code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname

code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname
- file name => filename
- user name = username
- man page => manpage
- run-time => runtime
- set-up => setup
- back-end => backend
- a HTTP => an HTTP
- Two spaces after a period => one space after period

Closes #14073

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TLS: add support for ECH (Encrypted Client Hello)

An EXPERIMENTAL feature used with CURLOPT_ECH and --ech.

Closes #11922

curl.h: add CURLE_TOO_LARGE

A new error code to be used when an internal field grows too large, like
when a dynbuf reaches its maximum. Previously it would return
CURLE_OUT_OF_MEMORY

curl.h: add CURLE_TOO_LARGE

A new error code to be used when an internal field grows too large, like
when a dynbuf reaches its maximum. Previously it would return
CURLE_OUT_OF_MEMORY for this, which is highly misleading.

Ref: #12268
Closes #12269

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urlapi: add CURLU_PUNYCODE

Allows curl_url_get() get the punycode version of host names for the
host name and URL parts.

Extend test 1560 to verify.

Closes #10109

strerror: improve two URL API error messages

curl.h: CURLE_CONV_FAILED is obsoleted

The last use was removed in 7.82.0. Updated some docs too to reflect the
current error code situation.

Closes #9067

select: return error from "lethal" poll/select errors

Adds two new error codes: CURLE_UNRECOVERABLE_POLL and
CURLM_UNRECOVERABLE_POLL one each for the easy and the multi interfaces.

select: return error from "lethal" poll/select errors

Adds two new error codes: CURLE_UNRECOVERABLE_POLL and
CURLM_UNRECOVERABLE_POLL one each for the easy and the multi interfaces.

Reported-by: Harry Sintonen
Fixes #8921
Closes #8961

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lib: remove support for CURL_DOES_CONVERSIONS

TPF was the only user and support for that was dropped.

Closes #8378

ldap: return CURLE_URL_MALFORMAT for bad URL

For consistency, use the same return code for URL malformats,
independently of what scheme that is used. Previously this would return
CUR

ldap: return CURLE_URL_MALFORMAT for bad URL

For consistency, use the same return code for URL malformats,
independently of what scheme that is used. Previously this would return
CURLE_LDAP_INVALID_URL, but starting now that error cannot be returned.

Closes #8170

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multi: handle errors returned from socket/timer callbacks

The callbacks were partially documented to support this. Now the
behavior is documented and returning error from either of these

multi: handle errors returned from socket/timer callbacks

The callbacks were partially documented to support this. Now the
behavior is documented and returning error from either of these
callbacks will effectively kill all currently ongoing transfers.

Added test 530 to verify

Reported-by: Marcelo Juchem
Fixes #8083
Closes #8089

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urlapi: provide more detailed return codes

Previously, the return code CURLUE_MALFORMED_INPUT was used for almost
30 different URL format violations. This made it hard for users to
u

urlapi: provide more detailed return codes

Previously, the return code CURLUE_MALFORMED_INPUT was used for almost
30 different URL format violations. This made it hard for users to
understand why a particular URL was not acceptable. Since the API cannot
point out a specific position within the URL for the problem, this now
instead introduces a number of additional and more fine-grained error
codes to allow the API to return more exactly in what "part" or section
of the URL a problem was detected.

Also bug-fixes curl_url_get() with CURLUPART_ZONEID, which previously
returned CURLUE_OK even if no zoneid existed.

Test cases in 1560 have been adjusted and extended. Tests 1538 and 1559
have been updated.

Updated libcurl-errors.3 and curl_url_strerror() accordingly.

Closes #8049

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urlapi: add curl_url_strerror()

Add curl_url_strerror() to convert CURLUcode into readable string and
facilitate easier troubleshooting in programs using URL API.
Extend CURLUcode wi

urlapi: add curl_url_strerror()

Add curl_url_strerror() to convert CURLUcode into readable string and
facilitate easier troubleshooting in programs using URL API.
Extend CURLUcode with CURLU_LAST for iteration in unit tests.
Update man pages with a mention of new function.
Update example code and tests with new functionality where it fits.

Closes #7605

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CURLE_SETOPT_OPTION_SYNTAX: new error name for wrong setopt syntax

For options that pass in lists or strings that are subsequently parsed
and must be correct. This broadens the scope for

CURLE_SETOPT_OPTION_SYNTAX: new error name for wrong setopt syntax

For options that pass in lists or strings that are subsequently parsed
and must be correct. This broadens the scope for the option previously
known as CURLE_TELNET_OPTION_SYNTAX but the old name is of course still
provided as a #define for existing applications.

Closes #7175

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CURLcode: add CURLE_SSL_CLIENTCERT

When a TLS server requests a client certificate during handshake and
none can be provided, libcurl now returns this new error code
CURLE_SSL_CLIENT

CURLcode: add CURLE_SSL_CLIENTCERT

When a TLS server requests a client certificate during handshake and
none can be provided, libcurl now returns this new error code
CURLE_SSL_CLIENTCERT

Only supported by Secure Transport and OpenSSL for TLS 1.3 so far.

Closes #6721

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tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

CURLE_PROXY: new error code

Failures clearly returned from a (SOCKS) proxy now causes this return
code. Previously the situation was not very clear as what would be
returned and when

CURLE_PROXY: new error code

Failures clearly returned from a (SOCKS) proxy now causes this return
code. Previously the situation was not very clear as what would be
returned and when.

In addition: when this error code is returned, an application can use
CURLINFO_PROXY_ERROR to query libcurl for the detailed error, which then
returns a value from the new 'CURLproxycode' enum.

Closes #5770

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ngtcp2: Add an error code for QUIC connection errors

- Add new error code CURLE_QUIC_CONNECT_ERROR for QUIC connection
errors.

Prior to this change CURLE_FAILED_INIT was used,

ngtcp2: Add an error code for QUIC connection errors

- Add new error code CURLE_QUIC_CONNECT_ERROR for QUIC connection
errors.

Prior to this change CURLE_FAILED_INIT was used, but that was not
correct.

Closes https://github.com/curl/curl/pull/4754

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multi: Change curl_multi_wait/poll to error on negative timeout

- Add new error CURLM_BAD_FUNCTION_ARGUMENT and return that error when
curl_multi_wait/poll is passed timeout param < 0.

multi: Change curl_multi_wait/poll to error on negative timeout

- Add new error CURLM_BAD_FUNCTION_ARGUMENT and return that error when
curl_multi_wait/poll is passed timeout param < 0.

Prior to this change passing a negative value to curl_multi_wait/poll
such as -1 could cause the function to wait forever.

Reported-by: hamstergene@users.noreply.github.com

Fixes https://github.com/curl/curl/issues/4763

Closes https://github.com/curl/curl/pull/4765

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multi: add curl_multi_wakeup()

This commit adds curl_multi_wakeup() which was previously in the TODO
list under the curl_multi_unblock name.

On some platforms and with some conf

multi: add curl_multi_wakeup()

This commit adds curl_multi_wakeup() which was previously in the TODO
list under the curl_multi_unblock name.

On some platforms and with some configurations this feature might not be
available or can fail, in these cases a new error code
(CURLM_WAKEUP_FAILURE) is returned from curl_multi_wakeup().

Fixes #4418
Closes #4608

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include: make CURLE_HTTP3 use a new error code

To avoid potential issues with error code reuse.

Reported-by: Christoph M. Becker
Assisted-by: Dan Fandrich
Fixes #4601
Cl

include: make CURLE_HTTP3 use a new error code

To avoid potential issues with error code reuse.

Reported-by: Christoph M. Becker
Assisted-by: Dan Fandrich
Fixes #4601
Closes #4627

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quiche: reject headers in the wrong order

Pseudo header MUST come before regular headers or cause an error.

Reported-by: Cynthia Coan
Fixes #4571
Closes #4584

vauth: Use CURLE_AUTH_ERROR for auth function errors

- Add new error code CURLE_AUTH_ERROR.

Prior to this change auth function errors were signaled by
CURLE_OUT_OF_MEMORY and CU

vauth: Use CURLE_AUTH_ERROR for auth function errors

- Add new error code CURLE_AUTH_ERROR.

Prior to this change auth function errors were signaled by
CURLE_OUT_OF_MEMORY and CURLE_RECV_ERROR, and neither one was
technically correct.

Ref: https://github.com/curl/curl/pull/3848

Co-authored-by: Dominik Hölzl

Closes https://github.com/curl/curl/pull/3864

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ssl: deprecate CURLE_SSL_CACERT in favour of a unified error code

Long live CURLE_PEER_FAILED_VERIFICATION

TODO fixed: Detect when called from within callbacks

Closes #2302

test1538: added "verbose logs" keyword

These error messages are not displayed with --disable-verbose