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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Gary Czvitkovicz
*
* 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 <stdio.h>
#include <limits.h>
#include <errno.h>
#include "vuprintf.h"
/* ALSA library requires a more advanced snprintf, so let's not
override it in simulator for Linux. Note that Cygwin requires
our snprintf or it produces garbled output after a while. */
struct for_snprintf {
char *ptr; /* where to store it */
int rem; /* unwritten buffer remaining */
};
static int sprfunc(void *ptr, int letter)
{
struct for_snprintf *pr = (struct for_snprintf *)ptr;
if (pr->rem > 0) {
if (--pr->rem == 0) {
return 0;
}
*pr->ptr++ = letter;
return 1;
}
else {
if (pr->rem == -INT_MAX) {
pr->rem = 1;
return -1;
}
--pr->rem;
return 1;
}
}
int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
{
if (size <= INT_MAX) {
int bytes;
struct for_snprintf pr;
pr.ptr = buf;
pr.rem = size;
bytes = vuprintf(sprfunc, &pr, fmt, ap);
if (size) {
*pr.ptr = '\0';
}
else if (pr.rem > 0) {
goto overflow;
}
return bytes;
}
overflow:
errno = EOVERFLOW;
return -1;
}
int snprintf(char *buf, size_t size, const char *fmt, ...)
{
if (size <= INT_MAX) {
int bytes;
struct for_snprintf pr;
va_list ap;
pr.ptr = buf;
pr.rem = size;
va_start(ap, fmt);
bytes = vuprintf(sprfunc, &pr, fmt, ap);
va_end(ap);
if (size) {
*pr.ptr = '\0';
}
else if (pr.rem > 0) {
goto overflow;
}
return bytes;
}
overflow:
errno = EOVERFLOW;
return -1;
}
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