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Printf

Summary

Is an individual project about recoding the famous printf C function into its own library, to learn about variadic functions and improve algorithmic methodology

• %: (% character)
• c: char (character)
• s: char * (string)
• p: void * (pointer's address)
• u: unsigned int (unsigned decimal integer)
• x/X: unsigned int (hexadecimal)
• d/i: int (integer)

int
findtype(va_list ap, char c)
{
	if (c == '%')
		return (write(1, "%", 1));
	else if (c == 'c')
		return (handlechar(ap));
	else if (ft_strchr(c, "diuxX"))
		return (handlenbr(ap, c));
	else if (c == 's')
		return (handlestr(ap));
	else if (c == 'p')
		return (handleptr(ap));
	return (-1);
}

Introduction

You will discover a popular and versatile C function: printf(). This exercise is a great opportunity to improve your programming skills. It is of moderate difficulty. You will discover variadic functions in C. The key to a successful ft_printf is a well-structured and extensible code.

Mandatory part

Write a library that contains ft_printf(), a function that will mimic the original printf()

You have to recode the printf() function from libc. The prototype of ft_printf() is:

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

Here are the requirements:

• Don’t implement the buffer management of the original printf().
• Your function will be compared against the original printf().
• You must use the command ar to create your library. Using the libtool command is forbidden.
• Your libftprintf.a has to be created at the root of your repository.

You have to implement the following conversions:

• %c Prints a single character.
• %s Prints a string (as defined by the common C convention).
• %p The void * pointer argument has to be printed in hexadecimal format.
• %d Prints a decimal (base 10) number.
• %i Prints an integer in base 10.
• %u Prints an unsigned decimal (base 10) number.
• %x Prints a number in hexadecimal (base 16) lowercase format.
• %X Prints a number in hexadecimal (base 16) uppercase format.
• %% Prints a percent sign.

Bonus part

• Manage any combination of the following flags: ’-0.’ and the field minimum width under all conversions.
• Manage all the following flags: ’# +’ (Yes, one of them is a space)