src/kernel/lib/stdio/debug.c


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#include <stdarg.h>
#include <stdint.h>
#include <kernel/lib/string.h>
#include <kernel/lib/stdlib.h>
#include <kernel/io/io.h>

void _write_serial(const char *data)
{
    for (size_t i = 0; i < strlen(data); i++) serial_put(data[i]);
}

void serial_printf(const char *fmt, ...)
{
    va_list args;
    va_start(args, fmt);

    uint8_t readyToFormat = 0;

    char buff = 0;

    for (; *fmt; fmt++) {
        if (readyToFormat) {
            if (*fmt == '%') {
                serial_put('%');
                readyToFormat = 0;
                continue;
            }

            buff = *fmt;
            if (buff == 's') {
                const char *str = va_arg(args, const char*);
                _write_serial(str);
                readyToFormat = 0;
            } else if (buff == 'x') {
                char *p = htoa((uint32_t) va_arg(args, int));
                _write_serial(p);
                kfree(p);
                readyToFormat = 0;
            } else if (buff == 'd') {
                char *p = itoa(va_arg(args, int));
                _write_serial(p);
                kfree(p);
                readyToFormat = 0;
            } else if (buff == 'c') {
                serial_put((char) va_arg(args, int));
                readyToFormat = 0;
            }
        } else {
            if (*fmt == '%')
                readyToFormat = 1;
            else
                serial_put(*fmt);
        }
    }

    serial_put('\n');

    va_end(args);
}