int ffurl_alloc(URLContext **puc, const char *filename, int flags, const AVIOInterruptCB *int_cb) { URLProtocol *up = NULL; char proto_str[128], proto_nested[128], *ptr; size_t proto_len = strspn(filename, URL_SCHEME_CHARS); if (filename[proto_len] != ':' || is_dos_path(filename)) strcpy(proto_str, "file"); else av_strlcpy(proto_str, filename, FFMIN(proto_len + 1, sizeof(proto_str))); av_strlcpy(proto_nested, proto_str, sizeof(proto_nested)); if ((ptr = strchr(proto_nested, '+'))) *ptr = '\0'; while (up = ffurl_protocol_next(up)) { if (!strcmp(proto_str, up->name)) return url_alloc_for_protocol(puc, up, filename, flags, int_cb); if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME && !strcmp(proto_nested, up->name)) return url_alloc_for_protocol(puc, up, filename, flags, int_cb); } *puc = NULL; return AVERROR_PROTOCOL_NOT_FOUND; }