From 8a5b39f734d63c65d4dc07cbf20e2e3b7a41a0b1 Mon Sep 17 00:00:00 2001
From: Vitalii Kravchenko <vitalyx@gmail.com>
Date: Sun, 2 Oct 2022 07:40:28 +0100
Subject: [PATCH 1/2] Darwin: allow reading/writing files larger than max(i32)

---
 core/os/os_darwin.odin | 42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/core/os/os_darwin.odin b/core/os/os_darwin.odin
index 5c2cf8ec2..9dbb73a25 100644
--- a/core/os/os_darwin.odin
+++ b/core/os/os_darwin.odin
@@ -369,27 +369,45 @@ close :: proc(fd: Handle) -> bool {
 	return _unix_close(fd) == 0
 }
 
+@(private)
+MAX_RW :: 0x7fffffff // The limit on Darwin is max(i32), trying to read/write more than that fails.
+
 write :: proc(fd: Handle, data: []u8) -> (int, Errno) {
 	assert(fd != -1)
 
-	if len(data) == 0 {
-		return 0, 0
-	}
-	bytes_written := _unix_write(fd, raw_data(data), len(data))
-	if bytes_written == -1 {
-		return 0, 1
-	}
-	return bytes_written, 0
+    bytes_total := len(data)
+    bytes_written_total := 0
+
+    for bytes_written_total < bytes_total {
+		bytes_to_write := min(bytes_total - bytes_written_total, MAX_RW)
+        slice := data[bytes_written_total:bytes_written_total + bytes_to_write]
+        bytes_written := _unix_write(fd, raw_data(slice), bytes_to_write)
+        if bytes_written == -1 {
+            return bytes_written_total, 1
+        }
+        bytes_written_total += bytes_written
+    }
+
+	return bytes_written_total, 0
 }
 
 read :: proc(fd: Handle, data: []u8) -> (int, Errno) {
 	assert(fd != -1)
 
-	bytes_read := _unix_read(fd, raw_data(data), len(data))
-	if bytes_read == -1 {
-		return 0, 1
+	bytes_total := len(data)
+	bytes_read_total := 0
+
+	for bytes_read_total < bytes_total {
+		bytes_to_read := min(bytes_total - bytes_read_total, MAX_RW)
+		slice := data[bytes_read_total:bytes_read_total + bytes_to_read]
+		bytes_read := _unix_read(fd, raw_data(slice), bytes_to_read)
+		if bytes_read == -1 {
+			return bytes_read_total, 1
+		}
+		bytes_read_total += bytes_read
 	}
-	return bytes_read, 0
+
+	return bytes_read_total, 0
 }
 
 seek :: proc(fd: Handle, offset: i64, whence: int) -> (i64, Errno) {

From d52a9b61af066deaa29398bb4195418f2817e42c Mon Sep 17 00:00:00 2001
From: Vitalii Kravchenko <vitalyx@gmail.com>
Date: Sun, 2 Oct 2022 07:47:22 +0100
Subject: [PATCH 2/2] Fix indentation

---
 core/os/os_darwin.odin | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/core/os/os_darwin.odin b/core/os/os_darwin.odin
index 9dbb73a25..ac7376752 100644
--- a/core/os/os_darwin.odin
+++ b/core/os/os_darwin.odin
@@ -375,18 +375,18 @@ MAX_RW :: 0x7fffffff // The limit on Darwin is max(i32), trying to read/write mo
 write :: proc(fd: Handle, data: []u8) -> (int, Errno) {
 	assert(fd != -1)
 
-    bytes_total := len(data)
-    bytes_written_total := 0
+	bytes_total := len(data)
+	bytes_written_total := 0
 
-    for bytes_written_total < bytes_total {
+	for bytes_written_total < bytes_total {
 		bytes_to_write := min(bytes_total - bytes_written_total, MAX_RW)
-        slice := data[bytes_written_total:bytes_written_total + bytes_to_write]
-        bytes_written := _unix_write(fd, raw_data(slice), bytes_to_write)
-        if bytes_written == -1 {
-            return bytes_written_total, 1
-        }
-        bytes_written_total += bytes_written
-    }
+		slice := data[bytes_written_total:bytes_written_total + bytes_to_write]
+		bytes_written := _unix_write(fd, raw_data(slice), bytes_to_write)
+		if bytes_written == -1 {
+			return bytes_written_total, 1
+		}
+		bytes_written_total += bytes_written
+	}
 
 	return bytes_written_total, 0
 }