circuitpython/py/moduerrno.c

/*
 * 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"

#include "supervisor/shared/translate.h"

// 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_UERRNO_LIST
#define MICROPY_PY_UERRNO_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_UERRNO

#if MICROPY_PY_UERRNO_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_UERRNO_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_uerrno_globals_table[] = {
#if CIRCUITPY
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_errno) },
#else
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uerrno) },
#endif
    #if MICROPY_PY_UERRNO_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_UERRNO_LIST
    #undef X
};

STATIC MP_DEFINE_CONST_DICT(mp_module_uerrno_globals, mp_module_uerrno_globals_table);

const mp_obj_module_t mp_module_uerrno = {
    .base = { &mp_type_module },
    .globals = (mp_obj_dict_t*)&mp_module_uerrno_globals,
};

const char* mp_errno_to_str(mp_obj_t errno_val) {
    // Otherwise, return the Exxxx string for that error code
    #if MICROPY_PY_UERRNO_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 "";
    } else {
        return qstr_str(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_uerrno_globals_table); ++i) {
        if (errno_val == mp_module_uerrno_globals_table[i].value) {
            return qstr_str(MP_OBJ_QSTR_VALUE(mp_module_uerrno_globals_table[i].key));
        }
    }
    return "";
    #endif
}

#else //MICROPY_PY_UERRNO

const char* mp_errno_to_str(mp_obj_t errno_val) {
    int v = MP_OBJ_SMALL_INT_VALUE(errno_val);
    #define X(e) if (v == e) return qstr_str(MP_QSTR_ ## e);
    MICROPY_PY_UERRNO_LIST
    #undef X

    return "";
}

#endif //MICROPY_PY_UERRNO


// For commonly encountered errors, return human readable strings, otherwise try errno name
const char *mp_common_errno_to_str(mp_obj_t errno_val, char *buf, size_t len) {
    if (!MP_OBJ_IS_SMALL_INT(errno_val)) {
        return NULL;
    }

    const compressed_string_t* desc = NULL;
    switch (MP_OBJ_SMALL_INT_VALUE(errno_val)) {
        case EPERM:  desc = translate("Permission denied"); break;
        case ENOENT: desc = translate("No such file/directory"); break;
        case EIO:    desc = translate("Input/output error"); break;
        case EACCES: desc = translate("Permission denied"); break;
        case EEXIST: desc = translate("File exists"); break;
        case ENODEV: desc = translate("Unsupported operation"); break;
        case EINVAL: desc = translate("Invalid argument"); break;
        case ENOSPC: desc = translate("No space left on device"); break;
        case EROFS:  desc = translate("Read-only filesystem"); break;
    }
    if (desc != NULL && decompress_length(desc) <= len) {
        decompress(desc, buf);
        return buf;
    }

    const char *msg = mp_errno_to_str(errno_val);
    return msg[0] != '\0' ? msg : NULL;
}