From b9a4b77a40964fffbf18be45eeb13ab1bacafb56 Mon Sep 17 00:00:00 2001
From: "DLABAL, Eduard" <eduard.dlabal@edcs.cz>
Date: Fri, 25 Apr 2025 16:32:18 +0200
Subject: [PATCH] Add searchUUIDByName function to retrieve UUID by name and
 surname; improve formatting in users.c

---
 include/users.h | 16 ++++++++++--
 src/users.c     | 69 +++++++++++++++++++++++++++++++++++--------------
 2 files changed, 64 insertions(+), 21 deletions(-)

diff --git a/include/users.h b/include/users.h
index 9305191..204a0f1 100644
--- a/include/users.h
+++ b/include/users.h
@@ -42,7 +42,19 @@ typedef struct node
  */
 uint16_t generateUUID(node_t *_head);
 
-uint16_t searchUUIDByName(node_t *_head);
+/**
+ * @brief Searches for a UUID associated with a user by their name and surname.
+ *
+ * This function traverses a linked list of nodes to find a user whose name
+ * and surname match the provided parameters. If a match is found, it returns
+ * a pointer to the UUID associated with that user.
+ *
+ * @param _head Pointer to the head of the linked list.
+ * @param _name Pointer to a string containing the user's first name.
+ * @param _surname Pointer to a string containing the user's surname.
+ * @return Pointer to the UUID of the user if found, or 0 if no match is found.
+ */
+uint16_t *searchUUIDByName(node_t *_head, char *_name, char *_surname);
 
 /**
  * @brief Searches for a person in a linked list by their UUID.
@@ -68,7 +80,7 @@ node_t *searchPersonByUUID(node_t *_head, uint16_t _uuid);
  * @param _name Pointer to a string containing the person's first name.
  * @param _surname Pointer to a string containing the person's last name.
  * @param _department The department number to which the person belongs.
- * 
+ *
  * @return int Returns 1 if the person was successfully added, otherwise 0 on failure.
  *
  * @note Memory for the name and surname is dynamically allocated. It is the caller's
diff --git a/src/users.c b/src/users.c
index 3a5db1f..585148b 100644
--- a/src/users.c
+++ b/src/users.c
@@ -1,7 +1,6 @@
 #include "users.h"
 #include "main.h"
 
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <pthread.h>
@@ -11,10 +10,8 @@
 #include <termios.h>
 #include <string.h>
 
-uint16_t generateUUID
-(
-    node_t *_head
-)
+uint16_t generateUUID(
+    node_t *_head)
 {
     uint16_t uuid = rand() % (UINT16_MAX - 1 + 1) + 1;
     node_t *current = _head;
@@ -33,11 +30,9 @@ uint16_t generateUUID
     return uuid;
 }
 
-node_t *searchPersonByUUID
-(
+node_t *searchPersonByUUID(
     node_t *_head,
-    uint16_t _uuid
-)
+    uint16_t _uuid)
 {
     node_t *current = _head;
     while (current != NULL)
@@ -51,13 +46,51 @@ node_t *searchPersonByUUID
     return NULL;
 };
 
-int addPersonToList
-(
+uint16_t *searchUUIDByName(
+    node_t *_head,
+    char *_name,
+    char *_surname)
+{
+    int sum = 0;
+    uint16_t *uuids = malloc(sizeof(uint16_t));
+    node_t *current = _head;
+
+    if (_head == NULL)
+    {
+        return 0;
+    }
+
+    if (uuids == NULL)
+    {
+        puts("Fatal error: free memory is not sufficient for this operation");
+        exit(EXIT_FAILURE);
+    }
+
+    while (current != NULL)
+    {
+        if (strcmp(_name, current->user.name) == 0 && strcmp(_surname, current->user.surname) == 0)
+        {
+            sum++;
+
+            realloc(uuids, sum * sizeof(uint16_t));
+            if (uuids == NULL)
+            {
+                puts("Fatal error: free memory is not sufficient for this operation");
+                exit(EXIT_FAILURE);
+            }
+
+            uuids[sum - 1] = current->user.uuid;
+        }
+    }
+    if (sum == 0) return NULL;
+    return uuids;
+}
+
+int addPersonToList(
     node_t **_head,
     char *_name,
     char *_surname,
-    uint32_t _department
-)
+    uint32_t _department)
 {
     node_t *new_node = (node_t *)malloc(sizeof(node_t));
     if (new_node == NULL)
@@ -107,10 +140,8 @@ int addPersonToList
     return 1;
 }
 
-int addTimeEvent
-(
-    node_t *_person
-)
+int addTimeEvent(
+    node_t *_person)
 {
     time_t current_time = time(0);
 
@@ -124,8 +155,8 @@ int addTimeEvent
         _person->user.total += (current_time - _person->user.last_time_event);
     }
 
-    _person->user.available = !_person->user.available;  
-    _person->user.last_time_event = current_time;  
+    _person->user.available = !_person->user.available;
+    _person->user.last_time_event = current_time;
 
     return 1;
 }
\ No newline at end of file