libgfortran/io/write.c

/* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
   Free Software Foundation, Inc.
   Contributed by Andy Vaught
   Namelist output contributed by Paul Thomas
   F2003 I/O support contributed by Jerry DeLisle

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#include "io.h"
#include <assert.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdbool.h>
#include <errno.h>
#define star_fill(p, n) memset(p, '*', n)

#include "write_float.def"

typedef unsigned char uchar;

/* Write out default char4.  */

static void
write_default_char4 (st_parameter_dt *dtp, gfc_char4_t *source,
		     int src_len, int w_len)
{
  char *p;
  int j, k = 0;
  gfc_char4_t c;
  uchar d;
      
  /* Take care of preceding blanks.  */
  if (w_len > src_len)
    {
      k = w_len - src_len;
      p = write_block (dtp, k);
      if (p == NULL)
	return;
      memset (p, ' ', k);
    }

  /* Get ready to handle delimiters if needed.  */
  switch (dtp->u.p.current_unit->delim_status)
    {
    case DELIM_APOSTROPHE:
      d = '\'';
      break;
    case DELIM_QUOTE:
      d = '"';
      break;
    default:
      d = ' ';
      break;
    }

  /* Now process the remaining characters, one at a time.  */
  for (j = k; j < src_len; j++)
    {
      c = source[j];
    
      /* Handle delimiters if any.  */
      if (c == d && d != ' ')
	{
	  p = write_block (dtp, 2);
	  if (p == NULL)
	    return;
	  *p++ = (uchar) c;
	}
      else
	{
	  p = write_block (dtp, 1);
	  if (p == NULL)
	    return;
	}
      *p = c > 255 ? '?' : (uchar) c;
    }
}


/* Write out UTF-8 converted from char4.  */

static void
write_utf8_char4 (st_parameter_dt *dtp, gfc_char4_t *source,
		     int src_len, int w_len)
{
  char *p;
  int j, k = 0;
  gfc_char4_t c;
  static const uchar masks[6] =  { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
  static const uchar limits[6] = { 0x80, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE };
  int nbytes;
  uchar buf[6], d, *q; 

  /* Take care of preceding blanks.  */
  if (w_len > src_len)
    {
      k = w_len - src_len;
      p = write_block (dtp, k);
      if (p == NULL)
	return;
      memset (p, ' ', k);
    }

  /* Get ready to handle delimiters if needed.  */
  switch (dtp->u.p.current_unit->delim_status)
    {
    case DELIM_APOSTROPHE:
      d = '\'';
      break;
    case DELIM_QUOTE:
      d = '"';
      break;
    default:
      d = ' ';
      break;
    }

  /* Now process the remaining characters, one at a time.  */
  for (j = k; j < src_len; j++)
    {
      c = source[j];
      if (c < 0x80)
	{
	  /* Handle the delimiters if any.  */
	  if (c == d && d != ' ')
	    {
	      p = write_block (dtp, 2);
	      if (p == NULL)
		return;
	      *p++ = (uchar) c;
	    }
	  else
	    {
	      p = write_block (dtp, 1);
	      if (p == NULL)
		return;
	    }
	  *p = (uchar) c;
	}
      else
	{
	  /* Convert to UTF-8 sequence.  */
	  nbytes = 1;
	  q = &buf[6];

	  do
	    {
	      *--q = ((c & 0x3F) | 0x80);
	      c >>= 6;
	      nbytes++;
	    }
	  while (c >= 0x3F || (c & limits[nbytes-1]));

	  *--q = (c | masks[nbytes-1]);

	  p = write_block (dtp, nbytes);
	  if (p == NULL)
	    return;

	  while (q < &buf[6])
	    *p++ = *q++;
	}
    }
}


void
write_a (st_parameter_dt *dtp, const fnode *f, const char *source, int len)
{
  int wlen;
  char *p;

  wlen = f->u.string.length < 0
	 || (f->format == FMT_G && f->u.string.length == 0)
	 ? len : f->u.string.length;

#ifdef HAVE_CRLF
  /* If this is formatted STREAM IO convert any embedded line feed characters
     to CR_LF on systems that use that sequence for newlines.  See F2003
     Standard sections 10.6.3 and 9.9 for further information.  */
  if (is_stream_io (dtp))
    {
      const char crlf[] = "\r\n";
      int i, q, bytes;
      q = bytes = 0;

      /* Write out any padding if needed.  */
      if (len < wlen)
	{
	  p = write_block (dtp, wlen - len);
	  if (p == NULL)
	    return;
	  memset (p, ' ', wlen - len);
	}

      /* Scan the source string looking for '\n' and convert it if found.  */
      for (i = 0; i < wlen; i++)
	{
	  if (source[i] == '\n')
	    {
	      /* Write out the previously scanned characters in the string.  */
	      if (bytes > 0)
		{
		  p = write_block (dtp, bytes);
		  if (p == NULL)
		    return;
		  memcpy (p, &source[q], bytes);
		  q += bytes;
		  bytes = 0;
		}

	      /* Write out the CR_LF sequence.  */ 
	      q++;
	      p = write_block (dtp, 2);
              if (p == NULL)
                return;
	      memcpy (p, crlf, 2);
	    }
	  else
	    bytes++;
	}

      /*  Write out any remaining bytes if no LF was found.  */
      if (bytes > 0)
	{
	  p = write_block (dtp, bytes);
	  if (p == NULL)
	    return;
	  memcpy (p, &source[q], bytes);
	}
    }
  else
    {
#endif
      p = write_block (dtp, wlen);
      if (p == NULL)
	return;

      if (wlen < len)
	memcpy (p, source, wlen);
      else
	{
	  memset (p, ' ', wlen - len);
	  memcpy (p + wlen - len, source, len);
	}
#ifdef HAVE_CRLF
    }
#endif
}


/* The primary difference between write_a_char4 and write_a is that we have to
   deal with writing from the first byte of the 4-byte character and pay
   attention to the most significant bytes.  For ENCODING="default" write the
   lowest significant byte. If the 3 most significant bytes contain
   non-zero values, emit a '?'.  For ENCODING="utf-8", convert the UCS-32 value
   to the UTF-8 encoded string before writing out.  */

void
write_a_char4 (st_parameter_dt *dtp, const fnode *f, const char *source, int len)
{
  int wlen;
  gfc_char4_t *q;

  wlen = f->u.string.length < 0
	 || (f->format == FMT_G && f->u.string.length == 0)
	 ? len : f->u.string.length;

  q = (gfc_char4_t *) source;
#ifdef HAVE_CRLF
  /* If this is formatted STREAM IO convert any embedded line feed characters
     to CR_LF on systems that use that sequence for newlines.  See F2003
     Standard sections 10.6.3 and 9.9 for further information.  */
  if (is_stream_io (dtp))
    {
      const char crlf[] = "\r\n";
      int i, bytes;
      gfc_char4_t *qq;
      bytes = 0;

      /* Write out any padding if needed.  */
      if (len < wlen)
	{
	  char *p;
	  p = write_block (dtp, wlen - len);
	  if (p == NULL)
	    return;
	  memset (p, ' ', wlen - len);
	}

      /* Scan the source string looking for '\n' and convert it if found.  */
      qq = (gfc_char4_t *) source;
      for (i = 0; i < wlen; i++)
	{
	  if (qq[i] == '\n')
	    {
	      /* Write out the previously scanned characters in the string.  */
	      if (bytes > 0)
		{
		  if (dtp->u.p.current_unit->flags.encoding == ENCODING_UTF8)
		    write_utf8_char4 (dtp, q, bytes, 0);
		  else
		    write_default_char4 (dtp, q, bytes, 0);
		  bytes = 0;
		}

	      /* Write out the CR_LF sequence.  */ 
	      write_default_char4 (dtp, crlf, 2, 0);
	    }
	  else
	    bytes++;
	}

      /*  Write out any remaining bytes if no LF was found.  */
      if (bytes > 0)
	{
	  if (dtp->u.p.current_unit->flags.encoding == ENCODING_UTF8)
	    write_utf8_char4 (dtp, q, bytes, 0);
	  else
	    write_default_char4 (dtp, q, bytes, 0);
	}
    }
  else
    {
#endif
      if (dtp->u.p.current_unit->flags.encoding == ENCODING_UTF8)
	write_utf8_char4 (dtp, q, len, wlen);
      else
	write_default_char4 (dtp, q, len, wlen);
#ifdef HAVE_CRLF
    }
#endif
}


static GFC_INTEGER_LARGEST
extract_int (const void *p, int len)
{
  GFC_INTEGER_LARGEST i = 0;

  if (p == NULL)
    return i;

  switch (len)
    {
    case 1:
      {
	GFC_INTEGER_1 tmp;
	memcpy ((void *) &tmp, p, len);
	i = tmp;
      }
      break;
    case 2:
      {
	GFC_INTEGER_2 tmp;
	memcpy ((void *) &tmp, p, len);
	i = tmp;
      }
      break;
    case 4:
      {
	GFC_INTEGER_4 tmp;
	memcpy ((void *) &tmp, p, len);
	i = tmp;
      }
      break;
    case 8:
      {
	GFC_INTEGER_8 tmp;
	memcpy ((void *) &tmp, p, len);
	i = tmp;
      }
      break;
#ifdef HAVE_GFC_INTEGER_16
    case 16:
      {
	GFC_INTEGER_16 tmp;
	memcpy ((void *) &tmp, p, len);
	i = tmp;
      }
      break;
#endif
    default:
      internal_error (NULL, "bad integer kind");
    }

  return i;
}

static GFC_UINTEGER_LARGEST
extract_uint (const void *p, int len)
{
  GFC_UINTEGER_LARGEST i = 0;

  if (p == NULL)
    return i;

  switch (len)
    {
    case 1:
      {
	GFC_INTEGER_1 tmp;
	memcpy ((void *) &tmp, p, len);
	i = (GFC_UINTEGER_1) tmp;
      }
      break;
    case 2:
      {
	GFC_INTEGER_2 tmp;
	memcpy ((void *) &tmp, p, len);
	i = (GFC_UINTEGER_2) tmp;
      }
      break;
    case 4:
      {
	GFC_INTEGER_4 tmp;
	memcpy ((void *) &tmp, p, len);
	i = (GFC_UINTEGER_4) tmp;
      }
      break;
    case 8:
      {
	GFC_INTEGER_8 tmp;
	memcpy ((void *) &tmp, p, len);
	i = (GFC_UINTEGER_8) tmp;
      }
      break;
#ifdef HAVE_GFC_INTEGER_16
    case 16:
      {
	GFC_INTEGER_16 tmp;
	memcpy ((void *) &tmp, p, len);
	i = (GFC_UINTEGER_16) tmp;
      }
      break;
#endif
    default:
      internal_error (NULL, "bad integer kind");
    }

  return i;
}


void
write_l (st_parameter_dt *dtp, const fnode *f, char *source, int len)
{
  char *p;
  int wlen;
  GFC_INTEGER_LARGEST n;

  wlen = (f->format == FMT_G && f->u.w == 0) ? 1 : f->u.w;
  
  p = write_block (dtp, wlen);
  if (p == NULL)
    return;

  memset (p, ' ', wlen - 1);
  n = extract_int (source, len);
  p[wlen - 1] = (n) ? 'T' : 'F';
}


static void
write_int (st_parameter_dt *dtp, const fnode *f, const char *source, int len,
           const char *(*conv) (GFC_UINTEGER_LARGEST, char *, size_t))
{
  GFC_UINTEGER_LARGEST n = 0;
  int w, m, digits, nzero, nblank;
  char *p;
  const char *q;
  char itoa_buf[GFC_BTOA_BUF_SIZE];

  w = f->u.integer.w;
  m = f->u.integer.m;

  n = extract_uint (source, len);

  /* Special case:  */

  if (m == 0 && n == 0)
    {
      if (w == 0)
        w = 1;

      p = write_block (dtp, w);
      if (p == NULL)
        return;

      memset (p, ' ', w);
      goto done;
    }

  q = conv (n, itoa_buf, sizeof (itoa_buf));
  digits = strlen (q);

  /* Select a width if none was specified.  The idea here is to always
     print something.  */

  if (w == 0)
    w = ((digits < m) ? m : digits);

  p = write_block (dtp, w);
  if (p == NULL)
    return;

  nzero = 0;
  if (digits < m)
    nzero = m - digits;

  /* See if things will work.  */

  nblank = w - (nzero + digits);

  if (nblank < 0)
    {
      star_fill (p, w);
      goto done;
    }


  if (!dtp->u.p.no_leading_blank)
    {
      memset (p, ' ', nblank);
      p += nblank;
      memset (p, '0', nzero);
      p += nzero;
      memcpy (p, q, digits);
    }
  else
    {
      memset (p, '0', nzero);
      p += nzero;
      memcpy (p, q, digits);
      p += digits;
      memset (p, ' ', nblank);
      dtp->u.p.no_leading_blank = 0;
    }

 done:
  return;
}

static void
write_decimal (st_parameter_dt *dtp, const fnode *f, const char *source,
	       int len,
               const char *(*conv) (GFC_INTEGER_LARGEST, char *, size_t))
{
  GFC_INTEGER_LARGEST n = 0;
  int w, m, digits, nsign, nzero, nblank;
  char *p;
  const char *q;
  sign_t sign;
  char itoa_buf[GFC_BTOA_BUF_SIZE];

  w = f->u.integer.w;
  m = f->format == FMT_G ? -1 : f->u.integer.m;

  n = extract_int (source, len);

  /* Special case:  */
  if (m == 0 && n == 0)
    {
      if (w == 0)
        w = 1;

      p = write_block (dtp, w);
      if (p == NULL)
        return;

      memset (p, ' ', w);
      goto done;
    }

  sign = calculate_sign (dtp, n < 0);
  if (n < 0)
    n = -n;
  nsign = sign == S_NONE ? 0 : 1;
  
  /* conv calls itoa which sets the negative sign needed
     by write_integer. The sign '+' or '-' is set below based on sign
     calculated above, so we just point past the sign in the string
     before proceeding to avoid double signs in corner cases.
     (see PR38504)  */
  q = conv (n, itoa_buf, sizeof (itoa_buf));
  if (*q == '-')
    q++;

  digits = strlen (q);

  /* Select a width if none was specified.  The idea here is to always
     print something.  */

  if (w == 0)
    w = ((digits < m) ? m : digits) + nsign;

  p = write_block (dtp, w);
  if (p == NULL)
    return;

  nzero = 0;
  if (digits < m)
    nzero = m - digits;

  /* See if things will work.  */

  nblank = w - (nsign + nzero + digits);

  if (nblank < 0)
    {
      star_fill (p, w);
      goto done;
    }

  memset (p, ' ', nblank);
  p += nblank;

  switch (sign)
    {
    case S_PLUS:
      *p++ = '+';
      break;
    case S_MINUS:
      *p++ = '-';
      break;
    case S_NONE:
      break;
    }

  memset (p, '0', nzero);
  p += nzero;

  memcpy (p, q, digits);

 done:
  return;
}


/* Convert unsigned octal to ascii.  */

static const char *
otoa (GFC_UINTEGER_LARGEST n, char *buffer, size_t len)
{
  char *p;

  assert (len >= GFC_OTOA_BUF_SIZE);

  if (n == 0)
    return "0";

  p = buffer + GFC_OTOA_BUF_SIZE - 1;
  *p = '\0';

  while (n != 0)
    {
      *--p = '0' + (n & 7);
      n >>= 3;
    }

  return p;
}


/* Convert unsigned binary to ascii.  */

static const char *
btoa (GFC_UINTEGER_LARGEST n, char *buffer, size_t len)
{
  char *p;

  assert (len >= GFC_BTOA_BUF_SIZE);

  if (n == 0)
    return "0";

  p = buffer + GFC_BTOA_BUF_SIZE - 1;
  *p = '\0';

  while (n != 0)
    {
      *--p = '0' + (n & 1);
      n >>= 1;
    }

  return p;
}


/* gfc_itoa()-- Integer to decimal conversion.
   The itoa function is a widespread non-standard extension to standard
   C, often declared in <stdlib.h>.  Even though the itoa defined here
   is a static function we take care not to conflict with any prior
   non-static declaration.  Hence the 'gfc_' prefix, which is normally
   reserved for functions with external linkage.  */

static const char *
gfc_itoa (GFC_INTEGER_LARGEST n, char *buffer, size_t len)
{
  int negative;
  char *p;
  GFC_UINTEGER_LARGEST t;

  assert (len >= GFC_ITOA_BUF_SIZE);

  if (n == 0)
    return "0";

  negative = 0;
  t = n;
  if (n < 0)
    {
      negative = 1;
      t = -n; /*must use unsigned to protect from overflow*/
    }

  p = buffer + GFC_ITOA_BUF_SIZE - 1;
  *p = '\0';

  while (t != 0)
    {
      *--p = '0' + (t % 10);
      t /= 10;
    }

  if (negative)
    *--p = '-';
  return p;
}


void
write_i (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_decimal (dtp, f, p, len, (void *) gfc_itoa);
}


void
write_b (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_int (dtp, f, p, len, btoa);
}


void
write_o (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_int (dtp, f, p, len, otoa);
}

void
write_z (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_int (dtp, f, p, len, gfc_xtoa);
}


void
write_d (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_float (dtp, f, p, len);
}


void
write_e (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_float (dtp, f, p, len);
}


void
write_f (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_float (dtp, f, p, len);
}


void
write_en (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_float (dtp, f, p, len);
}


void
write_es (st_parameter_dt *dtp, const fnode *f, const char *p, int len)
{
  write_float (dtp, f, p, len);
}


/* Take care of the X/TR descriptor.  */

void
write_x (st_parameter_dt *dtp, int len, int nspaces)
{
  char *p;

  p = write_block (dtp, len);
  if (p == NULL)
    return;
  if (nspaces > 0 && len - nspaces >= 0)
    memset (&p[len - nspaces], ' ', nspaces);
}


/* List-directed writing.  */


/* Write a single character to the output.  Returns nonzero if
   something goes wrong.  */

static int
write_char (st_parameter_dt *dtp, char c)
{
  char *p;

  p = write_block (dtp, 1);
  if (p == NULL)
    return 1;

  *p = c;

  return 0;
}


/* Write a list-directed logical value.  */

static void
write_logical (st_parameter_dt *dtp, const char *source, int length)
{
  write_char (dtp, extract_int (source, length) ? 'T' : 'F');
}


/* Write a list-directed integer value.  */

static void
write_integer (st_parameter_dt *dtp, const char *source, int length)
{
  char *p;
  const char *q;
  int digits;
  int width;
  char itoa_buf[GFC_ITOA_BUF_SIZE];

  q = gfc_itoa (extract_int (source, length), itoa_buf, sizeof (itoa_buf));

  switch (length)
    {
    case 1:
      width = 4;
      break;

    case 2:
      width = 6;
      break;

    case 4:
      width = 11;
      break;

    case 8:
      width = 20;
      break;

    default:
      width = 0;
      break;
    }

  digits = strlen (q);

  if (width < digits)
    width = digits;
  p = write_block (dtp, width);
  if (p == NULL)
    return;
  if (dtp->u.p.no_leading_blank)
    {
      memcpy (p, q, digits);
      memset (p + digits, ' ', width - digits);
    }
  else
    {
      memset (p, ' ', width - digits);
      memcpy (p + width - digits, q, digits);
    }
}


/* Write a list-directed string.  We have to worry about delimiting
   the strings if the file has been opened in that mode.  */

static void
write_character (st_parameter_dt *dtp, const char *source, int kind, int length)
{
  int i, extra;
  char *p, d;

  switch (dtp->u.p.current_unit->delim_status)
    {
    case DELIM_APOSTROPHE:
      d = '\'';
      break;
    case DELIM_QUOTE:
      d = '"';
      break;
    default:
      d = ' ';
      break;
    }

  if (kind == 1)
    {
      if (d == ' ')
	extra = 0;
      else
	{
	  extra = 2;

	  for (i = 0; i < length; i++)
	    if (source[i] == d)
	      extra++;
	}

      p = write_block (dtp, length + extra);
      if (p == NULL)
	return;

      if (d == ' ')
	memcpy (p, source, length);
      else
	{
	  *p++ = d;

	  for (i = 0; i < length; i++)
            {
              *p++ = source[i];
              if (source[i] == d)
		*p++ = d;
	    }

	  *p = d;
	}
    }
  else
    {
      if (d == ' ')
	{
	  if (dtp->u.p.current_unit->flags.encoding == ENCODING_UTF8)
	    write_utf8_char4 (dtp, (gfc_char4_t *) source, length, 0);
	  else
	    write_default_char4 (dtp, (gfc_char4_t *) source, length, 0);
	}
      else
	{
	  p = write_block (dtp, 1);
	  *p = d;

	  if (dtp->u.p.current_unit->flags.encoding == ENCODING_UTF8)
	    write_utf8_char4 (dtp, (gfc_char4_t *) source, length, 0);
	  else
	    write_default_char4 (dtp, (gfc_char4_t *) source, length, 0);

	  p = write_block (dtp, 1);
	  *p = d;
	}
    }
}


/* Set an fnode to default format.  */

static void
set_fnode_default (st_parameter_dt *dtp, fnode *f, int length)
{
  f->format = FMT_G;
  switch (length)
    {
    case 4:
      f->u.real.w = 15;
      f->u.real.d = 8;
      f->u.real.e = 2;
      break;
    case 8:
      f->u.real.w = 25;
      f->u.real.d = 17;
      f->u.real.e = 3;
      break;
    case 10:
      f->u.real.w = 29;
      f->u.real.d = 20;
      f->u.real.e = 4;
      break;
    case 16:
      f->u.real.w = 44;
      f->u.real.d = 35;
      f->u.real.e = 4;
      break;
    default:
      internal_error (&dtp->common, "bad real kind");
      break;
    }
}
/* Output a real number with default format.
   This is 1PG14.7E2 for REAL(4), 1PG23.15E3 for REAL(8),
   1PG28.19E4 for REAL(10) and 1PG43.34E4 for REAL(16).  */

void
write_real (st_parameter_dt *dtp, const char *source, int length)
{
  fnode f ;
  int org_scale = dtp->u.p.scale_factor;
  dtp->u.p.scale_factor = 1;
  set_fnode_default (dtp, &f, length);
  write_float (dtp, &f, source , length);
  dtp->u.p.scale_factor = org_scale;
}


void
write_real_g0 (st_parameter_dt *dtp, const char *source, int length, int d)
{
  fnode f ;
  set_fnode_default (dtp, &f, length);
  if (d > 0)
    f.u.real.d = d;
  dtp->u.p.g0_no_blanks = 1;
  write_float (dtp, &f, source , length);
  dtp->u.p.g0_no_blanks = 0;
}


static void
write_complex (st_parameter_dt *dtp, const char *source, int kind, size_t size)
{
  char semi_comma =
	dtp->u.p.current_unit->decimal_status == DECIMAL_POINT ? ',' : ';';

  if (write_char (dtp, '('))
    return;
  write_real (dtp, source, kind);

  if (write_char (dtp, semi_comma))
    return;
  write_real (dtp, source + size / 2, kind);

  write_char (dtp, ')');
}


/* Write the separator between items.  */

static void
write_separator (st_parameter_dt *dtp)
{
  char *p;

  p = write_block (dtp, options.separator_len);
  if (p == NULL)
    return;

  memcpy (p, options.separator, options.separator_len);
}


/* Write an item with list formatting.
   TODO: handle skipping to the next record correctly, particularly
   with strings.  */

static void
list_formatted_write_scalar (st_parameter_dt *dtp, bt type, void *p, int kind,
			     size_t size)
{
  if (dtp->u.p.current_unit == NULL)
    return;

  if (dtp->u.p.first_item)
    {
      dtp->u.p.first_item = 0;
      write_char (dtp, ' ');
    }
  else
    {
      if (type != BT_CHARACTER || !dtp->u.p.char_flag ||
	dtp->u.p.current_unit->delim_status != DELIM_NONE)
      write_separator (dtp);
    }

  switch (type)
    {
    case BT_INTEGER:
      write_integer (dtp, p, kind);
      break;
    case BT_LOGICAL:
      write_logical (dtp, p, kind);
      break;
    case BT_CHARACTER:
      write_character (dtp, p, kind, size);
      break;
    case BT_REAL:
      write_real (dtp, p, kind);
      break;
    case BT_COMPLEX:
      write_complex (dtp, p, kind, size);
      break;
    default:
      internal_error (&dtp->common, "list_formatted_write(): Bad type");
    }

  dtp->u.p.char_flag = (type == BT_CHARACTER);
}


void
list_formatted_write (st_parameter_dt *dtp, bt type, void *p, int kind,
		      size_t size, size_t nelems)
{
  size_t elem;
  char *tmp;
  size_t stride = type == BT_CHARACTER ?
		  size * GFC_SIZE_OF_CHAR_KIND(kind) : size;

  tmp = (char *) p;

  /* Big loop over all the elements.  */
  for (elem = 0; elem < nelems; elem++)
    {
      dtp->u.p.item_count++;
      list_formatted_write_scalar (dtp, type, tmp + elem * stride, kind, size);
    }
}

/*			NAMELIST OUTPUT

   nml_write_obj writes a namelist object to the output stream.  It is called
   recursively for derived type components:
	obj    = is the namelist_info for the current object.
	offset = the offset relative to the address held by the object for
		 derived type arrays.
	base   = is the namelist_info of the derived type, when obj is a
		 component.
	base_name = the full name for a derived type, including qualifiers
		    if any.
   The returned value is a pointer to the object beyond the last one
   accessed, including nested derived types.  Notice that the namelist is
   a linear linked list of objects, including derived types and their
   components.  A tree, of sorts, is implied by the compound names of
   the derived type components and this is how this function recurses through
   the list.  */

/* A generous estimate of the number of characters needed to print
   repeat counts and indices, including commas, asterices and brackets.  */

#define NML_DIGITS 20

static void
namelist_write_newline (st_parameter_dt *dtp)
{
  if (!is_internal_unit (dtp))
    {
#ifdef HAVE_CRLF
      write_character (dtp, "\r\n", 1, 2);
#else
      write_character (dtp, "\n", 1, 1);
#endif
      return;
    }

  if (is_array_io (dtp))
    {
      gfc_offset record;
      int finished, length;

      length = (int) dtp->u.p.current_unit->bytes_left;
	      
      /* Now that the current record has been padded out,
	 determine where the next record in the array is. */
      record = next_array_record (dtp, dtp->u.p.current_unit->ls,
				  &finished);
      if (finished)
	dtp->u.p.current_unit->endfile = AT_ENDFILE;
      else
	{
	  /* Now seek to this record */
	  record = record * dtp->u.p.current_unit->recl;

	  if (sseek (dtp->u.p.current_unit->s, record, SEEK_SET) < 0)
	    {
	      generate_error (&dtp->common, LIBERROR_INTERNAL_UNIT, NULL);
	      return;
	    }

	  dtp->u.p.current_unit->bytes_left = dtp->u.p.current_unit->recl;
	}
    }
  else
    write_character (dtp, " ", 1, 1);
}


static namelist_info *
nml_write_obj (st_parameter_dt *dtp, namelist_info * obj, index_type offset,
	       namelist_info * base, char * base_name)
{
  int rep_ctr;
  int num;
  int nml_carry;
  int len;
  index_type obj_size;
  index_type nelem;
  size_t dim_i;
  size_t clen;
  index_type elem_ctr;
  size_t obj_name_len;
  void * p ;
  char cup;
  char * obj_name;
  char * ext_name;
  char rep_buff[NML_DIGITS];
  namelist_info * cmp;
  namelist_info * retval = obj->next;
  size_t base_name_len;
  size_t base_var_name_len;
  size_t tot_len;
  unit_delim tmp_delim;
  
  /* Set the character to be used to separate values
     to a comma or semi-colon.  */

  char semi_comma =
	dtp->u.p.current_unit->decimal_status == DECIMAL_POINT ? ',' : ';';

  /* Write namelist variable names in upper case. If a derived type,
     nothing is output.  If a component, base and base_name are set.  */

  if (obj->type != GFC_DTYPE_DERIVED)
    {
      namelist_write_newline (dtp);
      write_character (dtp, " ", 1, 1);

      len = 0;
      if (base)
	{
	  len = strlen (base->var_name);
	  base_name_len = strlen (base_name);
	  for (dim_i = 0; dim_i < base_name_len; dim_i++)
            {
	      cup = toupper (base_name[dim_i]);
	      write_character (dtp, &cup, 1, 1);
            }
	}
      clen = strlen (obj->var_name);
      for (dim_i = len; dim_i < clen; dim_i++)
	{
	  cup = toupper (obj->var_name[dim_i]);
	  write_character (dtp, &cup, 1, 1);
	}
      write_character (dtp, "=", 1, 1);
    }

  /* Counts the number of data output on a line, including names.  */

  num = 1;

  len = obj->len;

  switch (obj->type)
    {

    case GFC_DTYPE_REAL:
      obj_size = size_from_real_kind (len);
      break;

    case GFC_DTYPE_COMPLEX:
      obj_size = size_from_complex_kind (len);
      break;

    case GFC_DTYPE_CHARACTER:
      obj_size = obj->string_length;
      break;

    default:
      obj_size = len;      
    }

  if (obj->var_rank)
    obj_size = obj->size;

  /* Set the index vector and count the number of elements.  */

  nelem = 1;
  for (dim_i = 0; dim_i < (size_t) obj->var_rank; dim_i++)
    {
      obj->ls[dim_i].idx = obj->dim[dim_i].lbound;
      nelem = nelem * (obj->dim[dim_i].ubound + 1 - obj->dim[dim_i].lbound);
    }

  /* Main loop to output the data held in the object.  */

  rep_ctr = 1;
  for (elem_ctr = 0; elem_ctr < nelem; elem_ctr++)
    {

      /* Build the pointer to the data value.  The offset is passed by
	 recursive calls to this function for arrays of derived types.
	 Is NULL otherwise.  */

      p = (void *)(obj->mem_pos + elem_ctr * obj_size);
      p += offset;

      /* Check for repeat counts of intrinsic types.  */

      if ((elem_ctr < (nelem - 1)) &&
	  (obj->type != GFC_DTYPE_DERIVED) &&
	  !memcmp (p, (void*)(p + obj_size ), obj_size ))
	{
	  rep_ctr++;
	}

      /* Execute a repeated output.  Note the flag no_leading_blank that
	 is used in the functions used to output the intrinsic types.  */

      else
	{
	  if (rep_ctr > 1)
	    {
	      sprintf(rep_buff, " %d*", rep_ctr);
	      write_character (dtp, rep_buff, 1, strlen (rep_buff));
	      dtp->u.p.no_leading_blank = 1;
	    }
	  num++;

	  /* Output the data, if an intrinsic type, or recurse into this
	     routine to treat derived types.  */

	  switch (obj->type)
	    {

	    case GFC_DTYPE_INTEGER:
	      write_integer (dtp, p, len);
              break;

	    case GFC_DTYPE_LOGICAL:
	      write_logical (dtp, p, len);
              break;

	    case GFC_DTYPE_CHARACTER:
	      tmp_delim = dtp->u.p.current_unit->delim_status;
	      if (dtp->u.p.nml_delim == '"')
		dtp->u.p.current_unit->delim_status = DELIM_QUOTE;
	      if (dtp->u.p.nml_delim == '\'')
		dtp->u.p.current_unit->delim_status = DELIM_APOSTROPHE;
	      write_character (dtp, p, 1, obj->string_length);
		dtp->u.p.current_unit->delim_status = tmp_delim;
              break;

	    case GFC_DTYPE_REAL:
	      write_real (dtp, p, len);
              break;

	   case GFC_DTYPE_COMPLEX:
	      dtp->u.p.no_leading_blank = 0;
	      num++;
              write_complex (dtp, p, len, obj_size);
              break;

	    case GFC_DTYPE_DERIVED:

	      /* To treat a derived type, we need to build two strings:
		 ext_name = the name, including qualifiers that prepends
			    component names in the output - passed to
			    nml_write_obj.
		 obj_name = the derived type name with no qualifiers but %
			    appended.  This is used to identify the
			    components.  */

	      /* First ext_name => get length of all possible components  */

	      base_name_len = base_name ? strlen (base_name) : 0;
	      base_var_name_len = base ? strlen (base->var_name) : 0;
	      ext_name = (char*)get_mem ( base_name_len
					+ base_var_name_len
					+ strlen (obj->var_name)
					+ obj->var_rank * NML_DIGITS
					+ 1);

	      memcpy (ext_name, base_name, base_name_len);
	      clen = strlen (obj->var_name + base_var_name_len);
	      memcpy (ext_name + base_name_len, 
		      obj->var_name + base_var_name_len, clen);
	      
	      /* Append the qualifier.  */

	      tot_len = base_name_len + clen;
	      for (dim_i = 0; dim_i < (size_t) obj->var_rank; dim_i++)
		{
		  if (!dim_i)
		    {
		      ext_name[tot_len] = '(';
		      tot_len++;
		    }
		  sprintf (ext_name + tot_len, "%d", (int) obj->ls[dim_i].idx);
		  tot_len += strlen (ext_name + tot_len);
		  ext_name[tot_len] = ((int) dim_i == obj->var_rank - 1) ? ')' : ',';
		  tot_len++;
		}

	      ext_name[tot_len] = '\0';

	      /* Now obj_name.  */

	      obj_name_len = strlen (obj->var_name) + 1;
	      obj_name = get_mem (obj_name_len+1);
	      memcpy (obj_name, obj->var_name, obj_name_len-1);
	      memcpy (obj_name + obj_name_len-1, "%", 2);

	      /* Now loop over the components. Update the component pointer
		 with the return value from nml_write_obj => this loop jumps
		 past nested derived types.  */

	      for (cmp = obj->next;
		   cmp && !strncmp (cmp->var_name, obj_name, obj_name_len);
		   cmp = retval)
		{
		  retval = nml_write_obj (dtp, cmp,
					  (index_type)(p - obj->mem_pos),
					  obj, ext_name);
		}

	      free_mem (obj_name);
	      free_mem (ext_name);
	      goto obj_loop;

            default:
	      internal_error (&dtp->common, "Bad type for namelist write");
            }

	  /* Reset the leading blank suppression, write a comma (or semi-colon)
	     and, if 5 values have been output, write a newline and advance
	     to column 2. Reset the repeat counter.  */

	  dtp->u.p.no_leading_blank = 0;
	  write_character (dtp, &semi_comma, 1, 1);
	  if (num > 5)
	    {
	      num = 0;
	      namelist_write_newline (dtp);
	      write_character (dtp, " ", 1, 1);
	    }
	  rep_ctr = 1;
	}

    /* Cycle through and increment the index vector.  */

obj_loop:

    nml_carry = 1;
    for (dim_i = 0; nml_carry && (dim_i < (size_t) obj->var_rank); dim_i++)
      {
	obj->ls[dim_i].idx += nml_carry ;
	nml_carry = 0;
	if (obj->ls[dim_i].idx  > (index_type) obj->dim[dim_i].ubound)
	  {
	    obj->ls[dim_i].idx = obj->dim[dim_i].lbound;
	    nml_carry = 1;
	  }
       }
    }

  /* Return a pointer beyond the furthest object accessed.  */

  return retval;
}


/* This is the entry function for namelist writes.  It outputs the name
   of the namelist and iterates through the namelist by calls to
   nml_write_obj.  The call below has dummys in the arguments used in
   the treatment of derived types.  */

void
namelist_write (st_parameter_dt *dtp)
{
  namelist_info * t1, *t2, *dummy = NULL;
  index_type i;
  index_type dummy_offset = 0;
  char c;
  char * dummy_name = NULL;
  unit_delim tmp_delim = DELIM_UNSPECIFIED;

  /* Set the delimiter for namelist output.  */
  tmp_delim = dtp->u.p.current_unit->delim_status;

  dtp->u.p.nml_delim = tmp_delim == DELIM_APOSTROPHE ? '\'' : '"';

  /* Temporarily disable namelist delimters.  */
  dtp->u.p.current_unit->delim_status = DELIM_NONE;

  write_character (dtp, "&", 1, 1);

  /* Write namelist name in upper case - f95 std.  */
  for (i = 0 ;i < dtp->namelist_name_len ;i++ )
    {
      c = toupper (dtp->namelist_name[i]);
      write_character (dtp, &c, 1 ,1);
    }

  if (dtp->u.p.ionml != NULL)
    {
      t1 = dtp->u.p.ionml;
      while (t1 != NULL)
	{
	  t2 = t1;
	  t1 = nml_write_obj (dtp, t2, dummy_offset, dummy, dummy_name);
	}
    }

  namelist_write_newline (dtp);
  write_character (dtp, " /", 1, 2);
  /* Restore the original delimiter.  */
  dtp->u.p.current_unit->delim_status = tmp_delim;
}

#undef NML_DIGITS