mirror of
https://github.com/jart/cosmopolitan.git
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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 et 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.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/consts/s.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/thread.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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struct stat st;
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if (fstat(fd, &st))
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return 0;
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if ((f = __stdio_alloc())) {
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f->fd = fd;
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f->bufmode = S_ISREG(st.st_mode) ? _IOFBF : _IONBF;
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f->iomode = fopenflags(mode);
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f->buf = f->mem;
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f->size = BUFSIZ;
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if ((f->iomode & O_ACCMODE) != O_RDONLY) {
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__fflush_register(f);
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}
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return f;
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}
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return NULL;
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}
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