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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"
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#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/errfuns.h"
/**
* Sets buffer on stdio stream.
*/
void setbuffer(FILE *f, char *buf, size_t size) {
if (size && popcnt(size) != 1) abort();
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if (buf && f->buf != (unsigned char *)buf) {
free_s(&f->buf);
if (!size) size = BUFSIZ;
f->buf = (unsigned char *)buf;
}
if (size) {
f->size = size;
}
}