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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 "config.h"
#include "pwd.h"
#include "xalloc.h"
static char *lookup_env (char **);
/* where people might scribble their name into the environment ... */
static char *login_strings[] =
{
"LOGIN", "USER", "MAILNAME", "USERNAME", NULL
};
static char *group_strings[] =
{
"GROUP", NULL
};
static char *anonymous = "anonymous"; /* if all else fails ... */
static char *login = NULL;/* cache the names here */
static char *group = NULL;
static struct passwd pw; /* should we return a malloc()'d structure */
static struct group gr; /* instead of pointers to static structures? */
/* implement limited uid behavior */
#define my_fake_uid ((const uid_t) 4545)
#define my_fake_gid my_fake_uid
/* return something like a username in a (butchered!) passwd structure. */
struct passwd *
getpwuid (int uid)
{
pw.pw_name = getlogin ();
pw.pw_dir = woe32_home_dir ();
pw.pw_shell = woe32_shell ();
pw.pw_uid = 0;
return &pw;
}
struct passwd *
getpwnam (const char *name)
{
return NULL;
}
/* 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 (const char *name)
{
return NULL;
}
/* return something like a username. */
char *
getlogin (void)
{
/* This is how a windows user would override their login name. */
if (!login)
login = lookup_env (login_strings);
/* In the absence of user override, ask the operating system. */
if (!login)
login = woe32_getlogin ();
/* If all else fails, fall back on Old Faithful. */
if (!login)
login = anonymous;
return login;
}
/* return something like a group. */
char *
getgr_name (void)
{
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. */
uid_t
getuid (void)
{
return my_fake_uid;
}
gid_t
getgid (void)
{
return my_fake_gid;
}
uid_t
geteuid (void)
{
return my_fake_uid;
}
gid_t
getegid (void)
{
return my_fake_gid;
}
struct passwd *
getpwent (void)
{
return NULL;
}
void
setpwent (void)
{
}
void
endpwent (void)
{
}
void
endgrent (void)
{
}
/* return groups. */
int
getgroups (int ngroups, gid_t *groups)
{
if (ngroups > 0)
*groups = my_fake_gid;
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 NULL;
len = strcspn (ptr, " \n\t\n\r"); /* any WS? */
if (!(entry = xmalloc (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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