/*
** fr_open
**
** open a file
**
** INPUT : filename - file to be opened
** mode - open method (r,w,a,r+,w+,a+)
** RETURN: pointer to a file descriptor or 0 on error
*/
F_FILE * fr_open ( const char * filename, const char * mode )
{
F_FILE * rc;
if( xSemaphoreTake( fs_lock_semaphore, F_MAX_LOCK_WAIT_TICKS ) == pdPASS )
{
rc = fn_open( filename, mode );
xSemaphoreGive( fs_lock_semaphore );
}
else
{
rc = NULL;
}
return rc;
}
/* Tries to detect whether FILE is a given type of file, by opening the file
and passing it to DETECT, and returns a detect_result. */
static enum detect_result
try_detect (const char *file_name, bool (*detect) (FILE *))
{
FILE *file;
bool is_type;
file = fn_open (file_name, "rb");
if (file == NULL)
{
msg (ME, _("An error occurred while opening `%s': %s."),
file_name, strerror (errno));
return ANY_ERROR;
}
is_type = detect (file);
fn_close (file_name, file);
return is_type ? ANY_YES : ANY_NO;
}
/****************************************************************************
*
* fn_truncate
*
* Open a file and set end of file
*
* INPUT: filename - name of the file
* filesize - required new size
* RETURN: NULL on error, otherwise file pointer
*
***************************************************************************/
F_FILE * fn_truncate ( const char * filename, long filesize )
{
F_FILE * f = fn_open( filename, "r+" );
unsigned char rc;
if ( f != NULL )
{
rc = _f_fseek( (long)gl_file.filesize );
if ( rc == F_NO_ERROR )
{
rc = _f_seteof( f, filesize );
}
if ( rc )
{
fn_close( f );
f = NULL;
}
}
return f;
} /* fn_truncate */
