ft_printf

Overview

ft_printf is a custom implementation of the standard printf function in C. It is part of a project at 42 School designed to enhance your understanding of variadic functions, formatted output, and low-level memory management. This project replicates the behavior of printf, handling multiple format specifiers and ensuring a robust, efficient implementation.

Status

Finished: 19/11/2024. Grade: 100/100.

Features

• Supports the following format specifiers:
  • %c for characters
  • %s for strings
  • %p for pointers
  • %d and %i for signed integers
  • %u for unsigned integers
  • %x and %X for hexadecimal numbers (lowercase and uppercase, respectively)
  • %% for the percentage sign
• Modular code structure with individual handlers for each specifier
• Thorough management of edge cases and memory handling

Functionality

The core function of the project is ft_printf, which processes the input format string and arguments to produce formatted output.

Function Details

ft_printf

int ft_printf(const char *fm, ...);

• Parameters:
  • fm: The format string containing text and specifiers.
  • Variadic arguments corresponding to the specifiers in the format string.
• Return Value: Total number of characters printed.

ft_dispatcher

Handles the logic for selecting the correct handler function based on the format specifier.

int ft_dispatcher(char c, va_list *args);

• Parameters:
  • c: The current format specifier.
  • args: The variadic argument list (address passed to allow modification and iteration through arguments within the called functions).
• Return Value: Length of the printed output for the given specifier.

File Structure

• ft_printf.c: Contains the ft_printf function and the main loop to process the format string.
• ft_dispatcher.c: Implements logic for handling format specifiers.
• Handlers (e.g., ft_handler_c, ft_handler_s): Modular functions for each specifier.
• Utilities: Helper functions for string manipulation, memory allocation, etc.

Testing

To compile and test the project, a main.c file is provided for convenience. Run the following command:

make exe

This will create an executable that uses ft_printf with example use cases from main.c.

License

This project is developed as part of 42 School and follows its guidelines. Redistribution and use are allowed under the same terms.

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Author: macuesta
Last Updated: 30/11/2024