Luna/kernel/src/arch/Serial.cpp

#include "arch/Serial.h"
#include "arch/CPU.h"
#include <Format.h>

namespace Serial
{
    void write(const char* str, usize size)
    {
        while (size--) putchar(*str++);
    }

    void print(const char* str)
    {
        while (*str) putchar(*str++);
    }

    void println(const char* str)
    {
        print(str);
        putchar('\n');
    }

    Result<usize> printf(const char* format, ...)
    {
        va_list ap;
        va_start(ap, format);
        auto rc = cstyle_format(
            format,
            [](char c, void*) -> Result<void> {
                putchar(c);
                return {};
            },
            nullptr, ap);
        va_end(ap);
        return rc;
    }
}

static bool g_check_already_failed = false;

_noreturn bool __check_failed(const char* file, const char* line, const char* func, const char* expr)
{
    if (!g_check_already_failed)
    { // Avoid endlessly failing when trying to report a failed check.
        g_check_already_failed = true;
        Serial::printf("ERROR: Check failed at %s:%s, in %s: %s\n", file, line, func, expr);
    }
    CPU::efficient_halt();
}