1 files changed, 33 insertions, 0 deletions
diff --git a/kernel/vsprintf.c b/kernel/vsprintf.c
index f3feb43..ed2d8be 100644
--- a/kernel/vsprintf.c
+++ b/kernel/vsprintf.c
@@ -1,7 +1,17 @@
 #include <stdarg.h>
+#include <stdint.h>
+
+enum TYPE {
+  TYPE_INT    = 1,
+  TYPE_UINT   = 2,
+  TYPE_HEX    = 3,
+  TYPE_STRING = 4
+};
 
 int vsprintf(char *str, char *fmt, va_list ap) {
+  char *s;
   char *start = str;
+  uint8_t type;
 
   while(*fmt) {
     if(*fmt != '%') {
@@ -10,6 +20,29 @@ int vsprintf(char *str, char *fmt, va_list ap) {
     }
 
     fmt++;
+    while(1) {
+      switch(*fmt) {
+        case 's':
+          if(type)
+            goto done;
+          type = TYPE_STRING;
+          break;
+        default:
+          goto done;
+          break;
+      }
+      fmt++;
+    }
+
+done:
+
+    switch(type) {
+      case TYPE_STRING:
+        s = va_arg(ap, char*);
+        while(*s)
+          *str++ = *s++;
+        break;
+    }
   }
 
   *str = 0;