_printf

This is our own attempt to replicate the function printf.

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

Description

Prints arguments to standard output according to a format string. The format string contains zero or more directives, and the directives specify how the arguments are converted. Returns a count of the number of characters printed excluding the null byte, writing the count to stdout.

Synopsis

#include "main.h"

_printf("Format string %<conversion specifier>", argument);

Conversion Specifiers

• c - For characters
• s - For strings
• i - For integers
• d - For decimal integers
• % - No argument is converted. The complete specification is '%%'

Examples

Character:

• Input: _printf("The authors' initials are %c%c & %c%c\n", 'L', 'H', 'H', 'R');
• Output: The authors' initials are LH & HR

String:

• Input: _printf("Insert string here: %s\n", "Hello, world!");
• Output: Insert string here: Hello, world!

Integer:

• Input: _printf("I would like to buy %i apples, please\n", 8);
• Output: I would like to buy 8 apples, please

Decimal:

• Input: _printf("%d\n", 94007);
• Output: 94007

File Descriptions

• _printf.c: - contains the fucntion _printf.
• _putchar.c: - contains the function _putchar. This function which writes a character to stdout.
• main.h: - contains the prototypes of functions used by _printf.
• man_3_printf: - the manual page for our _printf function.
• conv_d.c: - contains a function to convert a numeric argument to an int. Calls the print_d function with the int as input, and returns the count from from the function.
• print_char.c: - contains a function to handle the 'c' conversion specifier, and print chars.
• print_str.c: - contains a function to handle the 's' conversion specifier, and print strings.
• print_digit.c: - contains a function to handle the 'd' and 'i' conversion specifiers, and print integers.

Authors

Luke Hackett

Hamish Ross