Subversion Repositories wimsdev

/*    Copyright (C) 2012 WIMSDEV

 *    This file is part of the WIMS package.

 *

 *  This program 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 of the License, or

 *  (at your option) any later version.

 *

 *  This program 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 this program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include "wims.h"

int disable_mathml;

int mathml(char *p, int option ){

    if (strlen(p)==0) return 1 ;

    if( mathalign_base <= 1){

      internal_error(" why is wims trying mathml()?\n");

      return 0; // go to insmath with gifs

    }

    if( disable_mathml==1 || atoi(getvar("disable_mathml"))==1) return 0;

    if(strlen(p) > MAX_LINELEN ){ // too big ? probably too big for gifs as well ; but error signalling is better in gif-methods

      mathalign_base = 1;// 0 or 1 position of tex_gifs

      return 0; // go to insmath with gifs

    }

    //singlespace(p); // needed for check unbalanced \left\right in wims_mathml.cc --> insmath.c

    singlespace(p);

    int my_pipe[2];

    pid_t pid;

    if(pipe(my_pipe)){// pipe could not be opened...

      internal_error("mathml(): pipe() failure.\n");

      mathalign_base = 1;

      return 0; // go to insmath with gifs

    }

    else

    {

      pid = fork();

      if (pid == (pid_t) 0){

          // this buffer should probably be set to 0.5 * MAX_LINELEN : mathml is very big !

          // if output mathml string larger ;ERROR will be signaled by wims_mathml.

          char mml_buffer[MAX_LINELEN+1];

          sprintf(mml_buffer, "%d", MAX_LINELEN);// int --> char

          // setting --tex-size argument to wims_mathml.cc

          char mathml_tex_size[64];//this should be a string like "250%"

          int texsize_list[]={20,30,50,70,90,100,120,130,150,180,220,300};

          // analogue to  mathfonts.c but now we talk %  and we could make any amount of changes

          // not limited by font-size !!

          // when math_with_gifs is removed from wims, we can rethink / improve this

          int idx = 6;

          int use_js_zoom = 0; // default js-zoom in mathml if disabled

          // enable via adm/light

          // next code is stolen from wims.c

          if(getvar("useropts") != NULL || getvar("wims_useropts") != NULL){

            char *u;

            u = getvar("useropts"); // set via adm/light or via cookie?

            if(u == NULL || *u == 0){ u=getvar("wims_useropts");} // wims_user? look into def file

            if(u != NULL && *u != 0){

                if(myisdigit(u[0])){ //2 digit code : 12,22,32,...,92  [tex_size mathalignbase]

                  idx = u[0] - '0';

                  if(idx < 0 || idx > 11){ idx = 6; } // the default value 120%

                }

                if(myisdigit(u[2]) && u[2]!=0){ // suppose we add 0 or 1 to useropts for using js-zoom on mathml?

                // 3 digitcode:  621 == fontsize idx=6 & use mathml & use zoom

                  use_js_zoom = u[2] - '0';

                  if(use_js_zoom > 1 || use_js_zoom < 0){

                      use_js_zoom = 0; //disable js-zooming of mathml

                  }

                }

            }

          }

          else

          { // we take the default setting from adm/management config

            idx = atoi(getvar("wims_texbasesize")) ;

            if(idx < 0 || idx > 11){ idx = 6; } // the default value 120%

          }

          // check is a module wants to disable zooming (eg drag&drop or others )

          // !set disable_zoom=yes

          // if not set: disable_zoom="no"; see config.c

          if( strcmp( getvar("disable_zoom") , "yes" ) == 0 ){

             use_js_zoom = 0;

          }

          // now write the "char" 200% into variable "mathml_tex_size"

          snprintf(mathml_tex_size,sizeof(mathml_tex_size),"%d%%",texsize_list[idx]);

          // int --> char : added % sign (needed for mathml) [%% = escaped %]

          if(strlen(mathml_tex_size) == 0 ){ // this should not happen

            sprintf(mathml_tex_size,"%s","120%");

            // if it goes wrong we set 120%

            // default in itex2MML was 110% : but we thought it was too small... ?

          }

          char zoom[2];

          snprintf(zoom, 2 ,"%d",use_js_zoom);// int --> char : "0" or "1"

          char *argv[]={"wims_mathml","--use-zoom",zoom,"--tex-size",mathml_tex_size,"--max-mml-size",mml_buffer,"--tex-string",p,NULL};

/* This is the child process. Close other end first. */

          close(my_pipe[0]);

          dup2(my_pipe[1], 1);  // send stdout to the pipe

          dup2(my_pipe[1], 2);  // send stderr to the pipe

          close(my_pipe[1]);

          execv("../bin/wims_mathml",argv);

          internal_error("could not execute wims_mathml\n");

          mathalign_base = 1;

          return 0; // go to insmath with gifs

      }

      else

      {

          if (pid < (pid_t) 0){

            close(my_pipe[0]);  // close the read end of the pipe in the parent

            close(my_pipe[1]);  // close the write end of the pipe in the parent

            internal_error("mathml(): fork() failure.\n");

            mathalign_base = 1;

            return 0; // go to insmath with gifs

          }

          else

          {

             int status;

            FILE *stream;

            close(my_pipe[1]);  // close the write end of the pipe in the parent

            stream = fdopen (my_pipe[0], "r");

            char buffer[MAX_LINELEN+1];

            // make buffer filled with 'zero/null'

            memset(buffer,'\0',MAX_LINELEN);//bzero(buffer,maxsize);

/* read output from program line by line */

            if (option == 1) {

                *p=0;

                while ( fgets(buffer, MAX_LINELEN, stream) != NULL ){

                     if(strcmp(buffer,"ERROR") != 0){

                      mystrncpy(p, buffer, MAX_LINELEN-1);

                     }

                    else /* ERROR close stream; close pipe; wait for clean exit */

                    {

                  fclose (stream); /* do not know if this is really needed... but it won't hurt ? */

                  close(my_pipe[0]);

                  waitpid(pid, &status, 0);

                     mathalign_base=1; /* go to insmath with gifs */

                     return 0;

                    }

                }

            }

            else /* this will probably not used ? remove it ? */

            {

             while ( fgets(buffer, MAX_LINELEN, stream) != NULL ){

                 if(strcmp(buffer,"ERROR") != 0){

                  output("%s", buffer);

                 }

                    else

                    {

                     mathalign_base=1;

                     return 0;

                    }

                }

            }

            fclose (stream);

            close(my_pipe[0]);

            waitpid(pid, &status, 0);

          }

       }

    }

    return 1;

}