cleanup

1 files changed, 49 insertions, 6 deletions

diff --git a/bcrypt-test.c b/bcrypt-test.c
index 2bbdfe7..1df296d 100644
--- a/bcrypt-test.c
+++ b/bcrypt-test.c
@@ -8,6 +8,7 @@
 
 #define USER_DATABASE "./user.db"
 #define SECURITY_LEVEL 12
+#define SEP '|'
 
 static bool
 valid_char(int ch)
@@ -44,7 +45,7 @@ create_user(const char *username, const char *password)
                 return false;
         }
 
-        fprintf(db, "%s|%s\n", username, hash);
+        fprintf(db, "%s%c%s\n", username, SEP, hash);
         fclose(db);
 
         return true;
@@ -53,13 +54,13 @@ create_user(const char *username, const char *password)
 /**
  * Check is a valid username/password exists in the user-database
  *
- * \param[in] username
- * \param[in] password
+ * username A username
+ * password A strong password
  *
- * \return true, if the user was successfully authenticated, otherwise false
+ * @return true, if the user was successfully authenticated, otherwise false
  */
 bool
-check_user(const char *username, const char *password)
+check_user(const char *const username, const char *const password)
 {
         FILE *db = fopen(USER_DATABASE, "r");
         if ( db == NULL ) {
@@ -77,7 +78,7 @@ check_user(const char *username, const char *password)
                         continue;
                 }
 
-                if ( line[username_length] != '|' ) {
+                if ( line[username_length] != SEP ) {
                         continue;
                 }
 
@@ -94,6 +95,45 @@ check_user(const char *username, const char *password)
         return found;
 }
 
+/**
+ * Check if a valid username already exists in the user-database
+ *
+ * \param[in] username to be checked
+ *
+ * \return true, if the user was successfully authenticated, otherwise false
+ */
+bool
+check_user_if_exists(const char *username)
+{
+        FILE *db = fopen(USER_DATABASE, "r");
+        if ( db == NULL ) {
+                return false;
+        }
+
+        const size_t username_length = strlen(username);
+        char line[256];
+
+        bool found = false;
+        while ( !found && fgets(line, sizeof line, db) ) {
+                line[strcspn(line, "\r\n")] = '\0'; // remove newline (if exists)
+
+                if ( strncmp(line, username, username_length) != 0 ) {
+                        continue;
+                }
+
+                if ( line[username_length] != '|' ) {
+                        continue;
+                }
+
+                // User successfully authenticated!
+                found = true;
+        }
+
+        fclose(db);
+
+        return found;
+}
+
 int
 main(void)
 {
@@ -103,3 +143,6 @@ main(void)
 
         return EXIT_SUCCESS;
 }
+
+
+