fx/core/stream.c

#include "printf.h"

#include <fx/core/bstr.h>
#include <fx/core/stream.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define READ_MAGIC(p)       (*(uint64_t *)p)
#define IS_BSTR(p)          (READ_MAGIC(p) == FX_BSTR_MAGIC)

#define FX_TYPE_STDIO_STREAM (fx_stdio_stream_get_type())

#define STREAM_DISPATCH_VIRTUAL(func, stream, ...)                             \
	do {                                                                   \
		struct stream_data _stream;                                    \
		enum fx_status status = stream_get_data(stream, &_stream);      \
		if (!FX_OK(status)) {                                           \
			return status;                                         \
		}                                                              \
		return func(&_stream, __VA_ARGS__);                            \
	} while (0)
#define STREAM_DISPATCH_VIRTUAL_0(func, stream)                                \
	do {                                                                   \
		struct stream_data _stream;                                    \
		enum fx_status status = stream_get_data(stream, &_stream);      \
		if (!FX_OK(status)) {                                           \
			return status;                                         \
		}                                                              \
		return func(&_stream);                                         \
	} while (0)

#define IDX_STDIN  0
#define IDX_STDOUT 1
#define IDX_STDERR 2

FX_DECLARE_TYPE(fx_stdio_stream);

FX_TYPE_CLASS_DECLARATION_BEGIN(fx_stdio_stream)
FX_TYPE_CLASS_DECLARATION_END(fx_stdio_stream)

/*** PRIVATE DATA *************************************************************/

typedef enum fx_stream_buffer_flags {
	FX_STREAM_BUFFER_F_NONE = 0x00u,
	FX_STREAM_BUFFER_F_DYNAMIC = 0x01u,
} fx_stream_buffer_flags;

struct fx_stream_p {
	int *s_istack;
	int s_add_indent;
	size_t s_istack_ptr, s_istack_size;
	void *s_ptr0, *s_ptr1;
};

struct fx_stdio_stream_p {
	FILE *s_fp;
};

struct fx_stream_buffer_p {
	fx_stream_buffer_flags p_flags;
	void *p_buf;
	size_t p_buf_len;
};

struct stream_data {
	fx_stream *s_obj;
	struct fx_stream_p *s_private;
	struct fx_stream_cfg *s_cfg;
	fx_stream_class *s_ops;
};

static fx_stream *stdio[] = {
	[IDX_STDIN] = NULL,
	[IDX_STDOUT] = NULL,
	[IDX_STDERR] = NULL,
};

/*** PRIVATE FUNCTIONS ********************************************************/

fx_type fx_stdio_stream_get_type(void);
static enum fx_status stdio_read(fx_stream *, void *, size_t, size_t *);
static enum fx_status stdio_write(fx_stream *, const void *, size_t, size_t *);
static enum fx_status stdio_seek(fx_stream *, long long, fx_stream_seek_origin);
static enum fx_status stdio_tell(const fx_stream *, size_t *);

static enum fx_status stream_get_data(const fx_stream *strp, struct stream_data *out)
{
	out->s_obj = (fx_stream *)strp;
	return fx_object_get_data(
		strp, FX_TYPE_STREAM, (void **)&out->s_private,
		(void **)&out->s_cfg, (void **)&out->s_ops);
}

static int current_indent(struct stream_data *stream)
{
	if (!stream->s_private->s_istack || !stream->s_private->s_istack_size) {
		return 0;
	}

	return stream->s_private->s_istack[stream->s_private->s_istack_ptr];
}

static size_t stream_cursor(const struct stream_data *stream)
{
	if (!stream || !stream->s_ops || !stream->s_ops->s_tell) {
		return FX_NPOS;
	}

	size_t p = FX_NPOS;
	fx_status status = stream->s_ops->s_tell(stream->s_obj, &p);
	if (!FX_OK(status)) {
		return FX_NPOS;
	}

	return p;
}

static enum fx_status stream_seek(
	struct stream_data *stream, long long offset, fx_stream_seek_origin origin)
{
	if (!stream || !stream->s_ops || !stream->s_ops->s_seek) {
		return FX_ERR_NOT_SUPPORTED;
	}

	return stream->s_ops->s_seek(stream->s_obj, offset, origin);
}

static enum fx_status stream_reserve(struct stream_data *stream, size_t len)
{
	if (!stream || !stream->s_ops || !stream->s_ops->s_reserve) {
		return FX_ERR_NOT_SUPPORTED;
	}

	return stream->s_ops->s_reserve(stream->s_obj, len);
}

static enum fx_status read_char_binary(struct stream_data *stream, fx_wchar *c)
{
	size_t r;
	unsigned char v = 0;
	enum fx_status status = stream->s_ops->s_read(stream->s_obj, &v, 1, &r);

	*c = v;

	if (status == FX_SUCCESS && r < 1) {
		status = FX_ERR_NO_DATA;
	}

	return status;
}

static enum fx_status read_char_utf8(struct stream_data *stream, fx_wchar *c)
{
	size_t r;
	unsigned char s[4];
	unsigned int len = 0;
	enum fx_status status = stream->s_ops->s_read(stream->s_obj, s, 1, &r);

	if (!FX_OK(status)) {
		return status;
	}

	if (r < 1) {
		return FX_ERR_NO_DATA;
	}

	len = fx_wchar_utf8_header_decode(s[0]);
	if (len <= 0 || len > 4) {
		return FX_ERR_BAD_FORMAT;
	}

	if (len == 1) {
		*c = s[0];
		return FX_SUCCESS;
	}

	status = stream->s_ops->s_read(stream->s_obj, s + 1, len - 1, &r);

	if (!FX_OK(status)) {
		return status;
	}

	if (r != len - 1) {
		return FX_ERR_BAD_FORMAT;
	}

	fx_wchar result = fx_wchar_utf8_codepoint_decode((char *)s);

	if (result == FX_WCHAR_INVALID) {
		return FX_ERR_BAD_FORMAT;
	}

	*c = result;
	return FX_SUCCESS;
}

static enum fx_status stream_read_char(struct stream_data *stream, fx_wchar *c)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_ERR_NOT_SUPPORTED;

#if 0
	if (stream->s_ops->s_getc) {
		return stream->s_ops->s_getc(stream->s_obj, c);
	}
#endif

	if (!stream->s_ops->s_read) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (stream->s_cfg->s_mode & FX_STREAM_BINARY) {
		return read_char_binary(stream, c);
	}

	return read_char_utf8(stream, c);
}

static enum fx_status __write_char(struct stream_data *stream, fx_wchar c)
{
	size_t w, len;
	enum fx_status status;
	char s[4];

	if (stream->s_cfg->s_mode & FX_STREAM_BINARY) {
		s[0] = c & 0xFF;
		len = 1;
	} else {
		len = fx_wchar_utf8_codepoint_encode(c, s);
		if (len == 0 || len > 4) {
			return FX_ERR_INVALID_ARGUMENT;
		}
	}

	status = stream->s_ops->s_write(stream->s_obj, (unsigned char *)s, len, &w);

	if (!FX_OK(status)) {
		return status;
	}

	if (status == FX_SUCCESS && w < len) {
		status = FX_ERR_IO_FAILURE;
	}

	return status;
}

static enum fx_status stream_write_char(struct stream_data *stream, fx_wchar c)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_WRITE)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_ERR_NOT_SUPPORTED;

	if (!stream->s_ops->s_write) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (c == '\n') {
		stream->s_private->s_add_indent = 1;
	}

	if (!stream->s_private->s_istack_size) {
		return __write_char(stream, c);
	}

	if (stream->s_private->s_add_indent && c != '\n') {
		int indent = current_indent(stream);
		for (int i = 0; i < indent; i++) {
			__write_char(stream, ' ');
			__write_char(stream, ' ');
		}

		stream->s_private->s_add_indent = 0;
	}

	__write_char(stream, c);

	if (c == '\n') {
		stream->s_private->s_add_indent = 1;
	}

	return FX_SUCCESS;
}

static enum fx_status stream_read_bytes(
	struct stream_data *stream, void *buf, size_t count, size_t *nr_read)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_ERR_NOT_SUPPORTED;

	if (!stream->s_ops->s_read) {
		return status;
	}

	return stream->s_ops->s_read(stream->s_obj, buf, count, nr_read);
}

static enum fx_status stream_read_line(struct stream_data *stream, char *s, size_t max)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_SUCCESS;

	size_t i = 0;
	fx_wchar c = 0;

	while (1) {
		if (i >= max) {
			break;
		}

		status = stream_read_char(stream, &c);
		if (status != FX_SUCCESS) {
			break;
		}

		if (c == '\n') {
			break;
		}

		s[i++] = c;
		s[i] = '\0';
	}

	return FX_SUCCESS;
}

static enum fx_status stream_read_line_s(
	struct stream_data *src, struct stream_data *dest)
{
	if (!(src->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (!(dest->s_cfg->s_mode & FX_STREAM_WRITE)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_SUCCESS;

	size_t i = 0;
	fx_wchar c = 0;

	while (1) {
		status = stream_read_char(src, &c);
		if (status != FX_SUCCESS) {
			break;
		}

		stream_write_char(dest, c);
		i++;

		if (c == '\n') {
			break;
		}
	}

	if (status == FX_ERR_NO_DATA && i > 0) {
		status = FX_SUCCESS;
	}

	return status;
}

static enum fx_status stream_read_line_to_bstr(
	struct stream_data *src, struct fx_bstr *dest)
{
	if (!(src->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_SUCCESS;

	size_t i = 0;
	fx_wchar c = 0;

	while (1) {
		status = stream_read_char(src, &c);
		if (status != FX_SUCCESS) {
			break;
		}

		fx_bstr_write_char(dest, c);
		i++;

		if (c == '\n') {
			break;
		}
	}

	if (status == FX_ERR_NO_DATA && i > 0) {
		status = FX_SUCCESS;
	}

	return status;
}

static enum fx_status stream_write_bytes(
	struct stream_data *stream, const void *buf, size_t count, size_t *nr_written)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_WRITE)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_ERR_NOT_SUPPORTED;

	if (!stream->s_ops->s_write) {
		return status;
	}

	return stream->s_ops->s_write(stream->s_obj, buf, count, nr_written);
}

static enum fx_status stream_read_all_bytes(
	struct stream_data *stream, void *p, size_t max, size_t *out_nr_read)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status = FX_SUCCESS;
	size_t nr_read = 0;
	unsigned char *s = p;

	while (nr_read < max) {
		int c;
		status = stream_read_char(stream, &c);
		if (status != FX_SUCCESS) {
			break;
		}

		s[nr_read++] = c;
	}

	if (status == FX_ERR_NO_DATA && nr_read > 0) {
		status = FX_SUCCESS;
	}

	*out_nr_read = nr_read;
	return status;
}

static enum fx_status stream_read_all_bytes_s(
	struct stream_data *src, struct stream_data *dest,
	struct fx_stream_buffer_p *buffer, size_t *out_nr_read)
{
	if (!(src->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (!(dest->s_cfg->s_mode & FX_STREAM_WRITE)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (!buffer) {
		return FX_ERR_INVALID_ARGUMENT;
	}

	if (src->s_ops->s_seek && dest->s_ops->s_reserve) {
		size_t offset = stream_cursor(src);
		stream_seek(src, 0, FX_STREAM_SEEK_END);
		size_t length = stream_cursor(src);
		stream_seek(src, offset, FX_STREAM_SEEK_START);

		stream_reserve(dest, length);
	}

	enum fx_status status = FX_SUCCESS;
	size_t nr_read = 0;

	while (1) {
		size_t r = 0, w = 0;
		status = stream_read_bytes(
			src, buffer->p_buf, buffer->p_buf_len, &r);
		if (status != FX_SUCCESS) {
			break;
		}

		status = stream_write_bytes(dest, buffer->p_buf, r, &w);
		nr_read += w;

		if (status != FX_SUCCESS || w != buffer->p_buf_len) {
			break;
		}
	}

	if (status == FX_ERR_NO_DATA && nr_read > 0) {
		status = FX_SUCCESS;
	}

	if (out_nr_read) {
		*out_nr_read = nr_read;
	}

	return status;
}

static enum fx_status stream_read_all_bytes_to_bstr_s(
	struct stream_data *src, struct fx_bstr *dest,
	struct fx_stream_buffer_p *buffer, size_t *out_nr_read)
{
	if (!(src->s_cfg->s_mode & FX_STREAM_READ)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (!buffer) {
		return FX_ERR_INVALID_ARGUMENT;
	}

	if (src->s_ops->s_seek) {
		size_t offset = stream_cursor(src);
		stream_seek(src, 0, FX_STREAM_SEEK_END);
		size_t length = stream_cursor(src);
		stream_seek(src, offset, FX_STREAM_SEEK_START);

		fx_bstr_reserve(dest, length);
	}

	enum fx_status status = FX_SUCCESS;
	size_t nr_read = 0;

	while (1) {
		size_t r = 0, w = 0;
		status = stream_read_bytes(
			src, buffer->p_buf, buffer->p_buf_len, &r);
		if (status != FX_SUCCESS) {
			break;
		}

		status = fx_bstr_write_chars(dest, buffer->p_buf, r, &w);
		nr_read += w;

		if (status != FX_SUCCESS || w != buffer->p_buf_len) {
			break;
		}
	}

	if (status == FX_ERR_NO_DATA && nr_read > 0) {
		status = FX_SUCCESS;
	}

	if (out_nr_read) {
		*out_nr_read = nr_read;
	}

	return status;
}

static enum fx_status stream_write_string(
	struct stream_data *stream, const char *s, size_t *nr_written)
{
	size_t i;
	enum fx_status status = FX_SUCCESS;

	for (i = 0; s[i]; i++) {
		status = stream_write_char(stream, s[i]);

		if (!FX_OK(status)) {
			break;
		}
	}

	if (nr_written) {
		*nr_written = i;
	}

	return status;
}

static fx_stream *init_stdio_stream(FILE *fp, fx_stream_mode mode)
{
	fx_stdio_stream *stream = fx_object_create(FX_TYPE_STDIO_STREAM);
	if (!stream) {
		return NULL;
	}

	struct fx_stdio_stream_p *p
		= fx_object_get_private(stream, FX_TYPE_STDIO_STREAM);
	fx_stream_cfg *cfg = fx_object_get_protected(stream, FX_TYPE_STREAM);
	p->s_fp = fp;
	cfg->s_mode = mode;

	return stream;
}

static enum fx_status stream_push_indent(struct stream_data *stream, int indent)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_WRITE)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (stream->s_cfg->s_mode & FX_STREAM_BINARY) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (!stream->s_private->s_istack) {
		stream->s_private->s_istack = calloc(4, sizeof(int));
		stream->s_private->s_istack_size = 4;
		stream->s_private->s_istack_ptr = 0;
	}

	if (stream->s_private->s_istack_ptr + 1 >= stream->s_private->s_istack_size) {
		int *buf = realloc(
			stream->s_private->s_istack,
			(stream->s_private->s_istack_size + 4) * sizeof(int));
		if (!buf) {
			return FX_ERR_NO_MEMORY;
		}

		stream->s_private->s_istack = buf;
		stream->s_private->s_istack_size += 4;
	}

	int cur_indent
		= stream->s_private->s_istack[stream->s_private->s_istack_ptr];
	stream->s_private->s_istack[++stream->s_private->s_istack_ptr]
		= cur_indent + indent;

	return FX_SUCCESS;
}

static enum fx_status stream_pop_indent(struct stream_data *stream)
{
	if (!(stream->s_cfg->s_mode & FX_STREAM_WRITE)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (stream->s_cfg->s_mode & FX_STREAM_BINARY) {
		return FX_ERR_NOT_SUPPORTED;
	}

	if (!stream->s_private->s_istack || !stream->s_private->s_istack_size
	    || !stream->s_private->s_istack_ptr) {
		return FX_SUCCESS;
	}

	stream->s_private->s_istack_ptr--;
	return FX_SUCCESS;
}

static void fctprintf_callback(char c, void *p)
{
	struct stream_data *stream = p;
	stream_write_char(stream, c);
}

/*** PUBLIC FUNCTIONS *********************************************************/

fx_stream *z__fx_stream_get_stdin(void)
{
	if (!stdio[IDX_STDIN]) {
		stdio[IDX_STDIN] = init_stdio_stream(stdin, FX_STREAM_READ);
	}

	return stdio[IDX_STDIN];
}

fx_stream *z__fx_stream_get_stdout(void)
{
	if (!stdio[IDX_STDOUT]) {
		stdio[IDX_STDOUT] = init_stdio_stream(stdout, FX_STREAM_WRITE);
	}

	return stdio[IDX_STDOUT];
}

fx_stream *z__fx_stream_get_stderr(void)
{
	if (!stdio[IDX_STDERR]) {
		stdio[IDX_STDERR] = init_stdio_stream(stderr, FX_STREAM_WRITE);
	}

	return stdio[IDX_STDERR];
}

fx_stream_buffer *fx_stream_buffer_create_dynamic(size_t buffer_size)
{
	fx_stream_buffer *buffer = fx_object_create(FX_TYPE_STREAM_BUFFER);
	if (!buffer) {
		return NULL;
	}

	struct fx_stream_buffer_p *p
		= fx_object_get_private(buffer, FX_TYPE_STREAM_BUFFER);

	p->p_buf = malloc(buffer_size);
	if (!p->p_buf) {
		fx_stream_buffer_unref(buffer);
		return NULL;
	}

	p->p_buf_len = buffer_size;
	p->p_flags = FX_STREAM_BUFFER_F_DYNAMIC;

	return buffer;
}

fx_stream_buffer *fx_stream_buffer_create(void *buf, size_t len)
{
	fx_stream_buffer *buffer = fx_object_create(FX_TYPE_STREAM_BUFFER);
	if (!buffer) {
		return NULL;
	}

	struct fx_stream_buffer_p *p
		= fx_object_get_private(buffer, FX_TYPE_STREAM_BUFFER);

	p->p_buf = buf;
	p->p_buf_len = len;
	p->p_flags = 0;

	return buffer;
}

fx_stream *fx_stream_open_fp(FILE *fp)
{
	return init_stdio_stream(fp, FX_STREAM_READ | FX_STREAM_WRITE);
}

enum fx_status fx_stream_reserve(fx_stream *stream, size_t len)
{
	if (IS_BSTR(stream)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	FX_CLASS_DISPATCH_VIRTUAL(
		fx_stream, FX_TYPE_STREAM, FX_ERR_NOT_SUPPORTED, s_reserve, stream,
		len);
}

enum fx_status fx_stream_seek(
	fx_stream *stream, long long offset, fx_stream_seek_origin origin)
{
	if (IS_BSTR(stream)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	FX_CLASS_DISPATCH_VIRTUAL(
		fx_stream, FX_TYPE_STREAM, FX_ERR_NOT_SUPPORTED, s_seek, stream,
		offset, origin);
}

size_t fx_stream_cursor(const fx_stream *stream)
{
	if (IS_BSTR(stream)) {
		return fx_bstr_get_size((fx_bstr *)stream);
	}

	STREAM_DISPATCH_VIRTUAL_0(stream_cursor, stream);
}

enum fx_status fx_stream_push_indent(fx_stream *strp, int indent)
{
	if (IS_BSTR(strp)) {
		return fx_bstr_push_indent((fx_bstr *)strp, indent);
	}

	STREAM_DISPATCH_VIRTUAL(stream_push_indent, strp, indent);
}

enum fx_status fx_stream_pop_indent(fx_stream *strp)
{
	if (IS_BSTR(strp)) {
		return fx_bstr_pop_indent((fx_bstr *)strp);
	}

	STREAM_DISPATCH_VIRTUAL_0(stream_pop_indent, strp);
}

enum fx_status fx_stream_read_char(fx_stream *strp, int *c)
{
	if (IS_BSTR(strp)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	STREAM_DISPATCH_VIRTUAL(stream_read_char, strp, c);
}

enum fx_status fx_stream_read_bytes(
	fx_stream *strp, void *buf, size_t count, size_t *nr_read)
{
	if (IS_BSTR(strp)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	STREAM_DISPATCH_VIRTUAL(stream_read_bytes, strp, buf, count, nr_read);
}

enum fx_status fx_stream_read_line(fx_stream *strp, char *s, size_t max)
{
	if (IS_BSTR(strp)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	STREAM_DISPATCH_VIRTUAL(stream_read_line, strp, s, max);
}

enum fx_status fx_stream_read_line_s(fx_stream *src, fx_stream *dest)
{
	if (IS_BSTR(src)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status;
	struct stream_data src_p, dest_p;

	status = stream_get_data(src, &src_p);
	if (!FX_OK(status)) {
		return status;
	}

	if (IS_BSTR(dest)) {
		return stream_read_line_to_bstr(&src_p, (fx_bstr *)dest);
	}

	status = stream_get_data(dest, &dest_p);
	if (!FX_OK(status)) {
		return status;
	}

	return stream_read_line_s(&src_p, &dest_p);
}

enum fx_status fx_stream_read_all_bytes(
	fx_stream *stream, void *p, size_t max, size_t *out_nr_read)
{
	if (IS_BSTR(stream)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	STREAM_DISPATCH_VIRTUAL(stream_read_all_bytes, stream, p, max, out_nr_read);
}

enum fx_status fx_stream_read_all_bytes_s(
	fx_stream *src, fx_stream *dest, fx_stream_buffer *buffer, size_t *out_nr_read)
{
	if (IS_BSTR(src)) {
		return FX_ERR_NOT_SUPPORTED;
	}

	enum fx_status status;
	struct stream_data src_p, dest_p;
	struct fx_stream_buffer_p *buffer_p;

	status = stream_get_data(src, &src_p);
	if (!FX_OK(status)) {
		return status;
	}

	buffer_p = fx_object_get_private(buffer, FX_TYPE_STREAM_BUFFER);
	if (!buffer_p) {
		return FX_ERR_INVALID_ARGUMENT;
	}

	if (IS_BSTR(dest)) {
		return stream_read_all_bytes_to_bstr_s(
			&src_p, (fx_bstr *)dest, buffer_p, out_nr_read);
	}

	status = stream_get_data(dest, &dest_p);
	if (!FX_OK(status)) {
		return status;
	}

	return stream_read_all_bytes_s(&src_p, &dest_p, buffer_p, out_nr_read);
}

enum fx_status fx_stream_write_char(fx_stream *stream, fx_wchar c)
{
	if (IS_BSTR(stream)) {
		return fx_bstr_write_char((fx_bstr *)stream, c);
	}

	STREAM_DISPATCH_VIRTUAL(stream_write_char, stream, c);
}

enum fx_status fx_stream_write_string(
	fx_stream *stream, const char *s, size_t *nr_written)
{
	if (IS_BSTR(stream)) {
		return fx_bstr_write_cstr((fx_bstr *)stream, s, nr_written);
	}

	STREAM_DISPATCH_VIRTUAL(stream_write_string, stream, s, nr_written);
}

enum fx_status fx_stream_write_bytes(
	fx_stream *stream, const void *buf, size_t count, size_t *nr_written)
{
	if (IS_BSTR(stream)) {
		return fx_bstr_write_chars((fx_bstr *)stream, buf, count, nr_written);
	}

	STREAM_DISPATCH_VIRTUAL(stream_write_bytes, stream, buf, count, nr_written);
}

enum fx_status fx_stream_write_fmt(
	fx_stream *stream, size_t *nr_written, const char *format, ...)
{
	if (IS_BSTR(stream)) {
		va_list arg;
		va_start(arg, format);
		fx_status w = fx_bstr_write_vfmt(
			(fx_bstr *)stream, nr_written, format, arg);
		va_end(arg);

		return w;
	}

	struct stream_data p;
	enum fx_status status = stream_get_data(stream, &p);

	va_list arg;
	va_start(arg, format);
	int w = z__fx_fctprintf(fctprintf_callback, &p, format, arg);
	va_end(arg);

	if (nr_written) {
		*nr_written = w;
	}

	return FX_SUCCESS;
}

enum fx_status fx_stream_write_vfmt(
	fx_stream *stream, size_t *nr_written, const char *format, va_list arg)
{
	if (IS_BSTR(stream)) {
		return fx_bstr_write_vfmt((fx_bstr *)stream, nr_written, format, arg);
	}

	struct stream_data p;
	enum fx_status status = stream_get_data(stream, &p);

	int w = z__fx_fctprintf(fctprintf_callback, &p, format, arg);

	if (nr_written) {
		*nr_written = w;
	}

	return FX_SUCCESS;
}

/*** VIRTUAL FUNCTIONS ********************************************************/

static void stream_init(fx_object *obj, void *priv)
{
	struct fx_stream_p *stream = priv;
}

static void stream_fini(fx_object *obj, void *priv)
{
	struct fx_stream_p *stream = priv;
	fx_stream_class *ops = fx_object_get_interface(obj, FX_TYPE_STREAM);

	if (stream->s_istack) {
		free(stream->s_istack);
	}

	if (ops->s_close) {
		ops->s_close(obj);
	}
}

static void stream_buffer_init(fx_object *obj, void *priv)
{
	struct fx_stream_buffer_p *buffer = priv;
}

static void stream_buffer_fini(fx_object *obj, void *priv)
{
	struct fx_stream_buffer_p *buffer = priv;
	if (buffer->p_flags & FX_STREAM_BUFFER_F_DYNAMIC) {
		free(buffer->p_buf);
	}
}

static void stdio_stream_init(fx_object *obj, void *priv)
{
	struct fx_stdio_stream_p *stream = priv;
}

static void stdio_stream_fini(fx_object *obj, void *priv)
{
	struct fx_stdio_stream_p *stream = priv;
}

static enum fx_status stdio_read(
	fx_stream *stream, void *out, size_t max, size_t *nr_read)
{
	struct fx_stdio_stream_p *p
		= fx_object_get_private(stream, FX_TYPE_STDIO_STREAM);

	enum fx_status status = FX_SUCCESS;

	size_t count = fread(out, 1, max, p->s_fp);

	if (ferror(p->s_fp)) {
		status = FX_ERR_IO_FAILURE;
	}

	*nr_read = count;
	return status;
}

static enum fx_status stdio_write(
	fx_stream *stream, const void *data, size_t count, size_t *nr_written)
{
	struct fx_stdio_stream_p *p
		= fx_object_get_private(stream, FX_TYPE_STDIO_STREAM);

	enum fx_status status = FX_SUCCESS;
	size_t w = fwrite(data, 1, count, p->s_fp);

	if (ferror(p->s_fp)) {
		status = FX_ERR_IO_FAILURE;
	}

	*nr_written = w;
	return status;
}

static enum fx_status stdio_seek(
	fx_stream *stream, long long offset, fx_stream_seek_origin origin)
{
	struct fx_stdio_stream_p *p
		= fx_object_get_private(stream, FX_TYPE_STDIO_STREAM);

	int whence = 0;
	switch (origin) {
	case FX_STREAM_SEEK_START:
		whence = SEEK_SET;
		break;
	case FX_STREAM_SEEK_CURRENT:
		whence = SEEK_CUR;
		break;
	case FX_STREAM_SEEK_END:
		whence = SEEK_END;
		break;
	default:
		return FX_ERR_INVALID_ARGUMENT;
	}

	int ret = fseek(p->s_fp, offset, whence);
	if (ret != 0) {
		return FX_ERR_NOT_SUPPORTED;
	}

	return FX_SUCCESS;
}

static enum fx_status stdio_tell(const fx_stream *stream, size_t *cursor)
{
	struct fx_stdio_stream_p *p
		= fx_object_get_private(stream, FX_TYPE_STDIO_STREAM);

	long pos = ftell(p->s_fp);
	if (pos == -1L) {
		return FX_ERR_NOT_SUPPORTED;
	}

	*cursor = (size_t)pos;
	return FX_SUCCESS;
}

/*** CLASS DEFINITION *********************************************************/

// ---- fx_stream DEFINITION
FX_TYPE_CLASS_DEFINITION_BEGIN(fx_stream)
	FX_TYPE_CLASS_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
		FX_INTERFACE_ENTRY(to_string) = NULL;
	FX_TYPE_CLASS_INTERFACE_END(fx_object, FX_TYPE_OBJECT)
FX_TYPE_CLASS_DEFINITION_END(fx_stream)

FX_TYPE_DEFINITION_BEGIN(fx_stream)
	FX_TYPE_ID(0xa2c98988, 0x30e5, 0x47c7, 0x88cd, 0x6c8ea79f69cd);
	FX_TYPE_CLASS(fx_stream_class);
	FX_TYPE_INSTANCE_PRIVATE(struct fx_stream_p);
	FX_TYPE_INSTANCE_PROTECTED(fx_stream_cfg);
	FX_TYPE_INSTANCE_INIT(stream_init);
	FX_TYPE_INSTANCE_FINI(stream_fini);
FX_TYPE_DEFINITION_END(fx_stream)

// ---- fx_stream_buffer DEFINITION
FX_TYPE_CLASS_DEFINITION_BEGIN(fx_stream_buffer)
	FX_TYPE_CLASS_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
		FX_INTERFACE_ENTRY(to_string) = NULL;
	FX_TYPE_CLASS_INTERFACE_END(fx_object, FX_TYPE_OBJECT)
FX_TYPE_CLASS_DEFINITION_END(fx_stream_buffer)

FX_TYPE_DEFINITION_BEGIN(fx_stream_buffer)
	FX_TYPE_ID(0x575c7be1, 0x665f, 0x41f8, 0xbfed, 0x6269a2985be0);
	FX_TYPE_CLASS(fx_stream_buffer_class);
	FX_TYPE_INSTANCE_PRIVATE(struct fx_stream_buffer_p);
	FX_TYPE_INSTANCE_INIT(stream_buffer_init);
	FX_TYPE_INSTANCE_FINI(stream_buffer_fini);
FX_TYPE_DEFINITION_END(fx_stream_buffer)

// ---- fx_stdio_stream DEFINITION
FX_TYPE_CLASS_DEFINITION_BEGIN(fx_stdio_stream)
	FX_TYPE_CLASS_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
		FX_INTERFACE_ENTRY(to_string) = NULL;
	FX_TYPE_CLASS_INTERFACE_END(fx_object, FX_TYPE_OBJECT)

	FX_TYPE_CLASS_INTERFACE_BEGIN(fx_stream, FX_TYPE_STREAM)
		FX_INTERFACE_ENTRY(s_close) = NULL;
		FX_INTERFACE_ENTRY(s_seek) = stdio_seek;
		FX_INTERFACE_ENTRY(s_tell) = stdio_tell;
		FX_INTERFACE_ENTRY(s_getc) = NULL;
		FX_INTERFACE_ENTRY(s_read) = stdio_read;
		FX_INTERFACE_ENTRY(s_write) = stdio_write;
		FX_INTERFACE_ENTRY(s_reserve) = NULL;
	FX_TYPE_CLASS_INTERFACE_END(fx_stream, FX_TYPE_STREAM)
FX_TYPE_CLASS_DEFINITION_END(fx_stdio_stream)

FX_TYPE_DEFINITION_BEGIN(fx_stdio_stream)
	FX_TYPE_ID(0x67678926, 0xd0b7, 0x4f99, 0xb83c, 0x790927597645);
	FX_TYPE_EXTENDS(FX_TYPE_STREAM);
	FX_TYPE_CLASS(fx_stdio_stream_class);
	FX_TYPE_INSTANCE_PRIVATE(struct fx_stdio_stream_p);
	FX_TYPE_INSTANCE_INIT(stdio_stream_init);
	FX_TYPE_INSTANCE_FINI(stdio_stream_fini);
FX_TYPE_DEFINITION_END(fx_stdio_stream)