curses.c

/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Timothy C. Stoehr.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)curses.c	8.1 (Berkeley) 5/31/93";
#endif /* not lint */

/*
 * curses.c
 *
 * This source herein may be modified and/or distributed by anybody who
 * so desires, with the following restrictions:
 *    1.)  No portion of this notice shall be removed.
 *    2.)  Credit shall not be taken for the creation of this source.
 *    3.)  This code is not to be traded, sold, or used for personal
 *         gain or profit.
 *
 */

#ifdef CURSES

/* The following is a curses emulation package suitable for the rogue program
 * in which it is included.  No other suitability is claimed or suspected.
 * Only those routines currently needed by this rogue program are included.
 * This is being provided for those systems that don't have a suitable
 * curses package and want to run this rogue program.
 *
 * Compile the entire program with -DCURSES to incorporate this package.
 *
 * The following is NOT supported:
 *   "%D", "%B", "%n", or "%>" inside a cursor motion (cm) termcap string.
 *   Terminals in which the cursor motion addresses the row differently from
 *       the column, as in ":cm=\E%2,%3" or ":cm=\EY%+x;%+y"
 *   Termcap database stored in the TERMCAP environ variable as returned
 *       from md_getenv().  Only the termcap file name can be stored there.
 *       See the comments for md_getenv() in machdep.c.
 *   Terminals without non-destructive backspace.  Backspace (^H) is used
 *       for cursor motion regardless of any termcap entries.
 *   The ":tc=" termcap entry is ignored.
 *
 * Suggestions:
 *   Use line-feed as your termcap "do" entry: ":do=^J", ":do=\012" or
 *      ":do=\n"  This will help cursor motion optimization.  If line-feed
 *      won't work, then a short escape sequence will do.
 */

#include <stdio.h>
#include "rogue.h"

boolean tc_tname();

#define BS 010
#define LF 012
#define CR 015
#define ESC '\033'
#define TAB '\011'

#define ST_MASK 0x80
#define BUFLEN 256

char terminal[DROWS][DCOLS];
char buffer[DROWS][DCOLS];
char *tc_file;

char cm_esc[16];
char cm_sep[16];
char cm_end[16];
boolean cm_reverse = 0;
boolean cm_two = 0;
boolean cm_three = 0;
boolean cm_char = 0;
short cm_inc = 0;

boolean screen_dirty;
boolean lines_dirty[DROWS];
boolean buf_stand_out = 0;
boolean term_stand_out = 0;

int LINES = DROWS;
int COLS = DCOLS;
WINDOW scr_buf;
WINDOW *curscr = &scr_buf;

char *CL = (char *) 0;
char *CM = (char *) 0;
char *UC = (char *) 0;	/* UP */
char *DO = (char *) 0;
char *VS = "";
char *VE = "";
char *TI = "";
char *TE = "";
char *SO = "";
char *SE = "";

short cur_row;
short cur_col;

initscr()
{
    clear();
    get_term_info();
    printf("%s%s", TI, VS);
}

endwin()
{
    printf("%s%s", TE, VE);
    md_cbreak_no_echo_nonl(0);
}

move(row, col)
short row, col;
{
    curscr->_cury = row;
    curscr->_curx = col;
    screen_dirty = 1;
}

mvaddstr(row, col, str)
short row, col;
char *str;
{
    move(row, col);
    addstr(str);
}

addstr(str)
char *str;
{
    while (*str) {
        addch((int) *str++);
    }
}

addch(ch)
register int ch;
{
    short row, col;

    row = curscr->_cury;
    col = curscr->_curx++;

    if (buf_stand_out) {
        ch |= ST_MASK;
    }
    buffer[row][col] = (char) ch;
    lines_dirty[row] = 1;
    screen_dirty = 1;
}

mvaddch(row, col, ch)
short row, col;
int ch;
{
    move(row, col);
    addch(ch);
}

refresh()
{
    register i, j, line;
    short old_row, old_col, first_row;

    if (screen_dirty) {

        old_row = curscr->_cury;
        old_col = curscr->_curx;
        first_row = cur_row;

        for (i = 0; i < DROWS; i++) {
            line = (first_row + i) % DROWS;
            if (lines_dirty[line]) {
                for (j = 0; j < DCOLS; j++) {
                    if (buffer[line][j] != terminal[line][j]) {
                        put_char_at(line, j, buffer[line][j]);
                    }
                }
                lines_dirty[line] = 0;
            }
        }
        put_cursor(old_row, old_col);
        screen_dirty = 0;
        fflush(stdout);
    }
}

wrefresh(scr)
WINDOW *scr;
{
    short i, col;

    printf("%s", CL);
    cur_row = cur_col = 0;

    for (i = 0; i < DROWS; i++) {
        col = 0;
        while (col < DCOLS) {
            while ((col < DCOLS) && (buffer[i][col] == ' ')) {
                col++;
            }
            if (col < DCOLS) {
                put_cursor(i, col);
            }
            while ((col < DCOLS) && (buffer[i][col] != ' ')) {
                put_st_char((int) buffer[i][col]);
                cur_col++;
                col++;
            }
        }
    }
    put_cursor(curscr->_cury, curscr->_curx);
    fflush(stdout);
    scr = scr;		/* make lint happy */
}

mvinch(row, col)
short row, col;
{
    move(row, col);
    return ((int) buffer[row][col]);
}

clear()
{
    printf("%s", CL);
    fflush(stdout);
    cur_row = cur_col = 0;
    move(0, 0);
    clear_buffers();
}

clrtoeol()
{
    short row, col;

    row = curscr->_cury;

    for (col = curscr->_curx; col < DCOLS; col++) {
        buffer[row][col] = ' ';
    }
    lines_dirty[row] = 1;
}

standout()
{
    buf_stand_out = 1;
}

standend()
{
    buf_stand_out = 0;
}

crmode()
{
    md_cbreak_no_echo_nonl(1);
}

noecho()
{
    /* crmode() takes care of this */
}

nonl()
{
    /* crmode() takes care of this */
}

clear_buffers()
{
    register i, j;

    screen_dirty = 0;

    for (i = 0; i < DROWS; i++) {
        lines_dirty[i] = 0;
        for (j = 0; j < DCOLS; j++) {
            terminal[i][j] = ' ';
            buffer[i][j] = ' ';
        }
    }
}

put_char_at(row, col, ch)
register row, col, ch;
{
    put_cursor(row, col);
    put_st_char(ch);
    terminal[row][col] = (char) ch;
    cur_col++;
}

put_cursor(row, col)
register row, col;
{
    register i, rdif, cdif;
    short ch, t;

    rdif = (row > cur_row) ? row - cur_row : cur_row - row;
    cdif = (col > cur_col) ? col - cur_col : cur_col - col;

    if (((row > cur_row) && DO) || ((cur_row > row) && UC)) {
        if ((rdif < 4) && (cdif < 4)) {
            for (i = 0; i < rdif; i++) {
                printf("%s", ((row < cur_row) ? UC : DO));
            }
            cur_row = row;
            if (col == cur_col) {
                return;
            }
        }
    }
    if (row == cur_row) {
        if (cdif <= 6) {
            for (i = 0; i < cdif; i++) {
                ch = (col < cur_col) ? BS :
                     terminal[row][cur_col + i];
                put_st_char((int) ch);
            }
            cur_row = row;
            cur_col = col;
            return;
        }
    }
    cur_row = row;
    cur_col = col;

    row += cm_inc;
    col += cm_inc;

    if (cm_reverse) {
        t = row;
        row = col;
        col = t;
    }
    if (cm_two) {
        printf("%s%02d%s%02d%s", cm_esc, row, cm_sep, col, cm_end);
    } else if (cm_three) {
        printf("%s%03d%s%03d%s", cm_esc, row, cm_sep, col, cm_end);
    } else if (cm_char) {
        printf("%s%c%s%c%s", cm_esc, row, cm_sep, col, cm_end);
    } else {
        printf("%s%d%s%d%s", cm_esc, row, cm_sep, col, cm_end);
    }
}

put_st_char(ch)
register ch;
{
    if ((ch & ST_MASK) && (!term_stand_out)) {
        ch &= ~ST_MASK;
        printf("%s%c", SO, ch);
        term_stand_out = 1;
    } else if ((!(ch & ST_MASK)) && term_stand_out) {
        printf("%s%c", SE, ch);
        term_stand_out = 0;
    } else {
        ch &= ~ST_MASK;
        putchar(ch);
    }
}

get_term_info()
{
    FILE *fp;
    char *term, *tcf;
    char buf[BUFLEN];

    if (tcf = md_getenv("TERMCAP")) {
        if (strlen(tcf) > 40) {
            clean_up("TERMCAP file name too long");
        }
        tc_file = tcf;
    } else {
        if (!(tc_file = md_gdtcf())) {
            clean_up("I need a termcap file");
        }
    }

    if (!(term = md_getenv("TERM"))) {
        clean_up("Cannot find TERM variable in environ");
    }
    if ((fp = fopen(tc_file, "r")) == NULL) {
        sprintf(buf, "Cannot open TERMCAP file: %s", tc_file);
        clean_up(buf);
    }

    if (!tc_tname(fp, term, buf)) {
        sprintf(buf, "Cannot find TERM type: %s in TERMCAP file: %s", term,
                tc_file);
        clean_up(buf);
    }
    tc_gtdata(fp, buf);
    fclose(fp);
}

boolean
tc_tname(fp, term, buf)
FILE *fp;
char *term;
char *buf;
{
    short i, j;
    boolean found = 0;
    char *fg;

    while (!found) {
        i = 0;
        fg = fgets(buf, BUFLEN, fp);
        if (fg != NULL) {
            if ((buf[0] != '#') && (buf[0] != ' ') && (buf[0] != TAB) &&
                    (buf[0] != CR) && (buf[0] != LF)) {
                while (buf[i] && (!found)) {
                    j = 0;
                    while (buf[i] == term[j]) {
                        i++;
                        j++;
                    }
                    if ((!term[j]) && ((buf[i] == '|') || (buf[i] == ':'))) {
                        found = 1;
                    } else {
                        while (buf[i] && (buf[i] != '|') && (buf[i] != ':')) {
                            i++;
                        }
                        if (buf[i]) {
                            i++;
                        }
                    }
                }
            }
        } else {
            break;
        }
    }
    return (found);
}

tc_gtdata(fp, buf)
FILE *fp;
char *buf;
{
    short i;
    boolean first = 1;

    do {
        if (!first) {
            if ((buf[0] != TAB) && (buf[0] != ' ')) {
                break;
            }
        }
        first = 0;
        i = 0;
        while (buf[i]) {
            while (buf[i] && (buf[i] != ':')) {
                i++;
            }
            if (buf[i] == ':') {
                if (!strncmp(buf + i, ":cl=", 4)) {
                    tc_gets(buf + i, &CL);
                } else if (!strncmp(buf + i, ":cm=", 4)) {
                    tc_gets(buf + i, &CM);
                } else if (!strncmp(buf + i, ":up=", 4)) {
                    tc_gets(buf + i, &UC);
                } else if (!strncmp(buf + i, ":do=", 4)) {
                    tc_gets(buf + i, &DO);
                } else if (!strncmp(buf + i, ":vs=", 4)) {
                    tc_gets(buf + i, &VS);
                } else if (!strncmp(buf + i, ":ve=", 4)) {
                    tc_gets(buf + i, &VE);
                } else if (!strncmp(buf + i, ":ti=", 4)) {
                    tc_gets(buf + i, &TI);
                } else if (!strncmp(buf + i, ":te=", 4)) {
                    tc_gets(buf + i, &TE);
                } else if (!strncmp(buf + i, ":vs=", 4)) {
                    tc_gets(buf + i, &VS);
                } else if (!strncmp(buf + i, ":ve=", 4)) {
                    tc_gets(buf + i, &VE);
                } else if (!strncmp(buf + i, ":so=", 4)) {
                    tc_gets(buf + i, &SO);
                } else if (!strncmp(buf + i, ":se=", 4)) {
                    tc_gets(buf + i, &SE);
                } else if (!strncmp(buf + i, ":li#", 4)) {
                    tc_gnum(buf + i, &LINES);
                } else if (!strncmp(buf + i, ":co#", 4)) {
                    tc_gnum(buf + i, &COLS);
                }
                i++;
            }
        }
    } while (fgets(buf, BUFLEN, fp) != NULL);

    if ((!CM) || (!CL)) {
        clean_up("Terminal and termcap must have cm and cl");
    }
    tc_cmget();
}

tc_gets(ibuf, tcstr)
char *ibuf;
char **tcstr;
{
    short i, j, k, n;
    char obuf[BUFLEN];

    i = 4;
    j = 0;

    while (ibuf[i] && is_digit(ibuf[i])) {
        i++;
    }

    while (ibuf[i] && (ibuf[i] != ':')) {
        if (ibuf[i] == '\\') {
            i++;
            switch (ibuf[i]) {
            case 'E':
                obuf[j] = ESC;
                i++;
                break;
            case 'n':
                obuf[j] = LF;
                i++;
                break;
            case 'r':
                obuf[j] = CR;
                i++;
                break;
            case 'b':
                obuf[j] = BS;
                i++;
                break;
            case 't':
                obuf[j] = TAB;
                i++;
                break;
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
                n = 0;
                k = 0;
                while (k < 3 && ibuf[i] && is_digit(ibuf[i])) {
                    n = (8 * n) + (ibuf[i] - '0');
                    i++;
                    k++;
                }
                obuf[j] = (char) n;
                break;
            default:
                obuf[j] = ibuf[i];
                i++;
            }
        } else if (ibuf[i] == '^') {
            obuf[j] = ibuf[i + 1] - 64;
            i += 2;
        } else {
            obuf[j] = ibuf[i++];
        }
        j++;
    }
    obuf[j] = 0;
    if (!(*tcstr = md_malloc(j + 1))) {
        clean_up("cannot alloc() memory");
    }
    (void) strcpy(*tcstr, obuf);
}

tc_gnum(ibuf, n)
char *ibuf;
int *n;
{
    short i;
    int r = 0;

    i = 4;

    while (is_digit(ibuf[i])) {
        r = (r * 10) + (ibuf[i] - '0');
        i++;
    }
    *n = r;
}

tstp()
{
    endwin();
    md_tstp();

    start_window();
    printf("%s%s", TI, VS);
    wrefresh(curscr);
    md_slurp();
}

tc_cmget()
{
    short i = 0, j = 0, rc_spec = 0;

    while (CM[i] && (CM[i] != '%') && (j < 15)) {
        cm_esc[j++] = CM[i++];
    }
    cm_esc[j] = 0;

    while (CM[i] && (rc_spec < 2)) {
        if (CM[i] == '%') {
            i++;
            switch (CM[i]) {
            case 'd':
                rc_spec++;
                break;
            case 'i':
                cm_inc = 1;
                break;
            case '2':
                cm_two = 1;
                rc_spec++;
                break;
            case '3':
                cm_three = 1;
                rc_spec++;
                break;
            case '.':
                cm_char = 1;
                rc_spec++;
                break;
            case 'r':
                cm_reverse = 1;
                break;
            case '+':
                i++;
                cm_inc = CM[i];
                cm_char = 1;
                rc_spec++;
                break;
            }
            i++;
        } else {
            j = 0;
            while (CM[i] && (CM[i] != '%')) {
                cm_sep[j++] = CM[i++];
            }
            cm_sep[j] = 0;
        }
    }

    j = 0;
    if (rc_spec == 2) {
        while (CM[i] && (j < 15)) {
            cm_end[j++] = CM[i++];
        }
    }
    cm_end[j] = 0;
}

#endif