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#include <u.h>
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#include <libc.h>
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char*
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strncat(char *s1, char *s2, long n)
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{
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	char *os1;
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	os1 = s1;
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	while(*s1++)
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		;
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	s1--;
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	while(*s1++ = *s2++)
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		if(--n < 0) {
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			s1[-1] = 0;
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			break;
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		}
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	return os1;
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}