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lib_termcap.c
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2002-10-24
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/****************************************************************************
* Copyright (c) 1998-2001,2002 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
* *
* some of the code in here was contributed by: *
* Magnus Bengtsson, d6mbeng@dtek.chalmers.se (Nov'93) *
****************************************************************************/
#define __INTERNAL_CAPS_VISIBLE
#include <curses.priv.h>
#include <termcap.h>
#include <tic.h>
#include <ctype.h>
#include <term_entry.h>
MODULE_ID("$Id: lib_termcap.c,v 1.43 2002/05/25 12:24:13 tom Exp $")
#define CSI 233
#define ESC 033 /* ^[ */
#define L_BRACK '['
#define SHIFT_OUT 017 /* ^N */
NCURSES_EXPORT_VAR(char *) UP = 0;
NCURSES_EXPORT_VAR(char *) BC = 0;
static char *fix_me = 0;
static char *
set_attribute_9(int flag)
{
const char *result;
if ((result = tparm(set_attributes, 0, 0, 0, 0, 0, 0, 0, 0, flag)) == 0)
result = "";
return strdup(result);
}
static int
is_csi(char *s)
{
if (UChar(s[0]) == CSI)
return 1;
else if (s[0] == ESC && s[1] == L_BRACK)
return 2;
return 0;
}
static char *
skip_zero(char *s)
{
if (s[0] == '0') {
if (s[1] == ';')
s += 2;
else if (isalpha(UChar(s[1])))
s += 1;
}
return s;
}
static bool
similar_sgr(char *a, char *b)
{
int csi_a = is_csi(a);
int csi_b = is_csi(b);
if (csi_a != 0 && csi_b != 0 && csi_a == csi_b) {
a += csi_a;
b += csi_b;
if (*a != *b) {
a = skip_zero(a);
b = skip_zero(b);
}
}
return strcmp(a, b) == 0;
}
/***************************************************************************
*
* tgetent(bufp, term)
*
* In termcap, this function reads in the entry for terminal `term' into the
* buffer pointed to by bufp. It must be called before any of the functions
* below are called.
* In this terminfo emulation, tgetent() simply calls setupterm() (which
* does a bit more than tgetent() in termcap does), and returns its return
* value (1 if successful, 0 if no terminal with the given name could be
* found, or -1 if no terminal descriptions have been installed on the
* system). The bufp argument is ignored.
*
***************************************************************************/
NCURSES_EXPORT(int)
tgetent(char *bufp GCC_UNUSED, const char *name)
{
int errcode;
T((T_CALLED("tgetent()")));
setupterm((NCURSES_CONST char *) name, STDOUT_FILENO, &errcode);
PC = 0;
UP = 0;
BC = 0;
fix_me = 0;
if (errcode == 1) {
if (cursor_left)
if ((backspaces_with_bs = !strcmp(cursor_left, "\b")) == 0)
backspace_if_not_bs = cursor_left;
/* we're required to export these */
if (pad_char != NULL)
PC = pad_char[0];
if (cursor_up != NULL)
UP = cursor_up;
if (backspace_if_not_bs != NULL)
BC = backspace_if_not_bs;
/*
* While 'sgr0' is the "same" as termcap 'me', there is a compatibility
* issue. The sgr/sgr0 capabilities include setting/clearing alternate
* character set mode. A termcap application cannot use sgr, so sgr0
* strings that reset alternate character set mode will be
* misinterpreted. Here, we remove those from the more common
* ISO/ANSI/VT100 entries, which have sgr0 agreeing with sgr.
*/
if (exit_attribute_mode != 0
&& set_attributes != 0) {
char *on = set_attribute_9(1);
char *off = set_attribute_9(0);
char *tmp;
size_t i, j, k;
if (similar_sgr(off, exit_attribute_mode)
&& !similar_sgr(off, on)) {
TR(TRACE_DATABASE, ("adjusting sgr0 : %s", _nc_visbuf(off)));
FreeIfNeeded(fix_me);
fix_me = off;
for (i = 0; off[i] != '\0'; ++i) {
if (on[i] != off[i]) {
j = strlen(off);
k = strlen(on);
while (j != 0
&& k != 0
&& off[j - 1] == on[k - 1]) {
--j, --k;
}
while (off[j] != '\0') {
off[i++] = off[j++];
}
off[i] = '\0';
break;
}
}
/* SGR 10 would reset to normal font */
if ((i = is_csi(off)) != 0
&& off[strlen(off) - 1] == 'm') {
tmp = skip_zero(off + i);
if (tmp[0] == '1'
&& skip_zero(tmp + 1) != tmp + 1) {
i = tmp - off;
if (off[i - 1] == ';')
i--;
j = skip_zero(tmp + 1) - off;
while (off[j] != '\0') {
off[i++] = off[j++];
}
off[i] = '\0';
}
}
TR(TRACE_DATABASE, ("...adjusted me : %s", _nc_visbuf(fix_me)));
if (!strcmp(fix_me, exit_attribute_mode)) {
TR(TRACE_DATABASE, ("...same result, discard"));
free(fix_me);
fix_me = 0;
}
}
free(on);
}
(void) baudrate(); /* sets ospeed as a side-effect */
/* LINT_PREPRO
#if 0*/
#include <capdefaults.c>
/* LINT_PREPRO
#endif*/
}
returnCode(errcode);
}
/***************************************************************************
*
* tgetflag(str)
*
* Look up boolean termcap capability str and return its value (TRUE=1 if
* present, FALSE=0 if not).
*
***************************************************************************/
NCURSES_EXPORT(int)
tgetflag(NCURSES_CONST char *id)
{
int i;
T((T_CALLED("tgetflag(%s)"), id));
if (cur_term != 0) {
TERMTYPE *tp = &(cur_term->type);
for_each_boolean(i, tp) {
const char *capname = ExtBoolname(tp, i, boolcodes);
if (!strncmp(id, capname, 2)) {
/* setupterm forces invalid booleans to false */
returnCode(tp->Booleans[i]);
}
}
}
returnCode(0); /* Solaris does this */
}
/***************************************************************************
*
* tgetnum(str)
*
* Look up numeric termcap capability str and return its value, or -1 if
* not given.
*
***************************************************************************/
NCURSES_EXPORT(int)
tgetnum(NCURSES_CONST char *id)
{
int i;
T((T_CALLED("tgetnum(%s)"), id));
if (cur_term != 0) {
TERMTYPE *tp = &(cur_term->type);
for_each_number(i, tp) {
const char *capname = ExtNumname(tp, i, numcodes);
if (!strncmp(id, capname, 2)) {
if (!VALID_NUMERIC(tp->Numbers[i]))
returnCode(ABSENT_NUMERIC);
returnCode(tp->Numbers[i]);
}
}
}
returnCode(ABSENT_NUMERIC);
}
/***************************************************************************
*
* tgetstr(str, area)
*
* Look up string termcap capability str and return a pointer to its value,
* or NULL if not given.
*
***************************************************************************/
NCURSES_EXPORT(char *)
tgetstr(NCURSES_CONST char *id, char **area)
{
int i;
char *result = NULL;
T((T_CALLED("tgetstr(%s,%p)"), id, area));
if (cur_term != 0) {
TERMTYPE *tp = &(cur_term->type);
for_each_string(i, tp) {
const char *capname = ExtStrname(tp, i, strcodes);
if (!strncmp(id, capname, 2)) {
result = tp->Strings[i];
TR(TRACE_DATABASE, ("found match : %s", _nc_visbuf(result)));
/* setupterm forces canceled strings to null */
if (VALID_STRING(result)) {
if (result == exit_attribute_mode
&& fix_me != 0) {
result = fix_me;
TR(TRACE_DATABASE, ("altered to : %s", _nc_visbuf(result)));
}
if (area != 0
&& *area != 0) {
(void) strcpy(*area, result);
*area += strlen(*area) + 1;
}
}
break;
}
}
}
returnPtr(result);
}