ref: ea2d5f8dd91f10d96998aedcfbe22f21a9a73d1a 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); }