fseeko.c

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/*-------------------------------------------------------------------------
 *
 * fseeko.c
 *    64-bit versions of fseeko/ftello()
 *
 * Portions Copyright (c) 1996-2013, 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