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Custom printf Project


holbie

Made as a project for Holberton School

Authors

Please contact Susan or Chris for any questions, suggestions, or opportunities you would like to discuss!

Table of Contents

Introduction

A custom made printf function built in C using only the write, malloc, free, va_start, va_copy, va__arg, and va_end non custom functions.

Description

The custom printf function is called using _printf() and will take in a format string, followed by an optional comma and argument list.

int _printf(const char *format, ...);

This is the prototype for our custom printf and will return the number of chararacters printed or in the case of a percentage sign at the end of a string, -1. A percentage sign and a specific conversion specifier in our format string will indicate a special print within the format string when matched with a corresponding provided argument.

Features

  • %c : with a char argument, prints that char

  • %s : with a string argument, prints that string

  • %d : with an integer argument, prints that integer

  • %i : with an integer argument, prints that integer

  • %% : will print out just one of the percentage signs

  • %r : with a string argument, prints the reversed string

  • %R : with a string argument, prints the rot13 encoded version of string

  • %p : with a pointer address argument, prints the address in hexadecimal with preceding 0x

  • %S : with a string argument, prints any unprintable characters as \x and the 2 digit hexadecimal representation of the character

  • %u : with an integer argument, prints the unsigned integer

  • %o : with an integer argument, prints the octal notation

  • %x : with an integer argument, prints the hexadecimal notation with lowercase letters

  • %X : with an integer argument, prints the hexadecimal notation with uppercase letters

  • %b : with an integer argument, prints the binary conversion of that integer

Files

File Description
extra_types.c contains function for printing an address
holberton.h header file with all prototypes, libraries, and struct that used to identify correct function
man_3_printf man page for custom printf function
print_basic_types.c functions for printing chars, integers, and strings using %c, %s, %d, %i
printf.c file with main function for calling printf and iterating through format string to print correct output
string_utility file with functions used by strings.c to print different types of strings
strings.c contains functions for printing strings in rot13, reverse, or with unprinted characters represented as hexadecimal
unsigned_type.c file with functions for printing unsigned integer recieving conversions (unsigned, octal, hexadecimal upper and lower case)
utility.c file with helper functions for conversion functions

Built With

Acknowledgments

  • Holberton School
  • Wendy Leung, Raven
  • The C Programming Language by Brian Kernighan