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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ 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; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/popcnt.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/errfuns.h"
/**
* Tunes buffering settings for an stdio stream.
*
* @param mode may be _IOFBF, _IOLBF, or _IONBF
* @param buf may optionally be non-NULL to set the stream's underlying
* buffer, which the stream will own, but won't free
* @param size must be a two power if buf is provided
* @return 0 on success or -1 on error
*/
int setvbuf(FILE *f, char *buf, int mode, size_t size) {
if (size && popcnt(size) != 1) return einval();
setbuffer(f, buf, size);
f->bufmode = mode;
return 0;
}