Category : C Source Code
Archive   : VIM20SRC.ZIP
Filename : OPS.C

/* vi:ts=4:sw=4
*
* VIM - Vi IMproved
*
* Code Contributions By: Bram Moolenaar [email protected]
* Tim Thompson twitch!tjt
* Tony Andrews onecom!wldrdg!tony
* G. R. (Fred) Walter watmath!watcgl!grwalter
*/

/*
* ops.c: implementation of various operators: doshift, dodelete, dotilde,
* dochange, doyank, doput, dojoin
*/

#include "vim.h"
#include "globals.h"
#include "proto.h"
#include "param.h"
#include "ops.h"

/*
* We have one yank buffer for normal yanks and puts, nine yank buffers for
* deletes and 26 yank buffers for use by name.
* Each yank buffer is an array of pointers to lines.
*/
static struct yankbuf
{
char **y_array; /* pointer to array of line pointers */
linenr_t y_size; /* number of lines in y_array */
char y_type; /* MLINE, MCHAR or MBLOCK */
} y_buf[36]; /* 0..9 = number buffers, 10..35 = char buffers */

static struct yankbuf *y_current; /* ptr to current yank buffer */
static int yankappend; /* TRUE when appending */
static struct yankbuf *y_previous = NULL; /* ptr to last written yank buffer */

static void get_yank_buffer __ARGS((int));
static int stuff_yank __ARGS((int, char *));
static void free_yank __ARGS((long));
static void free_yank_all __ARGS((void));
static void block_prep __ARGS((linenr_t, int));

/* variables use by block_prep, dodelete and doyank */
static int startspaces;
static int endspaces;
static int textlen;
static char *textstart;
static colnr_t textcol;

/*
* doshift - handle a shift operation
*/
void
doshift(op)
int op;
{
register long i;

if (!u_save((linenr_t)(Curpos.lnum - 1), (linenr_t)(Curpos.lnum + nlines)))
return;

Curpos.lnum += nlines; /* start with last line, leave cursor on first */
for (i = nlines; --i >= 0; )
if (lineempty(--Curpos.lnum))
Curpos.col = 0;
else
{
/* if (Visual_block)
shift the block, not the whole line
else */
shift_line(op == LSHIFT, p_sr);
}

updateScreen(CURSUPD);

if (nlines > p_report)
smsg("%ld line%s %ced", nlines, plural(nlines),
(op == RSHIFT) ? '>' : '<');
}

/*
* shift the current line one shiftwidth left (if left != 0) or right
* leaves cursor on first blank in the line
*/
void
shift_line(left, round)
int left;
int round;
{
register int count;
register int i, j;

count = get_indent(); /* get current indent */

if (round) /* round off indent */
{
i = count / (int)p_sw; /* compute new indent */
j = count % (int)p_sw;
if (j)
{
if (!left)
++i;
}
else if (left)
{
if (i)
--i;
}
else
++i;
count = i * (int)p_sw;
}
else /* original vi indent */
{
if (left)
{
count -= (int)p_sw;
if (count < 0)
count = 0;
}
else
count += (int)p_sw;
}
set_indent(count, TRUE); /* set new indent */
}

/*
* Set y_current and yankappend, according to the value of yankbuffer.
*/
static void
get_yank_buffer(writing)
int writing;
{
register int i;

yankappend = FALSE;
if (((yankbuffer == 0 && !writing) || yankbuffer == '"') && y_previous != NULL)
{
y_current = y_previous;
return;
}
i = yankbuffer;
if (isdigit(i))
i -= '0';
else if (islower(i))
i -= 'a' - 10;
else if (isupper(i))
{
i -= 'A' - 10;
yankappend = TRUE;
}
else /* not 0-9, a-z or A-Z: use buffer 0 */
i = 0;
y_current = &(y_buf[i]);
if (writing) /* remember the buffer we write into for doput() */
y_previous = y_current;
}

/*
* (stop) recording into a yank buffer
*/
int
dorecord(c)
int c;
{
char *p;
static int bufname;

if (Recording == FALSE) /* start recording */
{
if (!isalnum(c) && c != '"') /* registers 0-9, a-z and " are allowed */
return FALSE;
Recording = TRUE;
showmode();
bufname = c;
return TRUE;
}
else /* stop recording */
{
Recording = FALSE;
msg("");
/* the trailing 'q' command will not have been put in the buffer */
p = (char *)get_recorded();
if (p == NULL)
return FALSE;
return (stuff_yank(bufname, p));
}
}

/*
* stuff string 'p' into yank buffer 'bufname' (append if uppercase)
* 'p' is assumed to be alloced.
*/
static int
stuff_yank(bufname, p)
int bufname;
char *p;
{
char *lp;
char **pp;

yankbuffer = bufname;
if (yankbuffer == '.' || yankbuffer == '%') /* read-only buffer */
return FALSE;
get_yank_buffer(TRUE);
if (yankappend && y_current->y_array != NULL)
{
pp = &(y_current->y_array[y_current->y_size - 1]);
lp = lalloc((u_long)(strlen(*pp) + strlen(p) + 1), TRUE);
if (lp == NULL)
{
free(p);
return FALSE;
}
strcpy(lp, *pp);
strcat(lp, p);
free(p);
free(*pp);
*pp = lp;
}
else
{
free_yank_all();
if ((y_current->y_array = (char **)alloc((unsigned)sizeof(char *))) == NULL)
{
free(p);
return FALSE;
}
y_current->y_array[0] = p;
y_current->y_size = 1;
y_current->y_type = MCHAR; /* used to be MLINE, why? */
}
return TRUE;
}

/*
* execute a yank buffer (register): copy it into the stuff buffer
*/
int
doexecbuf(c)
int c;
{
static int lastc = NUL;
long i;

if (c == '@') /* repeat previous one */
c = lastc;

lastc = c;
if (!isalnum(c) && c != '"') /* registers 0-9, a-z and " are allowed */
return FALSE;

yankbuffer = c;
get_yank_buffer(FALSE);
if (y_current->y_array == NULL)
return FALSE;

for (i = y_current->y_size; --i >= 0; )
{
/* insert newline between lines and after last line if type is MLINE */
if (y_current->y_type == MLINE || i < y_current->y_size - 1)
{
if (ins_typestr("\n", FALSE) < 0)
return FALSE;
}
if (ins_typestr(y_current->y_array[i], FALSE) < 0)
return FALSE;
}
Exec_reg = TRUE; /* disable the 'q' command */
return TRUE;
}

/*
* insert a yank buffer: copy it into the Read buffer
*/
int
insertbuf(c)
int c;
{
long i;

if (c == '%') /* insert file name */
{
if (check_fname())
return FALSE;
stuffReadbuff(xFilename);
return TRUE;
}

if (!isalnum(c) && c != '"') /* registers 0-9, a-z and " are allowed */
return FALSE;

yankbuffer = c;
get_yank_buffer(FALSE);
if (y_current->y_array == NULL)
return FALSE;

for (i = 0; i < y_current->y_size; ++i)
{
stuffReadbuff(y_current->y_array[i]);
/* insert newline between lines and after last line if type is MLINE */
if (y_current->y_type == MLINE || i < y_current->y_size - 1)
stuffReadbuff("\n");
}
return TRUE;
}

/*
* dodelete - handle a delete operation
*/
void
dodelete()
{
register int n;
linenr_t lnum;
char *ptr;
linenr_t old_lcount = line_count;

/*
* Imitate the strange Vi behaviour: If the delete spans more than one line
* and mtype == MCHAR and the result is a blank line, make the delete
* linewise. Don't do this for the change command.
*/
if (mtype == MCHAR && nlines > 1 && operator == DELETE)
{
ptr = nr2ptr(endop.lnum) + endop.col + mincl;
skipspace(&ptr);
if (*ptr == NUL && startinmargin())
mtype = MLINE;
}

/*
* Shift number buffers if there is no yankbuffer defined and we do a
* delete that contains a line break.
*/
if (yankbuffer == 0 && (mtype == MLINE || nlines > 1))
{
y_current = &y_buf[9];
free_yank_all(); /* free buffer nine */
for (n = 9; n > 1; --n)
y_buf[n] = y_buf[n - 1];
y_previous = y_current = &y_buf[1];
y_buf[1].y_array = NULL; /* set buffer one to empty */
}
else if (yankbuffer == '.' || yankbuffer == '%') /* read-only buffer */
{
beep();
return;
}
else /* yank into specified buffer */
get_yank_buffer(TRUE);

/*
* Do a yank of whatever we're about to delete. If there's too much stuff
* to fit in the yank buffer, then get a confirmation before doing the
* delete. This is crude, but simple. And it avoids doing a delete of
* something we can't put back if we want.
*/
if (!doyank(TRUE))
{
if (ask_yesno("cannot yank; delete anyway") != 'y')
{
emsg(e_abort);
return;
}
}

/*
* block mode
*/
if (Visual_block)
{
if (!u_save((linenr_t)(startop.lnum - 1), (linenr_t)(endop.lnum + 1)))
return;

for (lnum = Curpos.lnum; Curpos.lnum <= endop.lnum; ++Curpos.lnum)
{
block_prep(Curpos.lnum, TRUE);
if (textlen == 0) /* nothing to delete */
continue;

/*
* If we delete a TAB, it may be replaced by several characters.
* Thus the number of characters may increase!
*/
n = textlen - startspaces - endspaces;
/* number of characters increases - make room */
if (n < 0 && !canincrease(-n))
continue;
ptr = nr2ptr(Curpos.lnum) + textcol;
/* copy the part after the deleted part */
memmove(ptr + startspaces + endspaces, ptr + textlen, strlen(ptr + textlen) + 1);
/* insert spaces */
copy_spaces(ptr, (size_t)(startspaces + endspaces));
if (n > 0)
canincrease(0);
}
Curpos.lnum = lnum;
CHANGED;
updateScreen(VALID_TO_CURSCHAR);
nlines = 0; /* no lines deleted */
}
else if (mtype == MLINE)
{
if (operator == CHANGE)
{
dellines((long)(nlines - 1), TRUE, TRUE);
if (!u_saveCurpos())
return;
while (delchar(TRUE)); /* slow but simple */
}
else
{
dellines(nlines, TRUE, TRUE);
}
u_clearline(); /* "U" command should not be possible after "dd" */
}
else if (nlines == 1) /* delete characters within one line */
{
if (!u_saveCurpos())
return;
n = endop.col - startop.col + 1 - !mincl;
while (n-- > 0)
if (!delchar(TRUE))
break;
}
else /* delete characters between lines */
{
if (!u_saveCurpos()) /* save first line for undo */
return;
n = Curpos.col;
while (Curpos.col >= n) /* delete from cursor to end of line */
if (!delchar(TRUE))
break;

startop = Curpos; /* remember Curpos */
++Curpos.lnum;
dellines((long)(nlines - 2), TRUE, TRUE); /* includes save for undo */

if (!u_saveCurpos()) /* save last line for undo */
return;
n = endop.col - !mincl;
Curpos.col = 0;
while (n-- >= 0) /* delete from start of line until endop */
if (!delchar(TRUE))
break;
Curpos = startop; /* restore Curpos */
dojoin(FALSE, TRUE);
}

if ((mtype == MCHAR && nlines == 1) || operator == CHANGE)
{
cursupdate();
updateline();
}
else
updateScreen(CURSUPD);

msgmore(line_count - old_lcount);

/* correct endop for deleted text (for "']" command) */
if (Visual_block)
endop.col = startop.col;
else
endop = startop;
}

/*
* dotilde - handle the (non-standard vi) tilde operator
*/
void
dotilde()
{
FPOS pos;

if (!u_save((linenr_t)(startop.lnum - 1), (linenr_t)(endop.lnum + 1)))
return;

pos = startop;
if (Visual_block) /* block mode */
{
for (; pos.lnum <= endop.lnum; ++pos.lnum)
{
block_prep(pos.lnum, FALSE);
pos.col = textcol;
while (--textlen >= 0)
{
swapchar(&pos);
if (inc(&pos) == -1) /* at end of file */
break;
}
}
}
else /* not block mode */
{
if (mtype == MLINE)
{
pos.col = 0;
endop.col = strlen(nr2ptr(endop.lnum));
if (endop.col)
--endop.col;
}
else if (!mincl)
dec(&endop);

while (ltoreq(pos, endop))
{
swapchar(&pos);
if (inc(&pos) == -1) /* at end of file */
break;
}
}

if (mtype == MCHAR && nlines == 1 && !Visual_block)
{
cursupdate();
updateline();
}
else
updateScreen(CURSUPD);

if (nlines > p_report)
smsg("%ld line%s ~ed", nlines, plural(nlines));
}

/*
* If operator == UPPER: make uppercase,
* if operator == LOWER: make lowercase,
* else swap case of character at 'pos'
*/
void
swapchar(pos)
FPOS *pos;
{
int c;

c = gchar(pos);
if (islower(c) && operator != LOWER)
{
pchar(*pos, toupper(c));
CHANGED;
}
else if (isupper(c) && operator != UPPER)
{
pchar(*pos, tolower(c));
CHANGED;
}
}

/*
* dochange - handle a change operation
*/
void
dochange()
{
register colnr_t l;

l = startop.col;

if (!no_op)
dodelete();

if ((l > Curpos.col) && !lineempty(Curpos.lnum))
incCurpos();

startinsert(NUL, FALSE, (linenr_t)1);
}

/*
* set all the yank buffers to empty (called from main())
*/
void
init_yank()
{
register int i;

for (i = 0; i < 36; ++i)
y_buf[i].y_array = NULL;
}

/*
* Free "n" lines from the current yank buffer.
* Called for normal freeing and in case of error.
*/
static void
free_yank(n)
long n;
{
if (y_current->y_array != NULL)
{
register long i;

for (i = n; --i >= 0; )
{
if (i % 1000 == 999) /* this may take a while */
smsg("freeing %ld lines", i + 1);
free(y_current->y_array[i]);
}
free((char *)y_current->y_array);
y_current->y_array = NULL;
if (n >= 1000)
msg("");
}
}

static void
free_yank_all()
{
free_yank(y_current->y_size);
}

/*
* Yank the text between Curpos and startpos into a yank buffer.
* If we are to append ("uppercase), we first yank into a new yank buffer and
* then concatenate the old and the new one (so we keep the old one in case
* of out-of-memory).
*/
int
doyank(deleting)
int deleting;
{
long i; /* index in y_array[] */
struct yankbuf *curr; /* copy of y_current */
struct yankbuf new; /* new yank buffer when appending */
char **new_ptr;
register linenr_t lnum; /* current line number */
long j;
int yanktype = mtype;
long yanklines = nlines;
linenr_t yankendlnum = endop.lnum;

char *pnew;

if (yankbuffer == '.' || yankbuffer == '%') /* read-only buffer */
{
beep();
return FALSE;
}
if (!deleting) /* dodelete() already set y_current */
get_yank_buffer(TRUE);

curr = y_current;
if (yankappend && y_current->y_array != NULL) /* append to existing contents */
y_current = &new;
else
free_yank_all(); /* free previously yanked lines */

/*
* If the cursor was in column 1 before and after the movement, the
* yank is always linewise.
*/
if (mtype == MCHAR && startop.col == 0 && endop.col == 0 && nlines > 1)
{
yanktype = MLINE;
if (mincl == FALSE && yankendlnum > startop.lnum)
{
--yankendlnum;
--yanklines;
}
}

y_current->y_size = yanklines;
y_current->y_type = yanktype; /* set the yank buffer type */
y_current->y_array = (char **)lalloc((u_long)(sizeof(char *) * yanklines), TRUE);

if (y_current->y_array == NULL)
{
y_current = curr;
return FALSE;
}

i = 0;
lnum = startop.lnum;

if (Visual_block)
{
/*
* block mode
*/
y_current->y_type = MBLOCK; /* set the yank buffer type */
for ( ; lnum <= yankendlnum; ++lnum)
{
block_prep(lnum, FALSE);
if ((pnew = alloc(startspaces + endspaces + textlen + 1)) == NULL)
goto fail;
y_current->y_array[i++] = pnew;
copy_spaces(pnew, (size_t)startspaces);
pnew += startspaces;
strncpy(pnew, textstart, (size_t)textlen);
pnew += textlen;
copy_spaces(pnew, (size_t)endspaces);
pnew += endspaces;
*pnew = NUL;
}
}
else
{
/*
* there are three parts for non-block mode:
* 1. if yanktype != MLINE yank last part of the top line
* 2. yank the lines between startop and endop, inclusive when yanktype == MLINE
* 3. if yanktype != MLINE yank first part of the bot line
*/
if (yanktype != MLINE)
{
if (yanklines == 1) /* startop and endop on same line */
{
j = endop.col - startop.col + 1 - !mincl;
if ((y_current->y_array[0] = strnsave(nr2ptr(lnum) + startop.col, (int)j)) == NULL)
{
fail:
free_yank(i); /* free the lines that we allocated */
y_current = curr;
return FALSE;
}
goto success;
}
if ((y_current->y_array[0] = strsave(nr2ptr(lnum++) + startop.col)) == NULL)
goto fail;
++i;
}

while (yanktype == MLINE ? (lnum <= yankendlnum) : (lnum < yankendlnum))
{
if ((y_current->y_array[i] = strsave(nr2ptr(lnum++))) == NULL)
goto fail;
++i;
}
if (yanktype != MLINE)
{
if ((y_current->y_array[i] = strnsave(nr2ptr(yankendlnum), endop.col + 1 - !mincl)) == NULL)
goto fail;
}
}

success:
if (curr != y_current) /* append the new block to the old block */
{
new_ptr = (char **)lalloc((u_long)(sizeof(char *) * (curr->y_size + y_current->y_size)), TRUE);
if (new_ptr == NULL)
goto fail;
for (j = 0; j < curr->y_size; ++j)
new_ptr[j] = curr->y_array[j];
free(curr->y_array);
curr->y_array = new_ptr;

if (yanktype == MLINE) /* MLINE overrides MCHAR and MBLOCK */
curr->y_type = MLINE;
if (curr->y_type == MCHAR) /* concatenate the last line of the old
block with the first line of the new block */
{
new_ptr = (char **)lalloc((u_long)(strlen(curr->y_array[curr->y_size - 1]) + strlen(y_current->y_array[0]) + 1), TRUE);
if (new_ptr == NULL)
{
i = y_current->y_size - 1;
goto fail;
}
strcpy((char *)new_ptr, curr->y_array[--j]);
strcat((char *)new_ptr, y_current->y_array[0]);
free(curr->y_array[j]);
free(y_current->y_array[0]);
curr->y_array[j++] = (char *)new_ptr;
i = 1;
}
else
i = 0;
while (i < y_current->y_size)
curr->y_array[j++] = y_current->y_array[i++];
curr->y_size = j;
free(y_current->y_array);
y_current = curr;
}
if (operator == YANK) /* don't do this when deleting */
{
if (yanktype == MCHAR && !Visual_block)
--yanklines;
if (yanklines > p_report)
{
cursupdate(); /* redisplay now, so message is not deleted */
smsg("%ld line%s yanked", yanklines, plural(yanklines));
}
}

return TRUE;
}

void
doput(dir, count)
int dir;
long count;
{
char *ptr, *ep;
int newlen;
int totlen = 0; /* init for gcc */
linenr_t lnum;
int col;
long i; /* index in y_array[] */
int y_type;
long y_size;
char **y_array;
long nlines = 0;
int vcol;
int delchar;
int incr = 0;
long j;
FPOS newCurpos;
int commandchar;
char temp[2];

startop = Curpos; /* default for "'[" command */
if (dir == FORWARD)
startop.col++;
endop = Curpos; /* default for "']" command */
commandchar = (dir == FORWARD ? (count == -1 ? 'o' : 'a') : (count == -1 ? 'O' : 'i'));
if (yankbuffer == '.') /* use inserted text */
{
stuff_inserted(commandchar, count, FALSE);
return;
}
else if (yankbuffer == '%') /* use file name */
{
if (!check_fname())
{
stuffcharReadbuff(commandchar);
stuffReadbuff(xFilename);
stuffcharReadbuff(ESC);
}
return;
}
get_yank_buffer(FALSE);

y_type = y_current->y_type;
y_size = y_current->y_size;
y_array = y_current->y_array;

if (count == -1) /* :put command */
{
y_type = MLINE;
count = 1;
}

if (y_size == 0 || y_array == NULL)
{
temp[0] = yankbuffer;
temp[1] = NUL;
emsg2("Nothing in register %s", temp);
return;
}

if (y_type == MBLOCK)
{
lnum = Curpos.lnum + y_size + 1;
if (lnum > line_count)
lnum = line_count + 1;
if (!u_save(Curpos.lnum - 1, lnum))
return;
}
else if (!u_saveCurpos())
return;

newlen = strlen(y_array[0]);
CHANGED;

lnum = Curpos.lnum;
col = Curpos.col;

/*
* block mode
*/
if (y_type == MBLOCK)
{
if (dir == FORWARD && gcharCurpos() != NUL)
{
col = getvcol(&Curpos, 3) + 1;
++Curpos.col;
}
else
col = getvcol(&Curpos, 2);
for (i = 0; i < y_size; ++i)
{
startspaces = 0;
endspaces = 0;
textcol = 0;
vcol = 0;
delchar = 0;

/* add a new line */
if (Curpos.lnum > line_count)
{
ep = alloc_line(0);
if (ep == NULL)
goto error;
appendline(line_count, ep);
++nlines;
}
ptr = nr2ptr(Curpos.lnum);
while (vcol < col && *ptr)
{
/* Count a tab for what it's worth (if list mode not on) */
incr = chartabsize(*ptr, vcol);
vcol += incr;
++ptr;
++textcol;
}
if (vcol < col) /* line too short, padd with spaces */
{
startspaces = col - vcol;
}
else if (vcol > col)
{
endspaces = vcol - col;
startspaces = incr - endspaces;
--textcol;
delchar = 1;
}
newlen = strlen(y_array[i]);
totlen = count * newlen + startspaces + endspaces;
if (!canincrease(totlen))
break;
ptr = nr2ptr(Curpos.lnum) + textcol;

/* move the text after the cursor to the end of the line. */
memmove(ptr + totlen - delchar, ptr, strlen(ptr) + 1);
/* may insert some spaces before the new text */
copy_spaces(ptr, (size_t)startspaces);
ptr += startspaces;
/* insert the new text */
for (j = 0; j < count; ++j)
{
strncpy(ptr, y_array[i], (size_t)newlen);
ptr += newlen;
}
/* may insert some spaces after the new text */
copy_spaces(ptr, (size_t)endspaces);

++Curpos.lnum;
if (i == 0)
Curpos.col += startspaces;
}
endop.lnum = Curpos.lnum - 1; /* for "']" command */
endop.col = textcol + totlen - 1;
Curpos.lnum = lnum;
cursupdate();
updateScreen(VALID_TO_CURSCHAR);
}
else /* not block mode */
{
if (y_type == MCHAR)
{
/* if type is MCHAR, FORWARD is the same as BACKWARD on the next character */
if (dir == FORWARD && gcharCurpos() != NUL)
{
++col;
if (newlen)
{
++Curpos.col;
++endop.col;
}
}
newCurpos = Curpos;
}
else if (dir == BACKWARD)
/* if type is MLINE, BACKWARD is the same as FORWARD on the previous line */
--lnum;
else /* type == MLINE, dir == FORWARD */
{
startop.col = 0;
startop.lnum++;
}

/*
* simple case: insert into current line
*/
if (y_type == MCHAR && y_size == 1)
{
i = count * newlen;
if (i)
{
if (!canincrease((int)i))
return; /* alloc() will give error message */
ep = nr2ptr(lnum) + col;
memmove(ep + i, ep, strlen(ep) + 1);
Curpos.col += (colnr_t)(i - 1); /* put cursor on last putted char */
for (i = 0; i < count; ++i)
{
strncpy(ep, y_array[0], (size_t)newlen);
ep += newlen;
}
}
endop = Curpos;
updateline();
}
else
{
if (y_type == MCHAR)
--y_size;
while (--count >= 0)
{
i = 0;
if (y_type == MCHAR)
{
/*
* Split the current line in two at the insert position.
* Append y_array[0] to first line.
* Insert y_array[size - 1] in front of second line.
*/
ptr = nr2ptr(lnum) + col;
col = strlen(y_array[y_size]);
ep = alloc_line((unsigned)(strlen(ptr) + col));
if (ep == NULL)
goto error;
strcpy(ep, y_array[y_size]);
strcat(ep, ptr);
appendline(lnum, ep); /* insert in second line */
++nlines;
*ptr = NUL;
Curpos.lnum = lnum;
if (!canincrease(newlen)) /* lnum == Curpos.lnum! */
goto error;
strcat(nr2ptr(lnum), y_array[0]);/* append to first line */
i = 1;
}

while (i < y_size)
{
ep = save_line(y_array[i++]);
if (ep == NULL)
goto error;
appendline(lnum++, ep);
++nlines;
}
if (y_type == MCHAR)
++lnum; /* lnum is now number of line below inserted lines */
}


endop.lnum = lnum; /* for "']" command */
if (y_type == MLINE)
{
Curpos.col = 0;
endop.col = 0;
if (dir == FORWARD)
{
updateScreen(NOT_VALID); /* recompute Botline */
++Curpos.lnum;
}
/* put cursor on first non-blank in last inserted line */
beginline(TRUE);
}
else /* put cursor on first inserted character */
{
if (col > 1)
endop.col = col - 1;
else
endop.col = 0;
Curpos = newCurpos;
}

error:
updateScreen(CURSUPD);
}
}

msgmore(nlines);
set_want_col = TRUE;
}

/*
* display the contents of the yank buffers
*/
void
dodis()
{
register int i, n;
register long j;
register char *p;
register struct yankbuf *yb;

#ifdef AMIGA
settmode(0); /* set cooked mode so output can be halted */
#endif
for (i = -1; i < 36; ++i)
{
if (i == -1)
{
if (y_previous != NULL)
yb = y_previous;
else
yb = &(y_buf[0]);
}
else
yb = &(y_buf[i]);
if (yb->y_array != NULL)
{
if (i == -1)
outstrn("\"\"");
else
{
outchar('"');
if (i < 10)
outchar(i + '0');
else
outchar(i + 'a' - 10);
}
outchar(' ');

n = (int)Columns - 4;
for (j = 0; j < yb->y_size && n > 0; ++j)
{
if (j)
{
outstrn("^J");
n -= 2;
}
for (p = yb->y_array[j]; *p && n > 0; ++p)
{
outstrn(transchar(*p));
n -= charsize(*p);
}
}
outchar('\n');
flushbuf();
}
}
#ifdef AMIGA
settmode(1);
#endif
wait_return(TRUE);
}

/*
* join 'count' lines (minimal 2), including u_save()
*/
void
dodojoin(count, insert_space, redraw)
long count;
int insert_space;
int redraw;
{
if (!u_save((linenr_t)(Curpos.lnum - 1), (linenr_t)(Curpos.lnum + count)))
return;

while (--count > 0)
if (!dojoin(insert_space, redraw))
{
beep();
break;
}

if (redraw)
updateScreen(VALID_TO_CURSCHAR);
}

int
dojoin(insert_space, redraw)
int insert_space;
int redraw;
{
char *curr;
char *next;
char *endcurr;
int currsize; /* size of the current line */
int nextsize; /* size of the next line */
int spaces; /* number of spaces to insert */
int rows_to_del; /* number of rows on screen to delete */
linenr_t t;

if (Curpos.lnum == line_count) /* on last line */
return FALSE;

rows_to_del = plines_m(Curpos.lnum, Curpos.lnum + 1);
curr = nr2ptr(Curpos.lnum);
currsize = strlen(curr);
next = nr2ptr((linenr_t)(Curpos.lnum + 1));
spaces = 0;
if (insert_space)
{
skipspace(&next);
spaces = 1;
if (*next == ')' || currsize == 0)
spaces = 0;
else
{
endcurr = curr + currsize - 1;
if (*endcurr == ' ' || *endcurr == TAB)
{
spaces = 0;
if (currsize > 1)
--endcurr;
}
if (p_js && strchr(".!?", *endcurr) != NULL)
spaces = 2;
}
}
nextsize = strlen(next);
if (!canincrease(nextsize + spaces))
return FALSE;

/*
* Append the spaces and the next line. Curr has to be obtained again,
* because canincrease() will have changed the pointer.
*/
curr = nr2ptr(Curpos.lnum) + currsize;
while (spaces--)
*curr++ = ' ';
strcpy(curr, next);

/*
* Delete the following line. To do this we move the cursor there
* briefly, and then move it back. After dellines() the cursor may
* have moved up (last line deleted), so the current lnum is kept in t.
*/
t = Curpos.lnum;
++Curpos.lnum;
dellines(1L, FALSE, FALSE);
Curpos.lnum = t;

/*
* the number of rows on the screen is reduced by the difference
* in number of rows of the two old lines and the one new line
*/
if (redraw)
{
rows_to_del -= plines(Curpos.lnum);
if (rows_to_del > 0)
s_del(Cursrow, rows_to_del, TRUE);
}

/*
* go to first character of the joined line
*/
if (currsize == 0)
Curpos.col = 0;
else
{
Curpos.col = currsize - 1;
oneright();
}
CHANGED;

return TRUE;
}

/*
* implementation of the format operator 'Q'
*/
void
doformat()
{
/* prepare undo and join the lines */
dodojoin((long)nlines, TRUE, FALSE);

/* put cursor on last non-space */
coladvance(MAXCOL);
while (Curpos.col && isspace(gcharCurpos()))
decCurpos();
curs_columns(FALSE); /* update Cursvcol */

/* do the formatting */
State = INSERT; /* for Opencmd() */
insertchar(NUL);
State = NORMAL;
updateScreen(NOT_VALID);
}

void
startinsert(initstr, startln, count)
int initstr;
int startln; /* if set, insert at start of line */
long count;
{
Insstart = Curpos;
if (startln)
Insstart.col = 0;

if (initstr != NUL)
{
ResetRedobuff();
AppendNumberToRedobuff(count);
AppendCharToRedobuff(initstr);
}

if (initstr == 'R')
State = REPLACE;
else
State = INSERT;

if (p_smd)
showmode();

change_warning(); /* give a warning if readonly */
edit(count);
}

/*
* prepare a few things for block mode yank/delete/tilde
*
* for delete:
* - textlen includes the first/last char to be (partly) deleted
* - start/endspaces is the number of columns that are taken by the
* first/last deleted char minus the number of columns that have to be deleted.
* for yank and tilde:
* - textlen includes the first/last char to be wholly yanked
* - start/endspaces is the number of columns of the first/last yanked char
* that are to be yanked.
*/
static void
block_prep(lnum, delete)
linenr_t lnum;
int delete;
{
int vcol;
int incr = 0;
char *pend;

startspaces = 0;
endspaces = 0;
textlen = 0;
textcol = 0;
vcol = 0;
textstart = nr2ptr(lnum);
while (vcol < startvcol && *textstart)
{
/* Count a tab for what it's worth (if list mode not on) */
incr = chartabsize(*textstart, vcol);
vcol += incr;
++textstart;
++textcol;
}
if (vcol < startvcol) /* line too short */
{
if (!delete)
endspaces = endvcol - startvcol + 1;
}
else /* vcol >= startvcol */
{
startspaces = vcol - startvcol;
if (delete && vcol > startvcol)
startspaces = incr - startspaces;
pend = textstart;
while (vcol <= endvcol && *pend)
{
/* Count a tab for what it's worth (if list mode not on) */
incr = chartabsize(*pend, vcol);
vcol += incr;
++pend;
}
if (vcol < endvcol && !delete) /* line too short */
{
endspaces = endvcol - vcol;
}
else if (vcol > endvcol)
{
if (delete)
endspaces = vcol - endvcol - 1;
else if (pend != textstart)
{
endspaces = incr - (vcol - endvcol);
if (endspaces)
--pend;
}
}
if (delete && startspaces)
{
--textstart;
--textcol;
}
textlen = (int)(pend - textstart);
}
}

int
doaddsub(c, Prenum1)
int c;
linenr_t Prenum1;
{
register int col;
char buf[30];
int hex; /* 'x' or 'X': hexadecimal; '0': octal */
static int hexupper = FALSE; /* 0xABC */
long n;
char *ptr;

ptr = nr2ptr(Curpos.lnum);
col = Curpos.col;

/* first check if we are on a hexadecimal number */
while (col > 0 && isxdigit(ptr[col]))
--col;
if (col > 0 && (ptr[col] == 'X' || ptr[col] == 'x') &&
ptr[col - 1] == '0' && isxdigit(ptr[col + 1]))
--col; /* found hexadecimal number */
else
{
/* first search forward and then backward for start of number */
col = Curpos.col;

while (ptr[col] != NUL && !isdigit(ptr[col]))
++col;

while (col > 0 && isdigit(ptr[col - 1]))
--col;
}

if (isdigit(ptr[col]) && u_saveCurpos())
{
set_want_col = TRUE;

if (ptr[col] != '0')
hex = 0; /* decimal */
else
{
hex = TO_UPPER(ptr[col + 1]); /* assume hexadecimal */
if (hex != 'X' || !isxdigit(ptr[col + 2]))
{
if (isdigit(hex))
hex = '0'; /* octal */
else
hex = 0; /* 0 by itself is decimal */
}
}

if (!hex && col > 0 && ptr[col - 1] == '-')
--col;

ptr += col;
if (hex == '0')
sscanf(ptr, "%lo", &n);
else if (hex)
sscanf(ptr, "%lx", &n); /* "%X" doesn't work! */
else
n = atol(ptr);

if (c == Ctrl('A'))
n += Prenum1;
else
n -= Prenum1;

if (hex == 'X') /* skip the '0x' */
col += 2;
Curpos.col = col;
do /* delete the old number */
{
if (isalpha(c))
{
if (isupper(c))
hexupper = TRUE;
else
hexupper = FALSE;
}
delchar(FALSE);
c = gcharCurpos();
}
while (hex ? (hex == '0' ? c >= '0' && c <= '7' : isxdigit(c)) : isdigit(c));

if (hex == '0')
sprintf(buf, "0%lo", n);
else if (hexupper)
sprintf(buf, "%lX", n);
else if (hex)
sprintf(buf, "%lx", n);
else
sprintf(buf, "%ld", n);
insstr(buf); /* insert the new number */
--Curpos.col;
updateline();
return TRUE;
}
else
{
beep();
return FALSE;
}
}

/*
* Return TRUE if startop is on or before the first non-blank character in the line
*/
int
startinmargin()
{
int n;
char *ptr;

n = 0;
for (ptr = nr2ptr(startop.lnum); *ptr && isspace(*ptr); ++ptr)
++n;
return (n >= startop.col);
}