From 4dd8e7c0ce5ecc7f65e33e60ad2f717b31de32ec Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Wed, 21 Jun 2017 22:43:57 +0200 Subject: Implement allocation buffers for internal use This commit adds fixed-size allocation buffers. The primary use case is in NSS modules, where dynamically sized data is stored in a fixed-size buffer provided by the caller. Other uses include a replacement of mempcpy cascades (which is safer due to the size checking inherent to allocation buffers). --- malloc/alloc_buffer_copy_bytes.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 malloc/alloc_buffer_copy_bytes.c (limited to 'malloc/alloc_buffer_copy_bytes.c') diff --git a/malloc/alloc_buffer_copy_bytes.c b/malloc/alloc_buffer_copy_bytes.c new file mode 100644 index 0000000000..66196f1520 --- /dev/null +++ b/malloc/alloc_buffer_copy_bytes.c @@ -0,0 +1,34 @@ +/* Copy an array of bytes into the buffer. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +#include + +/* This function works on a copy of the buffer object, so that it can + remain non-addressable in the caller. */ +struct alloc_buffer +__libc_alloc_buffer_copy_bytes (struct alloc_buffer buf, + const void *src, size_t len) +{ + void *ptr = alloc_buffer_alloc_bytes (&buf, len); + if (ptr != NULL) + memcpy (ptr, src, len); + return buf; +} +libc_hidden_def (__libc_alloc_buffer_copy_bytes) -- cgit v1.2.3-70-g09d2