Function xmlResolvePath

ThirdParty/libxml2/vtklibxml2/uri.c:1900–1991

* xmlResolvePath: * @ref: the filesystem path * @base: the base value * @out: pointer to result URI * * Resolves a filesystem path from a base path. * * Returns 0 on success, -1 if a memory allocation failed or an error * code if URI or base are invalid. */

 * code if URI or base are invalid.
 */
static int
xmlResolvePath(const xmlChar *escRef, const xmlChar *base, xmlChar **out) {
    const xmlChar *fragment;
    xmlChar *tmp = NULL;
    xmlChar *ref = NULL;
    xmlChar *result = NULL;
    int ret = -1;
    int i;

    if (out == NULL)
        return(1);
    *out = NULL;

    if ((escRef == NULL) || (escRef[0] == 0)) {
        if ((base == NULL) || (base[0] == 0))
            return(1);
        ref = xmlStrdup(base);
        if (ref == NULL)
            goto err_memory;
        *out = ref;
        return(0);
    }

    /*
     * If a URI is resolved, we can assume it is a valid URI and not
     * a filesystem path. This means we have to unescape the part
     * before the fragment.
     */
    fragment = xmlStrchr(escRef, '#');
    if (fragment != NULL) {
        tmp = xmlStrndup(escRef, fragment - escRef);
        if (tmp == NULL)
            goto err_memory;
        escRef = tmp;
    }

    ref = (xmlChar *) xmlURIUnescapeString((char *) escRef, -1, NULL);
    if (ref == NULL)
        goto err_memory;

    if ((base == NULL) || (base[0] == 0))
        goto done;

    if (xmlIsAbsolutePath(ref))
        goto done;

    /*
     * Remove last segment from base
     */
    i = xmlStrlen(base);
    while ((i > 0) && !xmlIsPathSeparator(base[i-1], 1))
        i--;

    /*
     * Concatenate base and ref
     */
    if (i > 0) {
        int refLen = xmlStrlen(ref);