Added EILSEQ, based on newsgroup post by Leith

include/errno.h

@@ -76,6 +76,7 @@ extern int errno;		  /* place where the error numbers go */
 #define ELOOP         (_SIGN 40)  /* too many levels of symlinks detected */
 #define ERESTART      (_SIGN 41)  /* driver restarted */
 #define EIDRM         (_SIGN 43)  /* Identifier removed */
+#define EILSEQ        (_SIGN 44)  /* illegal byte sequence */
 
 /* The following errors relate to networking. */
 #define EPACKSIZE     (_SIGN 50)  /* invalid packet size for some protocol */

lib/ansi/errlist.c

@@ -53,7 +53,7 @@ const char *_sys_errlist[] = {
 	"Driver restarted",		/* ERESTART */
 	unknown,			/* 42 */
 	"Identifier removed",		/* EIDRM */
-	unknown,			/* 44 */
+	"Illegal byte sequence",	/* EILSEQ */
 	unknown,			/* 45 */
 	unknown,			/* 46 */
 	unknown,			/* 47 */