follow-up to e66cca04

... instead of previous separate struct fields, to make it easier to
extend and change individual backends without having to modify them all.

closes #2547

Curl_setup_transfer() can be called to setup a new individual transfer
over a multiplexed connection so it shouldn't unset writesockfd.

Bug: #2520
Closes #2549

They are removed from the compiler flags.

This ensures that make dependency tracking will force a rebuild whenever
configure --enable-debug or --enable-curldebug changes.

Closes #2548

It triggers an assert.

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8144
Closes #2546

Closes #2531

When only building with SSL backends that don't use the CA bundle file
(by default), skip the check.

Fixes #2543
Fixes #2180
Closes #2545

ssh-libssh.c:2429:21: warning: result of '1 << 31' requires 33 bits to
represent, but 'int' only has 32 bits [-Wshift-overflow=]

'len' will never be that big anyway so I converted the run-time check to
a regular assert.

Commit 3c630f9b partially reverted the
changes from commit dd7521bc because of
the problem that strcpy_url() was modified unilaterally without also
modifying strlen_url(). As a consequence strcpy_url() was again
depending on ASCII encoding.

This change fixes strlen_url() and strcpy_url() in parallel to use a
common host-encoding independent criterion for deciding whether an URL
character must be %-escaped.

Closes #2535

Closes #2544

This reverts commit d5d683a9.

--disable-pthreads can be used to disable pthreads and get the threaded
resolver to use the windows threading when building with mingw.

... as it defines it (too)

Closes https://github.com/curl/curl/pull/2542

Feedback-by: Michael Kilburn

Closes #1411

Closes #1508

Closes #2051

Closes #1332

It seems to not be detected by default anymore (which is a bug I
believe)

Closes #2541

Closes #2299

Closes #2252

... and make test 1026 rely on that feature so that --disable-manual
builds don't cause test failures.

Reported-by: Max Dymond and Anders Roxell
Fixes #2533
Closes #2540

Commit 2bc230de made the macro MAX_COOKIE_LINE_TXT become unused,
so remove as it's not part of the published API.

Closes https://github.com/curl/curl/pull/2537

This extends the INDENTATION case to also handle 'else' statements
and require proper indentation on the following line. Also fixes the
offending cases found in the codebase.

Closes #2532

This function can get called on a connection that isn't setup enough to
have the 'recv_underlying' function pointer initialized so it would try
to call the NULL pointer.

Reported-by: Dario Weisser

Follow-up to db1b2c7f (never shipped in a release)
Closes #2536

Follow-up to 1514c446: replace another strstr() call done on a
buffer that might not be zero terminated - with a memchr() call, even if
we know the substring will be found.

Assisted-by: Max Dymond

Detected by OSS-Fuzz
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8021

Closes #2534

WolfSSL doesn't enable it by default anymore

All occurrences of assignment within conditional expression in
os400sys.c rewritten into two steps: first assignment and then the check
on the success of the assignment. Also adjust related incorrect brace
positions to match project indentation style.

This was spurred by seeing "if((inp = input_token))", but while in there
all warnings were fixed.

There should be no functional change from these changes.

Closes #2525

The jar should be written iff there are cookies, so ensure that we still
have cookies after expiration to avoid creating an empty file.

Closes #2529

OSS-Fuzz detected

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8000

Broke in dd7521bc

Coverity detected, CID 1435120

Closes #2527

With commit 4272a0b0 curl-speficic
character classification macros and functions were introduced in
curl_ctype.[ch] to avoid dependencies on the locale. This broke curl on
non-ASCII, e.g. EBCDIC platforms. This change restores the previous set
of character classification macros when CURL_DOES_CONVERSIONS is
defined.

Closes #2494

Fixes FTP wildcard parsing when done over a number of read buffers.

Regression from f786d1f1

Reported-by: wncboy on github
Fixes #2445
Closes #2526

http2-upload.c:135:44: error: ‘%02d’ directive output may be truncated
writing between 2 and 11 bytes into a region of size between 8 and 17