Refined some of the bugs of gets() and freed the memory

calc_file.h → calc_file.c

@@ -1,67 +1,67 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-void calc()
-{
-    char type;
-    printf("Enter d for decimal operations and i for integer operation: ");
-    scanf("%c", &type);
-    if (type == 'i')
-    {
-        getchar();
-        int a, b;
-        printf("Enter first number: ");
-        scanf("%d", &a);
-        printf("Enter second number: ");
-        scanf("%d", &b);
-        char o;
-        printf("Enter operation(+, -, /, *): ");
-        getchar();
-        scanf("%c", &o);
-        if (o == '+')
-        {
-            printf("%d\n\n", a + b);
-        }
-        else if (o == '-')
-        {
-            printf("%d\n\n", a - b);
-        }
-        else if (o == '*')
-        {
-            printf("%d\n\n", a * b);
-        }
-        else if (o == '/')
-        {
-            printf("%d\n\n", a / b);
-        }
-    }
-    else
-    {
-        getchar();
-        float x, y;
-        printf("Enter first number: ");
-        scanf("%f", &x);
-        printf("Enter second number: ");
-        scanf("%f", &y);
-        char o;
-        printf("Enter operation(+, -, /, *): ");
-        getchar();
-        scanf("%c", &o);
-        if (o == '+')
-        {
-            printf("%.2f\n\n", x + y);
-        }
-        else if (o == '-')
-        {
-            printf("%.2f\n\n", x - y);
-        }
-        else if (o == '*')
-        {
-            printf("%.2f\n\n", x * y);
-        }
-        else if (o == '/')
-        {
-            printf("%.2f\n\n", x / y);
-        }
-    }
+#include <stdio.h>
+#include <stdlib.h>
+
+void calc()
+{
+    char type;
+    printf("Enter d for decimal operations and i for integer operation: ");
+    scanf("%c", &type);
+    if (type == 'i')
+    {
+        getchar();
+        int a, b;
+        printf("Enter first number: ");
+        scanf("%d", &a);
+        printf("Enter second number: ");
+        scanf("%d", &b);
+        char o;
+        printf("Enter operation(+, -, /, *): ");
+        getchar();
+        scanf("%c", &o);
+        if (o == '+')
+        {
+            printf("%d\n\n", a + b);
+        }
+        else if (o == '-')
+        {
+            printf("%d\n\n", a - b);
+        }
+        else if (o == '*')
+        {
+            printf("%d\n\n", a * b);
+        }
+        else if (o == '/')
+        {
+            printf("%d\n\n", a / b);
+        }
+    }
+    else
+    {
+        getchar();
+        float x, y;
+        printf("Enter first number: ");
+        scanf("%f", &x);
+        printf("Enter second number: ");
+        scanf("%f", &y);
+        char o;
+        printf("Enter operation(+, -, /, *): ");
+        getchar();
+        scanf("%c", &o);
+        if (o == '+')
+        {
+            printf("%.2f\n\n", x + y);
+        }
+        else if (o == '-')
+        {
+            printf("%.2f\n\n", x - y);
+        }
+        else if (o == '*')
+        {
+            printf("%.2f\n\n", x * y);
+        }
+        else if (o == '/')
+        {
+            printf("%.2f\n\n", x / y);
+        }
+    }
 }

ccwd_file.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "change_dir_path.c" //including the change_dir_path.h to get the variable change_dir.
+#include <dirent.h>
+#include <unistd.h>
+
+void ccwd()
+{
+    printf("Enter the path to change this directory to: \n");
+    getchar();
+    fgets(change_dir, 100, stdin);
+    change_dir[strlen(change_dir) - 1] = 0;
+    if (chdir(change_dir) == 0) //implementing chdir function.
+    {
+        printf("successfully changed\n");
+    }
+    else
+    {
+        printf("Cannot change the directory.\n");
+    }
+}

change_dir_path.h → change_dir_path.c

@@ -1,4 +1,4 @@
-#include <stdio.h>
-#include <stdlib.h>
-
+#include <stdio.h>
+#include <stdlib.h>
+
 char change_dir[100];//assigning at least 100 characters to the new directory name entered by user.

change_root.h → change_root.c

@@ -1,24 +1,28 @@
-#include <stdio.h>
-#include <string.h>
-
-
-//function to change the username and password
-void change(){
-    char username_new[10], password_new[10];
-    int i =0;
-    getchar();
-    printf("Now you can change the username and password.\n");
-    printf("Enter new username-");
-    gets(username_new);//new username
-    printf("Enter new password-");
-    gets(password_new);//new password
-    FILE *new_user;
-    FILE *new_password;
-    //writing in the files the new username and password
-    new_user = fopen("root_username.txt", "w");
-    new_password = fopen("password_root.txt", "w");
-    fprintf(new_user, username_new);
-    fprintf(new_password, password_new);
-    fclose(new_user);
-    fclose(new_password);
+#include <stdio.h>
+#include <string.h>
+
+
+//function to change the username and password
+void change(){
+    char username_new[10], password_new[10];
+    int i =0;
+    getchar();
+    printf("Now you can change the username and password.\n");
+    printf("Enter new username-");
+    fgets(username_new, 10, stdin);//new username
+    username_new[strlen(username_new) - 1] = 0;
+
+    printf("Enter new password-");
+    fgets(password_new, 10, stdin);//new password
+    password_new[strlen(password_new) - 1] = 0;
+
+    FILE *new_user;
+    FILE *new_password;
+    //writing in the files the new username and password
+    new_user = fopen("root_username.txt", "w");
+    new_password = fopen("password_root.txt", "w");
+    fprintf(new_user, username_new);
+    fprintf(new_password, password_new);
+    fclose(new_user);
+    fclose(new_password);
 }

clr_file.h → clr_file.c

@@ -1,14 +1,14 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-//I have made this function thinking that the clearScreen will work on every system.
-void clearScreen()
-{
-#if defined(__linux__) || defined(__unix__) || defined(__APPLE__)
-    system("clear");
-#endif
-
-#if defined(_WIN32) || defined(_WIN64)
-    system("cls");
-#endif
-}
+#include <stdio.h>
+#include <stdlib.h>
+
+//I have made this function thinking that the clearScreen will work on every system.
+void clearScreen()
+{
+#if defined(__linux__) || defined(__unix__) || defined(__APPLE__)
+    system("clear");
+#endif
+
+#if defined(_WIN32) || defined(_WIN64)
+    system("cls");
+#endif
+}

copy_file.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Fucntion to copy file
+void copy()
+{
+    FILE *ptr1;
+    FILE *ptr2;
+    char filename1[25], filename2[25], content;
+
+    getchar();
+    printf("Enter the filename to be copied- ");
+    fgets(filename1, 25, stdin);
+    filename1[strlen(filename1) - 1] = 0;
+
+    printf("Now enter the name of the file in which the contents of the %s to be copied - ", filename1);
+    fgets(filename2, 25, stdin);
+    filename2[strlen(filename2) - 1] = 0;
+
+    ptr1 = fopen(filename1, "r");
+
+    if (ptr1 == NULL)
+    {
+        printf("Cannot copy\n");
+    }
+    else
+    {
+        ptr2 = fopen(filename2, "w");
+
+        content = fgetc(ptr1);
+
+        while (content != EOF)
+        {
+            fputc(content, ptr2);
+            content = fgetc(ptr1);
+        }
+
+        printf("\nSuccessfully copied to %s \n", filename1);
+        fclose(ptr2);
+    }
+
+    fclose(ptr1);
+}

date_file.h → date_file.c

@@ -1,12 +1,12 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <time.h>
-
-
-//date function. If the user clears the screen it can be usefule to see the date.
-void date()
-{
-    time_t t;
-    time(&t);
-    printf("%s\n\n", ctime(&t));
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+
+//date function. If the user clears the screen it can be usefule to see the date.
+void date()
+{
+    time_t t;
+    time(&t);
+    printf("%s\n\n", ctime(&t));
 }

echo_file.h → echo_file.c

@@ -4,8 +4,8 @@
 //Function to print the anything which user has given.
 void echo()
 {   
-    getchar();
+    fgetc(stdin);
     char user_str[1000000];
-    gets(user_str); 
-    puts(user_str);
+    fgets(user_str, 1000000, stdin);
+    printf("%s", user_str);
 }