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hyph: ignore multi-character hcode mappings

This patch ignores lines of the file specified as the third
argument of .hpf that contain more than two characters.  Reported
by Dirk-Wilhelm Peters <[email protected]>.

--- a/hyph.c

+++ b/hyph.c

@@ -264,7 +264,7 @@

 	if (args[3] && (filp = fopen(args[3], "r"))) {

 		while (fscanf(filp, "%s", tok) == 1) {

 			char *s = tok;

-			if (utf8read(&s, c1) && utf8read(&s, c2))

+			if (utf8read(&s, c1) && utf8read(&s, c2) && !*s)

 				hcode_add(c2, c1);	/* inverting */

 		}

 		fclose(filp);