Added userspace libc and began userspace based shell

1 files changed, 53 insertions, 0 deletions

diff --git a/src/userspace/mlibc/stdio/vprintf.c b/src/userspace/mlibc/stdio/vprintf.c
new file mode 100644
index 0000000..92999b6
--- /dev/null
+++ b/src/userspace/mlibc/stdio/vprintf.c
@@ -0,0 +1,53 @@
+#include <stdarg.h>
+#include <stdint.h>
+#include <mlibc/stdio.h>
+#include <mlibc/string.h>
+#include <mlibc/stdlib.h>
+#include <mlibc/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