Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/needsrcquote/needsrcquote.c
#include <u.h> #include <libc.h> int needsrcquote(int c) { if(c <= ' ') return 1; if(c < 0x80 && strchr("`^#*[]=|\\?${}()'<>&;", c)) return 1; return 0; }
