Documentation Source Text

/*
** Compare two ETag values. Return 0 if they match and non-zero if they differ.
**
** The one on the left might be a NULL pointer and it might be quoted.
*/
static int CompareEtags(const char *zA, const char *zB){
  int lenB;
  if( zA==0 ) return 1;
  if( zA[0]=='"' ){
    int lenB = (int)strlen(zB);
    if( strncmp(zA+1, zB, lenB)==0 && zA[lenB+1]=='"' ) return 0;
  }
  return strcmp(zA, zB);
}

    /* Read and process the first line of the header returned by the
    ** CGI script.
    */
    if( useTimeout ) alarm(15);
    while( fgets(zLine,sizeof(zLine),in) && !isspace(zLine[0]) ){
      if( strncasecmp(zLine,"Location:",9)==0 ){
        int i;

        RemoveNewline(zLine);
        z = &zLine[10];
        while( isspace(*z) ){ z++; }
        for(i=0; z[i]; i++){
          if( z[i]=='?' ){
            zQuerySuffix = StrDup("");
          }
        }
        
        if( z[0]=='/' && z[1]=='/' ){
          /* The scheme is missing.  Add it in before redirecting */
          StartResponse("302 Redirect");
          nOut += printf("Location: %s:%s%s\r\n",zHttp,z,zQuerySuffix);
          continue;
        }else if( z[0]=='/' ){
          /* The scheme and network location are missing but we have
          ** an absolute path. */
          Redirect(z, 0, __LINE__); /* LOG: Redirect from CGI */
          continue;
        }
        /* Check to see if there is a scheme prefix */
        for(i=0; z[i] && z[i]!=':' && z[i]!='/'; i++){}
        if( z[i]==':' ){
          /* We have a scheme.  Assume there is an absolute URL */
          StartResponse("302 Redirect");
          nOut += printf("Location: %s%s\r\n",z,zQuerySuffix);
          continue;
        }
        /* Must be a relative pathname.  Construct the absolute pathname
        ** and redirect to it. */
        i = strlen(zRealScript);
        while( i>0 && zRealScript[i-1]!='/' ){ i--; }
        while( i>0 && zRealScript[i-1]=='/' ){ i--; }
        while( *z=='.' ){
          if( z[1]=='/' ){
            z += 2;
          }else if( z[1]=='.' && z[2]=='/' ){
            while( i>0 && zRealScript[i-1]!='/' ){ i--; }
            while( i>0 && zRealScript[i-1]=='/' ){ i--; }
            z += 3;
          }else{
            continue;
          }
        }
        StartResponse("302 Redirect");
        nOut += printf("Location: %s://%s",zHttp,zServerName);
        if( strcmp(zServerPort,"80") ){
          nOut += printf(":%s",zServerPort);
        }
        nOut += printf("%.*s/%s%s\r\n\r\n",i,zRealScript,z,zQuerySuffix);
        MakeLogEntry(0, __LINE__); /* LOG: CGI redirect */
        return;
      }else if( strncasecmp(zLine,"Status:",7)==0 ){
        int i;
        for(i=7; isspace(zLine[i]); i++){}
        nOut += printf("%s %s", zProtocol, &zLine[i]);
        strncpy(zReplyStatus, &zLine[i], 3);
        zReplyStatus[3] = 0;
        statusSent = 1;

    ** actual content file name, report that as a 404 error. */
    NotFound(__LINE__); /* LOG: Excess URI content past static file name */
  }else{
    /* If it isn't executable then it
    ** must a simple file that needs to be copied to output.
    */
    const char *zContentType = GetMimeType(zFile, lenFile);
    const char *zTag;
    char zETag[100];

    if( zTmpNam ) unlink(zTmpNam);
    sprintf(zETag, "m%xs%x", (int)statbuf.st_mtime, (int)statbuf.st_size);
    if( CompareEtags(zIfNoneMatch,zETag)==0 ){
      StartResponse("304 Not Modified");
      nOut += printf("Cache-Control: max-age=%d\r\n", mxAge);