* check.t: add new regression test "typeset-padding-1" according to TFM

* edit.c: remove debug stuff again; next time better use shl.c functions ;)
* sh.h: add format attributes to a few shf functions
* histrap.c, var.c: fix format string mistakes
* main.c, sh.h: error_prefix and warningf take bool not int
* misc.c: make chvt() stuff use shf_* functions
* misc.c: rewrite the TIOCSTTY stuff to be better integrated in mksh,
  since it originally was an external patch
* misc.c: chvt() no longer fails if e.g. chown fails due to e.g. R/O / fs
* var.c: fix typeset padding for right-justified zero-filled

main.c

@@ -13,7 +13,7 @@
 #include <locale.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/main.c,v 1.52 2006/11/09 22:08:07 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/main.c,v 1.53 2006/11/10 01:13:51 tg Exp $");
 
 extern char **environ;
 
@@ -758,7 +758,7 @@ errorf(const char *fmt, ...)
 
 /* like errorf(), but no unwind is done */
 void
-warningf(int fileline, const char *fmt, ...)
+warningf(bool fileline, const char *fmt, ...)
 {
 	va_list va;
 
@@ -820,7 +820,7 @@ internal_errorf(int jump, const char *fmt, ...)
 
 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
 void
-error_prefix(int fileline)
+error_prefix(bool fileline)
 {
 	/* Avoid foo: foo[2]: ... */
 	if (!fileline || !source || !source->file ||