Use it for the actual I/O only. Previously, defining CONFIG_UTF8 and
enabling UTF-8 used to force many strings to the UTF-8 charset
regardless of the terminal charset option. Now, those strings always
follow the terminal charset. This fixes bug 914 which was caused
because _() returned strings in the terminal charset and functions
then assumed they were in UTF-8. This reduction in the effects of
UTF-8 I/O may also simplify future testing.
If CONFIG_UTF8 is not defined, then text_end is not used, and GCC
could warn about that. Because configure can add -Werror to CFLAGS,
the warning could then cause the whole build to fail.
If utf8_char2cells isn't told where the string that contains
the given UTF-8 character ends, it computes that itself. Two users
of utf8_char2cells, format_textutf8 and split_line, were calling
utf8_char2cells in a loop without providing the end of the string,
resulting in numerous calls by utf8_char2cells to strlen.
With this patch, format_textutf8 and split_line each find the end
of the string once and provide it to utf8_char2cells.
This particularly improves performance with textareas, since
format_textutf8 is called multiple times each time the user interacts
with the textarea and when it must be redrawn.
Closes: Bug 823 - Big textarea is too slow with CONFIG_UTF8
The configure script no longer recognizes "CONFIG_UTF_8=yes" lines
in custom features.conf files. They will have to be changed to
"CONFIG_UTF8=yes". This incompatibility was deemed acceptable
because no released version of ELinks supports CONFIG_UTF_8.
The --enable-utf-8 option was not renamed.
To reproduce before this patch:
- Run ELinks with an 80x25 terminal.
- Set document.browse.forms.confirm_submit = 1.
- Go to <http://bugzilla.elinks.cz/query.cgi>.
- Click the [ Search ] submit button.
- ELinks asks "Do you want to post form data to URL".
Each line of the URL begins at the horizontal center of the dialog,
and bleeds outside the right border of the dialog. Also, the
[ Yes ] and [ No ] buttons appear to float below the dialog.
Preparation for using struct terminal in formating functions.
By now distinguish between formating widgets and formating widgets with
displaying was done with term == NULL and term != NULL. I hope I'am
not wrong.
