ref: 9b62b35493ec9d39704ca6c9a9e133a2f8e980fc dir: /lib/c/src/isprint.c/
#define __USE_MACROS #include <ctype.h> #undef isprint int isprint(int c) { return (__ctype+1)[c] & (_P|_U|_L|_D|_SP); }