git: 9front

ref: bc7d74f09b53c39ada4e73ce73c01c6c0928f9f4
dir: /sys/src/cmd/auth/lib/readarg.c/

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#include <u.h>
#include <libc.h>
#include <bio.h>
#include "authcmdlib.h"

int
readarg(int fd, char *arg, int len)
{
	char buf[1];
	int i;

	i = 0;
	memset(arg, 0, len);
	while(read(fd, buf, 1) == 1){
		if(i < len - 1)
			arg[i++] = *buf;
		if(*buf == '\0'){
			arg[i] = '\0';
			return 0;
		}
	}
	return -1;
}