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modtermios.c

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  • modtermios.c 5.48 KiB
    /*
     * This file is part of the Micro Python project, http://micropython.org/
     *
     * The MIT License (MIT)
     *
     * Copyright (c) 2014 Paul Sokolovsky
     *
     * 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 <sys/types.h>
    #include <termios.h>
    #include <unistd.h>
    #include <errno.h>
    
    #include "py/objlist.h"
    #include "py/runtime.h"
    #include "py/mphal.h"
    
    STATIC mp_obj_t mod_termios_tcgetattr(mp_obj_t fd_in) {
        struct termios term;
        int fd = mp_obj_get_int(fd_in);
    
        int res = tcgetattr(fd, &term);
        RAISE_ERRNO(res, errno);
    
        mp_obj_list_t *r = MP_OBJ_TO_PTR(mp_obj_new_list(7, NULL));
        r->items[0] = MP_OBJ_NEW_SMALL_INT(term.c_iflag);
        r->items[1] = MP_OBJ_NEW_SMALL_INT(term.c_oflag);
        r->items[2] = MP_OBJ_NEW_SMALL_INT(term.c_cflag);
        r->items[3] = MP_OBJ_NEW_SMALL_INT(term.c_lflag);
        r->items[4] = MP_OBJ_NEW_SMALL_INT(cfgetispeed(&term));
        r->items[5] = MP_OBJ_NEW_SMALL_INT(cfgetospeed(&term));
    
        mp_obj_list_t *cc = MP_OBJ_TO_PTR(mp_obj_new_list(NCCS, NULL));
        r->items[6] = MP_OBJ_FROM_PTR(cc);
        for (int i = 0; i < NCCS; i++) {
            if (i == VMIN || i == VTIME) {
                cc->items[i] = MP_OBJ_NEW_SMALL_INT(term.c_cc[i]);
            } else {
                // https://docs.python.org/3/library/termios.html says value is *string*,
                // but no way unicode chars could be there, if c_cc is defined to be a
                // a "char". But it's type is actually cc_t, which can be anything.
                // TODO: For now, we still deal with it like that.
                cc->items[i] = mp_obj_new_bytes((byte*)&term.c_cc[i], 1);
            }
        }
        return MP_OBJ_FROM_PTR(r);
    }
    STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_termios_tcgetattr_obj, mod_termios_tcgetattr);
    
    STATIC mp_obj_t mod_termios_tcsetattr(mp_obj_t fd_in, mp_obj_t when_in, mp_obj_t attrs_in) {
        struct termios term;
        int fd = mp_obj_get_int(fd_in);
        int when = mp_obj_get_int(when_in);
        if (when == 0) {
            // We don't export TCSANOW and friends to save on code space. Then
            // common lazy sense says that passing 0 should be godo enough, and
            // it is e.g. for glibc. But for other libc's it's not, so set just
            // treat 0 as defauling to TCSANOW.
            when = TCSANOW;
        }
    
        assert(MP_OBJ_IS_TYPE(attrs_in, &mp_type_list));
        mp_obj_list_t *attrs = MP_OBJ_TO_PTR(attrs_in);
    
        term.c_iflag = mp_obj_get_int(attrs->items[0]);
        term.c_oflag = mp_obj_get_int(attrs->items[1]);
        term.c_cflag = mp_obj_get_int(attrs->items[2]);
        term.c_lflag = mp_obj_get_int(attrs->items[3]);
    
        mp_obj_list_t *cc = MP_OBJ_TO_PTR(attrs->items[6]);
        for (int i = 0; i < NCCS; i++) {
            if (i == VMIN || i == VTIME) {
                term.c_cc[i] = mp_obj_get_int(cc->items[i]);
            } else {
                term.c_cc[i] = *mp_obj_str_get_str(cc->items[i]);
            }
        }
    
        int res = cfsetispeed(&term, mp_obj_get_int(attrs->items[4]));
        RAISE_ERRNO(res, errno);
        res = cfsetispeed(&term, mp_obj_get_int(attrs->items[5]));
        RAISE_ERRNO(res, errno);
    
        res = tcsetattr(fd, when, &term);
        RAISE_ERRNO(res, errno);
        return mp_const_none;
    }
    STATIC MP_DEFINE_CONST_FUN_OBJ_3(mod_termios_tcsetattr_obj, mod_termios_tcsetattr);
    
    STATIC mp_obj_t mod_termios_setraw(mp_obj_t fd_in) {
        struct termios term;
        int fd = mp_obj_get_int(fd_in);
        int res = tcgetattr(fd, &term);
        RAISE_ERRNO(res, errno);
    
        term.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
        term.c_oflag = 0;
        term.c_cflag = (term.c_cflag & ~(CSIZE | PARENB)) | CS8;
        term.c_lflag = 0;
        term.c_cc[VMIN] = 1;
        term.c_cc[VTIME] = 0;
        res = tcsetattr(fd, TCSAFLUSH, &term);
        RAISE_ERRNO(res, errno);
        return mp_const_none;
    }
    STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_termios_setraw_obj, mod_termios_setraw);
    
    STATIC const mp_rom_map_elem_t mp_module_termios_globals_table[] = {
        { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_termios) },
        { MP_ROM_QSTR(MP_QSTR_tcgetattr), MP_ROM_PTR(&mod_termios_tcgetattr_obj) },
        { MP_ROM_QSTR(MP_QSTR_tcsetattr), MP_ROM_PTR(&mod_termios_tcsetattr_obj) },
        { MP_ROM_QSTR(MP_QSTR_setraw), MP_ROM_PTR(&mod_termios_setraw_obj) },
    
    #define C(name) { MP_ROM_QSTR(MP_QSTR_ ## name), MP_ROM_INT(name) }
        C(TCSANOW),
    
        C(B9600),
        #ifdef B57600
        C(B57600),
        #endif
        #ifdef B115200
        C(B115200),
        #endif
    #undef C
    };
    
    STATIC MP_DEFINE_CONST_DICT(mp_module_termios_globals, mp_module_termios_globals_table);
    
    const mp_obj_module_t mp_module_termios = {
        .base = { &mp_type_module },
        .globals = (mp_obj_dict_t*)&mp_module_termios_globals,
    };