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buffer.c
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C/C++ Source or Header
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1990-05-23
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15KB
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626 lines
/*
* Buffer handling.
*/
#include "no_help.h"
#include "def.h"
#include "line.h"
#include "buffer.h"
#include "window.h"
#include "foob.h"
#ifdef ANSI
#include <stdlib.h>
#include <string.h>
#endif
static RSIZE itor
PROTO((char buf[], int, RSIZE));
/*
* Attach a buffer to a window. The values of dot and mark come from the
* buffer if the use count is 0. Otherwise, they come from some other window.
* *scratch* is the default alternate buffer.
*/
/* ARGSUSED */
usebuffer(f, n)
{
register struct buffer *bp;
register int s;
char bufn[NBUFN];
/* Get buffer to use from user */
if ((curbp->b_altb == NULL)
&& ((curbp->b_altb = bfind("*scratch*", TRUE)) == NULL))
s = eread("Switch to buffer: ", bufn, NBUFN, EFNEW | EFBUF);
else
s = eread("Switch to buffer: (default %s) ", bufn, NBUFN,
EFNEW | EFBUF, curbp->b_altb->b_bname);
if (s == ABORT)
return s;
if (s == FALSE && curbp->b_altb != NULL)
bp = curbp->b_altb;
else if ((bp = bfind(bufn, TRUE)) == NULL)
return FALSE;
/* and put it in current window */
curbp = bp;
return showbuffer(bp, curwp, WFFORCE | WFHARD);
}
/*
* pop to buffer asked for by the user.
*/
/* ARGSUSED */
poptobuffer(f, n)
{
register struct buffer *bp;
register struct window *wp;
register int s;
char bufn[NBUFN];
struct window *popbuf();
/* Get buffer to use from user */
if ((curbp->b_altb == NULL)
&& ((curbp->b_altb = bfind("*scratch*", TRUE)) == NULL))
s = eread("Switch to buffer in other window: ", bufn, NBUFN,
EFNEW | EFBUF);
else
s = eread("Switch to buffer in other window: (default %s) ",
bufn, NBUFN, EFNEW | EFBUF, curbp->b_altb->b_bname);
if (s == ABORT)
return s;
if (s == FALSE && curbp->b_altb != NULL)
bp = curbp->b_altb;
else if ((bp = bfind(bufn, TRUE)) == NULL)
return FALSE;
/* and put it in a new window */
if ((wp = popbuf(bp)) == NULL)
return FALSE;
curbp = bp;
curwp = wp;
return TRUE;
}
/*
* Dispose of a buffer, by name. Ask for the name. Look it up (don't get too
* upset if it isn't there at all!). Clear the buffer (ask if the buffer has
* been changed). Then free the header line and the buffer header. Bound to
* "C-X K".
*/
/* ARGSUSED */
killbuffer(f, n)
{
register struct buffer *bp;
register struct buffer *bp1;
register struct buffer *bp2;
struct window *wp;
register int s;
char bufn[NBUFN];
if ((s = eread("Kill buffer: (default %s) ", bufn, NBUFN, EFNEW | EFBUF,
curbp->b_bname)) == ABORT)
return (s);
else if (s == FALSE)
bp = curbp;
else if ((bp = bfind(bufn, FALSE)) == NULL)
return FALSE;
/*
* find some other buffer to display. try the alternate buffer, then
* the first different buffer in the buffer list. if there's
* only one buffer, create buffer *scratch* and make it the alternate
* buffer. return if *scratch* is only buffer
*/
if ((bp1 = bp->b_altb) == NULL || bp1 == bp) {
bp1 = (bp == bheadp) ? bp->b_bufp : bheadp;
if (bp1 == NULL) {
/* only one buffer. see if it's *scratch* */
if (bp == bfind("*scratch*", FALSE))
return FALSE;
/* create *scratch* for alternate buffer */
if ((bp1 = bfind("*scratch*", TRUE)) == NULL)
return FALSE;
}
}
if (bclear(bp) != TRUE)
return TRUE;
for (wp = wheadp; bp->b_nwnd > 0; wp = wp->w_wndp) {
if (wp->w_bufp == bp) {
bp2 = bp1->b_altb; /* save alternate buffer */
if (showbuffer(bp1, wp, WFMODE | WFFORCE | WFHARD) != NULL)
bp1->b_altb = bp2;
else
bp1 = bp2;
}
}
if (bp == curbp)
curbp = bp1;
free((char *) bp->b_linep); /* Release header line. */
bp2 = NULL; /* Find the header. */
for (bp1 = bheadp; bp1 != bp; bp1 = bp1->b_bufp) {
if (bp1->b_altb == bp)
bp1->b_altb = (bp->b_altb == bp1) ? NULL : bp->b_altb;
bp2 = bp1;
}
bp1 = bp1->b_bufp; /* Next one in chain. */
if (bp2 == NULL) /* Unlink it. */
bheadp = bp1;
else
bp2->b_bufp = bp1;
while (bp1 != NULL) { /* Finish with altb's */
if (bp1->b_altb == bp)
bp1->b_altb = (bp->b_altb == bp1) ? NULL : bp->b_altb;
bp1 = bp1->b_bufp;
}
free(bp->b_bname); /* Release name block */
free((char *) bp); /* Release buffer block */
return TRUE;
}
/*
* Save some buffers - just call anycb with the arg flag.
*/
/* ARGSUSED */
savebuffers(f, n)
{
if (anycb(f) == ABORT)
return ABORT;
return TRUE;
}
/*
* Display the buffer list. This is done in two parts. The "makelist" routine
* figures out the text, and puts it in a buffer. "popbuf" then pops the data
* onto the screen. Bound to "C-X C-B".
*/
/* ARGSUSED */
listbuffers(f, n)
{
register struct buffer *bp;
register struct window *wp;
struct buffer *makelist();
struct window *popbuf();
if ((bp = makelist()) == NULL || (wp = popbuf(bp)) == NULL)
return FALSE;
wp->w_dotp = bp->b_dotp;/* fix up if window already on screen */
wp->w_doto = bp->b_doto;
return TRUE;
}
/*
* This routine rebuilds the text for the list buffers command. Return TRUE
* if everything works. Return FALSE if there is an error (if there is no
* memory).
*/
struct buffer *
makelist()
{
register char *cp1;
register char *cp2;
register int c;
register struct buffer *bp;
struct line *lp;
register RSIZE nbytes;
struct buffer *blp;
char b[6 + 1];
char line[128];
if ((blp = bfind("*Buffer List*", TRUE)) == NULL)
return NULL;
blp->b_flag &= ~BFCHG; /* Blow away old. */
if (bclear(blp) != TRUE)
return NULL;
(VOID) strcpy(line, " MR Buffer");
cp1 = line + 10;
while (cp1 < line + 4 + NBUFN + 1)
*cp1++ = ' ';
(VOID) strcpy(cp1, "Size File");
if (addline(blp, line) == FALSE)
return NULL;
(VOID) strcpy(line, " -- ------");
cp1 = line + 10;
while (cp1 < line + 4 + NBUFN + 1)
*cp1++ = ' ';
(VOID) strcpy(cp1, "---- ----");
if (addline(blp, line) == FALSE)
return NULL;
for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
cp1 = &line[0]; /* Start at left edge */
*cp1++ = (bp == curbp) ? '.' : ' ';
*cp1++ = ((bp->b_flag & BFCHG) != 0) ? '*' : ' ';
*cp1++ = ' '; /* Gap. */
*cp1++ = ' ';
cp2 = &bp->b_bname[0]; /* Buffer name */
while ((c = *cp2++) != 0)
*cp1++ = c;
while (cp1 < &line[4 + NBUFN + 1])
*cp1++ = ' ';
nbytes = 0; /* Count bytes in buf. */
if (bp != blp) {
lp = lforw(bp->b_linep);
while (lp != bp->b_linep) {
nbytes += llength(lp) + 1;
lp = lforw(lp);
}
if (nbytes)
nbytes--; /* no bonus newline */
}
(VOID) itor(b, 6, nbytes); /* 6 digit buffer size. */
cp2 = &b[0];
while ((c = *cp2++) != 0)
*cp1++ = c;
*cp1++ = ' '; /* Gap.. */
cp2 = &bp->b_fname[0]; /* File name */
if (*cp2 != 0) {
while ((c = *cp2++) != 0) {
if (cp1 < &line[128 - 1])
*cp1++ = c;
}
}
*cp1 = 0; /* Add to the buffer. */
if (addline(blp, line) == FALSE)
return NULL;
}
blp->b_dotp = lforw(blp->b_linep); /* put dot at beginning of
* buffer */
blp->b_doto = 0;
return blp; /* All done */
}
/*
* Used above.
*/
static RSIZE
itor(buf, width, num)
register char buf[];
register int width;
register RSIZE num; {
register RSIZE r;
if (num / 10 == 0) {
buf[0] = (num % 10) + '0';
for (r = 1; r < width; buf[r++] = ' ');
buf[width] = '\0';
return 1;
} else {
buf[r = itor(buf, width, num / (RSIZE) 10)] =
(num % (RSIZE) 10) + '0';
return r + 1;
}
/* NOTREACHED */
}
/*
* The argument "text" points to a string. Append this line to the buffer.
* Handcraft the EOL on the end. Return TRUE if it worked and FALSE if you
* ran out of room.
*/
addline(bp, text)
register struct buffer *bp;
char *text;
{
register struct line *lp;
register int i;
register int ntext;
if (!text)
return FALSE;
ntext = strlen(text);
if ((lp = lalloc(ntext)) == NULL)
return FALSE;
for (i = 0; i < ntext; ++i)
lputc(lp, i, text[i]);
bp->b_linep->l_bp->l_fp = lp; /* Hook onto the end */
lp->l_bp = bp->b_linep->l_bp;
bp->b_linep->l_bp = lp;
lp->l_fp = bp->b_linep;
#ifdef notdef
if (bp->b_dotp == bp->b_linep) /* If "." is at the end */
bp->b_dotp = lp;/* move it to new line */
if (bp->b_markp == bp->b_linep) /* ditto for mark */
bp->b_markp = lp;
#endif
return TRUE;
}
/*
* Look through the list of buffers, giving the user a chance to save them.
* Return TRUE if there are any changed buffers afterwards. Buffers that
* don't have an associated file don't count. Return FALSE if there are no
* changed buffers.
*/
anycb(f)
{
register struct buffer *bp;
register int unsaved = FALSE, t, none = TRUE;
char prompt[NFILEN + 11];
for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
if (*(bp->b_fname) != '\0'
&& (bp->b_flag & BFCHG) != 0) {
(VOID) strcpy(prompt, "Save file ");
(VOID) strcpy(prompt + 10, bp->b_fname);
none = t = FALSE;
if (f == TRUE || (t = eyorn(prompt)) == TRUE)
t = buffsave(bp);
if (t == ABORT)
return t;
unsaved = unsaved || !t;
}
}
if (none) ewprintf("(No files need saving)");
return unsaved;
}
/*
* Search for a buffer, by name. If not found, and the "cflag" is TRUE,
* create a buffer and put it in the list of all buffers. Return pointer to
* the BUFFER block for the buffer.
*/
struct buffer *
bfind(bname, cflag)
register char *bname;
{
register struct buffer *bp;
register struct line *lp;
int i;
extern int defb_nmodes;
extern struct maps *defb_modes[PBMODES];
extern int defb_flag;
if (!bname)
return NULL;
bp = bheadp;
while (bp != NULL) {
if (fncmp(bname, bp->b_bname) == 0)
return bp;
bp = bp->b_bufp;
}
if (cflag != TRUE)
return NULL;
/* NOSTRICT */
if ((bp = (struct buffer *) malloc(sizeof(struct buffer))) == NULL) {
ewprintf("Can't get %d bytes", sizeof(struct buffer));
return NULL;
}
if ((bp->b_bname = (char *) malloc((unsigned) (strlen(bname) + 1))) == NULL) {
ewprintf("Can't get %d bytes", strlen(bname) + 1);
free((char *) bp);
return NULL;
}
if ((lp = lalloc(0)) == NULL) {
free(bp->b_bname);
free((char *) bp);
return NULL;
}
bp->b_altb = bp->b_bufp = NULL;
bp->b_dotp = lp;
bp->b_doto = 0;
bp->b_markp = NULL;
bp->b_marko = 0;
bp->b_flag = defb_flag;
bp->b_nwnd = 0;
bp->b_linep = lp;
bp->b_nmodes = defb_nmodes;
#ifdef FOOB
bp->b_foob = getfoob((char *) NULL);
#endif
i = 0;
do {
bp->b_modes[i] = defb_modes[i];
} while (i++ < defb_nmodes);
bp->b_fname[0] = '\0';
(VOID) strcpy(bp->b_bname, bname);
lp->l_fp = lp;
lp->l_bp = lp;
bp->b_bufp = bheadp;
bheadp = bp;
return bp;
}
/*
* This routine blows away all of the text in a buffer. If the buffer is
* marked as changed then we ask if it is ok to blow it away; this is to save
* the user the grief of losing text. The window chain is nearly always wrong
* if this gets called; the caller must arrange for the updates that are
* required. Return TRUE if everything looks good.
*/
bclear(bp)
register struct buffer *bp;
{
register struct line *lp;
register int s;
VOID lfree();
if ((bp->b_flag & BFCHG) != 0 /* Changed. */
&& (s = eyesno("Buffer modified; kill anyway")) != TRUE)
return (s);
bp->b_flag &= ~BFCHG; /* Not changed */
while ((lp = lforw(bp->b_linep)) != bp->b_linep)
lfree(lp);
bp->b_dotp = bp->b_linep; /* Fix "." */
bp->b_doto = 0;
bp->b_markp = NULL; /* Invalidate "mark" */
bp->b_marko = 0;
return TRUE;
}
/*
* Display the given buffer in the given window. Flags indicated action on
* redisplay.
*/
showbuffer(bp, wp, flags)
register struct buffer *bp;
register struct window *wp;
{
register struct buffer *obp;
struct window *owp;
if (wp->w_bufp == bp) { /* Easy case! */
wp->w_flag |= flags;
return TRUE;
}
/* First, dettach the old buffer from the window */
if ((bp->b_altb = obp = wp->w_bufp) != NULL) {
if (--obp->b_nwnd == 0) {
obp->b_dotp = wp->w_dotp;
obp->b_doto = wp->w_doto;
obp->b_markp = wp->w_markp;
obp->b_marko = wp->w_marko;
}
}
/* Now, attach the new buffer to the window */
wp->w_bufp = bp;
if (bp->b_nwnd++ == 0) {/* First use. */
wp->w_dotp = bp->b_dotp;
wp->w_doto = bp->b_doto;
wp->w_markp = bp->b_markp;
wp->w_marko = bp->b_marko;
} else
/* already on screen, steal values from other window */
for (owp = wheadp; owp != NULL; owp = wp->w_wndp)
if (wp->w_bufp == bp && owp != wp) {
wp->w_dotp = owp->w_dotp;
wp->w_doto = owp->w_doto;
wp->w_markp = owp->w_markp;
wp->w_marko = owp->w_marko;
break;
}
wp->w_flag |= WFMODE | flags;
return TRUE;
}
/*
* Pop the buffer we got passed onto the screen. Returns a status.
*/
struct window *
popbuf(bp)
register struct buffer *bp;
{
register struct window *wp;
if (bp->b_nwnd == 0) { /* Not on screen yet. */
if ((wp = wpopup()) == NULL)
return NULL;
} else
for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
if (wp->w_bufp == bp) {
wp->w_flag |= WFHARD | WFFORCE;
return wp;
}
if (showbuffer(bp, wp, WFHARD) != TRUE)
return NULL;
return wp;
}
/*
* Insert another buffer at dot. Very useful.
*/
/* ARGSUSED */
bufferinsert(f, n)
{
register struct buffer *bp;
register struct line *clp;
register int clo;
register int nline;
int s;
char bufn[NBUFN];
/* Get buffer to use from user */
if (curbp->b_altb != NULL)
s = eread("Insert buffer: (default %s) ", bufn, NBUFN,
EFNEW | EFBUF, &(curbp->b_altb->b_bname),
(char *) NULL);
else
s = eread("Insert buffer: ", bufn, NBUFN, EFNEW | EFBUF,
(char *) NULL);
if (s == ABORT)
return (s);
if (s == FALSE && curbp->b_altb != NULL)
bp = curbp->b_altb;
else if ((bp = bfind(bufn, FALSE)) == NULL)
return FALSE;
if (bp == curbp) {
ewprintf("Cannot insert buffer into self");
return FALSE;
}
/* insert the buffer */
nline = 0;
clp = lforw(bp->b_linep);
for (;;) {
for (clo = 0; clo < llength(clp); clo++)
if (linsert(1, lgetc(clp, clo)) == FALSE)
return FALSE;
if ((clp = lforw(clp)) == bp->b_linep)
break;
if (newline(FFRAND, 1) == FALSE) /* fake newline */
return FALSE;
nline++;
}
if (nline == 1)
ewprintf("[Inserted 1 line]");
else
ewprintf("[Inserted %d lines]", nline);
clp = curwp->w_linep; /* cosmetic adjustment */
if (curwp->w_dotp == clp) { /* for offscreen insert */
while (nline-- && lback(clp) != curbp->b_linep)
clp = lback(clp);
curwp->w_linep = clp; /* adjust framing. */
curwp->w_flag |= WFHARD;
}
return (TRUE);
}
/*
* Turn off the dirty bit on this buffer.
*/
/* ARGSUSED */
notmodified(f, n)
{
register struct window *wp;
curbp->b_flag &= ~BFCHG;
wp = wheadp; /* Update mode lines. */
while (wp != NULL) {
if (wp->w_bufp == curbp)
wp->w_flag |= WFMODE;
wp = wp->w_wndp;
}
ewprintf("Modification-flag cleared");
return TRUE;
}
#ifndef NO_HELP
/*
* Popbuf and set all windows to top of buffer. Currently only used by help
* functions.
*/
popbuftop(bp)
register struct buffer *bp;
{
register struct window *wp;
bp->b_dotp = lforw(bp->b_linep);
bp->b_doto = 0;
if (bp->b_nwnd != 0) {
for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
if (wp->w_bufp == bp) {
wp->w_dotp = bp->b_dotp;
wp->w_doto = 0;
wp->w_flag |= WFHARD;
}
}
return popbuf(bp) != NULL;
}
#endif