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fix for incorrect (partial) written sequences when libc wcwidth() == -1

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Fix an issue with incorrect (partial) written sequences when libc wcwidth() ==
-1. The sequence is updated to on wcwidth(u) == -1:

	c = "\357\277\275"

but len isn't.

A way to reproduce in practise:

* st -o dump.txt
* In the terminal: printf '\xcd\xb8'
- This is codepoint 888, on OpenBSD it reports wcwidth() == -1.
- Quit the terminal.
- Look in dump.txt (partial written sequence of "UTF_INVALID").

This was introduced in:

"	commit 11625c7166
	Author: czarkoff@gmail.com <czarkoff@gmail.com>
	Date:   Tue Oct 28 12:55:28 2014 +0100

	    Replace character with U+FFFD if wcwidth() is -1

	    Helpful when new Unicode codepoints are not recognized by libc."

Change:

Remove setting the sequence. If this happens to break something, another
solution could be setting len = 3 for the sequence.
This commit is contained in:
Hiltjo Posthuma 2020-05-09 13:56:28 +02:00
parent 87545c612e
commit 8211e36d28
1 changed files with 1 additions and 3 deletions
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4
st.c
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@ -2312,11 +2312,9 @@ tputc(Rune u)
width = len = 1; width = len = 1;
} else { } else {
len = utf8encode(u, c); len = utf8encode(u, c);
if (!control && (width = wcwidth(u)) == -1) { if (!control && (width = wcwidth(u)) == -1)
memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
width = 1; width = 1;
} }
}
if (IS_SET(MODE_PRINT)) if (IS_SET(MODE_PRINT))
tprinter(c, len); tprinter(c, len);