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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/stdio/fclose.c Normal file
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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=8 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/assert.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/internal.h"
#include "libc/stdio/stdio.h"
/**
* Closes standard i/o stream and its underlying thing.
*
* @param f is the file object, which is always free if it's heap,
* otherwise its resources are released and fields updated
* @return 0 on success or -1 on error, which can be a trick for
* differentiating between EOF and real errors during previous
* i/o calls, without needing to call ferror()
* @see fclose_s()
*/
int fclose(FILE *f) {
int rc;
if (!f) return 0; /* good java behavior; glibc crashes */
fflushunregister(f);
fflush(f);
free_s(&f->buf);
f->state = EOF;
if (f->noclose) {
f->fd = -1;
} else if (close_s(&f->fd) == -1) {
f->state = errno;
}
if (f->state == EOF) {
rc = 0;
} else {
errno = f->state;
rc = EOF;
}
free_s(&f);
return rc;
}