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 */

#ifndef APR_USER_H
#define APR_USER_H

#include "apr.h"
#include "apr_errno.h"
#include "apr_pools.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @file apr_user.h
 * @brief APR User ID Services 
 */
/**
 * @defgroup APR_User User id services
 * @ingroup APR
 * @{
 */

/**
 * Structure for determining user ownership.
 */
#ifdef WIN32
typedef PSID                      apr_uid_t;
#else
typedef uid_t                     apr_uid_t;
#endif

/**
 * Structure for determining group ownership.
 */
#ifdef WIN32
typedef PSID                      apr_gid_t;
#else
typedef gid_t                     apr_gid_t;
#endif

#if APR_HAS_USER 

/**
 * Get the userid (and groupid) of the calling process
 * @param userid   Returns the user id
 * @param groupid  Returns the user's group id
 * @param p The pool from which to allocate working space
 * @remark This function is available only if APR_HAS_USER is defined.
 */
APR_DECLARE(apr_status_t) apr_current_userid(apr_uid_t *userid,
                                             apr_gid_t *groupid,
                                             apr_pool_t *p);

/**
 * Get the user name for a specified userid
 * @param username Pointer to new string containing user name (on output)
 * @param userid The userid
 * @param p The pool from which to allocate the string
 * @remark This function is available only if APR_HAS_USER is defined.
 */
APR_DECLARE(apr_status_t) apr_get_username(char **username, apr_uid_t userid, apr_pool_t *p);

/**
 * Get the userid (and groupid) for the specified username
 * @param userid   Returns the user id
 * @param groupid  Returns the user's group id
 * @param username The username to lookup
 * @param p The pool from which to allocate working space
 * @remark This function is available only if APR_HAS_USER is defined.
 */
APR_DECLARE(apr_status_t) apr_get_userid(apr_uid_t *userid, apr_gid_t *groupid,
                                         const char *username, apr_pool_t *p);

/**
 * Get the home directory for the named user
 * @param dirname Pointer to new string containing directory name (on output)
 * @param username The named user
 * @param p The pool from which to allocate the string
 * @remark This function is available only if APR_HAS_USER is defined.
 */
APR_DECLARE(apr_status_t) apr_get_home_directory(char **dirname, const char *username, apr_pool_t *p);

/**
 * Compare two user identifiers for equality.
 * @param left One uid to test
 * @param right Another uid to test
 * @return APR_SUCCESS if the apr_uid_t strutures identify the same user,
 * APR_EMISMATCH if not, APR_BADARG if an apr_uid_t is invalid.
 * @remark This function is available only if APR_HAS_USER is defined.
 */
#if defined(WIN32)
APR_DECLARE(apr_status_t) apr_compare_users(apr_uid_t left, apr_uid_t right);
#else
#define apr_compare_users(left,right) (((left) == (right)) ? APR_SUCCESS : APR_EMISMATCH)
#endif

/**
 * Get the group name for a specified groupid
 * @param groupname Pointer to new string containing group name (on output)
 * @param groupid The groupid
 * @param p The pool from which to allocate the string
 * @remark This function is available only if APR_HAS_USER is defined.
 */
APR_DECLARE(apr_status_t) apr_get_groupname(char **groupname, apr_gid_t groupid, apr_pool_t *p);

/**
 * Get the groupid for a specified group name
 * @param groupid Pointer to the group id (on output)
 * @param groupname The group name to look up
 * @param p The pool from which to allocate the string
 * @remark This function is available only if APR_HAS_USER is defined.
 */
APR_DECLARE(apr_status_t) apr_get_groupid(apr_gid_t *groupid, const char *groupname, apr_pool_t *p);

/**
 * Compare two group identifiers for equality.
 * @param left One gid to test
 * @param right Another gid to test
 * @return APR_SUCCESS if the apr_gid_t strutures identify the same group,
 * APR_EMISMATCH if not, APR_BADARG if an apr_gid_t is invalid.
 * @remark This function is available only if APR_HAS_USER is defined.
 */
#if defined(WIN32)
APR_DECLARE(apr_status_t) apr_compare_groups(apr_gid_t left, apr_gid_t right);
#else
#define apr_compare_groups(left,right) (((left) == (right)) ? APR_SUCCESS : APR_EMISMATCH)
#endif

#endif  /* ! APR_HAS_USER */

/** @} */
#ifdef __cplusplus
}
#endif

#endif  /* ! APR_USER_H */
