kc3-lang/gnulib/doc/posix-functions/setlocale.texi

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• Hash : 653bc7d2
  Author :
  Date : 2023-01-16T14:34:56
  

  mbrtowc, mbrtoc32 tests: Avoid test failure on Android ≥ 5.0.
  
  * tests/test-mbrtowc.c (main): On Android 5.0 or newer, when testing
  the "C" locale, verify that the encoding is UTF-8.
  * tests/test-mbrtoc32.c (main): Likewise.
  * doc/posix-functions/setlocale.texi: Mention the Android problems.
  

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• doc/posix-functions/setlocale.texi

• @node setlocale
  @section @code{setlocale}
  @findex setlocale
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/setlocale.html}
  
  Gnulib module: setlocale, setlocale-null
  
  Portability problems fixed by Gnulib module @code{setlocale}:
  @itemize
  @item
  On Windows platforms (excluding Cygwin), @code{setlocale(@var{category},NULL)}
  ignores the environment variables @code{LC_ALL}, @code{@var{category}}, and
  @code{LANG}.
  @item
  On Windows platforms (excluding Cygwin) and Cygwin 1.5.x,
  @code{setlocale(LC_ALL,@var{name})} succeeds and sets the LC_CTYPE category to
  @samp{C} when it does not support the encoding, instead of failing.
  @item
  On Windows platforms (excluding Cygwin), @code{setlocale} understands different
  locale names, that are not based on ISO 639 language names and ISO 3166 country
  names.
  @item
  On Android < 5.0, which doesn't have locales, the @code{setlocale} function
  always fails.  The replacement, however, supports only the locale names
  @code{"C"} and @code{"POSIX"}.
  @end itemize
  
  Portability problems fixed by Gnulib module @code{setlocale} or @code{setlocale-null}:
  @itemize
  @item
  Invocations of @code{setlocale (..., NULL)} are not multithread-safe on some
  platforms:
  musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin.
  To make these invocations multithread-safe, you need the Gnulib module
  @code{setlocale}, or you need to change the code to invoke @code{setlocale_null}
  or @code{setlocale_null_r} instead.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  On Cygwin 1.5.x, which doesn't have locales,
  @code{setlocale(LC_ALL,NULL)} always returns @code{"C"}.
  @item
  On Cygwin 1.7.0, only the charset portion of a locale designation is honored.
  @item
  On OpenBSD, @code{setlocale(LC_ALL,"")} will only update categories that
  are deemed appropriate for the @code{LC_ALL} environment value, even if
  there are other categories set to different values in the environment.
  In addition any value is accepted for @code{LC_CTYPE}, and so NULL
  is never returned to indicate a failure to set locale.
  To verify category values, each category must be set individually
  with @code{setlocale(LC_COLLATE,"")} etc.
  @item
  On Android 5.0 and newer, the default locale (i.e.@: the locale in use when
  @code{setlocale} was not called) is the @code{"C.UTF-8"} locale, not the
  @code{"C"} locale.  Additionally, a @code{setlocale} call that is meant to set
  the @code{"C"} or @code{"POSIX"} locale actually sets an equivalent of the
  @code{"C.UTF-8"} locale.
  @end itemize
  

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