some modify

text.c

@@ -57,6 +57,11 @@ void textinit(EFI_SIMPLE_FILE_SYSTEM_PROTOCOL* fsp) {
 
 void textout(UINT8 code) {
     static UINTN x = 0, y = 0;
+    if (code == '\n') {
+        x = 0;
+        y++;
+        return;
+    }
     for (int row = 0; row < 13; row++) {
         for (int column = 0; column < 8; column++) {
             EFI_GRAPHICS_OUTPUT_BLT_PIXEL *pixel =
@@ -64,7 +69,7 @@ void textout(UINT8 code) {
                 y * 13 * buffer.HorizontalRes + row * buffer.HorizontalRes +
                 8 * x + column;
             if ((font[code][row] >> (7 - column)) & 0x1)
-                RGBtoPixel(pixel, 0x00FF00);
+                RGBtoPixel(pixel, 0xFFFFFF);
         }
     }
     if (x < (buffer.HorizontalRes / 8) - 1)
@@ -73,4 +78,50 @@ void textout(UINT8 code) {
         x = 0;
         y++;
     }
-}
+}
+
+void print(char *string) {
+    do {
+        textout(*string);
+        string++;
+    } while (*string != '\0');
+}
+
+UINT64 pow(UINT64 base, UINT64 exponent) {
+    UINT64 ans = 1;
+    for (UINT64 i = 0; i < exponent; i++) {
+        ans *= base;
+    }
+    return ans;
+}
+
+void printhex(UINT64 num, UINT8 digit) {
+    if (digit == 0) {
+        UINT8 maxdigit = 0;
+        while (num >= pow(16, maxdigit)) maxdigit++;
+        print("0x");
+        if (maxdigit == 0) textout('0' + num);
+        while (maxdigit) {
+            UINT64 weight = pow(16, maxdigit - 1);
+            UINT64 ans = num / weight;
+            if (ans < 10)
+                textout('0' + ans);
+            else
+                textout('A' + ans - 10);
+            num -= ans * weight;
+            maxdigit--;
+        }
+    } else {
+        print("0x");
+        while (digit) {
+            UINT64 weight = pow(16, digit - 1);
+            UINT64 ans = num / weight;
+            if (ans < 10)
+                textout('0' + ans);
+            else
+                textout('A' + ans - 10);
+            num -= ans * weight;
+            digit--;
+        }
+    }
+}