params.c

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   *                    would have been read by Parse().  Unlike a comment
   *                    line or a section header, there is no lead-in
   *                    character that can be discarded.
   *
   *  Output: true if the parameter name and value were scanned and processed
   *          successfully, else false.
   *
   *  Notes:  This function is in two parts.  The first loop scans the
   *          parameter name.  Internal whitespace is compressed, and an
   *          equal sign (=) terminates the token.  Leading and trailing
   *          whitespace is discarded.  The second loop scans the parameter
   *          value.  When both have been successfully identified, they are
   *          passed to pfunc() for processing.
   *
   * ------------------------------------------------------------------------ **
   */
  {
  int   i       = 0;    /* Position within bufr. */
  int   end     = 0;    /* bufr[end] is current end-of-string. */
  int   vstart  = 0;    /* Starting position of the parameter value. */
  const char *func    = "params.c:Parameter() -";

  /* Read the parameter name. */
  while( 0 == vstart )  /* Loop until we've found the start of the value. */
    {

    if( i > (InFile->bSize - 2) )       /* Ensure there's space for next char.    */
      {
      char *tb;
      
      tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC );
      if( NULL == tb )
        {
        DEBUG(0, ("%s Memory re-allocation failure.", func) );
        return( false );
        }
      InFile->bufr = tb;
      InFile->bSize += BUFR_INC;
      }

    switch( c )
      {
      case '=':                 /* Equal sign marks end of param name. */
        if( 0 == end )              /* Don't allow an empty name.      */
          {
          DEBUG(0, ("%s Invalid parameter name in config. file.\n", func ));
          return( false );
          }
        InFile->bufr[end++] = '\0';         /* Mark end of string & advance.   */
        i       = end;              /* New string starts here.         */
        vstart  = end;              /* New string is parameter value.  */
        InFile->bufr[i] = '\0';             /* New string is nul, for now.     */
        break;

      case '\n':                /* Find continuation char, else error. */
        i = Continuation( InFile->bufr, i );
        if( i < 0 )
          {
          InFile->bufr[end] = '\0';
          DEBUG(1,("%s Ignoring badly formed line in configuration file: %s\n",
                   func, InFile->bufr ));
          return( true );
          }
        end = ( (i > 0) && (' ' == InFile->bufr[i - 1]) ) ? (i - 1) : (i);
        c = mygetc( InFile );       /* Read past eoln.                   */
        break;

      case '\0':                /* Shouldn't have EOF within param name. */
      case EOF:
        InFile->bufr[i] = '\0';
        DEBUG(1,("%s Unexpected end-of-file at: %s\n", func, InFile->bufr ));
        return( true );

      default:
        if( isspace( c ) )     /* One ' ' per whitespace region.       */
          {
          InFile->bufr[end] = ' ';
          i = end + 1;
          c = EatWhitespace( InFile );
          }
        else                   /* All others verbatim.                 */
          {
          InFile->bufr[i++] = c;
          end = i;
          c = mygetc( InFile );
          }
      }
    }

  /* Now parse the value. */
  c = EatWhitespace( InFile );  /* Again, trim leading whitespace. */
  while( (EOF !=c) && (c > 0) )
    {

    if( i > (InFile->bSize - 2) )       /* Make sure there's enough room. */
      {
      char *tb;
      
      tb = talloc_realloc(InFile, InFile->bufr, char, InFile->bSize + BUFR_INC );
      if( NULL == tb )
        {
        DEBUG(0, ("%s Memory re-allocation failure.", func) );
        return( false );
        }
      InFile->bufr = tb;
      InFile->bSize += BUFR_INC;
      }

    switch( c )
      {
      case '\r':              /* Explicitly remove '\r' because the older */
        c = mygetc( InFile );   /* version called fgets_slash() which also  */
        break;                /* removes them.                            */

      case '\n':              /* Marks end of value unless there's a '\'. */
        i = Continuation( InFile->bufr, i );
        if( i < 0 )
          c = 0;
        else
          {
          for( end = i; (end >= 0) && isspace((int)InFile->bufr[end]); end-- )
            ;
          c = mygetc( InFile );
          }
        break;

      default:               /* All others verbatim.  Note that spaces do */
        InFile->bufr[i++] = c;       /* not advance <end>.  This allows trimming  */
        if( !isspace( c ) )  /* of whitespace at the end of the line.     */
          end = i;
        c = mygetc( InFile );
        break;
      }
    }
  InFile->bufr[end] = '\0';          /* End of value. */

  return( pfunc( InFile->bufr, &InFile->bufr[vstart], userdata ) );   /* Pass name & value to pfunc().  */
  } /* Parameter */

static bool Parse( myFILE *InFile,
                   bool (*sfunc)(const char *, void *),
                   bool (*pfunc)(const char *, const char *, void *),
				   void *userdata )
  /* ------------------------------------------------------------------------ **
   * Scan & parse the input.
   *
   *  Input:  InFile  - Input source.
   *          sfunc   - Function to be called when a section name is scanned.
   *                    See Section().
   *          pfunc   - Function to be called when a parameter is scanned.
   *                    See Parameter().
   *
   *  Output: true if the file was successfully scanned, else false.
   *
   *  Notes:  The input can be viewed in terms of 'lines'.  There are four
   *          types of lines:
   *            Blank      - May contain whitespace, otherwise empty.
   *            Comment    - First non-whitespace character is a ';' or '#'.
   *                         The remainder of the line is ignored.
   *            Section    - First non-whitespace character is a '['.
   *            Parameter  - The default case.
   * 
   * ------------------------------------------------------------------------ **
   */
  {
  int    c;

  c = EatWhitespace( InFile );
  while( (EOF != c) && (c > 0) )
    {
    switch( c )
      {
      case '\n':                        /* Blank line. */
        c = EatWhitespace( InFile );
        break;

      case ';':                         /* Comment line. */
      case '#':
        c = EatComment( InFile );
        break;

      case '[':                         /* Section Header. */
        if( !Section( InFile, sfunc, userdata ) )
          return( false );
        c = EatWhitespace( InFile );
        break;

      case '\\':                        /* Bogus backslash. */
        c = EatWhitespace( InFile );
        break;

      default:                          /* Parameter line. */
        if( !Parameter( InFile, pfunc, c, userdata ) )
          return( false );
        c = EatWhitespace( InFile );
        break;
      }
    }
  return( true );
  } /* Parse */

static myFILE *OpenConfFile( const char *FileName )
  /* ------------------------------------------------------------------------ **
   * Open a configuration file.
   *
   *  Input:  FileName  - The pathname of the config file to be opened.
   *
   *  Output: A pointer of type (char **) to the lines of the file
   *
   * ------------------------------------------------------------------------ **
   */
  {
  const char *func = "params.c:OpenConfFile() -";
  myFILE *ret;

  ret = talloc(talloc_autofree_context(), myFILE);
  if (!ret) return NULL;

  ret->buf = file_load(FileName, &ret->size, ret);
  if( NULL == ret->buf )
    {
    DEBUG( 1,
      ("%s Unable to open configuration file \"%s\":\n\t%s\n",
      func, FileName, strerror(errno)) );
    talloc_free(ret);
    return NULL;
    }

  ret->p = ret->buf;
  ret->bufr = NULL;
  ret->bSize = 0;
  return( ret );
  } /* OpenConfFile */

bool pm_process( const char *FileName,
                 bool (*sfunc)(const char *, void *),
                 bool (*pfunc)(const char *, const char *, void *),
				 void *userdata)
  /* ------------------------------------------------------------------------ **
   * Process the named parameter file.
   *
   *  Input:  FileName  - The pathname of the parameter file to be opened.
   *          sfunc     - A pointer to a function that will be called when
   *                      a section name is discovered.
   *          pfunc     - A pointer to a function that will be called when
   *                      a parameter name and value are discovered.
   *
   *  Output: TRUE if the file was successfully parsed, else FALSE.
   *
   * ------------------------------------------------------------------------ **
   */
  {
  int   result;
  myFILE *InFile;
  const char *func = "params.c:pm_process() -";

  InFile = OpenConfFile( FileName );          /* Open the config file. */
  if( NULL == InFile )
    return( false );

  DEBUG( 3, ("%s Processing configuration file \"%s\"\n", func, FileName) );

  if( NULL != InFile->bufr )                          /* If we already have a buffer */
    result = Parse( InFile, sfunc, pfunc, userdata );   /* (recursive call), then just */
                                              /* use it.                     */

  else                                        /* If we don't have a buffer   */
    {                                         /* allocate one, then parse,   */
    InFile->bSize = BUFR_INC;                         /* then free.                  */
    InFile->bufr = talloc_array(InFile, char, InFile->bSize );
    if( NULL == InFile->bufr )
      {
      DEBUG(0,("%s memory allocation failure.\n", func));
      myfile_close(InFile);
      return( false );
      }
    result = Parse( InFile, sfunc, pfunc, userdata );
    InFile->bufr  = NULL;
    InFile->bSize = 0;
    }

  myfile_close(InFile);

  if( !result )                               /* Generic failure. */
    {
    DEBUG(0,("%s Failed.  Error returned from params.c:parse().\n", func));
    return( false );
    }

  return( true );                             /* Generic success. */
  } /* pm_process */

/* -------------------------------------------------------------------------- */