FORTIFY_SOURCE: add fgets support.
Change-Id: I8c3410a90c71a3336c4ac8581618fa9330edf5e3
diff --git a/libc/stdio/__fgets_chk.c b/libc/stdio/__fgets_chk.c
new file mode 100644
index 0000000..19123b9
--- /dev/null
+++ b/libc/stdio/__fgets_chk.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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 <stdio.h>
+#include <stdlib.h>
+#include <private/logd.h>
+
+/*
+ * __fgets_chk. Called in place of fgets() when we know the
+ * size of the buffer we're writing into.
+ *
+ * See
+ * http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
+ * for details.
+ *
+ * This fgets check is called if _FORTIFY_SOURCE is defined and
+ * greater than 0.
+ */
+char *__fgets_chk(char *dest, int supplied_size,
+ FILE *stream, size_t dest_len_from_compiler)
+{
+ if (supplied_size < 0) {
+ __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+ "*** fgets buffer size less than 0 ***\n");
+ abort();
+ }
+
+ if (((size_t) supplied_size) > dest_len_from_compiler) {
+ __libc_android_log_print(ANDROID_LOG_FATAL, "libc",
+ "*** fgets buffer overflow detected ***\n");
+ abort();
+ }
+
+ return fgets(dest, supplied_size, stream);
+}