std_str.sprut

/* This is file `std_str.sprut'.  The file contains description of C
   string type and its type specific macros (see SPRUT documentation).
   The macros is implemented with the aid of macros for work with
   memory from the file `std_mem.sprut' or `std_bmem.sprut' therefore
   one of these files must be placed before `std_str.sprut' in
   '%extend' construction and the initiation function from the file
   `std_mem.sprut' must be called before usage macros from this
   file.

   Copyright (C) 1997-2016 Vladimir Makarov.

   Written by Vladimir Makarov <vmakarov@gcc.gnu.org>

   This file is part of the tool SPRUT.

   This 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 2, or (at your option)
   any later version.

   This software 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 CC; see the file COPYING.  If not, write to the Free
   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.

 */

%type string_t

%import {

#include <stdio.h>
#include <string.h>

/* The following type is usual C repesentation of strings. */

typedef char *string_t;

}

%local {

/* Type specific macros (see SPRUT documentation) for `string_t': */
#define IR_BEGIN_string_t(a)        ((a) = "")
#define IR_END_string_t(a)          
#define IR_COPY_string_t(a, b)      ((a) = (b))
#define IR_EQUAL_string_t(a, b)     (strcmp ((a), (b)) == 0)
#define IR_PRINT_string_t(a)        printf ("%s", (a))
#define IR_INPUT_string_t(file, a)  input_string_t ((file), &(a))
#define IR_OUTPUT_string_t(file, a) output_string_t ((file), (a))

extern int input_string_t (FILE *f, char **str);

extern int output_string_t (FILE *f, const char *str);

}

%%

%%

/* The following function allocates memory on the top of current block
   memory region (setting up its address in *STR) and inputs string to
   the memory from given file F.  The function returns TRUE if input
   is ok, FALSE otherwise. */

int
input_string_t (FILE *f, char **str)
{
  int length;

  if (fread (&length, sizeof (length), 1, f) != sizeof (length) || length < 0)
    return 1 /* TRUE */;
  IR_TOP_EXPAND (length + 1);
  *str = IR_TOP_BEGIN ();
  IR_TOP_FINISH ();
  return fread (*str, length + 1, 1, f) != length + 1;
}


/* The following function outputs given string STR (its length and its
   bytes including finish zero byte) to given file F.  The function
   returns TRUE if output is ok, FALSE otherwise.  */

int
output_string_t (FILE *f, const char *str)
{
  int length;

  length = strlen (str);
  if (fwrite (&length, sizeof (length), 1, f) != sizeof (length))
    return 1 /* TRUE */;
  return fwrite (str, length + 1, 1, f) != length + 1;
}

/*
Local Variables:
mode:c
End:
*/