3 This program is free software; you can redistribute it and/or
4 modify it under the terms of the GNU Lesser General Public
5 License (LGPL) as published by the Free Software Foundation.
7 Please refer to the COPYING file for more information.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 Copyright (c) 2004 Bruno T. C. de Oliveira
23 #include "roteprivate.h"
29 #define ROTE_VT_UPDATE_ITERATIONS 5
31 RoteTerm *rote_vt_create(int rows, int cols) {
35 if (rows <= 0 || cols <= 0) return NULL;
37 if (! (rt = (RoteTerm*) malloc(sizeof(RoteTerm))) ) return NULL;
38 memset(rt, 0, sizeof(RoteTerm));
40 /* record dimensions */
44 /* create the cell matrix */
45 rt->cells = (RoteCell**) malloc(sizeof(RoteCell*) * rt->rows);
46 for (i = 0; i < rt->rows; i++) {
48 rt->cells[i] = (RoteCell*) malloc(sizeof(RoteCell) * rt->cols);
50 /* fill row with spaces */
51 for (j = 0; j < rt->cols; j++) {
52 rt->cells[i][j].ch = 0x20; /* a space */
53 rt->cells[i][j].attr = 0x70; /* white text, black background */
57 /* allocate dirtiness array */
58 rt->line_dirty = (bool*) malloc(sizeof(bool) * rt->rows);
60 /* initialization of other public fields */
61 rt->crow = rt->ccol = 0;
62 rt->curattr = 0x70; /* white text over black background */
64 /* allocate private data */
65 rt->pd = (RoteTermPrivate*) malloc(sizeof(RoteTermPrivate));
66 memset(rt->pd, 0, sizeof(RoteTermPrivate));
68 rt->pd->pty = -1; /* no pty for now */
70 /* initial scrolling area is the whole window */
71 rt->pd->scrolltop = 0;
72 rt->pd->scrollbottom = rt->rows - 1;
75 fprintf(stderr, "Created a %d x %d terminal.\n", rt->rows, rt->cols);
81 void rote_vt_destroy(RoteTerm *rt) {
87 for (i = 0; i < rt->rows; i++) free(rt->cells[i]);
92 static void default_cur_set_attr(WINDOW *win, unsigned char attr) {
93 int cp = ROTE_ATTR_BG(attr) * 8 + 7 - ROTE_ATTR_FG(attr);
94 if (!cp) wattrset(win, A_NORMAL);
95 else wattrset(win, COLOR_PAIR(cp));
97 if (ROTE_ATTR_BOLD(attr)) wattron(win, A_BOLD);
98 if (ROTE_ATTR_BLINK(attr)) wattron(win, A_BLINK);
101 static inline unsigned char ensure_printable(unsigned char ch)
102 { return ch >= 32 ? ch : 32; }
104 void rote_vt_draw(RoteTerm *rt, WINDOW *win, int srow, int scol,
105 void (*cur_set_attr)(WINDOW*,unsigned char)) {
110 if (!cur_set_attr) cur_set_attr = default_cur_set_attr;
111 for (i = 0; i < rt->rows; i++) {
112 wmove(win, srow + i, scol);
113 for (j = 0; j < rt->cols; j++) {
114 (*cur_set_attr)(win, rt->cells[i][j].attr);
115 waddch(win, ensure_printable(rt->cells[i][j].ch));
119 wmove(win, srow + rt->crow, scol + rt->ccol);
122 pid_t rote_vt_forkpty(RoteTerm *rt, const char *command) {
126 ws.ws_row = rt->rows;
127 ws.ws_col = rt->cols;
128 ws.ws_xpixel = ws.ws_ypixel = 0;
130 childpid = forkpty(&rt->pd->pty, NULL, NULL, &ws);
131 if (childpid < 0) return -1;
134 /* we are the child, running under the slave side of the pty. */
136 /* Cajole application into using linux-console-compatible escape
137 * sequences (which is what we are prepared to interpret) */
138 setenv("TERM", "linux", 1);
140 /* Now we will exec /bin/sh -c command. */
141 execl("/bin/sh", "/bin/sh", "-c", command, NULL);
143 fprintf(stderr, "\nexecl() failed.\nCommand: '%s'\n", command);
144 exit(127); /* error exec'ing */
147 /* if we got here we are the parent process */
148 rt->childpid = childpid;
152 void rote_vt_forsake_child(RoteTerm *rt) {
153 if (rt->pd->pty >= 0) close(rt->pd->pty);
158 void rote_vt_update(RoteTerm *rt) {
160 struct timeval tvzero;
163 int n = ROTE_VT_UPDATE_ITERATIONS;
164 if (rt->pd->pty < 0) return; /* nothing to pump */
166 while (n--) { /* iterate at most ROVE_VT_UPDATE_ITERATIONS times.
167 * As Phil Endecott pointed out, if we don't restrict this,
168 * a program that floods the terminal with output
169 * could cause this loop to iterate forever, never
170 * being able to catch up. So we'll rely on the client
171 * calling rote_vt_update often, as the documentation
174 /* check if pty has something to say */
175 FD_ZERO(&ifs); FD_SET(rt->pd->pty, &ifs);
176 tvzero.tv_sec = 0; tvzero.tv_usec = 0;
178 if (select(rt->pd->pty + 1, &ifs, NULL, NULL, &tvzero) <= 0)
179 return; /* nothing to read, or select() failed */
181 /* read what we can. This is guaranteed not to block, since
182 * select() told us there was something to read. */
183 bytesread = read(rt->pd->pty, buf, 512);
184 if (bytesread <= 0) return;
186 /* inject the data into the terminal */
187 rote_vt_inject(rt, buf, bytesread);
191 void rote_vt_write(RoteTerm *rt, const char *data, int len) {
192 if (rt->pd->pty < 0) {
193 /* no pty, so just inject the data plain and simple */
194 rote_vt_inject(rt, data, len);
198 /* write data to pty. Keep calling write() until we have written
201 int byteswritten = write(rt->pd->pty, data, len);
202 if (byteswritten < 0) {
203 /* very ugly way to inform the error. Improvements welcome! */
204 static char errormsg[] = "\n(ROTE: pty write() error)\n";
205 rote_vt_inject(rt, errormsg, strlen(errormsg));
209 data += byteswritten;
214 void rote_vt_install_handler(RoteTerm *rt, rote_es_handler_t handler) {
215 rt->pd->handler = handler;
218 void *rote_vt_take_snapshot(RoteTerm *rt) {
220 int bytes_per_row = sizeof(RoteCell) * rt->cols;
221 void *buf = malloc(bytes_per_row * rt->rows);
224 for (i = 0; i < rt->rows; i++, ptr += bytes_per_row)
225 memcpy(ptr, rt->cells[i], bytes_per_row);
230 void rote_vt_restore_snapshot(RoteTerm *rt, void *snapbuf) {
232 int bytes_per_row = sizeof(RoteCell) * rt->cols;
234 for (i = 0; i < rt->rows; i++, snapbuf += bytes_per_row) {
235 rt->line_dirty[i] = true;
236 memcpy(rt->cells[i], snapbuf, bytes_per_row);
240 int rote_vt_get_pty_fd(RoteTerm *rt) {