112 lines
2.6 KiB
C
112 lines
2.6 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 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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#include <stdio.h>
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#include <limits.h>
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#include <errno.h>
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#include "vuprintf.h"
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/* ALSA library requires a more advanced snprintf, so let's not
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override it in simulator for Linux. Note that Cygwin requires
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our snprintf or it produces garbled output after a while. */
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struct for_snprintf {
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char *ptr; /* where to store it */
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int rem; /* unwritten buffer remaining */
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};
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static int sprfunc(void *ptr, int letter)
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{
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struct for_snprintf *pr = (struct for_snprintf *)ptr;
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if (pr->rem > 0) {
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if (--pr->rem == 0) {
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return 0;
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}
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*pr->ptr++ = letter;
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return 1;
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}
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else {
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if (pr->rem == -INT_MAX) {
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pr->rem = 1;
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return -1;
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}
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--pr->rem;
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return 1;
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}
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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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if (size <= INT_MAX) {
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int bytes;
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struct for_snprintf pr;
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pr.ptr = buf;
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pr.rem = size;
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bytes = vuprintf(sprfunc, &pr, fmt, ap);
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if (size) {
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*pr.ptr = '\0';
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}
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else if (pr.rem > 0) {
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goto overflow;
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}
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return bytes;
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}
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overflow:
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errno = EOVERFLOW;
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return -1;
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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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if (size <= INT_MAX) {
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int bytes;
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struct for_snprintf pr;
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va_list ap;
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pr.ptr = buf;
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pr.rem = size;
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va_start(ap, fmt);
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bytes = vuprintf(sprfunc, &pr, fmt, ap);
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va_end(ap);
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if (size) {
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*pr.ptr = '\0';
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}
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else if (pr.rem > 0) {
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goto overflow;
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}
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return bytes;
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}
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overflow:
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errno = EOVERFLOW;
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return -1;
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}
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