/*
 * File commands. 
 */
#include	"no_backup.h"
#include	"makebackup.h"

#include	"def.h"
#include	"line.h"
#include	"buffer.h"
#include	"window.h"

#ifdef	ANSI
#include <string.h>
#include <stdlib.h>
#endif

struct buffer  *findbuffer();
VOID 
makename(), upmodes();
static char    *itos();
#ifndef		NO_PROTO
static char    *itos 
PROTO((char *bufp, unsigned int num));
#endif

/*
 * insert a file into the current buffer. Real easy - just call the
 * insertfile routine with the file name. 
 */
/* ARGSUSED */
fileinsert(f, n)
{
	register int    s;
	char            fname[NFILEN];

	if ((s = ereply("Insert file: ", fname, NFILEN)) != TRUE)
		return (s);
	return insertfile(adjustname(fname), (char *) NULL);
	/* don't set buffer name */
}

/*
 * Select a file for editing. Look around to see if you can find the fine in
 * another buffer; if you can find it just switch to the buffer. If you
 * cannot find the file, create a new buffer, read in the text, and switch to
 * the new buffer. 
 */
/* ARGSUSED */
filevisit(f, n)
{
	register struct buffer *bp;
	int             s;
	char            fname[NFILEN];
	char           *adjf;

	if ((s = ereply("Find file: ", fname, NFILEN)) != TRUE)
		return s;
	adjf = adjustname(fname);
	if ((bp = findbuffer(adjf)) == NULL)
		return FALSE;
	curbp = bp;
	if (showbuffer(bp, curwp, WFHARD) != TRUE)
		return FALSE;
	if (bp->b_fname[0] == 0)
		return readin(adjf);	/* Read it in.		 */
	return TRUE;
}
/*
 * Pop to a file in the other window. Same as last function, just popbuf
 * instead of showbuffer. 
 */
/* ARGSUSED */
poptofile(f, n)
{
	register struct buffer *bp;
	register struct window *wp;
	int             s;
	char            fname[NFILEN];
	char           *adjf;

	if ((s = ereply("Find file in other window: ", fname, NFILEN)) != TRUE)
		return s;
	adjf = adjustname(fname);
	if ((bp = findbuffer(adjf)) == NULL)
		return FALSE;
	if ((wp = popbuf(bp)) == NULL)
		return FALSE;
	curbp = bp;
	curwp = wp;
	if (bp->b_fname[0] == 0)
		return readin(adjf);	/* Read it in.		 */
	return TRUE;
}

/*
 * reads the file being edited back into the buffer, throwing away changes. 
 */
revertbuffer(f, n)
{
	int             s;
	char            prompt[NLINE];

	if (curbp->b_fname[0] == '\0') {
		ewprintf("Buffer does not seem to be associated with any file");
		return TRUE;
	}
	strcpy(prompt, "Revert buffer from file ");
	strcat(prompt, curbp->b_fname);
	if ((s = eyesno(prompt)) != TRUE)
		return s;
	curbp->b_flag &= ~BFCHG;/* Don't ask, just chung it */
	readin(curbp->b_fname);
}

/*
 * given a file name, either find the buffer it uses, or create a new empty
 * buffer to put it in. 
 */
struct buffer  *
findbuffer(fname)
	char           *fname;
{
	register struct buffer *bp;
	char            bname[NBUFN], *cp;
	unsigned        count = 0;

	for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
		if (fncmp(bp->b_fname, fname) == 0)
			return bp;
	}
	makename(bname, fname);	/* New buffer name.	 */
	cp = bname + strlen(bname);
	while (bfind(bname, FALSE) != NULL) {
		*cp = '<';	/* add "<count>" to then name	 */
		(VOID) strcpy(itos(cp, count += 1) + 1, ">");
	}
	return bfind(bname, TRUE);
}

/*
 * Put the decimal representation of num into a buffer.  Hacked to be faster,
 * smaller, and less general. 
 */
static char    *
itos(bufp, num)
	char           *bufp;
	unsigned        num;
{
	if (num >= 10) {
		bufp = itos(bufp, num / 10);
		num %= 10;
	}
	*++bufp = '0' + num;
	return bufp;
}

/*
 * Read the file "fname" into the current buffer. Make all of the text in the
 * buffer go away, after checking for unsaved changes. This is called by the
 * "read" command, the "visit" command, and the mainline (for "uemacs file"). 
 */
readin(fname)
	char           *fname;
{
	register int    status;
	register struct window *wp;

	if (bclear(curbp) != TRUE)	/* Might be old.	 */
		return TRUE;
	status = insertfile(fname, fname);
#ifdef	FOOB
	curbp->b_foob = getfoob(fname);
#endif
	curbp->b_flag &= ~BFCHG;/* No change.		 */
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_bufp == curbp) {
			wp->w_dotp = wp->w_linep = lforw(curbp->b_linep);
			wp->w_doto = 0;
			wp->w_markp = NULL;
			wp->w_marko = 0;
		}
	}
	return status;
}
/*
 * insert a file in the current buffer, after dot. Set mark at the end of the
 * text inserted, point at the beginning. Return a standard status. Print a
 * summary (lines read, error message) out as well. If the BACKUP conditional
 * is set, then this routine also does the read end of backup processing. The
 * BFBAK flag, if set in a buffer, says that a backup should be taken. It is
 * set when a file is read in, but not on a new file (you don't need to make
 * a backup copy of nothing). 
 */
insertfile(fname, newname)
	char            fname[], newname[];
{
	register struct line *lp1;
	register struct line *lp2;
	register struct window *wp;
	int             nbytes;
	struct line    *olp;	/* Line we started at */
	int             opos;	/* and offset into it */
	int             s, nline;
	struct buffer  *bp;
	char            line[NLINE];

	bp = curbp;		/* Cheap.		 */
	if (newname != (char *) NULL)
		(VOID) strcpy(bp->b_fname, newname);
	if ((s = ffropen(fname)) == FIOERR)	/* Hard file open.	 */
		goto out;
	if (s == FIOFNF) {	/* File not found.	 */
		if (newname != NULL)
			ewprintf("(New file)");
		else
			ewprintf("(File not found)");
		goto out;
	}
	opos = curwp->w_doto;
	/* Open a new line, at point, and start inserting after it */
	(VOID) lnewline();
	olp = lback(curwp->w_dotp);
	if (olp == curbp->b_linep) {
		/* if at end of buffer, create a line to insert before */
		(VOID) lnewline();
		curwp->w_dotp = lback(curwp->w_dotp);
	}
	nline = 0;		/* Don't count fake line at end */
	while ((s = ffgetline(line, NLINE, &nbytes)) != FIOERR) {
		switch (s) {
		case FIOSUC:
			++nline;
			/* and continue */
		case FIOEOF:	/* the last line of the file		 */
			if ((lp1 = lalloc(nbytes)) == NULL) {
				s = FIOERR;	/* Keep message on the	 */
				goto endoffile;	/* display.		 */
			}
			bcopy(line, &ltext(lp1)[0], nbytes);
	lineread:	lp2 = lback(curwp->w_dotp);
			lp2->l_fp = lp1;
			lp1->l_fp = curwp->w_dotp;
			lp1->l_bp = lp2;
			curwp->w_dotp->l_bp = lp1;
			if (s == FIOEOF)
				goto endoffile;
			break;
		case FIOLONG:{	/* a line to long to fit in our buffer	 */
				char           *cp;
				char           *cp2 = 0;	/* For lint */
				int             i;

				nbytes = 0;
				for (;;) {
					if ((cp = (char *) malloc((unsigned) (nbytes + NLINE))) == NULL) {
						ewprintf("Could not allocate %d bytes",
							 nbytes + NLINE);
						s = FIOERR;
						if (nbytes)
							free(cp2);
						goto endoffile;
					}
					if (nbytes) {
						bcopy(cp2, cp, nbytes);
						free(cp2);
					}
					bcopy(line, cp + nbytes, NLINE);
					nbytes += NLINE;
					switch (s = ffgetline(line, NLINE, &i)) {
					case FIOERR:
						free(cp);
						goto endoffile;
					case FIOLONG:
						cp2 = cp;
						break;
					case FIOEOF:
					case FIOSUC:
						if ((lp1 = lalloc(nbytes + i)) == NULL) {
							s = FIOERR;
							free(cp);
							goto endoffile;
						}
						bcopy(cp, &ltext(lp1)[0], nbytes);
						bcopy(line, &ltext(lp1)[nbytes], i);
						goto lineread;
					}
				}
			}
		default:
			ewprintf("Unknown code %d reading file", s);
			s = FIOERR;
			break;
		}
	}
endoffile:
	(VOID) ffclose();	/* Ignore errors.	 */
	if (s == FIOEOF) {	/* Don't zap an error.	 */
		if (nline == 1)
			ewprintf("(Read 1 line)");
		else
			ewprintf("(Read %d lines)", nline);
	}
	/* Set mark at the end of the text */
	curwp->w_dotp = curwp->w_markp = lback(curwp->w_dotp);
	curwp->w_marko = llength(curwp->w_markp);
	(VOID) ldelnewline();
	curwp->w_dotp = olp;
	curwp->w_doto = opos;
	if (olp == curbp->b_linep)
		curwp->w_dotp = lforw(olp);
#ifndef NO_BACKUP
	if (newname != NULL)
		bp->b_flag |= BFCHG | BFBAK;	/* Need a backup.	 */
	else
		bp->b_flag |= BFCHG;
#else
	bp->b_flag |= BFCHG;
#endif
	/*
	 * if the insert was at the end of buffer, set lp1 to the end of
	 * buffer line, and lp2 to the beginning of the newly inserted text.
	 * (Otherwise lp2 is set to NULL.)  This is used below to set
	 * pointers in other windows correctly if they are also at the end of
	 * buffer. 
	 */
	lp1 = bp->b_linep;
	if (curwp->w_markp == lp1) {
		lp2 = curwp->w_dotp;
	} else {
		(VOID) ldelnewline();	/* delete extranious newline */
out:		lp2 = NULL;
	}
	for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
		if (wp->w_bufp == curbp) {
			wp->w_flag |= WFMODE | WFEDIT;
			if (wp != curwp && lp2 != NULL) {
				if (wp->w_dotp == lp1)
					wp->w_dotp = lp2;
				if (wp->w_markp == lp1)
					wp->w_markp = lp2;
				if (wp->w_linep == lp1)
					wp->w_linep = lp2;
			}
		}
	}
	return s != FIOERR;	/* False if error.	 */
}

/*
 * Take a file name, and from it fabricate a buffer name. This routine knows
 * about the syntax of file names on the target system. BDC1		left
 * scan delimiter. BDC2		optional second left scan delimiter. BDC3
 * ptional right scan delimiter. 
 */
VOID
makename(bname, fname)
	char            bname[];
char            fname[];
{
	register char  *cp1;
	register char  *cp2;

	cp1 = &fname[0];
	while (*cp1 != 0)
		++cp1;
	--cp1;			/* insure at least 1 character ! */
#ifdef	BDC2
	while (cp1 != &fname[0] && cp1[-1] != BDC1 && cp1[-1] != BDC2)
		--cp1;
#else
	while (cp1 != &fname[0] && cp1[-1] != BDC1)
		--cp1;
#endif
	cp2 = &bname[0];
#ifdef	BDC3
	while (cp2 != &bname[NBUFN - 1] && *cp1 != 0 && *cp1 != BDC3)
		*cp2++ = *cp1++;
#else
	while (cp2 != &bname[NBUFN - 1] && *cp1 != 0)
		*cp2++ = *cp1++;
#endif
	*cp2 = 0;
}

/*
 * Ask for a file name, and write the contents of the current buffer to that
 * file. Update the remembered file name and clear the buffer changed flag.
 * This handling of file names is different from the earlier versions, and is
 * more compatable with Gosling EMACS than with ITS EMACS. 
 */
/* ARGSUSED */
filewrite(f, n)
{
	register int    s, count = 0;
	char            fname[NFILEN], bname[NBUFN];
	register char  *adjfname, *cp;

	if ((s = ereply("Write file: ", fname, NFILEN)) != TRUE)
		return (s);
	adjfname = adjustname(fname);
	if ((s = writeout(curbp, adjfname)) == TRUE) {
		(VOID) strcpy(curbp->b_fname, adjfname);
		makename(bname, fname);
		cp = bname + strlen(bname);
		while (bfind(bname, FALSE) != NULL) {
			*cp = '<';
			strcpy(itos(cp, count += 1) + 1, ">");
		}
		if ((cp = (char *) malloc(strlen(bname) + 1)) == NULL)
			ewprintf("Couldn't get %d bytes", strlen(bname) + 1);
		else {
			free(curbp->b_bname);
			strcpy(cp, bname);
			curbp->b_bname = cp;
		}

#ifndef NO_BACKUP
		curbp->b_flag &= ~(BFBAK | BFCHG);
#else
		curbp->b_flag &= ~BFCHG;
#endif
		upmodes(curbp);
	}
	return s;
}

/*
 * Save the contents of the current buffer back into its associated file. 
 */
#ifndef NO_BACKUP
static int      makebackup = MAKEBACKUP;
#endif

/* ARGSUSED */
filesave(f, n)
{
	return buffsave(curbp);
}

/*
 * Save the contents of the buffer argument into its associated file. Do
 * nothing if there have been no changes (is this a bug, or a feature). Error
 * if there is no remembered file name. If this is the first write since the
 * read or visit, then a backup copy of the file is made. Allow user to
 * select whether or not to make backup files by looking at the value of
 * makebackup. 
 */
buffsave(bp)
	struct buffer  *bp;
{
	register int    s;

	if ((bp->b_flag & BFCHG) == 0) {	/* Return, no changes.	 */
		ewprintf("(No changes need to be saved)");
		return TRUE;
	}
	if (bp->b_fname[0] == '\0') {	/* Must have a name.	 */
		ewprintf("No file name");
		return (FALSE);
	}
#ifndef NO_BACKUP
	if (makebackup && (bp->b_flag & BFBAK)) {
		s = fbackupfile(bp->b_fname);
		if (s == ABORT)	/* Hard error.		 */
			return FALSE;
		if (s == FALSE	/* Softer error.	 */
		    && (s = eyesno("Backup error, save anyway")) != TRUE)
			return s;
	}
#endif
	if ((s = writeout(bp, bp->b_fname)) == TRUE) {
#ifndef NO_BACKUP
		bp->b_flag &= ~(BFCHG | BFBAK);
#else
		bp->b_flag &= ~BFCHG;
#endif
		upmodes(bp);
	}
	return s;
}

#ifndef NO_BACKUP
/*
 * Since we don't have variables (we probably should) this is a command
 * processor for changing the value of the make backup flag.  If no argument
 * is given, sets makebackup to true, so backups are made.  If an argument is
 * given, no backup files are made when saving a new version of a file. Only
 * used when BACKUP is #defined. 
 */
/* ARGSUSED */
makebkfile(f, n)
{
	if (f & FFARG)
		makebackup = n > 0;
	else
		makebackup = !makebackup;
	ewprintf("Backup files %sabled", makebackup ? "en" : "dis");
	return TRUE;
}
#endif

/*
 * This function performs the details of file writing; writing the file in
 * buffer bp to file fn. Uses the file management routines in the "fileio.c"
 * package. Most of the grief is checking of some sort. 
 */
writeout(bp, fn)
	register struct buffer *bp;
	char           *fn;
{
	register int    s;

	if ((s = ffwopen(fn)) != FIOSUC)	/* Open writes message. */
		return (FALSE);
	s = ffputbuf(bp);
	if (s == FIOSUC) {	/* No write error.	 */
		s = ffclose();
		if (s == FIOSUC)
			ewprintf("Wrote %s", fn);
	} else			/* Ignore close error	 */
		(VOID) ffclose();	/* if a write error.	 */
#ifdef	FOOB
	putfoob(fn, bp->b_foob);
#endif
	return s == FIOSUC;
}

/*
 * Tag all windows for bp (all windows if bp NULL) as needing their mode line
 * updated. 
 */
VOID
upmodes(bp)
	register struct buffer *bp;
{
	register struct window *wp;

	for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
		if (bp == NULL || wp->w_bufp == bp)
			wp->w_flag |= WFMODE;
}