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/*

 * Copyright (c) 1980 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#if	!defined(lint) && defined(DOSCCS)

static char *sccsid = "@(#)ex_temp.c	7.5.1.1 (Berkeley) 8/12/86";

#endif

#include "ex.h"

#include "ex_temp.h"

#include "ex_vis.h"

#include "ex_tty.h"

void rbflush();

void  blkio(short , char * , int (*f)());

/*

 * Editor temporary file routines.

 * Very similar to those of ed, except uses 2 input buffers.

 */

#define	READ	0

#define	WRITE	1

char	tfname[40];

char	rfname[40];

int	havetmp;

short	tfile = -1;

short	rfile = -1;

void

fileinit()

{

	register char *p;

	register int i, j;

	struct stat stbuf;

	if (tline == INCRMT * (HBLKS+2))

		return;

	cleanup(0);

	close(tfile);

	tline = INCRMT * (HBLKS+2);

	blocks[0] = HBLKS;

	blocks[1] = HBLKS+1;

	blocks[2] = -1;

	dirtcnt = 0;

	iblock = -1;

	iblock2 = -1;

	oblock = -1;

	strcpy(tfname, svalue(DIRECTORY));

	if (stat(tfname, &stbuf)) {

dumbness:

		if (setexit() == 0)

			filioerr(tfname);

		else

			putNFL();

		cleanup(1);

		exit(1);

	}

	if ((stbuf.st_mode & S_IFMT) != S_IFDIR) {

		errno = ENOTDIR;

		goto dumbness;

	}

	ichanged = 0;

	ichang2 = 0;

	ignore(strcat(tfname, "/ExXXXXX"));

	for (p = strend(tfname), i = 5, j = getpid(); i > 0; i--, j /= 10)

		*--p = j % 10 | '0';

	tfile = creat(tfname, 0600);

	if (tfile < 0)

		goto dumbness;

#ifdef VMUNIX

	{

		extern stilinc;		/* see below */

		stilinc = 0;

	}

#endif

	havetmp = 1;

	close(tfile);

	tfile = open(tfname, 2);

	if (tfile < 0)

		goto dumbness;

/* 	brk((char *)fendcore); */

}

cleanup(all)

	bool all;

{

	if (all) {

		putpad(TE);

		flush();

	}

	if (havetmp)

		unlink(tfname);

	havetmp = 0;

	if (all && rfile >= 0) {

		unlink(rfname);

		close(rfile);

		rfile = -1;

	}

}

getline(tl)

	line tl;

{

	register char *bp, *lp;

	register int nl;

	lp = linebuf;

	bp = getblock(tl, READ);

	nl = nleft;

	tl &= ~OFFMSK;

	while (*lp++ = *bp++)

		if (--nl == 0) {

			bp = getblock(tl += INCRMT, READ);

			nl = nleft;

		}

}

putline()

{

	register char *bp, *lp;

	register int nl;

	line tl;

	dirtcnt++;

	lp = linebuf;

	change();

	tl = tline;

	bp = getblock(tl, WRITE);

	nl = nleft;

	tl &= ~OFFMSK;

	while (*bp = *lp++) {

		if (*bp++ == '\n') {

			*--bp = 0;

			linebp = lp;

			break;

		}

		if (--nl == 0) {

			bp = getblock(tl += INCRMT, WRITE);

			nl = nleft;

		}

	}

	tl = tline;

	tline += (((lp - linebuf) + BNDRY - 1) >> SHFT) & 077776;

	return (tl);

}

int	read();

int	write();

char *

getblock(atl, iof)

	line atl;

	int iof;

{

	register int bno, off;

        register char *p1, *p2;

        register int n;

	bno = (atl >> OFFBTS) & BLKMSK;

	off = (atl << SHFT) & LBTMSK;

	if (bno >= NMBLKS)

		error(" Tmp file too large");

	nleft = BUFSIZ - off;

	if (bno == iblock) {

		ichanged |= iof;

		hitin2 = 0;

		return (ibuff + off);

	}

	if (bno == iblock2) {

		ichang2 |= iof;

		hitin2 = 1;

		return (ibuff2 + off);

	}

	if (bno == oblock)

		return (obuff + off);

	if (iof == READ) {

		if (hitin2 == 0) {

			if (ichang2) {

				blkio(iblock2, ibuff2, write);

			}

			ichang2 = 0;

			iblock2 = bno;

			blkio(bno, ibuff2, read);

			hitin2 = 1;

			return (ibuff2 + off);

		}

		hitin2 = 0;

		if (ichanged) {

			blkio(iblock, ibuff, write);

		}

		ichanged = 0;

		iblock = bno;

		blkio(bno, ibuff, read);

		return (ibuff + off);

	}

	if (oblock >= 0) {

			blkio(oblock, obuff, write);

	}

	oblock = bno;

	return (obuff + off);

}

#ifdef	VMUNIX

#define	INCORB	64

char	incorb[INCORB+1][BUFSIZ];

#define	pagrnd(a)	((char *)(((int)a)&~(BUFSIZ-1)))

int	stilinc;	/* up to here not written yet */

#endif

/*void

blkio(b, buf, iofcn)

	short b;

	char *buf;

	int (*iofcn)(); */

void  blkio(short b, char *buf , int (*iofcn)())

{

#ifdef VMUNIX

	if (b < INCORB) {

		if (iofcn == read) {

			bcopy(pagrnd(incorb[b+1]), buf, BUFSIZ);

			return;

		}

		bcopy(buf, pagrnd(incorb[b+1]), BUFSIZ);

		if (laste) {

			if (b >= stilinc)

				stilinc = b + 1;

			return;

		}

	} else if (stilinc)

		tflush();

#endif

	lseek(tfile, (long) (unsigned) b * BUFSIZ, 0);

	if ((*iofcn)(tfile, buf, BUFSIZ) != BUFSIZ)

		filioerr(tfname);

}

#ifdef VMUNIX

tlaste()

{

	if (stilinc)

		dirtcnt = 0;

}

tflush()

{

	int i = stilinc;

	stilinc = 0;

	lseek(tfile, (long) 0, 0);

	if (write(tfile, pagrnd(incorb[1]), i * BUFSIZ) != (i * BUFSIZ))

		filioerr(tfname);

}

#endif

/*

 * Synchronize the state of the temporary file in case

 * a crash occurs.

 */

void

synctmp()

{

	register int cnt;

	register line *a;

	register short *bp;

#ifdef VMUNIX

	if (stilinc)

		return;

#endif

	if (dol == zero)

		return;

	if (ichanged)

		blkio(iblock, ibuff, write);

	ichanged = 0;

	if (ichang2)

		blkio(iblock2, ibuff2, write);

	ichang2 = 0;

	if (oblock != -1)

		blkio(oblock, obuff, write);

	time(&H.Time);

	uid = getuid();

	*zero = (line) H.Time;

	for (a = zero, bp = blocks; a <= dol; a += BUFSIZ / sizeof *a, bp++) {

		if (*bp < 0) {

			tline = (tline + OFFMSK) &~ OFFMSK;

			*bp = ((tline >> OFFBTS) & BLKMSK);

			if (*bp > NMBLKS)

				error(" Tmp file too large");

			tline += INCRMT;

			oblock = *bp + 1;

			bp[1] = -1;

		}

		lseek(tfile, (long) (unsigned) *bp * BUFSIZ, 0);

		cnt = ((dol - a) + 2) * sizeof (line);

		if (cnt > BUFSIZ)

			cnt = BUFSIZ;

		if (write(tfile, (char *) a, cnt) != cnt) {

oops:

			*zero = 0;

			filioerr(tfname);

		}

		*zero = 0;

	}

	flines = lineDOL();

	lseek(tfile, 0l, 0);

	if (write(tfile, (char *) &H, sizeof H) != sizeof H)

		goto oops;

#ifdef notdef

	/*

	 * This will insure that exrecover gets as much

	 * back after a crash as is absolutely possible,

	 * but can result in pregnant pauses between commands

	 * when the TSYNC call is made, so...

	 */

	(void) fsync(tfile);

#endif

}

TSYNC()

{

	if (dirtcnt > MAXDIRT) {	/* mjm: 12 --> MAXDIRT */

#ifdef VMUNIX

		if (stilinc)

			tflush();

#endif

		dirtcnt = 0;

		synctmp();

	}

}

/*

 * Named buffer routines.

 * These are implemented differently than the main buffer.

 * Each named buffer has a chain of blocks in the register file.

 * Each block contains roughly 508 chars of text,

 * and a previous and next block number.  We also have information

 * about which blocks came from deletes of multiple partial lines,

 * e.g. deleting a sentence or a LISP object.

 *

 * We maintain a free map for the temp file.  To free the blocks

 * in a register we must read the blocks to find how they are chained

 * together.

 *

 * BUG:		The default savind of deleted lines in numbered

 *		buffers may be rather inefficient; it hasn't been profiled.

 */

struct	strreg {

	short	rg_flags;

	short	rg_nleft;

	short	rg_first;

	short	rg_last;

} strregs[('z'-'a'+1) + ('9'-'0'+1)], *strp;

struct	rbuf {

	short	rb_prev;

	short	rb_next;

	char	rb_text[BUFSIZ - 2 * sizeof (short)];

} *rbuf, KILLrbuf, putrbuf, YANKrbuf, regrbuf;

#ifdef VMUNIX

short	rused[256];

#else

short	rused[32];

#endif

short	rnleft;

short	rblock;

short	rnext;

char	*rbufcp;

regio(b, iofcn)

	short b;

	int (*iofcn)();

{

	if (rfile == -1) {

		strcpy(rfname, tfname);

		*(strend(rfname) - 7) = 'R';

		rfile = creat(rfname, 0600);

		if (rfile < 0)

oops:

			filioerr(rfname);

		close(rfile);

		rfile = open(rfname, 2);

		if (rfile < 0)

			goto oops;

	}

	lseek(rfile, (long) b * BUFSIZ, 0);

	if ((*iofcn)(rfile, rbuf, BUFSIZ) != BUFSIZ)

		goto oops;

	rblock = b;

}

REGblk()

{

	register int i, j, m;

	for (i = 0; i < sizeof rused / sizeof rused[0]; i++) {

		m = (rused[i] ^ 0177777) & 0177777;

		if (i == 0)

			m &= ~1;

		if (m != 0) {

			j = 0;

			while ((m & 1) == 0)

				j++, m >>= 1;

			rused[i] |= (1 << j);

#ifdef RDEBUG

			printf("allocating block %d\n", i * 16 + j);

#endif

			return (i * 16 + j);

		}

	}

	error("Out of register space (ugh)");

	/*NOTREACHED*/

}

struct	strreg *

mapreg(c)

	register int c;

{

	if (isupper(c))

		c = tolower(c);

	return (isdigit(c) ? &strregs[('z'-'a'+1)+(c-'0')] : &strregs[c-'a']);

}

int	shread();

KILLreg(c)

	register int c;

{

	register struct strreg *sp;

	rbuf = &KILLrbuf;

	sp = mapreg(c);

	rblock = sp->rg_first;

	sp->rg_first = sp->rg_last = 0;

	sp->rg_flags = sp->rg_nleft = 0;

	while (rblock != 0) {

#ifdef RDEBUG

		printf("freeing block %d\n", rblock);

#endif

		rused[rblock / 16] &= ~(1 << (rblock % 16));

		regio(rblock, shread);

		rblock = rbuf->rb_next;

	}

}

/*VARARGS*/

shread()

{

	struct front { short a; short b; };

	if (read(rfile, (char *) rbuf, sizeof (struct front)) == sizeof (struct front))

		return (sizeof (struct rbuf));

	return (0);

}

int	getREG();

void

putreg(c)

	char c;

{

	register line *odot = dot;

	register line *odol = dol;

	register int cnt;

	deletenone();

	appendnone();

	rbuf = &putrbuf;

	rnleft = 0;

	rblock = 0;

	rnext = mapreg(c)->rg_first;

	if (rnext == 0) {

		if (inopen) {

			splitw++;

			vclean();

			vgoto(WECHO, 0);

		}

		vreg = -1;

		error("Nothing in register %c", c);

	}

	if (inopen && partreg(c)) {

		if (!FIXUNDO) {

			splitw++; vclean(); vgoto(WECHO, 0); vreg = -1;

			error("Can't put partial line inside macro");

		}

		squish();

		addr1 = addr2 = dol;

	}

	cnt = append(getREG, addr2);

	if (inopen && partreg(c)) {

		unddol = dol;

		dol = odol;

		dot = odot;

		pragged(0);

	}

	killcnt(cnt);

	notecnt = cnt;

}

partreg(c)

	char c;

{

	return (mapreg(c)->rg_flags);

}

notpart(c)

	register int c;

{

	if (c)

		mapreg(c)->rg_flags = 0;

}

getREG()

{

	register char *lp = linebuf;

	register int c;

	for (;;) {

		if (rnleft == 0) {

			if (rnext == 0)

				return (EOF);

			regio(rnext, read);

			rnext = rbuf->rb_next;

			rbufcp = rbuf->rb_text;

			rnleft = sizeof rbuf->rb_text;

		}

		c = *rbufcp;

		if (c == 0)

			return (EOF);

		rbufcp++, --rnleft;

		if (c == '\n') {

			*lp++ = 0;

			return (0);

		}

		*lp++ = c;

	}

}

YANKreg(c)

	register int c;

{

	register line *addr;

	register struct strreg *sp;

	char savelb[LBSIZE];

	if (isdigit(c))

		kshift();

	if (islower(c))

		KILLreg(c);

	strp = sp = mapreg(c);

	sp->rg_flags = inopen && cursor && wcursor;

	rbuf = &YANKrbuf;

	if (sp->rg_last) {

		regio(sp->rg_last, read);

		rnleft = sp->rg_nleft;

		rbufcp = &rbuf->rb_text[sizeof rbuf->rb_text - rnleft];

	} else {

		rblock = 0;

		rnleft = 0;

	}

	strcpy(savelb,linebuf);

	for (addr = addr1; addr <= addr2; addr++) {

		getline(*addr);

		if (sp->rg_flags) {

			if (addr == addr2)

				*wcursor = 0;

			if (addr == addr1)

				strcpy(linebuf, cursor);

		}

		YANKline();

	}

	rbflush();

	killed();

	strcpy(linebuf,savelb);

}

kshift()

{

	register int i;

	KILLreg('9');

	for (i = '8'; i >= '0'; i--)

		copy(mapreg(i+1), mapreg(i), sizeof (struct strreg));

}

YANKline()

{

	register char *lp = linebuf;

	register struct rbuf *rp = rbuf;

	register int c;

	do {

		c = *lp++;

		if (c == 0)

			c = '\n';

		if (rnleft == 0) {

			rp->rb_next = REGblk();

			rbflush();

			rblock = rp->rb_next;

			rp->rb_next = 0;

			rp->rb_prev = rblock;

			rnleft = sizeof rp->rb_text;

			rbufcp = rp->rb_text;

		}

		*rbufcp++ = c;

		--rnleft;

	} while (c != '\n');

	if (rnleft)

		*rbufcp = 0;

}

void

rbflush()

{

	register struct strreg *sp = strp;

	if (rblock == 0)

		return;

	regio(rblock, write);

	if (sp->rg_first == 0)

		sp->rg_first = rblock;

	sp->rg_last = rblock;

	sp->rg_nleft = rnleft;

}

/* Register c to char buffer buf of size buflen */

regbuf(c, buf, buflen)

char c;

char *buf;

int buflen;

{

	register char *p, *lp;

	rbuf = &regrbuf;

	rnleft = 0;

	rblock = 0;

	rnext = mapreg(c)->rg_first;

	if (rnext==0) {

		*buf = 0;

		error("Nothing in register %c",c);

	}

	p = buf;

	while (getREG()==0) {

		for (lp=linebuf; *lp;) {

			if (p >= &buf[buflen])

				error("Register too long@to fit in memory");

			*p++ = *lp++;

		}

		*p++ = '\n';

	}

	if (partreg(c)) p--;

	*p = '\0';

	getDOT();

}

/*

 * Encryption routines.  These are essentially unmodified from ed.

 */