mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
63a1636e1f
- Fix stdio fmemopen() buffer behaviors - Fix scanf() to return EOF when appropriate - Prefer fseek/ftell names over fseeko/ftello - Ensure locale field is always set in the TIB - Fix recent regression in vfprintf() return count - Make %n directive in scanf() have standard behavior
59 lines
2.7 KiB
C
59 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 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/errno.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/lock.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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static inline int64_t ftell_unlocked(FILE *f) {
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int64_t pos;
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uint32_t skew;
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if (f->fd != -1) {
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if (__fflush_impl(f) == -1) return -1;
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if ((pos = lseek(f->fd, 0, SEEK_CUR)) != -1) {
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if (f->beg < f->end) pos -= f->end - f->beg;
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return pos;
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} else {
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f->state = errno == ESPIPE ? EBADF : errno;
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return -1;
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}
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} else {
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return f->beg;
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}
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}
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/**
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* Returns current position of stream.
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*
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* @param stream is a non-null stream handle
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* @returns current byte offset from beginning, or -1 w/ errno
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* @threadsafe
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*/
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int64_t ftell(FILE *f) {
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int64_t rc;
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flockfile(f);
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rc = ftell_unlocked(f);
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funlockfile(f);
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return rc;
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}
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__strong_reference(ftell, ftello);
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