getc_unlocked
int getc_unlocked(FILE *);
#define getchar_unlocked() getc_unlocked(stdin)
if (getc_unlocked(input) == EOF) {
extern int getc_unlocked(FILE *);
#define getchar_unlocked() getc_unlocked(stdin)
while ((i = getc_unlocked(fp)) != EOF) {
c = getc_unlocked(iop);
*s++ = getc_unlocked(stream);
#define getc(f) getc_unlocked(f)
switch (c = getc_unlocked(f)) {
c = getc_unlocked(f);
switch (c = getc_unlocked(f)) {
c = getc_unlocked(f);
TEST_NARROW(getc_unlocked(f));