From 7bf6bc9385adff81f0f66962630bdd60572d5c57 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Fri, 9 Oct 2020 18:15:36 +0200
Subject: cleanup

---
 .gitignore    |  1 +
 bcrypt-test.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/.gitignore b/.gitignore
index cf17be8..b64b38c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@ lua-bcrypt
 *.o
 bcrypt-test
 tags
+.tags
 user.db
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;
 }
+
+
+
-- 
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