No, fputcsv() only encloses the field under the following conditions
/* enclose a field that contains a delimiter, an enclosure character, or a newline */
if (FPUTCSV_FLD_CHK(delimiter) ||
FPUTCSV_FLD_CHK(enclosure) ||
FPUTCSV_FLD_CHK(escape_char) ||
FPUTCSV_FLD_CHK('\n') ||
FPUTCSV_FLD_CHK('\r') ||
FPUTCSV_FLD_CHK('\t') ||
FPUTCSV_FLD_CHK(' ')
)
There is no “always enclose” option.