47 lines
2.5 KiB
C
47 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=8 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/calls/calls.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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/**
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* Writes byte to stream.
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*
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* @return c (as unsigned char) if written or -1 w/ errno
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*/
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noinstrument int fputc(int c, FILE *f) {
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if (c != -1) {
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c &= 0xff;
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f->buf[f->end] = c;
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f->end = (f->end + 1) & (f->size - 1);
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if (unlikely(f->beg == f->end || f->bufmode == _IONBF ||
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(f->bufmode == _IOLBF && c == '\n'))) {
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if (f->writer) {
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return f->writer(f);
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} else if (f->beg == f->end) {
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return fseteof(f);
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}
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}
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return c;
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} else {
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return fseteof(f);
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}
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}
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