From d94b024b73aeca06de417e0fd3c502495312a8b2 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 7 Dec 2019 13:40:28 +0100
Subject: Added userspace libc and began userspace based shell

---
 src/kernel/lib/stdio/vprintf.c | 52 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/kernel/lib/stdio/vprintf.c

(limited to 'src/kernel/lib/stdio/vprintf.c')

diff --git a/src/kernel/lib/stdio/vprintf.c b/src/kernel/lib/stdio/vprintf.c
new file mode 100644
index 0000000..885f584
--- /dev/null
+++ b/src/kernel/lib/stdio/vprintf.c
@@ -0,0 +1,52 @@
+#include <stdarg.h>
+#include <stdint.h>
+#include <kernel/lib/stdio.h>
+#include <kernel/lib/string.h>
+#include <kernel/lib/stdlib.h>
+
+void __writes(const char *data)
+{
+    for (size_t i = 0; i < strlen(data); i++) writec(data[i]);
+}
+
+void vprintf(const char *fmt, va_list args)
+{
+    uint8_t readyToFormat = 0;
+
+    char buff = 0;
+
+    for (; *fmt; fmt++) {
+        if (readyToFormat) {
+            if (*fmt == '%') {
+                writec('%');
+                readyToFormat = 0;
+                continue;
+            }
+
+            buff = *fmt;
+            if (buff == 's') {
+                const char *str = va_arg(args, const char*);
+                __writes(str);
+                readyToFormat = 0;
+            } else if (buff == 'x') {
+                char *p = htoa((uint32_t) va_arg(args, int));
+                __writes(p);
+                kfree(p);
+                readyToFormat = 0;
+            } else if (buff == 'd') {
+                char *p = itoa(va_arg(args, int));
+                __writes(p);
+                kfree(p);
+                readyToFormat = 0;
+            } else if (buff == 'c') {
+                writec((char) va_arg(args, int));
+                readyToFormat = 0;
+            }
+        } else {
+            if (*fmt == '%')
+                readyToFormat = 1;
+            else
+                writec(*fmt);
+        }
+    }
+}
\ No newline at end of file
-- 
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