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html2msg.c

/*    Copyright (C) 1998 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.
 */

      /* Check type of a file */

/*************** Customization: change values hereafter ****************/

      /* limit of data buffers */
#define buflim 1024*1024*16

/***************** Nothing should need change hereafter *****************/

#include "../wims.h"
#include "../hmname.c"

char fn1[1024]="", fn2[1024]="";
char mathbuf[MAX_LINELEN+1];
char *filebuf;
int filelen=0;
int latex2html=0;
FILE *outf;

struct {
    char *name, *trans;
} backtrans[]={
    {"\\ge\\",          " >= "},
    {"\\geq\\",         " >= "},
    {"\\le\\",          " <= "},
    {"\\leq\\",         " <= "},
    {"\\to\\",          " -> "},
    {"\\rightarrow\\",  " -> "},
    {"\\longrightarrow\\", " --> "},
    {"\\Rightarrow\\",  " => "},
    {"\\Longrightarrow\\", " ==> "},
    {"\\Leftrightarrow\\", " <=> "},
    {"\\Longleftrightarrow\\", " <==> "},
    {"\\Longleftarrow\\", " <== "},
};

#define backtransno (sizeof(backtrans)/sizeof(backtrans[0]))

void *xmalloc(size_t n)
{
    void *p;
    p=malloc(n);
    if(p==NULL) exit(1);
    return p;
}

      /* Points to the end of the word */
char *find_word_end(char *p)
{
    int i;
    for(i=0;!isspace(*p) && *p!=0 && i<MAX_LINELEN; p++,i++);
    return p;
}

      /* Strips leading spaces */
char *find_word_start(char *p)
{
    int i;
    for(i=0; isspace(*p) && i<MAX_LINELEN; p++,i++);
    return p;
}

char *find_tag_end(char *p)
{
    char *pp, *old;
    pp=p; if(*pp=='<') pp++;
    for(; *pp && *pp!='>'; pp++) {
      if(*pp=='"') {
          pp=strchr(pp+1,'"');
          if(pp==NULL) {pp=p+strlen(p); break;} else continue;
      }
    }
      /* this is probably an syntax error of the page */
    if(*pp==0 && pp>p+2048) {
      old=p; if(*old=='<') old++;
      pp=strchr(old,'>');
      if(pp==NULL) pp=strchr(old,'<');
      if(pp==NULL) pp=find_word_end(find_word_start(old));
    }
    if(*pp=='>') pp++; return pp;
}

char *find_tag(char *p, char *tag)
{
    char *pp;
    int len;
    len=strlen(tag);
    for(pp=strchr(p,'<'); pp!=NULL && *pp; pp=strchr(pp+1,'<')) {
      if(strncasecmp(pp+1,tag,len)==0 && !isalnum(*(pp+1+len))) return pp;
    }
    return p+strlen(p);
}

      /* modify a string. Bufferlen must be ast least MAX_LINELEN */
void string_modify(char *start, char *bad_beg, char *bad_end, char *good,...)
{
    char buf[MAX_LINELEN+1];
    va_list vp;
    
    va_start(vp,good);
    vsnprintf(buf,sizeof(buf),good,vp); va_end(vp);
    if(strlen(start)-(bad_end-bad_beg)+strlen(buf)>=MAX_LINELEN) {
      return;
    }
    strcat(buf,bad_end);
    strcpy(bad_beg,buf);
}

void cutamp(char *p)
{
    char *pp;
    for(pp=strchr(p,'&'); pp; pp=strchr(pp+1,'&')) {
      if(strncmp(pp,"&amp;",5)==0) {
          strcpy(pp+1,pp+5); continue;
      }
      if(strncmp(pp,"&lt;",4)==0) {
          *pp='<'; strcpy(pp+1,pp+4); continue;
      }
      if(strncmp(pp,"&gt;",4)==0) {
          *pp='>'; strcpy(pp+1,pp+4); continue;
      }
      
    }
}

      /* get the file */
void prepare_file(void)
{
    FILE *f;
    long int flen;

    filelen=0;
    f=fopen(fn1,"r"); if(f==NULL) return;
    fseek(f,0,SEEK_END);flen=ftell(f); fseek(f,0,SEEK_SET);
    if(flen>buflim) return;
    filebuf=xmalloc(2*flen+1024);flen=fread(filebuf,1,flen,f);
    fclose(f);
    if(flen<0 || flen>=buflim) flen=0; filebuf[flen]=0;
    filelen=flen;
    outf=fopen(fn2,"w"); if(outf==NULL) return;
}

void getmath(char *p)
{
    char *pt, *pv;
    char *p1, *p2, buf[256];

    mathbuf[0]=0;
    pt=find_word_start(p);
    if(strncmp(pt,"\\begin{displaymath}",
               strlen("\\begin{displaymath}"))==0) {
      pt=strchr(pt,'}')+1;
      pv=strstr(pt,"\\end{displaymath}");
      if(pv==NULL) return;
      goto insmath;
    }
    if(*pt=='%') pt=strchr(pt,'$'); if(pt==NULL) return;
    if(*pt!='$') return; do pt++; while(*pt=='$');
    pv=strchr(pt,'$'); if(pv==NULL) return;
    insmath: if(pv-pt>=MAX_LINELEN-256) return;
    memmove(mathbuf,pt,pv-pt); mathbuf[pv-pt]=0;
    if(strstr(mathbuf,"...\n...")!=NULL) {
      strcpy(mathbuf,"......"); return;
    }
    cutamp(mathbuf); latex2html=1;
    for(p1=strstr(mathbuf,"\\mathbb");p1;p1=strstr(p1+1,"\\mathbb")) {
      char c,*d;
      p2=find_word_start(p1+strlen("\\mathbb")); c=0;
      if(strchr("NZQRC",*p2)!=NULL) c=*p2;
      else if(*p2=='{' && *(p2+2)=='}' && strchr("NZQRC",*(p2+1))!=NULL) {
            c=*(p2+1); p2+=2;
      }
      if(c) {
          p2=find_word_start(++p2);
          if(isalnum(*p2)) d=" "; else d="";
          string_modify(mathbuf,p1,p2,"\\%c%c%s",c,c,d);
      }
    }
    for(p1=strstr(mathbuf,"{\\"); p1; p1=strstr(p1+1,"{\\")) {
      if(p1>mathbuf && isalpha(*(p1-1))) continue;
      for(p2=p1+2; p2<p1+24 && isalpha(*p2); p2++);
      if(*p2!='}' || isalnum(*(p2+1))) continue;
      memmove(buf,p1+1,p2-p1-1); buf[p2-p1-1]='\\'; buf[p2-p1]=0;
      if(strstr(hmsame,buf)==NULL) continue;
      strcpy(p2,p2+1); strcpy(p1,p1+1);
    }
    if(strstr(mathbuf,"\\begin{")!=NULL) return;
    for(p1=strchr(mathbuf,'{'); p1; p1=strchr(p1+1,'{')) {
      if((p1>mathbuf && isalpha(*(p1-1))) ||
         !isalnum(*(p1+1)) || *(p1+2)!='}') continue;
      *p1=*(p1+1); strcpy(p1+1,p1+3);
    }
    if(strchr(mathbuf,'[')!=NULL) {
        char mbuf[MAX_LINELEN+1];
      snprintf(mbuf,sizeof(mbuf),"{%s}",mathbuf);
      strcpy(mathbuf,mbuf);
    }
      /* try to simplify */
    if(strchr(mathbuf,'{')==NULL && strchr(mathbuf,'\\')!=NULL) {
      int i, tt;
      tt=0;
      for(p1=strchr(mathbuf,'\\'); p1; p1=strchr(p1+1,'\\')) {
          for(p2=p1+1;isalpha(*p2);p2++);
          if(p2==p1+1 || p2>p1+24) {tt=1; break;}
          memmove(buf,p1,p2-p1);buf[p2-p1]='\\';buf[p2-p1+1]=0;
          for(i=0;i<backtransno && strcmp(buf,backtrans[i].name)!=0;i++);
          if(i>=backtransno && strstr(hmsame,buf)==NULL) {
            tt=1; break;
          }
      }
      if(tt==0) {
          for(p1=strchr(mathbuf,'\\'); p1; p1=strchr(p1+1,'\\')) {
            for(p2=p1+1;isalpha(*p2);p2++);
            if(p2==p1+1 || p2>p1+24) break;
            memmove(buf,p1,p2-p1);buf[p2-p1]='\\';buf[p2-p1+1]=0;
            for(i=0;i<backtransno && strcmp(buf,backtrans[i].name)!=0;i++);
            if(i<backtransno) 
              string_modify(buf,p1,p2,backtrans[i].trans);
            else *p1=' ';
          }
      }
    }
}

void output(void)
{
    char *p, *pp, *p2, *pt;
    char buf[MAX_LINELEN+1];
    p=filebuf;
    restart:
    pp=find_tag(p,"body"); if(*pp!=0) {
      p=find_tag_end(pp); goto restart;
    }
    pp=find_tag(p,"html"); if(*pp!=0) {
      p=find_tag_end(pp); goto restart;
    }
    *find_tag(p,"/body")=0; *find_tag(p,"/html")=0;
    for(pp=strstr(p,"\n\n"); pp; pp=strstr(pp+1,"\n\n")) *pp=' ';
    for(pp=strchr(p,'<');pp!=NULL;pp=strchr(find_tag_end(pp),'<')) {
      if(pp>p) {fwrite(p,1,pp-p,outf); p=pp;}
      if(latex2html && strncasecmp(pp,"<br><hr>",8)==0 &&
         *find_word_start(pp+8)==0) break;
      if(strncasecmp(pp+1,"!-- MATH",8)==0) {
          p2=strstr(pp+8,"-->"); if(p2==NULL) continue;
          *p2=0; getmath(pp+9); *p2='-';
          p=p2+3; pt=find_word_start(p);
          if(mathbuf[0] && strncasecmp(pt,"<IMG",4)==0 && isspace(*(pt+4))) {
            p=find_tag_end(pt); pp=pt;
            fprintf(outf,"\\(%s\\)",mathbuf);
          }
          continue;
      }
      if(strncasecmp(pp+1,"a",1)==0 && isspace(*(pp+2))) {

          
          
          continue;
      }
      if(strncasecmp(pp+1,"img",3)==0 && isspace(*(pp+4))) {
          p2=find_tag_end(pp);
          if(p2-pp>=MAX_LINELEN-256) continue;
          memmove(buf,pp+1,p2-pp-2); buf[p2-pp-2]=0;
          pt=strstr(buf,"ALT=\""); if(pt==NULL) pt=strstr(buf,"alt=\"");
          if(pt!=NULL) {
            pt+=strlen("ALT=\"");
            getmath(pt); if(mathbuf[0]) {
                fprintf(outf,"\\(%s\\)",mathbuf); p=p2;
            }
          }
      }
    }
    if(pp==NULL) fprintf(outf,"%s",p);
}

int main(int argc, char *argv[])
{
    char *p, *pp;
    char *mod;

    mod=getenv("w_module");
    if(mod!=NULL && strncmp(mod,"adm/",4)!=0 && strcmp(mod,"home")!=0) return 1;
    if(mod==NULL) p=argv[1]; else p=getenv("wims_exec_parm");
    if(p==NULL || *p==0) return 1;
    p=find_word_start(p); pp=find_word_end(p);
    if(pp<=p || pp-p>sizeof(fn1)-1) return 1;
    memmove(fn1,p,pp-p); fn1[pp-p]=0;
    p=find_word_start(pp); pp=find_word_end(p);
    if(pp<=p || pp-p>sizeof(fn2)-1) strcpy(fn2,fn1); 
    else {memmove(fn2,p,pp-p); fn2[pp-p]=0;}
    prepare_file();
    output();
    fclose(outf);
    return 0;
}


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