Subversion Repositories wimsdev

/*    Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis

 *

 *  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.

 */

/* Caches and its management */

#include "wimslogd.h"

struct classdata classdata[MAX_CLASSCACHE];

struct classcache {

    struct classdata *ptr;

} classcache[MAX_CLASSCACHE];

int classcaches;

struct sheetdata {

    char buffer[SHEETBUFLEN];

    int name,header,status,exocnt,exo[MAX_EXOS];

    time_t start, last;

    int access;

} sheetdata[MAX_SHEETCACHE];

struct sheetcache {

    struct sheetdata *ptr;

} sheetcache[MAX_SHEETCACHE];

int sheetcaches;

 /* searches a list. Returns index if found, -1 if nomatch.

  * Uses binary search, list must be sorted.

  */

int search_data(void *list, int items, size_t item_size, unsigned short int t)

{

    int i1,i2,j,k;

    unsigned short int *p;

    if(items<=0) return -1;

    j=0; p=list; k=*p-t;

    if(k==0) return k; if(k>0) return -1;

    p=list+(items-1)*item_size;

    k=*p-t; if(k==0) return items-1; if(k<0) return ~items;

    for(i1=0,i2=items-1;i2>i1+1;) {

        j=(i2+i1)/2;

        p=list+(j*item_size);

        k=*p-t;

        if(k==0) return j;

        if(k>0) {i2=j; continue;}

        if(k<0) {i1=j; continue;}

    }

    return ~i2;

}

/* remove old cache items */

void cleancache(void)

{

    int i;

    time_t now;

    struct classdata *cd;

    struct sheetdata *sd;

    now=time(NULL);

    for(i=0;i<classcaches;i++) {

        cd=classcache[i].ptr;

        if(now<cd->start+CLASSCACHE_DELAY) continue;

        cd->access=0;

        memmove(classcache+i,classcache+i+1,(classcaches-i-1)*sizeof(classcache[0]));

        classcaches--;

    }

    for(i=0;i<sheetcaches;i++) {

        sd=sheetcache[i].ptr;

        if(now<sd->start+SHEETCACHE_DELAY) continue;

        sd->access=0;

        memmove(sheetcache+i,sheetcache+i+1,(sheetcaches-i-1)*sizeof(sheetcache[0]));

        sheetcaches--;

    }

}

/* Locate the cache number of a class */

struct classdata *getclasscache(char *cl)

{

    int i,j,k,l,m,n, oldest;

    struct stat st;

    struct classdata *cd;

    char buf[MAX_LINELEN+1], buf2[MAX_LINELEN+1];

    char *p1, *p2, *q1, *q2;

    time_t tt;

    tt=0, oldest=0;

    for(i=0;i<classcaches;i++) {

        cd=classcache[i].ptr;

        if(tt>cd->start) {tt=cd->start; oldest=i;}

        if(strcmp(cd->name,cl)==0) {

            cd->access++;

            return cd;

        }

    }

    if(classcaches>=MAX_CLASSCACHE) {

        i=oldest;cd=classcache[i].ptr;

        cd->access=0;

        memmove(classcache+i,classcache+i+1,(classcaches-i-1)*sizeof(classcache[0]));

        classcaches--;

    }

    for(i=0;i<MAX_CLASSCACHE && classdata[i].access>0; i++);

    if(i>classcaches) return NULL;

    cd=classdata+i; cd->access=1;

    classcache[classcaches++].ptr=cd;

    snprintf(cd->name,sizeof(cd->name),"%s",cl);

    cd->start=time(NULL); cd->exocnt=0;

/* Now get the exo data */

    wlogdaccessfile(buf,"r","sheets/.require");

    for(i=k=0,p1=buf; *p1; i++,p1=p2) {

        p2=strchr(p1,'\n'); if(p2) *p2++=0; else p2=p1+strlen(p1);

        for(j=0,q1=find_word_start(p1); *q1 && k<MAX_CLASSEXOS; j++,q1=find_word_start(q2)) {

            q2=find_word_end(q1); if(*q2) *q2++=0;

            cd->exos[k].num=(i<<8)+j;cd->exos[k].require=atof(q1);

            cd->exos[k].weight=0;

            k++;

        }

    }

    if(k>=MAX_CLASSEXOS) return NULL;

    cd->exocnt=k; cd->examstart=k; cd->modif=0;

    wlogdaccessfile(buf,"r","sheets/.weight");

    for(i=k=0,p1=buf; *p1; i++,p1=p2) {

        p2=strchr(p1,'\n'); if(p2) *p2++=0; else p2=p1+strlen(p1);

        for(j=0,q1=find_word_start(p1); *q1 && k<MAX_CLASSEXOS; j++,q1=find_word_start(q2)) {

            q2=find_word_end(q1); if(*q2) *q2++=0;

            if(cd->exos[k].num==(i<<8)+j) {

                cd->exos[k].weight=atof(q1);

                k++;

            }

            else while(k<cd->exocnt && cd->exos[k].num<(i<<8)+j) k++;

        }

    }

    if(stat("exams/.exams",&st)==0) cd->modif=st.st_mtime; else return cd;

    wlogdaccessfile(buf,"r","exams/.exams");

    if(buf[0]==0) return cd;

    if(buf[0]==':') p1=buf-1; else p1=strstr(buf,"\n:");

    for(n=m=0,k=cd->exocnt; p1 && k<MAX_CLASSEXOS && m<MAX_EXOS; p1=p2,m++) {

        p1+=2;

        p2=strstr(p1,"\n:"); if(p2) *p2=0;

//      if(*find_word_start(p1)<'1') continue;  /* status */

        fnd_line(p1,3,buf2); if(buf2[0]==0) continue;

        q1=find_word_start(buf2); q2=find_word_end(q1);

        if(*q2) *q2++=0;

        q2=find_word_start(q2); *find_word_end(q2)=0;

        i=atoi(q1); j=atoi(q2); if(i<=0 || j<=0) continue;

        cd->exos[k].num=0xFF00+m;

        cd->exos[k].weight=i; cd->exos[k].require=j;    /* weight: duration. require: retries */

        fnd_line(p1,6,buf2); q1=find_word_start(buf2);

        singlespace(q1); strip_trailing_spaces(q1);

        cd->ctptr[k-cd->exocnt]=n; cd->ctbuf[n]=0;

        if(n+strlen(q1)>CTBUFLEN-MAX_EXOS-16) *q1=0;    /* silent truncation */

        l=strlen(q1)+1; memmove(cd->ctbuf+n,q1,l); n+=l;

        k++;

    }

    cd->examcnt=k-cd->exocnt; cd->exocnt=k;

    return cd;

}

// misprint ?? sheetdata ?? does not seem to be used.

/* prepare cache for a sheet */

struct sheetata *getsheetcache(char *cl, char *sh)

{

    return NULL;

}