/printf

This team project is part of the first year curriculum of ALX. _printf replicates the C standard library printf() function. What you should learn from this project: How to use git in a team setting Applying variadic functions to a big project and lots more.

Primary LanguageC

Secrets_of_printf.pdf

printf Project

Description

This team project is part of the first year curriculum of ALX. _printf replicates the C standard library printf() function.

What you should learn from this project:

  • How to use git in a team setting
  • Applying variadic functions to a big project
  • The complexities of printf
  • Managing a lot of files and finding a good workflow

Prototype

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

Usage

  • Prints a string to the standard output, according to a given format
  • All files were created and compiled on Ubuntu 14.04.4 LTS using GCC 4.8.4 with the command gcc -Wall -Werror -Wextra -pedantic *.c
  • Returns the number of characters in the output string on success, -1 otherwise
  • Call it this way: _printf("format string", arguments...) where format string can contain conversion specifiers and flags, along with regular characters

Examples

  • _printf("Hello, main\n") prints "Hello, Main", followed by a new line
  • _printf("%s", "Hello") prints "Hello"
  • _printf("This is a number: %d", 98) prints "This is a number: 98"

Tasks

These are all the tasks of this project, the ones that are completed link to the corresponding files.

  • Write a function that produces output according to format.
    • c : converts input into a character
    • s : converts input into a string
  • Handle the following conversion specifiers:
    • d : converts input into a base 10 integer
    • i : converts input into an integer
  • Create a man page for your function
  • Handle the following conversion specifiers:
    • b : the unsigned int argument is converted to binary
  • Handle the following conversion specifiers:
    • u : converts the input into an unsigned integer
    • o : converts the input into an octal number
    • x : converts the input into a hexadecimal number
    • X : converts the input into a hexadecimal number with capital letters
  • Use a local buffer of 1024 chars in order to call write as little as possible.
  • Handle the following custom conversion specifier:
    • S : prints the string
    • Non printable characters (0 < ASCII value < 32 or >= 127) are printed this way: \x, followed by the ASCII code value in hexadecimal (upper case - always 2 characters)
  • Handle the following conversion specifier:
    • p : int input is converted to a pointer address
  • Handle the following flag characters for non-custom conversion specifiers:
    • + : adds a + in front of signed positive numbers and a - in front of signed negative numbers
    • space : same as +, but adds a space (is overwritten by +)
    • # : adds a 0 in front of octal conversions that don't begin with one, and a 0x or 0X for x or X conversions

[9. Sarcasm is lost in print]

  • Handle the following length modifiers for non-custom conversion specifiers:
    • l : converts d, i, u, o, x, X conversions in short signed or unsigned ints
    • h : converts d, i, u, o, x, X conversions in long signed or unsigned ints

[10. Print some money and give it to us for the rain forests]

  • Handle the field width for non-custom conversion specifiers.

[11. The negative is the equivalent of the composer's score, and the print the performance]

  • Handle the precision for non-custom conversion specifiers.

[12. It's depressing when you're still around and your albums are out of print]

  • Handle the 0 flag character for non-custom conversion specifiers.

[13. Every time that I wanted to give up, if I saw an interesting textile, print what ever, suddenly I would see a collection]

  • Handle the - flag character for non-custom conversion specifiers.
  • Handle the following custom conversion specifier:
    • r : prints the reversed string
  • Handle the following custom conversion specifier:
    • R : prints the rot13'ed string

[16. * ]

  • All the above options work well together.

Authors