mirror of
https://github.com/jart/cosmopolitan.git
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3e4fd4b0ad
This change also pays off some of the remaining technical debt with stdio, file descriptors, and memory managemnt polyfills.
53 lines
2.7 KiB
C
53 lines
2.7 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/mem/mem.h"
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#include "libc/stdio/internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Allocates stream object for already-opened file descriptor.
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*
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* @param fd existing file descriptor or -1 for plain old buffer
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* @param mode is passed to fopenflags()
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* @return new stream or NULL w/ errno
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* @error ENOMEM
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*/
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FILE *fdopen(int fd, const char *mode) {
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FILE *f;
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if ((f = calloc(1, sizeof(FILE)))) {
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f->fd = fd;
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f->reader = __freadbuf;
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f->writer = __fwritebuf;
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f->bufmode = ischardev(fd) ? _IOLBF : _IOFBF;
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f->iomode = fopenflags(mode);
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f->size = BUFSIZ;
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if ((f->buf = valloc(f->size))) {
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if ((f->iomode & O_ACCMODE) != O_RDONLY) {
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_fflushregister(f);
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}
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return f;
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}
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free(f);
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}
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return NULL;
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}
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