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Sourcecode: fhist version File versions

stdin.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 2000, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    This program 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 of the License, or
 *    (at your option) any later version.
 *
 *    This program 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 this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate stdins
 */

#include <ac/stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <error_intl.h>
#include <input/private.h>
#include <input/stdin.h>
#include <str.h>


static string_ty *
standard_input(void)
{
      static string_ty *name;
      sub_context_ty    *scp;

      if (!name)
      {
            scp = sub_context_new();
            name = subst_intl(scp, i18n("standard input"));
            sub_context_delete(scp);
      }
      return name;
}


static void
destruct(input_ty *this)
{
}


static long
iread(input_ty *this, void *data, long len)
{
      long        result;

      if (len <= 0)
            return 0;
      result = fread(data, 1, len, stdin);
      if (result <= 0 && ferror(stdin))
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_errno_set(scp);
            sub_var_set_string(scp, "File_Name", standard_input());
            fatal_intl(scp, i18n("read \"$filename\": $errno"));
            /* NOTREACHED */
      }
      return result;
}


static int
get(input_ty *this)
{
      int         c;

      c = getchar();
      if (c == EOF && ferror(stdin))
      {
            sub_context_ty    *scp;

            scp = sub_context_new();
            sub_errno_set(scp);
            sub_var_set_string(scp, "File_Name", standard_input());
            fatal_intl(scp, i18n("read \"$filename\": $errno"));
            /* NOTREACHED */
      }
      return c;
}


static long
itell(input_ty *this)
{
      return ftell(stdin);
}


static const char *
name(input_ty *this)
{
      return standard_input()->str_text;
}


static long
length(input_ty *this)
{
      struct stat st;

      if (fstat(fileno(stdin), &st) < 0)
            return -1;
      if (!S_ISREG(st.st_mode))
            return -1;
      return st.st_size;
}


static input_vtbl_ty vtbl =
{
      sizeof(input_ty),
      destruct,
      iread,
      get,
      itell,
      name,
      length,
};


input_ty *
input_stdin(void)
{
      return input_new(&vtbl);
}

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