putchar            25 ext/nkf/nkf.c  #undef putchar
putchar            28 ext/nkf/nkf.c  #define putchar(c)      rb_nkf_putchar(c)
putchar           114 include/ruby/win32.h #undef putchar
putchar           123 include/ruby/win32.h #define putchar(_c)		rb_w32_putc(_c, stdout)