_printf

Prototype:

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

_printf is a customized C function based on the original function printf. This is our first big proyect as Holberton School students C#17.

Examples

Input	Output
_printf("%s\n", 'Hello!');	Hello!
_printf("The last letter of Holberton is %c\n", 'n');	The last letter of Holberton is n
_printf("%d\n");	7000
_printf("My hand has %i fingers\n", 5);	My hand has 5 fingers
_printf("Address: %p\n", addr);	Address: 0x7ffe637541f0

General Requirements

• Allowed editors: vi, vim, emacs
• All your files will be compiled on Ubuntu 20.04 LTS using gcc, using the options -Wall -Werror -Wextra -pedantic -std=gnu89
• Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl
• You are not allowed to use global variables
• No more than 5 functions per file

Authorized functions and macros

write (man 2 write) malloc (man 3 malloc) free (man 3 free) va_start (man 3 va_start) va_end (man 3 va_end) va_copy (man 3 va_copy) va_arg (man 3 va_arg)

Mandatory Tasks

• Write function that produces output with conversion specifiers c, s, and %.
• Handle conversion specifiers d, i.
• Create a man page for your function.

Advanced Tasks

• Handle conversion specifier b.
• Handle conversion specifiers u, o, x, X.
• Use a local buffer of 1024 chars in order to call write as little as possible.
• Handle conversion specifier S.
• Handle conversion specifier p.
• Handle flag characters +, space, and # for non-custom conversion specifiers.
• Handle length modifiers l and h for non-custom conversion specifiers.
• Handle the field width for non-custom conversion specifiers.
• Handle the precision for non-custom conversion specifiers.
• Handle the 0 flag character for non-custom conversion specifiers.
• Handle the custom conversion specifier r that prints the reversed string.
• Handle the custom conversion specifier R that prints the rot13'ed string.
• All above options should work well together.

Files

File	Description
_printf.c	Contains the fucntion _printf, which uses the prototype int _printf(const char *format, ...);. The format string is composed of zero or more directives. See man 3 printf for more detail. _printf will return the number of characters printed (excluding the null byte used to end output to strings) and will write output to stdout, the standard output stream.
_putchar.c	Contains the function _putchar, which writes a character to stdout.
main.h	Contains all function prototypes used for _printf.
man_3_printf	Manual page for the custom _printf function.
print_chars.c	Contains the functions print_c, print_s, print_S, and print_r which handle the conversion specifiers c, s, S, and r, respectively, as well as hex_print, which prints a char's ascii value in uppercase hex.
_print_numbers.c	Contains the functions print_i and print_d, which handle the conversion specifiers i and d, respectively.
_print_hex.c	Contains the functions print_hex, which prints an unsigned int in hexidecimal form, print_x, print_X, and _print_p, which handle the conversion specifiers x, X, and p, respectively.
print_unsigned_int.c	Contains the functions print_u, print_o, and print_b, which handle the conversion specifiers u, o, and b, respectively.
_print_rot13.c	Contains the function print_R, which handles the conversion specifier R.

By:

Franco Trenche

Juan Manuel Reyes