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  1. /*    Copyright (C) 2012 WIMSDEV
  2.  *    This file is part of the WIMS package.
  3.  *
  4.  *  This program is free software; you can redistribute it and/or modify
  5.  *  it under the terms of the GNU General Public License as published by
  6.  *  the Free Software Foundation; either version 2 of the License, or
  7.  *  (at your option) any later version.
  8.  *
  9.  *  This program is distributed in the hope that it will be useful,
  10.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12.  *  GNU General Public License for more details.
  13.  *
  14.  *  You should have received a copy of the GNU General Public License
  15.  *  along with this program; if not, write to the Free Software
  16.  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17.  */
  18.  
  19. int mathml(char *p, int option ){
  20.     if (strlen(p)==0) return 1 ;
  21.     if( mathalign_base <= 1){
  22.       internal_error(" why is wims trying mathml()?\n");
  23.       return 0; // go to insmath with gifs
  24.     }
  25.     if(strlen(p) > MAX_LINELEN ){ // too big ? probably too big for gifs as well ; but error signalling is better in gif-methods
  26.       mathalign_base = 1;// 0 or 1 position of tex_gifs
  27.       return 0; // go to insmath with gifs
  28.     }
  29.     //singlespace(p); // needed for check unbalanced \left\right in wims_mathml.cc --> insmath.c
  30.     singlespace(p);
  31.     int my_pipe[2];
  32.     pid_t pid;
  33.     if(pipe(my_pipe)){// pipe could not be opened...
  34.       internal_error("mathml(): pipe() failure.\n");
  35.       mathalign_base = 1;
  36.       return 0; // go to insmath with gifs
  37.     }
  38.     else
  39.     {
  40.       pid = fork();
  41.       if (pid == (pid_t) 0){
  42.           // this buffer should probably be set to 0.5 * MAX_LINELEN : mathml is very big !
  43.           // if output mathml string larger ;ERROR will be signaled by wims_matml.
  44.           char mml_buffer[MAX_LINELEN+1];
  45.           sprintf(mml_buffer, "%d", MAX_LINELEN);// int --> char
  46.           // setting --tex-size argument to wims_mathml.cc
  47.           char mathml_tex_size[64];//this should be a string like "250%"
  48.           int texsize_list[]={20,30,50,70,90,100,120,130,150,180,220,300};
  49.           // analogue to  mathfonts.c but now we talk %  and we could make any amount of changes
  50.           // not limited by font-size !!
  51.           // when math_with_gifs is removed from wims, we can rethink / improve this
  52.           int idx = 6;
  53.           int use_js_zoom = 0; // default js-zoom in mathml if disabled
  54.           // enable via adm/light
  55.           // next code is stolen from wims.c
  56.           if(getvar("useropts") != NULL || getvar("wims_useropts") != NULL){
  57.             char *u;
  58.             u = getvar("useropts"); // set via adm/light or via cookie?
  59.             if(u == NULL || *u == 0){ u=getvar("wims_useropts");} // wims_user? look into def file
  60.             if(u != NULL && *u != 0){
  61.                 if(myisdigit(u[0])){ //2 digit code : 12,22,32,...,92  [tex_size mathalignbase]
  62.                   idx = u[0] - '0';
  63.                   if(idx < 0 || idx > 11){ idx = 6; } // the default value 120%
  64.                 }
  65.                 if(myisdigit(u[2]) && u[2]!=0){ // suppose we add 0 or 1 to useropts for using js-zoom on mathml?
  66.                 // 3 digitcode:  621 == fontsize idx=6 & use mathml & use zoom
  67.                   use_js_zoom = u[2] - '0';
  68.                   if(use_js_zoom > 1 || use_js_zoom < 0){
  69.                       use_js_zoom = 0; //disable js-zooming of mathml
  70.                   }
  71.                 }
  72.             }
  73.           }
  74.           else
  75.           { // we take the default setting from adm/management config
  76.             idx = atoi(getvar("wims_texbasesize")) ;
  77.             if(idx < 0 || idx > 11){ idx = 6; } // the default value 120%
  78.           }
  79.           // check is a module wants to disable zooming (eg drag&drop or others )
  80.           // !set disable_zoom=yes
  81.           // if not set: disable_zoom="no"; see config.c
  82.           if( strcmp( getvar("disable_zoom") , "yes" ) == 0 ){
  83.             use_js_zoom = 0;
  84.           }
  85.           // now write the "char" 200% into variable "mathml_tex_size"
  86.           snprintf(mathml_tex_size,sizeof(mathml_tex_size),"%d%%",texsize_list[idx]);
  87.           // int --> char : added % sign (needed for mathml) [%% = escaped %]
  88.           if(mathml_tex_size == NULL || strlen(mathml_tex_size) == 0 ){ // this should not happen
  89.             sprintf(mathml_tex_size,"%s","120%");
  90.             // if it goes wrong we set 120%
  91.             // default in itex2MML was 110% : but we thought it was too small... ?
  92.           }
  93.           char zoom[2];
  94.           snprintf(zoom, 2 ,"%d",use_js_zoom);// int --> char : "0" or "1"
  95.           char *argv[]={"wims_mathml","--use-zoom",zoom,"--tex-size",mathml_tex_size,"--max-mml-size",mml_buffer,"--tex-string",p,NULL};
  96.           /* This is the child process. Close other end first. */
  97.           close(my_pipe[0]);
  98.           dup2(my_pipe[1], 1);  // send stdout to the pipe
  99.           dup2(my_pipe[1], 2);  // send stderr to the pipe
  100.           close(my_pipe[1]);
  101.           execv("../bin/wims_mathml",argv);
  102.           internal_error("could not execute wims_mathml\n");
  103.           mathalign_base = 1;
  104.           return 0; // go to insmath with gifs
  105.       }
  106.       else
  107.       {
  108.           if (pid < (pid_t) 0){
  109.             close(my_pipe[0]);  // close the read end of the pipe in the parent
  110.             close(my_pipe[1]);  // close the write end of the pipe in the parent
  111.             internal_error("mathml(): fork() failure.\n");
  112.             mathalign_base = 1;
  113.             return 0; // go to insmath with gifs
  114.           }
  115.           else
  116.           {
  117.             int status;
  118.             FILE *stream;
  119.             close(my_pipe[1]);  // close the write end of the pipe in the parent
  120.             stream = fdopen (my_pipe[0], "r");
  121.             char buffer[MAX_LINELEN+1];
  122.             // make buffer filled with 'zero/null'
  123.             memset(buffer,'\0',MAX_LINELEN);//bzero(buffer,maxsize);
  124.             /* read output from program line by line*/
  125.             if (option == 1) {
  126.                 *p=0;
  127.                 while ( fgets(buffer, MAX_LINELEN, stream) != NULL ){
  128.                     if(strcmp(buffer,"ERROR") != 0){
  129.                         mystrncpy(p, buffer, MAX_LINELEN-1);
  130.                     }
  131.                     else // ERROR close stream; close pipe; wait for clean exit
  132.                     {
  133.                         fclose (stream); // do not know if this is really needed... but it won't hurt ?
  134.                         close(my_pipe[0]);
  135.                         waitpid(pid, &status, 0);
  136.                         mathalign_base=1; // go to insmath with gifs
  137.                         return 0;
  138.                     }
  139.                 }
  140.             }
  141.             else // this will probably not used ? remove it ?
  142.             {
  143.                 while ( fgets(buffer, MAX_LINELEN, stream) != NULL ){
  144.                     if(strcmp(buffer,"ERROR") != 0){
  145.                         output("%s", buffer);
  146.                     }
  147.                     else
  148.                     {
  149.                         mathalign_base=1;
  150.                         return 0;
  151.                     }
  152.                 }
  153.             }
  154.             fclose (stream);
  155.             close(my_pipe[0]);
  156.             waitpid(pid, &status, 0);
  157.           }
  158.        }
  159.     }
  160.     return 1;
  161. }
  162.