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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misc: fix spelling mistakes

Reported-by: musvaage on github
Fixes #11171
Closes #11172

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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netware: remove leftover traces

Commit 3b16575ae938dec2a29454631a12aa52b6ab9c67 removed support for
building on Novell Netware, but a few leftover traces remained. This
removes the l

netware: remove leftover traces

Commit 3b16575ae938dec2a29454631a12aa52b6ab9c67 removed support for
building on Novell Netware, but a few leftover traces remained. This
removes the last bits.

Closes: #9966
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

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misc: null-terminate

Make use of this term consistently.

Closes #9527

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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cmake: fix support for UnixSockets feature on Win32

Move the definition of sockaddr_un struct from config-win32.h to
curl_setup.h, so that it could be shared by all build systems.

cmake: fix support for UnixSockets feature on Win32

Move the definition of sockaddr_un struct from config-win32.h to
curl_setup.h, so that it could be shared by all build systems.

Add ADDRESS_FAMILY typedef for old mingw, now old mingw can also use
unix sockets.

Also fix the build of tests/server/sws.c on Win32 when USE_UNIX_SOCKETS
is defined.

Closes #7034

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build: fix compilation for Windows UWP platform

- Include afunix.h which is necessary for sockaddr_un when
USE_UNIX_SOCKETS is defined on Windows.

Closes https://github.com/cu

build: fix compilation for Windows UWP platform

- Include afunix.h which is necessary for sockaddr_un when
USE_UNIX_SOCKETS is defined on Windows.

Closes https://github.com/curl/curl/pull/7006

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tidy-up: make conditional checks more consistent

... remove '== NULL' and '!= 0'

Closes #6912

copyright: fix missing year (range) updates

misc: fix typos

Bug: https://curl.se/mail/lib-2021-01/0063.html
Closes #6434

curl.se: new home

Closes #6172

Curl_addrinfo: use one malloc instead of three

To reduce the amount of allocations needed for creating a Curl_addrinfo
struct, make a single larger malloc instead of three separate small

Curl_addrinfo: use one malloc instead of three

To reduce the amount of allocations needed for creating a Curl_addrinfo
struct, make a single larger malloc instead of three separate smaller
ones.

Closes #5533

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source cleanup: remove all custom typedef structs

- Stick to a single unified way to use structs
- Make checksrc complain on 'typedef struct {'
- Allow them in tests, public heade

source cleanup: remove all custom typedef structs

- Stick to a single unified way to use structs
- Make checksrc complain on 'typedef struct {'
- Allow them in tests, public headers and examples

- Let MD4_CTX, MD5_CTX, and SHA256_CTX typedefs remain as they actually
typedef different types/structs depending on build conditions.

Closes #5338

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windows: enable UnixSockets with all build toolchains

Extend existing unix socket support in Windows builds to be
enabled for all toolchain vendors or versions. (Previously
it was on

windows: enable UnixSockets with all build toolchains

Extend existing unix socket support in Windows builds to be
enabled for all toolchain vendors or versions. (Previously
it was only supported with certain MSVC versions + more recent
Windows 10 SDKs)

Ref: https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/
Ref: https://github.com/curl/curl/issues/5162
Closes: https://github.com/curl/curl/pull/5170

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memdebug: log pointer before freeing its data

Coverity warned for two potentional "Use after free" cases. Both are false
positives because the memory wasn't used, it was only the actual

memdebug: log pointer before freeing its data

Coverity warned for two potentional "Use after free" cases. Both are false
positives because the memory wasn't used, it was only the actual pointer
value that was logged.

The fix still changes the order of execution to avoid the warnings.

Coverity CID 1443033 and 1443034

Closes #3671

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memdebug: make debug-specific functions use curl_dbg_ prefix

To not "collide" or use up the regular curl_ name space. Also makes them
easier to detect in helper scripts.

Closes

memdebug: make debug-specific functions use curl_dbg_ prefix

To not "collide" or use up the regular curl_ name space. Also makes them
easier to detect in helper scripts.

Closes #3656

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curl_addrinfo: use same #ifdef conditions in source as header

... for curl_dofreeaddrinfo

curl_setup: provide a CURL_SA_FAMILY_T type if none exists

... and use this type instead of 'sa_family_t' in the code since several
platforms don't have it.

Closes #2463

build: add picky compiler warning flags for gcc 6 and 7

curl_addrinfo.c: Allow Unix Domain Sockets to compile under Windows

Windows 10.0.17061 SDK introduces support for Unix Domain Sockets.
Added the necessary include file to curl_addrinfo.c

curl_addrinfo.c: Allow Unix Domain Sockets to compile under Windows

Windows 10.0.17061 SDK introduces support for Unix Domain Sockets.
Added the necessary include file to curl_addrinfo.c.

Note: The SDK (which is considered beta) has to be installed, VS 2017
project file has to be re-targeted for Windows 10.0.17061 and #define
enabled in config-win32.h.

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configure: check for netinet/in6.h

Needed by HPE NonStop NSE and NSX systems

Fixes #2146
Closes #2155

code style: use spaces around equals signs

Improve code readbility

... by removing the else branch after a return, break or continue.

Closes #1310

addrinfo: fix compiler warning on offsetof() use

curl_addrinfo.c:519:20: error: conversion to ‘curl_socklen_t {aka
unsigned int}’ from ‘long unsigned int’ may alter its value
[-Werro

addrinfo: fix compiler warning on offsetof() use

curl_addrinfo.c:519:20: error: conversion to ‘curl_socklen_t {aka
unsigned int}’ from ‘long unsigned int’ may alter its value
[-Werror=conversion]

Follow-up to 1d786faee1046f

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