/**
* virExpandN:
* @ptrptr: pointer to pointer for address of allocated memory
* @size: number of bytes per element
* @countptr: pointer to number of elements in array
* @add: number of elements to add
* @report: whether to report OOM error, if there is one
* @domcode: error domain code
* @filename: caller's filename
* @funcname: caller's funcname
* @linenr: caller's line number
*
* Resize the block of memory in 'ptrptr' to be an array of
* '*countptr' + 'add' elements, each 'size' bytes in length.
* Update 'ptrptr' and 'countptr' with the details of the newly
* allocated memory. On failure, 'ptrptr' and 'countptr' are not
* changed. Any newly allocated memory in 'ptrptr' is zero-filled.
* If @report is true, OOM errors are reported automatically.
*
* Returns -1 on failure to allocate, zero on success
*/
int virExpandN(void *ptrptr,
size_t size,
size_t *countptr,
size_t add,
bool report,
int domcode,
const char *filename,
const char *funcname,
size_t linenr)
{
int ret;
if (*countptr + add < *countptr) {
if (report)
virReportOOMErrorFull(domcode, filename, funcname, linenr);
errno = ENOMEM;
return -1;
}
ret = virReallocN(ptrptr, size, *countptr + add, report,
domcode, filename, funcname, linenr);
if (ret == 0) {
memset(*(char **)ptrptr + (size * *countptr), 0, size * add);
*countptr += add;
}
return ret;
}
/**
* virShrinkN:
* @ptrptr: pointer to pointer for address of allocated memory
* @size: number of bytes per element
* @countptr: pointer to number of elements in array
* @toremove: number of elements to remove
*
* Resize the block of memory in 'ptrptr' to be an array of
* '*countptr' - 'toremove' elements, each 'size' bytes in length.
* Update 'ptrptr' and 'countptr' with the details of the newly
* allocated memory. If 'toremove' is larger than 'countptr', free
* the entire array.
*/
void virShrinkN(void *ptrptr, size_t size, size_t *countptr, size_t toremove)
{
if (toremove < *countptr)
ignore_value(virReallocN(ptrptr, size, *countptr -= toremove));
else {
virFree(ptrptr);
*countptr = 0;
}
}
/**
* virExpandN:
* @ptrptr: pointer to pointer for address of allocated memory
* @size: number of bytes per element
* @countptr: pointer to number of elements in array
* @add: number of elements to add
*
* Resize the block of memory in 'ptrptr' to be an array of
* '*countptr' + 'add' elements, each 'size' bytes in length.
* Update 'ptrptr' and 'countptr' with the details of the newly
* allocated memory. On failure, 'ptrptr' and 'countptr' are not
* changed. Any newly allocated memory in 'ptrptr' is zero-filled.
*
* Returns -1 on failure to allocate, zero on success
*/
int virExpandN(void *ptrptr, size_t size, size_t *countptr, size_t add)
{
int ret;
if (*countptr + add < *countptr) {
errno = ENOMEM;
return -1;
}
ret = virReallocN(ptrptr, size, *countptr + add);
if (ret == 0) {
memset(*(char **)ptrptr + (size * *countptr), 0, size * add);
*countptr += add;
}
return ret;
}