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gno/bin/vi/bug2.c
gdr-ftp 784e3de7cd Initial checkin of aroff, binprint, center, less, ls, make, makemake, 
passwd, ps, purge, shutdown, stty, upper, and vi.  These sources are
for the versions of the utils shipped with GNO v2.0.4.
1998-03-09 08:30:21 +00:00

1684 lines
32 KiB
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/*
* STEVIE - Simply Try this Editor for VI Enthusiasts
*
* Code Contributions By : Tim Thompson twitch!tjt
* Tony Andrews onecom!wldrdg!tony
* G. R. (Fred) Walter watmath!grwalter
*/
/*
* This file contains the main routine for processing characters in command
* mode as well as routines for handling the operators.
*/
#ifdef __ORCAC__
segment "normal";
#endif
#include "bugstevie.h"
static void doshift();
static void dodelete();
static void doput();
static void dochange();
static void startinsert();
static bool_t dojoin();
static bool_t doyank();
/*
* Macro evaluates true if char 'c' is a valid identifier character
*/
#define IDCHAR(c) (isalpha(c) || isdigit(c) || (c) == '_')
/*
* Operators
*/
#define NOP 0 /* no pending operation */
#define DELETE 1
#define YANK 2
#define CHANGE 3
#define LSHIFT 4
#define RSHIFT 5
#define CLEAROP (operator = NOP)/* clear any pending operator */
static int operator = NOP; /* current pending operator */
/*
* When a cursor motion command is made, it is marked as being a character or
* line oriented motion. Then, if an operator is in effect, the operation
* becomes character or line oriented accordingly.
*
* Character motions are marked as being inclusive or not. Most char. motions
* are inclusive, but some (e.g. 'w') are not.
*
* Generally speaking, every command in normal() should either clear any pending
* operator (with CLEAROP), or set the motion type variable.
*/
/*
* Motion types
*/
#define MBAD (-1) /* 'bad' motion type marks unusable yank buf */
#define MCHAR 0
#define MLINE 1
static int mtype; /* type of the current cursor motion */
static bool_t mincl; /* true if char motion is inclusive */
static int ybtype = MBAD;
static int ybcrossline = FALSE;
static LPtr startop; /* cursor pos. at start of operator */
/*
* Operators can have counts either before the operator, or between the
* operator and the following cursor motion as in:
*
* d3w or 3dw
*
* If a count is given before the operator, it is saved in opnum. If normal() is
* called with a pending operator, the count in opnum (if present) overrides
* any count that came later.
*/
static int opnum = 0;
#define DEFAULT1(x) (((x) == 0) ? 1 : (x))
/*
* normal
*
* Execute a command in normal mode.
*/
void
normal(c)
char c;
{
char *p;
int n;
int nn;
bool_t flag = FALSE;
int type = 0; /* used in some operations to modify type */
int dir = FORWARD; /* search direction */
char nchar = NUL;
bool_t finish_op;
LPtr temp_Curschar;
last_command = NUL;
/*
* If there is an operator pending, then the command we take this time
* will terminate it. Finish_op tells us to finish the operation before
* returning this time (unless the operation was cancelled).
*/
finish_op = (operator != NOP);
/*
* If we're in the middle of an operator AND we had a count before the
* operator, then that count overrides the current value of Prenum. What
* this means effectively, is that commands like "3dw" get turned into
* "d3w" which makes things fall into place pretty neatly.
*/
if (finish_op) {
if (opnum != 0)
Prenum = opnum;
} else
opnum = 0;
switch (c) {
case K_HELP:
CLEAROP;
if (help())
s_clear();
break;
case CTRL('L'):
CLEAROP;
s_clear();
break;
case CTRL('D'):
CLEAROP;
if (Prenum)
P(P_SS) = (Prenum > Rows - 1) ? Rows - 1 : Prenum;
scrollup((P(P_SS) < Rows) ? P(P_SS) : Rows - 1);
onedown((P(P_SS) < Rows) ? P(P_SS) : Rows - 1);
break;
case CTRL('U'):
CLEAROP;
if (Prenum)
P(P_SS) = (Prenum > Rows - 1) ? Rows - 1 : Prenum;
scrolldown((P(P_SS) < Rows) ? P(P_SS) : Rows - 1);
oneup((P(P_SS) < Rows) ? P(P_SS) : Rows - 1);
break;
case CTRL('F'):
CLEAROP;
if (nextline(Topchar) == NULL) {
beep();
break;
}
Prenum = DEFAULT1(Prenum);
while (Prenum > 0) {
*Curschar = *prevline(Botchar);
*Topchar = *Curschar;
Topchar->index = 0;
Update_Botchar();
Prenum--;
}
beginline(TRUE);
s_clear();
break;
case CTRL('B'):
CLEAROP;
if (prevline(Topchar) == NULL) {
beep();
break;
}
Prenum = DEFAULT1(Prenum);
while (Prenum > 0) {
*Curschar = *Topchar;
n = Rows - 1;
{
LPtr *lp = Curschar;
int l = 0;
while ((l < n) && (lp != NULL)) {
l += plines(lp->linep->s);
*Topchar = *lp;
lp = prevline(lp);
}
}
Topchar->index = 0;
Prenum--;
}
beginline(TRUE);
s_clear();
break;
case CTRL('E'):
CLEAROP;
scrollup(DEFAULT1(Prenum));
if (LINEOF(Curschar) < LINEOF(Topchar))
Curschar->linep = Topchar->linep;
break;
case CTRL('Y'):
CLEAROP;
scrolldown(DEFAULT1(Prenum));
Update_Botchar();
if (LINEOF(Curschar) >= LINEOF(Botchar)) {
LPtr *lp;
lp = prevline(Botchar);
if (lp == NULL)
lp = Topchar;
Curschar->linep = lp->linep;
}
break;
case 'z':
CLEAROP;
S_CHECK_TOPCHAR_AND_BOTCHAR;
switch (vgetc()) {
case NL: /* put Curschar at top of screen */
case CR:
*Topchar = *Curschar;
Topchar->index = 0;
break;
case '.': /* put Curschar in middle of screen */
n = Rows / 2;
goto dozcmd;
case '-': /* put Curschar at bottom of screen */
n = Rows - 1;
/* FALLTHROUGH */
dozcmd:
{
register LPtr *lp = Curschar;
register int l = 0;
while ((l < n) && (lp != NULL)) {
l += plines(lp->linep->s);
*Topchar = *lp;
lp = prevline(lp);
}
}
Topchar->index = 0;
break;
default:
beep();
}
break;
case CTRL('G'):
CLEAROP;
fileinfo();
break;
case 'G':
mtype = MLINE;
*Curschar = *gotoline(Prenum);
if (!UndoInProgress) {
beginline(TRUE);
S_CHECK_TOPCHAR_AND_BOTCHAR;
}
break;
case 'H':
mtype = MLINE;
*Curschar = *Topchar;
for (n = Prenum; n && onedown(1); n--);
beginline(TRUE);
break;
case 'M':
mtype = MLINE;
*Curschar = *Topchar;
for (n = 0; n < Rows / 2 && onedown(1); n++);
beginline(TRUE);
break;
case 'L':
mtype = MLINE;
*Curschar = *prevline(Botchar);
for (n = Prenum; n && oneup(1); n--);
beginline(TRUE);
break;
case 'l':
case K_RARROW:
case ' ':
mtype = MCHAR;
mincl = FALSE;
n = DEFAULT1(Prenum);
while (n--) {
if (!oneright()) {
if (operator != DELETE && operator != CHANGE) {
beep();
} else {
if (lineempty(Curschar)) {
CLEAROP;
beep();
} else {
mincl = TRUE;
}
}
break;
}
}
set_want_col = TRUE;
break;
case 'h':
case K_LARROW:
case CTRL('H'):
mtype = MCHAR;
mincl = FALSE;
Prenum = DEFAULT1(Prenum);
n = Prenum;
while (n--) {
if (!oneleft()) {
if (operator != DELETE && operator != CHANGE) {
beep();
} else if (Prenum == 1) {
CLEAROP;
beep();
}
break;
}
}
set_want_col = TRUE;
break;
case '-':
flag = TRUE;
/* FALLTHROUGH */
case 'k':
case K_UARROW:
case CTRL('P'):
mtype = MLINE;
if (!oneup(DEFAULT1(Prenum))) {
CLEAROP;
beep();
} else if (flag)
beginline(TRUE);
break;
case '+':
case CR:
case NL:
flag = TRUE;
/* FALLTHROUGH */
case 'j':
case K_DARROW:
case CTRL('N'):
mtype = MLINE;
if (!onedown(DEFAULT1(Prenum))) {
CLEAROP;
beep();
} else if (flag)
beginline(TRUE);
break;
/*
* This is a strange motion command that helps make operators more
* logical. It is actually implemented, but not documented in the
* real 'vi'. This motion command actually refers to "the current
* line". Commands like "dd" and "yy" are really an alternate form of
* "d_" and "y_". It does accept a count, so "d3_" works to delete 3
* lines.
*/
case '_':
lineop:
mtype = MLINE;
if (!onedown(DEFAULT1(Prenum) - 1)) {
CLEAROP;
beep();
} else
beginline(TRUE);
break;
case '|':
mtype = MCHAR;
mincl = TRUE;
beginline(FALSE);
if (Prenum > 0)
coladvance(Curschar, Prenum - 1);
Curswant = Prenum - 1;
break;
case CTRL(']'): /* :ta to current identifier */
CLEAROP;
{
char ch;
LPtr save;
save = *Curschar;
/*
* First back up to start of identifier. This doesn't match the
* real vi but I like it a little better and it shouldn't bother
* anyone.
*/
ch = gchar(Curschar);
while (IDCHAR(ch)) {
if (!oneleft())
break;
ch = gchar(Curschar);
}
if (!IDCHAR(ch))
oneright();
stuffReadbuff(":ta ");
/*
* Now grab the chars in the identifier
*/
ch = gchar(Curschar);
while (IDCHAR(ch)) {
stuffReadbuff(mkstr(ch));
if (!oneright())
break;
ch = gchar(Curschar);
}
stuffReadbuff("\n");
*Curschar = save; /* restore, in case of error */
}
break;
case '%':
S_CHECK_TOPCHAR_AND_BOTCHAR;
mtype = MCHAR;
mincl = TRUE;
{
LPtr *pos;
if ((pos = showmatch()) == NULL) {
CLEAROP;
beep();
} else {
setpcmark();
*Curschar = *pos;
set_want_col = TRUE;
}
}
break;
/*
* Word Motions
*/
case 'B':
type = 1;
/* FALLTHROUGH */
case 'b':
mtype = MCHAR;
mincl = FALSE;
set_want_col = TRUE;
for (n = DEFAULT1(Prenum); n > 0; n--) {
LPtr *pos;
if ((Curschar->linep->prev == Filetop->linep)
&& (Curschar->index == 0)) {
CLEAROP;
beep();
break;
}
pos = bck_word(Curschar, type);
if (pos == NULL) {
CLEAROP;
beep();
*Curschar = *gotoline(1); /* goto top of file */
} else
*Curschar = *pos;
}
break;
case 'W':
type = 1;
/* FALLTHROUGH */
case 'w':
/*
* This is a little strange. To match what the real vi does, we
* effectively map 'cw' to 'ce', and 'cW' to 'cE'. This seems
* impolite at first, but it's really more what we mean when we say
* 'cw'.
*/
if (operator == CHANGE)
goto do_e_cmd;
mtype = MCHAR;
mincl = FALSE;
set_want_col = TRUE;
for (n = DEFAULT1(Prenum); n > 0; n--) {
LPtr *pos;
if ((pos = fwd_word(Curschar, type)) == NULL) {
CLEAROP;
beep();
break;
} else
*Curschar = *pos;
}
if (operator == DELETE && DEFAULT1(Prenum) == 1) {
if (LINEOF(&startop) != LINEOF(Curschar)) {
*Curschar = startop;
while (oneright());
mincl = TRUE;
}
}
break;
case 'E':
type = 1;
/* FALLTHROUGH */
case 'e':
do_e_cmd:
mtype = MCHAR;
mincl = TRUE;
set_want_col = TRUE;
if (c == 'e' || c == 'E') {
if (inc(Curschar) == -1) {
CLEAROP;
beep();
break;
}
}
for (n = DEFAULT1(Prenum); n > 0; n--) {
LPtr *pos;
if ((pos = end_word(Curschar, type)) == NULL) {
CLEAROP;
beep();
break;
} else
*Curschar = *pos;
}
break;
case '$':
mtype = MCHAR;
mincl = TRUE;
while (oneright());
Curswant = 999; /* so we stay at the end */
break;
case '^':
flag = TRUE;
/* FALLTHROUGH */
case '0':
mtype = MCHAR;
mincl = TRUE;
beginline(flag);
break;
case 'R':
ResetBuffers();
AppendToRedobuff("R");
CLEAROP;
n = RowNumber(Curschar);
AppendPositionToUndobuff(Curschar->index, n);
AppendPositionToUndoUndobuff(Curschar->index, n);
AppendToUndoUndobuff("R");
last_command = 'R';
startinsert(FALSE);
break;
case 'A':
set_want_col = TRUE;
while (oneright());
ResetBuffers();
AppendToRedobuff("A");
goto doAPPENDcmd;
case 'a':
ResetBuffers();
AppendToRedobuff("a");
doAPPENDcmd:
CLEAROP;
/* Works just like an 'i'nsert on the next character. */
n = RowNumber(Curschar);
AppendPositionToUndoUndobuff(Curschar->index, n);
AppendToUndoUndobuff("a");
if (!lineempty(Curschar))
inc(Curschar);
n = RowNumber(Curschar);
AppendPositionToUndobuff(Curschar->index, n);
startinsert(FALSE);
break;
case 'I':
beginline(TRUE);
ResetBuffers();
AppendToRedobuff("I");
goto doINSERTcmd;
/* FALLTHROUGH */
case 'i':
case K_INSERT:
ResetBuffers();
AppendToRedobuff("i");
doINSERTcmd:
CLEAROP;
n = RowNumber(Curschar);
AppendPositionToUndobuff(Curschar->index, n);
AppendPositionToUndoUndobuff(Curschar->index, n);
AppendToUndoUndobuff("i");
startinsert(FALSE);
break;
case 'o':
CLEAROP;
ResetBuffers();
n = RowNumber(Curschar);
AppendToRedobuff("o");
AppendPositionToUndobuff(Curschar->index, n);
AppendPositionToUndoUndobuff(Curschar->index, n);
AppendToUndoUndobuff("o");
if (OpenForward(!RedrawingDisabled))
startinsert(TRUE);
last_command = 'o';
break;
case 'O':
CLEAROP;
ResetBuffers();
n = RowNumber(Curschar);
AppendToRedobuff("O");
AppendPositionToUndobuff(Curschar->index, n);
AppendPositionToUndoUndobuff(Curschar->index, n);
AppendToUndoUndobuff("O");
if (OpenBackward(!RedrawingDisabled))
startinsert(TRUE);
last_command = 'O';
break;
case 'd':
if (operator == DELETE) /* handle 'dd' */
goto lineop;
if (Prenum != 0)
opnum = Prenum;
startop = *Curschar;
operator = DELETE;
break;
/*
* Some convenient abbreviations...
*/
case 'x':
if (Prenum)
stuffnumReadbuff(Prenum);
stuffReadbuff("dl");
break;
case 'X':
if (Prenum)
stuffnumReadbuff(Prenum);
stuffReadbuff("dh");
break;
case 'D':
stuffReadbuff("d$");
break;
case 'Y':
if (Prenum)
stuffnumReadbuff(Prenum);
stuffReadbuff("yy");
break;
case 'C':
stuffReadbuff("c$");
break;
case 'c':
if (operator == CHANGE) { /* handle 'cc' */
CLEAROP;
stuffReadbuff("0c$");
break;
}
if (Prenum != 0)
opnum = Prenum;
startop = *Curschar;
operator = CHANGE;
break;
case 'y':
if (operator == YANK) /* handle 'yy' */
goto lineop;
if (Prenum != 0)
opnum = Prenum;
startop = *Curschar;
operator = YANK;
break;
case ENABLE_REDRAWING:
RedrawingDisabled = FALSE;
S_NOT_VALID;
break;
case 'p':
if (Yankbuffptr != NULL) {
doput(FORWARD);
stuffReadbuff(ENABLE_REDRAWING_STR);
RedrawingDisabled = TRUE;
} else
beep();
break;
case 'P':
if (Yankbuffptr != NULL) {
doput(BACKWARD);
stuffReadbuff(ENABLE_REDRAWING_STR);
RedrawingDisabled = TRUE;
} else
beep();
break;
case '>':
if (operator == RSHIFT) /* handle >> */
goto lineop;
if (operator == LSHIFT) {
CLEAROP;
beep();
break;
}
if (Prenum != 0)
opnum = Prenum;
startop = *Curschar; /* save current position */
operator = RSHIFT;
break;
case '<':
if (operator == LSHIFT) /* handle << */
goto lineop;
if (operator == RSHIFT) {
CLEAROP;
beep();
break;
}
if (Prenum != 0)
opnum = Prenum;
startop = *Curschar; /* save current position */
operator = LSHIFT;
break;
case 's': /* substitute characters */
if (Prenum)
stuffnumReadbuff(Prenum);
stuffReadbuff("cl");
break;
case '?':
case '/':
case ':':
CLEAROP;
readcmdline(c, (char *) NULL);
break;
case 'n':
mtype = MCHAR;
mincl = FALSE;
set_want_col = TRUE;
if (!repsearch(0)) {
CLEAROP;
beep();
}
break;
case 'N':
mtype = MCHAR;
mincl = FALSE;
set_want_col = TRUE;
if (!repsearch(1)) {
CLEAROP;
beep();
}
break;
/*
* Character searches
*/
case 'T':
dir = BACKWARD;
/* FALLTHROUGH */
case 't':
type = 1;
goto docsearch;
case 'F':
dir = BACKWARD;
/* FALLTHROUGH */
case 'f':
docsearch:
mtype = MCHAR;
mincl = TRUE;
set_want_col = TRUE;
if ((nchar = vgetc()) == ESC) /* search char */
break;
if (!searchc(nchar, dir, type)) {
CLEAROP;
beep();
}
break;
case ',':
flag = 1;
/* FALLTHROUGH */
case ';':
mtype = MCHAR;
mincl = TRUE;
set_want_col = TRUE;
if (!crepsearch(flag)) {
CLEAROP;
beep();
}
break;
/*
* Function searches
*/
case '[':
dir = BACKWARD;
/* FALLTHROUGH */
case ']':
mtype = MLINE;
set_want_col = TRUE;
if (vgetc() != c) {
CLEAROP;
beep();
break;
}
if (!findfunc(dir)) {
CLEAROP;
beep();
}
break;
/*
* Marks
*/
case 'm':
CLEAROP;
if (!setmark(vgetc()))
beep();
break;
case '\'':
flag = TRUE;
/* FALLTHROUGH */
case '`':
S_CHECK_TOPCHAR_AND_BOTCHAR;
{
LPtr mtmp;
LPtr *mark = getmark(vgetc());
if (mark == NULL) {
CLEAROP;
beep();
} else {
mtmp = *mark;
setpcmark();
*Curschar = mtmp;
if (flag)
beginline(TRUE);
}
mtype = flag ? MLINE : MCHAR;
mincl = TRUE; /* ignored if not MCHAR */
set_want_col = TRUE;
}
break;
case 'r':
CLEAROP;
if (lineempty(Curschar)) { /* Nothing to replace */
beep();
break;
}
nosuspend();
nchar = vgetc();
dosuspend();
if (nchar == ESC) break;
Prenum = DEFAULT1(Prenum);
n = strlen(Curschar->linep->s) - Curschar->index;
if (n < Prenum) {
beep();
break;
}
ResetBuffers();
nn = RowNumber(Curschar);
AppendPositionToUndobuff(Curschar->index, nn);
AppendPositionToUndoUndobuff(Curschar->index, nn);
while (Prenum > 0) {
AppendToRedobuff("r");
AppendToRedobuff(mkstr(nchar));
AppendToUndobuff("r");
AppendToUndobuff(mkstr(gchar(Curschar)));
AppendToUndoUndobuff("r");
AppendToUndoUndobuff(mkstr(nchar));
pchar(Curschar, nchar); /* Change current character. */
if (Prenum > 1) {
oneright();
AppendToRedobuff("l");
AppendToUndobuff("l");
AppendToUndoUndobuff("l");
}
Prenum--;
}
CHANGED;
S_LINE_NOT_VALID;
break;
case '~': /* swap case */
CLEAROP;
if (lineempty(Curschar)) {
beep();
break;
}
ResetBuffers();
n = RowNumber(Curschar);
AppendPositionToUndobuff(Curschar->index, n);
AppendPositionToUndoUndobuff(Curschar->index, n);
Prenum = DEFAULT1(Prenum);
if (Prenum > 0) {
AppendNumberToRedobuff(Prenum);
AppendNumberToUndobuff(Prenum);
AppendNumberToUndoUndobuff(Prenum);
}
AppendToRedobuff("~");
AppendToUndobuff("~");
AppendToUndoUndobuff("~");
while (Prenum > 0) {
c = gchar(Curschar);
if (isalpha(c)) {
if (islower(c))
pchar(Curschar, toupper(c));
else
pchar(Curschar, tolower(c));
}
if (!oneright())
break;
Prenum--;
}
CHANGED;
S_LINE_NOT_VALID;
break;
case UNDO_SHIFTJ:
CLEAROP;
if (UndoInProgress) {
(void) dojoin(FALSE, FALSE);
break;
}
goto doSHIFTJcommand;
case 'J':
CLEAROP;
doSHIFTJcommand:
if (nextline(Curschar) == NULL) { /* on last line */
beep();
break;
}
ResetBuffers();
temp_Curschar = *Curschar;
nn = strlen(Curschar->linep->s);
if (nn < 0)
nn = 0;
n = RowNumber(&temp_Curschar);
AppendToRedobuff("J");
AppendPositionToUndobuff(nn, n);
AppendPositionToUndoUndobuff(0, n);
AppendToUndoUndobuff("J");
if (linewhite(nextline(Curschar))) {
AppendToUndobuff("a\n");
if (!dojoin(FALSE, TRUE)) {
beep();
break;
}
} else if (lineempty(Curschar)) {
AppendToUndobuff("i\n");
if (!dojoin(FALSE, TRUE)) {
beep();
break;
}
} else {
AppendToUndobuff("dli\n");
if (!dojoin(TRUE, TRUE)) {
beep();
break;
}
}
AppendToUndobuff(ESC_STR);
AppendPositionToUndobuff(nn, n);
break;
case K_CGRAVE: /* shorthand command */
CLEAROP;
stuffReadbuff(":e #\n");
break;
case 'Z': /* write, if changed, and exit */
if (vgetc() != 'Z') {
beep();
break;
}
if (Changed) {
if (Filename != NULL) {
if (!writeit(Filename, (LPtr *) NULL, (LPtr *) NULL))
return;
} else {
emsg("No output file");
return;
}
}
getout(0);
break;
case '.':
CLEAROP;
if (Redobuffptr != NULL) {
stuffReadbuff(Redobuff);
stuffReadbuff(ENABLE_REDRAWING_STR);
RedrawingDisabled = TRUE;
} else
beep();
break;
case 'u':
case K_UNDO:
CLEAROP;
if (UndoInProgress) {
p = UndoUndobuff;
UndoUndobuff = Undobuff;
Undobuff = p;
p = UndoUndobuffptr;
UndoUndobuffptr = Undobuffptr;
Undobuffptr = p;
UndoInProgress = FALSE;
RedrawingDisabled = FALSE;
S_NOT_VALID;
} else if (Undobuffptr != NULL) {
stuffReadbuff(Undobuff);
stuffReadbuff("u");
UndoInProgress = TRUE;
RedrawingDisabled = TRUE;
} else {
beep();
}
break;
default:
CLEAROP;
beep();
break;
}
/*
* If an operation is pending, handle it...
*/
if (finish_op) { /* we just finished an operator */
if (operator == NOP) /* ... but it was cancelled */
return;
switch (operator) {
case LSHIFT:
case RSHIFT:
ResetBuffers();
n = RowNumber(&startop);
AppendPositionToUndobuff(startop.index, n);
AppendPositionToUndoUndobuff(startop.index, n);
if (Prenum != 0) {
AppendNumberToRedobuff(Prenum);
AppendNumberToUndobuff(Prenum);
AppendNumberToUndoUndobuff(Prenum);
}
AppendToRedobuff((operator == LSHIFT) ? "<" : ">");
AppendToUndobuff((operator == LSHIFT) ? ">" : "<");
AppendToUndoUndobuff((operator == LSHIFT) ? "<" : ">");
AppendToRedobuff(mkstr(c));
if (c == '>')
AppendToUndobuff("<");
else if (c == '<')
AppendToUndobuff(">");
else
AppendToUndobuff(mkstr(c));
AppendToUndoUndobuff(mkstr(c));
doshift(operator);
break;
case DELETE:
ResetBuffers();
n = RowNumber(&startop);
AppendPositionToUndoUndobuff(startop.index, n);
if (lt(&startop, Curschar))
temp_Curschar = startop;
else
temp_Curschar = *Curschar;
n = RowNumber(&temp_Curschar);
if (Prenum != 0) {
AppendNumberToRedobuff(Prenum);
AppendNumberToUndoUndobuff(Prenum);
}
AppendToRedobuff("d");
AppendToUndoUndobuff("d");
AppendToRedobuff(mkstr(c));
AppendToUndoUndobuff(mkstr(c));
if (nchar != NUL) {
AppendToRedobuff(mkstr(nchar));
AppendToUndoUndobuff(mkstr(nchar));
}
AppendPositionToUndobuff(temp_Curschar.index, n);
dodelete(!UndoInProgress, !UndoInProgress, !UndoInProgress);
AppendPositionToUndobuff(temp_Curschar.index, n);
break;
case YANK:
ResetBuffers(); /* no redo/undo/(undo of undo) on yank... */
if (!doyank())
msg("yank buffer exceeded");
if (!ybcrossline)
*Curschar = startop;
else if (lt(&startop, Curschar))
*Curschar = startop;
break;
case CHANGE:
ResetBuffers();
n = RowNumber(&startop);
AppendPositionToUndoUndobuff(startop.index, n);
if (lt(&startop, Curschar))
temp_Curschar = startop;
else
temp_Curschar = *Curschar;
n = RowNumber(&temp_Curschar);
if (mtype == MLINE)
AppendPositionToUndobuff(0, n);
else
AppendPositionToUndobuff(temp_Curschar.index, n);
if (Prenum != 0) {
AppendNumberToRedobuff(Prenum);
AppendNumberToUndoUndobuff(Prenum);
}
AppendToRedobuff("c");
AppendToUndoUndobuff("c");
AppendToRedobuff(mkstr(c));
AppendToUndoUndobuff(mkstr(c));
if (nchar != NUL) {
AppendToRedobuff(mkstr(nchar));
AppendToUndoUndobuff(mkstr(nchar));
}
dochange();
last_command = 'c';
break;
default:
beep();
}
operator = NOP;
}
}
/*
* tabinout(shift_type, num)
*
* If shift_type == RSHIFT, add a tab to the begining of the next num lines;
* otherwise delete a tab from the beginning of the next num lines.
*/
static void
tabinout(shift_type, num)
int shift_type;
int num;
{
LPtr *p;
beginline(FALSE);
while (num-- > 0) {
beginline(FALSE);
if (shift_type == RSHIFT)
inschar(TAB);
else {
if (gchar(Curschar) == TAB)
delchar(TRUE, FALSE);
}
if (num > 0) {
if ((p = nextline(Curschar)) != NULL)
*Curschar = *p;
else
break;
}
}
}
/*
* doshift - handle a shift operation
*/
static void
doshift(op)
int op;
{
LPtr top, bot;
int nlines;
top = startop;
bot = *Curschar;
if (lt(&bot, &top))
pswap(top, bot);
nlines = cntllines(&top, &bot);
*Curschar = top;
tabinout(op, nlines);
/*
* The cursor position afterward is the prior of the two positions.
*/
*Curschar = top;
/*
* If we were on the last char of a line that got shifted left, then move
* left one so we aren't beyond the end of the line
*/
if (gchar(Curschar) == NUL && Curschar->index > 0)
Curschar->index--;
if (op == RSHIFT)
oneright();
else
oneleft();
S_NOT_VALID;
if (nlines > P(P_RP))
smsg("%d lines %ced", nlines, (op == RSHIFT) ? '>' : '<');
}
/*
* dodelete - handle a delete operation
*/
static void
dodelete(redraw, setup_for_undo, try_to_yank)
bool_t redraw;
bool_t setup_for_undo;
bool_t try_to_yank;
{
LPtr top, bot;
int nlines;
int n;
/*
* 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 (try_to_yank) {
if (!doyank()) {
msg("yank buffer exceeded: press <y> to confirm");
if (vgetc() != 'y') {
emsg("delete aborted");
*Curschar = startop;
return;
}
}
}
top = startop;
bot = *Curschar;
if (lt(&bot, &top))
pswap(top, bot);
*Curschar = top;
nlines = cntllines(&top, &bot);
if (mtype == MLINE) {
if (operator == CHANGE) {
last_command_char = 'a';
delline(nlines - 1);
Curschar->index = 0;
while (delchar(TRUE, FALSE));
} else {
if ((Filetop->linep->next == top.linep) &&
(bot.linep->next == Fileend->linep))
last_command_char = 'a';
else if (bot.linep->next == Fileend->linep)
last_command_char = 'o';
else
last_command_char = 'O';
if (setup_for_undo)
AppendToUndobuff(mkstr(last_command_char));
delline(nlines);
}
} else if (top.linep == bot.linep) { /* del. within line */
if (!mincl)
dec(&bot);
if (endofline(&bot))
last_command_char = 'a';
else
last_command_char = 'i';
if (setup_for_undo)
AppendToUndobuff(mkstr(last_command_char));
n = bot.index - top.index + 1;
while (n--)
if (!delchar(TRUE, FALSE))
break;
} else { /* del. between lines */
if (endofline(&top)) {
if (nextline(&top)) {
if (lineempty(nextline(&top)))
last_command_char = 'a';
else
last_command_char = 'i';
} else {
last_command_char = 'a';
}
} else {
last_command_char = 'i';
}
if (setup_for_undo)
AppendToUndobuff(mkstr(last_command_char));
n = Curschar->index;
while (Curschar->index >= n)
if (!delchar(TRUE, FALSE))
break;
top = *Curschar;
*Curschar = *nextline(Curschar);
delline(nlines - 2);
Curschar->index = 0;
n = bot.index;
if (!mincl)
n--;
while (n-- >= 0)
if (!delchar(TRUE, FALSE))
break;
*Curschar = top;
dojoin(FALSE, FALSE);
}
if (mtype == MCHAR && nlines == 1 && redraw && P(P_NU) == FALSE) {
S_LINE_NOT_VALID;
} else {
S_NOT_VALID;
}
if (nlines > P(P_RP))
smsg("%d fewer lines", nlines);
if (setup_for_undo) {
AppendToUndobuff(Yankbuff);
AppendToUndobuff(ESC_STR);
}
}
/*
* dochange - handle a change operation
*/
static void
dochange()
{
LPtr l;
if (lt(Curschar, &startop))
l = *Curschar;
else
l = startop;
dodelete(FALSE, FALSE, !UndoInProgress);
if ((l.index > Curschar->index) && !lineempty(Curschar))
inc(Curschar);
startinsert(FALSE);
}
static bool_t
doyank()
{
LPtr top, bot;
char *ybend = &Yankbuff[YANKSIZE - 1];
int nlines;
Yankbuffptr = Yankbuff;
top = startop;
bot = *Curschar;
if (lt(&bot, &top))
pswap(top, bot);
nlines = cntllines(&top, &bot);
ybtype = mtype; /* set the yank buffer type */
ybcrossline = FALSE;
if (LINEOF(&top) != LINEOF(&bot))
ybcrossline = TRUE;
if (mtype == MLINE) {
ybcrossline = TRUE;
top.index = 0;
bot.index = strlen(bot.linep->s);
/*
* The following statement checks for the special case of yanking a
* blank line at the beginning of the file. If not handled right, we
* yank an extra char (a newline).
*/
if (dec(&bot) == -1) {
*Yankbuff = NUL;
Yankbuffptr = NULL;
return TRUE;
}
} else {
if (!mincl)
if (!equal(&top, &bot))
dec(&bot);
}
for (; ltoreq(&top, &bot); inc(&top)) {
*Yankbuffptr = (gchar(&top) != NUL) ? gchar(&top) : NL;
Yankbuffptr++;
if (Yankbuffptr >= ybend) {
*Yankbuffptr = NUL;
msg("yank too big for buffer");
ybtype = MBAD;
return FALSE;
}
}
*Yankbuffptr = NUL;
if (operator == YANK)
if (nlines > P(P_RP))
smsg("%d lines yanked", nlines);
return TRUE;
}
static void
doput(dir)
int dir;
{
bool_t type;
if (ybtype == MBAD) {
beep();
return;
}
type = (ybtype == MCHAR);
if (dir == FORWARD)
stuffReadbuff(type ? "a" : "o");
else
stuffReadbuff(type ? "i" : "O");
stuffReadbuff(Yankbuff);
stuffReadbuff(ESC_STR);
if (ybtype != MCHAR)
stuffReadbuff("^");
}
static void
startinsert(startln)
int startln; /* if set, insert at start of line */
{
extern void nosuspend(void);
extern void dosuspend(void);
nosuspend(); /* turn off the suspend character in insert mode */
*Insstart = *Curschar;
if (startln) {
Insstart->index = 0;
}
*Insbuff = NUL;
Insbuffptr = NULL;
State = INSERT;
if (P(P_MO)) {
if (last_command == 'R')
msg("Replace Mode");
else
msg("Insert Mode");
}
}
void
ResetBuffers()
{
if (UndoInProgress)
return;
*Redobuff = NUL;
Redobuffptr = NULL;
*Undobuff = NUL;
Undobuffptr = NULL;
*UndoUndobuff = NUL;
UndoUndobuffptr = NULL;
}
void
AppendToInsbuff(s)
char *s;
{
if (UndoInProgress)
return;
if (Insbuffptr == NULL) {
if ((strlen(s) + 1) < INSERT_SIZE) {
strcpy(Insbuff, s);
Insbuffptr = Insbuff;
return;
}
} else if ((strlen(Insbuff) + strlen(s) + 1) < INSERT_SIZE) {
strcat(Insbuff, s);
return;
}
emsg("Couldn't AppendToInsbuff() - clearing Insbuff\n");
*Insbuff = NUL;
Insbuffptr = NULL;
}
void
AppendToRedobuff(s)
char *s;
{
if (UndoInProgress)
return;
if (Redobuffptr == (char *) (-2)) {
return;
}
if (Redobuffptr == (char *) (-1)) {
Redobuffptr = (char *) (-2);
emsg("Couldn't AppendToRedobuff() - Redobuff corrupt");
return;
}
if (Redobuffptr == NULL) {
if ((strlen(s) + 1) < REDO_UNDO_SIZE) {
strcpy(Redobuff, s);
Redobuffptr = Redobuff;
return;
}
} else if ((strlen(Redobuff) + strlen(s) + 1) < REDO_UNDO_SIZE) {
strcat(Redobuff, s);
return;
}
emsg("Couldn't AppendToRedobuff() - clearing Redobuff");
*Redobuff = NUL;
Redobuffptr = (char *) (-1);
}
void
AppendNumberToRedobuff(n)
int n;
{
char buf[32];
if (UndoInProgress)
return;
sprintf(buf, "%d", n);
AppendToRedobuff(buf);
}
void
AppendToUndobuff(s)
char *s;
{
if (UndoInProgress)
return;
if (Undobuffptr == (char *) (-2)) {
return;
}
if (Undobuffptr == (char *) (-1)) {
Undobuffptr = (char *) (-2);
emsg("Couldn't AppendToUndobuff() - Undobuff corrupt");
return;
}
if (Undobuffptr == NULL) {
if ((strlen(s) + 1) < REDO_UNDO_SIZE) {
strcpy(Undobuff, s);
Undobuffptr = Undobuff;
return;
}
} else if ((strlen(Undobuff) + strlen(s) + 1) < REDO_UNDO_SIZE) {
strcat(Undobuff, s);
return;
}
emsg("Couldn't AppendToUndobuff() - clearing Undobuff");
*Undobuff = NUL;
Undobuffptr = (char *) (-1);
}
void
AppendNumberToUndobuff(n)
int n;
{
char buf[32];
if (UndoInProgress)
return;
sprintf(buf, "%d", n);
AppendToUndobuff(buf);
}
static bool_t
dojoin(leading_space, strip_leading_spaces)
bool_t leading_space;
bool_t strip_leading_spaces;
{
}
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