Add multi-device emulation support with interactive selection and colored output

.github/workflows/c-cpp.yml

@@ -0,0 +1,23 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install dependencies
+      run: sudo apt-get update && sudo apt-get install -y build-essential
+    - name: Build
+      run: make
+    - name: Run tests
+      run: make check
+    - name: Clean
+      run: make clean

.gitignore

@@ -1 +1,6 @@
 dist/
+virtual_keyboard
+keyboard_writer
+virtusdev
+*.o
+devices/*.o

MIGRATION.md

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+# Migration Guide
+
+## Upgrading from Previous Versions
+
+### Changes in VirtUSDev 2.0
+
+VirtUSDev has been significantly enhanced to support multiple device types. Here's what changed:
+
+#### Renamed Files
+- `keyboard_writer` → `virtusdev` (binary name)
+- `keyboard_writer.c` → `virtusdev.c` (source file, legacy file kept for reference)
+
+**Backward Compatibility:** A symlink `keyboard_writer` → `virtusdev` is created for backward compatibility.
+
+#### New Features
+1. **Multi-device support**: Choose from barcode, USB keyboard, mouse jiggler, or RS232
+2. **Interactive menu**: Run without parameters to select device
+3. **Configuration file**: Set default device in `/etc/virtusdev/config`
+4. **Colored output**: Better readability with ANSI colors
+5. **System installation**: Install to `/usr/local/bin` with `make install`
+6. **Systemd service**: Auto-start on boot
+
+#### Updated Commands
+
+**Old way:**
+```bash
+sudo ./virtual_keyboard              # Only barcode scanner
+sudo ./keyboard_writer /dev/input/event25
+```
+
+**New way (recommended):**
+```bash
+sudo ./virtual_keyboard barcode      # Select device type
+sudo ./virtusdev /dev/input/event25
+```
+
+**New way (backward compatible):**
+```bash
+sudo ./virtual_keyboard              # Still works (shows menu)
+sudo ./keyboard_writer /dev/input/event25  # Symlink still works
+```
+
+#### Device Architecture
+
+Previous version:
+- Single barcode scanner device hardcoded in `virtual_keyboard.c`
+
+Current version:
+- Modular device system in `devices/` directory
+- Each device type in separate file
+- Easy to add new devices
+
+```
+devices/
+├── barcode.c         # Barcode scanner (original functionality)
+├── usb_keyboard.c    # USB keyboard
+├── mouse_jiggle.c    # Mouse jiggler
+├── rs232.c           # RS232 serial port
+└── device_interface.h
+```
+
+#### Configuration File
+
+New in version 2.0, you can set a default device:
+
+Create `/etc/virtusdev/config`:
+```bash
+# VirtUSDev Configuration
+DEVICE=barcode
+```
+
+Priority:
+1. Command-line argument (highest)
+2. Config file
+3. Interactive menu (lowest)
+
+#### Installation
+
+**Old way:**
+```bash
+make
+sudo cp virtual_keyboard /usr/local/bin/
+sudo cp keyboard_writer /usr/local/bin/
+```
+
+**New way:**
+```bash
+make
+sudo make install
+```
+
+This installs:
+- `/usr/local/bin/virtual_keyboard`
+- `/usr/local/bin/virtusdev`
+- `/usr/local/bin/keyboard_writer` (symlink)
+- `/etc/virtusdev/config` (if doesn't exist)
+- `/etc/systemd/system/virtusdev.service`
+
+#### Systemd Service
+
+New feature - auto-start on boot:
+
+```bash
+# Edit config
+sudo nano /etc/virtusdev/config
+
+# Enable service
+sudo systemctl enable virtusdev
+sudo systemctl start virtusdev
+
+# Check status
+sudo systemctl status virtusdev
+```
+
+### Upgrading Scripts
+
+If you have scripts using the old commands, they should continue to work due to backward compatibility.
+
+**Example - No changes needed:**
+```bash
+#!/bin/bash
+# This script still works unchanged
+sudo ./keyboard_writer /dev/input/event25 "BARCODE123"
+```
+
+**Example - Updated to use new features:**
+```bash
+#!/bin/bash
+# Modern version with colors and error handling
+if ! virtusdev /dev/input/event25 "BARCODE123"; then
+    echo "Error: Failed to send barcode"
+    exit 1
+fi
+```
+
+### Breaking Changes
+
+None! All existing functionality is preserved and backward compatible.
+
+### Deprecated Features
+
+- `keyboard_writer.c` source file (replaced by `virtusdev.c`, but kept for reference)
+- Building with old script method (use Makefile instead)
+
+### Recommendations
+
+1. **Use new command names** in new scripts: `virtusdev` instead of `keyboard_writer`
+2. **Use `make install`** for system-wide installation
+3. **Set up systemd service** if you need auto-start
+4. **Use config file** to avoid typing device name repeatedly
+5. **Update documentation** to reference new tool names
+
+### Getting Help
+
+```bash
+# Device emulator help
+./virtual_keyboard --help
+
+# Barcode writer help
+./virtusdev --help
+
+# Check version
+git log --oneline | head -1
+```
+
+### Rollback
+
+If you need to rollback to the previous version:
+
+```bash
+git checkout <previous-commit>
+make clean
+make
+```
+
+The original `keyboard_writer.c` is still in the repository for reference.

Makefile

@@ -1,34 +1,89 @@
 CC = gcc
 CFLAGS = -Wall -Wextra -O2
-TARGETS = virtual_keyboard keyboard_writer
+TARGETS = virtual_keyboard virtusdev
+DEVICE_OBJS = devices/barcode.o devices/usb_keyboard.o devices/mouse_jiggle.o devices/rs232.o
+PREFIX ?= /usr/local
+SYSCONFDIR ?= /etc
 
 all: $(TARGETS)
 
-virtual_keyboard: virtual_keyboard.c device_config.h
-	$(CC) $(CFLAGS) -o virtual_keyboard virtual_keyboard.c
+devices/%.o: devices/%.c devices/%.h devices/device_interface.h device_config.h
+	$(CC) $(CFLAGS) -c -o $@ $<
 
-keyboard_writer: keyboard_writer.c device_config.h
-	$(CC) $(CFLAGS) -o keyboard_writer keyboard_writer.c
+virtual_keyboard: virtual_keyboard.c device_config.h $(DEVICE_OBJS)
+	$(CC) $(CFLAGS) -o virtual_keyboard virtual_keyboard.c $(DEVICE_OBJS)
+
+virtusdev: virtusdev.c device_config.h
+	$(CC) $(CFLAGS) -o virtusdev virtusdev.c
+
+# Legacy keyboard_writer target for compatibility
+keyboard_writer: virtusdev
+	ln -sf virtusdev keyboard_writer
+
+check: $(TARGETS)
+	@echo "Running basic checks..."
+	@echo "[1/4] Checking virtual_keyboard binary..."
+	@test -f virtual_keyboard || (echo "ERROR: virtual_keyboard not built" && exit 1)
+	@echo "[2/4] Checking virtusdev binary..."
+	@test -f virtusdev || (echo "ERROR: virtusdev not built" && exit 1)
+	@echo "[3/4] Checking file permissions..."
+	@test -x virtual_keyboard || (echo "ERROR: virtual_keyboard not executable" && exit 1)
+	@test -x virtusdev || (echo "ERROR: virtusdev not executable" && exit 1)
+	@echo "[4/4] Checking device modules..."
+	@test -f devices/barcode.o || (echo "ERROR: device modules not built" && exit 1)
+	@echo "✅ All checks passed!"
 
 clean:
-	rm -f $(TARGETS)
+	rm -f $(TARGETS) keyboard_writer
+	rm -f devices/*.o
 
 install: all
-	@echo "Run with sudo:"
-	@echo "  sudo ./virtual_keyboard    # Terminal 1"
-	@echo "  sudo ./keyboard_writer     # Terminal 2"
+	@echo "Installing binaries..."
+	install -d $(PREFIX)/bin
+	install -m 755 virtual_keyboard $(PREFIX)/bin/
+	install -m 755 virtusdev $(PREFIX)/bin/
+	ln -sf virtusdev $(PREFIX)/bin/keyboard_writer
+	@echo "Creating config directory..."
+	install -d $(SYSCONFDIR)/virtusdev
+	@if [ ! -f $(SYSCONFDIR)/virtusdev/config ]; then \
+		echo "# VirtUSDev Configuration" > $(SYSCONFDIR)/virtusdev/config; \
+		echo "# Select device: barcode, usb_keyboard, mouse_jiggle, rs232" >> $(SYSCONFDIR)/virtusdev/config; \
+		echo "DEVICE=barcode" >> $(SYSCONFDIR)/virtusdev/config; \
+		echo "Created default config at $(SYSCONFDIR)/virtusdev/config"; \
+	fi
+	@echo "Installing systemd service..."
+	@if [ -d /etc/systemd/system ]; then \
+		install -m 644 virtusdev.service /etc/systemd/system/; \
+		echo "Systemd service installed. Enable with: sudo systemctl enable virtusdev"; \
+	fi
+	@echo ""
+	@echo "Installation complete!"
+	@echo "  Binaries: $(PREFIX)/bin/{virtual_keyboard,virtusdev,keyboard_writer}"
+	@echo "  Config: $(SYSCONFDIR)/virtusdev/config"
+
+uninstall:
+	rm -f $(PREFIX)/bin/virtual_keyboard
+	rm -f $(PREFIX)/bin/virtusdev
+	rm -f $(PREFIX)/bin/keyboard_writer
+	rm -f /etc/systemd/system/virtusdev.service
+	@echo "Uninstalled. Config files preserved in $(SYSCONFDIR)/virtusdev/"
 
 help:
-	@echo "Virtual Barcode Reader - Build Targets:"
+	@echo "VirtUSDev - Virtual Device Emulator - Build Targets:"
 	@echo ""
 	@echo "  make               - Build all binaries"
 	@echo "  make clean         - Remove compiled binaries"
-	@echo "  make install       - Show installation instructions"
+	@echo "  make install       - Install to system (requires root)"
+	@echo "  make uninstall     - Remove from system (requires root)"
 	@echo "  make help          - Show this help message"
 	@echo ""
+	@echo "Usage:"
+	@echo "  sudo ./virtual_keyboard [device_type]    # Start device emulator"
+	@echo "  sudo ./virtusdev [/dev/input/eventX]     # Send barcode data"
+	@echo ""
 	@echo "For more information:"
 	@echo "  README.md          - General usage"
 	@echo "  TESTING.md         - Testing procedures"
 	@echo ""
 
-.PHONY: all clean install help
+.PHONY: all check clean install uninstall help