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)

Learning how to write secure code while copying strings

To avoid the buffer overflow that occurs when using the strcpy function, simply replace the strcpy function with the strncpy function. strncpy will copy only the specified number of bytes into the destination string, hence buffer overflows don't occur in this function. Let's see how it is done.

How to do it...

Here are the steps to make secure code 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 member of the structure.
  4. Determine the length of the name member of the structure to find the maximum number of characters...