42cursus' ft_printf

Development repo for 42cursus' ft_printf project
For further information about 42cursus and its projects, please refer to 42cursus repo.

About · Usage · Useful Links

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🗣️ About

This project is pretty straight forward. You will recode printf. Hopefully you will be able to reuse it in future project without the fear of being flagged as a cheater. You will mainly learn how to use variadic arguments.

🚀 TLDR: this project consists of coding a library that contains a simplified version (more
information below) of the printf function.

Mandatory

• format specifiers - cspdiuxX%

🛠️ Usage

Requirements

The library is written in C language and thus needs the gcc compiler and some standard C libraries to run.

Instructions

1. Compiling the library

To compile the library, run:

$ cd path/to/ft_printf && make

2. Using it in your code

To use the library functions in your code, simply include its header:

#include "ft_printf.h"

and, when compiling your code, add the required flags:

-lftprintf -L path/to/libftprintf.a -I path/to/ft_printf.h

Third-party testers

• printfTester
• gavinfielder/pft
• Mazoise/42TESTERS-PRINTF
• HappyTramp/ft_printf_test
• t0mm4rx/ftprintfdestructor
• charMstr/printf_lover_v2

📌 Useful Links

• C++ Reference - printf
• Article: Secrets of “printf” (PDF)
• MacOS documentation - printf
• IEEE-754 Floating Point Converter
• How does one print floats for ft_printf? - Stack Overflow - 42 Network
• Printing Floating-Point Numbers
• Printing Floating-Point Numbers Quickly and Accurately with Integers
• What precisely does the %g printf specifier mean? - Stack Overflow

Notes

1. What is Variadic Functions?
   • Variadic function takes indefinite size arity and a variable number of arguments as a parameter. Situations that you do not know how many parameters pass the function.
2. what is ellipses (...)?
   • The ellipsis (...) is part of the C language and indicates that there are 0 or more optional arguments.

3. What is va_list?

4. What is va_start?
   • gets the address of the first argument.
5. What is va_arg?
   • dereference the block address and type cast it to the appropriate type. then goes to the next block of memory.
   • What is a "Type Descriptor"?

6. What is va_end?

7. Calling convensions!
   • https://www.youtube.com/watch?v=JHGTXM3oIs0
   • https://en.wikipedia.org/wiki/X86_calling_conventions
   • https://www.youtube.com/watch?v=F3XiH78erNM&t=1615s

notes

• man stdarg