🖨️ ft_printf

A custom partial implementation of the printf function from C standard library

Developed using  

ft_printf

Welcome to ft_printf, a custom PARTIAL implementation of the famous printf function in C. This project is designed to help you learn and understand C programming, variadic functions, and formatting output.

📚 Introduction

ft_printf is a function that formats and prints data to the standard output. It supports various format specifiers, flags, and data types, making it a versatile tool for displaying information in your C programs.

🔧 Function Prototype

int ft_printf(const char *format, ...); (manual)

Variadic Functions

Variadic functions are functions that can take a variable number of arguments. The standard C library function printf is a well-known example of a variadic function.

Variadic functions can be declared with an ellipsis (...) as the last parameter in the parameter list, indicating that the function accepts a variable number of arguments. To handle the arguments passed to a variadic function, the C standard library provides a set of macros in the stdarg.h header.

stdarg.h Macros

The following macros are used to handle variadic function arguments:

1. va_list: A type used to declare a variable that will store the argument list.

2. va_start(ap, param): Initializes the va_list object ap to start reading arguments after the last named parameter param.

3. va_arg(ap, type): Retrieves the next argument from the va_list object ap with the specified type.

4. va_end(ap): Cleans up the va_list object ap after all arguments have been read.

📄 Format Specifiers

Specifier	Description
%c	Character
%s	String
%d or %i	Signed decimal integer
%u	Unsigned decimal integer
%x	Unsigned hexadecimal integer (lowercase letters)
%X	Unsigned hexadecimal integer (uppercase letters)
%p	Pointer address
%%	A literal '%' character

Edge Cases

When implementing ft_printf, it is important to consider the following edge cases:

1. Null pointers passed as string arguments (%s): In this case, the function should print (null).

2. Negative numbers for signed integer formats (%d and %i): The function should correctly handle the sign and the conversion of the number.

3. Large numbers and edge values: The function should be able to handle the largest and smallest representable values for each data type (e.g., INT_MIN, INT_MAX, UINT_MAX, and pointer addresses).

4. Incorrect or unsupported format specifiers: The function should be able to handle unexpected or unsupported format specifiers gracefully.

Usage

To use ft_printf, compile the source files and include the header ft_printf.h in your project. You can then use ft_printf just like you would use the standard printf function.