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