Function xmlMemRealloc

ThirdParty/libxml2/vtklibxml2/xmlmemory.c:154–193

* xmlMemRealloc: * @ptr: the initial memory block pointer * @size: an int specifying the size in byte to allocate. * * a realloc() equivalent, with logging of the allocation info. * * Returns a pointer to the allocated area or NULL in case of lack of memory. */

 * Returns a pointer to the allocated area or NULL in case of lack of memory.
 */
void *
xmlMemRealloc(void *ptr, size_t size) {
    MEMHDR *p, *tmp;
    size_t oldSize;

    if (ptr == NULL)
        return(xmlMemMalloc(size));

    xmlInitParser();

    if (size > (MAX_SIZE_T - RESERVE_SIZE)) {
        fprintf(stderr, "xmlMemRealloc: Unsigned overflow\n");
        return(NULL);
    }

    p = CLIENT_2_HDR(ptr);
    if (p->mh_tag != MEMTAG) {
        fprintf(stderr, "xmlMemRealloc: Tag error\n");
        return(NULL);
    }
    oldSize = p->mh_size;
    p->mh_tag = ~MEMTAG;

    tmp = (MEMHDR *) realloc(p, RESERVE_SIZE + size);
    if (!tmp) {
        p->mh_tag = MEMTAG;
        fprintf(stderr, "xmlMemRealloc: Out of memory\n");
        return(NULL);
    }
    p = tmp;
    p->mh_tag = MEMTAG;
    p->mh_size = size;

    xmlMutexLock(&xmlMemMutex);
    debugMemSize -= oldSize;
    debugMemSize += size;
    xmlMutexUnlock(&xmlMemMutex);

    return(HDR_2_CLIENT(p));
}

/**
 * xmlMemFree: