Re: bug in completion/expansion of files with LANG=C

[Wayne Davison <wayned@users.sourceforge.net>]

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I looked around at the other calls to mbrtowc() in the code, and cleaned
up a few things:

1. I made all the code assign the return value to a size_t, not an int.
This should prevent a failure on a system where the size of an int is
larger than the size of a size_t (since the (size_t)-1 and (size_t)-2
values won't get converted into negative numbers if that is the case).

2. I added STOUC() around a couple char args that were getting passed to
nicechar() when mbrtowc() failed.

3. One of the calls needed to reset the mbstate_t object when continuing
to parse the string after mbrtowc() failed.

4. The code in sub_match() (in Src/Zle/compmatch.c) had a bug when it
assembled a wide-char value from multiple bytes (decoded from a metafied
string):  the code was not advancing past all the raw values used if
there was a meta char or a multibyte character sequence (and I think a
'\0' byte might have even looped infinitely).

After doing all that, it was time to begin looking at the next stage of
the non-inputable-filename problem: I decided to do the easiest possible
change first, so attached is a patch that causes zsh to insert a literal
question-mark in place of each errant character.  This allows me to at
least match a name that cannot be input into the command-line, but it
could be a little dangerous if it happens to match other filenames too,
so this is probably not something we'd want to use in an actual release.

..wayne..

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--- Src/Zle/zle_utils.c	9 Jan 2006 00:29:57 -0000	1.34
+++ Src/Zle/zle_utils.c	9 Jan 2006 01:20:35 -0000
@@ -277,13 +277,13 @@ stringaszleline(char *instr, int incs, i
 	while (ll > 0) {
 	    size_t ret = mbrtowc(outptr, inptr, ll, &ps);
 
-	    /*
-	     * At this point we don't handle either incomplete (-2) or
-	     * invalid (-1) multibyte sequences.  Use the current length
-	     * and return.
-	     */
-	    if (ret == (size_t)-1 || ret == (size_t)-2)
-		break;
+	    if (ret == (size_t)-1 || ret == (size_t)-2) {
+		/* Transform invalid character sequences into literal
+		 * question marks, at least for now... */
+		*outptr = L'?';
+		ret = 1;
+		memset(&ps, '\0', sizeof ps);
+	    }
 
 	    /*
 	     * Careful: converting a wide NUL returns zero, but we