From f79603c7780af124790802ca0cc375d862220aaf Mon Sep 17 00:00:00 2001
From: Tom-on64 <kubecekt@gmail.com>
Date: Mon, 26 Aug 2024 21:15:35 +0200
Subject: [PATCH] Added stdarg.h

---
 include/c/_printf.h |  14 ++++++++------
 include/c/stdarg.h  |  10 ++++++++++
 kern.iso            | Bin 1470464 -> 1470464 bytes
 3 files changed, 18 insertions(+), 6 deletions(-)
 create mode 100644 include/c/stdarg.h

diff --git a/include/c/_printf.h b/include/c/_printf.h
index e2d838b..0c0a85c 100644
--- a/include/c/_printf.h
+++ b/include/c/_printf.h
@@ -3,10 +3,12 @@
 
 #include <string.h>
 #include <stdlib.h>
+#include <stdarg.h>
 
 // TODO: Support negative numbers
 int printf(const char* fmt, ...) {
-    unsigned int* argPtr = (unsigned int*)&fmt + 1; // First arg after fmt
+    va_list args;
+    va_start(args, fmt);
     
     // Printing buffer
     static char* buffer;
@@ -35,23 +37,22 @@ int printf(const char* fmt, ...) {
         } else if (state == '%') {
             switch (c) {
                 case 'd': // Decimal number
-                    strcat(buffer, itoa(*argPtr++, 10));
+                    strcat(buffer, itoa(va_arg(args, int), 10));
                     len += strlen(&buffer[len]); // Add the remaining length
                     break;
                 case 'x': // Hex number
-                    strcat(buffer, itoa(*argPtr++, 16));
+                    strcat(buffer, itoa(va_arg(args, int), 16));
                     len += strlen(&buffer[len]);
                     break;
                 case 's': // String
-                    char* s = *(char**)argPtr++;
+                    char* s = va_arg(args, char*);
                     
                     while (*s != '\0') {
                         buffer[len++] = *s++;
                     }
                     break;
                 case 'c': // Char
-                    buffer[len++] = *(char*)argPtr;
-                    argPtr++;
+                    buffer[len++] = va_arg(args, char);
                     break;
                 default: // This looks insane
                     buffer[len++] = '%';
@@ -66,6 +67,7 @@ int printf(const char* fmt, ...) {
     buffer[len] = '\0';
     write(1, buffer, len);
     free(buffer);
+    va_end(args);
 
     return 0;
 }
diff --git a/include/c/stdarg.h b/include/c/stdarg.h
new file mode 100644
index 0000000..c5f3ec8
--- /dev/null
+++ b/include/c/stdarg.h
@@ -0,0 +1,10 @@
+#ifndef STDARG_H
+#define STDARG_H
+
+typedef char* va_list;
+#define va_start(ap, paramn) (void)((ap) = (char*)(&(paramn) + 1))
+#define va_end(ap) (void)((ap) = 0)
+#define va_arg(ap, type) (((type*)((ap) = ((ap) + sizeof(type))))[-1])
+
+#endif
+
diff --git a/kern.iso b/kern.iso
index 8017d13fd70914a7c8368dcd28b3bb5d48c15b09..7245df411f2226b9b5bde18a780e0df2a505c6cf 100644
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