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We call setlocale() at the start of the function to get the current LC_CTYPE locale, then set it to what we need during the function, and then call setlocale() at the end to put it back again. But the middle call is allowed to invalidate the pointer returned from the first, so we have to save it in our own allocated storage until the end of the function. This bit me during development just now, and I was surprised that it hadn't come up before! But I suppose this is one of those things that's only _allowed_ to fail, and need not in all circumstances - perhaps it depends on what your LC_CTYPE was set to before.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.