42-ft_printf

Overview

ft_printf is a 42 School project that is a custom re-implementation of the standard C printf function. It is designed to format and print data to the standard output using a subset of common conversion specifiers. Packaged as a static library (libftprintf.a), this project leverages functions from your custom libft for various low-level operations. The implementation handles variadic arguments with stdarg.h and splits the work of formatting among several helper functions.

Supported Conversion Specifiers

The implementation supports the following conversion specifiers:

%c: Print a single character.

%d / %i: Print a signed decimal integer.

%u: Print an unsigned decimal integer.

%s: Print a string (null-terminated).

%x: Print an unsigned integer in lowercase hexadecimal format.

%X: Print an unsigned integer in uppercase hexadecimal format.

%p: Print a pointer address.

Note: The implementation focuses on these basic specifiers. It does not handle advanced formatting options such as field width, precision, or additional flags (e.g., 0, -, or #).

Features

• Basic Formatted Output: Supports a selected group of conversion specifiers for simple output formatting.

• Variadic Function Handling: Uses stdarg.h to manage a variable number of arguments.

• Modular Design: Each conversion specifier is managed by a dedicated helper function (e.g., ispercent_c for %c, ispercent_d_i for %d/%i, etc.), with a central search_arg function that parses the format string.

• Integration with libft: Reuses utility functions from your custom libft for consistency and to simplify development.

• Static Library: Compiled into a static library (libftprintf.a), which can be linked into other C projects.

• Makefile Support: Comes with a Makefile that automates the compilation, cleaning, and re-compilation processes.

Testing ft_printf

You can test your implementation with a simple test program. Below is an example:

#include "ft_printf.h"

int main(void)
{
    ft_printf("Hello, %s!\n", "World");
    ft_printf("Character: %c\n", 'A');
    ft_printf("Signed integer: %d, %i\n", -123, -123);
    ft_printf("Unsigned integer: %u\n", 123U);
    ft_printf("Lowercase hex: %x, Uppercase hex: %X\n", 255, 255);
    ft_printf("Pointer address: %p\n", (void *)main);
    return (0);
}

Author

login: jrenault