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freebsd/lib/libncurses/lib_mvcur.c
1995-05-30 05:51:47 +00:00

701 lines
15 KiB
C

/*---------------------------------------------------------------------------
*
* lib_mvcur.c
*
* The routine mvcur() etc.
*
* last edit-date: [Wed Jun 16 14:13:22 1993]
*
* -hm conversion from termcap -> terminfo
* -hm optimization debugging
* -hm zeyd's ncurses 0.7 update
* -hm eat_newline_glitch bugfix
* -hm hpux lint'ing ..
*
*---------------------------------------------------------------------------*/
/* This work is copyrighted. See COPYRIGHT.OLD & COPYRIGHT.NEW for *
* details. If they are missing then this copy is in violation of *
* the copyright conditions. */
#include <string.h>
#include <stdlib.h>
#include "terminfo.h"
#include "curses.priv.h"
#ifndef OPT_MVCUR
/*
**
** mvcur(oldrow, oldcol, newrow, newcol)
** A hack for terminals that are smart enough
** to know how to move cursor.
** There is still a bug in the alternative long-
** winded code.
**
*/
int mvcur(int oldrow, int oldcol, int newrow, int newcol)
{
T(("mvcur(%d,%d,%d,%d) called", oldrow, oldcol, newrow, newcol));
if(!cursor_address)
return ERR;
newrow %= lines;
newcol %= columns;
if (cursor_address)
putp(tparm(cursor_address, newrow, newcol));
return OK;
}
#else
#define BUFSIZE 128 /* size of strategy buffer */
struct Sequence
{
int vec[BUFSIZE]; /* vector of operations */
int *end; /* end of vector */
int cost; /* cost of vector */
};
static void row(struct Sequence *outseq, int orow, int nrow);
static void column(struct Sequence *outseq, int ocol, int ncol);
static void simp_col(struct Sequence *outseq, int oc, int nc);
static void zero_seq(struct Sequence *seq);
static void add_seq(struct Sequence *seq1, struct Sequence *seq2);
static void out_seq(struct Sequence *seq);
static void update_ops(void);
static void init_costs(int costs[]);
static int countc(char ch);
static void add_op(struct Sequence *seq, int op, ...);
static char *sequence(int op);
static int c_count; /* used for counting tputs output */
#define INFINITY 1000 /* biggest, impossible sequence cost */
#define NUM_OPS 16 /* num. term. control sequences */
#define NUM_NPARM 9 /* num. ops wo/ parameters */
/* operator indexes into op_info */
#define CARRIAGE_RETURN 0 /* watch out for nl mapping */
#define CURS_DOWN 1
#define CURS_HOME 2
#define CURS_LEFT 3
#define CURS_RIGHT 4
#define CURS_TO_LL 5
#define CURS_UP 6
#define TAB 7
#define BACK_TAB 8
#define ROW_ADDR 9
#define COL_ADDR 10
#define P_DOWN_CURS 11
#define P_LEFT_CURS 12
#define P_RIGHT_CURS 13
#define P_UP_CURS 14
#define CURS_ADDR 15
static bool loc_init = FALSE; /* set if op_info is init'ed */
static bool rel_ok; /* set if we really know where we are */
/*
* op_info[NUM_OPS]
*
* op_info[] contains for operations with no parameters
* the cost of the operation. These ops should be first in the array.
* For operations with parameters, op_info[] contains
* the negative of the number of parameters.
*/
static int op_info[NUM_OPS] = {
0, /* carriage_return */
0, /* cursor_down */
0, /* cursor_home */
0, /* cursor_left */
0, /* cursor_right */
0, /* cursor_to_ll */
0, /* cursor_up */
0, /* tab */
0, /* back_tab */
-1, /* row_address */
-1, /* column_address */
-1, /* parm_down_cursor */
-1, /* parm_left_cursor */
-1, /* parm_right_cursor */
-1, /* parm_up_cursor */
-2 /* cursor_address */
};
/*
** Make_seq_best(best, try)
**
** Make_seq_best() copies try to best if try->cost < best->cost
**
** fixed the old version, now it really runs .. (-hm/08.04.93)
**
*/
inline void Make_seq_best(struct Sequence *best, struct Sequence *try)
{
if (best->cost > try->cost) {
register int *sptr;
sptr = try->vec; /* src ptr */
best->end = best->vec; /* dst ptr */
while(sptr != try->end) /* copy src -> dst */
*(best->end++) = *(sptr++);
best->cost = try->cost; /* copy cost */
}
}
/*
**
** mvcur(oldrow, oldcol, newrow, newcol)
**
** mvcur() optimally moves the cursor from the position
** specified by (oldrow, oldcol) to (newrow, newcol). If
** (oldrow, oldcol) == (-1, -1), mvcur() does not use relative
** cursor motions. If the coordinates are otherwise
** out of bounds, it mods them into range.
**
** Revisions needed:
** eat_newline_glitch, auto_right_margin
*/
int mvcur(int oldrow, int oldcol, int newrow, int newcol)
{
struct Sequence seqA, seqB, /* allocate work structures */
col0seq, /* sequence to get from col0 to nc */
*best, /* best sequence so far */
*try; /* next try */
bool nlstat = SP->_nl; /* nl-output-mapping in effect ?*/
T(("=============================\nmvcur(%d,%d,%d,%d) called",
oldrow, oldcol, newrow, newcol));
if ((oldrow == newrow) && (oldcol == newcol))
return OK;
if (oldcol == columns-1 && eat_newline_glitch && auto_right_margin) {
putp(tparm(cursor_address, newrow, newcol));
return OK;
}
#if 0
if (nlstat)
nonl();
#endif
update_ops(); /* make sure op_info[] is current */
if (oldrow < 0 || oldcol < 0 || (eat_newline_glitch && oldcol == 0 )) {
rel_ok = FALSE; /* relative ops ok? */
} else {
rel_ok = TRUE;
oldrow %= lines; /* mod values into range */
oldcol %= columns;
}
newrow %= lines;
newcol %= columns;
best = &seqA;
try = &seqB;
/* try out direct cursor addressing */
zero_seq(best);
add_op(best, CURS_ADDR, newrow, newcol);
/* try out independent row/column addressing */
if(rel_ok) {
zero_seq(try);
row(try, oldrow, newrow);
column(try, oldcol, newcol);
Make_seq_best(best, try);
}
zero_seq(&col0seq); /* store seq. to get from c0 to nc */
column(&col0seq, 0, newcol);
if(col0seq.cost < INFINITY) { /* can get from col0 to newcol */
/* try out homing and then row/column */
if (! rel_ok || newcol < oldcol || newrow < oldrow) {
zero_seq(try);
add_op(try, CURS_HOME, 1);
row(try, 0, newrow);
add_seq(try, &col0seq);
Make_seq_best(best, try);
}
/* try out homing to last line and then row/column */
if (! rel_ok || newcol < oldcol || newrow > oldrow) {
zero_seq(try);
add_op(try, CURS_TO_LL, 1);
row(try, lines - 1, newrow);
add_seq(try, &col0seq);
Make_seq_best(best, try);
}
}
out_seq(best);
#if 0
if(nlstat)
nl();
#endif
T(("==================================="));
return OK;
}
/*
** row(outseq, oldrow, newrow)
**
** row() adds the best sequence for moving
** the cursor from oldrow to newrow to seq.
** row() considers row_address, parm_up/down_cursor
** and cursor_up/down.
*/
static void
row(struct Sequence *outseq, /* where to put the output */
int orow, int nrow) /* old, new cursor locations */
{
struct Sequence seqA, seqB,
*best, /* best sequence so far */
*try; /* next try */
int parm_cursor, one_step;
best = &seqA;
try = &seqB;
if (nrow == orow)
return;
if (nrow < orow) {
parm_cursor = P_UP_CURS;
one_step = CURS_UP;
} else {
parm_cursor = P_DOWN_CURS;
one_step = CURS_DOWN;
}
/* try out direct row addressing */
zero_seq(best);
add_op(best, ROW_ADDR, nrow);
/* try out paramaterized up or down motion */
if (rel_ok) {
zero_seq(try);
add_op(try, parm_cursor, abs(orow - nrow));
Make_seq_best(best, try);
}
/* try getting there one step at a time... */
if (rel_ok) {
zero_seq(try);
add_op(try, one_step, abs(orow-nrow));
Make_seq_best(best, try);
}
add_seq(outseq, best);
}
/*
** column(outseq, oldcol, newcol)
**
** column() adds the best sequence for moving
** the cursor from oldcol to newcol to outseq.
** column() considers column_address, parm_left/right_cursor,
** simp_col(), and carriage_return followed by simp_col().
*/
static void column(struct Sequence *outseq, /* where to put the output */
int ocol, int ncol) /* old, new cursor column */
{
struct Sequence seqA, seqB,
*best, *try;
int parm_cursor; /* set to either parm_up/down_cursor */
best = &seqA;
try = &seqB;
if (ncol == ocol)
return;
if (ncol < ocol)
parm_cursor = P_LEFT_CURS;
else
parm_cursor = P_RIGHT_CURS;
/* try out direct column addressing */
zero_seq(best);
add_op(best, COL_ADDR, ncol);
/* try carriage_return then simp_col() */
if(! rel_ok || (ncol < ocol)) {
zero_seq(try);
add_op(try, CARRIAGE_RETURN, 1);
simp_col(try, 0, ncol);
Make_seq_best(best, try);
}
if(rel_ok) {
/* try out paramaterized left or right motion */
zero_seq(try);
add_op(try, parm_cursor, abs(ocol - ncol));
Make_seq_best(best, try);
/* try getting there with simp_col() */
zero_seq(try);
simp_col(try, ocol, ncol);
Make_seq_best(best, try);
}
add_seq(outseq, best);
}
/*
** simp_col(outseq, oldcol, newcol)
**
** simp_col() adds the best simple sequence for getting
** from oldcol to newcol to outseq.
** simp_col() considers (back_)tab and cursor_left/right.
**
** Revisions needed:
** Simp_col asssumes that the cost of a (back_)tab
** is less then the cost of one-stepping to get to the same column.
** Should sometimes use overprinting instead of cursor_right.
*/
static void
simp_col( struct Sequence *outseq, /* place to put sequence */
int oc, int nc) /* old column, new column */
{
struct Sequence seqA, seqB, tabseq,
*best, *try;
int mytab, tabs, onepast,
one_step, opp_step;
onepast = -1;
if (oc == nc)
return;
if(! rel_ok) {
outseq->cost = INFINITY;
return;
}
best = &seqA;
try = &seqB;
if(oc < nc) {
mytab = TAB;
if (init_tabs > 0 && op_info[TAB] < INFINITY) {
tabs = (nc / init_tabs) - (oc / init_tabs);
onepast = ((nc / init_tabs) + 1) * init_tabs;
if (tabs)
oc = onepast - init_tabs; /* consider it done */
} else {
tabs = 0;
}
one_step = CURS_RIGHT;
opp_step = CURS_LEFT;
} else {
mytab = BACK_TAB;
if (init_tabs > 0 && op_info[BACK_TAB] < INFINITY) {
tabs = (oc / init_tabs) - (nc / init_tabs);
onepast = ((nc - 1) / init_tabs) * init_tabs;
if (tabs)
oc = onepast + init_tabs; /* consider it done */
} else {
tabs = 0;
}
one_step = CURS_LEFT;
opp_step = CURS_RIGHT;
}
/* tab as close as possible to nc */
zero_seq(&tabseq);
add_op(&tabseq, mytab, tabs);
/* try extra tab and backing up */
zero_seq(best);
if (onepast >= 0 && onepast < columns) {
add_op(best, mytab, 1);
add_op(best, opp_step, abs(onepast - nc));
} else {
best->cost = INFINITY; /* make sure of next swap */
}
/* try stepping to nc */
zero_seq(try);
add_op(try, one_step, abs(nc - oc));
Make_seq_best(best, try);
if (tabseq.cost < INFINITY)
add_seq(outseq, &tabseq);
add_seq(outseq, best);
}
/*
** zero_seq(seq) empties seq.
** add_seq(seq1, seq2) adds seq1 to seq2.
** out_seq(seq) outputs a sequence.
*/
static void
zero_seq(seq)
struct Sequence *seq;
{
seq->end = seq->vec;
seq->cost = 0;
}
static void
add_seq(struct Sequence *seq1, struct Sequence *seq2)
{
int *vptr;
T(("add_seq(%x, %x)", seq1, seq2));
if(seq1->cost >= INFINITY || seq2->cost >= INFINITY)
seq1->cost = INFINITY;
else {
vptr = seq2->vec;
while (vptr != seq2->end)
*(seq1->end++) = *(vptr++);
seq1->cost += seq2->cost;
}
}
static void
out_seq(struct Sequence *seq)
{
int *opptr, prm[9], ps, p, op;
int count;
char *sequence();
T(("out_seq(%x)", seq));
if (seq->cost >= INFINITY)
return;
for (opptr = seq->vec; opptr < seq->end; opptr++) {
op = *opptr; /* grab operator */
ps = -op_info[op];
if(ps > 0) { /* parameterized */
for (p = 0; p < ps; p++) /* fill in needed parms */
prm[p] = *(++opptr);
putp(tparm(sequence(op),
prm[0], prm[1], prm[2], prm[3], prm[4],
prm[5], prm[6], prm[7], prm[8]));
} else {
count = *(++opptr);
/*rev should save tputs output instead of mult calls */
while (count--) /* do count times */
putp(sequence(op));
}
}
}
/*
** update_ops()
**
** update_ops() makes sure that
** the op_info[] array is updated and initializes
** the cost array for SP if needed.
*/
static void
update_ops()
{
T(("update_ops()"));
if (SP) { /* SP structure exists */
int op;
if (! SP->_costinit) { /* this term not yet assigned costs */
loc_init = FALSE; /* if !SP in the future, new term */
init_costs(SP->_costs); /* fill term costs */
SP->_costinit = TRUE;
}
for (op = 0; op < NUM_NPARM; op++)
op_info[op] = SP->_costs[op]; /* set up op_info */
/* check for newline that might be mapped... */
if (SP->_nlmapping && index(sequence(CURS_DOWN), '\n'))
op_info[CURS_DOWN] = INFINITY;
} else {
if (! loc_init) { /* using local costs */
loc_init = TRUE;
init_costs(op_info); /* set up op_info */
}
/* check for newline that might be mapped... */
if (index(sequence(CURS_DOWN), '\n'))
op_info[CURS_DOWN] = INFINITY;
}
}
/*
** init_costs(costs)
**
** init_costs() fills the array costs[NUM_NPARM]
** with costs calculated by doing tputs() calls.
*/
static void
init_costs(int costs[])
{
int i;
for (i = 0; i < NUM_NPARM; i++) {
if (sequence(i) != (char *) 0) {
c_count = 0;
tputs(sequence(i), 1, countc);
costs[i] = c_count;
} else
costs[i] = INFINITY;
}
}
/*
** countc() increments global var c_count.
*/
static int countc(char ch)
{
return(c_count++);
}
/*
** add_op(seq, op, p0, p1, ... , p8)
**
** add_op() adds the operator op and the appropriate
** number of paramaters to seq. It also increases the
** cost appropriately.
** if op has no parameters, p0 is taken to be a count.
*/
static void add_op(struct Sequence *seq, int op, ...)
{
va_list argp;
int num_ps, p;
T(("adding op %d to sequence", op));
va_start(argp, op);
num_ps = - op_info[op]; /* get parms or -cost */
*(seq->end++) = op;
if (num_ps == (- INFINITY) || sequence(op) == (char *) 0) {
seq->cost = INFINITY;
} else if (num_ps <= 0) { /* no parms, -cost */
int i = va_arg(argp, int);
seq->cost -= i * num_ps; /* ADD count * cost */
*(seq->end++) = i;
} else {
int prm[9];
for (p = 0; p < num_ps; p++)
*(seq->end++) = prm[p] = va_arg(argp, int);
c_count = 0;
tputs(tparm(sequence(op), prm[0], prm[1], prm[2], prm[3], prm[4],
prm[5], prm[6], prm[7], prm[8]), 1, countc);
seq->cost += c_count;
}
va_end(argp);
}
/*
** char *sequence(op)
**
** sequence() returns a pointer to the op's
** terminal control sequence.
*/
static char *sequence(int op)
{
T(("sequence(%d)", op));
switch(op) {
case CARRIAGE_RETURN:
return (carriage_return);
case CURS_DOWN:
return (cursor_down);
case CURS_HOME:
return (cursor_home);
case CURS_LEFT:
return (cursor_left);
case CURS_RIGHT:
return (cursor_right);
case CURS_TO_LL:
return (cursor_to_ll);
case CURS_UP:
return (cursor_up);
case TAB:
return (tab);
case BACK_TAB:
return (back_tab);
case ROW_ADDR:
return (row_address);
case COL_ADDR:
return (column_address);
case P_DOWN_CURS:
return (parm_down_cursor);
case P_LEFT_CURS:
return (parm_left_cursor);
case P_RIGHT_CURS:
return (parm_right_cursor);
case P_UP_CURS:
return (parm_up_cursor);
case CURS_ADDR:
return (cursor_address);
default:
return ((char *) 0);
}
}
#endif