diff options
Diffstat (limited to 'lib/printf-args.c')
| -rw-r--r-- | lib/printf-args.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/lib/printf-args.c b/lib/printf-args.c index 0ed1acbb8..761345622 100644 --- a/lib/printf-args.c +++ b/lib/printf-args.c @@ -1,5 +1,5 @@ /* Decomposed printf argument list. - Copyright (C) 1999, 2002-2003 Free Software Foundation, Inc. + Copyright (C) 1999, 2002-2003, 2005-2006 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -79,15 +79,40 @@ printf_fetchargs (va_list args, arguments *a) break; #ifdef HAVE_WINT_T case TYPE_WIDE_CHAR: - ap->a.a_wide_char = va_arg (args, wint_t); + /* Although ISO C 99 7.24.1.(2) says that wint_t is "unchanged by + default argument promotions", this is not the case in mingw32, + where wint_t is 'unsigned short'. */ + ap->a.a_wide_char = + (sizeof (wint_t) < sizeof (int) + ? va_arg (args, int) + : va_arg (args, wint_t)); break; #endif case TYPE_STRING: ap->a.a_string = va_arg (args, const char *); + /* A null pointer is an invalid argument for "%s", but in practice + it occurs quite frequently in printf statements that produce + debug output. Use a fallback in this case. */ + if (ap->a.a_string == NULL) + ap->a.a_string = "(NULL)"; break; #ifdef HAVE_WCHAR_T case TYPE_WIDE_STRING: ap->a.a_wide_string = va_arg (args, const wchar_t *); + /* A null pointer is an invalid argument for "%ls", but in practice + it occurs quite frequently in printf statements that produce + debug output. Use a fallback in this case. */ + if (ap->a.a_wide_string == NULL) + { + static const wchar_t wide_null_string[] = + { + (wchar_t)'(', + (wchar_t)'N', (wchar_t)'U', (wchar_t)'L', (wchar_t)'L', + (wchar_t)')', + (wchar_t)0 + }; + ap->a.a_wide_string = wide_null_string; + } break; #endif case TYPE_POINTER: |