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var.c

/*    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    2048
#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) {
      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",
           _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);
}


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