For this project, students are expected to look at these concepts:
Group Projects
Pair Programming - How To
Flowcharts
Technical Writing
Write your own printf function.
Secrets of printf
Group Projects concept page (Don’t forget to read this)
Flowcharts concept page
printf (3)
Allowed editors: vi, vim, emacs
All your files will be compiled on Ubuntu 20.04 LTS using gcc, using the options -Wall -Werror -Wextra -pedantic -std=gnu89
All your files should end with a new line
A README.md file, at the root of the folder of the project is mandatory
Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl
You are not allowed to use global variables
No more than 5 functions per file
In the following examples, the main.c files are shown as examples. You can use them to test your functions, but you don’t have to push them to your repo (if you do we won’t take them into account). We will use our own main.c files at compilation. Our main.c files might be different from the one shown in the examples
The prototypes of all your functions should be included in your header file called main.h
Don’t forget to push your header file
All your header files should be include guarded
Note that we will not provide the _putchar function for this project
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)
Your code will be compiled this way:
$ gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c
As a consequence, be careful not to push any c file containing a main function in the root directory of your project (you could have a test folder containing all your tests files including main functions)
Our main files will include your main header file (main.h): #include main.h
You might want to look at the gcc flag -Wno-format when testing with your _printf and the standard printf. Example of test file that you could use:
alex@ubuntu:~/c/printf$ cat main.c #include <limits.h> #include <stdio.h> #include "main.h"
/**
-
main - Entry point
-
Return: Always 0 */ int main(void) { int len; int len2; unsigned int ui; void *addr;
len = _printf("Let's try to printf a simple sentence.\n"); len2 = printf("Let's try to printf a simple sentence.\n"); ui = (unsigned int)INT_MAX + 1024; addr = (void *)0x7ffe637541f0; _printf("Length:[%d, %i]\n", len, len); printf("Length:[%d, %i]\n", len2, len2); _printf("Negative:[%d]\n", -762534); printf("Negative:[%d]\n", -762534); _printf("Unsigned:[%u]\n", ui); printf("Unsigned:[%u]\n", ui); _printf("Unsigned octal:[%o]\n", ui); printf("Unsigned octal:[%o]\n", ui); _printf("Unsigned hexadecimal:[%x, %X]\n", ui, ui); printf("Unsigned hexadecimal:[%x, %X]\n", ui, ui); _printf("Character:[%c]\n", 'H'); printf("Character:[%c]\n", 'H'); _printf("String:[%s]\n", "I am a string !"); printf("String:[%s]\n", "I am a string !"); _printf("Address:[%p]\n", addr); printf("Address:[%p]\n", addr); len = _printf("Percent:[%%]\n"); len2 = printf("Percent:[%%]\n"); _printf("Len:[%d]\n", len); printf("Len:[%d]\n", len2); _printf("Unknown:[%r]\n"); printf("Unknown:[%r]\n"); return (0); } alex@ubuntu:
/c/printf$ gcc -Wall -Wextra -Werror -pedantic -std=gnu89 -Wno-format *.c alex@ubuntu:/c/printf$ ./printf Let's try to printf a simple sentence. Let's try to printf a simple sentence. Length:[39, 39] Length:[39, 39] Negative:[-762534] Negative:[-762534] Unsigned:[2147484671] Unsigned:[2147484671] Unsigned octal:[20000001777] Unsigned octal:[20000001777] Unsigned hexadecimal:[800003ff, 800003FF] Unsigned hexadecimal:[800003ff, 800003FF] Character:[H] Character:[H] String:[I am a string !] String:[I am a string !] Address:[0x7ffe637541f0] Address:[0x7ffe637541f0] Percent:[%] Percent:[%] Len:[12] Len:[12] Unknown:[%r] Unknown:[%r] alex@ubuntu:~/c/printf$We strongly encourage you to work all together on a set of tests If the task does not specify what to do with an edge case, do the same as printf