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author | Florian Weimer <fweimer@redhat.com> | 2017-06-21 22:43:57 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2017-06-21 22:43:57 +0200 |
commit | 4dd8e7c0ce5ecc7f65e33e60ad2f717b31de32ec (patch) | |
tree | bfc9688f34dfc949e8da77d0ec05b684ff64e86f /malloc/alloc_buffer_copy_bytes.c | |
parent | 11ffcacb64a939c10cfc713746b8ec88837f5c4a (diff) | |
download | glibc-4dd8e7c0ce5ecc7f65e33e60ad2f717b31de32ec.tar.gz glibc-4dd8e7c0ce5ecc7f65e33e60ad2f717b31de32ec.tar.xz glibc-4dd8e7c0ce5ecc7f65e33e60ad2f717b31de32ec.zip |
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).
Diffstat (limited to 'malloc/alloc_buffer_copy_bytes.c')
-rw-r--r-- | malloc/alloc_buffer_copy_bytes.c | 34 |
1 files changed, 34 insertions, 0 deletions
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 + <http://www.gnu.org/licenses/>. */ + +#include <alloc_buffer.h> + +#include <string.h> + +/* 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) |