59 lines
2.8 KiB
C
59 lines
2.8 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.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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* Closes standard i/o stream and its underlying thing.
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*
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* @param f is the file object, which is always free if it's heap,
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* otherwise its resources are released and fields updated
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* @return 0 on success or -1 on error, which can be a trick for
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* differentiating between EOF and real errors during previous
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* i/o calls, without needing to call ferror()
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* @see fclose_s()
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*/
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int fclose(FILE *f) {
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int rc;
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if (!f) return 0; /* good java behavior; glibc crashes */
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_fflushunregister(f);
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fflush(f);
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free_s(&f->buf);
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f->state = EOF;
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if (f->noclose) {
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f->fd = -1;
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} else if (close_s(&f->fd) == -1) {
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f->state = errno;
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}
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if (f->state == EOF) {
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rc = 0;
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} else {
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errno = f->state;
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rc = EOF;
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}
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free_s(&f);
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return rc;
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}
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