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1) If __SAPP stream is not seekable, remove __SAPP flag on first call instead

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of repeating unsuccessful lseek call on each write (original stdio bug).

2) Save errno accross _sseek call in _swrite to not touch it in case write
success (original stdio bug).

3) Add _sseek error checking back, but only for __SOPT mode now.
This commit is contained in:
ache 2001-09-07 17:16:02 +00:00
parent 170363780b
commit 5642ea6546
1 changed files with 10 additions and 3 deletions
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13
lib/libc/stdio/stdio.c
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@ -126,9 +126,15 @@ _swrite(fp, buf, n)
int n;
{
int ret;
int serrno;
if (fp->_flags & __SAPP)
(void)_sseek(fp, (fpos_t)0, SEEK_END);
if (fp->_flags & __SAPP) {
serrno = errno;
if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 &&
(fp->_flags & __SOPT))
return (-1);
errno = serrno;
}
ret = (*fp->_write)(fp->_cookie, buf, n);
/* __SOFF removed even on success in case O_APPEND mode is set. */
if (ret >= 0) {
@ -167,7 +173,8 @@ _sseek(fp, offset, whence)
if (errret == 0) {
fp->_flags |= __SERR;
errno = EINVAL;
}
} else if (errret == ESPIPE)
fp->_flags &= ~__SAPP;
fp->_flags &= ~__SOFF;
ret = -1;
} else if (fp->_flags & __SOPT) {