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#include <u.h>
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#include <libc.h>
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Rune*
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runestrecpy(Rune *s1, Rune *es1, Rune *s2)
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{
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	if(s1 >= es1)
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		return s1;
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	while(*s1++ = *s2++){
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		if(s1 == es1){
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			*--s1 = '\0';
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			break;
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		}
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	}
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	return s1;
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}