mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
d5910e2673
- Fixed bug where stdio eof wasn't being sticky - Fixed bug where fseeko() wasn't clearing eof state - Removed assert() usage from libc favoring _unassert() / _npassert()
46 lines
2.7 KiB
C
46 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=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 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/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/stdio/lock.internal.h"
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#include "libc/stdio/stdio.h"
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/**
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* Repositions open file stream.
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*
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* This function flushes the buffer (unless it's currently in the EOF
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* state) and then calls lseek() on the underlying file. If the stream
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* is in the EOF state, this function can be used to restore it without
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* needing to reopen the file.
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*
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* @param f is a non-null stream handle
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* @param offset is the byte delta
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* @param whence can be SEET_SET, SEEK_CUR, or SEEK_END
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* @returns 0 on success or -1 on error
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* @threadsafe
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*/
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int fseeko(FILE *f, int64_t offset, int whence) {
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int rc;
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flockfile(f);
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rc = fseeko_unlocked(f, offset, whence);
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STDIOTRACE("fseeko(%p, %'ld, %s) → %d %s", f, offset, DescribeWhence(whence),
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rc, DescribeStdioState(f->state));
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funlockfile(f);
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return rc;
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}
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