Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/libc/port/needsrcquote.c
#include <u.h> #include <libc.h> int needsrcquote(int c) { if(c <= ' ') return 1; if(utfrune("`^#*[]=|\\?${}()'<>&;", c)) return 1; return 0; }
