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| author | Bruno Haible <bruno@clisp.org> | 2023-05-16 02:02:13 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2023-05-16 02:02:13 +0200 |
| commit | 8c4d0fbf4c45df8e86acbb338b154930c5498dc3 (patch) | |
| tree | 5401c85ea991c90093b1b2ab1d0afa6f0d0d6c60 /doc/posix-functions/tolower.texi | |
| parent | f3059fb80504e1f4e1e4c34562508f404ce7b0f7 (diff) | |
| download | gnulib-8c4d0fbf4c45df8e86acbb338b154930c5498dc3.tar.gz | |
doc: New chapter "Strings and Characters".
* doc/strings.texi: New file.
* doc/gnulib.texi (POSIXURL): New variable.
(posixheader, posixfunc, func): New macros, from GNU libunistring's
documentation.
Include strings.texi.
(Particular Modules): Don't include c-locale.texi here.
* doc/c-locale.texi: Sections become subsections, subsections become
subsubsections.
* doc/posix-functions/isalnum.texi: Mention c32isalnum.
* doc/posix-functions/isalpha.texi: Mention c32isalpha.
* doc/posix-functions/isblank.texi: Mention c32isblank.
* doc/posix-functions/iscntrl.texi: Mention c32iscntrl.
* doc/posix-functions/isdigit.texi: Mention c32isdigit.
* doc/posix-functions/isgraph.texi: Mention c32isgraph.
* doc/posix-functions/islower.texi: Mention c32islower.
* doc/posix-functions/isprint.texi: Mention c32isprint.
* doc/posix-functions/ispunct.texi: Mention c32ispunct.
* doc/posix-functions/isspace.texi: Mention c32isspace.
* doc/posix-functions/isupper.texi: Mention c32isupper.
* doc/posix-functions/isxdigit.texi: Mention c32isxdigit.
* doc/posix-functions/tolower.texi: Mention alternative APIs.
* doc/posix-functions/toupper.texi: Likewise.
* doc/posix-functions/towlower.texi: Mention c32tolower.
* doc/posix-functions/towupper.texi: Mention c32toupper.
* doc/posix-functions/wcswidth.texi: Mention c32swidth.
* doc/posix-functions/wcwidth.texi: Mention c32width.
Diffstat (limited to 'doc/posix-functions/tolower.texi')
| -rw-r--r-- | doc/posix-functions/tolower.texi | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/doc/posix-functions/tolower.texi b/doc/posix-functions/tolower.texi index d8d2bf7f06..9911b7fb0c 100644 --- a/doc/posix-functions/tolower.texi +++ b/doc/posix-functions/tolower.texi @@ -16,7 +16,32 @@ OS X 10.8. Portability problems not fixed by Gnulib: @itemize -@item -On Windows and 32-bit AIX platforms, @code{wchar_t} is a 16-bit type and therefore cannot -accommodate all Unicode characters. @end itemize + +Note: This function's behaviour depends on the locale, but does not support +the multibyte characters that occur in strings in locales with +@code{MB_CUR_MAX > 1} (this includes all the common UTF-8 locales). +There are four alternative APIs: + +@table @code +@item c_tolower +This function operates in a locale independent way and returns a different +value than the argument only for uppercase ASCII characters. It is provided +by the Gnulib module @samp{c-ctype}. + +@item towlower +This function operates in a locale dependent way, on wide characters. In +order to use it, you first have to convert from multibyte to wide characters, +using the @code{mbrtowc} function. It is provided by the Gnulib module +@samp{wctype}. + +@item c32tolower +This function operates in a locale dependent way, on 32-bit wide characters. +In order to use it, you first have to convert from multibyte to 32-bit wide +characters, using the @code{mbrtoc32} function. It is provided by the +Gnulib module @samp{c32tolower}. + +@item uc_tolower +This function operates in a locale independent way, on Unicode characters. +It is provided by the Gnulib module @samp{unicase/tolower}. +@end table |