_PRINTF PROJECT
- Project description
The _printf project is a custom implementation of the standard C library function printf. This project reproduces the behavior of printf for several format specifiers and handles basic formatted output to the standard output stream.
Supported format specifiers
| Specifier | Description |
|---|---|
| %c | Prints a single character |
| %s | Prints a string of characters |
| %d, %i | Prints a signed decimal integer |
| %% | Prints a literal % character |
The goal of this project is to understand variadic functions, parsing of format strings, handling of conversion specifiers, and manual output formatting without using the real printf.
- Compilation command
To compile the project, use:
gcc -Wall -Wextra -Werror -pedantic *.c -o _printf
This creates an executable named _printf.
- Requirements
The project must be built and tested in the following environment:
* Ubuntu 20.04 LTS
* GCC (GNU Compiler Collection)
* Git for version control
* Standard C libraries (stdlib.h, stdarg.h, unistd.h)
- Usage Examples
The following examples illustrate the program’s usage.
Now the outputs:
- Manual Page
To display the Man page, use the command:
man ./man_3_printf
or man 3 _printf
Summary of sections:
* NAME — brief description
* SYNOPSIS — basic usage
* DESCRIPTION — main features
* RETURN VALUE — descriptions of returned values
* EXAMPLES — usage examples
* COMPLEMENTARIES INFORMATIONS — date, authors etc
For more details, please refer to the full man page below.
- Testing
A main.c file was used for testing. Compile and run:
gcc -Wall -Wextra -Werror -pedantic -std=gnu89 -Wno-format *.c
To ensure memory safety, use the command:
valgrind ./_printf.c
This will detects memory leaks, invalid memory accesses, and use of uninitialized memory.
- Flowchart
The flowchart below illustrates the main steps and logic of the project.
- Additional Notes
The project emphasizes modularity: each specifier is handled by a dedicated function. Care must be taken with pointer handling. Variadic functions (va_list, va_start, va_arg, va_end) are crucial to the implementation.
The authors of this project are Morgane Abbattista (Alreix) and Nicolas Da Silva (NicolasDS83600). The project was initialized on 11/24/2025 and completed on 11/27/2025.