rv;
+	}
+    }
+
+    return done;
+}
+
+ssize_t xpwrite(int fd, const void *buf, size_t count, off_t offset)
+{
+    const char *bufp = (const char *)buf;
+    ssize_t rv;
+    ssize_t done = 0;
+
+    while (count) {
+	rv = pwrite(fd, bufp, count, offset);
+	if (rv == 0) {
+	    die("short write");
+	} else if (rv == -1) {
+	    if (errno == EINTR) {
+		continue;
+	    } else {
+		die(strerror(errno));
+	    }
+	} else {
+	    bufp += rv;
+	    offset += rv;
+	    done += rv;
+	    count -= rv;
+	}
+    }
+
+    return done;
+}