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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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/*
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 * BUG: supposed to be for effective uid,
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 * but plan9 doesn't have that concept
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 */
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char *
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cuserid(char *s)
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{
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	char *logname;
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	static char buf[L_cuserid];
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	if((logname = getlogin()) == NULL)
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		return(NULL);
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	if(s == 0)
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		s = buf;
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	strncpy(s, logname, sizeof buf);
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	return(s);
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}