gas/input-file.h

   1 /* input_file.h header for input-file.c
   2    Copyright (C) 1987-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19    02110-1301, USA.  */
  20
  21 /*"input_file.c":Operating-system dependent functions to read source files.*/
  22
  23 /*
  24  * No matter what the operating system, this module must provide the
  25  * following services to its callers.
  26  *
  27  * input_file_begin()                   Call once before anything else.
  28  *
  29  * input_file_end()                     Call once after everything else.
  30  *
  31  * input_file_buffer_size()             Call anytime. Returns largest possible
  32  *                                      delivery from
  33  *                                      input_file_give_next_buffer().
  34  *
  35  * input_file_open(name)                Call once for each input file.
  36  *
  37  * input_file_give_next_buffer(where)   Call once to get each new buffer.
  38  *                                      Return 0: no more chars left in file,
  39  *                                         the file has already been closed.
  40  *                                      Otherwise: return a pointer to just
  41  *                                         after the last character we read
  42  *                                         into the buffer.
  43  *                                      If we can only read 0 characters, then
  44  *                                      end-of-file is faked.
  45  *
  46  * input_file_push()                    Push state, which can be restored
  47  *                                      later.  Does implicit input_file_begin.
  48  *                                      Returns char * to saved state.
  49  *
  50  * input_file_pop (arg)                 Pops previously saved state.
  51  *
  52  * input_file_close ()                  Closes opened file.
  53  *
  54  * All errors are reported so caller doesn't have to think
  55  * about I/O errors.
  56  */
  57
  58 char *input_file_give_next_buffer (char *where);
  59 char *input_file_push (void);
  60 size_t input_file_buffer_size (void);
  61 void input_file_begin (void);
  62 void input_file_close (void);
  63 void input_file_end (void);
  64 void input_file_open (const char *filename, int pre);
  65 void input_file_pop (char *arg);