/printf

Custom implementation of the printf function in C, providing formatted output and variable argument handling

Primary LanguageC

Custom Printf Implementation

This is a custom implementation of the printf function in C. The printf function is widely used for formatted output in C programming, allowing the printing of various data types with specific formatting options. This project aims to replicate some of the basic functionalities of the standard printf function.

Table of Contents

More Info

Authorized functions and macros

  • write (man 2 write)
  • malloc (man 3 malloc)
  • free (man 3 free)
  • va_start (man 3 va_start)
  • va_end (man 3 va_end)
  • va_copy (man 3 va_copy)
  • va_arg (man 3 va_arg)

Introduction

This custom implementation of the printf function provides a simplified version of the functionality found in the standard C library's printf. It is intended to serve as a starting point for understanding the inner workings of the printf function and how it handles conversion specifiers.

Features

  • Supports %c conversion specifier for printing characters.
  • Supports %s conversion specifier for printing strings.
  • Supports %% conversion specifier for printing a percent sign.
  • Supports %d conversion specifier for printing a intergers.
  • Supports %% conversion specifier for printing a intergers.
  • Uses the write function to output characters to the standard output stream.

Usage

To use this custom printf implementation, include the provided header file main.h in your code:

#include "main.h"

Call the _printf function in your code to format and print text:

int len = _printf("Hello, %s!\n", "world");

Supported Conversion Specifiers

  • %c: Print a single character.
  • %s: Print a string.
  • %%: Print a percent sign.
  • %d: Print interger
  • %i: print interger

Limitations

This custom printf implementation has several limitations:

  • Does not support the full range of formatting options available in the standard printf function.
  • Does not handle flag characters, field width, precision, or length modifiers.
  • Does not handle all edge cases and data types as comprehensively as the standard printf function.

Build

Compile the code using a C compiler, for example:

gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o custom_printf

Examples

Check the provided main.c file for usage examples and test cases.

Contributing

Contributions to this project are welcome. If you encounter any issues or have improvements to suggest, feel free to create a pull request or open an issue.

License

This project is licensed under the MIT License.

Contributor

Follow me on Twitter 🐦, connect with me on LinkedIn 🔗, and check out my GitHub 🐙. You won't be disappointed!

👉 Twitter: https://twitter.com/NdiranguMuturi1 👉 LinkedIn: https://www.linkedin.com/in/isaac-muturi-3b6b2b237 👉 GitHub: https://github.com/Isaac-Ndirangu-Muturi-749 👉 Instagram: https://www.instagram.com/isaacndirangumuturi/

So, what are you waiting for? Join me on my tech journey and learn something new today! 🚀🌟