From 7acf66de3ef893100d469c115054409d95506117 Mon Sep 17 00:00:00 2001
From: Max Wash <max@doorstuck.net>
Date: Thu, 30 Apr 2020 17:46:06 +0100
Subject: [PATCH] Added errno.h and ptrdiff_t

---
 photon/libc/errno/errno.c    |  9 +++++++++
 photon/libc/include/errno.h  | 18 ++++++++++++++++++
 photon/libc/include/stddef.h | 12 ++++++++++--
 3 files changed, 37 insertions(+), 2 deletions(-)
 create mode 100644 photon/libc/errno/errno.c
 create mode 100644 photon/libc/include/errno.h

diff --git a/photon/libc/errno/errno.c b/photon/libc/errno/errno.c
new file mode 100644
index 0000000..db94f50
--- /dev/null
+++ b/photon/libc/errno/errno.c
@@ -0,0 +1,9 @@
+
+
+/* XXX This isn't thread safe */
+static int __errno = 0;
+
+int *__errno_location(void)
+{
+    return &__errno;
+}
diff --git a/photon/libc/include/errno.h b/photon/libc/include/errno.h
new file mode 100644
index 0000000..b50e308
--- /dev/null
+++ b/photon/libc/include/errno.h
@@ -0,0 +1,18 @@
+#ifndef ERRNO_H_
+#define ERRNO_H_
+
+#include <sys/_errno.h>
+
+#define errno (*__errno_location())
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+extern int *__errno_location(void);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
diff --git a/photon/libc/include/stddef.h b/photon/libc/include/stddef.h
index 594fd56..591a8ae 100644
--- a/photon/libc/include/stddef.h
+++ b/photon/libc/include/stddef.h
@@ -10,13 +10,21 @@
 extern "C" {
 #endif /* defined(__cplusplus) */
 
+#ifndef __ptrdiff_t_defined
+#define __ptrdiff_t_defined
 typedef __intptr_t ptrdiff_t;
+#endif
 
-#ifndef __SIZE_T_DEFINED
-#define __SIZE_T_DEFINED
+#ifndef __size_t_defined
+#define __size_t_defined
 typedef __uintptr_t size_t;
 #endif
 
+#ifndef __ssize_t_defined
+#define __ssize_t_defined
+typedef __intptr_t ssize_t;
+#endif
+
 #if defined(__cplusplus)
 }
 #endif /* defined(__cplusplus) */