read-line.h

早期freebsd实现

/* This may look like C code, but it is really -*- C++ -*- */

/* Reads arbitrarily long string from input file, returning it as a dynamic buffer. 

   Copyright (C) 1989 Free Software Foundation, Inc.
   written by Douglas C. Schmidt ([e-mail])

This file is part of GNU GPERF.

GNU GPERF 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 1, or (at your option)
any later version.

GNU GPERF 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 GNU GPERF; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Returns a pointer to an arbitrary length string.  Returns NULL on error or EOF
   The storage for the string is dynamically allocated by new. */

#ifndef read_line_h
#define read_line_h 1

#include <stdio.h>
#include "trace.h"

class Read_Line
{
private:
  char *readln_aux (int chunks);
  FILE *fp;                       /* FILE pointer to the input stream. */
  const int CHUNK_SIZE;               /* Size of each chunk. */

public:
        Read_Line (FILE *stream = stdin, int size = BUFSIZ): 
          fp (stream), CHUNK_SIZE (size) {;}
  char *get_line (void);
};

#ifdef __OPTIMIZE__
inline char *
Read_Line::get_line (void) 
{
  T (Trace t ("Read_Line::get_line");)
  int c;

  if ((c = getc (fp)) == '#')
    {
      while (getc (fp) != '\n')
        ;

      return get_line ();
    }
  else
    {
      ungetc (c, stdin);
      return readln_aux (0);
    }
}
#endif

#endif