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Use addargs() in sftp plus some clean up of addargs().  OK Markus

/*	$OpenBSD: misc.h,v 1.6 2001/05/08 19:45:24 mouring Exp $	*/

/*
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 */
/* remove newline at end of string */
char	*chop(char *s);

/* return next token in configuration line */
char	*strdelim(char **s);

/* set filedescriptor to non-blocking */
void	set_nonblock(int fd);

struct passwd * pwcopy(struct passwd *pw);

/*
 * Convert ASCII string to TCP/IP port number.
 * Port must be >0 and <=65535.
 * Return 0 if invalid.
 */
int a2port(const char *s);

/* code from scp.c/rcp.c */
char *cleanhostname(char *host);
char *colon(char *cp);

/* function to assist building execv() arguments */
typedef struct arglist arglist;
struct arglist {
        char    **list;
        int     num;
        int     nalloc;
};

void addargs(arglist *args, char *fmt, ...) __attribute__((format(printf, 2, 3)));