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For "a"-mode files and rewind/fseek + fwrite combination return meaningful

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value now, like Apple does, but avoid their __sflush physical write
performance degradation as much as possible.
This commit is contained in:
Andrey A. Chernov 2014-07-22 22:49:37 +00:00
parent d0999e70b6
commit ecf84bf00a
1 changed files with 18 additions and 0 deletions
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18
lib/libc/stdio/ftell.c
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@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include "un-namespace.h"
@ -87,6 +88,7 @@ _ftello(FILE *fp, fpos_t *offset)
{
fpos_t pos;
size_t n;
int dflags;
if (fp->_seek == NULL) {
errno = ESPIPE; /* historic practice */
@ -118,6 +120,22 @@ _ftello(FILE *fp, fpos_t *offset)
if (HASUB(fp))
pos -= fp->_r; /* Can be negative at this point. */
} else if ((fp->_flags & __SWR) && fp->_p != NULL) {
dflags = 0;
if (fp->_flags & __SAPP)
dflags = O_APPEND;
else if (fp->_file != -1 &&
(dflags = _fcntl(fp->_file, F_GETFL)) < 0)
return (1);
if ((dflags & O_APPEND) &&
(pos = _sseek(fp, (fpos_t)0, SEEK_END)) == -1) {
if ((fp->_flags & __SOPT) || __sflush(fp) ||
(pos = _sseek(fp, (fpos_t)0, SEEK_CUR)) == -1)
return (1);
else {
*offset = pos;
return (0);
}
}
/*
* Writing. Any buffered characters cause the
* position to be greater than that in the