From a850dccbb51315fa67b88b6e31bcd629534c6c41 Mon Sep 17 00:00:00 2001
From: Daniel Ryzhuk <daniel.ryzhuk@student.tuke.sk>
Date: Thu, 5 Nov 2020 08:40:20 +0000
Subject: [PATCH] Upload files to 'cv5'

---
 cv5/a_train.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 cv5/a_train.c

diff --git a/cv5/a_train.c b/cv5/a_train.c
new file mode 100644
index 0000000..574dd1d
--- /dev/null
+++ b/cv5/a_train.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "a_train.h"
+
+
+struct car *add_car(struct car *first, const char *target)
+{
+    struct car *curr_car = (struct car*) calloc(1, sizeof(struct car));
+    strcpy(curr_car -> value, target);
+    curr_car -> next = NULL;
+    if (first == NULL)
+    {
+        // create list if necessary
+        return curr_car;
+    }
+    // add car to the end
+    struct car *prev_car = first;
+    while (prev_car -> next != NULL)
+    {
+        prev_car = prev_car -> next;
+    }
+    prev_car -> next = curr_car;
+    return first;
+}
+
+
+void print_train(struct car *first)
+{
+    struct car *curr_car = first;
+    while (curr_car != NULL)
+    {
+        printf("%s\n", curr_car -> value);
+        curr_car = curr_car -> next;
+    }
+}
+
+
+void cancel_train(struct car *first)
+{
+    if (first == NULL)
+    {
+        return;
+    }
+    cancel_train(first->next);
+    free(first);
+}
+
+
+struct car *clear_train(struct car *first, const char *target)
+{
+    if (first == NULL)
+    {
+        return NULL;
+    }
+    if (strcmp(first -> value, target) == 0)
+    {
+        struct car *answer = first -> next;
+        free(first);
+        return answer;
+    }
+
+    struct car *prev_car = first;
+    struct car *curr_car = first -> next;
+    if (prev_car == NULL)
+    {
+        return first;
+    }
+    while ((prev_car -> next) != NULL) {
+        curr_car = prev_car -> next;
+        if(curr_car == NULL)
+        {
+            break;
+        }
+        // if found target
+        if (strcmp(curr_car -> value, target) == 0)
+        {
+            // remove it and continue
+            struct car *next_car = curr_car -> next;
+            free(curr_car);
+            prev_car -> next = next_car;
+            prev_car = next_car;
+        }
+        else
+        {
+            prev_car = curr_car;
+        }
+        if (prev_car == NULL)
+        {
+            break;
+        }
+    }
+    return first;
+}