3 files changed, 38 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 156ef2a..3ca5ab2 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ include config.mk
 CFLAGS=-g -I$(INCLUDEDIR) -nostdinc -fno-builtin
 LDFLAGS=-L$(LIBDIR) $(LIBS)
 
-TESTOBJS=main.o test.o assert.o ctype.o locale.o
+TESTOBJS=main.o test.o assert.o ctype.o locale.o errno.o
 
 testlibc: $(TESTOBJS) $(LIBDIR)/libc.a
 	$(CC) -o $@ $(TESTOBJS) $(LDFLAGS)
@@ -16,6 +16,8 @@ ctype.o: ctype.c test.h
 
 locale.o: locale.c test.h
 
+errno.o: errno.c test.h
+
 test.o: test.c test.h
 
 main.o: main.c test.h
diff --git a/errno.c b/errno.c
new file mode 100644
index 0000000..63e003c
--- /dev/null
+++ b/errno.c
@@ -0,0 +1,34 @@
+#include <errno.h>
+#include "test.h"
+
+#ifndef EDOM
+#error EDOM not defined
+#endif
+
+#ifndef ERANGE
+#error ERANGE not defined
+#endif
+
+#if __STDC_VERSION__ >= 199409
+#ifndef EILSEQ
+#error EILSEQ not defined
+#endif
+#endif
+
+void test_errno(void)
+{
+	struct lconv *lc;
+	int errno_values[] = {
+		EDOM,
+		ERANGE,
+		#ifdef EILSEQ
+		EILSEQ,
+		#endif
+	};
+
+	testing_header("errno.h");
+
+	test_distinct(errno_values);
+
+	testing_end();
+}
diff --git a/main.c b/main.c
index be6fc76..665aab2 100644
--- a/main.c
+++ b/main.c
@@ -9,6 +9,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	test_errno();
 	test_ctype();
 	test_locale();
 	return 0;