Closes #1888

Closes #1809

Closes https://github.com/curl/curl/pull/2266

If CURL_DOES_CONVERSION is enabled, uploaded LFs are mapped to CRLFs,
giving a result that is different from what is expected.
This commit avoids using CURLOPT_TRANSFERTEXT and directly encodes data
to upload in ascii.

Bug: https://github.com/curl/curl/pull/1872

... with clang on macos

Data mismatch caused test 545 to fail when character encoding
conversion is enabled.

Bug: https://github.com/curl/curl/pull/1872

inadvertently removed in 283babfa

Closes #2263

Closes #2085

Assign the time_t variable negative value and then check if it is
greater than zero, which will evaluate true for unsigned time_t but
false for signed time_t.

Make curl_getdate() handle dates before 1970 as well (returning negative
values).

Make test 517 test dates for 64 bit time_t.

This fixes bug (3) mentioned in #2238

Closes #2250

Here is a version that should work with all versions of openssl 0.9.7
through 1.1.0.

Links to the docs:
https://www.openssl.org/docs/man1.0.2/crypto/EVP_DigestInit.html
https://www.openssl.org/docs/man1.1.0/crypto/EVP_DigestInit.html

At the very bottom of the 1.1.0 documentation there is a history section
that states, " stack allocated EVP_MD_CTXs are no longer supported."

If EVP_MD_CTX_create and EVP_MD_CTX_destroy are not defined, then a
simple mapping can be used as described here:
https://wiki.openssl.org/index.php/Talk:OpenSSL_1.1.0_Changes

Closes #2258

Closes #1429

It was once used for some debugging/verifying logic but should never have
ended up in git!

An idea that popped up in discussions on twitter.

Reported-By: Gisle Vanem
Bug: https://github.com/curl/curl/commit/993dd5651a6c853bfe3870f6a69c7b329fa4e8ce#commitcomment-27070080

djgpp do have 'mkdir(dir, mode)'. Other DOS-compilers does not 
But djgpp seems the only choice for MSDOS anyway.

PellesC do have a 'F_OK' defined in it's <unistd.h>.

Update year in Copyright.

Bug: https://curl.haxx.se/mail/lib-2018-01/0087.html
Reported-by: John Hascall

Closes #2257

... unless CURLOPT_UNRESTRICTED_AUTH is set to allow them. This matches how
curl already handles Authorization headers created internally.

Note: this changes behavior slightly, for the sake of reducing mistakes.

Added test 317 and 318 to verify.

Reported-by: Craig de Stigter
Bug: https://curl.haxx.se/docs/adv_2018-b3bf.html

Get screen width from the environment variable COLUMNS first, if set. If
not, use ioctl(). If nether works, assume 79.

Closes #2242

The "refresh" is for the -# output when no total transfer size is
known. It will now only use a single updated line even for this case:

The "-=O=-" ship moves when data is transferred. The four flying
"hashes" move (on a sine wave) on each refresh, independent of data.

Fixes #2237
Closes #2249

vtls.c:multissl_init() might do a curl_free() call so strip that out to
make this work with more builds. We just want to verify that
memorytracking works so skipping one line is no harm.

Reported-by: XhstormR on github
Fixes #2245

In case an identity didn't match[0], the state machine would fail in
state SSH_AUTH_AGENT instead of progressing to the next identity in
ssh-agent. As a result, ssh-agent authentication only worked if the
identity required happened to be the first added to ssh-agent.

This was introduced as part of commit c4eb10e2, which
stated that the "else" statement was required to prevent getting stuck
in state SSH_AUTH_AGENT. Given the state machine's logic and libssh2's
interface I couldn't see how this could happen or reproduce it and I
also couldn't find a more detailed description of the problem which
would explain a test case to reproduce the problem this was supposed to
fix.

[0] libssh2_agent_userauth returning LIBSSH2_ERROR_AUTHENTICATION_FAILED

Closes #2248

Coverity CID 1427646.

Follow-up to 84fcaa2e. libressl does not have the API even if it says it is
late OpenSSL version...

Fixes #2246
Closes #2247

Reported-by: jungle-boogie on github

... to avoid excessive recursive calls. The number 5 is totally
arbitrary and could be modified if someone has a good motivation.

.... and avoid advancing the pointer to trigger an out of buffer read.

Detected by OSS-fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5251
Assisted-by: Max Dymond

1. don't use "ULL" suffix since unsupported in older MSVC
2. use curl_off_t instead of custom long long ifdefs
3. make get_posix_time() not do unaligned data access

Fixes #2211
Closes #2240
Reported-by: Chester Liu