46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Felix Arends
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __VUPRINTF_H__
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#define __VUPRINTF_H__
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#include <stdarg.h>
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/* callback function is called for every output character (byte) in the
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* output with userp
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*
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* it must return > 0 to continue (increments counter)
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* it may return 0 to stop (increments counter)
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* it may return < 0 to stop (does not increment counter)
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* a zero in the format string stops (does not increment counter)
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*
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* caller is reponsible for stopping formatting in order to keep the return
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* value from overflowing (assuming they have a reason to care)
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*/
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typedef int (* vuprintf_push_cb)(void *userp, int c);
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/*
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* returns the number of times push() was called and returned >= 0
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*/
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int vuprintf(vuprintf_push_cb push, void *userp, const char *fmt, va_list ap);
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#endif /* __VUPRINTF_H__ */
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