1 files changed, 124 insertions, 0 deletions
diff --git a/py/moderrno.c b/py/moderrno.c
new file mode 100644
index 0000000000..99ca101bd6
--- /dev/null
+++ b/py/moderrno.c
@@ -0,0 +1,124 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "py/obj.h"
+#include "py/mperrno.h"
+
+#if MICROPY_PY_ERRNO
+
+// This list can be defined per port in mpconfigport.h to tailor it to a
+// specific port's needs.  If it's not defined then we provide a default.
+#ifndef MICROPY_PY_ERRNO_LIST
+#define MICROPY_PY_ERRNO_LIST \
+    X(EPERM) \
+    X(ENOENT) \
+    X(EIO) \
+    X(EBADF) \
+    X(EAGAIN) \
+    X(ENOMEM) \
+    X(EACCES) \
+    X(EEXIST) \
+    X(ENODEV) \
+    X(EISDIR) \
+    X(EINVAL) \
+    X(EOPNOTSUPP) \
+    X(EADDRINUSE) \
+    X(ECONNABORTED) \
+    X(ECONNRESET) \
+    X(ENOBUFS) \
+    X(ENOTCONN) \
+    X(ETIMEDOUT) \
+    X(ECONNREFUSED) \
+    X(EHOSTUNREACH) \
+    X(EALREADY) \
+    X(EINPROGRESS) \
+
+#endif
+
+#if MICROPY_PY_ERRNO_ERRORCODE
+STATIC const mp_rom_map_elem_t errorcode_table[] = {
+    #define X(e) { MP_ROM_INT(MP_##e), MP_ROM_QSTR(MP_QSTR_##e) },
+    MICROPY_PY_ERRNO_LIST
+#undef X
+};
+
+STATIC const mp_obj_dict_t errorcode_dict = {
+    .base = {&mp_type_dict},
+    .map = {
+        .all_keys_are_qstrs = 0, // keys are integers
+        .is_fixed = 1,
+        .is_ordered = 1,
+        .used = MP_ARRAY_SIZE(errorcode_table),
+        .alloc = MP_ARRAY_SIZE(errorcode_table),
+        .table = (mp_map_elem_t *)(mp_rom_map_elem_t *)errorcode_table,
+    },
+};
+#endif
+
+STATIC const mp_rom_map_elem_t mp_module_errno_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_errno) },
+    #if MICROPY_PY_ERRNO_ERRORCODE
+    { MP_ROM_QSTR(MP_QSTR_errorcode), MP_ROM_PTR(&errorcode_dict) },
+    #endif
+
+    #define X(e) { MP_ROM_QSTR(MP_QSTR_##e), MP_ROM_INT(MP_##e) },
+    MICROPY_PY_ERRNO_LIST
+#undef X
+};
+
+STATIC MP_DEFINE_CONST_DICT(mp_module_errno_globals, mp_module_errno_globals_table);
+
+const mp_obj_module_t mp_module_errno = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&mp_module_errno_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_errno, mp_module_errno);
+
+qstr mp_errno_to_str(mp_obj_t errno_val) {
+    #if MICROPY_PY_ERRNO_ERRORCODE
+    // We have the errorcode dict so can do a lookup using the hash map
+    mp_map_elem_t *elem = mp_map_lookup((mp_map_t *)&errorcode_dict.map, errno_val, MP_MAP_LOOKUP);
+    if (elem == NULL) {
+        return MP_QSTRnull;
+    } else {
+        return MP_OBJ_QSTR_VALUE(elem->value);
+    }
+    #else
+    // We don't have the errorcode dict so do a simple search in the modules dict
+    for (size_t i = 0; i < MP_ARRAY_SIZE(mp_module_errno_globals_table); ++i) {
+        if (errno_val == mp_module_errno_globals_table[i].value) {
+            return MP_OBJ_QSTR_VALUE(mp_module_errno_globals_table[i].key);
+        }
+    }
+    return MP_QSTRnull;
+    #endif
+}
+
+#endif // MICROPY_PY_ERRNO