ref: 3c2cec93a9475a27f854ac2541f69c4a7a0b3657 dir: /lib/c/isprint.c/
#define __USE_MACROS #include <ctype.h> #undef isprint int isprint(int c) { return (__ctype+1)[c] & (_P|_U|_L|_D|_SP); }