_IO_putc
extern int _IO_putc(int c, _IO_FILE *stream);
int sputc(int c) { return _IO_putc(c, this); }
return _IO_putc (__c, stdout);
extern int _IO_putc (int __c, _IO_FILE *__fp);
libc_hidden_def (_IO_putc)
weak_alias (_IO_putc, putc)
weak_alias (_IO_putc, putc_unlocked)
#define putc(_ch, _fp) _IO_putc (_ch, _fp)