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file.c

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    Paul Sokolovsky authored
    Well, Python3 also defines an attribute for that, but that's bloat.
    acb13886
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    file.c 4.66 KiB
    #include <stdio.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include <errno.h>
    #include <sys/stat.h>
    #include <sys/types.h>
    
    #include "nlr.h"
    #include "misc.h"
    #include "mpconfig.h"
    #include "qstr.h"
    #include "obj.h"
    #include "runtime.h"
    #include "stream.h"
    
    typedef struct _mp_obj_fdfile_t {
        mp_obj_base_t base;
        int fd;
    } mp_obj_fdfile_t;
    
    STATIC const mp_obj_type_t rawfile_type;
    
    STATIC void fdfile_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
        mp_obj_fdfile_t *self = self_in;
        print(env, "<io.FileIO %d>", self->fd);
    }
    
    STATIC machine_int_t fdfile_read(mp_obj_t o_in, void *buf, machine_uint_t size, int *errcode) {
        mp_obj_fdfile_t *o = o_in;
        machine_int_t r = read(o->fd, buf, size);
        if (r == -1) {
            *errcode = errno;
        }
        return r;
    }
    
    STATIC machine_int_t fdfile_write(mp_obj_t o_in, const void *buf, machine_uint_t size, int *errcode) {
        mp_obj_fdfile_t *o = o_in;
        machine_int_t r = write(o->fd, buf, size);
        if (r == -1) {
            *errcode = errno;
        }
        return r;
    }
    
    STATIC mp_obj_t fdfile_close(mp_obj_t self_in) {
        mp_obj_fdfile_t *self = self_in;
        close(self->fd);
        return mp_const_none;
    }
    STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_close_obj, fdfile_close);
    
    mp_obj_t fdfile___exit__(uint n_args, const mp_obj_t *args) {
        return fdfile_close(args[0]);
    }
    STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(fdfile___exit___obj, 4, 4, fdfile___exit__);
    
    STATIC mp_obj_t fdfile_fileno(mp_obj_t self_in) {
        mp_obj_fdfile_t *self = self_in;
        return MP_OBJ_NEW_SMALL_INT((machine_int_t)self->fd);
    }
    STATIC MP_DEFINE_CONST_FUN_OBJ_1(fdfile_fileno_obj, fdfile_fileno);
    
    STATIC mp_obj_fdfile_t *fdfile_new(int fd) {
        mp_obj_fdfile_t *o = m_new_obj(mp_obj_fdfile_t);
        o->base.type = &rawfile_type;
        o->fd = fd;
        return o;
    }
    
    STATIC mp_obj_t fdfile_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
        mp_obj_fdfile_t *o = m_new_obj(mp_obj_fdfile_t);
        o->base.type = type_in;
    
        if (MP_OBJ_IS_SMALL_INT(args[0])) {
            o->fd = MP_OBJ_SMALL_INT_VALUE(args[0]);
            return o;
        }
    
        const char *fname = mp_obj_str_get_str(args[0]);
        const char *mode_s;
        if (n_args > 1) {
            mode_s = mp_obj_str_get_str(args[1]);
        } else {
            mode_s = "r";
        }
    
        int mode = 0;
        while (*mode_s) {
            switch (*mode_s++) {
                // Note: these assume O_RDWR = O_RDONLY | O_WRONLY
                case 'r':
                    mode |= O_RDONLY;
                    break;
                case 'w':
                    mode |= O_WRONLY | O_CREAT | O_TRUNC;
                    break;
                case 'a':
                    mode |= O_APPEND;
                    break;
                case '+':
                    mode |= O_RDWR;
                    break;
            }
        }
    
        int fd = open(fname, mode, 0644);
        if (fd == -1) {
            nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(errno)));
        }
        return fdfile_new(fd);
    }
    
    STATIC const mp_map_elem_t rawfile_locals_dict_table[] = {
        { MP_OBJ_NEW_QSTR(MP_QSTR_fileno), (mp_obj_t)&fdfile_fileno_obj },
        { MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
        { MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
        { MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
        { MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
        { MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&fdfile_close_obj },
        { MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
        { MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&fdfile___exit___obj },
    };
    
    STATIC MP_DEFINE_CONST_DICT(rawfile_locals_dict, rawfile_locals_dict_table);
    
    STATIC const mp_stream_p_t rawfile_stream_p = {
        .read = fdfile_read,
        .write = fdfile_write,
    };
    
    STATIC const mp_obj_type_t rawfile_type = {
        { &mp_type_type },
        .name = MP_QSTR_FileIO,
        .print = fdfile_print,
        .make_new = fdfile_make_new,
        .getiter = mp_identity,
        .iternext = mp_stream_unbuffered_iter,
        .stream_p = &rawfile_stream_p,
        .locals_dict = (mp_obj_t)&rawfile_locals_dict,
    };
    
    // Factory function for I/O stream classes
    mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args) {
        // TODO: analyze mode and buffering args and instantiate appropriate type
        return fdfile_make_new((mp_obj_t)&rawfile_type, n_args, 0, args);
    }
    MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_open_obj, 1, 2, mp_builtin_open);
    
    const mp_obj_fdfile_t mp_sys_stdin_obj  = { .base = {&rawfile_type}, .fd = STDIN_FILENO };
    const mp_obj_fdfile_t mp_sys_stdout_obj = { .base = {&rawfile_type}, .fd = STDOUT_FILENO };
    const mp_obj_fdfile_t mp_sys_stderr_obj = { .base = {&rawfile_type}, .fd = STDERR_FILENO };