X-Git-Url: http://git.madism.org/?a=blobdiff_plain;f=madtty%2Frote.c;fp=madtty%2Frote.c;h=83dd331d3343e9ad72ebf40822d0f30cfcd19e81;hb=fcbd5f6835f65055d0ac14d3a2da3afb39634fd3;hp=0000000000000000000000000000000000000000;hpb=6b8dbf88373a486ad0117331cfb577b3b6010141;p=apps%2Fmadtty.git diff --git a/madtty/rote.c b/madtty/rote.c new file mode 100644 index 0000000..83dd331 --- /dev/null +++ b/madtty/rote.c @@ -0,0 +1,261 @@ +/* + LICENSE INFORMATION: + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License (LGPL) as published by the Free Software Foundation. + + Please refer to the COPYING file for more information. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + Copyright © 2004 Bruno T. C. de Oliveira + Copyright © 2006 Pierre Habouzit + */ + +#include +#ifdef USE_PTY +#include +#endif +#include +#include + +#include "madtty.h" +#include "roteprivate.h" + +#define ROTE_VT_UPDATE_ITERATIONS 5 + +RoteTerm *rote_vt_create(int rows, int cols) { + RoteTerm *rt; + int i, j; + + if (rows <= 0 || cols <= 0) return NULL; + + if (! (rt = (RoteTerm*) malloc(sizeof(RoteTerm))) ) return NULL; + memset(rt, 0, sizeof(RoteTerm)); + + /* record dimensions */ + rt->rows = rows; + rt->cols = cols; + + /* default mode is replace */ + rt->insert = false; + + /* create the cell matrix */ + rt->cells = (RoteCell**) malloc(sizeof(RoteCell*) * rt->rows); + for (i = 0; i < rt->rows; i++) { + /* create row */ + rt->cells[i] = (RoteCell*) malloc(sizeof(RoteCell) * rt->cols); + + /* fill row with spaces */ + for (j = 0; j < rt->cols; j++) { + rt->cells[i][j].ch = 0x20; /* a space */ + rt->cells[i][j].attr = 0x70; /* white text, black background */ + } + } + + /* allocate dirtiness array */ + rt->line_dirty = (bool*) malloc(sizeof(bool) * rt->rows); + + /* initialization of other public fields */ + rt->crow = rt->ccol = 0; + rt->curattr = 0x70; /* white text over black background */ + + /* allocate private data */ + rt->pd = (RoteTermPrivate*) malloc(sizeof(RoteTermPrivate)); + memset(rt->pd, 0, sizeof(RoteTermPrivate)); + + rt->pd->pty = -1; /* no pty for now */ + + /* initial scrolling area is the whole window */ + rt->pd->scrolltop = 0; + rt->pd->scrollbottom = rt->rows - 1; + + #ifdef DEBUG + fprintf(stderr, "Created a %d x %d terminal.\n", rt->rows, rt->cols); + #endif + + return rt; +} + +void rote_vt_destroy(RoteTerm *rt) { + int i; + if (!rt) return; + + free(rt->pd); + free(rt->line_dirty); + for (i = 0; i < rt->rows; i++) free(rt->cells[i]); + free(rt->cells); + free(rt); +} + +#ifdef USE_NCURSES + +static void default_cur_set_attr(WINDOW *win, unsigned char attr) { + int cp = ROTE_ATTR_BG(attr) * 8 + 7 - ROTE_ATTR_FG(attr); + if (!cp) wattrset(win, A_NORMAL); + else wattrset(win, COLOR_PAIR(cp)); + + if (ROTE_ATTR_BOLD(attr)) wattron(win, A_BOLD); + if (ROTE_ATTR_BLINK(attr)) wattron(win, A_BLINK); +} + +#endif + +static inline unsigned char ensure_printable(unsigned char ch) + { return ch >= 32 ? ch : 32; } + +#ifdef USE_NCURSES + +void rote_vt_draw(RoteTerm *rt, WINDOW *win, int srow, int scol, + void (*cur_set_attr)(WINDOW*,unsigned char)) { + + int i, j; + rote_vt_update(rt); + + if (!cur_set_attr) cur_set_attr = default_cur_set_attr; + for (i = 0; i < rt->rows; i++) { + wmove(win, srow + i, scol); + for (j = 0; j < rt->cols; j++) { + (*cur_set_attr)(win, rt->cells[i][j].attr); + waddch(win, ensure_printable(rt->cells[i][j].ch)); + } + } + + wmove(win, srow + rt->crow, scol + rt->ccol); +} + +#endif + +#ifdef USE_PTY + +pid_t rote_vt_forkpty(RoteTerm *rt, const char *command) { + struct winsize ws; + pid_t childpid; + + ws.ws_row = rt->rows; + ws.ws_col = rt->cols; + ws.ws_xpixel = ws.ws_ypixel = 0; + + childpid = forkpty(&rt->pd->pty, NULL, NULL, &ws); + if (childpid < 0) return -1; + + if (childpid == 0) { + /* we are the child, running under the slave side of the pty. */ + + /* Cajole application into using linux-console-compatible escape + * sequences (which is what we are prepared to interpret) */ + setenv("TERM", "linux", 1); + + /* Now we will exec /bin/sh -c command. */ + execl("/bin/sh", "/bin/sh", "-c", command, NULL); + + fprintf(stderr, "\nexecl() failed.\nCommand: '%s'\n", command); + exit(127); /* error exec'ing */ + } + + /* if we got here we are the parent process */ + rt->childpid = childpid; + return childpid; +} + +void rote_vt_forsake_child(RoteTerm *rt) { + if (rt->pd->pty >= 0) close(rt->pd->pty); + rt->pd->pty = -1; + rt->childpid = 0; +} + +#endif + +void rote_vt_update(RoteTerm *rt) { + fd_set ifs; + struct timeval tvzero; + char buf[512]; + int bytesread; + int n = ROTE_VT_UPDATE_ITERATIONS; + if (rt->pd->pty < 0) return; /* nothing to pump */ + + while (n--) { /* iterate at most ROVE_VT_UPDATE_ITERATIONS times. + * As Phil Endecott pointed out, if we don't restrict this, + * a program that floods the terminal with output + * could cause this loop to iterate forever, never + * being able to catch up. So we'll rely on the client + * calling rote_vt_update often, as the documentation + * recommends :-) */ + + /* check if pty has something to say */ + FD_ZERO(&ifs); FD_SET(rt->pd->pty, &ifs); + tvzero.tv_sec = 0; tvzero.tv_usec = 0; + + if (select(rt->pd->pty + 1, &ifs, NULL, NULL, &tvzero) <= 0) + return; /* nothing to read, or select() failed */ + + /* read what we can. This is guaranteed not to block, since + * select() told us there was something to read. */ + bytesread = read(rt->pd->pty, buf, 512); + if (bytesread <= 0) return; + + /* inject the data into the terminal */ + rote_vt_inject(rt, buf, bytesread); + } +} + +void rote_vt_write(RoteTerm *rt, const char *data, int len) { + if (rt->pd->pty < 0) { + /* no pty, so just inject the data plain and simple */ + rote_vt_inject(rt, data, len); + return; + } + + /* write data to pty. Keep calling write() until we have written + * everything. */ + while (len > 0) { + int byteswritten = write(rt->pd->pty, data, len); + if (byteswritten < 0) { + /* very ugly way to inform the error. Improvements welcome! */ + static char errormsg[] = "\n(ROTE: pty write() error)\n"; + rote_vt_inject(rt, errormsg, strlen(errormsg)); + return; + } + + data += byteswritten; + len -= byteswritten; + } +} + +void rote_vt_install_handler(RoteTerm *rt, rote_es_handler_t handler) { + rt->pd->handler = handler; +} + +void *rote_vt_take_snapshot(RoteTerm *rt) { + int i; + int bytes_per_row = sizeof(RoteCell) * rt->cols; + void *buf = malloc(bytes_per_row * rt->rows); + void *ptr = buf; + + for (i = 0; i < rt->rows; i++, ptr += bytes_per_row) + memcpy(ptr, rt->cells[i], bytes_per_row); + + return buf; +} + +void rote_vt_restore_snapshot(RoteTerm *rt, void *snapbuf) { + int i; + int bytes_per_row = sizeof(RoteCell) * rt->cols; + + for (i = 0; i < rt->rows; i++, snapbuf += bytes_per_row) { + rt->line_dirty[i] = true; + memcpy(rt->cells[i], snapbuf, bytes_per_row); + } +} + +int rote_vt_get_pty_fd(RoteTerm *rt) { + return rt->pd->pty; +} +