From 2c08de044fa97d91c6ee1995ebd4140b3877c7fd Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Thu, 3 Nov 2022 20:20:22 +0100
Subject: [PATCH] Kernel, libc: Add support for querying the framebuffer's
 scanline via ioctl()

---
 kernel/src/fs/devices/Framebuffer.cpp | 33 ++++++++++++---------------
 libs/libc/include/sys/ioctl.h         |  2 ++
 2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/kernel/src/fs/devices/Framebuffer.cpp b/kernel/src/fs/devices/Framebuffer.cpp
index cd198508..b6175650 100644
--- a/kernel/src/fs/devices/Framebuffer.cpp
+++ b/kernel/src/fs/devices/Framebuffer.cpp
@@ -1,12 +1,12 @@
 #include "fs/devices/Framebuffer.h"
+#include "bootboot.h"
+#include "memory/MemoryManager.h"
+#include "misc/utils.h"
+#include "std/errno.h"
 #include "std/stdio.h"
 #include "std/stdlib.h"
 #include "std/string.h"
-#include "memory/MemoryManager.h"
 #include "utils/Addresses.h"
-#include "misc/utils.h"
-#include "std/errno.h"
-#include "bootboot.h"
 
 extern BOOTBOOT bootboot;
 extern char fb[1];
@@ -36,39 +36,36 @@ uintptr_t FramebufferDevice::mmap(VFS::Node* node, uintptr_t addr, size_t size,
 {
     if (!node) return -1;
     int real_prot = prot & ~(MAP_AS_OWNED_BY_TASK);
-    if(round_down_to_nearest_page(offset) != (uintptr_t)offset)
-    {
-        return MAP_FAIL(EINVAL);
-    }
-    if((size + offset) > bootboot.fb_size)
+    if (round_down_to_nearest_page(offset) != (uintptr_t)offset) { return MAP_FAIL(EINVAL); }
+    if ((size + offset) > bootboot.fb_size)
     {
         return MAP_FAIL(ERANGE); // FIXME: Should probably be EOVERFLOW.
     }
-    MemoryManager::map_several_pages(bootboot.fb_ptr + offset, addr, Utilities::get_blocks_from_size(PAGE_SIZE, size), real_prot);
+    MemoryManager::map_several_pages(bootboot.fb_ptr + offset, addr, Utilities::get_blocks_from_size(PAGE_SIZE, size),
+                                     real_prot);
     return addr;
 }
 
 ssize_t FramebufferDevice::write(VFS::Node* node, size_t offset, size_t size, const char* buffer)
 {
     if (!node) return -1;
-    if((size + offset) > (uint64_t)bootboot.fb_size)
-    {
-        size = (uint64_t)bootboot.fb_size - offset;
-    }
+    if ((size + offset) > (uint64_t)bootboot.fb_size) { size = (uint64_t)bootboot.fb_size - offset; }
     memcpy(fb + offset, buffer, size);
     return (ssize_t)size;
 }
 
 #define FB_GET_WIDTH 0
 #define FB_GET_HEIGHT 1
+#define FB_GET_SCANLINE 2
 
 long FramebufferDevice::ioctl(VFS::Node* node, int cmd, uintptr_t)
 {
     if (!node) return -1;
-    switch(cmd)
+    switch (cmd)
     {
-        case FB_GET_WIDTH: return (long)bootboot.fb_width;
-        case FB_GET_HEIGHT: return (long)bootboot.fb_height;
-        default: return -EINVAL;
+    case FB_GET_WIDTH: return (long)bootboot.fb_width;
+    case FB_GET_HEIGHT: return (long)bootboot.fb_height;
+    case FB_GET_SCANLINE: return (long)bootboot.fb_scanline;
+    default: return -EINVAL;
     }
 }
\ No newline at end of file
diff --git a/libs/libc/include/sys/ioctl.h b/libs/libc/include/sys/ioctl.h
index 1c1cb1e9..2de4dac5 100644
--- a/libs/libc/include/sys/ioctl.h
+++ b/libs/libc/include/sys/ioctl.h
@@ -7,6 +7,8 @@
 #define FB_GET_WIDTH 0
 /* Get the height of a framebuffer device. */
 #define FB_GET_HEIGHT 1
+/* Get the scanline of a framebuffer device. */
+#define FB_GET_SCANLINE 2
 
 #ifdef __cplusplus
 extern "C"