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	utfnlen.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	utfnlen.c (1111B)
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	1 /*
	2 * The authors of this software are Rob Pike and Ken Thompson.
	3 * Copyright (c) 2002 by Lucent Technologies.
	4 * Permission to use, copy, modify, and distribute this software for any
	5 * purpose without fee is hereby granted, provided that this entire noti…
	6 * is included in all copies of any software which is or includes a copy
	7 * or modification of this software and in all copies of the supporting
	8 * documentation for such software.
	9 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLI…
	10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES…
	11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABI…
	12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
	13 */
	14 #include <stdarg.h>
	15 #include <string.h>
	16 #include "plan9.h"
	17 #include "utf.h"
	18
	19 int
	20 utfnlen(char *s, long m)
	21 {
	22 int c;
	23 long n;
	24 Rune rune;
	25 char *es;
	26
	27 es = s + m;
	28 for(n = 0; s < es; n++) {
	29 c = (uchar)s;
	30 if(c < Runeself){
	31 if(c == '\0')
	32 break;
	33 s++;
	34 continue;
	35 }
	36 if(!fullrune(s, es-s))
	37 break;
	38 s += chartorune(&rune, s);
	39 }
	40 return n;
	41 }