From a92be498517e316d6deaf42dbd51a3c9e28899ca Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 31 Jul 2023 11:13:27 -0700
Subject: [PATCH] Revert "Merge pull request #15317 from
 devnexen/darwin_rand_nativegen"

This reverts commit a11113097730693fb915114cec79df9cb4adcc93, reversing
changes made to 9f3f9fb40f605de2f2bdcd0ce7a396e06b8b8c0d.
---
 lib/std/c/darwin.zig | 28 ----------------------------
 lib/std/os.zig       | 15 ++-------------
 2 files changed, 2 insertions(+), 41 deletions(-)

diff --git a/lib/std/c/darwin.zig b/lib/std/c/darwin.zig
index 38cddef0fa..e2029391a9 100644
--- a/lib/std/c/darwin.zig
+++ b/lib/std/c/darwin.zig
@@ -895,35 +895,7 @@ pub extern "c" fn pthread_attr_get_qos_class_np(attr: *pthread_attr_t, qos_class
 pub extern "c" fn pthread_set_qos_class_self_np(qos_class: qos_class_t, relative_priority: c_int) c_int;
 pub extern "c" fn pthread_get_qos_class_np(pthread: std.c.pthread_t, qos_class: *qos_class_t, relative_priority: *c_int) c_int;
 
-pub const CCryptorStatus = enum(i32) {
-    /// Operation completed
-    kCCSuccess = 0,
-    /// Illegal parameter
-    kCCParamError = -4300,
-    /// Provided buffer too small
-    kCCBufferTooSmall = -4301,
-    /// Failed memory allocation
-    kCCMemoryFailure = -4302,
-    /// Size alignment issue
-    kCCAlignmentError = -4303,
-    /// Decoding issue
-    kCCDecodeError = -4304,
-    /// Call not implemented
-    kCCUnimplemented = -4305,
-    kCCOverflow = -4306,
-    kCCRNGFailure = -4307,
-    /// Unspecified error
-    kCCUnspecifiedError = -4308,
-    kCCCallSequenceError = -4309,
-    kCCKeySizeError = -4310,
-    /// Invalid key
-    kCCInvalidKey = -4311,
-};
-
-pub const CCRNGStatus = CCryptorStatus;
-
 pub extern "c" fn arc4random_buf(buf: [*]u8, len: usize) void;
-pub extern "c" fn CCRandomGenerateBytes(bytes: ?*anyopaque, count: usize) CCRNGStatus;
 
 // Grand Central Dispatch is exposed by libSystem.
 pub extern "c" fn dispatch_release(object: *anyopaque) void;
diff --git a/lib/std/os.zig b/lib/std/os.zig
index dbcff656d6..8696e47c7d 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -517,18 +517,7 @@ pub fn getrandom(buffer: []u8) GetRandomError!void {
         return;
     }
     switch (builtin.os.tag) {
-        .macos, .ios => {
-            const rc = darwin.CCRandomGenerateBytes(buffer.ptr, buffer.len);
-            if (rc != darwin.CCRNGStatus.kCCSuccess) {
-                if (rc == darwin.CCRNGStatus.kCCParamError or rc == darwin.CCRNGStatus.kCCBufferTooSmall) {
-                    return error.InvalidHandle;
-                } else {
-                    return error.SystemResources;
-                }
-            }
-            return;
-        },
-        .netbsd, .openbsd, .tvos, .watchos => {
+        .netbsd, .openbsd, .macos, .ios, .tvos, .watchos => {
             system.arc4random_buf(buffer.ptr, buffer.len);
             return;
         },
@@ -1001,7 +990,7 @@ pub fn preadv(fd: fd_t, iov: []const iovec, offset: u64) PReadError!usize {
     if (have_pread_but_not_preadv) {
         // We could loop here; but proper usage of `preadv` must handle partial reads anyway.
         // So we simply read into the first vector only.
-        if (iov.len == 0) return @as(usize, @intCast(0));
+        if (iov.len == 0) return 0;
         const first = iov[0];
         return pread(fd, first.iov_base[0..first.iov_len], offset);
     }