Calendar

A console calendar written in C with a TUI menu.
No external dependencies — uses only ANSI escape sequences and raw terminal mode.

Features

• Year selection from 1899 to 2099
• Toggle week start day (Sunday / Monday)
• Output to terminal or to calendar.txt
• Cross-platform: Linux, Windows (MinGW)

Build

# Linux
make
./build/linux/calendar

# Windows (cross-compile from Linux)
make build_win64   # 64-bit
make build_win32   # 32-bit

# Windows (native MinGW)
mingw32-make build_win64

Binaries are placed in build/<platform>/.

Usage

↑/↓         navigate menu
←/→         change value (year, week start, output)
Enter       select / confirm
Esc         exit

Project structure

File	Description
main.c	Entry point, menu setup, callbacks
menu.c / menu.h	TUI menu (raw terminal + ANSI)
print_calendar.c / print_calendar.h	Calendar generation and printing
Makefile	Build for Linux and Windows

Calendar

• Sakamoto's algorithm for January 1st day-of-week
• Gregorian calendar leap year rules
• Layout: 4 rows × 3 months