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psnews.c

/*========================================================================*\

Copyright (c) 1994-1999  Paul Vojta

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
PAUL VOJTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

NOTES:
      This code was originally written by Ricardo Telichevesky
      (ricardo@rle-vlsi-mit.edu) and Luis Miguel Silveira
      (lms@rle-vlsi-mit.edu).
      It was largely influenced by similar code in the SeeTeX/XTeX
      package by Dirk Grunwald (grunwald@colorado.edu).

\*========================================================================*/

/* ||| To do:
 *    ALWAYS_CLOSE_SERVER_CONNECTION?
 *    Is there some way of interrupting a process?
 *    fork
 *    extra bytes on input
 */

#ifdef PS_NEWS /* whole file */

#include "xdvi-config.h"
#include <signal.h>
#include <sys/file.h>   /* this defines FASYNC */
#include <X11/X.h>
#include <X11/Xlib.h>
#undef SYSV /* To avoid defined SYSV_{WAIT,UCONTEXT} in xview/notify.h.  */
#include <NeWS/psio.h>
#include <xvps/pscanvas.h>

/* if POSIX O_NONBLOCK is not available, use O_NDELAY */
#if !defined(O_NONBLOCK) && defined(O_NDELAY)
#define     O_NONBLOCK O_NDELAY
#endif

/* Condition for retrying a write */
#include <errno.h>

#ifdef      X_NOT_STDC_ENV
extern      int   errno;
#endif

#ifdef      EWOULDBLOCK
#ifdef      EAGAIN
#define     AGAIN_CONDITION   (errno == EWOULDBLOCK || errno == EAGAIN)
#else /* EAGAIN */
#define     AGAIN_CONDITION   (errno == EWOULDBLOCK)
#endif      /* EAGAIN */
#else /* EWOULDBLOCK */
#ifdef      EAGAIN
#define     AGAIN_CONDITION   (errno == EAGAIN)
#endif      /* EAGAIN */
#endif      /* EWOULDBLOCK */

#if HAVE_POLL
# include <poll.h>
#else
# if HAVE_SYS_SELECT_H
#  include <sys/select.h>
# else
#  if HAVE_SELECT_H
#   include <select.h>
#  endif
# endif
#endif

#if !defined(FLAKY_SIGPOLL) && !HAVE_STREAMS && !defined(FASYNC)
#define     FLAKY_SIGPOLL     1
#endif

char  *strtok ARGS((char *, _Xconst char *));

#define     Fprintf     (void) fprintf


/* define ALWAYS_CLOSE_SERVER_CONNECTION if you want to close the server
   connection all the time */
#undef      ALWAYS_CLOSE_SERVER_CONNECTION


            /*
             * Some setup code.
             */
static      _Xconst     char  str0[]      = "\
/OW2? version cvi 2 eq def \
OW2? \
{ /setlinewidth { pop } def} \
{ /NeWS 3 0 findpackage beginpackage \
  /X11 3 0 findpackage beginpackage} \
ifelse \
currentcanvas /Color get \
currentcanvas /Colormap get getcubedescription null eq and \
   {8 {{currentcanvas /Colormap get 1 index dup dup dup newcube} stopped \
    {pop pop pop pop pop} {exit} ifelse \
    2 div cvi dup 1 eq {exit} if} loop pop} \
if\n";
            /*
             * This string reads chunks (delimited by %%xdvimark).
             * The first character of a chunk tells whether a given chunk
             * is to be done within save/restore or not.
             * The `H' at the end tells it that the first group is a
             * header; i.e., no save/restore.
             */
static      _Xconst     char  preamble[]  = "\
/xdvi$line 81 string def \
/xdvi$run {$error null ne {$error /newerror false put} if \
 {currentfile cvx stopped \
 $error null eq {false} {$error /newerror get} ifelse and \
 {handleerror} if} stopped pop} def \
/xdvi$dslen countdictstack def \
{currentfile read not {exit} if 72 eq \
    {xdvi$run} \
    {/xdvi$sav save def xdvi$run \
      clear countdictstack xdvi$dslen sub {end} repeat xdvi$sav restore} \
  ifelse \
  {(%%xdvimark) currentfile xdvi$line {readline} stopped \
    {clear} {{eq {false exit} if} {true exit} ifelse} ifelse }loop {exit} if \
  58 tagprint flush \
}loop\nH";

extern      _Xconst     char  psheader[];
extern      int   psheaderlen;

static      _Xconst     char  preamble2[] = " stop\n%%xdvimark\n";
#define     stopstring  preamble2

#define     postscript  resource._postscript


/* global procedures (besides initNeWS) */

static      void  toggleNeWS ARGS((void));
static      void  destroyNeWS ARGS((void));
static      void  interruptNeWS ARGS((void));
static      void  endpageNeWS ARGS((void));
static      void  drawbeginNeWS ARGS((int, int, _Xconst char *));
static      void  drawrawNeWS ARGS((_Xconst char *));
static      void  drawfileNeWS ARGS((_Xconst char *, FILE *));
static      void  drawendNeWS ARGS((_Xconst char *));
static      void  beginheaderNeWS ARGS((void));
static      void  endheaderNeWS ARGS((void));
static      void  newdocNeWS ARGS((void));

static      struct psprocs    news_procs = {
      /* toggle */            toggleNeWS,
      /* destroy */           destroyNeWS,
      /* interrupt */         interruptNeWS,
      /* endpage */           endpageNeWS,
      /* drawbegin */         drawbeginNeWS,
      /* drawraw */           drawrawNeWS,
      /* drawfile */          drawfileNeWS,
      /* drawend */           drawendNeWS,
      /* beginheader */ beginheaderNeWS,
      /* endheader */         endheaderNeWS,
      /* newdoc */            newdocNeWS};

/* signal handler to hairy PostScript code */
static RETSIGTYPE psio_sigpipe_handler();

/* define local static variables */
static      int   NeWS_mag;         /* magnification currently in use */
static      int   NeWS_shrink;            /* shrink factor currently in use */
static      unsigned int      NeWS_page_w;      /* how big our current page is */
static      unsigned int      NeWS_page_h;
static      Boolean     NeWS_active;            /* if we've started a page yet */
static      int   NeWS_pending;           /* number of ack's we're expecting */
static      int   NeWS_sending;           /* level of nesting in send() */
static      Boolean     NeWS_in_header;         /* if we're sending a header */
static      Boolean     NeWS_in_doc;            /* if we've sent header information */
static      Boolean     NeWS_pending_int; /* if interrupt rec'd while in send() */
static      Boolean     NeWS_destroyed    = False;


/*
 *    NeWS I/O code.  This should send PS code to NeWS,
 *    receive acknowledgements, and receive X events in the meantime.
 *    It also checks for SIGPIPE errors.
 */

#if HAVE_POLL
static      struct pollfd     fds[3] = {{0, POLLOUT, 0},
                          {0, POLLIN, 0},
                          {0, POLLIN, 0}};
#define     XDVI_ISSET(a, b, c)     (fds[c].revents)
#else
static      int         numfds;
static      fd_set            readfds;
static      fd_set            writefds;
#define     XDVI_ISSET(a, b, c)     FD_ISSET(a, b)
#endif


/*---------------------------------------------------------------------------*
  psio_sigpipe_handler  ()

  Arguments: sig, code, scp, addr (see man page for signal)
  Returns: (void)
  Side-Effects: SIGPIPE signal is flagged as sigpipe_error variable is set.

  Description:
  Handler for SIGPIPE error generated by a broken pipe in the connection
  to the NeWS server; this may be duer to some abnormal condition, or some
  hairy PostScript code containing commands not implemented by the server.

+----------------------------------------------------------------------------*/

static      Boolean     sigpipe_error = False;

static      struct sigaction psio_sigpipe_handler_struct;
      /* initialized to {psio_sigpipe_handler, (sigset_t) 0, 0} in initNeWS */

/* ARGSUSED */
static      RETSIGTYPE
psio_sigpipe_handler(sig, code, scp, addr)
      int         sig;
      int         code;
      struct sigcontext *scp;
      char        *addr;
{
      sigpipe_error = True;
}


/*
 *    read_from_NeWS - This does the actual retrieving of acknowledgements.
 *    If other bytes appear on the file - tough.
 */

static      void
read_from_NeWS()
{
      for (;;) {
          int retval;

          retval = ps_checkfor(PostScriptInput, PSIO_FIND_TAG, 58);
          if (retval == 0) break;
          if (retval < 0) {
            Fprintf(stderr, "[xdvik] ps_checkfor: %d\n", retval);
            return;
          }
          (void) ps_checkfor(PostScriptInput, PSIO_WAIT_TAG, 58);
          --NeWS_pending;
          if (debug & DBG_PS)
            Printf("Got NeWS ack; %d pending.\n", NeWS_pending);
      }
}


/*
 *    Clean up after send()
 */

static      void
post_send()
{
      if (sigpipe_error) {
          Fputs("NeWS died unexpectedly.\n", stderr);
          destroyNeWS();
          draw_bbox();
      }

      if (NeWS_pending_int) {
          NeWS_pending_int = False;
          interruptNeWS();
      }
}


/*
 *    This actually sends the bytes to NeWS.
 */

static      void
send(cp, len)
      _Xconst     char  *cp;
      int         len;
{
      struct sigaction orig;
#if HAVE_POLL
      int   retval;
#endif

      if (PostScript == (PSFILE *) NULL) return;

      if (!NeWS_sending) {
          (void) sigaction(SIGPIPE, &psio_sigpipe_handler_struct, &orig);
          sigpipe_error = False;
      }
      ++NeWS_sending;

#ifndef FLAKY_SIGPOLL
      (void) fcntl(ConnectionNumber(DISP), F_SETFL,
          fcntl(ConnectionNumber(DISP), F_GETFL, 0) & ~FASYNC);
#endif

#if ! HAVE_POLL
      FD_ZERO(&readfds);
      FD_ZERO(&writefds);
#endif

      for (;;) {

          if (terminate_flag) {
            ps_destroy();
            exit(0);
          }

#if HAVE_POLL
          for (;;) {
            retval = poll(fds, XtNumber(fds), -1);
            if (retval >= 0 || errno != EAGAIN) break;
          }
          if (retval < 0) {
            if (errno == EINTR)
                continue;
            else {
                perror("poll (xdvi NeWS_send)");
                break;
            }
          }
#else
          FD_SET(ConnectionNumber(DISP), &readfds);
          FD_SET(PostScript->file, &writefds);
          FD_SET(PostScriptInput->file, &readfds);

          if (select(numfds, &readfds, &writefds, (fd_set *) NULL,
                (struct timeval *) NULL) < 0 && errno != EINTR) {
            perror("select (xdvi NeWS_send)");
            break;
          }
#endif

          if (XDVI_ISSET(PostScriptInput->file, &readfds, 1))
            read_from_NeWS();
          if (XDVI_ISSET(PostScript->file, &writefds, 0)) {
            int   old_flags;
            int   bytes;

            old_flags = fcntl(PostScript->file, F_GETFL, 0);
            if (old_flags < 0) break;
            /* set to be non-blocking */
            if (fcntl(PostScript->file, F_SETFL, old_flags | O_NONBLOCK)
                  < 0)
                break;
            bytes = write(PostScript->file, cp, len);
            if (bytes == -1) {
                if (!AGAIN_CONDITION) perror("xdvi NeWS_send");
            }
            else {
                cp += bytes;
                len -= bytes;
            }
            if (fcntl(PostScript->file, F_SETFL, old_flags) < 0) break;
            if (len == 0 || sigpipe_error) break;
          }
          if (XDVI_ISSET(ConnectionNumber(DISP), &readfds, 2)) {
            ps_read_events(False, False);
            if (PostScript == (PSFILE *) NULL) break; /* if timeout occurred */
          }
      }

#ifndef FLAKY_SIGPOLL
      (void) fcntl(ConnectionNumber(DISP), F_SETFL,
          fcntl(ConnectionNumber(DISP), F_GETFL, 0) | FASYNC);
#endif

      if (--NeWS_sending == 0) {
          /* put back generic handler for SIGPIPE */
          (void) sigaction(SIGPIPE, &orig, (struct sigaction *) NULL);

          if (!NeWS_in_header) post_send();
      }
}

/*
 *    Wait for acknowledgement from NeWS.  With NeWS we have no choice but
 *    to wait (||| I think).
 */

static      void
waitack()
{
#if HAVE_POLL
      int   retval;
#endif
#ifndef FLAKY_SIGPOLL
      int   oldflags;
#endif

      if (PostScript == (PSFILE *) NULL) return;

#ifndef FLAKY_SIGPOLL
      oldflags = fcntl(ConnectionNumber(DISP), F_GETFL, 0);
      (void) fcntl(ConnectionNumber(DISP), F_SETFL, oldflags & ~FASYNC);
#endif
#if ! HAVE_POLL
      FD_ZERO(&readfds);
#endif
      while (NeWS_pending > 0) {
#if HAVE_POLL
          for (;;) {
            retval = poll(fds + 1, XtNumber(fds) - 1, -1);
            if (retval >= 0 || errno != EAGAIN) break;
          }
          if (retval < 0) {
            if (errno == EINTR)
                continue;
            else {
                perror("poll (xdvi NeWS_waitack)");
                break;
            }
          }
#else
          FD_SET(ConnectionNumber(DISP), &readfds);
          FD_SET(PostScriptInput->file, &readfds);
          if (select(numfds, &readfds, (fd_set *) NULL, (fd_set *) NULL,
                (struct timeval *) NULL) < 0 && errno != EINTR) {
            perror("select (xdvi NeWS_waitack)");
            break;
          }
#endif


          if (XDVI_ISSET(PostScriptInput->file, &readfds, 1))
            read_from_NeWS();
          if (XDVI_ISSET(ConnectionNumber(DISP), &readfds, 2)) {
            ps_read_events(False, False);
            if (PostScript == (PSFILE *) NULL)  /* if timeout occurred*/
                break;
          }
      }
#ifndef FLAKY_SIGPOLL
      (void) fcntl(ConnectionNumber(DISP), F_SETFL, oldflags);
#endif
}


/*---------------------------------------------------------------------------*
  initNeWS()

  Arguments: None.
  Returns: True if and only if initialization succeeded
  Side-Effects: Static variables may be set.

  Description:
  Initializes variables for the application main loop.

+----------------------------------------------------------------------------*/

Boolean
initNeWS()
{
      static      NeWStoken newstoken;

      /* now try to open the connection to the NeWS server */
      if (ps_open_PostScript() == (PSFILE *) NULL)
          return False;

#if HAVE_POLL
      fds[0].fd = PostScript->file;
      fds[1].fd = PostScriptInput->file;
      fds[2].fd = ConnectionNumber(DISP);
#else
      numfds = ConnectionNumber(DISP);
      if (numfds < PostScript->file) numfds = PostScript->file;
      if (numfds < PostScriptInput->file) numfds = PostScriptInput->file;
      ++numfds;
#endif

      psio_sigpipe_handler_struct.sa_handler = psio_sigpipe_handler;
      sigemptyset(&psio_sigpipe_handler_struct.sa_mask);

      NeWS_active = NeWS_pending_int = False;
      NeWS_sending = 0;
      NeWS_in_header = True;
      NeWS_pending = 1;

      ps_flush_PostScript();
      send(str0, sizeof(str0) - 1);
      /* get xid of window, then make this window the NeWS canvas */
      (void) ps_token_from_xid(mane.win, &newstoken);
      if (newstoken != -1) {
          ps_setcanvas(newstoken);
          ps_flush_PostScript();
          send(preamble, sizeof(preamble) - 1);
          send(psheader, psheaderlen);
          send(preamble2, sizeof(preamble2) - 1);
          NeWS_in_header = False;
          post_send();
          waitack();
      }

      if (NeWS_destroyed) return False;

      /* success */

      NeWS_mag = NeWS_shrink = -1;
      NeWS_page_w = page_w;
      NeWS_page_h = page_h;

      psp = news_procs;
      if (!postscript) toggleNeWS();      /* if we got a 'v' already */

      return True;
}


/*---------------------------------------------------------------------------*
  toggleNeWS()

  Arguments: none
  Returns: (void)
  Side-Effects: psp.drawbegin is changed

  Description:
  Used to toggle the rendering of PostScript by the NeWS server

+----------------------------------------------------------------------------*/

static      void
toggleNeWS()
{
      if (postscript) psp.drawbegin = drawbeginNeWS;
      else {
          interruptNeWS();
          psp.drawbegin = drawbegin_none;
      }
}


/*---------------------------------------------------------------------------*
  destroyNeWS()

  Arguments: none
  Returns: (void)
  Side-Effects: the pointer to the NeWS file is nulled

  Description:
  Close the connection to the NeWS server; used when rendering is terminated
  in any way.

+----------------------------------------------------------------------------*/

static      void
destroyNeWS()
{
      psp = no_ps_procs;
      NeWS_destroyed = True;
      scanned_page = scanned_page_bak = scanned_page_reset;
}


/*---------------------------------------------------------------------------*
  interruptNeWS()

  Arguments: none
  Returns: void

  Description:
  Close the connection to the NeWS server; used when rendering is terminated
  because of an interruption in the viewing of the current page.
  ||| It would be nice if we could asynchronously ``wake up'' a NeWS process
  (preferably by sending something along the X socket); then we could do
  better than just to wait.

+----------------------------------------------------------------------------*/

static      void
interruptNeWS()
{
      if (debug & DBG_PS) Puts("Running interruptNeWS()");
      if (NeWS_sending) NeWS_pending_int = True;
      else {
          if (NeWS_active) {
            send(stopstring, sizeof(stopstring) - 1);
            NeWS_active = False;
          }
          psp.interrupt = NullProc; /* prevent deep recursion in waitack */
          waitack();
          psp.interrupt = interruptNeWS;
      }
}


/*---------------------------------------------------------------------------*
  endpageNeWS()

  Arguments: none
  Returns: (void)
  Side-Effects: the NeWS_active variable is cleared.

  Description:
  Should be called at the end of a page to end this chunk for the NeWS server.

+----------------------------------------------------------------------------*/

static      void
endpageNeWS()
{
      if (debug & DBG_PS)
          Puts("endpage sent to NeWS Server");
      if (NeWS_active) {
          send(stopstring, sizeof(stopstring) - 1);
          NeWS_active = False;
          waitack();
      }
}


/*---------------------------------------------------------------------------*
  drawbeginNeWS  ()

  Arguments: xul, yul - coordinates of the upper left corner of the figure
           cp - string with the bounding box line data
  Returns: (void)

  Description:
  Opens a connection to the NeWS server and send in the preamble and the
  bounding box information after correctly computing resolution factors.
  In case no rendering is to be done, outlines the figure.  An outline is
  also generated whenever the PostScript code is too hairy and generates
  a SIGPIPE signal.

+----------------------------------------------------------------------------*/

static      void
drawbeginNeWS(xul, yul, cp)
      int         xul, yul;
      _Xconst     char  *cp;
{
      char  buf[100];
      static      _Xconst     char  str[] = " TeXDict begin\n";
      static      _Xconst     char  str2[]      = "Hinitgraphics stop\n%%xdvimark\n";

      if (debug & DBG_PS) {
          Printf("xul= %d yul= %d\n", xul, yul);
          Printf("String = < %s >\n", cp);
      }

      /* catch up on the X side */
      XSync(DISP, False);

      if (!NeWS_active) {
          /* send initialization to NeWS server */
          if (NeWS_page_w < page_w || NeWS_page_h < page_h) {
            NeWS_page_w = page_w;
            NeWS_page_h = page_h;
            send(str2, sizeof(str2) - 1);
            ++NeWS_pending;
          }
          if (magnification != NeWS_mag) {
            Sprintf(buf, "H TeXDict begin /DVImag %d 1000 div def \
end stop\n%%%%xdvimark\n",
                NeWS_mag = magnification);
            send(buf, strlen(buf));
            ++NeWS_pending;
          }
          if (mane.shrinkfactor != NeWS_shrink) {
            Sprintf(buf, "H TeXDict begin %d %d div dup \
/Resolution X /VResolution X \
end stop\n%%%%xdvimark\n",
                pixels_per_inch, NeWS_shrink = mane.shrinkfactor);
            send(buf, strlen(buf));
            ++NeWS_pending;
          }
          send(str, sizeof(str) - 1);
          NeWS_active = True;
          ++NeWS_pending;
      }

      Sprintf(buf, "%d %d moveto\n", xul, yul);
      send(buf, strlen(buf));
      send(cp, strlen(cp));
}


/*---------------------------------------------------------------------------*
  drawrawNeWS()

  Arguments: origcp - the raw string to be sent to the postscript interpreter
  Returns: (void)
  Side-Effects: (none)

  Description:
  If there is a valid connection to the NeWS server, just send the string to
  the interpreter, else leave.

+----------------------------------------------------------------------------*/

static      void
drawrawNeWS(origcp)
      _Xconst     char  *origcp;
{
      _Xconst     char  *pt, *ptm1, *ocp1;
      static      char  *cp;
      char        *cp1;
      static      unsigned int cplen = 0;
      unsigned int      len;
      double            angle;
      Boolean           found = False;

      if (!NeWS_active)
          return;

      if (debug & DBG_PS)
          Printf("Raw PS sent to context: <%s>\n", origcp);

      /* take a look at the string:  NeWS bums on certain rotations */
      len = strlen(origcp) + 4;
      if (cplen < len) {
          if (cplen != 0) free(cp);
          cplen = len;
          cp = xmalloc(cplen);
      }
      ocp1 = origcp;
      pt = origcp;
      while (*pt == ' ' || *pt == '\t') ++pt;
      cp1 = cp;
      for (;;) {
          ptm1 = pt;
          while (*pt != '\0' && *pt != ' ' && *pt != '\t') ++pt;
          if (*pt == '\0') break;
          while (*pt == ' ' || *pt == '\t') ++pt;
          if (strncmp(pt, "rotate", 6) == 0
                && (pt[6] == '\0' || pt[6] == ' ' || pt[6] == '\t')) {
            /* found rotate; check angle */
            if (sscanf(ptm1, "%lf", &angle) >= 1) {
                found = True;
                while (angle > 360.0)
                  angle -= 360;
                while (angle < -360.0)
                  angle += 360;
                if (angle == 90.0) {
                  angle = 89.999;
                  (void) memcpy(cp1, ocp1, ptm1 - ocp1);
                  cp1 += ptm1 - ocp1;
                  Strcpy(cp1, "89.999 rotate ");
                  cp1 += strlen(cp1);
                  while (*pt != '\0' && *pt != ' ' && *pt != '\t') ++pt;
                  while (*pt == ' ' || *pt == '\t') ++pt;
                  ocp1 = pt;
                } else if (angle == -90.0) {
                  angle = -89.999;
                  (void) memcpy(cp1, ocp1, ptm1 - ocp1);
                  cp1 += ptm1 - ocp1;
                  Strcpy(cp1, "-89.999 rotate ");
                  cp1 += strlen(cp1);
                  while (*pt != '\0' && *pt != ' ' && *pt != '\t') ++pt;
                  while (*pt == ' ' || *pt == '\t') ++pt;
                  ocp1 = pt;
                } else if (angle == 0.0) {
                  (void) memcpy(cp1, ocp1, ptm1 - ocp1);
                  cp1 += ptm1 - ocp1;
                  while (*pt != '\0' && *pt != ' ' && *pt != '\t') ++pt;
                  while (*pt == ' ' || *pt == '\t') ++pt;
                  ocp1 = pt;
                }
            }
          }
      }
      Strcpy(cp1, ocp1);
      if ((debug & DBG_PS) && found) {
          Printf("String is now <%s>\n", cp);
          Printf("Found rotate string.  Angle is %g degrees.\n", angle);
      }

      len = strlen(cp);
      cp[len] = '\n';
      send(cp, len + 1);
}


/*---------------------------------------------------------------------------*
  drawfileNeWS()

  Arguments: cp - string with the postscript file pathname
           psfile - file, already opened
  Returns: (void)
  Side-Effects: none

  Description:
  Postscript file containing the figure is opened and sent to the NeWS server.
  Figure is outlined in case hairy code produces a SIGPIPE signal.

+----------------------------------------------------------------------------*/

static      void
drawfileNeWS(cp, psfile)
      _Xconst     char  *cp;
      FILE        *psfile;
{
      char        buffer[1025];
      int         blen;
      struct sigaction orig;

      if (!NeWS_active) {
          Fclose(psfile);
          ++n_files_left;
          return;
      }

      if (debug & DBG_PS)
          Printf("printing file %s\n", cp);
      /* some hairy PS code generates SIGPIPE signals; handle them */
      (void) sigaction(SIGPIPE, &psio_sigpipe_handler_struct, &orig);
      sigpipe_error = False;
      NeWS_sending = 1;
      if (!sigpipe_error)
          for (;;) {
            blen = fread(buffer, sizeof(char), 1024, psfile);
            if (blen == 0) break;
            send(buffer, blen);
            if (sigpipe_error) break;
          }
      Fclose(psfile);
      ++n_files_left;

      --NeWS_sending;
      /* put back generic handler for SIGPIPE */
      (void) sigaction(SIGPIPE, &orig, (struct sigaction *) NULL);

      if (sigpipe_error) {
          Fputs("NeWS died unexpectedly.\n", stderr);
          destroyNeWS();
          draw_bbox();
      }

      if (NeWS_pending_int) {
          NeWS_pending_int = False;
          interruptNeWS();
      }
}


/*---------------------------------------------------------------------------*
  drawendNeWS()

  Arguments: cp - string with indication of the end of the special
  Returns: (void)

  Description:
  Sends the indication of end of the figure PostScript code.

+----------------------------------------------------------------------------*/

static      void
drawendNeWS(cp)
      _Xconst     char  *cp;
{
      if (!NeWS_active)
          return;

      if (debug & DBG_PS)
          Puts("drawend sent to NeWS Server");
      send(cp, strlen(cp));
      send("\n", 1);
}


/*---------------------------------------------------------------------------*
  beginheaderNeWS()

  Arguments: none
  Returns: (void)

  Description:
  Prepares the PostScript interpreter for receipt of header code.

+----------------------------------------------------------------------------*/

static      void
beginheaderNeWS()
{
      static      _Xconst     char  str[] = "Hsave /xdvi$doc exch def\n";

      if (debug & DBG_PS) Puts("Running beginheaderNeWS()");

      if (NeWS_active) {
          if (!NeWS_in_header)
            oops("Internal error in beginheaderNeWS().\n");
          return;
      }

      NeWS_in_header = True;
      if (NeWS_in_doc)
          send("H", 1);
      else {
          send(str, sizeof(str) - 1);
          NeWS_in_doc = True;
      }
      NeWS_active = True;
      ++NeWS_pending;
}


/*---------------------------------------------------------------------------*
  endheaderNeWS()

  Arguments: none
  Returns: (void)

  Description:
  Prepares the PostScript interpreter for receipt of header code.

+----------------------------------------------------------------------------*/

static      void
endheaderNeWS()
{
      static      _Xconst     char  str[] = "stop\n%%xdvimark\n";

      if (debug & DBG_PS) Puts("Running endheaderNeWS()");

      if (NeWS_active) {
          send(str, sizeof(str) - 1);
          NeWS_active = False;
          NeWS_in_header = False;
          post_send();
          waitack();
      }
}


/*---------------------------------------------------------------------------*
  newdocNeWS()

  Arguments: none
  Returns: (void)

  Description:
  Clears out headers stored from the previous document.

+----------------------------------------------------------------------------*/

static      void
newdocNeWS()
{
      static      _Xconst     char  str[] = 
                        "H xdvi$doc restore stop\n%%xdvimark\n";

      if (debug & DBG_PS) Puts("Running newdocNeWS()");

      if (NeWS_in_doc) {
          send(str, sizeof(str) - 1);
          ++NeWS_pending;
          NeWS_mag = NeWS_shrink = -1;
          NeWS_in_doc = False;
      }
}

#endif /* PS_NEWS */

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