tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

tool: reorganize function c_escape around a dynbuf

This is a bit shorter and a lot safer.

Substrings of unescaped characters are added by a single call to reduce
overhead.

tool: reorganize function c_escape around a dynbuf

This is a bit shorter and a lot safer.

Substrings of unescaped characters are added by a single call to reduce
overhead.

Extend test 1465 to handle more kind of escapes.

Closes #9653

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tool: avoid generating ambiguous escaped characters in --libcurl

C string hexadecimal-escaped characters may have more than 2 digits.
This results in a wrong C compiler interpretation of

tool: avoid generating ambiguous escaped characters in --libcurl

C string hexadecimal-escaped characters may have more than 2 digits.
This results in a wrong C compiler interpretation of a 2-digit escaped
character when followed by an hex digit character.

The solution retained here is to represent such characters as 3-digit
octal escapes.

Adjust and extend test 1465 for this case.

Closes #9643

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tool_setopt: use better English in --libcurl source comments

Like this:

XYZ was set to an object pointer
ABC was set to a function pointer

Closes #9475

curl: correct grammar in generated libcurl code

Closes #7802

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

tests: make --libcurl tests only test FTP options if ftp enabled

Adjust six --libcurl tests to only check the FTP option if FTP is
actually present in the build.

Fixes #6303

tests: make --libcurl tests only test FTP options if ftp enabled

Adjust six --libcurl tests to only check the FTP option if FTP is
actually present in the build.

Fixes #6303
Closes #6305

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ftp: CURLOPT_FTP_SKIP_PASV_IP by default

The command line tool also independently sets --ftp-skip-pasv-ip by
default.

Ten test cases updated to adapt the modified --libcurl outp

ftp: CURLOPT_FTP_SKIP_PASV_IP by default

The command line tool also independently sets --ftp-skip-pasv-ip by
default.

Ten test cases updated to adapt the modified --libcurl output.

Bug: https://curl.se/docs/CVE-2020-8284.html
CVE-2020-8284

Reported-by: Varnavas Papaioannou

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curl.se: new home

Closes #6172

runtests: provide curl's version string as %VERSION for tests

... so that we can check HTTP requests for User-Agent: curl/%VERSION

Update 600+ test cases accordingly.

Close

runtests: provide curl's version string as %VERSION for tests

... so that we can check HTTP requests for User-Agent: curl/%VERSION

Update 600+ test cases accordingly.

Closes #6037

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test1465: verify --libcurl with binary POST data