putc_unlocked
int putc_unlocked(int, FILE *);
#define putchar_unlocked(x) putc_unlocked(x, stdout)
#define fputc putc_unlocked
extern int putc_unlocked(int, FILE *);
#define putchar_unlocked(x) putc_unlocked((x), stdout)
ret = putc_unlocked(ch, iop);
while (--i >= 0 && putc_unlocked(*s++, stream) != EOF)
TEST_NARROW(putc_unlocked('c', f));