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