kernel: x86_64: rename x86

Rename the x86 arch-specific directory to x86_64, reflecting clang's
architecture selector flags.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/kernel/core/kprintf.c b/kernel/core/kprintf.c
new file mode 100644
index 0000000..c12a01f
--- /dev/null
+++ b/kernel/core/kprintf.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2025 Danny Holman <dholman@gymli.org>
+ *
+ * This file is part of BoxOS, a free and open-source Unix-like operating
+ * system.
+ *
+ * BoxOS is free software; you can redistribute it and/or modify under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * BoxOS is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * BoxOS; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <sys/kprintf.h>
+#include <sys/serial.h>
+#include <string.h>
+
+char* convert(unsigned int num, int base) {
+        static char rep[] = "0123456789ABCDEF";
+        static char buffer[50];
+        char *ptr;
+
+        ptr = &buffer[49];
+        *ptr = '\0';
+
+        do {
+                *--ptr = rep[num%base];
+                num /= base;
+        } while (num != 0);
+
+        return ptr;
+}
+
+int vkprintf(const char *fmt, va_list args) {
+        char *s;
+        int i;
+
+        char buffer[4096];
+        memset(buffer, 0, 4096);
+        for (size_t n = 0; n < strlen(fmt); n++) {
+                if (fmt[n] != '%') {
+                        buffer[strlen(buffer)] = fmt[n];
+                        continue;
+                } else {
+                        n++;
+                }
+
+                switch (fmt[n]) {
+                        case 'c':
+                                i = va_arg(args, int);
+                                buffer[strlen(buffer)] = i;
+                                break;
+                        case 's':
+                                s = va_arg(args, char*);
+                                strcat(buffer, s);
+                                break;
+                        case 'd':
+                                i = va_arg(args, int);
+                                if (i < 0) {
+                                        i = -i;
+                                        strcat(buffer, "-");
+                                }
+                                strcat(buffer, convert(i, 10));
+                                break;
+                        case 'o':
+                                i = va_arg(args, unsigned int);
+                                strcat(buffer, convert(i, 10));
+                                break;
+                        case 'x':
+                                i = va_arg(args, unsigned int);
+                                strcat(buffer, convert(i, 16));
+                                break;
+                }
+        }
+        //tty_write(buffer, strlen(buffer));
+        memset(buffer, 0, 4096);
+        return 0;
+}
+
+int kprintf(const char *fmt, ...) {
+        va_list args;
+        int done;
+
+        va_start(args, fmt);
+        done = vkprintf(fmt, args);
+        va_end(args);
+
+        return done;
+}