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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* kprintf.cc — Kernel formatted output
*
* Uses mpaland/printf's vsnprintf_ as the core formatting engine.
* All kernel output ultimately goes through this module.
*
* Architecture:
* vsnprintf_() ← pure formatting, writes to buffer
* ↓
* kprintf() ← format + emit to UART via early_putc
* kvprintf() ← va_list variant
* ksnprintf() ← format into caller's buffer
*/
#include <lume/kprintf.h>
#include <lume/console.h>
#include "printf.h"
/* ------------------------------------------------------------------ */
/* _putchar: required by mpaland/printf for printf_() / vprintf_() */
/* ------------------------------------------------------------------ */
void _putchar(char character)
{
early_putc(character);
}
/* ------------------------------------------------------------------ */
/* Public API */
/* ------------------------------------------------------------------ */
extern "C" int kprintf(const char* fmt, ...)
{
char buf[256];
va_list va;
va_start(va, fmt);
int len = vsnprintf_(buf, sizeof(buf), fmt, va);
va_end(va);
/* Emit to console */
for (int i = 0; i < len && buf[i] != '\0'; ++i) {
early_putc(buf[i]);
}
return len;
}
extern "C" int kvprintf(const char* fmt, va_list va)
{
char buf[256];
int len = vsnprintf_(buf, sizeof(buf), fmt, va);
for (int i = 0; i < len && buf[i] != '\0'; ++i) {
early_putc(buf[i]);
}
return len;
}
extern "C" int ksnprintf(char* buf, int count, const char* fmt, ...)
{
va_list va;
va_start(va, fmt);
int ret = vsnprintf_(buf, (size_t)count, fmt, va);
va_end(va);
return ret;
}
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