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BUFFER.C
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C/C++ Source or Header
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1988-08-23
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15KB
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584 lines
/*
* Buffer handling.
*/
#include "def.h"
#include "kbd.h" /* needed for modes */
static RSIZE itor();
/*
* 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 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 BUFFER *bp;
register WINDOW *wp;
register int s;
char bufn[NBUFN];
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 BUFFER *bp;
register BUFFER *bp1;
register BUFFER *bp2;
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 == 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. */
bp1 = bheadp;
while (bp1 != bp) {
if (bp1->b_altb == bp)
bp1->b_altb = (bp->b_altb == bp1) ? NULL : bp->b_altb;
bp2 = bp1;
bp1 = bp1->b_bufp;
}
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 BUFFER *bp;
register WINDOW *wp;
BUFFER *makelist();
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).
*/
BUFFER *
makelist() {
register char *cp1;
register char *cp2;
register int c;
register BUFFER *bp;
LINE *lp;
register RSIZE nbytes;
BUFFER *blp;
char b[6+1];
char line[128];
if ((blp = bfind("*Buffer List*", TRUE)) == NULL) return NULL;
if (bclear(blp) != TRUE) return NULL;
blp->b_flag &= ~BFCHG; /* Blow away old. */
(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;
bp = bheadp; /* For all buffers */
while (bp != NULL) {
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;
bp = bp->b_bufp;
}
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 BUFFER *bp; char *text; {
register LINE *lp;
register int i;
register int ntext;
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 CANTHAPPEN
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