53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
|
/* Variable-sized buffer with on-stack default allocation.
|
||
|
|
Copyright (C) 2015 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 <scratch_buffer.h>
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
bool
|
||
|
|
__libc_scratch_buffer_grow (struct scratch_buffer *buffer)
|
||
|
|
{
|
||
|
|
void *new_ptr;
|
||
|
|
size_t new_length = buffer->length * 2;
|
||
|
|
|
||
|
|
/* Discard old buffer. */
|
||
|
|
scratch_buffer_free (buffer);
|
||
|
|
|
||
|
|
/* Check for overflow. */
|
||
|
|
if (__glibc_likely (new_length >= buffer->length))
|
||
|
|
new_ptr = malloc (new_length);
|
||
|
|
else
|
||
|
|
{
|
||
|
|
__set_errno (ENOMEM);
|
||
|
|
new_ptr = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (__glibc_unlikely (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_grow);
|