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Clean up the includes in mg.
This does the following:
Moves all POSIX headers from sysdef.h into the individual .c files so that
each file now only includes what it needs. All headers are properly sorted.
Moves the remainder of sysdef.h to other files (mostly def.h) and deletes
sysdef.h now that it's no longer contains anything.
Tweak a comment that references sysdef.h so that it no longer does that.
ok florian@

/*	$OpenBSD: line.c,v 1.55 2015/03/19 21:22:15 bcallah Exp $	*/

/* This file is in the public domain. */

/*
 *		Text line handling.
 *
 * The functions in this file are a general set of line management
 * utilities. They are the only routines that touch the text. They
 * also touch the buffer and window structures to make sure that the
 * necessary updating gets done.
 *
 * Note that this code only updates the dot and mark values in the window
 * list.  Since all the code acts on the current window, the buffer that
 * we are editing must be displayed, which means that "b_nwnd" is non-zero,
 * which means that the dot and mark values in the buffer headers are
 * nonsense.
 */

#include <sys/queue.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "def.h"

/*
 * Allocate a new line of size `used'.  lrealloc() can be called if the line
 * ever needs to grow beyond that.
 */
struct line *
lalloc(int used)
{
	struct line *lp;

	if ((lp = malloc(sizeof(*lp))) == NULL)
		return (NULL);
	lp->l_text = NULL;
	lp->l_size = 0;
	lp->l_used = used;	/* XXX */
	if (lrealloc(lp, used) == FALSE) {
		free(lp);
		return (NULL);
	}
	return (lp);
}

int
lrealloc(struct line *lp, int newsize)
{
	char *tmp;

	if (lp->l_size < newsize) {
		if ((tmp = realloc(lp->l_text, newsize)) == NULL)
			return (FALSE);
		lp->l_text = tmp;
		lp->l_size = newsize;
	}
	return (TRUE);
}

/*
 * Delete line "lp".  Fix all of the links that might point to it (they are
 * moved to offset 0 of the next line.  Unlink the line from whatever buffer
 * it might be in, and release the memory.  The buffers are updated too; the
 * magic conditions described in the above comments don't hold here.
 */
void
lfree(struct line *lp)
{
	struct buffer	*bp;
	struct mgwin	*wp;

	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_linep == lp)
			wp->w_linep = lp->l_fp;
		if (wp->w_dotp == lp) {
			wp->w_dotp = lp->l_fp;
			wp->w_doto = 0;
		}
		if (wp->w_markp == lp) {
			wp->w_markp = lp->l_fp;
			wp->w_marko = 0;
		}
	}
	for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
		if (bp->b_nwnd == 0) {
			if (bp->b_dotp == lp) {
				bp->b_dotp = lp->l_fp;
				bp->b_doto = 0;
			}
			if (bp->b_markp == lp) {
				bp->b_markp = lp->l_fp;
				bp->b_marko = 0;
			}
		}
	}
	lp->l_bp->l_fp = lp->l_fp;
	lp->l_fp->l_bp = lp->l_bp;
	if (lp->l_text != NULL)
		free(lp->l_text);
	free(lp);
}

/*
 * This routine is called when a character changes in place in the current
 * buffer. It updates all of the required flags in the buffer and window
 * system. The flag used is passed as an argument; if the buffer is being
 * displayed in more than 1 window we change EDIT to HARD. Set MODE if the
 * mode line needs to be updated (the "*" has to be set).
 */
void
lchange(int flag)
{
	struct mgwin	*wp;

	/* update mode lines if this is the first change. */
	if ((curbp->b_flag & BFCHG) == 0) {
		flag |= WFMODE;
		curbp->b_flag |= BFCHG;
	}
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_bufp == curbp) {
			wp->w_rflag |= flag;
			if (wp != curwp)
				wp->w_rflag |= WFFULL;
		}
	}
}

/*
 * Insert "n" bytes from "s" at the current location of dot.
 * In the easy case all that happens is the text is stored in the line.
 * In the hard case, the line has to be reallocated.  When the window list
 * is updated, take special care; I screwed it up once.  You always update
 * dot in the current window.  You update mark and a dot in another window
 * if it is greater than the place where you did the insert. Return TRUE
 * if all is well, and FALSE on errors.
 */
int
linsert_str(const char *s, int n)
{
	struct line	*lp1;
	struct mgwin	*wp;
	RSIZE	 i;
	int	 doto, k;

	if ((k = checkdirty(curbp)) != TRUE)
		return (k);

	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read only");
		return (FALSE);
	}

	if (!n)
		return (TRUE);

	lchange(WFFULL);

	/* current line */
	lp1 = curwp->w_dotp;

	/* special case for the end */
	if (lp1 == curbp->b_headp) {
		struct line *lp2, *lp3;

		/* now should only happen in empty buffer */
		if (curwp->w_doto != 0)
			panic("bug: linsert_str");
		/* allocate a new line */
		if ((lp2 = lalloc(n)) == NULL)
			return (FALSE);
		/* previous line */
		lp3 = lp1->l_bp;
		/* link in */
		lp3->l_fp = lp2;
		lp2->l_fp = lp1;
		lp1->l_bp = lp2;
		lp2->l_bp = lp3;
		for (i = 0; i < n; ++i)
			lp2->l_text[i] = s[i];
		for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
			if (wp->w_linep == lp1)
				wp->w_linep = lp2;
			if (wp->w_dotp == lp1)
				wp->w_dotp = lp2;
			if (wp->w_markp == lp1)
				wp->w_markp = lp2;
		}
		undo_add_insert(lp2, 0, n);
		curwp->w_doto = n;
		return (TRUE);
	}
	/* save for later */
	doto = curwp->w_doto;

	if ((lp1->l_used + n) > lp1->l_size) {
		if (lrealloc(lp1, lp1->l_used + n) == FALSE)
			return (FALSE);
	}
	lp1->l_used += n;
	if (lp1->l_used != n)
		memmove(&lp1->l_text[doto + n], &lp1->l_text[doto],
		    lp1->l_used - n - doto);

	/* Add the characters */
	for (i = 0; i < n; ++i)
		lp1->l_text[doto + i] = s[i];
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_dotp == lp1) {
			if (wp == curwp || wp->w_doto > doto)
				wp->w_doto += n;
		}
		if (wp->w_markp == lp1) {
			if (wp->w_marko > doto)
				wp->w_marko += n;
		}
	}
	undo_add_insert(curwp->w_dotp, doto, n);
	return (TRUE);
}

/*
 * Insert "n" copies of the character "c" at the current location of dot.
 * In the easy case all that happens is the text is stored in the line.
 * In the hard case, the line has to be reallocated.  When the window list
 * is updated, take special care; I screwed it up once.  You always update
 * dot in the current window.  You update mark and a dot in another window
 * if it is greater than the place where you did the insert. Return TRUE
 * if all is well, and FALSE on errors.
 */
int
linsert(int n, int c)
{
	struct line	*lp1;
	struct mgwin	*wp;
	RSIZE	 i;
	int	 doto;
	int s;

	if (!n)
		return (TRUE);

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read only");
		return (FALSE);
	}

	lchange(WFEDIT);

	/* current line */
	lp1 = curwp->w_dotp;

	/* special case for the end */
	if (lp1 == curbp->b_headp) {
		struct line *lp2, *lp3;

		/* now should only happen in empty buffer */
		if (curwp->w_doto != 0) {
			dobeep();
			ewprintf("bug: linsert");
			return (FALSE);
		}
		/* allocate a new line */
		if ((lp2 = lalloc(n)) == NULL)
			return (FALSE);
		/* previous line */
		lp3 = lp1->l_bp;
		/* link in */
		lp3->l_fp = lp2;
		lp2->l_fp = lp1;
		lp1->l_bp = lp2;
		lp2->l_bp = lp3;
		for (i = 0; i < n; ++i)
			lp2->l_text[i] = c;
		for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
			if (wp->w_linep == lp1)
				wp->w_linep = lp2;
			if (wp->w_dotp == lp1)
				wp->w_dotp = lp2;
			if (wp->w_markp == lp1)
				wp->w_markp = lp2;
		}
		undo_add_insert(lp2, 0, n);
		curwp->w_doto = n;
		return (TRUE);
	}
	/* save for later */
	doto = curwp->w_doto;

	if ((lp1->l_used + n) > lp1->l_size) {
		if (lrealloc(lp1, lp1->l_used + n) == FALSE)
			return (FALSE);
	}
	lp1->l_used += n;
	if (lp1->l_used != n)
		memmove(&lp1->l_text[doto + n], &lp1->l_text[doto],
		    lp1->l_used - n - doto);

	/* Add the characters */
	for (i = 0; i < n; ++i)
		lp1->l_text[doto + i] = c;
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_dotp == lp1) {
			if (wp == curwp || wp->w_doto > doto)
				wp->w_doto += n;
		}
		if (wp->w_markp == lp1) {
			if (wp->w_marko > doto)
				wp->w_marko += n;
		}
	}
	undo_add_insert(curwp->w_dotp, doto, n);
	return (TRUE);
}

/*
 * Do the work of inserting a newline at the given line/offset.
 * If mark is on the current line, we may have to move the markline
 * to keep line numbers in sync.
 * lnewline_at assumes the current buffer is writable. Checking for
 * this fact should be done by the caller.
 */
int
lnewline_at(struct line *lp1, int doto)
{
	struct line	*lp2;
	struct mgwin	*wp;
	int	 	 nlen, tcurwpdotline;

	lchange(WFFULL);

	curwp->w_bufp->b_lines++;
	/* Check if mark is past dot (even on current line) */
	if (curwp->w_markline > curwp->w_dotline  ||
	   (curwp->w_dotline == curwp->w_markline &&
	    curwp->w_marko >= doto))
		curwp->w_markline++;

	tcurwpdotline = curwp->w_dotline;

	/* If start of line, allocate a new line instead of copying */
	if (doto == 0) {
		/* new first part */
		if ((lp2 = lalloc(0)) == NULL)
			return (FALSE);
		lp2->l_bp = lp1->l_bp;
		lp1->l_bp->l_fp = lp2;
		lp2->l_fp = lp1;
		lp1->l_bp = lp2;
		for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
			if (wp->w_linep == lp1)
				wp->w_linep = lp2;
			if (wp->w_dotline >= tcurwpdotline)
				wp->w_dotline++;
		}
		undo_add_boundary(FFRAND, 1);
		undo_add_insert(lp2, 0, 1);
		undo_add_boundary(FFRAND, 1);
		return (TRUE);
	}

	/* length of new part */
	nlen = llength(lp1) - doto;

	/* new second half line */
	if ((lp2 = lalloc(nlen)) == NULL)
		return (FALSE);
	if (nlen != 0)
		bcopy(&lp1->l_text[doto], &lp2->l_text[0], nlen);
	lp1->l_used = doto;
	lp2->l_bp = lp1;
	lp2->l_fp = lp1->l_fp;
	lp1->l_fp = lp2;
	lp2->l_fp->l_bp = lp2;
	/* Windows */
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_dotp == lp1 && wp->w_doto >= doto) {
			wp->w_dotp = lp2;
			wp->w_doto -= doto;
			wp->w_dotline++;
		} else if (wp->w_dotline > tcurwpdotline)
			wp->w_dotline++;
		if (wp->w_markp == lp1 && wp->w_marko >= doto) {
			wp->w_markp = lp2;
			wp->w_marko -= doto;
		}
	}
	undo_add_boundary(FFRAND, 1);
	undo_add_insert(lp1, llength(lp1), 1);
	undo_add_boundary(FFRAND, 1);
	return (TRUE);
}

/*
 * Insert a newline into the buffer at the current location of dot in the
 * current window.
 */
int
lnewline(void)
{
	int s;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read only");
		return (FALSE);
	}
	return (lnewline_at(curwp->w_dotp, curwp->w_doto));
}

/*
 * This function deletes "n" bytes, starting at dot. (actually, n+1, as the
 * newline is included) It understands how to deal with end of lines, etc.
 * It returns TRUE if all of the characters were deleted, and FALSE if
 * they were not (because dot ran into the end of the buffer).
 * The "kflag" indicates either no insertion, or direction  of insertion
 * into the kill buffer.
 */
int
ldelete(RSIZE n, int kflag)
{
	struct line	*dotp;
	RSIZE		 chunk;
	struct mgwin	*wp;
	int		 doto;
	char		*cp1, *cp2;
	size_t		 len;
	char		*sv = NULL;
	int		 end;
	int		 s;
	int		 rval = FALSE;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read only");
		goto out;
	}
	len = n;
	if ((sv = calloc(1, len + 1)) == NULL)
		goto out;
	end = 0;

	undo_add_delete(curwp->w_dotp, curwp->w_doto, n, (kflag & KREG));

	while (n != 0) {
		dotp = curwp->w_dotp;
		doto = curwp->w_doto;
		/* Hit the end of the buffer */
		if (dotp == curbp->b_headp)
			goto out;
		/* Size of the chunk */
		chunk = dotp->l_used - doto;

		if (chunk > n)
			chunk = n;
		/* End of line, merge */
		if (chunk == 0) {
			if (dotp == blastlp(curbp))
				goto out;
			lchange(WFFULL);
			if (ldelnewline() == FALSE)
				goto out;
			end = strlcat(sv, "\n", len + 1);
			--n;
			continue;
		}
		lchange(WFEDIT);
		/* Scrunch text */
		cp1 = &dotp->l_text[doto];
		memcpy(&sv[end], cp1, chunk);
		end += chunk;
		sv[end] = '\0';
		for (cp2 = cp1 + chunk; cp2 < &dotp->l_text[dotp->l_used];
		    cp2++)
			*cp1++ = *cp2;
		dotp->l_used -= (int)chunk;
		for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
			if (wp->w_dotp == dotp && wp->w_doto >= doto) {
				/* NOSTRICT */
				wp->w_doto -= chunk;
				if (wp->w_doto < doto)
					wp->w_doto = doto;
			}
			if (wp->w_markp == dotp && wp->w_marko >= doto) {
				/* NOSTRICT */
				wp->w_marko -= chunk;
				if (wp->w_marko < doto)
					wp->w_marko = doto;
			}
		}
		n -= chunk;
	}
	if (kchunk(sv, (RSIZE)len, kflag) != TRUE)
		goto out;
	rval = TRUE;
out:
	free(sv);
	return (rval);
}

/*
 * Delete a newline and join the current line with the next line. If the next
 * line is the magic header line always return TRUE; merging the last line
 * with the header line can be thought of as always being a successful
 * operation.  Even if nothing is done, this makes the kill buffer work
 * "right". If the mark is past the dot (actually, markline > dotline),
 * decrease the markline accordingly to keep line numbers in sync.
 * Easy cases can be done by shuffling data around.  Hard cases
 * require that lines be moved about in memory.  Return FALSE on error and
 * TRUE if all looks ok. We do not update w_dotline here, as deletes are done
 * after moves.
 */
int
ldelnewline(void)
{
	struct line	*lp1, *lp2, *lp3;
	struct mgwin	*wp;
	int s;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read only");
		return (FALSE);
	}

	lp1 = curwp->w_dotp;
	lp2 = lp1->l_fp;
	/* at the end of the buffer */
	if (lp2 == curbp->b_headp)
		return (TRUE);
	/* Keep line counts in sync */
	curwp->w_bufp->b_lines--;
	if (curwp->w_markline > curwp->w_dotline)
		curwp->w_markline--;
	if (lp2->l_used <= lp1->l_size - lp1->l_used) {
		bcopy(&lp2->l_text[0], &lp1->l_text[lp1->l_used], lp2->l_used);
		for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
			if (wp->w_linep == lp2)
				wp->w_linep = lp1;
			if (wp->w_dotp == lp2) {
				wp->w_dotp = lp1;
				wp->w_doto += lp1->l_used;
			}
			if (wp->w_markp == lp2) {
				wp->w_markp = lp1;
				wp->w_marko += lp1->l_used;
			}
		}
		lp1->l_used += lp2->l_used;
		lp1->l_fp = lp2->l_fp;
		lp2->l_fp->l_bp = lp1;
		free(lp2);
		return (TRUE);
	}
	if ((lp3 = lalloc(lp1->l_used + lp2->l_used)) == NULL)
		return (FALSE);
	bcopy(&lp1->l_text[0], &lp3->l_text[0], lp1->l_used);
	bcopy(&lp2->l_text[0], &lp3->l_text[lp1->l_used], lp2->l_used);
	lp1->l_bp->l_fp = lp3;
	lp3->l_fp = lp2->l_fp;
	lp2->l_fp->l_bp = lp3;
	lp3->l_bp = lp1->l_bp;
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_linep == lp1 || wp->w_linep == lp2)
			wp->w_linep = lp3;
		if (wp->w_dotp == lp1)
			wp->w_dotp = lp3;
		else if (wp->w_dotp == lp2) {
			wp->w_dotp = lp3;
			wp->w_doto += lp1->l_used;
		}
		if (wp->w_markp == lp1)
			wp->w_markp = lp3;
		else if (wp->w_markp == lp2) {
			wp->w_markp = lp3;
			wp->w_marko += lp1->l_used;
		}
	}
	free(lp1);
	free(lp2);
	return (TRUE);
}

/*
 * Replace plen characters before dot with argument string.  Control-J
 * characters in st are interpreted as newlines.  There is a casehack
 * disable flag (normally it likes to match case of replacement to what
 * was there).
 */
int
lreplace(RSIZE plen, char *st)
{
	RSIZE	rlen;	/* replacement length		 */
	int s;

	if ((s = checkdirty(curbp)) != TRUE)
		return (s);
	if (curbp->b_flag & BFREADONLY) {
		dobeep();
		ewprintf("Buffer is read only");
		return (FALSE);
	}
	undo_boundary_enable(FFRAND, 0);

	(void)backchar(FFARG | FFRAND, (int)plen);
	(void)ldelete(plen, KNONE);

	rlen = strlen(st);
	region_put_data(st, rlen);
	lchange(WFFULL);

	undo_boundary_enable(FFRAND, 1);
	return (TRUE);
}

/*
 * Allocate and return the supplied line as a C string
 */
char *
linetostr(const struct line *ln)
{
	int	 len;
	char	*line;

	len = llength(ln);
	if (len == INT_MAX)  /* (len + 1) overflow */
		return (NULL);

	if ((line = malloc(len + 1)) == NULL)
		return (NULL);

	(void)memcpy(line, ltext(ln), len);
	line[len] = '\0';

	return (line);
}