Function ws_volume_prefix_len

src/foundation/workspace.c:35–62

Length of the volume prefix: "/" on POSIX, "C:/" for a drive, "//srv/share" * for a UNC share. Returns 0 when the path is not absolute. */

/* Length of the volume prefix: "/" on POSIX, "C:/" for a drive, "//srv/share"
 * for a UNC share. Returns 0 when the path is not absolute. */
static size_t ws_volume_prefix_len(const char *path) {
    if (!path || !path[0]) {
        return 0;
    }
    /* UNC: two separators, a host, then a share. */
    if (ws_is_sep(path[0]) && ws_is_sep(path[1])) {
        size_t i = 2;
        while (path[i] && !ws_is_sep(path[i])) { /* host */
            i++;
        }
        while (ws_is_sep(path[i])) {
            i++;
        }
        while (path[i] && !ws_is_sep(path[i])) { /* share */
            i++;
        }
        return i;
    }
    if (ws_is_sep(path[0])) {
        return 1;
    }
    /* Drive-letter root, with or without a trailing separator. */
    if (path[1] == ':' &&
        ((path[0] >= 'A' && path[0] <= 'Z') || (path[0] >= 'a' && path[0] <= 'z'))) {
        return ws_is_sep(path[2]) ? 3 : 2;
    }
    return 0;
}

static bool ws_is_unc(const char *path) {
    return path && ws_is_sep(path[0]) && ws_is_sep(path[1]);