file_size.c

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/* file size */

#include "fb.h"

/*:::::*/
fb_off_t fb_FileSizeEx( FB_FILE *handle )
{
        fb_off_t res = 0;

        if( !FB_HANDLE_USED(handle) )
                return res;

        FB_LOCK();

        if (handle->hooks->pfnSeek!=NULL && handle->hooks->pfnTell!=NULL) {
                fb_off_t old_pos;
                /* remember old position */
                int result = handle->hooks->pfnTell(handle, &old_pos);
                if (result==0) {
                        /* move to end of file */
                        result = handle->hooks->pfnSeek(handle, 0, SEEK_END);
                }
                if (result==0) {
                        /* get size */
                        result = handle->hooks->pfnTell(handle, &res);
                        /* restore old position*/
                        handle->hooks->pfnSeek(handle, old_pos, SEEK_SET);
                }
        }

        FB_UNLOCK();

        return res;
}

/*:::::*/
FBCALL long long fb_FileSize( int fnum )
{
        return fb_FileSizeEx(FB_FILE_TO_HANDLE(fnum));
}