_printf

This projects aims to clone the famous printf() function from the C standard library, with as much features as possible.

_printf() prints output according to a format as described below, and writes that output to stdout. The return value when successful is the length of the printed string.

The format string is a character string, composed of zero or more directives: ordinary characters (not %) qhich are copied unchanged to the output stream; and conversion specifiers, each of which results in fetching zero or more subsequent arguments. Each conversion specifier is introduced by the character %, and ends with a conversion specifier. In between there may be (in this order) zero or more flags, an optional minimum field width, an optional precision and an optional length modifier.

Prototype

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

Examples

_printf("This is a string"); // prints "This is a string"

char ch = 'a';
_printf("This is a char: %c", ch); // prints "This is a char: a"

char *str = "This is a string";
_printf("%s", str); // prints "This is a string"

int len;
len = _printf("toto"); // len is equal to strlen("toto") : 4

Task list

Below is a list of the required tasks and their corresponding features.

• Task 0 - Write a function that produces output according to a format, and handles the following conversion specifiers: c, s and %
• Task 1 - Handle the following conversion specifiers: d, i
• Task 2 - Create a man page for your function
• Task 3 - Handle the following custom conversion specifiers: b
• Task 4 - Handle the following conversion specifiers: u, o, x, X
• Task 5 - Use a local buffer of 1024 chars in order to call write as little as possible.
• Task 6 - Handle the following custom conversion specifiers: S
• Task 7 - Handle the following conversion specifiers: p
• Task 8 - Handle the following flags for non-custom conversion specifiers: +, space, #
• Task 9 - Handle the following length modifiers for non-custom conversion specifiers: l, h
• Task 10 - Handle the field width for non-custon conversion specifiers
• Task 11 - Handle the precision for non-custom conversion specifiers
• Task 12 - Handle the 0 flag for non-custom conversion specifiers
• Task 13 - Handle the - flag for non-custom conversion specifiers
• Task 14 - Handle the following custom conversion specifier: r
• Task 15 - Handle the following custom conversion specifier: R
• Task 16 - All the above options work well together

Authors

Pierre Forcioli & Thibaud Poncin