/**
 * See Copyright Notice in picrin.h
 */

#include "picrin.h"
#include "picrin/extra.h"

#if PIC_USE_PORT

enum {
  FILE_READ   = 01,
  FILE_WRITE  = 02,
  FILE_UNBUF  = 04,
  FILE_EOF    = 010,
  FILE_ERR    = 020,
  FILE_LNBUF  = 040,
  FILE_SETBUF = 0100
};

struct port {
  /* buffer */
  char buf[1];                  /* fallback buffer */
  long cnt;                     /* characters left */
  char *ptr;                    /* next character position */
  char *base;                   /* location of the buffer */
  /* operators */
  void *cookie;
  const pic_port_type *vtable;
  int flag;                     /* mode of the file access */
};

#define VALID_RANGE(pic, len, s, e) do {                                \
    if (s < 0 || len < s)                                               \
      pic_error(pic, "invalid start index", 1, pic_int_value(pic, s));  \
    if (e < s || len < e)                                               \
      pic_error(pic, "invalid end index", 1, pic_int_value(pic, e));    \
  } while (0)

static int flushbuf(pic_state *, int, struct port *);

static void
port_dtor(pic_state *pic, void *port)
{
  struct port *fp = port;
  if (fp->flag == 0)
    return;
  if ((fp->flag & FILE_WRITE) != 0 && fp->base != NULL)
    flushbuf(pic, EOF, fp);
  if (fp->base != fp->buf && (fp->flag & FILE_SETBUF) == 0)
    pic_free(pic, fp->base);
  fp->vtable->close(pic, fp->cookie);
  pic_free(pic, port);
}

static const pic_data_type port_type = { "port", port_dtor };

pic_value
pic_funopen(pic_state *pic, void *cookie, const pic_port_type *type)
{
  struct port *port;

  port = pic_malloc(pic, sizeof(*port));
  port->cnt = 0;
  port->base = NULL;
  port->flag = type->read ? FILE_READ : FILE_WRITE;
  port->cookie = cookie;
  port->vtable = type;

  return pic_data_value(pic, port, &port_type);
}

int
pic_fclose(pic_state *pic, pic_value port)
{
  struct port *fp = pic_data(pic, port);
  int r;

  if (fp->flag == 0)            /* already closed */
    return 0;
  pic_fflush(pic, port);
  if (fp->base != fp->buf && (fp->flag & FILE_SETBUF) == 0)
    pic_free(pic, fp->base);
  if ((r = fp->vtable->close(pic, fp->cookie)) < 0)
    return r;
  fp->flag = 0;
  return r;
}

void
pic_clearerr(pic_state *pic, pic_value port)
{
  struct port *fp = pic_data(pic, port);

  fp->flag &= ~(FILE_EOF | FILE_ERR);
}

int
pic_feof(pic_state *pic, pic_value port)
{
  struct port *fp = pic_data(pic, port);

  return (fp->flag & FILE_EOF) != 0;
}

int
pic_ferror(pic_state *pic, pic_value port)
{
  struct port *fp = pic_data(pic, port);

  return (fp->flag & FILE_ERR) != 0;
}

int
pic_setvbuf(pic_state *pic, pic_value port, char *buf, int mode, size_t size)
{
  struct port *fp = pic_data(pic, port);

  fp->flag &= ~(FILE_UNBUF | FILE_LNBUF);
  if (mode == PIC_IOLBF) {
    fp->flag |= FILE_LNBUF;
  } else if (mode == PIC_IONBF) {
    fp->flag |= FILE_UNBUF;
  }

  if (buf == NULL) {
    return 0;
  }
  if (size < PIC_BUFSIZ) {
    return EOF;
  }
  fp->base = buf;
  fp->flag |= FILE_SETBUF;
  return 0;
}

static int
fillbuf(pic_state *pic, struct port *fp)
{
  int bufsize;

  if ((fp->flag & (FILE_READ|FILE_EOF|FILE_ERR)) != FILE_READ)
    return EOF;
  if (fp->base == NULL) {
    if ((fp->flag & FILE_UNBUF) == 0) {
      /* no buffer yet */
      if ((fp->base = pic_malloc(pic, PIC_BUFSIZ)) == NULL) {
        /* can't get buffer, try unbuffered */
        fp->flag |= FILE_UNBUF;
      }
    }
    if (fp->flag & FILE_UNBUF) {
      fp->base = fp->buf;
    }
  }
  bufsize = (fp->flag & FILE_UNBUF) ? sizeof(fp->buf) : PIC_BUFSIZ;

  fp->ptr = fp->base;
  fp->cnt = fp->vtable->read(pic, fp->cookie, fp->ptr, bufsize);

  if (--fp->cnt < 0) {
    if (fp->cnt == -1)
      fp->flag |= FILE_EOF;
    else
      fp->flag |= FILE_ERR;
    fp->cnt = 0;
    return EOF;
  }

  return (unsigned char) *fp->ptr++;
}

static int
flushbuf(pic_state *pic, int x, struct port *fp)
{
  int num_written=0, bufsize=0;
  char c = x;

  if ((fp->flag & (FILE_WRITE|FILE_EOF|FILE_ERR)) != FILE_WRITE)
    return EOF;
  if (fp->base == NULL && ((fp->flag & FILE_UNBUF) == 0)) {
    /* no buffer yet */
    if ((fp->base = pic_malloc(pic, PIC_BUFSIZ)) == NULL) {
      /* couldn't allocate a buffer, so try unbuffered */
      fp->flag |= FILE_UNBUF;
    } else {
      fp->ptr = fp->base;
      fp->cnt = PIC_BUFSIZ - 1;
    }
  }
  if (fp->flag & FILE_UNBUF) {
    /* unbuffered write */
    fp->ptr = fp->base = NULL;
    fp->cnt = 0;
    if (x == EOF)
      return EOF;
    num_written = fp->vtable->write(pic, fp->cookie, (const char *) &c, 1);
    bufsize = 1;
  } else {
    /* buffered write */
    assert(fp->ptr);
    if (x != EOF) {
      *fp->ptr++ = (unsigned char) c;
    }
    bufsize = (int)(fp->ptr - fp->base);
    while(bufsize - num_written > 0) {
      int t;
      t = fp->vtable->write(pic, fp->cookie, fp->base + num_written, bufsize - num_written);
      if (t < 0)
        break;
      num_written += t;
    }

    fp->ptr = fp->base;
    fp->cnt = PIC_BUFSIZ - 1;
  }

  if (num_written == bufsize) {
    return x;
  } else {
    fp->flag |= FILE_ERR;
    return EOF;
  }
}

int
pic_fflush(pic_state *pic, pic_value port)
{
  struct port *fp = pic_data(pic, port);
  int retval;

  retval = 0;
  if ((fp->flag & FILE_WRITE) == 0)
    return -1;
  flushbuf(pic, EOF, fp);
  if (fp->flag & FILE_ERR)
    retval = -1;
  return retval;
}

#define getc_(pic, p)                           \
  ((--(p)->cnt >= 0)                            \
   ? (unsigned char) *(p)->ptr++                \
   : fillbuf((pic), p))
#define putc_(pic, x, p)                                                \
  ((--(p)->cnt >= 0 && !(((p)->flag & FILE_LNBUF) && (x) == '\n'))      \
   ? *(p)->ptr++ = (x)                                                  \
   : flushbuf((pic), (x), (p)))

int
pic_fputc(pic_state *pic, int x, pic_value port)
{
  struct port *fp = pic_data(pic, port);

  return putc_(pic, x, fp);
}

int
pic_fgetc(pic_state *pic, pic_value port)
{
  struct port *fp = pic_data(pic, port);

  return getc_(pic, fp);
}

int
pic_fputs(pic_state *pic, const char *s, pic_value port)
{
  struct port *fp = pic_data(pic, port);

  const char *ptr = s;
  while(*ptr != '\0') {
    if (putc_(pic, *ptr, fp) == EOF)
      return EOF;
    ++ptr;
  }
  return (int)(ptr - s);
}

char *
pic_fgets(pic_state *pic, char *s, int size, pic_value port)
{
  struct port *fp = pic_data(pic, port);
  int c = 0;
  char *buf;

  pic_fflush(pic, port);

  if (size == 0) {
    return NULL;
  }
  buf = s;
  while (--size > 0 && (c = getc_(pic, fp)) != EOF) {
    if ((*buf++ = c) == '\n')
      break;
  }
  *buf = '\0';

  return (c == EOF && buf == s) ? NULL : s;
}

int
pic_ungetc(pic_state *pic, int c, pic_value port)
{
  struct port *fp = pic_data(pic, port);
  unsigned char uc = c;

  if (c == EOF || fp->base == fp->ptr) {
    return EOF;
  }
  fp->cnt++;
  return *--fp->ptr = uc;
}

size_t
pic_fread(pic_state *pic, void *ptr, size_t size, size_t count, pic_value port)
{
  struct port *fp = pic_data(pic, port);
  char *bptr = ptr;
  long nbytes;
  int c;

  nbytes = size * count;
  while (nbytes > fp->cnt) {
    memcpy(bptr, fp->ptr, fp->cnt);
    fp->ptr += fp->cnt;
    bptr += fp->cnt;
    nbytes -= fp->cnt;
    if ((c = fillbuf(pic, fp)) == EOF) {
      return (size * count - nbytes) / size;
    } else {
      pic_ungetc(pic, c, port);
    }
  }
  memcpy(bptr, fp->ptr, nbytes);
  fp->ptr += nbytes;
  fp->cnt -= nbytes;
  return count;
}

size_t
pic_fwrite(pic_state *pic, const void *ptr, size_t size, size_t count, pic_value port)
{
  struct port *fp = pic_data(pic, port);
  const char *bptr = ptr;
  long nbytes;

  nbytes = size * count;
  while (nbytes > fp->cnt) {
    memcpy(fp->ptr, bptr, fp->cnt);
    fp->ptr += fp->cnt;
    bptr += fp->cnt;
    nbytes -= fp->cnt;
    if (flushbuf(pic, EOF, fp) == EOF) {
      return (size * count - nbytes) / size;
    }
  }
  memcpy(fp->ptr, bptr, nbytes);
  fp->ptr += nbytes;
  fp->cnt -= nbytes;
  return count;
}

long
pic_fseek(pic_state *pic, pic_value port, long offset, int whence)
{
  struct port *fp = pic_data(pic, port);
  long s;

  pic_fflush(pic, port);

  fp->ptr = fp->base;
  fp->cnt = 0;

  if ((s = fp->vtable->seek(pic, fp->cookie, offset, whence)) != 0)
    return s;
  fp->flag &= ~FILE_EOF;
  return 0;
}

int
pic_vfprintf(pic_state *pic, pic_value port, const char *fmt, va_list ap)
{
  return pic_fputs(pic, pic_cstr(pic, pic_vstrf_value(pic, fmt, ap), NULL), port);
}

int
pic_fprintf(pic_state *pic, pic_value port, const char *fmt, ...)
{
  va_list ap;
  int n;

  va_start(ap, fmt);
  n = pic_vfprintf(pic, port, fmt, ap);
  va_end(ap);
  return n;
}

int
pic_printf(pic_state *pic, const char *fmt, ...)
{
  va_list ap;
  int n;

  va_start(ap, fmt);
  n = pic_vfprintf(pic, pic_stdout(pic), fmt, ap);
  va_end(ap);
  return n;
}

typedef struct { char *buf; long pos, end, capa; } xbuf_t;

static int
string_read(pic_state *PIC_UNUSED(pic), void *cookie, char *ptr, int size)
{
  xbuf_t *m = cookie;

  if (size > (int)(m->end - m->pos))
    size = (int)(m->end - m->pos);
  memcpy(ptr, m->buf + m->pos, size);
  m->pos += size;
  return size;
}

static int
string_write(pic_state *pic, void *cookie, const char *ptr, int size)
{
  xbuf_t *m = cookie;

  if (m->pos + size >= m->capa) {
    m->capa = (m->pos + size) * 2;
    m->buf = pic_realloc(pic, m->buf, m->capa);
  }
  memcpy(m->buf + m->pos, ptr, size);
  m->pos += size;
  if (m->end < m->pos)
    m->end = m->pos;
  return size;
}

static long
string_seek(pic_state *PIC_UNUSED(pic), void *cookie, long pos, int whence)
{
  xbuf_t *m = cookie;

  switch (whence) {
  case PIC_SEEK_SET:
    m->pos = pos;
    break;
  case PIC_SEEK_CUR:
    m->pos += pos;
    break;
  case PIC_SEEK_END:
    m->pos = m->end + pos;
    break;
  }

  return m->pos;
}

static int
string_close(pic_state *pic, void *cookie)
{
  xbuf_t *m = cookie;

  pic_free(pic, m->buf);
  pic_free(pic, m);
  return 0;
}

static pic_value
pic_fmemopen(pic_state *pic, const char *data, int size, const char *mode)
{
  static const pic_port_type string_rd = { string_read, 0, string_seek, string_close };
  static const pic_port_type string_wr = { 0, string_write, string_seek, string_close };
  xbuf_t *m;

  m = pic_malloc(pic, sizeof(xbuf_t));
  m->buf = pic_malloc(pic, size);
  m->pos = 0;
  m->end = size;
  m->capa = size;

  if (*mode == 'r') {
    memcpy(m->buf, data, size);
    return pic_funopen(pic, m, &string_rd);
  } else {
    return pic_funopen(pic, m, &string_wr);
  }
}

static int
pic_fgetbuf(pic_state *pic, pic_value port, const char **buf, int *len)
{
  struct port *fp = pic_data(pic, port);
  xbuf_t *s;

  pic_fflush(pic, port);

  if (fp->vtable->write != string_write) {
    return -1;
  }
  s = fp->cookie;
  *len = s->end;
  *buf = s->buf;
  return 0;
}

bool
pic_port_p(pic_state *pic, pic_value obj, const pic_port_type *type)
{
  struct port *port;

  if (! pic_data_p(pic, obj, &port_type)) {
    return false;
  }
  port = pic_data(pic, obj);
  return type == NULL || port->vtable == type;
}

static pic_value
pic_port_input_port_p(pic_state *pic)
{
  pic_value v;

  pic_get_args(pic, "o", &v);

  if (pic_port_p(pic, v, NULL)) {
    struct port *port = pic_data(pic, v);
    return pic_bool_value(pic, (port->flag & FILE_READ) != 0);
  } else {
    return pic_false_value(pic);
  }
}

static pic_value
pic_port_output_port_p(pic_state *pic)
{
  pic_value v;

  pic_get_args(pic, "o", &v);

  if (pic_port_p(pic, v, NULL)) {
    struct port *port = pic_data(pic, v);
    return pic_bool_value(pic, (port->flag & FILE_WRITE) != 0);
  } else {
    return pic_false_value(pic);
  }
}

static pic_value
pic_port_port_p(pic_state *pic)
{
  pic_value v;

  pic_get_args(pic, "o", &v);

  return pic_bool_value(pic, pic_port_p(pic, v, NULL));
}

static pic_value
pic_port_eof_object_p(pic_state *pic)
{
  pic_value v;

  pic_get_args(pic, "o", &v);

  return pic_bool_value(pic, pic_eof_p(pic, v));
}

static pic_value
pic_port_eof_object(pic_state *pic)
{
  pic_get_args(pic, "");

  return pic_eof_object(pic);
}

static pic_value
pic_port_port_open_p(pic_state *pic)
{
  struct port *port;

  pic_get_args(pic, "u", &port, &port_type);

  return pic_bool_value(pic, port->flag != 0);
}

static pic_value
pic_port_close_port(pic_state *pic)
{
  void *isport;
  pic_value port;

  pic_get_args(pic, "u+", &isport, &port_type, &port);

  pic_fclose(pic, port);

  return pic_undef_value(pic);
}

static void
check_port_type(pic_state *pic, pic_value obj, int flags)
{
  struct port *port;
  if (! pic_data_p(pic, obj, &port_type)) {
    pic_error(pic, "port required", 0);
  }
  port = pic_data(pic, obj);
  if (port->flag == 0) {
    pic_error(pic, "open port required", 0);
  }
  if ((port->flag & flags) != flags) {
    switch (flags) {
    case FILE_WRITE:
      pic_error(pic, "output port required", 0);
    case FILE_READ:
      pic_error(pic, "input port required", 0);
    }
  }
}

static pic_value
pic_port_open_input_bytevector(pic_state *pic)
{
  unsigned char *buf;
  int len;

  pic_get_args(pic, "b", &buf, &len);

  return pic_fmemopen(pic, (char *)buf, len, "r");
}

static pic_value
pic_port_open_output_bytevector(pic_state *pic)
{
  pic_get_args(pic, "");

  return pic_fmemopen(pic, NULL, 0, "w");
}

static pic_value
pic_port_get_output_bytevector(pic_state *pic)
{
  pic_value port = pic_stdout(pic);
  const char *buf;
  int len;

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_WRITE);

  if (pic_fgetbuf(pic, port, &buf, &len) < 0) {
    pic_error(pic, "port was not created by open-output-bytevector", 0);
  }
  return pic_blob_value(pic, (unsigned char *)buf, len);
}

static pic_value
pic_port_open_input_string(pic_state *pic)
{
  pic_value str;
  const char *buf;
  int len;

  pic_get_args(pic, "s", &str);

  buf = pic_str(pic, str, &len);

  return pic_fmemopen(pic, buf, len, "r");
}

static pic_value
pic_port_open_output_string(pic_state *pic)
{
  pic_get_args(pic, "");

  return pic_fmemopen(pic, NULL, 0, "w");
}

static pic_value
pic_port_get_output_string(pic_state *pic)
{
  pic_value port = pic_stdout(pic);
  const char *buf;
  int len;

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_WRITE);

  if (pic_fgetbuf(pic, port, &buf, &len) < 0) {
    pic_error(pic, "port was not created by open-output-string", 0);
  }
  return pic_str_value(pic, buf, len);
}

static pic_value
pic_port_read_u8(pic_state *pic)
{
  pic_value port = pic_stdin(pic);
  int c;

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_READ);

  if ((c = pic_fgetc(pic, port)) == EOF) {
    return pic_eof_object(pic);
  }
  return pic_int_value(pic, c);
}

static pic_value
pic_port_peek_u8(pic_state *pic)
{
  int c;
  pic_value port = pic_stdin(pic);

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_READ);

  c = pic_fgetc(pic, port);
  if (c == EOF) {
    return pic_eof_object(pic);
  }
  pic_ungetc(pic, c, port);
  return pic_int_value(pic, c);
}

static pic_value
pic_port_read_char(pic_state *pic)
{
  pic_value port = pic_stdin(pic);
  int c;

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_READ);

  if ((c = pic_fgetc(pic, port)) == EOF) {
    return pic_eof_object(pic);
  }
  return pic_char_value(pic, c);
}

static pic_value
pic_port_peek_char(pic_state *pic)
{
  int c;
  pic_value port = pic_stdin(pic);

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_READ);

  c = pic_fgetc(pic, port);
  if (c == EOF) {
    return pic_eof_object(pic);
  }
  pic_ungetc(pic, c, port);
  return pic_char_value(pic, c);
}

static pic_value
pic_port_read_bytevector_ip(pic_state *pic)
{
  pic_value port;
  unsigned char *buf;
  int n, start, end, i, len;

  n = pic_get_args(pic, "b|oii", &buf, &len, &port, &start, &end);

  switch (n) {
  case 1:
    port = pic_stdin(pic);
  case 2:
    start = 0;
  case 3:
    end = len;
  }

  VALID_RANGE(pic, len, start, end);

  check_port_type(pic, port, FILE_READ);

  i = pic_fread(pic, buf + start, 1, end - start, port);
  if (i == 0) {
    return pic_eof_object(pic);
  }
  return pic_int_value(pic, i);
}

static pic_value
pic_port_read_bytevector(pic_state *pic)
{
  pic_value port = pic_stdin(pic), blob;
  int n, k, i;
  unsigned char *buf;

  n = pic_get_args(pic, "i|o", &k, &port);

  check_port_type(pic, port, FILE_READ);

  buf = pic_malloc(pic, k);

  i = pic_fread(pic, buf, 1, k, port);
  if (i == 0) {
    pic_free(pic, buf);
    return pic_eof_object(pic);
  }
  blob = pic_blob_value(pic, buf, i);
  pic_free(pic, buf);
  return blob;
}

static pic_value
pic_port_read_string(pic_state *pic)
{
  pic_value port = pic_stdin(pic), blob;
  int n, k, i;
  char *buf;

  n = pic_get_args(pic, "i|o", &k, &port);

  check_port_type(pic, port, FILE_READ);

  buf = pic_malloc(pic, k);

  i = pic_fread(pic, buf, 1, k, port);
  if (i == 0) {
    pic_free(pic, buf);
    return pic_eof_object(pic);
  }
  blob = pic_str_value(pic, buf, i);
  pic_free(pic, buf);
  return blob;
}

static pic_value
pic_port_read_line(pic_state *pic)
{
  pic_value port = pic_stdin(pic), str;
  int c;
  char s[1];

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_READ);

  if ((c = pic_fgetc(pic, port)) == EOF) {
    return pic_eof_object(pic);
  }
  s[0] = c;
  str = pic_str_value(pic, s, 1);

  while ((c = pic_fgetc(pic, port)) != EOF) {
    if (c == '\n')
      break;
    s[0] = c;
    str = pic_str_cat(pic, str, pic_str_value(pic, s, 1));
  }
  return str;
}

static pic_value
pic_port_write_u8(pic_state *pic)
{
  int i;
  pic_value port = pic_stdout(pic);

  pic_get_args(pic, "i|o", &i, &port);

  check_port_type(pic, port, FILE_WRITE);

  pic_fputc(pic, i, port);
  return pic_undef_value(pic);
}

static pic_value
pic_port_write_char(pic_state *pic)
{
  char c;
  pic_value port = pic_stdout(pic);

  pic_get_args(pic, "c|o", &c, &port);

  check_port_type(pic, port, FILE_WRITE);

  pic_fputc(pic, c, port);
  return pic_undef_value(pic);
}

static pic_value
pic_port_newline(pic_state *pic)
{
  pic_value port = pic_stdout(pic);

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_WRITE);

  pic_fputc(pic, '\n', port);
  return pic_undef_value(pic);
}

static pic_value
pic_port_write_bytevector(pic_state *pic)
{
  pic_value port;
  unsigned char *buf;
  int n, start, end, len, done;

  n = pic_get_args(pic, "b|oii", &buf, &len, &port, &start, &end);

  switch (n) {
  case 1:
    port = pic_stdout(pic);
  case 2:
    start = 0;
  case 3:
    end = len;
  }

  VALID_RANGE(pic, len, start, end);

  check_port_type(pic, port, FILE_WRITE);

  done = 0;
  while (done < end - start) {
    done += pic_fwrite(pic, buf + start + done, 1, end - start - done, port);
    /* FIXME: error check... */
  }
  return pic_undef_value(pic);
}

static pic_value
pic_port_write_string(pic_state *pic)
{
  pic_value str, port;
  int n, start, end, len, done;
  const char *buf;

  n = pic_get_args(pic, "s|oii", &str, &port, &start, &end);

  buf = pic_str(pic, str, &len);

  switch (n) {
  case 1:
    port = pic_stdout(pic);
  case 2:
    start = 0;
  case 3:
    end = len;
  }

  VALID_RANGE(pic, len, start, end);

  check_port_type(pic, port, FILE_WRITE);

  done = 0;
  while (done < end - start) {
    done += pic_fwrite(pic, buf + start + done, 1, end - start - done, port);
    /* FIXME: error check... */
  }
  return pic_undef_value(pic);
}

static pic_value
pic_port_flush(pic_state *pic)
{
  pic_value port = pic_stdout(pic);

  pic_get_args(pic, "|o", &port);

  check_port_type(pic, port, FILE_WRITE);

  pic_fflush(pic, port);
  return pic_undef_value(pic);
}

void
pic_init_port(pic_state *pic)
{
#if !PIC_USE_FILE
  pic_defvar(pic, "current-input-port", pic_false_value(pic));
  pic_defvar(pic, "current-output-port", pic_false_value(pic));
  pic_defvar(pic, "current-error-port", pic_false_value(pic));
#endif

  pic_defun(pic, "port?", pic_port_port_p);
  pic_defun(pic, "input-port?", pic_port_input_port_p);
  pic_defun(pic, "output-port?", pic_port_output_port_p);
  pic_defun(pic, "port-open?", pic_port_port_open_p);
  pic_defun(pic, "close-port", pic_port_close_port);

  pic_defun(pic, "eof-object?", pic_port_eof_object_p);
  pic_defun(pic, "eof-object", pic_port_eof_object);

  /* input */
  pic_defun(pic, "read-u8", pic_port_read_u8);
  pic_defun(pic, "peek-u8", pic_port_peek_u8);
  pic_defun(pic, "read-char", pic_port_read_char);
  pic_defun(pic, "peek-char", pic_port_peek_char);
  pic_defun(pic, "read-bytevector!", pic_port_read_bytevector_ip);
  pic_defun(pic, "read-bytevector", pic_port_read_bytevector);
  pic_defun(pic, "read-string", pic_port_read_string);
  pic_defun(pic, "read-line", pic_port_read_line);

  /* output */
  pic_defun(pic, "write-u8", pic_port_write_u8);
  pic_defun(pic, "write-char", pic_port_write_char);
  pic_defun(pic, "newline", pic_port_newline);
  pic_defun(pic, "write-bytevector", pic_port_write_bytevector);
  pic_defun(pic, "write-string", pic_port_write_string);
  pic_defun(pic, "flush-output-port", pic_port_flush);

  /* string I/O */
  pic_defun(pic, "open-input-bytevector", pic_port_open_input_bytevector);
  pic_defun(pic, "open-output-bytevector", pic_port_open_output_bytevector);
  pic_defun(pic, "get-output-bytevector", pic_port_get_output_bytevector);
  pic_defun(pic, "open-input-string", pic_port_open_input_string);
  pic_defun(pic, "open-output-string", pic_port_open_output_string);
  pic_defun(pic, "get-output-string", pic_port_get_output_string);
}

#endif