Book Image

Practical C Programming

By : B. M. Harwani
Book Image

Practical C Programming

By: B. M. Harwani

Overview of this book

Used in everything from microcontrollers to operating systems, C is a popular programming language among developers because of its flexibility and versatility. This book helps you get hands-on with various tasks, covering the fundamental as well as complex C programming concepts that are essential for making real-life applications. You’ll start with recipes for arrays, strings, user-defined functions, and pre-processing directives. Once you’re familiar with the basic features, you’ll gradually move on to learning pointers, file handling, concurrency, networking, and inter-process communication (IPC). The book then illustrates how to carry out searching and arrange data using different sorting techniques, before demonstrating the implementation of data structures such as stacks and queues. Later, you’ll learn interesting programming features such as using graphics for drawing and animation, and the application of general-purpose utilities. Finally, the book will take you through advanced concepts such as low-level programming, embedded software, IoT, and security in coding, as well as techniques for improving code performance. By the end of this book, you'll have a clear understanding of C programming, and have the skills you need to develop robust apps.
Table of Contents (20 chapters)

Understanding how a vulnerability occurs while copying strings

In this recipe, we will see the vulnerability that might occur while copying a string. We will also see how to avoid that vulnerability. We will first define a structure consisting of two members. In one of the members, we will be copying a text that is larger than its capacity, which will result in overwriting the content of another member.

In the next recipe, we will learn how to avoid this problem.

How to do it...

Here are the steps to understand how a vulnerability occurs while copying a string:

  1. Define a structure consisting of two members, name and orderid.
  2. Define a variable of the structure type defined in step 1.
  3. Assign any integer value to the orderid...