sws: fix unused static function with `TCP_NODELAY` undefined

Closes #15171

cleanup: added space around ternary expressions

Closes #14990

cmake: allow building tests in unity mode

Makes building tests noticeably faster.

Apply changes/fixes/workarounds to make Unity work:
- rename test variables to avoid collisions

cmake: allow building tests in unity mode

Makes building tests noticeably faster.

Apply changes/fixes/workarounds to make Unity work:
- rename test variables to avoid collisions or shadowing each other when
combined into single units.
- add workaround to avoid applying `lib/memdebug.h` overrides to system
headers declaring/defining `getaddrinfo()`/`freeaddrinfo()` for
`tests/server/resolve.c`. This replaces a previous workaround that
worked for that specific source.
- rename test macro `CTRL` clashing with Cygwin `sys/ioctl.h`.
- add include guard to `test.h`.

Also:
- exclude `tests/http/clients` which are all single-source. (like
`docs/examples`.)

Build time improvements for tests:
- AppVeyor CI:
- MSVC 2008, 2010: 1 minute faster (4m8s -> 2m56s, 3m19s -> 2m24s)
- MSVC 2022 arm64: 3.5 minutes faster (10m18s -> 6m48s)
before: https://ci.appveyor.com/project/curlorg/curl/builds/50522785
after: https://ci.appveyor.com/project/curlorg/curl/builds/50522942
- GHA:
- Cygwin: 1.5 minutes faster (3m13s -> 1m43s)
before: https://github.com/curl/curl/actions/runs/10681535327/job/29605384398
after: https://github.com/curl/curl/actions/runs/10680818726/job/29603130637
- Windows:
before: https://github.com/curl/curl/actions/runs/10680818713
after: https://github.com/curl/curl/actions/runs/10683850187
- MSYS2, mingw-w64: 1 minute faster
- MSVC: 30 seconds faster (3m17s -> 2m48s)
- macOS: double speed (39s -> 18s)
before: https://github.com/curl/curl/actions/runs/10680818753/job/29603133447
after: https://github.com/curl/curl/actions/runs/10683850174/job/29612914515
- Linux: almost double speed (30/31s -> 18s)
before: https://github.com/curl/curl/actions/runs/10681535311/job/29605387156
after: https://github.com/curl/curl/actions/runs/10680818721/job/29603133976
- non-native: no obvious effect.
before: https://github.com/curl/curl/actions/runs/10680818722
after: https://github.com/curl/curl/actions/runs/10683850187
- Old Linux: Unity mode not supported by old CMake, no effect.

Closes #14765

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lib/src: white space edits to comply better with code style

... as checksrc now finds and complains about these.

Closes #14921

lib, src, tests: added space around ternary expressions

Closes #14912

tests: tweak lock file handling and timers

- when server are killed by a test case, do not wait for the server lock
file to go away. These tests are mostly about client timeouts and th

tests: tweak lock file handling and timers

- when server are killed by a test case, do not wait for the server lock
file to go away. These tests are mostly about client timeouts and the
server will hang until killed.
- when killing a server successfully, check for a remaining lock file,
log its existence and remove it.
- lower the delay timings on SLOWDOWN by half
- add SLOWDOWNDATA server command to only slow down the FTP data bytes,
not the control ones.
- lower some timeout values

Closes #14835

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lib: use FMT_ as prefix instead of CURL_FORMAT_

For printf format defines used internally. Makes the code slighly
easier to read.

Closes #14764

openssl: fix the data race when sharing an SSL session between threads

The SSL_Session object is mutated during connection inside openssl,
and it might not be thread-safe. Besides, accor

openssl: fix the data race when sharing an SSL session between threads

The SSL_Session object is mutated during connection inside openssl,
and it might not be thread-safe. Besides, according to documentation
of openssl:

```
SSL_SESSION objects keep internal link information about the session
cache list, when being inserted into one SSL_CTX object's session
cache. One SSL_SESSION object, regardless of its reference count,
must therefore only be used with one SSL_CTX object (and the SSL
objects created from this SSL_CTX object).
```
If I understand correctly, it is not safe to share it even in a
single thread.

Instead, serialize the SSL_SESSION before adding it to the cache,
and deserialize it after retrieving it from the cache, so that no
concurrent write to the same object is infeasible.

Also
- add a ci test for thread sanitizer
- add a test for sharing ssl sessions concurrently
- avoid redefining memory functions when not building libcurl, but
including the soruce in libtest
- increase the concurrent connections limit in sws

Notice that there are fix for a global data race for openssl which
is not yet release. The fix is cherry pick for the ci test with
thread sanitizer.
https://github.com/openssl/openssl/commit/d8def79838cd0d5e7c21d217aa26edb5229f0ab4

Closes #14751

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src: fix potential macro confusion in cmake unity builds

Sources used `lib/curlx.h` with both `ENABLE_CURLX_PRINTF` set and unset
before including it.

In a cmake "unity" batch w

src: fix potential macro confusion in cmake unity builds

Sources used `lib/curlx.h` with both `ENABLE_CURLX_PRINTF` set and unset
before including it.

In a cmake "unity" batch where the first included source had it unset,
the next sources did not get the macros requested with
`ENABLE_CURLX_PRINTF` because `lib/curl.x` had already been included
without them.

Fix it by by making the macros enabled permanently and globally for
internal sources, and dropping `ENABLE_CURLX_PRINTF`.

This came up while testing unity builds with smaller batches. The full,
default unity build where all `src` is bundled up in a single unit, was
not affected.

Fixes:
```
$ cmake -B build -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=15
$ make -C build
...
curl/src/tool_getparam.c: In function ‘getparameter’:
curl/src/tool_getparam.c:2409:11: error: implicit declaration of function ‘msnprintf’; did you mean ‘vsnprintf’? [-Wimplicit-function-declaration]
2409 | msnprintf(buffer, sizeof(buffer), "%" CURL_FORMAT_CURL_OFF_T "-",
| ^~~~~~~~~
| vsnprintf
curl/src/tool_getparam.c:2409:11: warning: nested extern declaration of ‘msnprintf’ [-Wnested-externs]
[...]
```

Reported-by: Daniel Stenberg
Bug: https://github.com/curl/curl/pull/14626#issuecomment-2301663491

Closes #14632

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tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.

Mostly OS names and a few more.

Also a couple of other minor text fixups.

Closes #14360

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build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch ma

build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch makes the source use
the latter for consistency with other similar switches.

`-DENABLE_IPV6` remains accepted for compatibility as a synonym for
`-DUSE_IPV6`, when passed to the compiler.

`ENABLE_IPV6` also remains the name of the CMake and `Makefile.vc`
options to control this feature.

Closes #13349

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build: enable missing OpenSSF-recommended warnings, with fixes

https://best.openssf.org/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C++.html
as of 2023-11-29 [1]

build: enable missing OpenSSF-recommended warnings, with fixes

https://best.openssf.org/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C++.html
as of 2023-11-29 [1].

Enable new recommended warnings (except `-Wsign-conversion`):

- enable `-Wformat=2` for clang (in both cmake and autotools).
- add `CURL_PRINTF()` internal attribute and mark functions accepting
printf arguments with it. This is a copy of existing
`CURL_TEMP_PRINTF()` but using `__printf__` to make it compatible
with redefinting the `printf` symbol:
https://gcc.gnu.org/onlinedocs/gcc-3.0.4/gcc_5.html#SEC94
- fix `CURL_PRINTF()` and existing `CURL_TEMP_PRINTF()` for
mingw-w64 and enable it on this platform.
- enable `-Wimplicit-fallthrough`.
- enable `-Wtrampolines`.
- add `-Wsign-conversion` commented with a FIXME.
- cmake: enable `-pedantic-errors` the way we do it with autotools.
Follow-up to d5c0351055d5709da8f3e16c91348092fdb481aa #2747
- lib/curl_trc.h: use `CURL_FORMAT()`, this also fixes it to enable format
checks. Previously it was always disabled due to the internal `printf`
macro.

Fix them:

- fix bug where an `set_ipv6_v6only()` call was missed in builds with
`--disable-verbose` / `CURL_DISABLE_VERBOSE_STRINGS=ON`.
- add internal `FALLTHROUGH()` macro.
- replace obsolete fall-through comments with `FALLTHROUGH()`.
- fix fallthrough markups: Delete redundant ones (showing up as
warnings in most cases). Add missing ones. Fix indentation.
- silence `-Wformat-nonliteral` warnings with llvm/clang.
- fix one `-Wformat-nonliteral` warning.
- fix new `-Wformat` and `-Wformat-security` warnings.
- fix `CURL_FORMAT_SOCKET_T` value for mingw-w64. Also move its
definition to `lib/curl_setup.h` allowing use in `tests/server`.
- lib: fix two wrongly passed string arguments in log outputs.
Co-authored-by: Jay Satiro
- fix new `-Wformat` warnings on mingw-w64.

[1] https://github.com/ossf/wg-best-practices-os-developers/blob/56c0fde3895bfc55c8a973ef49a2572c507b2ae1/docs/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C%2B%2B.md

Closes #12489

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windows: use built-in `_WIN32` macro to detect Windows

Windows compilers define `_WIN32` automatically. Windows SDK headers
or build env defines `WIN32`, or we have to take care of it. T

windows: use built-in `_WIN32` macro to detect Windows

Windows compilers define `_WIN32` automatically. Windows SDK headers
or build env defines `WIN32`, or we have to take care of it. The
agreement seems to be that `_WIN32` is the preferred practice here.
Make the source code rely on that to detect we're building for Windows.

Public `curl.h` was using `WIN32`, `__WIN32__` and `CURL_WIN32` for
Windows detection, next to the official `_WIN32`. After this patch it
only uses `_WIN32` for this. Also, make it stop defining `CURL_WIN32`.

There is a slight chance these break compatibility with Windows
compilers that fail to define `_WIN32`. I'm not aware of any obsolete
or modern compiler affected, but in case there is one, one possible
solution is to define this macro manually.

grepping for `WIN32` remains useful to discover Windows-specific code.

Also:

- extend `checksrc` to ensure we're not using `WIN32` anymore.

- apply minor formatting here and there.

- delete unnecessary checks for `!MSDOS` when `_WIN32` is present.

Co-authored-by: Jay Satiro
Reviewed-by: Daniel Stenberg

Closes #12376

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build: delete checks for C89 standard headers

Delete checks and guards for standard C89 headers and assume these are
available: `stdio.h`, `string.h`, `time.h`, `setjmp.h`, `stdlib.h`,

build: delete checks for C89 standard headers

Delete checks and guards for standard C89 headers and assume these are
available: `stdio.h`, `string.h`, `time.h`, `setjmp.h`, `stdlib.h`,
`stddef.h`, `signal.h`.

Some of these we already used unconditionally, some others we only used
for feature checks.

Follow-up to 9c7165e96a3a9a2d0b7059c87c699b5ca8cdae93 #11918 (for `stdio.h` in CMake)

Closes #11940

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tests: fix compiler warnings

Seen with llvm 17 on Windows x64.

```
.../curl/tests/server/rtspd.c:136:13: warning: no previous extern declaration for non-static variable 'logdir'

tests: fix compiler warnings

Seen with llvm 17 on Windows x64.

```
.../curl/tests/server/rtspd.c:136:13: warning: no previous extern declaration for non-static variable 'logdir' [-Wmissing-variable-declarations]
136 | const char *logdir = "log";
| ^
.../curl/tests/server/rtspd.c:136:7: note: declare 'static' if the variable is not intended to be used outside of this translation unit
136 | const char *logdir = "log";
| ^
.../curl/tests/server/rtspd.c:137:6: warning: no previous extern declaration for non-static variable 'loglockfile' [-Wmissing-variable-declarations]
137 | char loglockfile[256];
| ^
.../curl/tests/server/rtspd.c:137:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
137 | char loglockfile[256];
| ^
.../curl/tests/server/fake_ntlm.c:43:13: warning: no previous extern declaration for non-static variable 'logdir' [-Wmissing-variable-declarations]
43 | const char *logdir = "log";
| ^
.../curl/tests/server/fake_ntlm.c:43:7: note: declare 'static' if the variable is not intended to be used outside of this translation unit
43 | const char *logdir = "log";
| ^
.../curl/src/tool_doswin.c:350:8: warning: possible misuse of comma operator here [-Wcomma]
350 | ++d, ++s;
| ^
.../curl/src/tool_doswin.c:350:5: note: cast expression to void to silence warning
350 | ++d, ++s;
| ^~~
| (void)( )
```

```
.../curl/tests/libtest/lib540.c:146:27: warning: result of comparison 'long' > 2147483647 is always false [-Wtautological-type-limit-compare]
146 | int itimeout = (L > (long)INT_MAX) ? INT_MAX : (int)L;
| ~ ^ ~~~~~~~~~~~~~
1 warning generated.

.../curl/tests/libtest/libntlmconnect.c:195:31: warning: result of comparison 'long' > 2147483647 is always false [-Wtautological-type-limit-compare]
195 | int itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;
| ~~~~~~~ ^ ~~~~~~~~~~~~~
1 warning generated.

.../curl/tests/libtest/lib591.c:117:31: warning: result of comparison 'long' > 2147483647 is always false [-Wtautological-type-limit-compare]
117 | int itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;
| ~~~~~~~ ^ ~~~~~~~~~~~~~
1 warning generated.
.../curl/tests/libtest/lib597.c:99:31: warning: result of comparison 'long' > 2147483647 is always false [-Wtautological-type-limit-compare]
99 | int itimeout = (timeout > (long)INT_MAX) ? INT_MAX : (int)timeout;
| ~~~~~~~ ^ ~~~~~~~~~~~~~
1 warning generated.
```

Seen on macOS Intel:
```
.../curl/tests/server/sws.c:440:64: warning: field precision should have type 'int', but argument has type 'size_t' (aka 'unsigned long') [-Wformat]
msnprintf(logbuf, sizeof(logbuf), "Got request: %s %.*s HTTP/%d.%d",
~~^~
1 warning generated.
```

Closes #11925

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http: close the connection after a late 417 is received

In this situation, only part of the data has been sent before aborting
so the connection is no longer usable.

Assisted-by

http: close the connection after a late 417 is received

In this situation, only part of the data has been sent before aborting
so the connection is no longer usable.

Assisted-by: Jay Satiro
Fixes #11678
Closes #11679

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tests: add delay command to the HTTP server

This adds a delay after client connect.

runtests: rename server command file

The name ftpserver.cmd was historical and has been used for more than
ftp for many years now. Rename it to plain server.cmd to reduce
confusion.

tests: fix error messages & handling around sockets

The wrong error code was checked on Windows on UNIX socket failures,
which could have caused all UNIX sockets to be reported as having

tests: fix error messages & handling around sockets

The wrong error code was checked on Windows on UNIX socket failures,
which could have caused all UNIX sockets to be reported as having
errored and the tests therefore skipped. Also, a useless error message
was displayed on socket errors in many test servers on Windows because
strerror() doesn't work on WinSock error codes; perror() is overridden
there to work on all errors and is used instead.

Ref #11258
Closes #11265

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runtests; give each server a unique log lock file

Logs are written by several servers and all of them must be finished
writing before the test results can be determined. This means each

runtests; give each server a unique log lock file

Logs are written by several servers and all of them must be finished
writing before the test results can be determined. This means each
server must have its own lock file rather than sharing a single one,
which is how it was done up to now. Previously, the first server to
complete a test would clear the lock before the other server was done,
which caused flaky tests.

Lock files are now all found in their own directory, so counting locks
equals counting the files in that directory. The result is that the
proxy logs are now reliably written which actually changes the expected
output for two tests.

Fixes #11231
Closes #11259

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checksrc: disallow spaces before labels

Out of 415 labels throughout the code base, 86 of those labels were
not at the start of the line. Which means labels always at the start of
th

checksrc: disallow spaces before labels

Out of 415 labels throughout the code base, 86 of those labels were
not at the start of the line. Which means labels always at the start of
the line is the favoured style overall with 329 instances.

Out of the 86 labels not at the start of the line:
* 75 were indented with the same indentation level of the following line
* 8 were indented with exactly one space
* 2 were indented with one fewer indentation level then the following
line
* 1 was indented with the indentation level of the following line minus
three space (probably unintentional)

Co-Authored-By: Viktor Szakats

Closes #11134

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tests: log a too-long Unix socket path in sws and socksd

Ref: #10919

sws: comparison of unsigned expression < 0 is always false

Follow-up to 356dd0b73a75ed6d5

Closes #10903

tests: increase sws timeout for more robust testing

- for https CONNECT forwarding, this was fixed at 5 seconds
which led to spurious CI test failures
- add --keepalive parameter t

tests: increase sws timeout for more robust testing

- for https CONNECT forwarding, this was fixed at 5 seconds
which led to spurious CI test failures
- add --keepalive parameter to sws to control this
- let httpserver use 30 seconds

Closes #10898

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tests: fix fake_ntlm to run with a dynamic log directory

Ref: #10818