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buffer.c
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buffer.c
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/* buffer.c
*
* Buffer management.
* Some of the functions are internal,
* and some are actually attached to user
* keys. Like everyone else, they set hints
* for the display system
*
* modified by Petri Kutvonen
*/
#include <stdio.h>
#include "estruct.h"
#include "edef.h"
#include "efunc.h"
#include "line.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.
*/
int usebuffer(int f, int n)
{
struct buffer *bp;
int s;
char bufn[NBUFN];
if ((s = mlreply("Use buffer: ", bufn, NBUFN)) != TRUE)
return s;
if ((bp = bfind(bufn, TRUE, 0)) == NULL)
return FALSE;
return swbuffer(bp);
}
/*
* switch to the next buffer in the buffer list
*
* int f, n; default flag, numeric argument
*/
int nextbuffer(int f, int n)
{
struct buffer *bp = NULL; /* eligable buffer to switch to */
struct buffer *bbp; /* eligable buffer to switch to */
/* make sure the arg is legit */
if (f == FALSE)
n = 1;
if (n < 1)
return FALSE;
bbp = curbp;
while (n-- > 0) {
/* advance to the next buffer */
bp = bbp->b_bufp;
/* cycle through the buffers to find an eligable one */
while (bp == NULL || bp->b_flag & BFINVS) {
if (bp == NULL)
bp = bheadp;
else
bp = bp->b_bufp;
/* don't get caught in an infinite loop! */
if (bp == bbp)
return FALSE;
}
bbp = bp;
}
return swbuffer(bp);
}
/*
* make buffer BP current
*/
int swbuffer(struct buffer *bp)
{
struct window *wp;
if (--curbp->b_nwnd == 0) { /* Last use. */
curbp->b_dotp = curwp->w_dotp;
curbp->b_doto = curwp->w_doto;
curbp->b_markp = curwp->w_markp;
curbp->b_marko = curwp->w_marko;
}
curbp = bp; /* Switch. */
if (curbp->b_active != TRUE) { /* buffer not active yet */
/* read it in and activate it */
readin(curbp->b_fname, TRUE);
curbp->b_dotp = lforw(curbp->b_linep);
curbp->b_doto = 0;
curbp->b_active = TRUE;
curbp->b_mode |= gmode; /* P.K. */
}
curwp->w_bufp = bp;
curwp->w_linep = bp->b_linep; /* For macros, ignored. */
curwp->w_flag |= WFMODE | WFFORCE | WFHARD; /* Quite nasty. */
if (bp->b_nwnd++ == 0) { /* First use. */
curwp->w_dotp = bp->b_dotp;
curwp->w_doto = bp->b_doto;
curwp->w_markp = bp->b_markp;
curwp->w_marko = bp->b_marko;
cknewwindow();
return TRUE;
}
wp = wheadp; /* Look for old. */
while (wp != NULL) {
if (wp != curwp && wp->w_bufp == bp) {
curwp->w_dotp = wp->w_dotp;
curwp->w_doto = wp->w_doto;
curwp->w_markp = wp->w_markp;
curwp->w_marko = wp->w_marko;
break;
}
wp = wp->w_wndp;
}
cknewwindow();
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!). Get quite upset
* if the buffer is being displayed. Clear the buffer (ask
* if the buffer has been changed). Then free the header
* line and the buffer header. Bound to "C-X K".
*/
int killbuffer(int f, int n)
{
struct buffer *bp;
int s;
char bufn[NBUFN];
if ((s = mlreply("Kill buffer: ", bufn, NBUFN)) != TRUE)
return s;
if ((bp = bfind(bufn, FALSE, 0)) == NULL) /* Easy if unknown. */
return TRUE;
if (bp->b_flag & BFINVS) /* Deal with special buffers */
return TRUE; /* by doing nothing. */
return zotbuf(bp);
}
/*
* kill the buffer pointed to by bp
*/
int zotbuf(struct buffer *bp)
{
struct buffer *bp1;
struct buffer *bp2;
int s;
if (bp->b_nwnd != 0) { /* Error if on screen. */
mlwrite("Buffer is being displayed");
return FALSE;
}
if ((s = bclear(bp)) != TRUE) /* Blow text away. */
return s;
free((char *) bp->b_linep); /* Release header line. */
bp1 = NULL; /* Find the header. */
bp2 = bheadp;
while (bp2 != bp) {
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;
free((char *) bp); /* Release buffer block */
return TRUE;
}
/*
* Rename the current buffer
*
* int f, n; default Flag & Numeric arg
*/
int namebuffer(int f, int n)
{
struct buffer *bp; /* pointer to scan through all buffers */
char bufn[NBUFN]; /* buffer to hold buffer name */
/* prompt for and get the new buffer name */
ask:if (mlreply("Change buffer name to: ", bufn, NBUFN) !=
TRUE)
return FALSE;
/* and check for duplicates */
bp = bheadp;
while (bp != NULL) {
if (bp != curbp) {
/* if the names the same */
if (strcmp(bufn, bp->b_bname) == 0)
goto ask; /* try again */
}
bp = bp->b_bufp; /* onward */
}
strcpy(curbp->b_bname, bufn); /* copy buffer name to structure */
curwp->w_flag |= WFMODE; /* make mode line replot */
mlerase();
return TRUE;
}
/*
* List all of the active buffers. First update the special
* buffer that holds the list. Next make sure at least 1
* window is displaying the buffer list, splitting the screen
* if this is what it takes. Lastly, repaint all of the
* windows that are displaying the list. Bound to "C-X C-B".
*
* A numeric argument forces it to list invisible buffers as
* well.
*/
int listbuffers(int f, int n)
{
struct window *wp;
struct buffer *bp;
int s;
if ((s = makelist(f)) != TRUE)
return s;
if (blistp->b_nwnd == 0) { /* Not on screen yet. */
if ((wp = wpopup()) == NULL)
return FALSE;
bp = wp->w_bufp;
if (--bp->b_nwnd == 0) {
bp->b_dotp = wp->w_dotp;
bp->b_doto = wp->w_doto;
bp->b_markp = wp->w_markp;
bp->b_marko = wp->w_marko;
}
wp->w_bufp = blistp;
++blistp->b_nwnd;
}
wp = wheadp;
while (wp != NULL) {
if (wp->w_bufp == blistp) {
wp->w_linep = lforw(blistp->b_linep);
wp->w_dotp = lforw(blistp->b_linep);
wp->w_doto = 0;
wp->w_markp = NULL;
wp->w_marko = 0;
wp->w_flag |= WFMODE | WFHARD;
}
wp = wp->w_wndp;
}
return TRUE;
}
/*
* This routine rebuilds the
* text in the special secret buffer
* that holds the buffer list. It is called
* by the list buffers command. Return TRUE
* if everything works. Return FALSE if there
* is an error (if there is no memory). Iflag
* indicates wether to list hidden buffers.
*
* int iflag; list hidden buffer flag
*/
#define MAXLINE MAXCOL
int makelist(int iflag)
{
char *cp1;
char *cp2;
int c;
struct buffer *bp;
struct line *lp;
int s;
int i;
long nbytes; /* # of bytes in current buffer */
char b[7 + 1];
char line[MAXLINE];
blistp->b_flag &= ~BFCHG; /* Don't complain! */
if ((s = bclear(blistp)) != TRUE) /* Blow old text away */
return s;
strcpy(blistp->b_fname, "");
if (addline("ACT MODES Size Buffer File") == FALSE
|| addline("--- ----- ---- ------ ----") ==
FALSE)
return FALSE;
bp = bheadp; /* For all buffers */
/* build line to report global mode settings */
cp1 = &line[0];
*cp1++ = ' ';
*cp1++ = ' ';
*cp1++ = ' ';
*cp1++ = ' ';
/* output the mode codes */
for (i = 0; i < NUMMODES; i++)
if (gmode & (1 << i))
*cp1++ = modecode[i];
else
*cp1++ = '.';
strcpy(cp1, " Global Modes");
if (addline(line) == FALSE)
return FALSE;
/* output the list of buffers */
while (bp != NULL) {
/* skip invisable buffers if iflag is false */
if (((bp->b_flag & BFINVS) != 0) && (iflag != TRUE)) {
bp = bp->b_bufp;
continue;
}
cp1 = &line[0]; /* Start at left edge */
/* output status of ACTIVE flag (has the file been read in? */
if (bp->b_active == TRUE) /* "@" if activated */
*cp1++ = '@';
else
*cp1++ = ' ';
/* output status of changed flag */
if ((bp->b_flag & BFCHG) != 0) /* "*" if changed */
*cp1++ = '*';
else
*cp1++ = ' ';
/* report if the file is truncated */
if ((bp->b_flag & BFTRUNC) != 0)
*cp1++ = '#';
else
*cp1++ = ' ';
*cp1++ = ' '; /* space */
/* output the mode codes */
for (i = 0; i < NUMMODES; i++) {
if (bp->b_mode & (1 << i))
*cp1++ = modecode[i];
else
*cp1++ = '.';
}
*cp1++ = ' '; /* Gap. */
nbytes = 0L; /* Count bytes in buf. */
lp = lforw(bp->b_linep);
while (lp != bp->b_linep) {
nbytes += (long) llength(lp) + 1L;
lp = lforw(lp);
}
ltoa(b, 7, nbytes); /* 6 digit buffer size. */
cp2 = &b[0];
while ((c = *cp2++) != 0)
*cp1++ = c;
*cp1++ = ' '; /* Gap. */
cp2 = &bp->b_bname[0]; /* Buffer name */
while ((c = *cp2++) != 0)
*cp1++ = c;
cp2 = &bp->b_fname[0]; /* File name */
if (*cp2 != 0) {
while (cp1 < &line[3 + 1 + 5 + 1 + 6 + 4 + NBUFN])
*cp1++ = ' ';
while ((c = *cp2++) != 0) {
if (cp1 < &line[MAXLINE - 1])
*cp1++ = c;
}
}
*cp1 = 0; /* Add to the buffer. */
if (addline(line) == FALSE)
return FALSE;
bp = bp->b_bufp;
}
return TRUE; /* All done */
}
void ltoa(char *buf, int width, long num)
{
buf[width] = 0; /* End of string. */
while (num >= 10) { /* Conditional digits. */
buf[--width] = (int) (num % 10L) + '0';
num /= 10L;
}
buf[--width] = (int) num + '0'; /* Always 1 digit. */
while (width != 0) /* Pad with blanks. */
buf[--width] = ' ';
}
/*
* The argument "text" points to
* a string. Append this line to the
* buffer list buffer. Handcraft the EOL
* on the end. Return TRUE if it worked and
* FALSE if you ran out of room.
*/
int addline(char *text)
{
struct line *lp;
int i;
int ntext;
ntext = strlen(text);
if ((lp = lalloc(ntext)) == NULL)
return FALSE;
for (i = 0; i < ntext; ++i)
lputc(lp, i, text[i]);
blistp->b_linep->l_bp->l_fp = lp; /* Hook onto the end */
lp->l_bp = blistp->b_linep->l_bp;
blistp->b_linep->l_bp = lp;
lp->l_fp = blistp->b_linep;
if (blistp->b_dotp == blistp->b_linep) /* If "." is at the end */
blistp->b_dotp = lp; /* move it to new line */
return TRUE;
}
/*
* Look through the list of
* buffers. Return TRUE if there
* are any changed buffers. Buffers
* that hold magic internal stuff are
* not considered; who cares if the
* list of buffer names is hacked.
* Return FALSE if no buffers
* have been changed.
*/
int anycb(void)
{
struct buffer *bp;
bp = bheadp;
while (bp != NULL) {
if ((bp->b_flag & BFINVS) == 0
&& (bp->b_flag & BFCHG) != 0)
return TRUE;
bp = bp->b_bufp;
}
return FALSE;
}
/*
* Find a buffer, by name. Return a pointer
* to the buffer structure associated with it.
* If the buffer is not found
* and the "cflag" is TRUE, create it. The "bflag" is
* the settings for the flags in in buffer.
*/
struct buffer *bfind(char *bname, int cflag, int bflag)
{
struct buffer *bp;
struct buffer *sb; /* buffer to insert after */
struct line *lp;
bp = bheadp;
while (bp != NULL) {
if (strcmp(bname, bp->b_bname) == 0)
return bp;
bp = bp->b_bufp;
}
if (cflag != FALSE) {
if ((bp = (struct buffer *)malloc(sizeof(struct buffer))) == NULL)
return NULL;
if ((lp = lalloc(0)) == NULL) {
free((char *) bp);
return NULL;
}
/* find the place in the list to insert this buffer */
if (bheadp == NULL || strcmp(bheadp->b_bname, bname) > 0) {
/* insert at the beginning */
bp->b_bufp = bheadp;
bheadp = bp;
} else {
sb = bheadp;
while (sb->b_bufp != NULL) {
if (strcmp(sb->b_bufp->b_bname, bname) > 0)
break;
sb = sb->b_bufp;
}
/* and insert it */
bp->b_bufp = sb->b_bufp;
sb->b_bufp = bp;
}
/* and set up the other buffer fields */
bp->b_active = TRUE;
bp->b_dotp = lp;
bp->b_doto = 0;
bp->b_markp = NULL;
bp->b_marko = 0;
bp->b_flag = bflag;
bp->b_mode = gmode;
bp->b_nwnd = 0;
bp->b_linep = lp;
strcpy(bp->b_fname, "");
strcpy(bp->b_bname, bname);
#if CRYPT
bp->b_key[0] = 0;
#endif
lp->l_fp = lp;
lp->l_bp = lp;
}
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.
*/
int bclear(struct buffer *bp)
{
struct line *lp;
int s;
if ((bp->b_flag & BFINVS) == 0 /* Not scratch buffer. */
&& (bp->b_flag & BFCHG) != 0 /* Something changed */
&& (s = mlyesno("Discard changes")) != 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;
}
/*
* unmark the current buffers change flag
*
* int f, n; unused command arguments
*/
int unmark(int f, int n)
{
curbp->b_flag &= ~BFCHG;
curwp->w_flag |= WFMODE;
return TRUE;
}