greenplumn fseeko 源码
greenplumn fseeko 代码
文件路径：/src/port/fseeko.c
/*-------------------------------------------------------------------------
*
* fseeko.c
* 64-bit versions of fseeko/ftello()
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/fseeko.c
*
*-------------------------------------------------------------------------
*/
/*
* We have to use the native defines here because configure hasn't
* completed yet.
*/
#ifdef __NetBSD__
#include "c.h"
#include <sys/stat.h>
/*
* On NetBSD, off_t and fpos_t are the same. Standards
* say off_t is an arithmetic type, but not necessarily integral,
* while fpos_t might be neither.
*/
int
fseeko(FILE *stream, off_t offset, int whence)
{
off_t floc;
struct stat filestat;
switch (whence)
{
case SEEK_CUR:
if (fgetpos(stream, &floc) != 0)
goto failure;
floc += offset;
if (fsetpos(stream, &floc) != 0)
goto failure;
return 0;
break;
case SEEK_SET:
if (fsetpos(stream, &offset) != 0)
return -1;
return 0;
break;
case SEEK_END:
fflush(stream); /* force writes to fd for stat() */
if (fstat(fileno(stream), &filestat) != 0)
goto failure;
floc = filestat.st_size;
floc += offset;
if (fsetpos(stream, &floc) != 0)
goto failure;
return 0;
break;
default:
errno = EINVAL;
return -1;
}
failure:
return -1;
}
off_t
ftello(FILE *stream)
{
off_t floc;
if (fgetpos(stream, &floc) != 0)
return -1;
return floc;
}
#endif
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