| /* |
| * The authors of this software are Rob Pike and Ken Thompson. |
| * Copyright (c) 2002 by Lucent Technologies. |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose without fee is hereby granted, provided that this entire notice |
| * is included in all copies of any software which is or includes a copy |
| * or modification of this software and in all copies of the supporting |
| * documentation for such software. |
| * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE |
| * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY |
| * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. |
| */ |
| #include <stdarg.h> |
| #include <string.h> |
| #include "plan9.h" |
| #include "utf.h" |
| |
| int |
| utfnlen(char *s, long m) |
| { |
| int c; |
| long n; |
| Rune rune; |
| char *es; |
| |
| es = s + m; |
| for(n = 0; s < es; n++) { |
| c = *(uchar*)s; |
| if(c < Runeself){ |
| if(c == '\0') |
| break; |
| s++; |
| continue; |
| } |
| if(!fullrune(s, es-s)) |
| break; |
| s += chartorune(&rune, s); |
| } |
| return n; |
| } |