Re: Unicode, Korean, normalization form, Mac OS X and tab completion

[Bart Schaefer <schaefer@brasslantern.com>]

On Jun 2,  2:00am, Jun T. wrote:
} Subject: Re: Unicode, Korean, normalization form, Mac OS X and tab complet
}
} There is a patch by a Japanese user which simply converts
} file names obtained by readder() into the composed form ("NFC")

I tried this and found a couple of problems, mainly that iconv() can
return >= 0 but do nothing if the input has no convertible characters.
Here is my suggested correction, also eliminates unnecessary temp_name:

diff --git a/Src/utils.c b/Src/utils.c
index 9439227..8b512bb 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -4270,6 +4270,12 @@ mod_export char *
 zreaddir(DIR *dir, int ignoredots)
 {
     struct dirent *de;
+#if defined(HAVE_ICONV) && defined(__APPLE__)
+    static iconv_t conv_ds = (iconv_t)0;
+    static char *conv_name = 0;
+    char *conv_name_ptr, *orig_name_ptr;
+    size_t conv_name_len, orig_name_len;
+#endif
 
     do {
 	de = readdir(dir);
@@ -4278,6 +4284,31 @@ zreaddir(DIR *dir, int ignoredots)
     } while(ignoredots && de->d_name[0] == '.' &&
 	(!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2])));
 
+#if defined(HAVE_ICONV) && defined(__APPLE__)
+    if (!conv_ds)
+	conv_ds = iconv_open("UTF-8", "UTF-8-MAC");
+    if (conv_ds) {
+	/* Force initial state in case re-using conv_ds */
+	(void) iconv(conv_ds, 0, &orig_name_len, 0, &conv_name_len);
+
+	orig_name_ptr = de->d_name;
+	orig_name_len = strlen(de->d_name);
+	conv_name = zrealloc(conv_name, orig_name_len+1);
+	conv_name_ptr = conv_name;
+	conv_name_len = orig_name_len;
+	if (iconv(conv_ds,
+		  &orig_name_ptr, &orig_name_len,
+		  &conv_name_ptr, &conv_name_len) >= 0) {
+	  if (orig_name_len == 0) {
+	    /* Completely converted, metafy and return */
+	    *conv_name_ptr = '\0';
+	    return metafy(conv_name, -1, META_STATIC);
+	  }
+	}
+	/* Error, or conversion incomplete, keep the original name */
+    }
+#endif
+
     return metafy(de->d_name, -1, META_STATIC);
 }