81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
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/***************************************************************************
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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 Gary Czvitkovicz
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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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/*
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* Minimal printf and snprintf formatting functions
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*
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* These support %c %s %l %d %u and %x(%p)
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* Field width and zero-padding flag only
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <limits.h>
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#include "format.h"
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struct for_snprintf {
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unsigned char *ptr; /* where to store it */
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size_t bytes; /* amount already stored */
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size_t max; /* max amount to store */
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};
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static int sprfunc(void *ptr, unsigned char letter)
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{
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struct for_snprintf *pr = (struct for_snprintf *)ptr;
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if(pr->bytes < pr->max) {
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*pr->ptr = letter;
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pr->ptr++;
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pr->bytes++;
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return true;
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}
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return false; /* filled buffer */
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}
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int snprintf(char *buf, size_t size, const char *fmt, ...)
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{
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int len;
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va_list ap;
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va_start(ap, fmt);
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len = vsnprintf(buf, size, fmt, ap);
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va_end(ap);
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return len;
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}
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
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{
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struct for_snprintf pr;
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pr.ptr = (unsigned char *)buf;
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pr.bytes = 0;
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pr.max = size;
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format(sprfunc, &pr, fmt, ap);
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/* make sure it ends with a trailing zero */
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pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
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return pr.bytes;
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}
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