new html preprocessorgaius

5 files changed, 1543 insertions, 0 deletions

diff --git a/src/preproc/html/Makefile.sub b/src/preproc/html/Makefile.sub
new file mode 100644
index 00000000..9d5045a9
--- /dev/null
+++ b/src/preproc/html/Makefile.sub
@@ -0,0 +1,7 @@
+PROG=pre-grohtml
+# MAN1=pre-grohtml.n
+MAN1=
+XLIBS=$(LIBGROFF)
+OBJS=pre-html.o pushbackbuffer.o
+CCSRCS=$(srcdir)/pre-html.cc $(srcdir)/pushbackbuffer.cc
+NAMEPREFIX=$(g)
diff --git a/src/preproc/html/pre-html.cc b/src/preproc/html/pre-html.cc
new file mode 100644
index 00000000..61b8a56f
--- /dev/null
+++ b/src/preproc/html/pre-html.cc
@@ -0,0 +1,1108 @@
+// -*- C++ -*-
+/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+     Written by Gaius Mulley (gaius@glam.ac.uk).
+
+This file is part of groff.
+
+groff 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 2, or (at your option) any later
+version.
+
+groff 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.
+
+You should have received a copy of the GNU General Public License along
+with groff; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#define PREHTMLC
+
+#include <stdio.h>
+#include <signal.h>
+#include <ctype.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "lib.h"
+#include "errarg.h"
+#include "error.h"
+#include "stringclass.h"
+#include "posix.h"
+
+#include <errno.h>
+#include <sys/types.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef _POSIX_VERSION
+#include <sys/wait.h>
+#define PID_T pid_t
+#else /* not _POSIX_VERSION */
+#define PID_T int
+#endif /* not _POSIX_VERSION */
+
+extern char *strerror();
+
+#include "pre-html.h"
+#include "pushbackbuffer.h"
+#include "html-strings.h"
+
+#define POSTSCRIPTRES          72000   // maybe there is a better way to find this? --fixme--
+#define DEFAULT_IMAGE_RES         80   // 80 pixels per inch resolution
+#define DEFAULT_VERTICAL_OFFSET   40   // 40/72 of an inch
+#define IMAGE_BOARDER_PIXELS      10
+
+#define TRANSPARENT  "-background \"#FFF\" -transparent \"#FFF\""
+
+// #define  DEBUGGING
+// #define  DEBUG_HTML
+
+#if !defined(TRUE)
+#   define TRUE (1==1)
+#endif
+#if !defined(FALSE)
+#   define FALSE (1==0)
+#endif
+
+void stop() {}
+
+typedef enum {CENTERED, LEFT, RIGHT, INLINE} IMAGE_ALIGNMENT;
+
+static int   stdoutfd       = 1;                // output file descriptor - normally 1 but might move
+                                                // -1 means closed
+static int   copyofstdoutfd =-1;                // a copy of stdout, so we can restore stdout when
+                                                // writing to post-html
+static char *psFileName     = 0;                // name of postscript file
+static char *regionFileName = 0;                // name of file containing all image regions
+static char *imagePageStem  = 0;                // stem of all files containing page images
+static char *image_device   = "pnmraw";
+static int   image_res      = DEFAULT_IMAGE_RES;
+static int   vertical_offset= DEFAULT_VERTICAL_OFFSET;
+static char *image_template = 0;                // image template filename
+static int   troff_arg      = 0;                // troff arg index
+#if defined(DEBUGGING)
+static int   debug          = FALSE;
+static char *troffFileName  = 0;                // output of pre-html output which is sent to troff -Tps
+static char *htmlFileName   = 0;                // output of pre-html output which is sent to troff -Thtml
+#endif
+
+
+/*
+ *  Images are generated via postscript, gs and the pnm utilities.
+ */
+
+#define IMAGE_DEVICE    "-Tps"
+
+/*
+ *  prototypes
+ */
+static int do_file(const char *filename);
+
+/*
+ *  sys_fatal - writes a fatal error message. Taken from src/roff/groff/pipeline.c
+ */
+
+void sys_fatal (const char *s)
+{
+  fprintf(stderr, "%s: %s: %s", program_name, s, strerror(errno));
+}
+
+/*
+ *  the class and methods for retaining ascii text
+ */
+
+struct char_block {
+  enum { SIZE = 256 };
+  char          buffer[SIZE];
+  int           used;
+  char_block   *next;
+
+  char_block();
+};
+
+/*
+ *  char_block - constructor, sets the, used, and, next, fields to zero.
+ */
+
+char_block::char_block()
+: used(0), next(0)
+{
+}
+
+class char_buffer {
+public:
+  char_buffer();
+  ~char_buffer();
+  int  read_file(FILE *fp);
+  int  do_html(int argc, char *argv[]);
+  int  do_image(int argc, char *argv[]);
+  void write_file_html(void);
+  void write_file_troff(void);
+  void write_upto_newline (char_block **t, int *i);
+  int  can_see(char_block **t, int *i, char *string);
+  int  skip_spaces(char_block **t, int *i);
+  void skip_to_newline(char_block **t, int *i);
+private:
+  char_block *head;
+  char_block *tail;
+};
+
+/*
+ *  char_buffer - constructor
+ */
+
+char_buffer::char_buffer()
+: head(0), tail(0)
+{
+}
+
+/*
+ *  char_buffer - deconstructor, throws aways the whole buffer list.
+ */
+
+char_buffer::~char_buffer()
+{
+  while (head != 0) {
+    char_block *temp = head;
+    head = head->next;
+    delete temp;
+  }
+}
+
+/*
+ *  read_file - read in a complete file, fp, placing the contents inside char_blocks.
+ */
+
+int char_buffer::read_file (FILE *fp)
+{
+  int i=0;
+  unsigned int old_used;
+  int n;
+
+  while (! feof(fp)) {
+    if (tail == 0) {
+      tail = new char_block;
+      head = tail;
+    } else {
+      if (tail->used == char_block::SIZE) {
+	tail->next = new char_block;
+	tail       = tail->next;
+      }
+    }
+    // at this point we have a tail which is ready for the next SIZE bytes of the file
+
+    n = fread(tail->buffer, sizeof(char), char_block::SIZE-tail->used, fp);
+    if (n <= 0) {
+      // error
+      return( 0 );
+    } else {
+      tail->used += n*sizeof(char);
+    }
+  }
+  return( 1 );
+}
+
+/*
+ *  writeNbytes - writes n bytes to stdout.
+ */
+
+static void writeNbytes (char *s, int l)
+{
+  int n=0;
+  int r;
+
+  while (n<l) {
+    r = write(stdoutfd, s, l-n);
+    if (r<0) {
+      sys_fatal("write");
+    }
+    n += r;
+    s += r;
+  }
+}
+
+/*
+ *  writeString - writes a string to stdout.
+ */
+
+static void writeString (char *s)
+{
+  writeNbytes(s, strlen(s));
+}
+
+/*
+ *  makeFileName - creates the image filename template.
+ */
+
+void makeFileName ()
+{
+  char buffer[8192];
+
+  sprintf(buffer, "grohtml-%d", (int)getpid());
+  strcat(buffer, "-%d");
+  image_template = (char *)malloc(strlen(buffer)+1);
+  strcpy(image_template, buffer);
+}
+
+/*
+ *  write_end_image - ends the image. It writes out the image extents if we are using -Tps.
+ */
+
+static void write_end_image (int is_html)
+{
+  writeString(".html-end \\{\\\n");
+  if (is_html) {
+    /*
+     *  emit image name and enable output
+     */
+    writeString("\\O2\\O1\n");
+  } else {
+    /*
+     *  postscript, therefore emit image boundaries
+     */
+    writeString("\\O2\n");
+  }
+  writeString(".\\}\n");
+}
+
+/*
+ *  write_start_image - writes the troff which will:
+ *
+ *                      (i)  disable html output for the following image
+ *                      (ii) reset the max/min x/y registers during postscript
+ *                           rendering.
+ */
+
+static void write_start_image (IMAGE_ALIGNMENT pos, int is_html)
+{
+  writeString(".html-begin \\{\\\n");
+  switch (pos) {
+
+  case LEFT:
+    writeString(".    html-image l ");
+    break;
+  case RIGHT:
+    writeString(".    html-image r ");
+    break;
+  case INLINE:
+    writeString(".    html-image i ");
+    break;
+  case CENTERED:
+  default:
+    writeString(".    html-image c ");
+  }
+  writeString(image_template); writeString(".png\n");
+  if (is_html) {
+    writeString("\\O0\n");
+  } else {
+    writeString(".bp\n");
+    writeString(".tl ''''\n");
+    // reset min/max registers
+    writeString("\\O0\\O1\n");
+  }
+  writeString("\\}\n");
+}
+
+/*
+ *  write_upto_newline - writes the contents of the buffer until a newline is seen.
+ */
+
+void char_buffer::write_upto_newline (char_block **t, int *i)
+{
+  int j=*i;
+
+  if (*t) {
+    while ((j < (*t)->used) && ((*t)->buffer[j] != '\n')) {
+      j++;
+    }
+    if ((j < (*t)->used) && ((*t)->buffer[j] == '\n')) {
+      j++;
+    }
+    writeNbytes((*t)->buffer+(*i), j-(*i));
+    if (j == (*t)->used) {
+      *i = 0;
+      if ((*t)->buffer[j-1] == '\n') {
+	*t = (*t)->next;
+      } else {
+	*t = (*t)->next;
+	write_upto_newline(t, i);
+      }
+    } else {
+      // newline was seen
+      *i = j;
+    }
+  }
+}
+
+/*
+ *  can_see - returns TRUE if we can see string in t->buffer[i] onwards
+ */
+
+int char_buffer::can_see (char_block **t, int *i, char *string)
+{
+  int j         = 0;
+  int l         = strlen(string);
+  int k         = *i;
+  char_block *s = *t;
+
+  while (s) {
+    while ((k<s->used) && (j<l) && (s->buffer[k] == string[j])) {
+      j++;
+      k++;
+    }
+    if (j == l) {
+      *i = k;
+      *t = s;
+      return( TRUE );
+    } else if ((k<s->used) && (s->buffer[k] != string[j])) {
+      return( FALSE );
+    }
+    s = s->next;
+    k = 0;
+  }
+  return( FALSE );
+}
+
+/*
+ *  skip_spaces - returns TRUE if we have not run out of data.
+ *                It also consumes spaces.
+ */
+
+int char_buffer::skip_spaces(char_block **t, int *i)
+{
+  char_block *s = *t;
+  int k         = *i;
+
+  while (s) {
+    while ((k<s->used) && (isspace(s->buffer[k]))) {
+      k++;
+    }
+    if (k == s->used) {
+      k = 0;
+      s = s->next;
+    } else {
+      *i = k;
+      return( TRUE );
+    }
+  }
+  return( FALSE );
+}
+
+/*
+ *  skip_to_newline - skips all characters until a newline is seen.
+ *                    The newline is also consumed.
+ */
+
+void char_buffer::skip_to_newline (char_block **t, int *i)
+{
+  int j=*i;
+
+  if (*t) {
+    while ((j < (*t)->used) && ((*t)->buffer[j] != '\n')) {
+      j++;
+    }
+    if ((j < (*t)->used) && ((*t)->buffer[j] == '\n')) {
+      j++;
+    }
+    if (j == (*t)->used) {
+      *i = 0;
+      if ((*t)->buffer[j-1] == '\n') {
+	*t = (*t)->next;
+      } else {
+	*t = (*t)->next;
+	skip_to_newline(t, i);
+      }
+    } else {
+      // newline was seen
+      *i = j;
+    }
+  }
+}
+
+/*
+ *  write_file_troff - writes the buffer to stdout (troff).
+ */
+
+void char_buffer::write_file_troff (void)
+{
+  char_block *t=head;
+  int r;
+  int         i=0;
+
+  if (t != 0) {
+    do {
+      /*
+       *  remember to check the shortest string last
+       */
+      if (can_see(&t, &i, HTML_IMAGE_END)) {
+	write_end_image(FALSE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_LEFT)) {
+	write_start_image(LEFT, FALSE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_RIGHT)) {
+	write_start_image(RIGHT, FALSE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_INLINE)) {
+	write_start_image(INLINE, FALSE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_CENTERED)) {
+	write_start_image(CENTERED, FALSE);
+	skip_to_newline(&t, &i);
+      } else {
+	write_upto_newline(&t, &i);
+      }
+    } while (t != 0);
+  }
+  if (close(stdoutfd) < 0)
+    sys_fatal("close");
+
+  // now we grab fd=1 so that the next pipe cannot use fd=1
+  if (stdoutfd == 1) {
+    if (dup(2) != stdoutfd) {
+      sys_fatal("dup failed to use fd=1");
+    }
+  }
+}
+
+/*
+ *  the image class remembers the position of all images in the postscript file
+ *  and assigns names for each image.
+ */
+
+struct imageItem {
+  imageItem  *next;
+  int         X1;
+  int         Y1;
+  int         X2;
+  int         Y2;
+  char       *imageName;
+  int         resolution;
+  int         maxx;
+  int         pageNo;
+
+  imageItem (int x1, int y1, int x2, int y2, int page, int res, int max_width, char *name);
+  ~imageItem ();
+};
+
+/*
+ *  imageItem - constructor
+ */
+
+imageItem::imageItem (int x1, int y1, int x2, int y2, int page, int res, int max_width, char *name)
+{
+  X1         = x1;
+  Y1         = y1;
+  X2         = x2;
+  Y2         = y2;
+  pageNo     = page;
+  resolution = res;
+  maxx       = max_width;
+  imageName  = name;
+  next       = 0;
+}
+
+/*
+ *  imageItem - deconstructor
+ */
+
+imageItem::~imageItem ()
+{
+}
+
+/*
+ *  imageList - class containing a list of imageItems.
+ */
+
+class imageList {
+private:
+  imageItem *head;
+  imageItem *tail;
+  int        count;
+public:
+  imageList();
+  ~imageList();
+  void  add(int x1, int y1, int x2, int y2, int page, int res, int maxx, char *name);
+};
+
+/*
+ *  imageList - constructor.
+ */
+
+imageList::imageList ()
+  : head(0), tail(0), count(0)
+{
+}
+
+/*
+ *  imageList - deconstructor.
+ */
+
+imageList::~imageList ()
+{
+  while (head != 0) {
+    imageItem *i = head;
+    head = head->next;
+    delete i;
+  }
+}
+
+/*
+ *  createAllPages - creates a set of images, one per page.
+ */
+
+static void createAllPages (void)
+{
+  char buffer[4096];
+
+  sprintf(buffer,
+	  "echo showpage | gs -q -dSAFER -sDEVICE=%s -r%d -sOutputFile=%s%%d %s - > /dev/null 2>&1 \n",
+	  image_device,
+	  image_res,
+	  imagePageStem,
+	  psFileName);
+#if defined(DEBUGGING)
+  fwrite(buffer, sizeof(char), strlen(buffer), stderr);
+  fflush(stderr);
+#endif
+  system(buffer);
+}
+
+/*
+ *  removeAllPages - removes all page images.
+ */
+
+static void removeAllPages (void)
+{
+  char buffer[4096];
+
+#if !defined(DEBUGGING)
+  sprintf(buffer,
+	  "/bin/rm -f %s* \n",
+	  imagePageStem);
+  system(buffer);
+#endif
+}
+
+/*
+ *  abs - returns the absolute value.
+ */
+
+int abs (int x)
+{
+  if (x < 0) {
+    return( -x );
+  } else {
+    return( x );
+  }
+}
+
+/*
+ *  min - returns the minimum of two numbers.
+ */
+
+int min (int x, int y)
+{
+  if (x < y) {
+    return( x );
+  } else {
+    return( y );
+  }
+}
+
+/*
+ *  max - returns the maximum of two numbers.
+ */
+
+int max (int x, int y)
+{
+  if (x > y) {
+    return( x );
+  } else {
+    return( y );
+  }
+}
+
+/*
+ *  createImage - generates a minimal png file from the set of page images.
+ */
+
+static void createImage (imageItem *i)
+{
+  if (i->X1 != -1) {
+    char buffer[4096];
+    int  x1 = max(min(i->X1, i->X2)*image_res/POSTSCRIPTRES-1*IMAGE_BOARDER_PIXELS, 0);
+    int  y1 = max((image_res*vertical_offset/72)+min(i->Y1, i->Y2)*image_res/POSTSCRIPTRES, 0);
+    int  x2 = min(max(i->X1, i->X2)*image_res/POSTSCRIPTRES+1*IMAGE_BOARDER_PIXELS, i->maxx*image_res/POSTSCRIPTRES);
+    int  y2 = (image_res*vertical_offset/72)+max(i->Y1, i->Y2)*image_res/POSTSCRIPTRES+2*IMAGE_BOARDER_PIXELS;
+
+    sprintf(buffer,
+	    "pnmcut %d %d %d %d < %s%d | pnmtopng %s > %s \n",
+	    x1, y1, x2-x1, y2-y1,
+	    imagePageStem,
+	    i->pageNo,
+	    TRANSPARENT,
+	    i->imageName);
+#if defined(DEBUGGING)
+    fprintf(stderr, buffer);
+#endif
+    system(buffer);
+#if defined(DEBUGGING)
+  } else {
+    fprintf(stderr, "ignoring image as x1 coord is -1\n");
+    fflush(stderr);
+#endif
+  }
+}
+
+/*
+ *  add - an image description to the imageList.
+ */
+
+void imageList::add (int x1, int y1, int x2, int y2, int page, int res, int maxx, char *name)
+{
+  imageItem *i = new imageItem(x1, y1, x2, y2, page, res, maxx, name);
+
+  if (head == 0) {
+    head = i;
+    tail = i;
+  } else {
+    tail->next = i;
+    tail = i;
+  }
+  createImage(i);
+}
+
+static imageList listOfImages;  // list of images defined by the region file.
+
+/*
+ *  write_file_html - writes the buffer to stdout (troff).
+ *                    It writes out the file replacing template image names with
+ *                    actual image names.
+ */
+
+void char_buffer::write_file_html (void)
+{
+  char_block *t      =head;
+  char       *name;
+  int         i=0;
+
+  if (t != 0) {
+    stop();
+    do {
+      /*
+       *  remember to check the shortest string last
+       */
+      if (can_see(&t, &i, HTML_IMAGE_END)) {
+	write_end_image(TRUE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_LEFT)) {
+	write_start_image(LEFT, TRUE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_RIGHT)) {
+	write_start_image(RIGHT, TRUE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_INLINE)) {
+	stop();
+	write_start_image(INLINE, TRUE);
+	skip_to_newline(&t, &i);
+      } else if (can_see(&t, &i, HTML_IMAGE_CENTERED)) {
+	stop();
+	write_start_image(CENTERED, TRUE);
+	skip_to_newline(&t, &i);
+      } else {
+	write_upto_newline(&t, &i);
+      }
+    } while (t != 0);
+  }
+  if (close(stdoutfd) < 0)
+    sys_fatal("close");
+
+  // now we grab fd=1 so that the next pipe cannot use fd=1
+  if (stdoutfd == 1) {
+    if (dup(2) != stdoutfd) {
+      sys_fatal("dup failed to use fd=1");
+    }
+  }
+}
+
+/*
+ *  generateImages - parses the region file and generates images
+ *                   from the postscript file. The region file
+ *                   contains the x1,y1  x2,y2 extents of each
+ *                   image.
+ */
+
+static void generateImages (char *regionFileName)
+{
+  pushBackBuffer *f=new pushBackBuffer(regionFileName);
+  char ch;
+
+  while (f->putPB(f->getPB()) != eof) {
+    if (f->isString("grohtml-info:page")) {
+      int page   = f->readInt();
+      int x1     = f->readInt();
+      int y1     = f->readInt();
+      int x2     = f->readInt();
+      int y2     = f->readInt();
+      int maxx   = f->readInt();
+      char *name = f->readString();
+      int res    = POSTSCRIPTRES;  // --fixme--    prefer (f->readInt()) providing that troff can discover the value
+      listOfImages.add(x1, y1, x2, y2, page, res, maxx, name);
+      while ((f->putPB(f->getPB()) != '\n') &&
+	     (f->putPB(f->getPB()) != eof)) {
+	ch = f->getPB();
+      }
+      if (f->putPB(f->getPB()) == '\n') {
+	ch = f->getPB();
+      }
+    } else {
+      /*
+       *  write any error messages out to the user
+       */
+      fputc(f->getPB(), stderr);
+    }
+  }
+}
+
+/*
+ *  replaceFd - replace a file descriptor, was, with, willbe.
+ */
+
+static void replaceFd (int was, int willbe)
+{
+  int dupres;
+
+  if (was != willbe) {
+    if (close(was)<0) {
+      sys_fatal("close");
+    }
+    dupres = dup(willbe);
+    if (dupres != was) {
+      sys_fatal("dup");
+      fprintf(stderr, "trying to replace fd=%d with %d dup used %d\n", was, willbe, dupres);
+      if (willbe == 1) {
+	fprintf(stderr, "likely that stdout should be opened before %d\n", was);
+      }
+      exit(1);
+    }
+    if (close(willbe) < 0) {
+      sys_fatal("close");
+    }
+  }
+}
+
+/*
+ *  waitForChild - waits for child, pid, to exit.
+ */
+
+static void waitForChild (PID_T pid)
+{
+  PID_T waitpd;
+  int   status;
+
+  waitpd = wait(&status);
+  if (waitpd != pid)
+    sys_fatal("wait");
+}
+
+/*
+ *  alterDeviceTo - if toImage is set then the arg list is altered to include
+ *                     IMAGE_DEVICE and we invoke groff rather than troff.
+ *                  else 
+ *                     set -Thtml and troff
+ */
+
+static void alterDeviceTo (int argc, char *argv[], int toImage)
+{
+  int i=0;
+
+  if (toImage) {
+    while (i < argc) {
+      if (strcmp(argv[i], "-Thtml") == 0) {
+	argv[i] = IMAGE_DEVICE;
+      }
+      i++;
+    }
+    argv[troff_arg] = "groff";  /* rather than troff */
+  } else {
+    while (i < argc) {
+      if (strcmp(argv[i], IMAGE_DEVICE) == 0) {
+	argv[i] = "-Thtml";
+      }
+      i++;
+    }
+    argv[troff_arg] = "troff";  /* use troff */
+  }
+}
+
+/*
+ *  do_html - sets the troff number htmlflip and
+ *            writes out the buffer to troff -Thtml
+ */
+
+int char_buffer::do_html(int argc, char *argv[])
+{
+  int pdes[2];
+  PID_T pid;
+
+  if (pipe(pdes) < 0)
+    sys_fatal("pipe");
+
+  alterDeviceTo(argc, argv, 0);
+  argv += troff_arg;   // skip all arguments up to troff/groff
+  argc -= troff_arg;
+
+#if defined(DEBUG_HTML)
+  write_file_html();
+  writeString("--------------- troff --------------------------\n");
+  write_file_troff();
+#else
+  pid = fork();
+  if (pid < 0)
+    sys_fatal("fork");
+
+  if (pid == 0) {
+    // child
+    replaceFd(0, pdes[0]);
+    // close end we are not using
+    if (close(pdes[1])<0)
+      sys_fatal("close");
+    replaceFd(1, copyofstdoutfd); // and restore stdout
+
+    execvp(argv[0], argv);
+    error("couldn't exec %1: %2", argv[0], strerror(errno), (char *)0);
+    fflush(stderr);		/* just in case error() doesn't */
+    exit(1);
+  } else {
+    // parent
+
+#if defined(DEBUGGING)
+    /*
+     *  slight security risk so only enabled if compiled with defined(DEBUGGING)
+     */
+    if (debug) {
+      replaceFd(1, creat(htmlFileName, S_IWUSR|S_IRUSR));
+      write_file_html();
+    }
+#endif
+    replaceFd(1, pdes[1]);
+    // close end we are not using
+    if (close(pdes[0])<0)
+      sys_fatal("close");
+
+    write_file_html();
+    waitForChild(pid);
+  }
+#endif
+  return( 0 );
+}
+
+/*
+ *  addps4html - appends -rps4html=1 onto the command list for troff.
+ */
+
+char **addps4html (int argc, char *argv[])
+{
+  char **new_argv = (char **)malloc((argc+2)*sizeof(char *));
+  int   i=0;
+
+  while (i<argc) {
+    new_argv[i] = argv[i];
+    i++;
+  }
+  new_argv[argc] = "-rps4html=1";
+  argc++;
+  new_argv[argc] = NULL;
+  return( new_argv );
+}
+
+/*
+ *  do_image - writes out the buffer to troff -Tps
+ */
+
+int char_buffer::do_image(int argc, char *argv[])
+{
+  PID_T pid;
+  int pdes[2];
+
+  if (pipe(pdes) < 0)
+    sys_fatal("pipe");
+
+  alterDeviceTo(argc, argv, 1);
+  argv += troff_arg;   // skip all arguments up to troff/groff
+  argc -= troff_arg;
+  argv = addps4html(argc, argv);
+  argc++;
+
+  pid = fork();
+  if (pid == 0) {
+    // child
+
+    int psFd     = creat(psFileName,     S_IWUSR|S_IRUSR);
+    int regionFd = creat(regionFileName, S_IWUSR|S_IRUSR);
+
+    replaceFd(1, psFd);
+    replaceFd(0, pdes[0]);
+    replaceFd(2, regionFd);
+
+    // close end we are not using
+    if (close(pdes[1])<0)
+      sys_fatal("close");
+
+    execvp(argv[0], argv);
+    error("couldn't exec %1: %2", argv[0], strerror(errno), (char *)0);
+    fflush(stderr);		/* just in case error() doesn't */
+    exit(1);
+  } else {
+    // parent
+
+#if defined(DEBUGGING)
+    /*
+     *  slight security risk so only enabled if compiled with defined(DEBUGGING)
+     */
+    if (debug) {
+      replaceFd(1, creat(troffFileName, S_IWUSR|S_IRUSR));
+      write_file_troff();
+    }
+#endif
+    replaceFd(1, pdes[1]);
+    write_file_troff();
+    waitForChild(pid);
+  }
+  return( 0 );
+}
+
+static char_buffer inputFile;
+
+
+/*
+ *  usage - emit usage arguments and exit.
+ */
+
+void usage()
+{
+  fprintf(stderr, "usage: %s troffname [-P-o vertical_image_offset] [-P-i image_resolution] [troff flags] [files]\n", program_name);
+  fprintf(stderr, "    vertical_image_offset (default %d/72 of an inch)\n", vertical_offset);
+  fprintf(stderr, "    image_resolution (default %d) pixels per inch\n", image_res);
+}
+
+/*
+ *  scanArguments - scans for -P-i and -P-o arguments.
+ */
+
+int scanArguments (int argc, char **argv)
+{
+  int i=1;
+
+  while (i<argc) {
+    if (strncmp(argv[i], "-i", 2) == 0) {
+      image_res = atoi((char *)(argv[i]+2));
+    } else if (strncmp(argv[i], "-o", 2) == 0) {
+      vertical_offset = atoi((char *)(argv[i]+2));
+    } else if (strcmp(argv[i], "-v") == 0) {
+      extern const char *Version_string;
+      printf("GNU pre-grohtml (groff) version %s\n", Version_string);
+      exit(0);
+    } else if ((strcmp(argv[i], "-h") == 0) || (strcmp(argv[i], "-?") == 0)) {
+      usage();
+      exit(0);
+    } else if (strcmp(argv[i], "troff") == 0) {
+      /* remember troff argument number */
+      troff_arg = i;
+#if defined(DEBUGGING)
+    } else if (strcmp(argv[i], "-d") == 0) {
+      debug = TRUE;
+#endif
+    } else if (argv[i][0] != '-') {
+      return( i );
+    }
+    i++;
+  }
+  return( argc );
+}
+
+/*
+ *  makeTempFiles - name the temporary files
+ */
+
+static void makeTempFiles (void)
+{
+#if defined(DEBUGGING)
+  psFileName     = "/tmp/prehtml-ps";
+  regionFileName = "/tmp/prehtml-region";
+  imagePageStem  = "/tmp/prehtml-page";
+  troffFileName  = "/tmp/prehtml-troff";
+  htmlFileName   = "/tmp/prehtml-html";
+#else
+  psFileName     = mktemp(xtmptemplate("-ps-"));
+  regionFileName = mktemp(xtmptemplate("-regions-"));
+  imagePageStem  = mktemp(xtmptemplate("-page-"));
+#endif
+}
+
+int main(int argc, char **argv)
+{
+  program_name = argv[0];
+  int i;
+  int found=0;
+  int ok=1;
+
+  makeFileName();
+  i = scanArguments(argc, argv);
+  while (i < argc) {
+    if (argv[i][0] != '-') {
+      /* found source file */
+      ok = do_file(argv[i]);
+      if (! ok) {
+	return( 0 );
+      }
+      found = 1;
+    }
+    i++;
+  }
+
+  copyofstdoutfd=dup(stdoutfd);
+
+  if (! found) {
+    do_file("-");
+  }
+  makeTempFiles();
+  ok = inputFile.do_image(argc, argv);
+  if (ok == 0) {
+    createAllPages();
+    generateImages(regionFileName);
+    ok = inputFile.do_html(argc, argv);
+    removeAllPages();
+  }
+  return ok;
+}
+
+static int do_file(const char *filename)
+{
+  FILE *fp;
+
+  current_filename = filename;
+  if (strcmp(filename, "-") == 0) {
+    fp = stdin;
+  } else {
+    fp = fopen(filename, "r");
+    if (fp == 0) {
+      error("can't open `%1': %2", filename, strerror(errno));
+      return 0;
+    }
+  }
+
+  if (inputFile.read_file(fp)) {
+  }
+
+  if (fp != stdin)
+    fclose(fp);
+  current_filename = 0;
+  return 1;
+}
diff --git a/src/preproc/html/pre-html.h b/src/preproc/html/pre-html.h
new file mode 100644
index 00000000..f9a590c1
--- /dev/null
+++ b/src/preproc/html/pre-html.h
@@ -0,0 +1,37 @@
+// -*- C++ -*-
+/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+     Written by Gaius Mulley (gaius@glam.ac.uk).
+
+This file is part of groff.
+
+groff 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 2, or (at your option) any later
+version.
+
+groff 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.
+
+You should have received a copy of the GNU General Public License along
+with groff; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/*
+ *  defines functions implemented within pre-html.c
+ */
+
+#if !defined(PREHTMLH)
+#  define PREHTMLH
+#  if defined(PREHTMLC)
+#     define EXTERN
+#  else
+#     define EXTERN extern
+#  endif
+
+
+extern void sys_fatal (const char *s);
+
+#undef EXTERN
+#endif
diff --git a/src/preproc/html/pushbackbuffer.cc b/src/preproc/html/pushbackbuffer.cc
new file mode 100755
index 00000000..1d380f4d
--- /dev/null
+++ b/src/preproc/html/pushbackbuffer.cc
@@ -0,0 +1,337 @@
+// -*- C++ -*-
+/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+     Written by Gaius Mulley (gaius@glam.ac.uk).
+
+This file is part of groff.
+
+groff 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 2, or (at your option) any later
+version.
+
+groff 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.
+
+You should have received a copy of the GNU General Public License along
+with groff; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include <stdio.h>
+#include <signal.h>
+#include <ctype.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "lib.h"
+#include "errarg.h"
+#include "error.h"
+#include "stringclass.h"
+#include "posix.h"
+
+#include <errno.h>
+#include <sys/types.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "pushbackbuffer.h"
+#include "pre-html.h"
+
+#if !defined(TRUE)
+#   define TRUE  (1==1)
+#endif
+
+#if !defined(FALSE)
+#   define FALSE (1==0)
+#endif
+
+#   define ERROR(X)         (fprintf(stderr, "%s:%d error %s\n", __FILE__, __LINE__, X) && \
+                            (fflush(stderr)) && localexit(1))
+
+
+#define MAXPUSHBACKSTACK 4096                  /* maximum number of character that can be pushed back */
+
+
+/*
+ *  constructor for pushBackBuffer
+ */
+
+pushBackBuffer::pushBackBuffer (char *filename)
+{
+  charStack = (char *)malloc(MAXPUSHBACKSTACK);
+  if (charStack == 0) {
+    sys_fatal("malloc");
+  }
+  stackPtr = 0;   /* index to push back stack        */
+  debug    = 0;
+  verbose  = 0;
+  eofFound = FALSE;
+  lineNo   = 1;
+  if (strcmp(filename, "") != 0) {
+    stdIn = dup(0);
+    close(0);
+    if (open(filename, O_RDONLY) != 0) {
+      sys_fatal("when trying to open file");
+    } else {
+      fileName = filename;
+    }
+  }
+}
+
+pushBackBuffer::~pushBackBuffer ()
+{
+  int old;
+
+  if (charStack != 0) {
+    free(charStack);
+  }
+  close(0);
+  /* restore stdin in file descriptor 0 */
+  old = dup(stdIn);
+  close(stdIn);
+}
+
+/*
+ *  localexit - wraps exit with a return code to aid the ERROR macro.
+ */
+
+int localexit (int i)
+{
+  exit(i);
+  return( 1 );
+}
+
+/*
+ *  getPB - returns a character, possibly a pushed back character.
+ */
+
+char pushBackBuffer::getPB (void)
+{
+  if (stackPtr>0) {
+    stackPtr--;
+    return( charStack[stackPtr] );
+  } else {
+    char ch;
+
+    if (read(0, &ch, 1) == 1) {
+      if (verbose) {
+	printf("%c", ch);
+      }
+      if (ch == '\n') {
+	lineNo++;
+      }
+      return( ch );
+    } else {
+      eofFound = TRUE;
+      return( eof );
+    }
+  }
+}
+
+/*
+ *  putPB - pushes a character onto the push back stack.
+ *          The same character is returned.
+ */
+
+char pushBackBuffer::putPB (char ch)
+{
+  if (stackPtr<MAXPUSHBACKSTACK) {
+    charStack[stackPtr] = ch ;
+    stackPtr++;
+  } else {
+    ERROR("max push back stack exceeded, increase MAXPUSHBACKSTACK constant");
+  }
+  return( ch );
+}
+
+/*
+ *  isWhite - returns TRUE if a white character is found. This character is NOT consumed.
+ */
+
+static int isWhite (char ch)
+{
+  return( (ch==' ') || (ch == '\t') || (ch == '\n') );
+}
+
+/*
+ *  skipToNewline - skips characters until a newline is seen.
+ */
+
+void pushBackBuffer::skipToNewline (void)
+{
+  char ch;
+
+  while ((putPB(getPB()) != '\n') && (! eofFound)) {
+    ch = getPB();
+  }
+}
+
+/*
+ *  skipUntilToken - skips until a token is seen
+ */
+
+void pushBackBuffer::skipUntilToken (void)
+{
+  char ch;
+
+  while ((isWhite(putPB(getPB())) || (putPB(getPB()) == '#')) && (! eofFound)) {
+    ch = getPB();
+    if (ch == '#') {
+      skipToNewline();
+    }
+  }
+}
+
+/*
+ *  isString - returns TRUE if the string, s, matches the pushed back string.
+ *             if TRUE is returned then this string is consumed, otherwise it is
+ *             left alone.
+ */
+
+int pushBackBuffer::isString (char *s)
+{
+  int length=strlen(s);
+  int i=0;
+  int j;
+
+  while ((i<length) && (putPB(getPB())==s[i])) {
+    if (getPB() != s[i]) {
+      ERROR("assert failed");
+    }
+    i++;
+  }
+  if (i==length) {
+    return( TRUE );
+  } else {
+    i--;
+    while (i>=0) {
+      if (putPB(s[i]) != s[i]) {
+	ERROR("assert failed");
+      }
+      i--;
+    }
+  }
+  return( FALSE );
+}
+
+/*
+ *  isDigit - returns TRUE if the character, ch, is a digit.
+ */
+
+static int isDigit (char ch)
+{
+  return( ((ch>='0') && (ch<='9')) );
+}
+
+/*
+ *  isHexDigit - returns TRUE if the character, ch, is a hex digit.
+ */
+
+static int isHexDigit (char ch)
+{
+  return( (isDigit(ch)) || ((ch>='a') && (ch<='f')) );
+}
+
+/*
+ *  readInt - returns an integer from the input stream.
+ */
+
+int pushBackBuffer::readInt (void)
+{
+  int  c =0;
+  int  i =0;
+  int  s =1;
+  char ch=getPB();
+
+  while (isWhite(ch)) {
+    ch=getPB();
+  }
+  // now read integer
+
+  if (ch == '-') {
+    s = -1;
+    ch = getPB();
+  }
+  while (isDigit(ch)) {
+    i *= 10;
+    if ((ch>='0') && (ch<='9')) {
+      i += (int)(ch-'0');
+    }
+    ch = getPB();
+    c++;
+  }
+  if (ch != putPB(ch)) {
+    ERROR("assert failed");
+  }
+  return( i*s );
+}
+
+/*
+ *  convertToFloat - converts integers, a and b into a.b
+ */
+
+static float convertToFloat (int a, int b)
+{
+  int c=10;
+  float f;
+
+  while (b>c) {
+    c *= 10;
+  }
+  f = ((float)a) + (((float)b)/((float)c));
+  return( f );
+}
+
+/*
+ *  readNumber - returns a float representing the word just read.
+ */
+
+float pushBackBuffer::readNumber (void)
+{
+  int  integer;
+  int  fraction;
+  char ch;
+  float f;
+
+  integer = readInt();
+  if (putPB(getPB()) == '.') {
+    ch = getPB();
+    fraction = readInt();
+    f = convertToFloat(integer, fraction);
+    return( f );
+  } else {
+    return( (float)integer );
+  }
+}
+
+/*
+ *  readString - reads a string terminated by white space
+ *               and returns a malloced area of memory containing
+ *               a copy of the characters.
+ */
+
+char *pushBackBuffer::readString (void)
+{
+  char  buffer[MAXPUSHBACKSTACK];
+  char *string = 0;
+  int   i=0;
+  char ch=getPB();
+
+  while (isWhite(ch)) {
+    ch=getPB();
+  }
+  while ((i < MAXPUSHBACKSTACK) && (! isWhite(ch)) && (! eofFound)) {
+    buffer[i] = ch;
+    i++;
+    ch = getPB();
+  }
+  if (i < MAXPUSHBACKSTACK) {
+    buffer[i] = (char)0;
+    string = (char *)malloc(strlen(buffer)+1);
+    strcpy(string, buffer);
+  }
+  return( string );
+}
diff --git a/src/preproc/html/pushbackbuffer.h b/src/preproc/html/pushbackbuffer.h
new file mode 100755
index 00000000..93cb3f1a
--- /dev/null
+++ b/src/preproc/html/pushbackbuffer.h
@@ -0,0 +1,54 @@
+// -*- C -*-
+/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+     Written by Gaius Mulley (gaius@glam.ac.uk).
+
+This file is part of groff.
+
+groff 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 2, or (at your option) any later
+version.
+
+groff 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.
+
+You should have received a copy of the GNU General Public License along
+with groff; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+
+#define eof              (char)-1
+
+
+/*
+ *  defines the class and methods implemented within pushbackbuffer.cc
+ */
+
+class pushBackBuffer
+{
+ private:
+  char       *charStack;
+  int         stackPtr;   /* index to push back stack        */
+  int         debug;
+  int         verbose;
+  int         eofFound;
+  char       *fileName;
+  int         lineNo;
+  int         stdIn;
+
+ public:
+        pushBackBuffer (char *);
+  ~     pushBackBuffer ();
+  char  getPB          (void);
+  char  putPB          (char ch);
+  void  skipUntilToken (void);
+  void  skipToNewline  (void);
+  float readNumber     (void);
+  int   readInt        (void);
+  char *readString     (void);
+  int   isString       (char *string);
+};
+
+