C - printf

Project Requirements

• All files will be compiled on Ubuntu 14.04 LTS
• Programs and functions will be compiled with gcc 4.8.4 using flags -Wall -Werror -Wextra and -pedantic
• Code must follow the Betty style
• Global variables are not allowed
• 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.

File Descriptions

• _printf.c: - contains the _printf function, 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.
• holberton.h: - contains all function prototypes used for _printf.
• man_3_printf: - manual page for the custom _printf function.
• functions_print.c: - contains the functions print_char, print_string, print_porc, and print_rev which handle the conversion specifiers c, s, %, and r, respectively, as well as print_bin, which prints binary numbers.
• aux_print_int.c: - contains the functions print_digit and aux, which handle the conversion specifiers i and d, respectively and an auxiliar function to print positive and negative numbers.
• advanced_functions.c: - contains the functions print_hex, which prints an unsigned int in hexidecimal form, print_rot, which handles the conversion specifier R and prints the rot13 letters substitution, print_oct, wich prints octal numbers.
• get_function.c: - wich contains the structure array to find the function that the program needs to execute for each format.

Authors ©️

• Alexander Forero - Github
• Carolina Capote - Github
• Daniel Escobar - Github