Simple R5 style pwd function implementation, courtesy of Eli Green.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7332 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/posix/pwd.c

@@ -1,62 +1,134 @@
 /* 
-** Copyright 2002, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Copyright 2002-2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Copyright 2004, Eli Green, eli@earthshattering.org. All rights reserved.
 ** Distributed under the terms of the OpenBeOS License.
 */
 
+/*
+** All the functions in this file return the "baron" user.
+** baron is uid 0, gid 0. the pw_name field is set to either
+** "baron" or the value of the USER environment variable.
+**
+** This is done to be fully compatible with BeOS R5. /etc/passwd
+** is not consulted.
+**
+** One difference:
+** R5's getpwnam always returns NULL, but the implementation in this
+** file returns passwd struct for baron if the name argument is set to
+** the USER environment variable, or "baron" if USER is unset.
+**
+** The reentrant versions do not exist under BeOS R5.
+*/
+
 
 #include <pwd.h>
-#include <syscalls.h>
+#include <stdlib.h>
 #include <string.h>
-#include <errno.h>
 
 
-// ToDo: implement pwd stuff for real!
+static char _pw_first = 1;
+static struct passwd _pw_struct;
+
+
+static char *
+get_user_name()
+{
+	char *user = getenv("USER");
+	if (user != NULL)
+		return user;
+
+	return "baron";
+}
+
+
+static void
+getbaron(struct passwd *pw)
+{
+	pw->pw_name = get_user_name();
+	pw->pw_passwd = "";
+	pw->pw_uid = 0;
+	pw->pw_gid = 0;
+	pw->pw_dir = "/boot/home";
+	pw->pw_shell = "/bin/sh";
+	pw->pw_gecos = "system";
+}
 
 
 struct passwd *
 getpwent(void)
 {
-	return NULL;
+	if (!_pw_first)
+		return NULL;
+
+	_pw_first = 0;
+
+	getbaron(&_pw_struct);
+	return &_pw_struct;
 }
 
 
 void
 setpwent(void)
 {
+	_pw_first = 1;
 }
 
 
 void
 endpwent(void)
 {
+	_pw_first = 1;
 }
 
 
 struct passwd *
 getpwnam(const char *name)
 {
+	if (!strcmp(name, get_user_name())) {
+		getbaron(&_pw_struct);
+		return &_pw_struct;
+	}
+
 	return NULL;
 }
 
 
 int
 getpwnam_r(const char *name, struct passwd *passwd, char *buffer,
-	size_t bufferSize, struct passwd **result)
+	size_t bufferSize, struct passwd **_result)
 {
-	return -1;
+	if (strcmp(name, get_user_name())) {
+		*_result = NULL;
+		return 0;
+	}
+
+	getbaron(passwd);
+	*_result = passwd;
+	return 0;
 }
 
 
 struct passwd *
 getpwuid(uid_t uid)
 {
-	return NULL;
+	if (uid != 0)
+		return NULL;
+
+	getbaron(&_pw_struct);
+	return &_pw_struct;
 }
 
 
 int
 getpwuid_r(uid_t uid, struct passwd *passwd, char *buffer,
-	size_t bufferSize, struct passwd **result)
+	size_t bufferSize, struct passwd **_result)
 {
-	return -1;
+	if (uid != 0) {
+		*_result = NULL;
+		return 0;
+	}
+
+	getbaron(passwd);
+	*_result = passwd;
+	return 0;
 }