Show fseeko.c syntax highlighted
/*
* fseeko.c
* 64-bit versions of fseeko/ftello() for systems which do not have them
*/
#include "../config.h"
#if !defined(HAVE_FSEEKO) || !defined(HAVE_FTELLO)
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#endif
#ifdef WIN32
#define flockfile
#define funlockfile
#endif
/*
* On BSD/OS and NetBSD (and perhaps others), 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.
*/
#ifndef HAVE_FSEEKO
int
fseeko(FILE *stream, off_t offset, int whence)
{
fpos_t floc;
struct stat filestat;
switch (whence)
{
case SEEK_CUR:
flockfile(stream);
if (fgetpos(stream, &floc) != 0)
goto failure;
floc += offset;
if (fsetpos(stream, &floc) != 0)
goto failure;
funlockfile(stream);
return 0;
break;
case SEEK_SET:
if (fsetpos(stream, &offset) != 0)
return -1;
return 0;
break;
case SEEK_END:
flockfile(stream);
if (fstat(fileno(stream), &filestat) != 0)
goto failure;
floc = filestat.st_size;
if (fsetpos(stream, &floc) != 0)
goto failure;
funlockfile(stream);
return 0;
break;
default:
errno = EINVAL;
return -1;
}
failure:
funlockfile(stream);
return -1;
}
#endif
#ifndef HAVE_FTELLO
off_t
ftello(FILE *stream)
{
fpos_t floc;
if (fgetpos(stream, &floc) != 0)
return -1;
return floc;
}
#endif
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