fn_getc
while (c = fn_getc(srcfnp))
int fn_getc(struct fn *fnp);
while ((c = fn_getc(fnp)) != '\0')
while ((c = fn_getc(src)) != '\0')
switch (c = fn_getc(src)) {
fn_putc(kw, fn_getc(src));
if ((c = fn_getc(src)) == 'E' || c == 'O') {
c = fn_getc(src);
tbuf[1] = fn_getc(src);
tbuf[2] = fn_getc(src);