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/*-------------------------------------------------------------------------
*
* fseeko.c
* 64-bit versions of fseeko/ftello()
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/port/fseeko.c,v 1.17.4.1 2005/08/12 00:29:22 momjian Exp $
*
*-------------------------------------------------------------------------
*/
/*
* We have to use the native defines here because configure hasn't
* completed yet.
*/
#if defined(__bsdi__) || defined(__NetBSD__)
#include "c.h"
#ifdef bsdi
#include <pthread.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
/*
* On BSD/OS and 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.
*
* This is thread-safe on BSD/OS using flockfile/funlockfile.
*/
int
fseeko(FILE *stream, off_t offset, int whence)
{
off_t floc;
struct stat filestat;
switch (whence)
{
case SEEK_CUR:
#ifdef bsdi
flockfile(stream);
#endif
if (fgetpos(stream, &floc) != 0)
goto failure;
floc += offset;
if (fsetpos(stream, &floc) != 0)
goto failure;
#ifdef bsdi
funlockfile(stream);
#endif
return 0;
break;
case SEEK_SET:
if (fsetpos(stream, &offset) != 0)
return -1;
return 0;
break;
case SEEK_END:
#ifdef bsdi
flockfile(stream);
#endif
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;
#ifdef bsdi
funlockfile(stream);
#endif
return 0;
break;
default:
errno = EINVAL;
return -1;
}
failure:
#ifdef bsdi
funlockfile(stream);
#endif
return -1;
}
off_t
ftello(FILE *stream)
{
off_t floc;
if (fgetpos(stream, &floc) != 0)
return -1;
return floc;
}
#endif
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