dev_file_eof.c

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/* detects EOF for file device */

#include "fb.h"

int fb_DevFileEof( FB_FILE *handle )
{
    int res;
    FILE *fp;

        FB_LOCK();

    fp = (FILE*) handle->opaque;

        if( fp == NULL )
        {
                FB_UNLOCK();
                return FB_TRUE;
        }

    res = FB_FALSE;

    switch( handle->mode )
    {
    /* non-text mode? */
    case FB_FILE_MODE_BINARY:
    case FB_FILE_MODE_RANDOM:
        /* note: handle->putback_size will be checked by fb_FileEofEx() */
        res = ( ftell( fp ) >= handle->size? FB_TRUE : FB_FALSE );
        break;

    /* text-mode (INPUT, OUTPUT or APPEND) */
    default:
        /* try feof() first, because the EOF char (27) */
        if( feof( fp ) )
        {
                res = FB_TRUE;
        }
                /* if in input mode, feof() won't return TRUE if file_pos == file_size */
                else if( handle->mode == FB_FILE_MODE_INPUT )
                {
                int has_size = handle->hooks->pfnTell!=NULL && handle->hooks->pfnSeek!=NULL;
                /* note: fseek() is unreliable in text-mode, size must be calculated
                         re-opening the file in binary mode */
                if( has_size )
                        if( ftell( fp ) >= handle->size )
                        res = FB_TRUE;
        }
    }

        FB_UNLOCK();

        return res;
}