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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include "authcmdlib.h"
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int
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readarg(int fd, char *arg, int len)
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{
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	char buf[1];
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	int i;
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	i = 0;
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	memset(arg, 0, len);
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	while(read(fd, buf, 1) == 1){
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		if(i < len - 1)
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			arg[i++] = *buf;
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		if(*buf == '\0'){
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			arg[i] = '\0';
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			return 0;
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		}
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	}
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	return -1;
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}