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hyph: handle non-alpha ascii characters in hcode_mapchar()

--- a/hyph.c

+++ b/hyph.c

@@ -151,8 +151,8 @@

 	int i = dict_get(hcodedict, s);

 	if (i >= 0)

 		strcpy(s, hcodedst[i]);

-	else if (isalpha((unsigned char) *s))

-		*s = tolower(*s);

+	else if (!s[1])

+		*s = isalpha((unsigned char) *s) ? tolower((unsigned char) *s) : '.';

 	return strlen(s);

 }

--- a/wb.c

+++ b/wb.c

@@ -176,7 +176,7 @@

 			return 1;

 		if (!strcmp(c_bp, s))

 			continue;

-		if (!utf8one(s) || (!s[1] && !isalpha((unsigned char) s[0])))

+		if (!utf8one(s))

 			strcpy(d, ".");

 		else

 			strcpy(d, s);