static inline int pf_check_auto_grow(pf_output *out, unsigned delta)
{
if (pf_is_auto_grow(out) && out->used + delta > out->len)
{
out->len = max(out->len * 2, out->used + delta);
if (out->unicode)
{
if (out->buf.W != out->grow.W)
out->buf.W = MSVCRT_realloc(out->buf.W, out->len * sizeof(WCHAR));
else
out->buf.W = MSVCRT_malloc(out->len * sizeof(WCHAR));
if (!out->buf.W) return -1;
}
else
{
if (out->buf.A != out->grow.A)
out->buf.A = MSVCRT_realloc(out->buf.A, out->len * sizeof(char));
else
out->buf.A = MSVCRT_malloc(out->len * sizeof(char));
if (!out->buf.A) return -1;
}
}
return 0;
}
/*********************************************************************
* _recalloc (MSVCR100.@)
*/
void* CDECL _recalloc(void *mem, MSVCRT_size_t num, MSVCRT_size_t size)
{
MSVCRT_size_t old_size;
void *ret;
if(!mem)
return MSVCRT_calloc(num, size);
size = num*size;
old_size = _msize(mem);
ret = MSVCRT_realloc(mem, size);
if(!ret) {
*MSVCRT__errno() = MSVCRT_ENOMEM;
return NULL;
}
if(size>old_size)
memset((BYTE*)ret+old_size, 0, size-old_size);
return ret;
}
/*********************************************************************
* _aligned_offset_realloc (MSVCRT.@)
*/
void * CDECL _aligned_offset_realloc(void *memblock, MSVCRT_size_t size,
MSVCRT_size_t alignment, MSVCRT_size_t offset)
{
void * temp, **saved;
MSVCRT_size_t old_padding, new_padding, old_size;
TRACE("(%p, %lu, %lu, %lu)\n", memblock, size, alignment, offset);
if (!memblock)
return _aligned_offset_malloc(size, alignment, offset);
/* alignment must be a power of 2 */
if ((alignment & (alignment - 1)) != 0)
{
*MSVCRT__errno() = MSVCRT_EINVAL;
return NULL;
}
/* offset must be less than size */
if (offset >= size)
{
*MSVCRT__errno() = MSVCRT_EINVAL;
return NULL;
}
if (size == 0)
{
_aligned_free(memblock);
return NULL;
}
/* don't align to less than void pointer size */
if (alignment < sizeof(void *))
alignment = sizeof(void *);
/* make sure alignment and offset didn't change */
saved = SAVED_PTR(memblock);
if (memblock != ALIGN_PTR(*saved, alignment, offset))
{
*MSVCRT__errno() = MSVCRT_EINVAL;
return NULL;
}
old_padding = (char *)memblock - (char *)*saved;
/* Get previous size of block */
old_size = _msize(*saved);
if (old_size == -1)
{
/* It seems this function was called with an invalid pointer. Bail out. */
return NULL;
}
/* Adjust old_size to get amount of actual data in old block. */
if (old_size < old_padding)
{
/* Shouldn't happen. Something's weird, so bail out. */
return NULL;
}
old_size -= old_padding;
temp = MSVCRT_realloc(*saved, size + alignment + sizeof(void *));
if (!temp)
return NULL;
/* adjust pointer for proper alignment and offset */
memblock = ALIGN_PTR(temp, alignment, offset);
/* Save the real allocation address below returned address */
/* so it can be found later to free. */
saved = SAVED_PTR(memblock);
new_padding = (char *)memblock - (char *)temp;
/*
Memory layout of old block is as follows:
+-------+---------------------+-+--------------------------+-----------+
| ... | "old_padding" bytes | | ... "old_size" bytes ... | ... |
+-------+---------------------+-+--------------------------+-----------+
^ ^ ^
| | |
*saved saved memblock
Memory layout of new block is as follows:
+-------+-----------------------------+-+----------------------+-------+
| ... | "new_padding" bytes | | ... "size" bytes ... | ... |
+-------+-----------------------------+-+----------------------+-------+
^ ^ ^
| | |
temp saved memblock
However, in the new block, actual data is still written as follows
(because it was copied by MSVCRT_realloc):
+-------+---------------------+--------------------------------+-------+
| ... | "old_padding" bytes | ... "old_size" bytes ... | ... |
+-------+---------------------+--------------------------------+-------+
^ ^ ^
| | |
temp saved memblock
Therefore, min(old_size,size) bytes of actual data have to be moved
from the offset they were at in the old block (temp + old_padding),
to the offset they have to be in the new block (temp + new_padding == memblock).
*/
if (new_padding != old_padding)
memmove((char *)memblock, (char *)temp + old_padding, (old_size < size) ? old_size : size);
*saved = temp;
return memblock;
}
