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KNF part 1

/*

tildexpand.c

Author: Tatu Ylonen <ylo@cs.hut.fi>

Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                   All rights reserved

Created: Wed Jul 12 01:07:36 1995 ylo

*/

#include "includes.h"
RCSID("$Id: tildexpand.c,v 1.3 1999/11/23 22:25:56 markus Exp $");

#include "xmalloc.h"
#include "ssh.h"

/* Expands tildes in the file name.  Returns data allocated by xmalloc.
   Warning: this calls getpw*. */

char *
tilde_expand_filename(const char *filename, uid_t my_uid)
{
	const char *cp;
	unsigned int userlen;
	char *expanded;
	struct passwd *pw;
	char user[100];

	/* Return immediately if no tilde. */
	if (filename[0] != '~')
		return xstrdup(filename);

	/* Skip the tilde. */
	filename++;

	/* Find where the username ends. */
	cp = strchr(filename, '/');
	if (cp)
		userlen = cp - filename;	/* Have something after username. */
	else
		userlen = strlen(filename);	/* Nothign after username. */
	if (userlen == 0)
		pw = getpwuid(my_uid);	/* Own home directory. */
	else {
		/* Tilde refers to someone elses home directory. */
		if (userlen > sizeof(user) - 1)
			fatal("User name after tilde too long.");
		memcpy(user, filename, userlen);
		user[userlen] = 0;
		pw = getpwnam(user);
	}
	/* Check that we found the user. */
	if (!pw)
		fatal("Unknown user %100s.", user);

	/* If referring to someones home directory, return it now. */
	if (!cp) {		/* Only home directory specified */
		return xstrdup(pw->pw_dir);
	}
	/* Build a path combining the specified directory and path. */
	expanded = xmalloc(strlen(pw->pw_dir) + strlen(cp + 1) + 2);
	sprintf(expanded, "%s/%s", pw->pw_dir, cp + 1);
	return expanded;
}