hash: provide asserts to verify API use

- converted the Curl_hash_count() macro to a function

- Discourage accessing struct fields directly

- Document the internal API in H

hash: provide asserts to verify API use

- converted the Curl_hash_count() macro to a function

- Discourage accessing struct fields directly

- Document the internal API in HASH.md

Closes #14503

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tests: fix bad printf format flags in test code

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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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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tests: several enumerated type cleanups

To please icc

Closes #9179

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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copyright: update copyright year ranges to 2021

Reviewed-by: Emil Engler
Closes #6802

lib: use int type for more port variables

This is a follow-up to 764c6bd. Prior to that change port variables
were usually type long.

Closes https://github.com/curl/curl/pull/65

lib: use int type for more port variables

This is a follow-up to 764c6bd. Prior to that change port variables
were usually type long.

Closes https://github.com/curl/curl/pull/6553

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copyright: fix year ranges

Follow-up from 4d2f8006777

curl.se: new home

Closes #6172

unit1609: fix mem-leak in OOM

Closes #4709

Curl_addr2string: take an addrlen argument too

This allows the function to figure out if a unix domain socket has a
file name or not associated with it! When a socket is created with

Curl_addr2string: take an addrlen argument too

This allows the function to figure out if a unix domain socket has a
file name or not associated with it! When a socket is created with
socketpair(), as done in the fuzzer testing, the path struct member is
uninitialized and must not be accessed.

Bug: https://crbug.com/oss-fuzz/16699

Closes #4283

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http3: make connection reuse work

Closes #4204

CURLOPT_DNS_USE_GLOBAL_CACHE: remove

Remove the code too. The functionality has been disabled in code since
7.62.0. Setting this option will from now on simply be ignored and have
no

CURLOPT_DNS_USE_GLOBAL_CACHE: remove

Remove the code too. The functionality has been disabled in code since
7.62.0. Setting this option will from now on simply be ignored and have
no function.

Closes #3654

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cleanup: make local functions static

urlapi: turn three local-only functions into statics

conncache: make conncache_find_first_connection static

multi: make detach_connnect

cleanup: make local functions static

urlapi: turn three local-only functions into statics

conncache: make conncache_find_first_connection static

multi: make detach_connnection static

connect: make getaddressinfo static

curl_ntlm_core: make hmac_md5 static

http2: make two functions static

http: make http_setup_conn static

connect: make tcpnodelay static

tests: make UNITTEST a thing to mark functions with, so they can be static for
normal builds and non-static for unit test builds

... and mark Curl_shuffle_addr accordingly.

url: make up_free static

setopt: make vsetopt static

curl_endian: make write32_le static

rtsp: make rtsp_connisdead static

warnless: remove unused functions

memdebug: remove one unused function, made another static

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CURLOPT_RESOLVE: always purge old entry first

If there's an existing entry using the selected name.

Closes #2622