all: rename functions, deprecate old ones

Rename get_by_* to user_by_* and get_all to users. users() now can return errors.

pwd.c.v

@@ -76,7 +76,14 @@ fn make_error(name string, uid int) IError {
 
 // get_by_uid returns the passwd database entry by user ID.
 // If the entry is not found, the EntryNotFoundError error will be returned.
+@[deprecated: 'use user_by_uid() instead']
 pub fn get_by_uid(uid int) !Passwd {
+	return user_by_uid(uid)!
+}
+
+// user_by_uid returns the passwd database entry by user ID.
+// If the entry is not found, the EntryNotFoundError error will be returned.
+pub fn user_by_uid(uid int) !Passwd {
 	pwd_mutex.lock()
 	defer {
 		pwd_mutex.unlock()
@@ -88,9 +95,16 @@ pub fn get_by_uid(uid int) !Passwd {
 	return make_passwd(pw)
 }
 
-// get_by_uid returns the passwd database entry by user name.
+// get_by_name returns the passwd database entry by user name.
 // If the entry is not found, the EntryNotFoundError error will be returned.
+@[deprecated: 'use user_by_name() instead']
 pub fn get_by_name(name string) !Passwd {
+	return user_by_name(name)!
+}
+
+// user_by_name returns the passwd database entry by user name.
+// If the entry is not found, the EntryNotFoundError error will be returned.
+pub fn user_by_name(name string) !Passwd {
 	pwd_mutex.lock()
 	defer {
 		pwd_mutex.unlock()
@@ -103,7 +117,13 @@ pub fn get_by_name(name string) !Passwd {
 }
 
 // get_all returns all entries from passwd database in arbitrary order.
+@[deprecated: 'use users() instead']
 pub fn get_all() []Passwd {
+	return users() or { []Passwd{} }
+}
+
+// users returns all entries from passwd database in arbitrary order.
+pub fn users() ![]Passwd {
 	mut pwds := []Passwd{}
 	pwd_mutex.lock()
 	C.setpwent()
@@ -113,6 +133,10 @@ pub fn get_all() []Passwd {
 	}
 	for {
 		pw := C.getpwent()
+		err := make_error('', -1)
+		if err.code() != 0 {
+			return err
+		}
 		if isnil(pw) {
 			break
 		}