gas/input-file.h

   1 /* input_file.h header for input-file.c
   2    Copyright 1987, 1992, 1993, 2000, 2003, 2005, 2006
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 /*"input_file.c":Operating-system dependant functions to read source files.*/
  23
  24 /*
  25  * No matter what the operating system, this module must provide the
  26  * following services to its callers.
  27  *
  28  * input_file_begin()                   Call once before anything else.
  29  *
  30  * input_file_end()                     Call once after everything else.
  31  *
  32  * input_file_buffer_size()             Call anytime. Returns largest possible
  33  *                                      delivery from
  34  *                                      input_file_give_next_buffer().
  35  *
  36  * input_file_open(name)                Call once for each input file.
  37  *
  38  * input_file_give_next_buffer(where)   Call once to get each new buffer.
  39  *                                      Return 0: no more chars left in file,
  40  *                                         the file has already been closed.
  41  *                                      Otherwise: return a pointer to just
  42  *                                         after the last character we read
  43  *                                         into the buffer.
  44  *                                      If we can only read 0 characters, then
  45  *                                      end-of-file is faked.
  46  *
  47  * input_file_push()                    Push state, which can be restored
  48  *                                      later.  Does implicit input_file_begin.
  49  *                                      Returns char * to saved state.
  50  *
  51  * input_file_pop (arg)                 Pops previously saved state.
  52  *
  53  * input_file_close ()                  Closes opened file.
  54  *
  55  * All errors are reported so caller doesn't have to think
  56  * about I/O errors.
  57  */
  58
  59 char *input_file_give_next_buffer (char *where);
  60 char *input_file_push (void);
  61 unsigned int input_file_buffer_size (void);
  62 void input_file_begin (void);
  63 void input_file_close (void);
  64 void input_file_end (void);
  65 void input_file_open (char *filename, int pre);
  66 void input_file_pop (char *arg);