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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/cmd/unix/drawterm/libc/utfnlen.c – Rev 2

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#include <u.h>
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#include <libc.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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}