Integrating library with application

AppIntegration/application.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  application.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  03/02/24 01:50:44 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#include "dll.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+/*Application specific data structures*/
+typedef struct person_{
+
+    char name[32];
+    int age;
+    int weight;
+} person_t;
+
+static void
+print_person_details(person_t *person){
+
+    printf("Name = %s\n",   person->name);
+    printf("Age = %d\n",    person->age);
+    printf("weight = %d\n", person->weight);
+}
+
+static void
+print_person_db(dll_t *person_db) {
+
+    if(!person_db || !person_db->head) return;
+
+    dll_node_t *head = person_db->head;
+    person_t *data = NULL;
+
+    while(head){
+        data = head->data;
+        print_person_details(data);
+        head = head->right;    
+    }
+}
+
+int 
+main(int argc, char **argv){
+
+    person_t *person1 = calloc(1, sizeof(person_t));
+    strncpy(person1->name, "Abhishek", strlen("Abhishek"));
+    person1->age = 31;
+    person1->weight = 75;
+    person_t *person2 = calloc(1, sizeof(person_t));
+    strncpy(person2->name, "Joseph", strlen("Joseph"));
+    person2->age = 41;
+    person2->weight = 70;
+    person_t *person3 = calloc(1, sizeof(person_t));
+    strncpy(person3->name, "Jack", strlen("Jack"));
+    person3->age = 29;
+    person3->weight = 55;
+
+    /*Create a new Linked List*/
+
+    dll_t *person_db = get_new_dll();
+    add_data_to_dll(person_db, person1);
+    add_data_to_dll(person_db, person2);
+    add_data_to_dll(person_db, person3);
+
+    print_person_db(person_db);
+    
+    return 0;
+}

AppIntegration/dll.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  dll.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  28/01/24 07:59:34 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+
+
+#include "dll.h"
+#include <memory.h>
+#include <stdlib.h>
+
+/* Public Function Implementation to create and return
+ * new empty doubly linked list*/
+
+dll_t *
+get_new_dll(){
+
+    dll_t *dll = calloc(1, sizeof(dll_t));
+    dll->head = NULL;
+    return dll;
+}
+
+/* Public Function Implementation to add a new application
+ *  * data to DLL */
+int
+add_data_to_dll (dll_t *dll, void *app_data){
+
+    if(!dll || !app_data) return -1;
+    
+    dll_node_t *dll_new_node = calloc(1, sizeof(dll_node_t));
+    dll_new_node->left = NULL;
+    dll_new_node->right = NULL;
+    dll_new_node->data = app_data;
+
+    /*Now add this to the front of DLL*/
+    if(!dll->head){
+        dll->head = dll_new_node;
+        return 0;
+    }
+
+    dll_node_t *first_node = dll->head;
+    dll_new_node->right = first_node;
+    first_node->left = dll_new_node;
+    dll->head = dll_new_node;
+    return 0;
+}
+

AppIntegration/dll.h

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  dll.h
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  28/01/24 07:58:51 PM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+
+/*Header file for Doubly Linked List*/
+
+typedef struct dll_node_{
+
+    void *data;
+    struct dll_node_ *left;
+    struct dll_node_ *right;
+} dll_node_t;
+
+typedef struct dll_{
+    dll_node_t *head;
+} dll_t;
+
+
+/* Public Function declaration to create and return
+ * a new empty doubly linked list*/
+dll_t *
+get_new_dll();
+
+/*  Public Function declaration to add the application
+ *  data to DLL*/
+int
+add_data_to_dll(dll_t *dll, void *app_data);
+
+
+/*More functions*/
+int  /*return 0 on success and -1 on failure*/
+remove_data_from_dll_by_data_ptr (dll_t *dll, void *data);
+
+/*return 0 if empty, -1 if not empty*/
+int
+is_dll_empty (dll_t *dll);
+
+/* delete all nodes from a dll, but do not free appln data*/
+void
+drain_dll (dll_t *dll);
+

AppIntegration/dll_util.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  dll_util.c
+ *
+ *    Description:  
+ *
+ *        Version:  1.0
+ *        Created:  03/02/24 11:35:26 AM IST
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  YOUR NAME (), 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+#include "dll.h"
+#include <memory.h>
+#include <stdlib.h>
+
+int
+remove_data_from_dll_by_data_ptr (dll_t *dll, void *data ){
+       
+     if( !dll || !dll->head || !data ) return -1;
+       
+      /* Searching for data linearly and deleting the data*/
+     dll_node_t *tp;
+     dll_node_t *temp = dll->head;
+     while( !temp ){
+       if( *((int *)temp->data) == *((int *)data) ){
+       tp = temp->left;
+       tp->right = temp->right;
+       free(temp);
+       return 0;
+     }
+     temp = temp->right;
+   }
+           
+   return -1;
+}
+               
+int
+is_dll_empty(dll_t *dll){
+                         
+   if( !dll || !dll->head ) return 0;
+                          
+   return -1;
+}
+
+
+void
+drain_dll (dll_t *dll){
+   if( !dll || !dll->head ) return;
+
+   dll_node_t *tp = dll->head;
+   dll_node_t * temp = dll->head;
+   while( tp != NULL ){
+        tp->right->left = NULL;
+        temp = tp->right;
+        tp->right = NULL;
+        free(tp->data);
+        free(tp);
+        tp = temp;
+   }
+
+}
+