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.

 */

/* Low-level variable management routines. */

#define VARBUF_LEN (256*1024)

#define VARBUF_NUM 16

#define VARNAME_LEN 32768

#define VARNUM_LIMIT 4096

#define vb_internal 1

#define vb_ro 2

#define vb_dirty 4

#define vb_noexport 8

#define vb_hacked 16

char *_varbuf[VARBUF_NUM]; /* main variable value buffer */

char *_varptr;

int _varbufcurr;

char *_varnamebuf, *_varnameptr; /* variable name buffer */

/* wims_ variables that should be exported */

char *exportvars[]={

      "class",

      "deposit",

      "home",

      "inssub",

      "sesdir",

      "session",

      "site_languages",

      "supervisor",

      "supervisormail",

      "tmp_debug",

      "user",

      "version",

};

#define exportvarcnt (sizeof(exportvars)/sizeof(exportvars[0]))

struct vartab {

    char *name, *val;

    unsigned short int vlen;

    char tag,lvl;

} fastvartab[128], mainvartab[VARNUM_LIMIT];

/* int vlenmin[]={0,1,20,45,100,200,400,800,1500,3000,6000}; */

int vlenmax[]={1,32,64,128, 256,512,1024,2048, 4096,8192,MAX_LINELEN+1};

int freelim[]={1,500,500,300, 200,150,100,80, 60,50,30};

#define lvlno (sizeof(vlenmax)/sizeof(vlenmax[0]))

#define freevtot (1+500+500+300 +200+150+100+80        +60+50+30)

int freevars[lvlno], freevstart[lvlno];

int freevcnt=0,bufvcnt=0;

char *freevbuf[freevtot];

int mainvarcnt=0;

void add_hack(char *name);

void get_var_privileges(void)

{

    int sav=untrust;

    untrust=0;

    var_readable=getvar("wims_readable");

    var_writable=getvar("wims_writable");

    var_nr=getvar("wims_nr");

    var_nw=getvar("wims_nw");

    var_pfx=getvar("wims_prefix");

    untrust=sav;

}

/* Returns 1 if rights OK. Else 0. */

int var_checkright(char *name, char *allow, char *deny, char *prefix)

{

    if(strcmp(name,"wims_read_parm")==0) return 1;

    if(allow!=NULL && allow[0]!=0 && wordchr(allow,name)!=NULL) return 1;

    if(deny!=NULL && deny[0]!=0 && wordchr(deny,name)!=NULL) return 0;

    if(prefix!=NULL && prefix[0]!=0) {

     char *p, buf[MAX_NAMELEN+1];

     for(p=name; *p!=0 && *p!='_'; p++);

     if(*p!='_' || p-name>=MAX_NAMELEN) return 0;

     memmove(buf,name,p-name); buf[p-name]=0;

     if(wordchr(prefix,buf)==NULL) return 0;

    }

    return 1;

}

/* initialisation */

void var_init(void)

{

    int i,j;

    memset(freevars,0,sizeof(freevars));

    _varbufcurr=0;

    _varbuf[0]=xmalloc(VARBUF_LEN);

    _varnamebuf=xmalloc(VARNAME_LEN);

    _varptr=_varbuf[0]; _varnameptr=_varnamebuf;

    for(i=j=0;i<lvlno;i++) {freevstart[i]=j; j+=freelim[i];}

    if(j!=freevtot) internal_error("var.c: wrong count freevtot!");

}

void exportall(void)

{

    int i, j, tag; char buf[MAX_NAMELEN+17];

    char *p, *p1, *p2;

    char *noexpword[1024];

    int noexplen[1024];

    int noexpcnt;

    noexpcnt=0;

    p=getvar("wims_noexport"); if(p==NULL) p="";

    for(p1=find_word_start(p),noexpcnt=0;

     *p1 && noexpcnt<1024;

     p1=find_word_start(p2)) {

     p2=find_word_end(p1);

     noexpword[noexpcnt]=p1; noexplen[noexpcnt]=p2-p1;

     noexpcnt++;

    }

    for(i=0;i<mainvarcnt;i++) {

     tag=mainvartab[i].tag;

     if((tag&vb_dirty)==0 || (tag&vb_noexport)!=0) continue;

     p=mainvartab[i].name;

     for(j=0;j<noexpcnt;j++) if(strncmp(p,noexpword[j],noexplen[j])==0) {

         mainvartab[i].tag|=vb_noexport;

         goto lend;

     }

     if(mainvartab[i].tag&vb_hacked) {

         add_hack(p); mainvartab[i].tag&=~vb_hacked;

     }

     snprintf(buf,sizeof(buf),"%s%s",var_prefix,p);

     setenv(buf,mainvartab[i].val,1);

     mainvartab[i].tag&=~vb_dirty;

lend:  ;

    }

}

char *vaskbuf(int lvl)

{

    char *p;

    if(lvl>=lvlno) {  /* should never occur */

     module_error("Internal_variable_length_overflow"); return NULL;

    }

    if(freevars[lvl]>0) {

     freevars[lvl]--; freevcnt--;

     return freevbuf[freevstart[lvl]+freevars[lvl]];

    }

    if(_varptr+vlenmax[lvl]>=_varbuf[_varbufcurr]+VARBUF_LEN) {

     if(_varbufcurr>=VARBUF_NUM) {

         module_error("variable_buffer_overflow"); return NULL;

     }

     _varbufcurr++; _varptr=_varbuf[_varbufcurr]=xmalloc(VARBUF_LEN);

    }

    bufvcnt++;

    p=_varptr; _varptr+=vlenmax[lvl]; return p;

}

/* returns 1 if free succeeded. */

int vfreebuf(int lvl, char *p)

{

    if(p>=_varptr) return 0;

    if(p+vlenmax[lvl]==_varptr) {_varptr=p; bufvcnt--;return 1;}

    if(lvl<=0 || lvl>=lvlno || freevars[lvl]>=freelim[lvl]) return 0;

    freevcnt++;

    freevbuf[freevstart[lvl]+freevars[lvl]]=p; freevars[lvl]++; return 1;

}

int _char_int(char *vn)

{

    int t; char v;

    v=vn[0]; if(vn[1]) t=64; else t=0;

    if(v>='0' && v<='9') return v-'0'+t;

    else {

     if(v>='A' && v<='Z') return v-'A'+10+t;

     else {

         if(v>='a' && v<='z') return v-'a'+10+26+t;

         else return -1;

     }

    }

}

int var_ins(char *name,int inspoint)

{

    int i, nlen, tag;

    if(mainvarcnt>=VARNUM_LIMIT) {

     module_error("too_many_variable_names"); return -1;

    }

    for(nlen=0;nlen<=MAX_NAMELEN && (myisalnum(name[nlen]) || name[nlen]=='_');nlen++);

    if(nlen<=1 || nlen>MAX_NAMELEN || name[nlen]!=0) return -1;

    if(_varnameptr+nlen+1>_varnamebuf+VARNAME_LEN) {

     module_error("variable_name_buffer_overflow"); return -1;

    }

    tag=0;

    if(search_list(ro_name,RO_NAME_NO,sizeof(ro_name[0]),name)>=0)

      tag|=vb_ro;

    if(nlen<=2 || strncmp(name,mathfont_prefix,strlen(mathfont_prefix))==0 ||

       name[nlen-1]=='_')

      tag|=vb_noexport;

    if(var_noexport) tag|=vb_noexport;

    if(name[0]=='w' && strncmp(name,wims_prefix,wpflen)==0) {

     if(search_list(exportvars,exportvarcnt,sizeof(exportvars[0]),name+wpflen)<0)

       tag|=vb_noexport;

     if(strncmp(name+wpflen,"priv_",strlen("priv_"))==0 ||

        search_list(internal_name,INTERNAL_NAME_NO,sizeof(internal_name[0]),name+wpflen)>=0)

       tag|=vb_internal;

    }

    i=inspoint; if(i>mainvarcnt) i=mainvarcnt; if(i<0) i=0;

    memmove(mainvartab+i+1,mainvartab+i,(mainvarcnt-i)*sizeof(mainvartab[0]));

    mainvarcnt++; nlen++;

    memmove(_varnameptr,name,nlen);

    mainvartab[i].name=_varnameptr; _varnameptr+=nlen;

    mainvartab[i].val=NULL; mainvartab[i].vlen=0;

    mainvartab[i].tag=tag;

    mainvartab[i].lvl=0; return i;

}

char *fast_getvar(char *vname)

{

    int n;

    n=_char_int(vname); if(n<0) return "";

    if(fastvartab[n].tag&vb_hacked) {

     add_hack(vname); fastvartab[n].tag&=~vb_hacked;

    }

    getvar_len=fastvartab[n].vlen;

    return fastvartab[n].val;

}

int _setvar_(struct vartab *vtb, char *vval)

{

    int l,lvl;

    char *p;

    if(vval) l=strlen(vval); else l=0;

    if(l>MAX_LINELEN) return 1;

    lvl=vtb->lvl;

    if(l==0) {

     if(lvl>0) {

         vfreebuf(lvl,vtb->val); vtb->tag|=vb_dirty;

         if(var_hacking) vtb->tag|=vb_hacked; else vtb->tag&=~vb_hacked;

         vtb->lvl=0; vtb->vlen=0;

     }

     if(vval) vtb->val=""; else vtb->val=NULL;

     return 0;

    }

    if(l>=vlenmax[lvl]) {

     vfreebuf(lvl,vtb->val);

     do lvl++; while(l>=vlenmax[lvl]);

     vtb->lvl=lvl;

     vtb->val=p=vaskbuf(lvl);

    }

    else p=vtb->val;

    vtb->vlen=l; vtb->tag|=vb_dirty;

    if(var_hacking) vtb->tag|=vb_hacked; else vtb->tag&=~vb_hacked;

    memmove(p,vval,++l); return 0;

}

int fast_setvar(char *vname, char *vval)

{

    int n;

    n=_char_int(vname); if(n<0) return 1;

    return _setvar_(fastvartab+n,vval);

}

/* internal constant */

int setvar_force=0;

/* Set a user variable. Now it no longer uses environment.

 * Returns 0 if OK. */

int setvar(char *vname, char *vvalue)

{

    int i,overwrite,tag;

    if(vname[0]==0) return 1;

    if((vname[1]==0 || (vname[1]=='_' && vname[2]==0)))

      return fast_setvar(vname,vvalue);

    i=search_list(mainvartab,mainvarcnt,sizeof(mainvartab[0]),vname);

    if(i<0) i=var_ins(vname,~i);

    if(i<0) return 1; /* error */

    overwrite=1; tag=mainvartab[i].tag;

    if(setvar_force==0 && confset==0) {

/* user file has no right to modify wims variables. */

     if((untrust&6)!=0) {

         if(var_checkright(vname,var_writable,var_nw,var_pfx)==0)

           return 1;

         if(strncmp(vname,wims_prefix,wpflen)==0 &&

            strcmp(vname,"wims_read_parm")!=0) return 1;

     }

     if((tag&vb_ro)!=0) overwrite=0;

     else if((tag&vb_internal)!=0 && !trusted_module()) return 1;

    }

    if(!overwrite && mainvartab[i].val!=NULL) return 1;

    _setvar_(mainvartab+i,vvalue);

    if(vname[0]=='w') {

     if(strcmp(vname,"wims_print_precision")==0) {

         int a=atoi(vvalue);

         if(a>0 && a<100) print_precision=a;

     }

     if(strcmp(vname,"wims_backslash_insmath")==0) {

         if(strcasecmp(vvalue,"yes")==0) backslash_insmath=1;

         else backslash_insmath=0;

     }

    }

    return 0;

}

int force_setvar(char *vname,char *vvalue)

{

    int i;

    setvar_force=1; i=setvar(vname,vvalue); setvar_force=0; return i;

}

void unsetvar(char *vname)

{

    int i;

    if(vname[0]!=0 && (vname[1]==0 || (vname[1]=='_' && vname[2]==0))) {

     fast_setvar(vname,NULL); return;

    }

    i=search_list(mainvartab,mainvarcnt,sizeof(mainvartab[0]),vname);

    if(i>=0) _setvar_(mainvartab+i,NULL);

}

#include "mathfonts.c"

/* Get a variable's value. */

char *_getvar(char *vname)

{

    char *val;

    int i;

    if((untrust&4)!=0 || vname[0]==0) return ""; /* called from !readdef */

    if(vname[1]==0 || (vname[1]=='_' && vname[2]==0)) return fast_getvar(vname);

    if((untrust&6)!=0) {

     if(var_checkright(vname,var_readable,var_nr,var_pfx)==0)

       return "";

    }

    i=search_list(mainvartab,mainvarcnt,sizeof(mainvartab[0]),vname);

    if(i<0) val=NULL; else {

     if(mainvartab[i].tag&vb_hacked) {

         add_hack(vname); mainvartab[i].tag&=~vb_hacked;

     }

     val=mainvartab[i].val; getvar_len=mainvartab[i].vlen;

    }

    if(vname[0]=='w' && strcmp(vname,"wims_incremental")==0) {

     static char buf[32];

     if(val==NULL) i=0;

     else i=atoi(val)+1;

     mystrncpy(buf,int2str(i),sizeof(buf));

     force_setvar(vname,buf); getvar_len=strlen(buf); val=buf;

    }

    return val;

}

char *getvar(char *vname)

{

    char *val;

    getvar_len=0; val=_getvar(vname);

    if(val==NULL && memcmp(vname,mathfont_prefix,strlen(mathfont_prefix))==0) {// mathfont_prefix m_ is add

     val=mathfont(vname);

     if(val) getvar_len=strlen(val); else getvar_len=0;

    }

    return val;

}

/* Search variables with numeric subscripts, from beg to end.

 * Store result to pbuf. Returns number of variables found. */

int varsuite(char *stem, int beg, int end, char *pbuf[], int pbuflen)

{

    int i,t,l,v;

    i=search_list(mainvartab,mainvarcnt,sizeof(mainvartab[0]),stem);

    if(i<0) i=~i;

    for(t=0,l=strlen(stem);i<mainvarcnt && t<pbuflen;i++){

     if(strncmp(mainvartab[i].name,stem,l)!=0) break;

     v=atoi(mainvartab[i].name+l); if(v<beg || v>end) continue;

     if(mainvartab[i].val==NULL || mainvartab[i].val[0]==0) continue;

     pbuf[t++]=mainvartab[i].name;

    }

    return t;

}

/* output debug information */

void debug_output(void)

{

    long int endmtime2, time1;

    struct timeval tv;

    struct rusage us;

    if(noout || robot_access || strcasecmp(tmp_debug,"yes")!=0 ||

       checkhost(manager_site)<1) return;

    if(instex_cnt>0) instex_flush();

    if(gettimeofday(&tv,NULL)) endmtime2=0;

    else endmtime2=((tv.tv_sec%1000)*1000000+tv.tv_usec);

    endmtime2=(endmtime2-startmtime2)/100;

    time1=0;

    if(getrusage(RUSAGE_SELF,&us)==0) {

     time1+=us.ru_utime.tv_sec*1000+us.ru_utime.tv_usec/1000;

     time1+=us.ru_stime.tv_sec*1000+us.ru_stime.tv_usec/1000;

    }

    if(getrusage(RUSAGE_CHILDREN,&us)==0) {

     time1+=us.ru_utime.tv_sec*1000+us.ru_utime.tv_usec/1000;

     time1+=us.ru_stime.tv_sec*1000+us.ru_stime.tv_usec/1000;

    }

    snprintf(tmplbuf,sizeof(tmplbuf),"%d,%d,%d,%.4f,%.2f,%d,%d,%d",

          (int)(_varptr-_varbuf[_varbufcurr])+_varbufcurr*VARBUF_LEN,

          bufvcnt-freevcnt,freevcnt,

          (double) endmtime2/10000, (double) time1/1000,

          mcachecnt,mfilecnt,execnt);

    setvar("wims_debug_info",tmplbuf);

    lastout_file=-1; phtml_put_base("debug.phtml",0);

}

/* Add to list of hacked variables */

void add_hack(char *name)

{

    char buf[MAX_LINELEN+1];

    char *p;

    p=getvar("wims_hacked_variables"); if(p==NULL) buf[0]=0;

    else snprintf(buf,sizeof(buf),"%s",p);

    p=buf+strlen(buf);

    if(p-buf >= sizeof(buf)-strlen(name)-4) return; /* too long */

    if(p>buf) snprintf(p,sizeof(buf)-(p-buf),", %s",name);

    else snprintf(buf,sizeof(buf),"%s",name);

    setvar("wims_hacked_variables",buf);

}