/*
* Copyright (c) 1984 through 2008, William LeFebvre
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*     * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
*     * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
*     * Neither the name of William LeFebvre nor the names of other
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
*  Top users/processes display for Unix
*  Version 3
*/

/*  This file contains the routines that interface to termcap and stty/gtty.
*
*  Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
*
*  I put in code to turn on the TOSTOP bit while top was running, but I
*  didn't really like the results.  If you desire it, turn on the
*  preprocessor variable "TOStop".   --wnl
*/

#include "os.h"
#include "top.h"

#if HAVE_CURSES_H && HAVE_TERM_H
#include <curses.h>
#include <term.h>
#else
#if HAVE_TERMCAP_H
#include <termcap.h>
#else
#if HAVE_CURSES_H
#include <curses.h>
#endif
#endif
#endif

#if !HAVE_DECL_TPUTS
int tputs(const char *, int, int (*)(int));
#endif
#if !HAVE_DECL_TGOTO
char *tgoto(const char *, int, int);
#endif
#if !HAVE_DECL_TGETENT
int tgetent(const char *, char *);
#endif
#if !HAVE_DECL_TGETFLAG
int tgetflag(const char *);
#endif
#if !HAVE_DECL_TGETNUM
int tgetnum(const char *);
#endif
#if !HAVE_DECL_TGETSTR
char *tgetstr(const char *, char **);
#endif

#include <sys/ioctl.h>
#ifdef CBREAK
# include <sgtty.h>
# define USE_SGTTY
#else
# ifdef TCGETA
#  define USE_TERMIO
#  include <termio.h>
# else
#  define USE_TERMIOS
#  include <termios.h>
# endif
#endif
#if defined(USE_TERMIO) || defined(USE_TERMIOS)
# ifndef TAB3
#  ifdef OXTABS
#   define TAB3 OXTABS
#  else
#   define TAB3 0
#  endif
# endif
#endif

#include "screen.h"
#include "boolean.h"

#define putcap(str)     ((str) != NULL ? (void)tputs(str, 1, putstdout) : (void)0)

extern char *myname;

char ch_erase;
char ch_kill;
char ch_werase;
char smart_terminal;
int  screen_length;
int  screen_width;

char PC;

static int  tc_overstrike;
static char termcap_buf[1024];
static char string_buffer[1024];
static char home[15];
static char lower_left[15];
static char *tc_clear_line;
static char *tc_clear_screen;
static char *tc_clear_to_end;
static char *tc_cursor_motion;
static char *tc_start_standout;
static char *tc_end_standout;
static char *terminal_init;
static char *terminal_end;

#ifdef USE_SGTTY
static struct sgttyb old_settings;
static struct sgttyb new_settings;
#endif
#ifdef USE_TERMIO
static struct termio old_settings;
static struct termio new_settings;
#endif
#ifdef USE_TERMIOS
static struct termios old_settings;
static struct termios new_settings;
#endif
static char is_a_terminal = No;
#ifdef TOStop
static int old_lword;
static int new_lword;
#endif

#define STDIN   0
#define STDOUT  1
#define STDERR  2

/* This has to be defined as a subroutine for tputs (instead of a macro) */

static int
putstdout(TPUTS_PUTC_ARGTYPE ch)

{
   return putchar((int)ch);
}

void
screen_getsize()

{
   char *go;
#ifdef TIOCGWINSZ

   struct winsize ws;

   if (ioctl (1, TIOCGWINSZ, &ws) != -1)
   {
       if (ws.ws_row != 0)
       {
           screen_length = ws.ws_row;
       }
       if (ws.ws_col != 0)
       {
           screen_width = ws.ws_col - 1;
       }
   }

#else
#ifdef TIOCGSIZE

   struct ttysize ts;

   if (ioctl (1, TIOCGSIZE, &ts) != -1)
   {
       if (ts.ts_lines != 0)
       {
           screen_length = ts.ts_lines;
       }
       if (ts.ts_cols != 0)
       {
           screen_width = ts.ts_cols - 1;
       }
   }

#endif /* TIOCGSIZE */
#endif /* TIOCGWINSZ */

   if ((go = tgoto(tc_cursor_motion, 0, screen_length - 1)) != NULL)
       (void) strcpy(lower_left, go);
   else
       lower_left[0] = '\0';
}

int
screen_readtermcap(int interactive)

{
   char *bufptr;
   char *PCptr;
   char *term_name;
   char *go;
   int status;

   /* set defaults in case we aren't smart */
   screen_width = MAX_COLS;
   screen_length = 0;

   if (interactive == No)
   {
       /* pretend we have a dumb terminal */
       smart_terminal = No;
       return No;
   }

   /* assume we have a smart terminal until proven otherwise */
   smart_terminal = Yes;

   /* get the terminal name */
   term_name = getenv("TERM");

   /* if there is no TERM, assume it's a dumb terminal */
   /* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
   if (term_name == NULL)
   {
       smart_terminal = No;
       return No;
   }

   /* now get the termcap entry */
   if ((status = tgetent(termcap_buf, term_name)) != 1)
   {
       if (status == -1)
       {
           fprintf(stderr, "%s: can't open termcap file\n", myname);
       }
       else
       {
           fprintf(stderr, "%s: no termcap entry for a `%s' terminal\n",
                   myname, term_name);
       }

       /* pretend it's dumb and proceed */
       smart_terminal = No;
       return No;
   }

   /* "hardcopy" immediately indicates a very stupid terminal */
   if (tgetflag("hc"))
   {
       smart_terminal = No;
       return No;
   }

   /* set up common terminal capabilities */
   if ((screen_length = tgetnum("li")) <= 0)
   {
       screen_length = 0;
   }

   /* screen_width is a little different */
   if ((screen_width = tgetnum("co")) == -1)
   {
       screen_width = 79;
   }
   else
   {
       screen_width -= 1;
   }

   /* terminals that overstrike need special attention */
   tc_overstrike = tgetflag("os");

   /* initialize the pointer into the termcap string buffer */
   bufptr = string_buffer;

   /* get "ce", clear to end */
   if (!tc_overstrike)
   {
       tc_clear_line = tgetstr("ce", &bufptr);
   }

   /* get necessary capabilities */
   if ((tc_clear_screen  = tgetstr("cl", &bufptr)) == NULL ||
       (tc_cursor_motion = tgetstr("cm", &bufptr)) == NULL)
   {
       smart_terminal = No;
       return No;
   }

   /* get some more sophisticated stuff -- these are optional */
   tc_clear_to_end   = tgetstr("cd", &bufptr);
   terminal_init  = tgetstr("ti", &bufptr);
   terminal_end   = tgetstr("te", &bufptr);
   tc_start_standout = tgetstr("so", &bufptr);
   tc_end_standout   = tgetstr("se", &bufptr);

   /* pad character */
   PC = (PCptr = tgetstr("pc", &bufptr)) ? *PCptr : 0;

   /* set convenience strings */
   if ((go = tgoto(tc_cursor_motion, 0, 0)) != NULL)
       (void) strcpy(home, go);
   else
       home[0] = '\0';
   /* (lower_left is set in screen_getsize) */

   /* get the actual screen size with an ioctl, if needed */
   /* This may change screen_width and screen_length, and it always
      sets lower_left. */
   screen_getsize();

   /* If screen_length is 0 from both termcap and ioctl then we are dumb */
   if (screen_length == 0)
   {
       smart_terminal = No;
       return No;
   }

   /* if stdout is not a terminal, pretend we are a dumb terminal */
#ifdef USE_SGTTY
   if (ioctl(STDOUT, TIOCGETP, &old_settings) == -1)
   {
       smart_terminal = No;
   }
#endif
#ifdef USE_TERMIO
   if (ioctl(STDOUT, TCGETA, &old_settings) == -1)
   {
       smart_terminal = No;
   }
#endif
#ifdef USE_TERMIOS
   if (tcgetattr(STDOUT, &old_settings) == -1)
   {
       smart_terminal = No;
   }
#endif

   return smart_terminal;
}

void
screen_init()

{
   /* get the old settings for safe keeping */
#ifdef USE_SGTTY
   if (ioctl(STDOUT, TIOCGETP, &old_settings) != -1)
   {
       /* copy the settings so we can modify them */
       new_settings = old_settings;

       /* turn on CBREAK and turn off character echo and tab expansion */
       new_settings.sg_flags |= CBREAK;
       new_settings.sg_flags &= ~(ECHO|XTABS);
       (void) ioctl(STDOUT, TIOCSETP, &new_settings);

       /* remember the erase and kill characters */
       ch_erase = old_settings.sg_erase;
       ch_kill  = old_settings.sg_kill;
       ch_werase  = old_settings.sg_werase;

#ifdef TOStop
       /* get the local mode word */
       (void) ioctl(STDOUT, TIOCLGET, &old_lword);

       /* modify it */
       new_lword = old_lword | LTOSTOP;
       (void) ioctl(STDOUT, TIOCLSET, &new_lword);
#endif
       /* remember that it really is a terminal */
       is_a_terminal = Yes;

       /* send the termcap initialization string */
       putcap(terminal_init);
   }
#endif
#ifdef USE_TERMIO
   if (ioctl(STDOUT, TCGETA, &old_settings) != -1)
   {
       /* copy the settings so we can modify them */
       new_settings = old_settings;

       /* turn off ICANON, character echo and tab expansion */
       new_settings.c_lflag &= ~(ICANON|ECHO);
       new_settings.c_oflag &= ~(TAB3);
       new_settings.c_cc[VMIN] = 1;
       new_settings.c_cc[VTIME] = 0;
       (void) ioctl(STDOUT, TCSETA, &new_settings);

       /* remember the erase and kill characters */
       ch_erase  = old_settings.c_cc[VERASE];
       ch_kill   = old_settings.c_cc[VKILL];
       ch_werase = old_settings.c_cc[VWERASE];

       /* remember that it really is a terminal */
       is_a_terminal = Yes;

       /* send the termcap initialization string */
       putcap(terminal_init);
   }
#endif
#ifdef USE_TERMIOS
   if (tcgetattr(STDOUT, &old_settings) != -1)
   {
       /* copy the settings so we can modify them */
       new_settings = old_settings;

       /* turn off ICANON, character echo and tab expansion */
       new_settings.c_lflag &= ~(ICANON|ECHO);
       new_settings.c_oflag &= ~(TAB3);
       new_settings.c_cc[VMIN] = 1;
       new_settings.c_cc[VTIME] = 0;
       (void) tcsetattr(STDOUT, TCSADRAIN, &new_settings);

       /* remember the erase and kill characters */
       ch_erase  = old_settings.c_cc[VERASE];
       ch_kill   = old_settings.c_cc[VKILL];
       ch_werase = old_settings.c_cc[VWERASE];

       /* remember that it really is a terminal */
       is_a_terminal = Yes;

       /* send the termcap initialization string */
       putcap(terminal_init);
   }
#endif

   if (!is_a_terminal)
   {
       /* not a terminal at all---consider it dumb */
       smart_terminal = No;
   }
}

void
screen_end()

{
   /* move to the lower left, clear the line and send "te" */
   if (smart_terminal)
   {
       putcap(lower_left);
       putcap(tc_clear_line);
       fflush(stdout);
       putcap(terminal_end);
   }

   /* if we have settings to reset, then do so */
   if (is_a_terminal)
   {
#ifdef USE_SGTTY
       (void) ioctl(STDOUT, TIOCSETP, &old_settings);
#ifdef TOStop
       (void) ioctl(STDOUT, TIOCLSET, &old_lword);
#endif
#endif
#ifdef USE_TERMIO
       (void) ioctl(STDOUT, TCSETA, &old_settings);
#endif
#ifdef USE_TERMIOS
       (void) tcsetattr(STDOUT, TCSADRAIN, &old_settings);
#endif
   }
}

void
screen_reinit()

{
   /* install our settings if it is a terminal */
   if (is_a_terminal)
   {
#ifdef USE_SGTTY
       (void) ioctl(STDOUT, TIOCSETP, &new_settings);
#ifdef TOStop
       (void) ioctl(STDOUT, TIOCLSET, &new_lword);
#endif
#endif
#ifdef USE_TERMIO
       (void) ioctl(STDOUT, TCSETA, &new_settings);
#endif
#ifdef USE_TERMIOS
       (void) tcsetattr(STDOUT, TCSADRAIN, &new_settings);
#endif
   }

   /* send init string */
   if (smart_terminal)
   {
       putcap(terminal_init);
   }
}

void
screen_move(int x, int y)

{
   char *go = tgoto(tc_cursor_motion, x, y);
   if (go)
       tputs(go, 1, putstdout);
}

void
screen_standout(const char *msg)

{
   if (smart_terminal)
   {
       putcap(tc_start_standout);
       fputs(msg, stdout);
       putcap(tc_end_standout);
   }
   else
   {
       fputs(msg, stdout);
   }
}

void
screen_clear(void)

{
   if (smart_terminal)
   {
       putcap(tc_clear_screen);
   }
}

int
screen_cte(void)

{
   if (smart_terminal)
   {
       if (tc_clear_to_end)
       {
           putcap(tc_clear_to_end);
           return(Yes);
       }
   }
   return(No);
}

void
screen_cleareol(int len)

{
   int i;

   if (smart_terminal && !tc_overstrike && len > 0)
   {
       if (tc_clear_line)
       {
           putcap(tc_clear_line);
           return;
       }
       else
       {
           i = 0;
           while (i++ < 0)
           {
               putchar(' ');
           }
           i = 0;
           while (i++ < 0)
           {
               putchar('\b');
           }
           return;
       }
   }
   return;
}

void
screen_home(void)

{
   if (smart_terminal)
   {
       putcap(home);
   }
}

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