Logo Search packages:      
Sourcecode: fhist version File versions

page.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 1998, 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 pages
 */

#include <ac/stdlib.h>
#include <ac/termios.h>

#include <arglex.h>
#include <error_intl.h>
#include <page.h>


#define MIN_PAGE_WIDTH 40
/* MAX_PAGE_WIDTH is defined in common/page.h */
#define DEFAULT_PAGE_WIDTH 80
#define MIN_PAGE_LENGTH 10
#define MAX_PAGE_LENGTH 30000
#define DEFAULT_PAGE_LENGTH 24

static      int   page_length;
static      int   page_width;


static void
default_page_sizes(void)
{
      if (!page_width)
      {
            char  *cp;

            cp = getenv("COLS");
            if (cp)
            {
                  int   n;

                  n = atoi(cp);
                  if (n > 0)
                  {
                        if (n < MIN_PAGE_WIDTH)
                              n = MIN_PAGE_WIDTH;
                        if (n > MAX_PAGE_WIDTH)
                              n = MAX_PAGE_WIDTH;
                        page_width = n;
                  }
            }
      }
      if (!page_length)
      {
            char  *cp;

            cp = getenv("LINES");
            if (cp)
            {
                  int   n;

                  n = atoi(cp);
                  if (n > 0)
                  {
                        if (n < MIN_PAGE_LENGTH)
                              n = MIN_PAGE_LENGTH;
                        if (n > MAX_PAGE_LENGTH)
                              n = MAX_PAGE_LENGTH;
                        page_length = n;
                  }
            }
      }

#ifdef TIOCGWINSZ
      if (!page_width || !page_length)
      {
            struct winsize    ws;

            if (ioctl(0, TIOCGWINSZ, &ws) == 0)
            {
                  if (!page_width && ws.ws_col > 0)
                  {
                        page_width = ws.ws_col;
                        if (page_width < MIN_PAGE_WIDTH)
                              page_width = MIN_PAGE_WIDTH;
                        if (page_width > MAX_PAGE_WIDTH)
                              page_width = MAX_PAGE_WIDTH;
                  }
                  if (!page_length && ws.ws_row > 0)
                  {
                        page_length = ws.ws_row;
                        if (page_length < MIN_PAGE_LENGTH)
                              page_length = MIN_PAGE_LENGTH;
                        if (page_length > MAX_PAGE_LENGTH)
                              page_length = MAX_PAGE_LENGTH;
                  }
            }
      }
#endif

      if (!page_width)
            page_width = DEFAULT_PAGE_WIDTH;
      if (!page_length)
            page_length = DEFAULT_PAGE_LENGTH;
}


#if 0

void
page_width_set(int n)
{
      sub_context_ty    *scp;

      if (page_width)
      {
            scp = sub_context_new();
            sub_var_set
            (
                  scp,
                  "Name",
                  "%s",
                  arglex_token_name(arglex_token_page_width)
            );
            fatal_intl(scp, i18n("duplicate \"$name\" option"));
            /* NOTREACHED */
      }
      if (n < MIN_PAGE_WIDTH || n > MAX_PAGE_WIDTH)
      {
            scp = sub_context_new();
            sub_var_set(scp, "Number", "%d", n);
            fatal_intl(scp, i18n("page width $number out of range"));
            /* NOTREACHED */
      }
      page_width = n;
}

#endif


int
page_width_get(void)
{
      /*
       * must not generate a fatal error in this function,
       * as it is used by 'error.c' when reporting fatal errors.
       *
       * must not put tracing in this function,
       * because 'trace.c' uses it to determine the width.
       */
      if (!page_width)
            default_page_sizes();
      return page_width;
}


#if 0

void
page_length_set(int n)
{
      sub_context_ty    *scp;

      if (page_length)
      {
            scp = sub_context_new();
            sub_var_set
            (
                  scp,
                  "Name",
                  "%s",
                  arglex_token_name(arglex_token_page_length)
            );
            fatal_intl(scp, i18n("duplicate \"$name\" option"));
            /* NOTREACHED */
      }
      if (n < MIN_PAGE_LENGTH || n > MAX_PAGE_LENGTH)
      {
            scp = sub_context_new();
            sub_var_set(scp, "Number", "%d", n);
            fatal_intl(scp, i18n("page length $number out of range"));
            /* NOTREACHED */
      }
      page_length = n;
}

#endif


int
page_length_get(void)
{
      if (!page_length)
            default_page_sizes();
      return page_length;
}

Generated by  Doxygen 1.6.0   Back to index