From ab6cbd925c8d5ac9fd80da8285cbb11e9e41fca8 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Sat, 11 Jul 2026 23:02:44 +0200
Subject: Variablen und Funktionen besser benamt.

---
 src/db-test.c | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

diff --git a/src/db-test.c b/src/db-test.c
index 1538702..97793f8 100644
--- a/src/db-test.c
+++ b/src/db-test.c
@@ -7,6 +7,7 @@
 // Berkeley DB 1.85
 #include <db.h>
 
+#define DATABASE_NAME "./database.db"
 #define MODE 0600
 
 #define USERNAME_LENGTH 20
@@ -31,9 +32,9 @@ insert(DB *database)
 		DBT data = { .data = &users[i], .size = sizeof(users[i]) };
 		DBT key  = { .data = users[i].username, .size = strlen(users[i].username) };
 
-		int res = database->put(database, &key, &data, 0);
-		if ( res == -1 ) {
-			(void) fprintf(stderr, "failed to insert data!\n");
+		int error = database->put(database, &key, &data, 0);
+		if ( error ) {
+			(void) fprintf(stderr, "Datensatz konnte nicht eingefügt werden!\n");
 		}
 	}
 }
@@ -44,9 +45,9 @@ update(DB *database, const char *username, int new_age)
 	DBT key = { .data = (void *) username, .size = strlen(username) };
 	DBT old_data;
 
-	int res = database->get(database, &key, &old_data, 0);
-	if ( res != 0 ) {
-		(void) fprintf(stderr, "update: Datensatz %s nicht gefunden!\n", username);
+	int error = database->get(database, &key, &old_data, 0);
+	if ( error ) {
+		(void) fprintf(stderr, "Datensatz %s nicht gefunden!\n", username);
 		return;
 	}
 
@@ -60,20 +61,21 @@ update(DB *database, const char *username, int new_age)
 		.size = sizeof user
 	};
 
-	res = database->put(database, &key, &new_data, 0);
+	error = database->put(database, &key, &new_data, 0);
 
-	if ( res != 0 ) {
-		(void) fprintf(stderr, "update: Datensatz %s wurde nicht aktualisiert\n", username);
+	if ( error ) {
+		(void) fprintf(stderr, "Datensatz %s wurde nicht aktualisiert\n", username);
 	}
 }
 
-void delete(DB *database, const char *username)
+void
+erase(DB *database, const char *username)
 {
 	DBT key = { .data = (void *) username, .size = strlen(username) };
 
-	int res = database->del(database, &key, 0);
-	if ( res != 0 ) {
-		(void) fprintf(stderr, "update: Datensatz %s wurde nicht gelöscht\n", username);
+	int error = database->del(database, &key, 0);
+	if ( error ) {
+		(void) fprintf(stderr, "Datensatz %s wurde nicht gelöscht\n", username);
 	}
 }
 
@@ -83,8 +85,8 @@ lookup(DB *database, const char *username)
 	DBT key = { .data = (void *) username, .size = strlen(username) };
 	DBT data;
 
-	int res = database->get(database, &key, &data, 0);
-	if ( res == 0 ) {
+	int error = database->get(database, &key, &data, 0);
+	if ( !error ) {
 		user_type *user = data.data;
 		printf("%.*s -> %s (%d)\n", (int) key.size, (char *) key.data, user->fullname, user->age);
 	}
@@ -96,19 +98,19 @@ list(DB *database)
 	DBT key;
 	DBT data;
 
-	int err = database->seq(database, &key, &data, R_FIRST);
-	while ( !err ) {
+	int error = database->seq(database, &key, &data, R_FIRST);
+	while ( !error ) {
 		user_type *user = data.data;
 		printf("%.*s -> %s (%d)\n", (int) key.size, (char *) key.data, user->fullname, user->age);
 
-		err = database->seq(database, &key, &data, R_NEXT);
+		error = database->seq(database, &key, &data, R_NEXT);
 	}
 }
 
 int
 main(void)
 {
-	DB *database = dbopen("./database.db", O_RDWR | O_CREAT, MODE, DB_BTREE, NULL);
+	DB *database = dbopen(DATABASE_NAME, O_RDWR | O_CREAT, MODE, DB_BTREE, NULL);
 	if ( database == NULL ) {
 		(void) fprintf(stderr, "Datenbank konnte nicht geöffnet werden\n");
 		return EXIT_FAILURE;
@@ -118,7 +120,7 @@ main(void)
 
 	lookup(database, "user1");
 
-	delete(database, "user1");
+	erase(database, "user1");
 
 	update(database, "datengott", 50);
 
-- 
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