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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Felix Arends
*
* 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 the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <limits.h>
#include "system.h"
#include "file.h"
#include "vuprintf.h"
#define FPR_WRBUF_CKSZ 32 /* write buffer chunk size */
struct for_fprintf {
int fd; /* where to store it */
int rem; /* amount remaining */
int idx; /* index of next buffer write */
unsigned char wrbuf[FPR_WRBUF_CKSZ]; /* write buffer */
};
static int fpr_buffer_flush(struct for_fprintf *fpr)
{
/* set idx to actual but negative unflushed count to signal error */
ssize_t done = write(fpr->fd, fpr->wrbuf, fpr->idx);
fpr->idx = MAX(done, 0) - fpr->idx;
return fpr->idx;
}
static int fprfunc(void *pr, int letter)
{
struct for_fprintf *fpr = (struct for_fprintf *)pr;
if (fpr->idx >= FPR_WRBUF_CKSZ && fpr_buffer_flush(fpr)) {
return -1; /* don't count this one */
}
fpr->wrbuf[fpr->idx++] = letter;
return --fpr->rem;
}
int fdprintf(int fd, const char *fmt, ...)
{
int bytes;
struct for_fprintf fpr;
va_list ap;
fpr.fd = fd;
fpr.rem = INT_MAX;
fpr.idx = 0;
va_start(ap, fmt);
bytes = vuprintf(fprfunc, &fpr, fmt, ap);
va_end(ap);
/* flush any tail bytes */
if (fpr.idx < 0 || fpr_buffer_flush(&fpr)) {
bytes += fpr.idx; /* adjust for unflushed bytes */
}
return bytes;
}
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