58 lines
2.2 KiB
Markdown
58 lines
2.2 KiB
Markdown
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Version Numbers and Releases
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============================
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Curl is not only curl. Curl is also libcurl. They are actually individually
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versioned, but they usually follow each other closely.
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The version numbering is always built up using the same system:
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X.Y.Z
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- X is main version number
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- Y is release number
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- Z is patch number
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## Bumping numbers
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One of these numbers get bumped in each new release. The numbers to the right
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of a bumped number are reset to zero.
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The main version number is bumped when *really* big, world colliding changes
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are made. The release number is bumped when changes are performed or
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things/features are added. The patch number is bumped when the changes are
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mere bugfixes.
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It means that after release 1.2.3, we can release 2.0.0 if something really
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big has been made, 1.3.0 if not that big changes were made or 1.2.4 if only
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bugs were fixed.
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Bumping, as in increasing the number with 1, is unconditionally only
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affecting one of the numbers (except the ones to the right of it, that may be
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set to zero). 1 becomes 2, 3 becomes 4, 9 becomes 10, 88 becomes 89 and 99
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becomes 100. So, after 1.2.9 comes 1.2.10. After 3.99.3, 3.100.0 might come.
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All original curl source release archives are named according to the libcurl
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version (not according to the curl client version that, as said before, might
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differ).
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As a service to any application that might want to support new libcurl
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features while still being able to build with older versions, all releases
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have the libcurl version stored in the `curl/curlver.h` file using a static
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numbering scheme that can be used for comparison. The version number is
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defined as:
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```c
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#define LIBCURL_VERSION_NUM 0xXXYYZZ
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```
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Where `XX`, `YY` and `ZZ` are the main version, release and patch numbers in
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hexadecimal. All three number fields are always represented using two digits
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(eight bits each). 1.2 would appear as "0x010200" while version 9.11.7
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appears as `0x090b07`.
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This 6-digit hexadecimal number is always a greater number in a more recent
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release. It makes comparisons with greater than and less than work.
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This number is also available as three separate defines:
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`LIBCURL_VERSION_MAJOR`, `LIBCURL_VERSION_MINOR` and `LIBCURL_VERSION_PATCH`.
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