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i bet a lot of people didn't know what ssh 1.2.16 had a nice license.
well, except for the patent issues.  someone in sweden (forget their
name at the moment) cleaned out most of the patented code, and now
this code removes rsa code.  when this is done, it will link against
libssl, but the work isn't completely done yet.  then we need to bring
this up to modern days, featurewise.

/*

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 1.1 1999/09/26 20:53:38 deraadt 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);


  /* Skiop 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;
}