mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* Variable-sized buffer with on-stack default allocation.
|
|
Copyright (C) 2015-2022 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _LIBC
|
|
# include <libc-config.h>
|
|
#endif
|
|
|
|
#include <scratch_buffer.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
|
|
bool
|
|
__libc_scratch_buffer_set_array_size (struct scratch_buffer *buffer,
|
|
size_t nelem, size_t size)
|
|
{
|
|
size_t new_length = nelem * size;
|
|
|
|
/* Avoid overflow check if both values are small. */
|
|
if ((nelem | size) >> (sizeof (size_t) * CHAR_BIT / 2) != 0
|
|
&& nelem != 0 && size != new_length / nelem)
|
|
{
|
|
/* Overflow. Discard the old buffer, but it must remain valid
|
|
to free. */
|
|
scratch_buffer_free (buffer);
|
|
scratch_buffer_init (buffer);
|
|
__set_errno (ENOMEM);
|
|
return false;
|
|
}
|
|
|
|
if (new_length <= buffer->length)
|
|
return true;
|
|
|
|
/* Discard old buffer. */
|
|
scratch_buffer_free (buffer);
|
|
|
|
char *new_ptr = malloc (new_length);
|
|
if (new_ptr == NULL)
|
|
{
|
|
/* Buffer must remain valid to free. */
|
|
scratch_buffer_init (buffer);
|
|
return false;
|
|
}
|
|
|
|
/* Install new heap-based buffer. */
|
|
buffer->data = new_ptr;
|
|
buffer->length = new_length;
|
|
return true;
|
|
}
|
|
libc_hidden_def (__libc_scratch_buffer_set_array_size)
|