Luna/libc/src/stdio.cpp

#define _LUNA_SYSTEM_ERROR_EXTENSIONS
#include <bits/errno-return.h>
#include <luna/Format.h>
#include <stdio.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

FILE* stderr = nullptr;

extern "C"
{
    int console_write(const char* str, size_t size)
    {
        long rc = syscall(SYS_console_write, str, size);
        __errno_return(rc, int);
    }

    int vsnprintf(char* buf, size_t max, const char* format, va_list ap)
    {
        return (int)vstring_format(buf, max, format, ap);
    }

    int snprintf(char* buf, size_t max, const char* format, ...)
    {
        va_list ap;
        va_start(ap, format);

        int rc = vsnprintf(buf, max, format, ap);

        va_end(ap);

        return rc;
    }

    int vsprintf(char* buf, const char* format, va_list ap)
    {
        return vsnprintf(buf, (size_t)-1, format, ap);
    }

    int sprintf(char* buf, const char* format, ...)
    {
        va_list ap;
        va_start(ap, format);

        int rc = vsnprintf(buf, (size_t)-1, format, ap);

        va_end(ap);

        return rc;
    }

    int printf(const char* format, ...)
    {
        va_list ap;
        va_start(ap, format);

        int rc = (int)pure_cstyle_format(
            format, [](char c, void*) { console_write(&c, 1); }, nullptr, ap);

        va_end(ap);

        return rc;
    }

    int puts(const char* s)
    {
        if (console_write(s, strlen(s)) < 0) return -1;
        if (console_write("\n", 1) < 0) return -1;

        return 0;
    }
}