X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=doc%2Fposix-functions%2Fislower.texi;h=bfd347199f1083117fa1462e66251d12513b3857;hb=54b5ce0e1a4f6a4af37f970e45e6e173e5b0a1c6;hp=5972374af9fe1af2a14e04cab55f4c9b382aded4;hpb=2b6c08c775ae4e80b52aa41058ea5939f778b44b;p=gnulib.git

diff --git a/doc/posix-functions/islower.texi b/doc/posix-functions/islower.texi
index 5972374af..bfd347199 100644
--- a/doc/posix-functions/islower.texi
+++ b/doc/posix-functions/islower.texi
@@ -2,7 +2,7 @@
 @section @code{islower}
 @findex islower
 
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/islower.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/islower.html}
 
 Gnulib module: ---
 
@@ -13,3 +13,28 @@ Portability problems fixed by Gnulib:
 Portability problems not fixed by Gnulib:
 @itemize
 @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_islower
+This function operates in a locale independent way and returns true only for
+ASCII characters.  It is provided by the Gnulib module @samp{c-ctype}.
+
+@item iswlower
+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 mb_islower
+This function operates in a locale dependent way, on multibyte characters.
+It is provided by the Gnulib module @samp{mbchar}.
+
+@item uc_is_lower
+This function operates in a locale independent way, on Unicode characters.
+It is provided by the Gnulib module @samp{unictype/ctype-lower}.
+@end table