Unexpected behavior of curl_url_set for empty string (DEBUGASSERT)

[ad0p]

I did this

I am trying to use curl_url_set with CURLU_DEFAULT_SCHEME option to validate a string and check whether it's a valid URL.

Now, our tests fail when calling curl_url_set on empty string with DEBUGBUILD.

It fails on urlapi.c:1245

DEBUGASSERT(pathlen < urllen);

With release build, it returns CURLUE_OK

Is it expected for empty string URL to fail here and just for DEBUGBUILD?

I expected the following

Release build says that empty string is a valid URL, debug build fails on assertion. I would expect the same behavior in both.

curl/libcurl version

curl 8.2.1

operating system

not relevant

[bagder]

Setting a blank URL does not assert for me.

It should return an error.

#include <curl/curl.h>

int main(void)
{
  curl_global_init(CURL_GLOBAL_ALL);
  CURLU *u = curl_url();
  curl_url_set(u, CURLUPART_URL, "", 0);
  curl_global_cleanup();
}

[ad0p]

I apologize, I forgot to mention that we use curl_url_set with CURLU_DEFAULT_SCHEME option... you are right, without this flag, behavior is different.

[bagder]

#11715 now makes this return CURLUE_MALFORMED_INPUT