_printf

The project, _printf is the first major project that is built in the holberton school, is about building a function as similar as possible to the original function present in the standard library of programming language C, this is a challenge of some difficulty since the original function behaves in very specific ways in certain cases.

This project was built by Alejandro López and Juan Marcos Cabezas

Table of Contents

1. Authors
2. Features
3. How Use
4. Tasks
5. General Test Cases

Authors

👤 Alejandro López

• Twitter: @alejolo311
• Github: @alejolo311

👤 Juan Marcos Cabezas

• Twitter: @juanmarcab
• Github: @juanmarcoscabezas

Features

• The main function uses structures to call the function corresponding to the case, this allows greater code scalability.
• As in the original printf, the function has a buffer that stores and prints the output strings every 1024 bytes.
• Just like the original printf, the returns of our function are the number of characters printed, when the input is incorrect the return is error -1

How Use

How to compile

Requirements

• compile on Ubuntu 14.04 LTS
• compile with gcc 4.8.4

Flags to compile

$ gcc -Wall -Werror -Wextra -pedantic *.c

Main Example

#include <limits.h>
#include <stdio.h>
#include "holberton.h"

/**
 * main - Entry point
 *
 * Return: Always 0
 */
int main(void)
{
    int len;
    int len2;
    unsigned int ui;
    void *addr;

    len = _printf("Let's try to printf a simple sentence.\n");
    len2 = printf("Let's try to printf a simple sentence.\n");
    ui = (unsigned int)INT_MAX + 1024;
    addr = (void *)0x7ffe637541f0;
    _printf("Length:[%d, %i]\n", len, len);
    printf("Length:[%d, %i]\n", len2, len2);
    _printf("Negative:[%d]\n", -762534);
    printf("Negative:[%d]\n", -762534);
    _printf("Unsigned:[%u]\n", ui);
    printf("Unsigned:[%u]\n", ui);
    _printf("Unsigned octal:[%o]\n", ui);
    printf("Unsigned octal:[%o]\n", ui);
    _printf("Unsigned hexadecimal:[%x, %X]\n", ui, ui);
    printf("Unsigned hexadecimal:[%x, %X]\n", ui, ui);
    _printf("Character:[%c]\n", 'H');
    printf("Character:[%c]\n", 'H');
    _printf("String:[%s]\n", "I am a string !");
    printf("String:[%s]\n", "I am a string !");
    _printf("Address:[%p]\n", addr);
    printf("Address:[%p]\n", addr);
    len = _printf("Percent:[%%]\n");
    len2 = printf("Percent:[%%]\n");
    _printf("Len:[%d]\n", len);
    printf("Len:[%d]\n", len2);
    _printf("Unknown:[%r]\n");
    printf("Unknown:[%r]\n");
    return (0);
}

Tasks

Task 0

Specifier	Function name
%c	print_char()
%s	print_string()
%%	print_percen()

%c

• %c is about being able to print the individual characters that were passed as a parameter to the function.

Test Cases

• _printf("%c", NULL);
• _printf("%c", 'A');
• _printf("%c", 'A');

%s

• %s is about being able to print strings, which are received as parameters to eh function.

Test Cases

• _printf("%s", "holberton");
• _printf("%ss", "holberton");
• _printf("%s", "");
• _printf("%s");

%%

• %% is about being able to print the the char % because being the indefinifier of printf specifiers could generate conflicts at the time of printing.

Test Cases

• _printf("%%");

Files

Task 1

Specifier	Function name
%d	print_d()
%i	print_i()

%d

• %d is about being able to print the integers that can be handled in the int variable, the smallest number is -2147483648 and the max is 2147483647

Test Cases

• _printf("%d",-2147483648);
• _printf("%d", 2147483647);

%i

• %i is about being able to print the integers that can be handled in the int variable, the smallest number is -2147483648 and the max is 2147483647

Test Cases

• _printf("%i",-2147483648);
• _printf("%i", 2147483647);

Files

Task 2

• The Manual.

Files

Task Checklist

• Task 1
• Task 2
• Task 3
• Task 4
• Task 5
• Task 6
• Task 7
• Task 8
• Task 9
• Task 10
• Task 11
• Task 12
• Task 13
• Task 14
• Task 15
• task 16

General Test Cases

• printf(NULL);
• printf("%");