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build: tidy up and dedupe strdup functions

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- de-dupe lib/src strdup/memdup functions into curlx.
- introduce `CURLX_STRDUP_LOW()` for mapping `strdup()`, and to do it at
  one place within the code, in `curl_setup.h`.
- tests/server: use `curlx_strdup()`. (Also to fix building without
  a system `strdup()`.)
- curlx/curlx.h: shorten and tidy up.
- adjust Windows build path to not need `HAVE_STRDUP`.
- build: stop detecting `HAVE_STRDUP` on Windows.

Closes #20497
This commit is contained in:
Viktor Szakats 2026-02-02 14:08:14 +01:00
parent e39650c984
commit 31a4f415af
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50 changed files with 171 additions and 333 deletions
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4
CMakeLists.txt
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@ -1607,9 +1607,7 @@ check_function_exists("getrlimit" HAVE_GETRLIMIT)
check_function_exists("setlocale" HAVE_SETLOCALE)
check_function_exists("setrlimit" HAVE_SETRLIMIT)
if(WIN32)
set(HAVE_STRDUP 1) # to not define local implementation. curl uses _strdup() on Windows.
else()
if(NOT WIN32)
check_function_exists("if_nametoindex" HAVE_IF_NAMETOINDEX) # net/if.h
check_function_exists("realpath" HAVE_REALPATH)
check_function_exists("sched_yield" HAVE_SCHED_YIELD)