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  1. /*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis
  2.  *
  3.  *  This program is free software; you can redistribute it and/or modify
  4.  *  it under the terms of the GNU General Public License as published by
  5.  *  the Free Software Foundation; either version 2 of the License, or
  6.  *  (at your option) any later version.
  7.  *
  8.  *  This program is distributed in the hope that it will be useful,
  9.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11.  *  GNU General Public License for more details.
  12.  *
  13.  *  You should have received a copy of the GNU General Public License
  14.  *  along with this program; if not, write to the Free Software
  15.  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16.  */
  17.  
  18. #include <utime.h>
  19. #include "wims.h"
  20.  
  21. /* Subroutines to process examinations */
  22.  
  23. char eparm[MAX_LINELEN+1];
  24.  
  25. void exam_parm(void)
  26. {
  27.   char *p1, *p2, *p3;
  28.   int v;
  29.   setvar("module_init_parm",eparm);
  30.   for(v=0,p1=eparm; *p1; p1=p2) {
  31.     while(*p1=='&') p1++;
  32.     p2=strchr(p1,'&');
  33.     if(p2==NULL) p2=p1+strlen(p1); else *p2++=0;
  34.     p3=strchr(p1,'='); if(p3==NULL) continue; else *p3++=0;
  35.     p1=find_word_start(p1); *find_word_end(p1)=0;
  36.     p3=find_word_start(p3); strip_trailing_spaces(p3);
  37.     user_variable[v].name=p1; user_variable[v].value=p3;
  38.     v++;
  39.   }
  40.   user_var_no=v;
  41. }
  42.  
  43. /* prepare examination situation */
  44. void check_exam(void)
  45. {
  46.   char *p, *p2, *e1, *e2, *pc=NULL;
  47.   char ps[64], pb[64], cbuf[64], dbuf[64], vbuf[MAX_FNAME+1];
  48.   int t1, t2;
  49.   int start, duration, remain;
  50.   double prime;
  51.   struct stat st;
  52.  
  53.   p=getvar(ro_name[ro_session]);
  54.   if(p==NULL || (p2=strstr(p,"_exam"))==NULL) return;
  55.   mystrncpy(pb,p,sizeof(pb)); p=pb;
  56.   p2=strstr(p,"_exam"); if(p2==NULL) return; else *p2=0;
  57.  
  58.   if(strchr(p2+1,'t')==NULL) {
  59.     e1=getvar(ro_name[ro_worksheet]);
  60.     if(e1==NULL || *e1==0) {
  61.       bad: user_error("bad_exam"); return;
  62.     }
  63.     e2=strchr(e1,'.'); if(e2==NULL) goto bad;
  64.     e2++; t1=atoi(e1); t2=atoi(e2);
  65.   }
  66.   else {
  67.     char *pt1,*pt2;
  68.     pt1=strchr(p2+1,'t'); pt2=strchr(pt1+1,'t');
  69.     *pt1++=0; *pt2++=0; t1=atoi(pt1); t2=atoi(pt2);
  70.   }
  71.   if(t1<1 || t1>99 || t2<1 || t2>99) goto bad;
  72.   snprintf(ps,sizeof(ps),"%s_examt%dt%d",p,t1,t2);
  73.   isexam=1; setsesdir(ps); force_setvar("wims_isexam","1");
  74.   force_setvar(ro_name[ro_session],ps);
  75.   /* get exam setup data */
  76.   accessfile(cbuf,"r","%s/%s/examdata.%d", session_dir,pb,t1);
  77.   if(cbuf[0]==0) goto bad;
  78.   p=find_word_start(cbuf); p2=find_word_end(p); if(*p2) *p2++=0;
  79.   duration=atoi(p)*60; if(duration==0) goto bad;
  80.   if(*p2) prime=atof(p2); else prime=0;
  81.   if (strstr(ps,parent_dir_string)!=NULL) user_error("wrong_session");
  82.   /* Whether the exercise is already done */
  83.   p=getvar(ro_name[ro_cmd]); if(p!=NULL) {
  84.     if(strcmp(p,"getins")==0 || strcmp(p,"getframe")==0) goto skipped;
  85.   }
  86.   exam_currscore(t1);
  87.   if(exam_scoredata[t2-1]!=-1000) {
  88.     snprintf(dbuf,sizeof(dbuf),"%.1f",exam_scoredata[t2-1]);
  89.     setvar("wims_exo_lastscore",dbuf);
  90.     /* Do we need to erase subsession? */
  91.     user_error("exam_exo_finished");
  92.   }
  93.   skipped:
  94.   snprintf(session_prefix,sizeof(session_prefix),"%s/%s",session_dir,ps);
  95.   snprintf(vbuf,sizeof(vbuf),"%s/var",session_prefix);
  96.   if(stat(vbuf,&st)==0) { /* exists */
  97.     unsetvar("module");
  98.     p=getvar(ro_name[ro_cmd]);
  99.     if(p==NULL) {
  100.       recmd:
  101.       force_setvar(ro_name[ro_cmd],commands[cmd_resume]);
  102.       user_var_no=0;
  103.     }
  104.     else {
  105.       int i;
  106.       for(i=0;i<CMD_NO && strcmp(p,commands[i]);i++);
  107.       if(i>=CMD_NO || i==cmd_intro || i==cmd_new || i==cmd_renew || i==cmd_hint)
  108.         goto recmd;
  109.     }
  110.   }
  111.   else { /* new */
  112.     char *pt, cbuf[MAX_FNAME+1], ebuf[MAX_FNAME+1];
  113.     char buf[2][MAX_LINELEN+1];
  114.     int w1,w2;
  115.  
  116.     force_setvar(ro_name[ro_cmd],commands[cmd_new]);
  117.     get_static_session_var();
  118.  
  119.     pc=getvar("wims_class"); if(pc==NULL) pc="";
  120.     snprintf(cbuf,sizeof(cbuf),"%s/%s",class_base,pc);
  121.     snprintf(ebuf,sizeof(ebuf),"%s/exams/.exam%d",cbuf,t1);
  122.     direct_datafile=1;
  123.     datafile_fnd_record(ebuf,t2,buf[0]);
  124.     direct_datafile=0;
  125.     if(buf[0][0]==0) goto bad;
  126.     fnd_line(buf[0],4,buf[1]);
  127.     if(buf[1][0]!=0) { /* dependencies */
  128.       if(!exam_depcheck(buf[1],t1)) {
  129.         user_error("exam_dep");
  130.       }
  131.     }
  132.     fnd_line(buf[0],2,buf[1]); if(buf[1][0]==0) goto bad;
  133.     calc_randitem(buf[1]);
  134.     pt=strchr(buf[1],'.');
  135.     if(pt==NULL) {
  136.       bad2: module_error("bad_exam_2"); return;
  137.     }
  138.     snprintf(exam_sheetexo,sizeof(exam_sheetexo),"      %s",buf[1]);
  139.     *pt++=0; w1=atoi(buf[1]); w2=atoi(pt);
  140.     if(w1<1 || w1>99 || w2<1 || w2>99) goto bad2;
  141.     snprintf(ebuf,sizeof(ebuf),"%s/sheets/.sheet%d",cbuf,w1);
  142.     direct_datafile=1;
  143.     datafile_fnd_record(ebuf,w2,buf[0]);
  144.     direct_datafile=0;
  145.     if(buf[0][0]==0) goto bad2;
  146.     fnd_line(buf[0],1,buf[1]); if(buf[1][0]==0) goto bad2;
  147.     force_setvar(ro_name[ro_module],buf[1]);
  148.     fnd_line(buf[0],2,eparm); /* if(eparm[0]==0) goto bad2; */
  149.     exam_parm();
  150.   }
  151.   /* Register start time */
  152.   snprintf(vbuf,sizeof(vbuf),"%s/%s/examreg.%d",
  153.         session_dir,pb,t1);
  154.   if(stat(vbuf,&st)==0) { /* reg exists */
  155.     char tbuf[MAX_LINELEN+1];
  156.     struct utimbuf ut;
  157.     accessfile(tbuf,"r",vbuf); start=atoi(tbuf);
  158.     if(start<=nowtime-duration) {
  159.       user_error("expired_exam"); return;
  160.     }
  161.     /* refresh session times */
  162.     ut.actime=ut.modtime=nowtime;
  163.     utime(mkfname(NULL,"%s/%s",session_dir,pb),&ut);
  164.   }
  165.   else { /* First time call: register starting time */
  166.     char *pu, *p1, tbuf[MAX_LINELEN+1];
  167.     snprintf(dbuf,sizeof(dbuf),"%u",(unsigned int) nowtime);
  168.     accessfile(dbuf,"w","%s",vbuf); start=nowtime;
  169.     if(pc==NULL) pc=getvar("wims_class");
  170.     if(pc==NULL) pc="";
  171.     pu=getvar("wims_user"); if(pu==NULL) pu="";
  172.     snprintf(vbuf,sizeof(vbuf),"%s/%s/.parmreg", class_base, pc);
  173.     mkdirs(vbuf);
  174.     snprintf(vbuf,sizeof(vbuf),"%s/%s/.parmreg/%s.exam",
  175.          class_base, pc, pu);
  176.     p1=remote_addr;
  177.     snprintf(dbuf,sizeof(dbuf),"%s %s %u %d",
  178.          p1, pb, (unsigned int) start+duration, t1);
  179.     accessfile(dbuf,"w","%s",vbuf);
  180.     accessfile(tbuf,"r","%s/%s/.E%d",class_base,pc,t1);
  181.     if(strchr(tbuf,'#')==NULL && strcmp(pu,"supervisor")!=0) {  /* not for simulation */
  182.       snprintf(tbuf,sizeof(tbuf),"%d 00 %d %u %s %s %s\n",
  183.              t1, duration/60, (unsigned int) start,p1,pb,
  184.              nowstr);
  185.       if(prime!=0) {
  186.         int n=strlen(tbuf);
  187.           snprintf(tbuf+n,sizeof(tbuf)-n,"%d %.2f -1 %u %s %s\n",
  188.                 t1,prime,(unsigned int) start,p1,pb);
  189.       }
  190.       accessfile(tbuf,"a","%s/%s/score/%s.exam",
  191.                  class_base,pc,pu);
  192.     }
  193.     else accessfile("yes","w","%s/%s/examsimu.%d",
  194.           session_dir,pb,t1);
  195.   }
  196.   remain=duration+start-nowtime; if(remain<0) remain=0;
  197.   snprintf(dbuf,sizeof(dbuf),"%d",remain);
  198.   setvar("wims_exam_remain",dbuf); /* remaining time in seconds */
  199.   if(pc==NULL) pc=getvar("wims_class");
  200.   if(pc) getscorestatus(pc,t1);  /* set up wims_scoring */
  201. }
  202.  
  203. double currexamscore(int sh)
  204. {
  205.   char buf[MAX_FNAME+1], sbuf[MAX_LINELEN+1];
  206.   char *p, *p1, *cl;
  207.   int i, excnt;
  208.   double sc, w, ww, prime;
  209.  
  210.   cl=getvar("wims_class"); if(cl==NULL || *cl==0) return 0;
  211.   mystrncpy(sbuf,session_prefix,sizeof(sbuf));
  212.   p=strstr(sbuf,"_exam"); if(p) *p=0;
  213.   accessfile(buf,"r","%s/examdata.%d",sbuf,sh);
  214.   p=find_word_start(find_word_end(find_word_start(buf)));
  215.   if(*p) prime=atof(p); else prime=0;
  216.   exam_currscore(sh);
  217.   snprintf(buf,sizeof(buf),"%s/%s/exams/.exam%d",class_base,cl,sh);
  218.   direct_datafile=1;
  219.   excnt=datafile_recordnum(buf);
  220.   w=sc=0;
  221.   for(i=0;i<excnt;i++) {
  222.     sbuf[0]=0; datafile_fnd_record(buf,i+1,sbuf);
  223.     p1=find_word_start(sbuf); *find_word_end(p1)=0;
  224.     ww=atof(p1); if(ww<=0) continue;
  225.     w+=ww; if(exam_scoredata[i]>-1000) sc+=exam_scoredata[i]*ww;
  226.   }
  227.   direct_datafile=0; if(sc<0) sc=0;
  228.   if(w==0) return 0; else return (1-prime/10)*sc/w+prime;
  229. }
  230.  
  231. void calc_examdep(char *p)
  232. {
  233.   char *p1, *p2;
  234.   int t;
  235.   if(!trusted_module()) {abt: *p=0; return;}
  236.   p1=find_word_start(p); p2=find_word_end(p1);
  237.   if(*p2==0) goto abt;
  238.   *p2++=0; p2=find_word_start(p2);
  239.   t=atoi(p1);
  240.   snprintf(p,MAX_LINELEN, exam_depcheck(p2,t)? "yes" : "no");
  241. }
  242.