3 * Copyright (C) 1984-2007 Mark Nudelman
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Less License, as specified in the README file.
8 * For more information about less, or for information on how to
9 * contact the author, see the README file.
14 * Routines which deal with the characteristics of the terminal.
15 * Uses termcap to be as terminal-independent as possible.
23 #if MSDOS_COMPILER==MSOFTC
26 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
28 #if MSDOS_COMPILER==DJGPPC
33 #if MSDOS_COMPILER==WIN32C
43 #include <sys/ioctl.h>
46 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
67 #include <sys/signal.h>
71 #include <sys/stream.h>
77 #endif /* MSDOS_COMPILER */
80 * Check for broken termios package that forces you to manually
81 * set the line discipline.
84 #define MUST_SET_LINE_DISCIPLINE 1
86 #define MUST_SET_LINE_DISCIPLINE 0
90 #define DEFAULT_TERM "ansi"
91 static char *windowid;
93 #define DEFAULT_TERM "unknown"
96 #if MSDOS_COMPILER==MSOFTC
97 static int videopages;
98 static long msec_loops;
99 static int flash_created = 0;
100 #define SETCOLORS(fg,bg) { _settextcolor(fg); _setbkcolor(bg); }
103 #if MSDOS_COMPILER==BORLANDC
104 static unsigned short *whitescreen;
105 static int flash_created = 0;
107 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
108 #define _settextposition(y,x) gotoxy(x,y)
109 #define _clearscreen(m) clrscr()
110 #define _outtext(s) cputs(s)
111 #define SETCOLORS(fg,bg) { textcolor(fg); textbackground(bg); }
112 extern int sc_height;
115 #if MSDOS_COMPILER==WIN32C
122 static int keyCount = 0;
123 static WORD curr_attr;
124 static int pending_scancode = 0;
125 static WORD *whitescreen;
127 static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
128 static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
129 HANDLE con_out = INVALID_HANDLE_VALUE; /* current console */
132 static void win32_init_term();
133 static void win32_deinit_term();
135 #define FG_COLORS (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
136 #define BG_COLORS (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
137 #define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4)))
138 #define SETCOLORS(fg,bg) { curr_attr = MAKEATTR(fg,bg); \
139 if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
140 error("SETCOLORS failed"); }
144 public int nm_fg_color; /* Color of normal text */
145 public int nm_bg_color;
146 public int bo_fg_color; /* Color of bold text */
147 public int bo_bg_color;
148 public int ul_fg_color; /* Color of underlined text */
149 public int ul_bg_color;
150 public int so_fg_color; /* Color of standout text */
151 public int so_bg_color;
152 public int bl_fg_color; /* Color of blinking text */
153 public int bl_bg_color;
154 static int sy_fg_color; /* Color of system text (before less) */
155 static int sy_bg_color;
160 * Strings passed to tputs() to do various terminal functions.
163 *sc_pad, /* Pad string */
164 *sc_home, /* Cursor home */
165 *sc_addline, /* Add line, scroll down following lines */
166 *sc_lower_left, /* Cursor to last line, first column */
167 *sc_return, /* Cursor to beginning of current line */
168 *sc_move, /* General cursor positioning */
169 *sc_clear, /* Clear screen */
170 *sc_eol_clear, /* Clear to end of line */
171 *sc_eos_clear, /* Clear to end of screen */
172 *sc_s_in, /* Enter standout (highlighted) mode */
173 *sc_s_out, /* Exit standout mode */
174 *sc_u_in, /* Enter underline mode */
175 *sc_u_out, /* Exit underline mode */
176 *sc_b_in, /* Enter bold mode */
177 *sc_b_out, /* Exit bold mode */
178 *sc_bl_in, /* Enter blink mode */
179 *sc_bl_out, /* Exit blink mode */
180 *sc_visual_bell, /* Visual bell (flash screen) sequence */
181 *sc_backspace, /* Backspace cursor */
182 *sc_s_keypad, /* Start keypad mode */
183 *sc_e_keypad, /* End keypad mode */
184 *sc_init, /* Startup terminal initialization */
185 *sc_deinit; /* Exit terminal de-initialization */
188 static int init_done = 0;
190 public int auto_wrap; /* Terminal does \r\n when write past margin */
191 public int ignaw; /* Terminal ignores \n immediately after wrap */
192 public int erase_char; /* The user's erase char */
193 public int erase2_char; /* The user's other erase char */
194 public int kill_char; /* The user's line-kill char */
195 public int werase_char; /* The user's word-erase char */
196 public int sc_width, sc_height; /* Height & width of screen */
197 public int bo_s_width, bo_e_width; /* Printing width of boldface seq */
198 public int ul_s_width, ul_e_width; /* Printing width of underline seq */
199 public int so_s_width, so_e_width; /* Printing width of standout seq */
200 public int bl_s_width, bl_e_width; /* Printing width of blink seq */
201 public int above_mem, below_mem; /* Memory retained above/below screen */
202 public int can_goto_line; /* Can move cursor to any line */
203 public int clear_bg; /* Clear fills with background color */
204 public int missing_cap = 0; /* Some capability is missing */
206 static int attrmode = AT_NORMAL;
210 static char *cheaper();
211 static void tmodes();
215 * These two variables are sometimes defined in,
216 * and needed by, the termcap library.
218 #if MUST_DEFINE_OSPEED
219 extern short ospeed; /* Terminal output baud rate */
220 extern char PC; /* Pad character */
227 extern int quiet; /* If VERY_QUIET, use visual bell for bell */
228 extern int no_back_scroll;
231 extern int quit_at_eof;
232 extern int less_is_more;
233 extern int no_keypad;
236 extern int screen_trashed;
238 extern int top_scroll;
241 extern int hilite_search;
244 extern char *tgetstr();
245 extern char *tgoto();
249 * Change terminal to "raw mode", or restore to "normal" mode.
251 * 1. An outstanding read will complete on receipt of a single keystroke.
252 * 2. Input is not echoed.
253 * 3. On output, \n is mapped to \r\n.
254 * 4. \t is NOT expanded into spaces.
255 * 5. Signal-causing characters such as ctrl-C (interrupt),
256 * etc. are NOT disabled.
257 * It doesn't matter whether an input \n is mapped to \r, or vice versa.
263 static int curr_on = 0;
267 erase2_char = '\b'; /* in case OS doesn't know about erase2 */
268 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
271 static struct termios save_term;
272 static int saved_term = 0;
277 * Get terminal modes.
282 * Save modes and set certain variables dependent on modes.
290 switch (cfgetospeed(&s))
293 case B0: ospeed = 0; break;
296 case B50: ospeed = 1; break;
299 case B75: ospeed = 2; break;
302 case B110: ospeed = 3; break;
305 case B134: ospeed = 4; break;
308 case B150: ospeed = 5; break;
311 case B200: ospeed = 6; break;
314 case B300: ospeed = 7; break;
317 case B600: ospeed = 8; break;
320 case B1200: ospeed = 9; break;
323 case B1800: ospeed = 10; break;
326 case B2400: ospeed = 11; break;
329 case B4800: ospeed = 12; break;
332 case B9600: ospeed = 13; break;
335 case EXTA: ospeed = 14; break;
338 case EXTB: ospeed = 15; break;
341 case B57600: ospeed = 16; break;
344 case B115200: ospeed = 17; break;
349 erase_char = s.c_cc[VERASE];
351 erase2_char = s.c_cc[VERASE2];
353 kill_char = s.c_cc[VKILL];
355 werase_char = s.c_cc[VWERASE];
357 werase_char = CONTROL('W');
361 * Set the modes to the way we want them.
423 #if MUST_SET_LINE_DISCIPLINE
425 * System's termios is broken; need to explicitly
426 * request TERMIODISC line discipline.
428 s.c_line = TERMIODISC;
433 * Restore saved modes.
440 tcsetattr(tty, TCSADRAIN, &s);
441 #if MUST_SET_LINE_DISCIPLINE
445 * Broken termios *ignores* any line discipline
446 * except TERMIODISC. A different old line discipline
447 * is therefore not restored, yet. Restore the old
448 * line discipline by hand.
450 ioctl(tty, TIOCSETD, &save_term.c_line);
458 static struct termio save_term;
459 static int saved_term = 0;
464 * Get terminal modes.
466 ioctl(tty, TCGETA, &s);
469 * Save modes and set certain variables dependent on modes.
477 ospeed = s.c_cflag & CBAUD;
479 erase_char = s.c_cc[VERASE];
480 kill_char = s.c_cc[VKILL];
482 werase_char = s.c_cc[VWERASE];
484 werase_char = CONTROL('W');
488 * Set the modes to the way we want them.
490 s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL);
491 s.c_oflag |= (OPOST|ONLCR|TAB3);
492 s.c_oflag &= ~(OCRNL|ONOCR|ONLRET);
498 * Restore saved modes.
502 ioctl(tty, TCSETAW, &s);
508 static struct sgttyb save_term;
509 static int saved_term = 0;
514 * Get terminal modes.
516 ioctl(tty, TIOCGETP, &s);
519 * Save modes and set certain variables dependent on modes.
527 ospeed = s.sg_ospeed;
529 erase_char = s.sg_erase;
530 kill_char = s.sg_kill;
531 werase_char = CONTROL('W');
534 * Set the modes to the way we want them.
536 s.sg_flags |= CBREAK;
537 s.sg_flags &= ~(ECHO|XTABS);
541 * Restore saved modes.
545 ioctl(tty, TIOCSETN, &s);
551 static struct sgbuf save_term;
552 static int saved_term = 0;
557 * Get terminal modes.
562 * Save modes and set certain variables dependent on modes.
569 erase_char = s.sg_bspch;
570 kill_char = s.sg_dlnch;
571 werase_char = CONTROL('W');
574 * Set the modes to the way we want them.
583 * Restore saved modes.
590 /* MS-DOS, Windows, or OS2 */
593 LSIGNAL(SIGINT, SIG_IGN);
596 #if MSDOS_COMPILER==DJGPPC
597 kill_char = CONTROL('U');
599 * So that when we shell out or run another program, its
600 * stdin is in cooked mode. We do not switch stdin to binary
601 * mode if fd0 is zero, since that means we were called before
602 * tty was reopened in open_getchr, in which case we would be
603 * changing the original stdin device outside less.
606 setmode(0, on ? O_BINARY : O_TEXT);
610 werase_char = CONTROL('W');
620 * Some glue to prevent calling termcap functions if tgetent() failed.
630 strcpy(name, "LESS_TERMCAP_");
631 strcat(name, capname);
632 return (lgetenv(name));
641 if ((s = ltget_env(capname)) != NULL)
642 return (*s != '\0' && *s != '0');
645 return (tgetflag(capname));
654 if ((s = ltget_env(capname)) != NULL)
658 return (tgetnum(capname));
662 ltgetstr(capname, pp)
668 if ((s = ltget_env(capname)) != NULL)
672 return (tgetstr(capname, pp));
674 #endif /* MSDOS_COMPILER */
677 * Get size of the output screen.
689 #define DEF_SC_WIDTH 80
691 #define DEF_SC_HEIGHT 25
693 #define DEF_SC_HEIGHT 24
697 sys_width = sys_height = 0;
699 #if MSDOS_COMPILER==MSOFTC
701 struct videoconfig w;
703 sys_height = w.numtextrows;
704 sys_width = w.numtextcols;
707 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
711 sys_height = w.screenheight;
712 sys_width = w.screenwidth;
715 #if MSDOS_COMPILER==WIN32C
717 CONSOLE_SCREEN_BUFFER_INFO scr;
718 GetConsoleScreenBufferInfo(con_out, &scr);
719 sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
720 sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
730 * When using terminal emulators for XFree86/OS2, the
731 * _scrsize function does not work well.
732 * Call the scrsize.exe program to get the window size.
734 windowid = getenv("WINDOWID");
735 if (windowid != NULL)
737 FILE *fd = popen("scrsize", "rt");
741 fscanf(fd, "%i %i", &w, &h);
755 if (ioctl(2, TIOCGWINSZ, &w) == 0)
758 sys_height = w.ws_row;
760 sys_width = w.ws_col;
767 if (ioctl(2, WIOCGETD, &w) == 0)
770 sys_height = w.uw_height / w.uw_vs;
772 sys_width = w.uw_width / w.uw_hs;
783 sc_height = sys_height;
784 else if ((s = lgetenv("LINES")) != NULL)
787 else if ((n = ltgetnum("li")) > 0)
791 sc_height = DEF_SC_HEIGHT;
794 sc_width = sys_width;
795 else if ((s = lgetenv("COLUMNS")) != NULL)
798 else if ((n = ltgetnum("co")) > 0)
802 sc_width = DEF_SC_WIDTH;
805 #if MSDOS_COMPILER==MSOFTC
807 * Figure out how many empty loops it takes to delay a millisecond.
815 * Get synchronized at the start of a tick.
818 while (clock() == start)
821 * Now count loops till the next tick.
825 while (clock() == start)
828 * Convert from (loops per clock) to (loops per millisecond).
830 msec_loops *= CLOCKS_PER_SEC;
835 * Delay for a specified number of milliseconds.
840 static long delay_dummy = 0;
852 for (i = 0; i < msec_loops; i++)
855 * Make it look like we're doing something here,
856 * so the optimizer doesn't remove the whole loop.
865 * Return the characters actually input by a "special" key.
871 static char tbuf[40];
873 #if MSDOS_COMPILER || OS2
874 static char k_right[] = { '\340', PCK_RIGHT, 0 };
875 static char k_left[] = { '\340', PCK_LEFT, 0 };
876 static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 };
877 static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 };
878 static char k_insert[] = { '\340', PCK_INSERT, 0 };
879 static char k_delete[] = { '\340', PCK_DELETE, 0 };
880 static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 };
881 static char k_ctl_backspace[] = { '\177', 0 };
882 static char k_home[] = { '\340', PCK_HOME, 0 };
883 static char k_end[] = { '\340', PCK_END, 0 };
884 static char k_up[] = { '\340', PCK_UP, 0 };
885 static char k_down[] = { '\340', PCK_DOWN, 0 };
886 static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 };
887 static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 };
888 static char k_pageup[] = { '\340', PCK_PAGEUP, 0 };
889 static char k_f1[] = { '\340', PCK_F1, 0 };
899 * If windowid is not NULL, assume less is executed in
900 * the XFree86 environment.
903 s = windowid ? ltgetstr("kr", &sp) : k_right;
906 s = windowid ? ltgetstr("kl", &sp) : k_left;
909 s = windowid ? ltgetstr("ku", &sp) : k_up;
912 s = windowid ? ltgetstr("kd", &sp) : k_down;
915 s = windowid ? ltgetstr("kP", &sp) : k_pageup;
918 s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
921 s = windowid ? ltgetstr("kh", &sp) : k_home;
924 s = windowid ? ltgetstr("@7", &sp) : k_end;
929 s = ltgetstr("kD", &sp);
969 #if MSDOS_COMPILER || OS2
973 case SK_CTL_LEFT_ARROW:
976 case SK_CTL_RIGHT_ARROW:
979 case SK_CTL_BACKSPACE:
993 s = ltgetstr("kr", &sp);
996 s = ltgetstr("kl", &sp);
999 s = ltgetstr("ku", &sp);
1002 s = ltgetstr("kd", &sp);
1005 s = ltgetstr("kP", &sp);
1008 s = ltgetstr("kN", &sp);
1011 s = ltgetstr("kh", &sp);
1014 s = ltgetstr("@7", &sp);
1017 s = ltgetstr("kD", &sp);
1027 tbuf[0] = CONTROL('K');
1038 * Get terminal capabilities via termcap.
1049 * Set up default colors.
1050 * The xx_s_width and xx_e_width vars are already initialized to 0.
1052 #if MSDOS_COMPILER==MSOFTC
1053 sy_bg_color = _getbkcolor();
1054 sy_fg_color = _gettextcolor();
1057 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1061 sy_bg_color = (w.attribute >> 4) & 0x0F;
1062 sy_fg_color = (w.attribute >> 0) & 0x0F;
1065 #if MSDOS_COMPILER==WIN32C
1068 CONSOLE_SCREEN_BUFFER_INFO scr;
1070 con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
1072 * Always open stdin in binary. Note this *must* be done
1073 * before any file operations have been done on fd0.
1076 GetConsoleScreenBufferInfo(con_out, &scr);
1077 ReadConsoleOutputAttribute(con_out, &curr_attr,
1078 1, scr.dwCursorPosition, &nread);
1079 sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
1080 sy_fg_color = curr_attr & FG_COLORS;
1085 nm_fg_color = sy_fg_color;
1086 nm_bg_color = sy_bg_color;
1097 * Get size of the screen.
1103 #else /* !MSDOS_COMPILER */
1106 register char *t1, *t2;
1108 char termbuf[TERMBUF_SIZE];
1110 static char sbuf[TERMSBUF_SIZE];
1114 * Make sure the termcap database is available.
1116 sp = lgetenv("TERMCAP");
1117 if (sp == NULL || *sp == '\0')
1120 if ((sp = homefile("termcap.dat")) != NULL)
1122 termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
1123 sprintf(termcap, "TERMCAP=%s", sp);
1130 * Find out what kind of terminal this is.
1132 if ((term = lgetenv("TERM")) == NULL)
1133 term = DEFAULT_TERM;
1135 if (tgetent(termbuf, term) != TGETENT_OK)
1137 if (ltgetflag("hc"))
1141 * Get size of the screen.
1146 auto_wrap = ltgetflag("am");
1147 ignaw = ltgetflag("xn");
1148 above_mem = ltgetflag("da");
1149 below_mem = ltgetflag("db");
1150 clear_bg = ltgetflag("ut");
1153 * Assumes termcap variable "sg" is the printing width of:
1154 * the standout sequence, the end standout sequence,
1155 * the underline sequence, the end underline sequence,
1156 * the boldface sequence, and the end boldface sequence.
1158 if ((so_s_width = ltgetnum("sg")) < 0)
1160 so_e_width = so_s_width;
1162 bo_s_width = bo_e_width = so_s_width;
1163 ul_s_width = ul_e_width = so_s_width;
1164 bl_s_width = bl_e_width = so_s_width;
1167 if (so_s_width > 0 || so_e_width > 0)
1169 * Disable highlighting by default on magic cookie terminals.
1170 * Turning on highlighting might change the displayed width
1171 * of a line, causing the display to get messed up.
1172 * The user can turn it back on with -g,
1173 * but she won't like the results.
1179 * Get various string-valued capabilities.
1184 sc_pad = ltgetstr("pc", &sp);
1189 sc_s_keypad = ltgetstr("ks", &sp);
1190 if (sc_s_keypad == NULL)
1192 sc_e_keypad = ltgetstr("ke", &sp);
1193 if (sc_e_keypad == NULL)
1197 * This loses for terminals with termcap entries with ti/te strings
1198 * that switch to/from an alternate screen, and we're in quit_at_eof
1201 if (!quit_at_eof && !less_is_more) {
1202 sc_init = ltgetstr("ti", &sp);
1203 sc_deinit = ltgetstr("te", &sp);
1206 if (sc_init == NULL)
1209 if (sc_deinit == NULL)
1212 sc_eol_clear = ltgetstr("ce", &sp);
1213 if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
1219 sc_eos_clear = ltgetstr("cd", &sp);
1220 if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
1226 sc_clear = ltgetstr("cl", &sp);
1227 if (sc_clear == NULL || *sc_clear == '\0')
1233 sc_move = ltgetstr("cm", &sp);
1234 if (sc_move == NULL || *sc_move == '\0')
1237 * This is not an error here, because we don't
1238 * always need sc_move.
1239 * We need it only if we don't have home or lower-left.
1246 tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
1247 tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
1248 tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
1249 tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);
1251 sc_visual_bell = ltgetstr("vb", &sp);
1252 if (sc_visual_bell == NULL)
1253 sc_visual_bell = "";
1255 if (ltgetflag("bs"))
1256 sc_backspace = "\b";
1259 sc_backspace = ltgetstr("bc", &sp);
1260 if (sc_backspace == NULL || *sc_backspace == '\0')
1261 sc_backspace = "\b";
1265 * Choose between using "ho" and "cm" ("home" and "cursor move")
1266 * to move the cursor to the upper left corner of the screen.
1268 t1 = ltgetstr("ho", &sp);
1271 if (*sc_move == '\0')
1275 strcpy(sp, tgoto(sc_move, 0, 0));
1277 sp += strlen(sp) + 1;
1279 sc_home = cheaper(t1, t2, "|\b^");
1282 * Choose between using "ll" and "cm" ("lower left" and "cursor move")
1283 * to move the cursor to the lower left corner of the screen.
1285 t1 = ltgetstr("ll", &sp);
1288 if (*sc_move == '\0')
1292 strcpy(sp, tgoto(sc_move, 0, sc_height-1));
1294 sp += strlen(sp) + 1;
1296 sc_lower_left = cheaper(t1, t2, "\r");
1299 * Get carriage return string.
1301 sc_return = ltgetstr("cr", &sp);
1302 if (sc_return == NULL)
1306 * Choose between using "al" or "sr" ("add line" or "scroll reverse")
1307 * to add a line at the top of the screen.
1309 t1 = ltgetstr("al", &sp);
1312 t2 = ltgetstr("sr", &sp);
1316 if (*t1 == '\0' && *t2 == '\0')
1323 sc_addline = cheaper(t1, t2, "");
1324 if (*sc_addline == '\0')
1327 * Force repaint on any backward movement.
1331 #endif /* MSDOS_COMPILER */
1336 * Return the cost of displaying a termcap string.
1337 * We use the trick of calling tputs, but as a char printing function
1338 * we give it inc_costcount, which just increments "costcount".
1339 * This tells us how many chars would be printed by using this string.
1340 * {{ Couldn't we just use strlen? }}
1342 static int costcount;
1358 tputs(t, sc_height, inc_costcount);
1363 * Return the "best" of the two given termcap strings.
1364 * The best, if both exist, is the one with the lower
1365 * cost (see cost() function).
1368 cheaper(t1, t2, def)
1372 if (*t1 == '\0' && *t2 == '\0')
1381 if (cost(t1) < cost(t2))
1387 tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
1396 *instr = ltgetstr(incap, spp);
1401 *outstr = def_outstr;
1405 *outstr = ltgetstr(outcap, spp);
1406 if (*outstr == NULL)
1407 /* No specific out capability; use "me". */
1408 *outstr = ltgetstr("me", spp);
1409 if (*outstr == NULL)
1410 /* Don't even have "me"; use a null string. */
1414 #endif /* MSDOS_COMPILER */
1418 * Below are the functions which perform all the
1419 * terminal-specific screen manipulation.
1425 #if MSDOS_COMPILER==WIN32C
1427 _settextposition(int row, int col)
1430 CONSOLE_SCREEN_BUFFER_INFO csbi;
1432 GetConsoleScreenBufferInfo(con_out, &csbi);
1433 cpos.X = csbi.srWindow.Left + (col - 1);
1434 cpos.Y = csbi.srWindow.Top + (row - 1);
1435 SetConsoleCursorPosition(con_out, cpos);
1440 * Initialize the screen to the correct color at startup.
1445 SETCOLORS(nm_fg_color, nm_bg_color);
1448 * This clears the screen at startup. This is different from
1449 * the behavior of other versions of less. Disable it for now.
1456 * Create a complete, blank screen using "normal" colors.
1458 SETCOLORS(nm_fg_color, nm_bg_color);
1459 blanks = (char *) ecalloc(width+1, sizeof(char));
1460 for (col = 0; col < sc_width; col++)
1462 blanks[sc_width] = '\0';
1463 for (row = 0; row < sc_height; row++)
1470 #if MSDOS_COMPILER==WIN32C
1473 * Termcap-like init with a private win32 console.
1478 CONSOLE_SCREEN_BUFFER_INFO scr;
1481 if (con_out_save == INVALID_HANDLE_VALUE)
1484 GetConsoleScreenBufferInfo(con_out_save, &scr);
1486 if (con_out_ours == INVALID_HANDLE_VALUE)
1489 * Create our own screen buffer, so that we
1490 * may restore the original when done.
1492 con_out_ours = CreateConsoleScreenBuffer(
1493 GENERIC_WRITE | GENERIC_READ,
1494 FILE_SHARE_WRITE | FILE_SHARE_READ,
1495 (LPSECURITY_ATTRIBUTES) NULL,
1496 CONSOLE_TEXTMODE_BUFFER,
1500 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1501 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1502 SetConsoleScreenBufferSize(con_out_ours, size);
1503 SetConsoleActiveScreenBuffer(con_out_ours);
1504 con_out = con_out_ours;
1508 * Restore the startup console.
1513 if (con_out_save == INVALID_HANDLE_VALUE)
1516 (void) CloseHandle(con_out_ours);
1517 SetConsoleActiveScreenBuffer(con_out_save);
1518 con_out = con_out_save;
1524 * Initialize terminal
1531 tputs(sc_init, sc_height, putchr);
1533 tputs(sc_s_keypad, sc_height, putchr);
1539 * This is nice to terminals with no alternate screen,
1540 * but with saved scrolled-off-the-top lines. This way,
1541 * no previous line is lost, but we start with a whole
1542 * screen to ourself.
1544 for (i = 1; i < sc_height; i++)
1548 #if MSDOS_COMPILER==WIN32C
1559 * Deinitialize terminal
1568 tputs(sc_e_keypad, sc_height, putchr);
1570 tputs(sc_deinit, sc_height, putchr);
1572 /* Restore system colors. */
1573 SETCOLORS(sy_fg_color, sy_bg_color);
1574 #if MSDOS_COMPILER==WIN32C
1576 win32_deinit_term();
1578 /* Need clreol to make SETCOLORS take effect. */
1586 * Home cursor (move to upper left corner of screen).
1592 tputs(sc_home, 1, putchr);
1595 _settextposition(1,1);
1600 * Add a blank line (called with cursor at home).
1601 * Should scroll the display down.
1607 tputs(sc_addline, sc_height, putchr);
1610 #if MSDOS_COMPILER==MSOFTC
1611 _scrolltextwindow(_GSCROLLDOWN);
1612 _settextposition(1,1);
1614 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1615 movetext(1,1, sc_width,sc_height-1, 1,2);
1619 #if MSDOS_COMPILER==WIN32C
1622 SMALL_RECT rcSrc, rcClip;
1624 CONSOLE_SCREEN_BUFFER_INFO csbi;
1626 GetConsoleScreenBufferInfo(con_out,&csbi);
1628 /* The clip rectangle is the entire visible screen. */
1629 rcClip.Left = csbi.srWindow.Left;
1630 rcClip.Top = csbi.srWindow.Top;
1631 rcClip.Right = csbi.srWindow.Right;
1632 rcClip.Bottom = csbi.srWindow.Bottom;
1634 /* The source rectangle is the visible screen minus the last line. */
1638 /* Move the top left corner of the source window down one row. */
1639 new_org.X = rcSrc.Left;
1640 new_org.Y = rcSrc.Top + 1;
1642 /* Fill the right character and attributes. */
1643 fillchar.Char.AsciiChar = ' ';
1644 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1645 fillchar.Attributes = curr_attr;
1646 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1647 _settextposition(1,1);
1657 * Remove the n topmost lines and scroll everything below it in the
1658 * window upward. This is needed to stop leaking the topmost line
1659 * into the scrollback buffer when we go down-one-line (in WIN32).
1665 #if MSDOS_COMPILER==WIN32C
1666 SMALL_RECT rcSrc, rcClip;
1669 CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
1671 if (n >= sc_height - 1)
1680 GetConsoleScreenBufferInfo(con_out, &csbi);
1682 /* Get the extent of all-visible-rows-but-the-last. */
1683 rcSrc.Left = csbi.srWindow.Left;
1684 rcSrc.Top = csbi.srWindow.Top + n;
1685 rcSrc.Right = csbi.srWindow.Right;
1686 rcSrc.Bottom = csbi.srWindow.Bottom;
1688 /* Get the clip rectangle. */
1689 rcClip.Left = rcSrc.Left;
1690 rcClip.Top = csbi.srWindow.Top;
1691 rcClip.Right = rcSrc.Right;
1692 rcClip.Bottom = rcSrc.Bottom ;
1694 /* Move the source window up n rows. */
1695 new_org.X = rcSrc.Left;
1696 new_org.Y = rcSrc.Top - n;
1698 /* Fill the right character and attributes. */
1699 fillchar.Char.AsciiChar = ' ';
1700 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1701 fillchar.Attributes = curr_attr;
1703 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1705 /* Position cursor on first blank line. */
1706 goto_line(sc_height - n - 1);
1711 #if MSDOS_COMPILER==WIN32C
1719 * This will clear only the currently visible rows of the NT
1720 * console buffer, which means none of the precious scrollback
1721 * rows are touched making for faster scrolling. Note that, if
1722 * the window has fewer columns than the console buffer (i.e.
1723 * there is a horizontal scrollbar as well), the entire width
1724 * of the visible rows will be cleared.
1729 CONSOLE_SCREEN_BUFFER_INFO csbi;
1731 /* get the number of cells in the current buffer */
1732 GetConsoleScreenBufferInfo(con_out, &csbi);
1733 winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
1735 topleft.Y = csbi.srWindow.Top;
1737 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1738 FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
1739 FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
1743 * Remove the n topmost lines and scroll everything below it in the
1750 SMALL_RECT rcSrc, rcClip;
1756 CONSOLE_SCREEN_BUFFER_INFO csbi;
1761 if (n >= sc_height - 1)
1764 _settextposition(1,1);
1768 /* Get the extent of what will remain visible after scrolling. */
1769 GetConsoleScreenBufferInfo(con_out, &csbi);
1770 rcSrc.Left = csbi.srWindow.Left;
1771 rcSrc.Top = csbi.srWindow.Top + n;
1772 rcSrc.Right = csbi.srWindow.Right;
1773 rcSrc.Bottom = csbi.srWindow.Bottom;
1775 /* Get the clip rectangle. */
1776 rcClip.Left = rcSrc.Left;
1777 rcClip.Top = csbi.srWindow.Top;
1778 rcClip.Right = rcSrc.Right;
1779 rcClip.Bottom = rcSrc.Bottom ;
1781 /* Move the source text to the top of the screen. */
1782 new_org.X = rcSrc.Left;
1785 /* Fill the right character and attributes. */
1786 fillchar.Char.AsciiChar = ' ';
1787 fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);
1789 /* Scroll the window. */
1790 SetConsoleTextAttribute(con_out, fillchar.Attributes);
1791 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1793 /* Clear remaining lines at bottom. */
1794 topleft.X = csbi.dwCursorPosition.X;
1795 topleft.Y = rcSrc.Bottom - n;
1796 size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
1797 FillConsoleOutputCharacter(con_out, ' ', size, topleft,
1799 FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
1801 SetConsoleTextAttribute(con_out, curr_attr);
1803 /* Move cursor n lines up from where it was. */
1804 csbi.dwCursorPosition.Y -= n;
1805 SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
1810 * Move cursor to lower left corner of screen.
1816 tputs(sc_lower_left, 1, putchr);
1819 _settextposition(sc_height, 1);
1824 * Move cursor to left position of current line.
1830 tputs(sc_return, 1, putchr);
1834 #if MSDOS_COMPILER==WIN32C
1836 CONSOLE_SCREEN_BUFFER_INFO scr;
1837 GetConsoleScreenBufferInfo(con_out, &scr);
1838 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
1842 struct rccoord tpos = _gettextposition();
1846 _settextposition(row, 1);
1851 * Check if the console size has changed and reset internals
1852 * (in lieu of SIGWINCH for WIN32).
1857 #if MSDOS_COMPILER==WIN32C
1858 CONSOLE_SCREEN_BUFFER_INFO scr;
1861 if (con_out == INVALID_HANDLE_VALUE)
1865 GetConsoleScreenBufferInfo(con_out, &scr);
1866 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1867 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1868 if (size.Y != sc_height || size.X != sc_width)
1872 if (!no_init && con_out_ours == con_out)
1873 SetConsoleScreenBufferSize(con_out, size);
1875 wscroll = (sc_height + 1) / 2;
1882 * Goto a specific line on the screen.
1889 tputs(tgoto(sc_move, 0, slinenum), 1, putchr);
1892 _settextposition(slinenum+1, 1);
1896 #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
1898 * Create an alternate screen which is all white.
1899 * This screen is used to create a "flash" effect, by displaying it
1900 * briefly and then switching back to the normal screen.
1901 * {{ Yuck! There must be a better way to get a visual bell. }}
1906 #if MSDOS_COMPILER==MSOFTC
1907 struct videoconfig w;
1911 _getvideoconfig(&w);
1912 videopages = w.numvideopages;
1915 at_enter(AT_STANDOUT);
1920 at_enter(AT_STANDOUT);
1921 blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
1922 for (col = 0; col < w.numtextcols; col++)
1924 for (row = w.numtextrows; row > 0; row--)
1925 _outmem(blanks, w.numtextcols);
1932 #if MSDOS_COMPILER==BORLANDC
1935 whitescreen = (unsigned short *)
1936 malloc(sc_width * sc_height * sizeof(short));
1937 if (whitescreen == NULL)
1939 for (n = 0; n < sc_width * sc_height; n++)
1940 whitescreen[n] = 0x7020;
1942 #if MSDOS_COMPILER==WIN32C
1945 whitescreen = (WORD *)
1946 malloc(sc_height * sc_width * sizeof(WORD));
1947 if (whitescreen == NULL)
1949 /* Invert the standard colors. */
1950 for (n = 0; n < sc_width * sc_height; n++)
1951 whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
1957 #endif /* MSDOS_COMPILER */
1960 * Output the "visual bell", if there is one.
1966 if (*sc_visual_bell == '\0')
1968 tputs(sc_visual_bell, sc_height, putchr);
1970 #if MSDOS_COMPILER==DJGPPC
1973 #if MSDOS_COMPILER==MSOFTC
1975 * Create a flash screen on the second video page.
1976 * Switch to that page, then switch back.
1986 #if MSDOS_COMPILER==BORLANDC
1987 unsigned short *currscreen;
1990 * Get a copy of the current screen.
1991 * Display the flash screen.
1992 * Then restore the old screen.
1996 if (whitescreen == NULL)
1998 currscreen = (unsigned short *)
1999 malloc(sc_width * sc_height * sizeof(short));
2000 if (currscreen == NULL) return;
2001 gettext(1, 1, sc_width, sc_height, currscreen);
2002 puttext(1, 1, sc_width, sc_height, whitescreen);
2004 puttext(1, 1, sc_width, sc_height, currscreen);
2007 #if MSDOS_COMPILER==WIN32C
2008 /* paint screen with an inverse color */
2011 /* leave it displayed for 100 msec. */
2014 /* restore with a redraw */
2030 putchr(CONTROL('G'));
2032 #if MSDOS_COMPILER==WIN32C
2041 * Ring the terminal bell.
2046 if (quiet == VERY_QUIET)
2059 tputs(sc_clear, sc_height, putchr);
2062 #if MSDOS_COMPILER==WIN32C
2065 _clearscreen(_GCLEARSCREEN);
2071 * Clear from the cursor to the end of the cursor's line.
2072 * {{ This must not move the cursor. }}
2078 tputs(sc_eol_clear, 1, putchr);
2080 #if MSDOS_COMPILER==MSOFTC
2083 struct rccoord tpos;
2087 * Save current state.
2089 tpos = _gettextposition();
2090 _gettextwindow(&top, &left, &bot, &right);
2092 * Set a temporary window to the current line,
2093 * from the cursor's position to the right edge of the screen.
2094 * Then clear that window.
2096 _settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
2097 _clearscreen(_GWINDOW);
2101 _settextwindow(top, left, bot, right);
2102 _settextposition(tpos.row, tpos.col);
2104 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2108 #if MSDOS_COMPILER==WIN32C
2111 CONSOLE_SCREEN_BUFFER_INFO scr;
2114 memset(&scr, 0, sizeof(scr));
2115 GetConsoleScreenBufferInfo(con_out, &scr);
2116 cpos.X = scr.dwCursorPosition.X;
2117 cpos.Y = scr.dwCursorPosition.Y;
2118 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
2119 FillConsoleOutputAttribute(con_out, curr_attr,
2120 scr.dwSize.X - cpos.X, cpos, &nchars);
2121 FillConsoleOutputCharacter(con_out, ' ',
2122 scr.dwSize.X - cpos.X, cpos, &nchars);
2130 * Clear the current line.
2131 * Clear the screen if there's off-screen memory below the display.
2140 tputs(sc_eos_clear, 1, putchr);
2142 tputs(sc_eol_clear, 1, putchr);
2147 * Clear the bottom line of the display.
2148 * Leave the cursor at the beginning of the bottom line.
2154 * If we're in a non-normal attribute mode, temporarily exit
2155 * the mode while we do the clear. Some terminals fill the
2156 * cleared area with the current attribute.
2163 if (attrmode == AT_NORMAL)
2167 int saved_attrmode = attrmode;
2171 at_enter(saved_attrmode);
2179 attr = apply_at_specials(attr);
2182 /* The one with the most priority is last. */
2183 if (attr & AT_UNDERLINE)
2184 tputs(sc_u_in, 1, putchr);
2186 tputs(sc_b_in, 1, putchr);
2187 if (attr & AT_BLINK)
2188 tputs(sc_bl_in, 1, putchr);
2189 if (attr & AT_STANDOUT)
2190 tputs(sc_s_in, 1, putchr);
2193 /* The one with the most priority is first. */
2194 if (attr & AT_STANDOUT)
2196 SETCOLORS(so_fg_color, so_bg_color);
2197 } else if (attr & AT_BLINK)
2199 SETCOLORS(bl_fg_color, bl_bg_color);
2201 else if (attr & AT_BOLD)
2203 SETCOLORS(bo_fg_color, bo_bg_color);
2205 else if (attr & AT_UNDERLINE)
2207 SETCOLORS(ul_fg_color, ul_bg_color);
2218 /* Undo things in the reverse order we did them. */
2219 if (attrmode & AT_STANDOUT)
2220 tputs(sc_s_out, 1, putchr);
2221 if (attrmode & AT_BLINK)
2222 tputs(sc_bl_out, 1, putchr);
2223 if (attrmode & AT_BOLD)
2224 tputs(sc_b_out, 1, putchr);
2225 if (attrmode & AT_UNDERLINE)
2226 tputs(sc_u_out, 1, putchr);
2229 SETCOLORS(nm_fg_color, nm_bg_color);
2232 attrmode = AT_NORMAL;
2239 int new_attrmode = apply_at_specials(attr);
2240 int ignore_modes = AT_ANSI;
2242 if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
2250 is_at_equiv(attr1, attr2)
2254 attr1 = apply_at_specials(attr1);
2255 attr2 = apply_at_specials(attr2);
2257 return (attr1 == attr2);
2261 apply_at_specials(attr)
2264 if (attr & AT_BINARY)
2266 if (attr & AT_HILITE)
2267 attr |= AT_STANDOUT;
2268 attr &= ~(AT_BINARY|AT_HILITE);
2273 #if 0 /* No longer used */
2275 * Erase the character to the left of the cursor
2276 * and move the cursor left.
2283 * Erase the previous character by overstriking with a space.
2285 tputs(sc_backspace, 1, putchr);
2287 tputs(sc_backspace, 1, putchr);
2289 #if MSDOS_COMPILER==MSOFTC
2290 struct rccoord tpos;
2293 tpos = _gettextposition();
2296 _settextposition(tpos.row, tpos.col-1);
2298 _settextposition(tpos.row, tpos.col-1);
2300 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2303 #if MSDOS_COMPILER==WIN32C
2306 CONSOLE_SCREEN_BUFFER_INFO scr;
2309 GetConsoleScreenBufferInfo(con_out, &scr);
2310 cpos = scr.dwCursorPosition;
2314 SetConsoleCursorPosition(con_out, cpos);
2315 FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
2316 SetConsoleCursorPosition(con_out, cpos);
2325 * Output a plain backspace, without erasing the previous char.
2331 tputs(sc_backspace, 1, putchr);
2337 #if MSDOS_COMPILER==MSOFTC
2338 struct rccoord tpos;
2339 tpos = _gettextposition();
2343 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2347 #if MSDOS_COMPILER==WIN32C
2348 CONSOLE_SCREEN_BUFFER_INFO scr;
2349 GetConsoleScreenBufferInfo(con_out, &scr);
2350 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
2351 col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
2358 _settextposition(row, col-1);
2359 #endif /* MSDOS_COMPILER */
2362 #if MSDOS_COMPILER==WIN32C
2364 * Determine whether an input character is waiting to be read.
2376 currentKey.ascii = 0;
2377 currentKey.scan = 0;
2380 * Wait for a real key-down event, but
2381 * ignore SHIFT and CONTROL key events.
2385 PeekConsoleInput(tty, &ip, 1, &read);
2388 ReadConsoleInput(tty, &ip, 1, &read);
2389 } while (ip.EventType != KEY_EVENT ||
2390 ip.Event.KeyEvent.bKeyDown != TRUE ||
2391 ip.Event.KeyEvent.wVirtualScanCode == 0 ||
2392 ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
2393 ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
2394 ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
2396 currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
2397 currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
2398 keyCount = ip.Event.KeyEvent.wRepeatCount;
2400 if (ip.Event.KeyEvent.dwControlKeyState &
2401 (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
2403 switch (currentKey.scan)
2405 case PCK_ALT_E: /* letter 'E' */
2406 currentKey.ascii = 0;
2409 } else if (ip.Event.KeyEvent.dwControlKeyState &
2410 (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
2412 switch (currentKey.scan)
2414 case PCK_RIGHT: /* right arrow */
2415 currentKey.scan = PCK_CTL_RIGHT;
2417 case PCK_LEFT: /* left arrow */
2418 currentKey.scan = PCK_CTL_LEFT;
2420 case PCK_DELETE: /* delete */
2421 currentKey.scan = PCK_CTL_DELETE;
2429 * Read a character from the keyboard.
2437 if (pending_scancode)
2439 pending_scancode = 0;
2440 return ((char)(currentKey.scan & 0x00FF));
2443 while (win32_kbhit((HANDLE)tty) == FALSE)
2451 ascii = currentKey.ascii;
2453 * On PC's, the extended keys return a 2 byte sequence beginning
2454 * with '00', so if the ascii code is 00, the next byte will be
2455 * the lsb of the scan code.
2457 pending_scancode = (ascii == 0x00);
2458 return ((char)ascii);