C - printf

The aim is to create our own printf from our understanding to the secrets of printf function.

Also to practice all what we learned from 0x00. C - Hello, World to 0x10. C - Variadic functions.

References

Title: Secrets of “printf”.

Author: Professor Don Colton.

Organization: Brigham Young University Hawaii.

Citation: Colton, D. (2015). Secrets of “printf”.

Link: Secrets_0f_Printf.

Technologies

Tested on Ubuntu 20.04 LTS.

C files are complied using gcc 9.4.0.

C files are written according to the GNU C89 dialect, which includes some extensions beyond the standard C89.

Files

All of the following files are programs written in C:

Filename	Description
_printf.c	produces output according to a format.
printf_char.c	prints a character and returns its length.
printf_string.c	prints a string and returns its length.
printf_37.c	prints the character % and returns its length.
_strlen.c	calcules the length of a string.
_putchar.c	writes a character to stdout.
main.h	header file includes libraries, structures, and the prototypes of all functions used for this project.
printf_dec_int.c	prints an integer or decimal number and returns its length.
printf_bin.c	prints a binary representation for an unsigned integer and returns its length.
printf_unsigned.c	prints the returned unsigned data type.
printf_oct.c	a function that prints or returns octal number.
printf_hex.c	recalls hexadecimal numbers.
printf_HEX.c	recalls hexadecimal numbers (Uppercase).
printf_exclusive_string.c	String with hex-ascii value replaces special chars.
printf_pointer.c	prints the pointer address.

Specifiers

Specifier	Description
c	character.
s	string of characters.
%	character %.
d	decimal number.
i	integer.
b	binary.
u	unsigned.
o	octal.
x	hexadecimal.
X	hexadecimal(uppercase).
S	special chars
p	pointer address

Authors

19818794

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