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38 lines
2.5 KiB
38 lines
2.5 KiB
/*-*- 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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