diff options
Diffstat (limited to 'py/objstringio.c')
| -rw-r--r-- | py/objstringio.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/py/objstringio.c b/py/objstringio.c new file mode 100644 index 0000000000..cf39196aae --- /dev/null +++ b/py/objstringio.c @@ -0,0 +1,119 @@ +#include <stdio.h> +#include <string.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_stringio_t { + mp_obj_base_t base; + vstr_t *vstr; + // StringIO has single pointer used for both reading and writing + machine_uint_t pos; +} mp_obj_stringio_t; + +STATIC void stringio_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) { + mp_obj_stringio_t *self = self_in; + print(env, "<io.StringIO 0x%x>", self->vstr); +} + +STATIC machine_int_t stringio_read(mp_obj_t o_in, void *buf, machine_uint_t size, int *errcode) { + mp_obj_stringio_t *o = o_in; + machine_uint_t remaining = o->vstr->len - o->pos; + if (size > remaining) { + size = remaining; + } + memcpy(buf, o->vstr->buf + o->pos, size); + o->pos += size; + return size; +} + +STATIC machine_int_t stringio_write(mp_obj_t o_in, const void *buf, machine_uint_t size, int *errcode) { + mp_obj_stringio_t *o = o_in; + machine_uint_t remaining = o->vstr->alloc - o->pos; + if (size > remaining) { + // Take all what's already allocated... + o->vstr->len = o->vstr->alloc; + // ... and add more + vstr_add_len(o->vstr, size - remaining); + } + memcpy(o->vstr->buf + o->pos, buf, size); + o->pos += size; + if (o->pos > o->vstr->len) { + o->vstr->len = o->pos; + } + return size; +} + +STATIC mp_obj_t stringio_getvalue(mp_obj_t self_in) { + mp_obj_stringio_t *self = self_in; + return mp_obj_new_str((byte*)self->vstr->buf, self->vstr->len, false); +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_getvalue_obj, stringio_getvalue); + +STATIC mp_obj_t stringio_close(mp_obj_t self_in) { + mp_obj_stringio_t *self = self_in; + vstr_free(self->vstr); + self->vstr = NULL; + return mp_const_none; +} +STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_close_obj, stringio_close); + +mp_obj_t stringio___exit__(uint n_args, const mp_obj_t *args) { + return stringio_close(args[0]); +} +STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(stringio___exit___obj, 4, 4, stringio___exit__); + +STATIC mp_obj_stringio_t *stringio_new() { + mp_obj_stringio_t *o = m_new_obj(mp_obj_stringio_t); + o->base.type = &mp_type_stringio; + o->vstr = vstr_new(); + o->pos = 0; + return o; +} + +STATIC mp_obj_t stringio_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) { + mp_obj_stringio_t *o = stringio_new(); + + if (n_args > 0) { + mp_buffer_info_t bufinfo; + mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ); + stringio_write(o, bufinfo.buf, bufinfo.len, NULL); + // Cur ptr is always at the beginning of buffer at the construction + o->pos = 0; + } + return o; +} + +STATIC const mp_map_elem_t stringio_locals_dict_table[] = { + { 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)&stringio_close_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR_getvalue), (mp_obj_t)&stringio_getvalue_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj }, + { MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&stringio___exit___obj }, +}; + +STATIC MP_DEFINE_CONST_DICT(stringio_locals_dict, stringio_locals_dict_table); + +STATIC const mp_stream_p_t stringio_stream_p = { + .read = stringio_read, + .write = stringio_write, +}; + +const mp_obj_type_t mp_type_stringio = { + { &mp_type_type }, + .name = MP_QSTR_StringIO, + .print = stringio_print, + .make_new = stringio_make_new, + .getiter = mp_identity, + .iternext = mp_stream_unbuffered_iter, + .stream_p = &stringio_stream_p, + .locals_dict = (mp_obj_t)&stringio_locals_dict, +}; |