5 files changed, 57 insertions, 0 deletions
diff --git a/src/errno/EDOM.c b/src/errno/EDOM.c
new file mode 100644
index 00000000..927df956
--- /dev/null
+++ b/src/errno/EDOM.c
@@ -0,0 +1,10 @@
+#include <errno.h>
+#define EDOM                                                                 (1)
+/** domain error **/
+/***
+is used to indicate that an argument supplied to a function is outside the
+defined input domain.
+***/
+/*
+STDC(1)
+*/
diff --git a/src/errno/EILSEQ.c b/src/errno/EILSEQ.c
new file mode 100644
index 00000000..cb8f42e7
--- /dev/null
+++ b/src/errno/EILSEQ.c
@@ -0,0 +1,7 @@
+#include <errno.h>
+#define EILSEQ                                                               (3)
+/** Illegal sequence / Illegal byte sequence **/
+
+/*
+STDC(199409)
+*/
diff --git a/src/errno/ERANGE.c b/src/errno/ERANGE.c
new file mode 100644
index 00000000..70b47572
--- /dev/null
+++ b/src/errno/ERANGE.c
@@ -0,0 +1,9 @@
+#include <errno.h>
+#define ERANGE                                                               (2)
+/** out of range **/
+/***
+used to indicated that the result of an operation is too large or too small.
+***/
+/*
+STDC(1)
+*/
diff --git a/src/errno/__errno.c b/src/errno/__errno.c
new file mode 100644
index 00000000..c46c86c7
--- /dev/null
+++ b/src/errno/__errno.c
@@ -0,0 +1,8 @@
+#include <errno.h>
+#include "nonstd/internal.h"
+
+int *__errno(void)
+{
+        return __libc(ERRNO);
+}
+
diff --git a/src/errno/errno.c b/src/errno/errno.c
new file mode 100644
index 00000000..007526b8
--- /dev/null
+++ b/src/errno/errno.c
@@ -0,0 +1,23 @@
+#include <errno.h>
+#define errno                                                       (*__errno())
+
+/** get system errors **/
+
+/***
+is a modifiable lvalue of type TYPE(int) which is used to
+indicate errors in standard library functions. It may be a macro or an
+identifier with external linkage. It is initialized to 0 at program start,
+but no function in the standard library will set it to 0. Library functions
+may set it to a non-zero value if its use is not documented in their
+description.
+***/
+
+/*
+UNSPECIFIED(Whether THIS() is declared as a macro or an identifier with external linkage (C89, C95, and C99 only))
+UNDEFINED(A macro definition of THIS() is suppressed)
+UNDEFINED(A program defines an identifier named THIS())
+*/
+
+/*
+STDC(1)
+*/