/*	$OpenBSD: refresh.c,v 1.21 2017/07/26 12:10:56 schwarze Exp $	*/

/*	$NetBSD: refresh.c,v 1.50 2016/05/02 16:35:17 christos Exp $	*/

/*-

 * Copyright (c) 1992, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Christos Zoulas of Cornell University.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.

 */

#include "config.h"

/*

 * refresh.c: Lower level screen refreshing functions

 */

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include "el.h"

static void	re_nextline(EditLine *);

static void	re_addc(EditLine *, wint_t);

static void	re_update_line(EditLine *, wchar_t *, wchar_t *, int);

static void	re_insert (EditLine *, wchar_t *, int, int, wchar_t *, int);

static void	re_delete(EditLine *, wchar_t *, int, int, int);

static void	re_fastputc(EditLine *, wint_t);

static void	re_clear_eol(EditLine *, int, int, int);

static void	re__strncopy(wchar_t *, wchar_t *, size_t);

static void	re__copy_and_pad(wchar_t *, const wchar_t *, size_t);

#ifdef DEBUG_REFRESH

static void	re_printstr(EditLine *, const char *, wchar_t *, wchar_t *);

#define	__F el->el_errfile

#define	ELRE_ASSERT(a, b, c)	do				\

				    if (/*CONSTCOND*/ a) {	\

					(void) fprintf b;	\

					c;			\

				    }				\

				while (/*CONSTCOND*/0)

#define	ELRE_DEBUG(a, b)	ELRE_ASSERT(a,b,;)

/* re_printstr():

 *	Print a string on the debugging pty

 */

static void

re_printstr(EditLine *el, const char *str, wchar_t *f, wchar_t *t)

{

	ELRE_DEBUG(1, (__F, "%s:\"", str));

	while (f < t)

		ELRE_DEBUG(1, (__F, "%c", *f++ & 0177));

	ELRE_DEBUG(1, (__F, "\"\r\n"));

}

#else

#define	ELRE_ASSERT(a, b, c)

#define	ELRE_DEBUG(a, b)

#endif

/* re_nextline():

 *	Move to the next line or scroll

 */

static void

re_nextline(EditLine *el)

{

	/*

	 * If we would overflow (input is longer than terminal size),

	 * emulate scroll by dropping first line and shuffling the rest.

	 * We do this via pointer shuffling - it's safe in this case

	 * and we avoid memcpy().

	 */

		int i, lins = el->el_terminal.t_size.v;

	ELRE_ASSERT(el->el_refresh.r_cursor.v >= el->el_terminal.t_size.v,

	    (__F, "\r\nre_putc: overflow! r_cursor.v == %d > %d\r\n",

	    el->el_refresh.r_cursor.v, el->el_terminal.t_size.v),

	    abort());

}

/* re_addc():

 *	Draw c, expanding tabs, control chars etc.

 */

static void

re_addc(EditLine *el, wint_t c)

{

	case CHTYPE_TAB:        /* expand the tab */

				break;			/* go until tab stop */

		}

		break;

	case CHTYPE_NL: {

		break;

	}

	case CHTYPE_PRINT:

	default: {

		ssize_t i, n =

		break;

	}

	}

}

/* re_putc():

 *	Draw the character given

 */

protected void

re_putc(EditLine *el, wint_t c, int shift)

{

	ELRE_DEBUG(1, (__F, "printing %5x '%lc'\r\n", c, c));

		w = 0;

	/* assumes !shift is only used for single-column chars */

	i = w;

		/* assure end of line */

	}

}

/* re_refresh():

 *	draws the new virtual screen image from the current input

 *	line, then goes line-by-line changing the real image to the new

 *	virtual image. The routine to re-draw a line can be replaced

 *	easily in hopes of a smarter one being placed there.

 */

protected void

re_refresh(EditLine *el)

{

	int i, rhdiff;

	wchar_t *cp, *st;

	coord_t cur;

#ifdef notyet

	size_t termsz;

#endif

	ELRE_DEBUG(1, (__F, "el->el_line.buffer = :%ls:\r\n",

	    el->el_line.buffer));

	/* reset the Drawing cursor */

	/* temporarily draw rprompt to calculate its size */

	/* reset the Drawing cursor */

		else

	}

	cur.h = -1;		/* set flag in case I'm not set */

	cur.v = 0;

	/* draw the current input buffer */

#if notyet

	termsz = el->el_terminal.t_size.h * el->el_terminal.t_size.v;

	if (el->el_line.lastchar - el->el_line.buffer > termsz) {

		/*

		 * If line is longer than terminal, process only part

		 * of line which would influence display.

		 */

		size_t rem = (el->el_line.lastchar-el->el_line.buffer)%termsz;

		st = el->el_line.lastchar - rem

			- (termsz - (((rem / el->el_terminal.t_size.v) - 1)

					* el->el_terminal.t_size.v));

	} else

#endif

			/* save for later */

                        /* handle being at a linebroken doublewidth char */

				cur.h = 0;

                        }

		}

	}

	}

		/*

		 * have a right-hand side prompt that will fit

		 * on the end of the first line with at least

		 * one character gap to the input buffer.

		 */

	}

	ELRE_DEBUG(1, (__F,

		"term.h=%d vcur.h=%d vcur.v=%d vdisplay[0]=\r\n:%80.80s:\r\n",

		el->el_terminal.t_size.h, el->el_refresh.r_cursor.h,

		el->el_refresh.r_cursor.v, ct_encode_string(el->el_vdisplay[0],

		&el->el_scratch)));

	ELRE_DEBUG(1, (__F, "updating %d lines.\r\n", el->el_refresh.r_newcv));

		/* NOTE THAT re_update_line MAY CHANGE el_display[i] */

		/*

		 * Copy the new line to be the current one, and pad out with

		 * spaces to the full width of the terminal so that if we try

		 * moving the cursor by writing the character that is at the

		 * end of the screen line, it won't be a NUL or some old

		 * leftover stuff.

		 */

	}

	ELRE_DEBUG(1, (__F,

	"\r\nel->el_refresh.r_cursor.v=%d,el->el_refresh.r_oldcv=%d i=%d\r\n",

	    el->el_refresh.r_cursor.v, el->el_refresh.r_oldcv, i));

                        /* This wcslen should be safe even with MB_FILL_CHARs */

#ifdef DEBUG_REFRESH

			terminal_overwrite(el, L"C\b", 2);

#endif /* DEBUG_REFRESH */

		}

	ELRE_DEBUG(1, (__F,

	    "\r\ncursor.h = %d, cursor.v = %d, cur.h = %d, cur.v = %d\r\n",

	    el->el_refresh.r_cursor.h, el->el_refresh.r_cursor.v,

	    cur.h, cur.v));

}

/* re_goto_bottom():

 *	 used to go to last used screen line

 */

protected void

re_goto_bottom(EditLine *el)

{

}

/* re_insert():

 *	insert num characters of s into d (in front of the character)

 *	at dat, maximum length of d is dlen

 */

static void

/*ARGSUSED*/

re_insert(EditLine *el __attribute__((__unused__)),

    wchar_t *d, int dat, int dlen, wchar_t *s, int num)

{

	wchar_t *a, *b;

	ELRE_DEBUG(1,

	    (__F, "re_insert() starting: %d at %d max %d, d == \"%s\"\n",

	    num, dat, dlen, ct_encode_string(d, &el->el_scratch)));

	ELRE_DEBUG(1, (__F, "s == \"%s\"\n", ct_encode_string(s,

	    &el->el_scratch)));

	/* open up the space for num chars */

	}

	ELRE_DEBUG(1, (__F,

		"re_insert() after insert: %d at %d max %d, d == \"%s\"\n",

		num, dat, dlen, ct_encode_string(d, &el->el_scratch)));

	ELRE_DEBUG(1, (__F, "s == \"%s\"\n", ct_encode_string(s,

		&el->el_scratch)));

	/* copy the characters */

#ifdef notyet

        /* ct_encode_string() uses a static buffer, so we can't conveniently

         * encode both d & s here */

	ELRE_DEBUG(1,

	    (__F, "re_insert() after copy: %d at %d max %d, %s == \"%s\"\n",

	    num, dat, dlen, d, s));

	ELRE_DEBUG(1, (__F, "s == \"%s\"\n", s));

#endif

}

/* re_delete():

 *	delete num characters d at dat, maximum length of d is dlen

 */

static void

/*ARGSUSED*/

re_delete(EditLine *el __attribute__((__unused__)),

    wchar_t *d, int dat, int dlen, int num)

{

	wchar_t *a, *b;

	}

	ELRE_DEBUG(1,

	    (__F, "re_delete() starting: %d at %d max %d, d == \"%s\"\n",

	    num, dat, dlen, ct_encode_string(d, &el->el_scratch)));

	/* open up the space for num chars */

	}

	ELRE_DEBUG(1,

	    (__F, "re_delete() after delete: %d at %d max %d, d == \"%s\"\n",

	    num, dat, dlen, ct_encode_string(d, &el->el_scratch)));

}

/* re__strncopy():

 *	Like strncpy without padding.

 */

static void

re__strncopy(wchar_t *a, wchar_t *b, size_t n)

{

}

/* re_clear_eol():

 *	Find the number of characters we need to clear till the end of line

 *	in order to make sure that we have cleared the previous contents of

 *	the line. fx and sx is the number of characters inserted or deleted

 *	in the first or second diff, diff is the difference between the

 *	number of characters between the new and old line.

 */

static void

re_clear_eol(EditLine *el, int fx, int sx, int diff)

{

	ELRE_DEBUG(1, (__F, "re_clear_eol sx %d, fx %d, diff %d\n",

	    sx, fx, diff));

	ELRE_DEBUG(1, (__F, "re_clear_eol %d\n", diff));

}

/*****************************************************************

    re_update_line() is based on finding the middle difference of each line

    on the screen; vis:

			     /old first difference

	/beginning of line   |              /old last same       /old EOL

	v		     v              v                    v

old:	eddie> Oh, my little gruntle-buggy is to me, as lurgid as

new:	eddie> Oh, my little buggy says to me, as lurgid as

	^		     ^        ^			   ^

	\beginning of line   |        \new last same	   \new end of line

			     \new first difference

    all are character pointers for the sake of speed.  Special cases for

    no differences, as well as for end of line additions must be handled.

**************************************************************** */

/* Minimum at which doing an insert it "worth it".  This should be about

 * half the "cost" of going into insert mode, inserting a character, and

 * going back out.  This should really be calculated from the termcap

 * data...  For the moment, a good number for ANSI terminals.

 */

#define	MIN_END_KEEP	4

static void

re_update_line(EditLine *el, wchar_t *old, wchar_t *new, int i)

{

	wchar_t *o, *n, *p, c;

	wchar_t *ofd, *ols, *oe, *nfd, *nls, *ne;

	wchar_t *osb, *ose, *nsb, *nse;

	int fx, sx;

	size_t len;

	/*

         * find first diff

         */

		continue;

	ofd = o;

	nfd = n;

	/*

         * Find the end of both old and new

         */

	/*

         * Remove any trailing blanks off of the end, being careful not to

         * back up past the beginning.

         */

			break;

	}

	oe = o;

	/* remove blanks from end of new */

			break;

	}

	ne = n;

	/*

         * if no diff, continue to next line of redraw

         */

		ELRE_DEBUG(1, (__F, "no difference.\r\n"));

	}

	/*

         * find last same pointer

         */

	/*

         * find same beginning and same end

         */

	osb = ols;

	nsb = nls;

	ose = ols;

	nse = nls;

	/*

         * case 1: insert: scan from nfd to nls looking for *ofd

         */

					continue;

				/*

				 * if the new match is longer and it's worth

				 * keeping, then we take it

				 */

					nsb = n;

					nse = p;

					osb = ofd;

					ose = o;

				}

			}

		}

	}

	/*

         * case 2: delete: scan from ofd to ols looking for *nfd

         */

					continue;

				/*

				 * if the new match is longer and it's worth

				 * keeping, then we take it

				 */

					nsb = nfd;

					nse = n;

					osb = o;

					ose = p;

				}

			}

		}

	}

	/*

         * Pragmatics I: If old trailing whitespace or not enough characters to

         * save to be worth it, then don't save the last same info.

         */

		ols = oe;

		nls = ne;

	}

	/*

         * Pragmatics II: if the terminal isn't smart enough, make the data

         * dumber so the smart update doesn't try anything fancy

         */

	/*

         * fx is the number of characters we need to insert/delete: in the

         * beginning to bring the two same begins together

         */

	/*

         * sx is the number of characters we need to insert/delete: in the

         * end to bring the two same last parts together

         */

			osb = ols;

			ose = ols;

			nsb = nls;

			nse = nls;

		}

			ols = oe;

			nls = ne;

		}

			ols = oe;

			nls = ne;

		}

	}

			osb = ols;

			ose = ols;

			nsb = nls;

			nse = nls;

		}

			ols = oe;

			nls = ne;

		}

			ols = oe;

			nls = ne;

		}

	}

	/*

         * Pragmatics III: make sure the middle shifted pointers are correct if

         * they don't point to anything (we may have moved ols or nls).

         */

	/* if the change isn't worth it, don't bother */

	/* was: if (osb == ose) */

		osb = ols;

		ose = ols;

		nsb = nls;

		nse = nls;

	}

	/*

         * Now that we are done with pragmatics we recompute fx, sx

         */

	ELRE_DEBUG(1, (__F, "fx %d, sx %d\n", fx, sx));

	ELRE_DEBUG(1, (__F, "ofd %td, osb %td, ose %td, ols %td, oe %td\n",

		ofd - old, osb - old, ose - old, ols - old, oe - old));

	ELRE_DEBUG(1, (__F, "nfd %td, nsb %td, nse %td, nls %td, ne %td\n",

		nfd - new, nsb - new, nse - new, nls - new, ne - new));

	ELRE_DEBUG(1, (__F,

		"xxx-xxx:\"00000000001111111111222222222233333333334\"\r\n"));

	ELRE_DEBUG(1, (__F,

		"xxx-xxx:\"01234567890123456789012345678901234567890\"\r\n"));

#ifdef DEBUG_REFRESH

	re_printstr(el, "old- oe", old, oe);

	re_printstr(el, "new- ne", new, ne);

	re_printstr(el, "old-ofd", old, ofd);

	re_printstr(el, "new-nfd", new, nfd);

	re_printstr(el, "ofd-osb", ofd, osb);

	re_printstr(el, "nfd-nsb", nfd, nsb);

	re_printstr(el, "osb-ose", osb, ose);

	re_printstr(el, "nsb-nse", nsb, nse);

	re_printstr(el, "ose-ols", ose, ols);

	re_printstr(el, "nse-nls", nse, nls);

	re_printstr(el, "ols- oe", ols, oe);

	re_printstr(el, "nls- ne", nls, ne);

#endif /* DEBUG_REFRESH */

	/*

         * el_cursor.v to this line i MUST be in this routine so that if we

         * don't have to change the line, we don't move to it. el_cursor.h to

         * first diff char

         */

	/*

         * at this point we have something like this:

         *

         * /old                  /ofd    /osb               /ose    /ols     /oe

         * v.....................v       v..................v       v........v

         * eddie> Oh, my fredded gruntle-buggy is to me, as foo var lurgid as

         * eddie> Oh, my fredded quiux buggy is to me, as gruntle-lurgid as

         * ^.....................^     ^..................^       ^........^

         * \new                  \nfd  \nsb               \nse     \nls    \ne

         *

         * fx is the difference in length between the chars between nfd and

         * nsb, and the chars between ofd and osb, and is thus the number of

         * characters to delete if < 0 (new is shorter than old, as above),

         * or insert (new is longer than short).

         *

         * sx is the same for the second differences.

         */

	/*

         * if we have a net insert on the first difference, AND inserting the

         * net amount ((nsb-nfd) - (osb-ofd)) won't push the last useful

         * character (which is ne if nls != ne, otherwise is nse) off the edge

	 * of the screen (el->el_terminal.t_size.h) else we do the deletes first

	 * so that we keep everything we need to.

         */

	/*

         * if the last same is the same like the end, there is no last same

         * part, otherwise we want to keep the last same part set p to the

         * last useful old character

         */

	/*

         * if (There is a diffence in the beginning) && (we need to insert

         *   characters) && (the number of characters to insert is less than

         *   the term width)

	 *	We need to do an insert!

	 * else if (we need to delete characters)

	 *	We need to delete characters!

	 * else

	 *	No insert or delete

         */

		ELRE_DEBUG(1,

		    (__F, "first diff insert at %td...\r\n", nfd - new));

		/*

		 * Move to the first char to insert, where the first diff is.

		 */

		/*

		 * Check if we have stuff to keep at end

		 */

			ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n"));

			/*

		         * insert fx chars of new starting at nfd

		         */

				ELRE_DEBUG(!EL_CAN_INSERT, (__F,

				"ERROR: cannot insert in early first diff\n"));

			}

			/*

		         * write (nsb-nfd) - fx chars of new starting at

		         * (nfd + fx)

			 */

		} else {

			ELRE_DEBUG(1, (__F, "without anything to save\r\n"));

			len = (size_t)(nsb - nfd);

			/*

		         * Done

		         */

		}

		ELRE_DEBUG(1,

		    (__F, "first diff delete at %td...\r\n", ofd - old));

		/*

		 * move to the first char to delete where the first diff is

		 */

		/*

		 * Check if we have stuff to save

		 */

			ELRE_DEBUG(1, (__F, "with stuff to save at end\r\n"));

			/*

		         * fx is less than zero *always* here but we check

		         * for code symmetry

		         */

				ELRE_DEBUG(!EL_CAN_DELETE, (__F,

				    "ERROR: cannot delete in first diff\n"));

			}

			/*

		         * write (nsb-nfd) chars of new starting at nfd

		         */

			len = (size_t) (nsb - nfd);

		} else {

			ELRE_DEBUG(1, (__F,

			    "but with nothing left to save\r\n"));

			/*

		         * write (nsb-nfd) chars of new starting at nfd

		         */

			/*

		         * Done

		         */

		}

		fx = 0;

		ELRE_DEBUG(1, (__F,

		    "second diff delete at %td...\r\n", (ose - old) + fx));

		/*

		 * Check if we have stuff to delete

		 */

		/*

		 * fx is the number of characters inserted (+) or deleted (-)

		 */

		/*

		 * Check if we have stuff to save

		 */

			ELRE_DEBUG(1, (__F, "with stuff to save at end\r\n"));

			/*

		         * Again a duplicate test.

		         */

				ELRE_DEBUG(!EL_CAN_DELETE, (__F,

				    "ERROR: cannot delete in second diff\n"));

			}

			/*

		         * write (nls-nse) chars of new starting at nse

		         */

			ELRE_DEBUG(1, (__F,

			    "but with nothing left to save\r\n"));

		}

	}

	/*

         * if we have a first insert AND WE HAVEN'T ALREADY DONE IT...

         */

		ELRE_DEBUG(1, (__F, "late first diff insert at %td...\r\n",

		    nfd - new));

		/*

		 * Check if we have stuff to keep at the end

		 */

			ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n"));

			/*

		         * We have to recalculate fx here because we set it

		         * to zero above as a flag saying that we hadn't done

		         * an early first insert.

		         */

			fx = (int)((nsb - nfd) - (osb - ofd));

				/*

				 * insert fx chars of new starting at nfd

				 */

				ELRE_DEBUG(!EL_CAN_INSERT, (__F,

				 "ERROR: cannot insert in late first diff\n"));

			}

			/*

		         * write (nsb-nfd) - fx chars of new starting at

		         * (nfd + fx)

			 */

			ELRE_DEBUG(1, (__F, "without anything to save\r\n"));

			len = (size_t) (nsb - nfd);

		}

	}

	/*

         * line is now NEW up to nse

         */

		ELRE_DEBUG(1, (__F,

		    "second diff insert at %d...\r\n", (int)(nse - new)));

			ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n"));

				/* insert sx chars of new starting at nse */

				ELRE_DEBUG(!EL_CAN_INSERT, (__F,

				    "ERROR: cannot insert in second diff\n"));

			}

			/*

		         * write (nls-nse) - sx chars of new starting at

			 * (nse + sx)

		         */

			ELRE_DEBUG(1, (__F, "without anything to save\r\n"));

			/*

	                 * No need to do a clear-to-end here because we were

	                 * doing a second insert, so we will have over

	                 * written all of the old string.

		         */

		}

	}

	ELRE_DEBUG(1, (__F, "done.\r\n"));

}

/* re__copy_and_pad():

 *	Copy string and pad with spaces

 */

static void

re__copy_and_pad(wchar_t *dst, const wchar_t *src, size_t width)

{

	size_t i;

			break;

	}

}

/* re_refresh_cursor():

 *	Move to the new cursor position

 */

protected void

re_refresh_cursor(EditLine *el)

{

	wchar_t *cp;

	int h, v, th, w;