ref: 006fa02a5e8a78d11e6c4852cb726462660e9cc7
dir: /sys/src/libndb/ipattr.c/
#include <u.h> #include <ctype.h> /* * return ndb attribute type of an ip name */ char* ipattr(char *name) { char *p, c; int dot = 0; int alpha = 0; int colon = 0; int hex = 0; for(p = name; *p; p++){ c = *p; if(isdigit(c)) continue; if(isxdigit(c)) hex = 1; else if(isalpha(c) || c == '-') alpha = 1; else if(c == '.') dot = 1; else if(c == ':') colon = 1; else return "sys"; } if(alpha){ if(dot) return "dom"; else return "sys"; } if(colon) return "ip"; /* ip v6 */ if(dot && !hex) return "ip"; else return "sys"; }