_printf

_printf is a custom implementation of the C programming function printf.

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

Some Examples

Integer

• Input: _printf("There are %i dozens in a gross\n", 12);

• Output: There are 12 dozens in a gross

Character

• Input: _printf("The first letter in the alphabet is %c\n", 'A');

• Output: The first letter in the alphabet is A

String

• Input: _printf("%s\n", 'This is a string.');

• Output: This is a string.

Decimal:

• Input: _printf("%d\n", 1000);

• Output: 1000

Rot13

• Input: _printf("Unknown:[%R]\n", "HELLO WORLD");

• Output: URYYB JBEYQ

FLAGS

• Input: printf("Flag: [%+ d]", 1230);

• Output: Flag: [+1230] => 13

OCTAL

• Input: printf("Unsigned octal:[%o]", 6);

• Output: Unsigned octal:[6] => 18

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 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.

functions.c functions1.c functions2.c

• contains all function of each specifier used for _printf.

• all function have its own description inside the file.

handle_print.c

• contains arguments types used for _printf.

get_flags.c

• contains all function for each flag use for _printf.

utils.c

• contains some necessary functionalities for _printf.

ger_width.c

• contains functions to get width for spcifics spcifiers.

writee_handlers.c

• contains write functions.

Authors

Belema Acheye Obuborosa | @Gmdbelema

Hammed Alidu | @Harleewon