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Almathera Ten Pack 2: CDPD 1
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Almathera Ten on Ten - Disc 2: CDPD 1.iso
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026-050
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042
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mg1a
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buffer.c
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C/C++ Source or Header
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1995-03-13
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14KB
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553 lines
/*
* Buffer handling.
*/
#include "def.h"
/*
* 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.
*/
/*ARGSUSED*/
usebuffer(f, n, k) {
register BUFFER *bp;
register int s;
char bufn[NBUFN];
/* Get buffer to use from user */
if (curbp->b_altb != NULL)
s=eread("Switch to buffer: (default %s) ", bufn, NBUFN,
EFNEW|EFBUF,
#ifdef VARARGS
curbp->b_altb->b_bname
#else
&(curbp->b_altb->b_bname), (char *) NULL
#endif
) ;
else
s=eread("Switch to buffer: ", bufn, NBUFN, EFNEW|EFBUF
#ifndef VARARGS
,(char *) NULL
#endif
);
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, k) {
register BUFFER *bp;
register WINDOW *wp;
register int s;
char bufn[NBUFN];
/* Get buffer to use from user */
if (curbp->b_altb != NULL)
s=eread("Switch to buffer in other window: (default %s) ",
bufn, NBUFN, EFNEW|EFBUF,
#ifdef VARARGS
curbp->b_altb->b_bname
#else
&(curbp->b_altb->b_bname) ,(char *) NULL
#endif
) ;
else
s=eread("Switch to buffer in other window: ", bufn, NBUFN,
EFNEW|EFBUF
#ifndef VARARGS
, (char *) NULL
#endif
) ;
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, k) {
register BUFFER *bp;
register BUFFER *bp1;
register BUFFER *bp2;
register WINDOW *wp;
register int s;
char bufn[NBUFN];
if ((s=eread("Kill buffer: (default %s) ", bufn, NBUFN, EFNEW|EFBUF,
#ifdef VARARGS
curbp->b_bname
#else
&(curbp->b_bname)
#endif
)) == ABORT) return (s);
else if (s == FALSE) bp = curbp ;
else if ((bp=bfind(bufn, FALSE)) == NULL) return FALSE;
if (bp->b_nwnd != 0) {
if ((bp1 = bp->b_altb) == NULL) return FALSE;
if (bclear(bp) != TRUE) return TRUE;
for (wp = wheadp; bp->b_nwnd > 0; wp = wp->w_wndp) {
/* Special case - could use showbuf, but don't */
if (wp->w_bufp == bp) {
--bp->b_nwnd;
++bp1->b_nwnd;
wp->w_bufp = bp1 ;
wp->w_dotp = bp1->b_dotp;
wp->w_doto = bp1->b_doto;
wp->w_markp = bp1->b_markp;
wp->w_marko = bp1->b_marko;
wp->w_linep = bp1->b_linep;
wp->w_flag |= WFMODE|WFFORCE|WFHARD;
}
}
}
else if (bclear(bp) != TRUE) return TRUE;
if (bp == curbp) curbp = bp->b_altb;
free((char *) bp->b_linep); /* Release header line. */
bp1 = NULL; /* Find the header. */
bp2 = bheadp;
while (bp2 != bp) {
if (bp2->b_altb == bp)
bp2->b_altb = (bp->b_altb == bp2) ? NULL : bp->b_altb;
bp1 = bp2;
bp2 = bp2->b_bufp;
}
bp2 = bp2->b_bufp; /* Next one in chain. */
if (bp1 == NULL) /* Unlink it. */
bheadp = bp2;
else
bp1->b_bufp = bp2;
while (bp2 != NULL) { /* Finish with altb's */
if (bp2->b_altb == bp)
bp2->b_altb = (bp->b_altb == bp2) ? NULL : bp->b_altb;
bp2 = bp2->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, k) {
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, k) {
register BUFFER *bp;
register WINDOW *wp;
BUFFER *makelist();
WINDOW *popb();
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;
register 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);
}
}
(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 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;
}
}
/*
* 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((RSIZE) 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;
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;
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 BUFFER *bp;
register int s = FALSE, save = FALSE;
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);
if ((f == TRUE || (save = eyorn(prompt)) == TRUE)
&& writeout(bp, bp->b_fname) == TRUE) {
bp->b_flag &= ~BFCHG;
upmodes(bp);
} else s = TRUE;
if (save == ABORT) return (save);
save = TRUE;
}
}
if (save == FALSE && kbdmop == NULL)
ewprintf("(No files need saving)");
return s;
}
/*
* 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.
*/
BUFFER *
bfind(bname, cflag) register char *bname; {
register BUFFER *bp;
char *malloc();
register LINE *lp;
bp = bheadp;
while (bp != NULL) {
if (strcmp(bname, bp->b_bname) == 0)
return (bp);
bp = bp->b_bufp;
}
if (cflag!=TRUE) return NULL;
/*NOSTRICT*/
if ((bp=(BUFFER *)malloc(sizeof(BUFFER))) == NULL) {
ewprintf("Can't get %d bytes", sizeof(BUFFER));
return NULL;
}
if ((bp->b_bname=malloc(strlen(bname)+1)) == NULL) {
ewprintf("Can't get %d bytes", strlen(bname)+1);
free((char *) bp);
return NULL;
}
if ((lp=lalloc((RSIZE) 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 = 0;
bp->b_nwnd = 0;
bp->b_linep = lp;
(VOID) strcpy(bp->b_fname, "");
(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 BUFFER *bp; {
register LINE *lp;
register int s;
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 BUFFER *bp; register WINDOW *wp; {
register BUFFER *obp;
register 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.
*/
WINDOW *
popbuf(bp) register BUFFER *bp; {
register 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.
*/
bufferinsert(f, n, k)
{
register BUFFER *bp;
register 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;
for (clp = lforw(bp->b_linep); clp != bp->b_linep; clp = lforw(clp)) {
for (clo = 0; clo < llength(clp); clo++)
if (linsert((RSIZE)1, lgetc(clp, clo)) == FALSE)
return (FALSE);
if (newline(FALSE, 1, KRANDOM) == FALSE) /* fake newline */
return (FALSE);
nline++;
}
if (kbdmop==NULL) {
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, k)
{
register 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);
}