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The logger class provides console output with color support and formatted printing capabilities for debugging and diagnostics.

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Overview

This class extends generic_logger to provide:
  • Colored console output with multiple severity levels
  • Printf-style formatted printing with type safety
  • Output control for suppressing logs
  • Cross-platform terminal color support
  • Forced printing that bypasses output controls

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Constructor & Destructor

logger()
~logger() override
On Windows, the constructor saves the current console code page and sets UTF-8 mode. The destructor restores the original code page.

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Methods

Prints a message with the specified color. 
void print(color c, std::string_view message) override
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c
color
The color to use for the output
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message
std::string_view
The message to print
Prints a formatted message with the specified color using printf-style formatting. 
void print(color c, const char* message, ...) override
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c
color
The color to use for the output
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message
const char*
Printf-style format string
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...
variadic
Arguments matching the format string
Note: This method respects the output disabled flag.

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force_print

Prints a formatted message that bypasses the output disabled flag. 
void force_print(color c, const char* message, ...)
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c
color
The color to use for the output
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message
const char*
Printf-style format string
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...
variadic
Arguments matching the format string

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Severity-Specific Methods

Convenience methods for common logging levels.

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info

void info(const char* message, ...) const
Logs informational messages in cyan.

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warn

void warn(const char* message, ...) const
Logs warning messages in yellow.

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error

void error(const char* message, ...) const
Logs error messages in red.

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success

void success(const char* message, ...) const
Logs success messages in green.

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log

void log(const char* message, ...) const
Logs general messages in white.

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Output Control

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disable_output

void disable_output(const bool value)
Enables or disables console output.
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value
bool
true to disable output, false to enable
Note: The force_print method bypasses this setting.

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is_output_disabled

bool is_output_disabled() const
Returns: true if output is currently disabled, false otherwise.

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Color Enum

Available colors for terminal output: 
enum class color
{
    black,
    red,
    green,
    yellow,
    blue,
    cyan,
    pink,
    white,
    gray,
    dark_gray,
}

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Usage Example

#include <windows-emulator/logger.hpp>

logger log;

// Basic colored output
log.print(color::green, "Emulator started\n");

// Formatted output
log.info("Loading module at 0x%llx", base_address);
log.warn("Syscall %d not fully implemented", syscall_number);
log.error("Failed to allocate %zu bytes", size);
log.success("Process initialized with PID %d", pid);

// Conditional logging
if (verbose_mode) {
    log.log("Thread %d entering syscall", thread_id);
}

// Disable output temporarily
log.disable_output(true);
log.info("This won't be printed");
log.force_print(color::red, "But this will be!");
log.disable_output(false);

// Check output state
if (!log.is_output_disabled()) {
    log.print(color::cyan, "Output is enabled\n");
}

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Platform Notes

  • Windows: Automatically manages console code page for UTF-8 support
  • Unix/Linux: Uses ANSI escape codes for color output
  • Format string safety is enforced via compiler attributes on GCC/Clang

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See Also

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