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libc: update stream getoffset to handle write case

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Change-Id: I80b01b446446d5a631d40822f220a0177a95e7e6
Signed-off-by: liuhaitao <liuhaitao@xiaomi.com>
This commit is contained in:
liuhaitao 2021-03-19 12:12:32 +08:00 committed by Xiang Xiao
parent dc14f89909
commit bcaf5d75e5
1 changed files with 12 additions and 8 deletions
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20
libs/libc/stdio/lib_ftell.c
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@ -37,7 +37,7 @@
****************************************************************************/
/****************************************************************************
* Name: lib_getrdoffset
* Name: lib_getoffset
*
* Description:
* It is insufficient to simply use the file offset; we must also account
@ -50,9 +50,9 @@
****************************************************************************/
#ifndef CONFIG_STDIO_DISABLE_BUFFERING
static off_t lib_getrdoffset(FAR FILE *stream)
static off_t lib_getoffset(FAR FILE *stream)
{
off_t rdoffset = 0;
off_t offset = 0;
lib_take_semaphore(stream);
if (stream->fs_bufstart !=
@ -60,18 +60,22 @@ static off_t lib_getrdoffset(FAR FILE *stream)
stream->fs_bufstart)
{
#if CONFIG_NUNGET_CHARS > 0
rdoffset = stream->fs_bufread - stream->fs_bufpos +
offset = stream->fs_bufread - stream->fs_bufpos +
stream->fs_nungotten;
#else
rdoffset = stream->fs_bufread - stream->fs_bufpos;
offset = stream->fs_bufread - stream->fs_bufpos;
#endif
}
else
{
offset = -(stream->fs_bufpos - stream->fs_bufstart);
}
lib_give_semaphore(stream);
return rdoffset;
return offset;
}
#else
# define lib_getrdoffset(stream) (0)
# define lib_getoffset(stream) (0)
#endif
/****************************************************************************
@ -109,7 +113,7 @@ long ftell(FAR FILE *stream)
position = lseek(stream->fs_fd, 0, SEEK_CUR);
if (position != (off_t)-1)
{
return (long)(position - lib_getrdoffset(stream));
return (long)(position - lib_getoffset(stream));
}
else
{