The previous use of snprintf() could make libcurl silently truncate some
input data and not report that back on overly large input, which could
make data get sent over the network in a bad format.

Example:

 $ curl --form 'a=b' -H "Content-Type: $(perl -e 'print "A"x4100')"

The subdirectory for logs in tests/ is named log/ without an 's'
at the end.

See #1054

The 'userp' argument is unused in this example code.

The error path would previously add a freed entry to the linked list.

Reported-by: Toby Peterson

Fixes #1053

Cokie with the same domain but different tailmatching property are now
considered different and do not replace each other.  If header contains
following lines then two cookies will be set: Set-Cookie: foo=bar;
domain=.foo.com; expires=Thu Mar 3 GMT 8:56:27 2033 Set-Cookie: foo=baz;
domain=foo.com; expires=Thu Mar 3 GMT 8:56:27 2033

This matches Chrome, Opera, Safari, and Firefox behavior. When sending
stored tokens to foo.com Chrome, Opera, Firefox store send them in the
stored order, while Safari pre-sort the cookies.

Closes #1050

Type required for YourClass::func C++ function (using size_t in line
with the documentation for CURLOPT_WRITEFUNCTION) and missing second
colon when specifying the static function for CURLOPT_WRITEFUNCTION.

Closes #1046

A libssh2 library in the standard system location was being used in
preference to the desired one while linking.

Add the new option CURLOPT_KEEP_SENDING_ON_ERROR to control whether
sending the request body shall be completed when the server responds
early with an error status code.

This is suitable for manual NTLM authentication.

Reviewed-by: Jay Satiro

Closes https://github.com/curl/curl/pull/904

As it seems to be a rarely used cipher suite (for securely established
but _unencrypted_ connections), I believe it is fine not to provide an
alias for the misspelled variant.

.. and add that --proto-redir and CURLOPT_REDIR_PROTOCOLS do not
override protocols denied by --proto and CURLOPT_PROTOCOLS.

- Add a test to enforce: --proto deny must override --proto-redir allow

Closes https://github.com/curl/curl/pull/1031

Follow-up to 6140dfcf

Reported-by: Alexander Sinditskiy

Discussed in #997

Assisted-by: Jay Satiro

Bug: https://github.com/curl/curl/issues/1017
Reported-by: Jeroen Ooms

Closes https://github.com/curl/curl/pull/1028

LibreSSL defines `OPENSSL_VERSION_NUMBER` as `0x20000000L` for all
versions returning `LibreSSL/2.0.0` for any LibreSSL version.

This change provides a local OpenSSL_version_num function replacement
returning LIBRESSL_VERSION_NUMBER instead.

Closes #1029

Closes #1025
Closes #1026
Closes #1027

Follow-up fix to d9321562

The OpenSSL function CRYTPO_cleanup_all_ex_data() cannot be called
multiple times without crashing - and other libs might call it! We
basically cannot call it without risking a crash. The function is a
no-op since OpenSSL 1.1.0.

Not calling this function only risks a small memory leak with OpenSSL <
1.1.0.

Bug: https://curl.haxx.se/mail/lib-2016-09/0045.html
Reported-by: Todd Short

RC4 was a nice alternative to CBC back in the days of BEAST, but it's insecure and obsolete now.

Since I first wrote that text, Apple introduced tvOS and watchOS, and renamed "Mac OS X" to "macOS." Let's make the text a little more inclusive, since curl can be built for all four operating systems.