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/* pwd.c - Try to approximate UN*X's getuser...() functions under MS-DOS.
Copyright (C) 1990 by Thorsten Ohl, td12@ddagsi3.bitnet
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details. */
/* This 'implementation' is conjectured from the use of this functions in
the RCS and BASH distributions. Of course these functions don't do too
much useful things under MS-DOS, but using them avoids many "#ifdef
MSDOS" in ported UN*X code ... */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
static char *lookup_env (char **);
/* where people might scribble their name into the environment ... */
static char *login_strings[] =
{
"LOGIN", "USER", "MAILNAME", (char *) 0
};
static char *group_strings[] =
{
"GROUP", (char *) 0
};
static char *anonymous = "anonymous"; /* if all else fails ... */
static char *home_dir = "."; /* we feel (no|every)where at home */
static char *login_shell = "not cmd.exe!";
static char *login = (char *) 0;/* cache the names here */
static char *group = (char *) 0;
static struct passwd pw; /* should we return a malloc()'d structure */
static struct group gr; /* instead of pointers to static structures? */
/* return something like a username in a (butchered!) passwd structure. */
struct passwd *
getpwuid (int uid)
{
pw.pw_name = getlogin ();
pw.pw_dir = home_dir;
pw.pw_shell = login_shell;
pw.pw_uid = 0;
return &pw;
}
struct passwd *
getpwnam (char *name)
{
return (struct passwd *) 0;
}
/* return something like a groupname in a (butchered!) group structure. */
struct group *
getgrgid (int uid)
{
gr.gr_name = getgr_name ();
gr.gr_gid = 0;
return &gr;
}
struct group *
getgrnam (char *name)
{
return (struct group *) 0;
}
/* return something like a username. */
char *
getlogin ()
{
if (!login) /* have we been called before? */
login = lookup_env (login_strings);
if (!login) /* have we been successful? */
login = anonymous;
return login;
}
/* return something like a group. */
char *
getgr_name ()
{
if (!group) /* have we been called before? */
group = lookup_env (group_strings);
if (!group) /* have we been successful? */
group = anonymous;
return group;
}
/* return something like a uid. */
int
getuid ()
{
return 0; /* every user is a super user ... */
}
int
getgid ()
{
return 0;
}
int
geteuid ()
{
return 0;
}
int
getegid ()
{
return 0;
}
struct passwd *
getpwent ()
{
return (struct passwd *) 0;
}
void
setpwent ()
{
}
void
endpwent ()
{
}
void
endgrent ()
{
}
/* return groups. */
int
getgroups (int ngroups, int *groups)
{
*groups = 0;
return 1;
}
/* lookup environment. */
static char *
lookup_env (char *table[])
{
char *ptr;
char *entry;
size_t len;
while (*table && !(ptr = getenv (*table++))) ; /* scan table */
if (!ptr)
return (char *) 0;
len = strcspn (ptr, " \n\t\n\r"); /* any WS? */
if (!(entry = malloc (len + 1)))
{
fprintf (stderr, "Out of memory.\nStop.");
exit (-1);
}
strncpy (entry, ptr, len);
entry[len] = '\0';
return entry;
}
/*
* Local Variables:
* mode:C
* ChangeLog:ChangeLog
* compile-command:make
* End:
*/
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