2 * Copyright (C) 1984-2007 Mark Nudelman
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
13 * Routines which deal with the characteristics of the terminal.
14 * Uses termcap to be as terminal-independent as possible.
22 #if MSDOS_COMPILER==MSOFTC
25 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
27 #if MSDOS_COMPILER==DJGPPC
32 #if MSDOS_COMPILER==WIN32C
42 #include <sys/ioctl.h>
45 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
66 #include <sys/signal.h>
70 #include <sys/stream.h>
76 #endif /* MSDOS_COMPILER */
79 * Check for broken termios package that forces you to manually
80 * set the line discipline.
83 #define MUST_SET_LINE_DISCIPLINE 1
85 #define MUST_SET_LINE_DISCIPLINE 0
89 #define DEFAULT_TERM "ansi"
90 static char *windowid;
92 #define DEFAULT_TERM "unknown"
95 #if MSDOS_COMPILER==MSOFTC
96 static int videopages;
97 static long msec_loops;
98 static int flash_created = 0;
99 #define SETCOLORS(fg,bg) { _settextcolor(fg); _setbkcolor(bg); }
102 #if MSDOS_COMPILER==BORLANDC
103 static unsigned short *whitescreen;
104 static int flash_created = 0;
106 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
107 #define _settextposition(y,x) gotoxy(x,y)
108 #define _clearscreen(m) clrscr()
109 #define _outtext(s) cputs(s)
110 #define SETCOLORS(fg,bg) { textcolor(fg); textbackground(bg); }
111 extern int sc_height;
114 #if MSDOS_COMPILER==WIN32C
121 static int keyCount = 0;
122 static WORD curr_attr;
123 static int pending_scancode = 0;
124 static WORD *whitescreen;
126 static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
127 static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
128 HANDLE con_out = INVALID_HANDLE_VALUE; /* current console */
131 static void win32_init_term();
132 static void win32_deinit_term();
134 #define FG_COLORS (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
135 #define BG_COLORS (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
136 #define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4)))
137 #define SETCOLORS(fg,bg) { curr_attr = MAKEATTR(fg,bg); \
138 if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
139 error("SETCOLORS failed"); }
143 public int nm_fg_color; /* Color of normal text */
144 public int nm_bg_color;
145 public int bo_fg_color; /* Color of bold text */
146 public int bo_bg_color;
147 public int ul_fg_color; /* Color of underlined text */
148 public int ul_bg_color;
149 public int so_fg_color; /* Color of standout text */
150 public int so_bg_color;
151 public int bl_fg_color; /* Color of blinking text */
152 public int bl_bg_color;
153 static int sy_fg_color; /* Color of system text (before less) */
154 static int sy_bg_color;
159 * Strings passed to tputs() to do various terminal functions.
162 *sc_pad, /* Pad string */
163 *sc_home, /* Cursor home */
164 *sc_addline, /* Add line, scroll down following lines */
165 *sc_lower_left, /* Cursor to last line, first column */
166 *sc_return, /* Cursor to beginning of current line */
167 *sc_move, /* General cursor positioning */
168 *sc_clear, /* Clear screen */
169 *sc_eol_clear, /* Clear to end of line */
170 *sc_eos_clear, /* Clear to end of screen */
171 *sc_s_in, /* Enter standout (highlighted) mode */
172 *sc_s_out, /* Exit standout mode */
173 *sc_u_in, /* Enter underline mode */
174 *sc_u_out, /* Exit underline mode */
175 *sc_b_in, /* Enter bold mode */
176 *sc_b_out, /* Exit bold mode */
177 *sc_bl_in, /* Enter blink mode */
178 *sc_bl_out, /* Exit blink mode */
179 *sc_visual_bell, /* Visual bell (flash screen) sequence */
180 *sc_backspace, /* Backspace cursor */
181 *sc_s_keypad, /* Start keypad mode */
182 *sc_e_keypad, /* End keypad mode */
183 *sc_init, /* Startup terminal initialization */
184 *sc_deinit; /* Exit terminal de-initialization */
187 static int init_done = 0;
189 public int auto_wrap; /* Terminal does \r\n when write past margin */
190 public int ignaw; /* Terminal ignores \n immediately after wrap */
191 public int erase_char; /* The user's erase char */
192 public int erase2_char; /* The user's other erase char */
193 public int kill_char; /* The user's line-kill char */
194 public int werase_char; /* The user's word-erase char */
195 public int sc_width, sc_height; /* Height & width of screen */
196 public int bo_s_width, bo_e_width; /* Printing width of boldface seq */
197 public int ul_s_width, ul_e_width; /* Printing width of underline seq */
198 public int so_s_width, so_e_width; /* Printing width of standout seq */
199 public int bl_s_width, bl_e_width; /* Printing width of blink seq */
200 public int above_mem, below_mem; /* Memory retained above/below screen */
201 public int can_goto_line; /* Can move cursor to any line */
202 public int clear_bg; /* Clear fills with background color */
203 public int missing_cap = 0; /* Some capability is missing */
205 static int attrmode = AT_NORMAL;
209 static char *cheaper();
210 static void tmodes();
214 * These two variables are sometimes defined in,
215 * and needed by, the termcap library.
217 #if MUST_DEFINE_OSPEED
218 extern short ospeed; /* Terminal output baud rate */
219 extern char PC; /* Pad character */
226 extern int quiet; /* If VERY_QUIET, use visual bell for bell */
227 extern int no_back_scroll;
230 extern int no_keypad;
233 extern int screen_trashed;
235 extern int top_scroll;
238 extern int hilite_search;
241 extern char *tgetstr();
242 extern char *tgoto();
246 * Change terminal to "raw mode", or restore to "normal" mode.
248 * 1. An outstanding read will complete on receipt of a single keystroke.
249 * 2. Input is not echoed.
250 * 3. On output, \n is mapped to \r\n.
251 * 4. \t is NOT expanded into spaces.
252 * 5. Signal-causing characters such as ctrl-C (interrupt),
253 * etc. are NOT disabled.
254 * It doesn't matter whether an input \n is mapped to \r, or vice versa.
260 static int curr_on = 0;
264 erase2_char = '\b'; /* in case OS doesn't know about erase2 */
265 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
268 static struct termios save_term;
269 static int saved_term = 0;
274 * Get terminal modes.
279 * Save modes and set certain variables dependent on modes.
287 switch (cfgetospeed(&s))
290 case B0: ospeed = 0; break;
293 case B50: ospeed = 1; break;
296 case B75: ospeed = 2; break;
299 case B110: ospeed = 3; break;
302 case B134: ospeed = 4; break;
305 case B150: ospeed = 5; break;
308 case B200: ospeed = 6; break;
311 case B300: ospeed = 7; break;
314 case B600: ospeed = 8; break;
317 case B1200: ospeed = 9; break;
320 case B1800: ospeed = 10; break;
323 case B2400: ospeed = 11; break;
326 case B4800: ospeed = 12; break;
329 case B9600: ospeed = 13; break;
332 case EXTA: ospeed = 14; break;
335 case EXTB: ospeed = 15; break;
338 case B57600: ospeed = 16; break;
341 case B115200: ospeed = 17; break;
346 erase_char = s.c_cc[VERASE];
348 erase2_char = s.c_cc[VERASE2];
350 kill_char = s.c_cc[VKILL];
352 werase_char = s.c_cc[VWERASE];
354 werase_char = CONTROL('W');
358 * Set the modes to the way we want them.
420 #if MUST_SET_LINE_DISCIPLINE
422 * System's termios is broken; need to explicitly
423 * request TERMIODISC line discipline.
425 s.c_line = TERMIODISC;
430 * Restore saved modes.
437 tcsetattr(tty, TCSADRAIN, &s);
438 #if MUST_SET_LINE_DISCIPLINE
442 * Broken termios *ignores* any line discipline
443 * except TERMIODISC. A different old line discipline
444 * is therefore not restored, yet. Restore the old
445 * line discipline by hand.
447 ioctl(tty, TIOCSETD, &save_term.c_line);
455 static struct termio save_term;
456 static int saved_term = 0;
461 * Get terminal modes.
463 ioctl(tty, TCGETA, &s);
466 * Save modes and set certain variables dependent on modes.
474 ospeed = s.c_cflag & CBAUD;
476 erase_char = s.c_cc[VERASE];
477 kill_char = s.c_cc[VKILL];
479 werase_char = s.c_cc[VWERASE];
481 werase_char = CONTROL('W');
485 * Set the modes to the way we want them.
487 s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL);
488 s.c_oflag |= (OPOST|ONLCR|TAB3);
489 s.c_oflag &= ~(OCRNL|ONOCR|ONLRET);
495 * Restore saved modes.
499 ioctl(tty, TCSETAW, &s);
505 static struct sgttyb save_term;
506 static int saved_term = 0;
511 * Get terminal modes.
513 ioctl(tty, TIOCGETP, &s);
516 * Save modes and set certain variables dependent on modes.
524 ospeed = s.sg_ospeed;
526 erase_char = s.sg_erase;
527 kill_char = s.sg_kill;
528 werase_char = CONTROL('W');
531 * Set the modes to the way we want them.
533 s.sg_flags |= CBREAK;
534 s.sg_flags &= ~(ECHO|XTABS);
538 * Restore saved modes.
542 ioctl(tty, TIOCSETN, &s);
548 static struct sgbuf save_term;
549 static int saved_term = 0;
554 * Get terminal modes.
559 * Save modes and set certain variables dependent on modes.
566 erase_char = s.sg_bspch;
567 kill_char = s.sg_dlnch;
568 werase_char = CONTROL('W');
571 * Set the modes to the way we want them.
580 * Restore saved modes.
587 /* MS-DOS, Windows, or OS2 */
590 LSIGNAL(SIGINT, SIG_IGN);
593 #if MSDOS_COMPILER==DJGPPC
594 kill_char = CONTROL('U');
596 * So that when we shell out or run another program, its
597 * stdin is in cooked mode. We do not switch stdin to binary
598 * mode if fd0 is zero, since that means we were called before
599 * tty was reopened in open_getchr, in which case we would be
600 * changing the original stdin device outside less.
603 setmode(0, on ? O_BINARY : O_TEXT);
607 werase_char = CONTROL('W');
617 * Some glue to prevent calling termcap functions if tgetent() failed.
627 strcpy(name, "LESS_TERMCAP_");
628 strcat(name, capname);
629 return (lgetenv(name));
638 if ((s = ltget_env(capname)) != NULL)
639 return (*s != '\0' && *s != '0');
642 return (tgetflag(capname));
651 if ((s = ltget_env(capname)) != NULL)
655 return (tgetnum(capname));
659 ltgetstr(capname, pp)
665 if ((s = ltget_env(capname)) != NULL)
669 return (tgetstr(capname, pp));
671 #endif /* MSDOS_COMPILER */
674 * Get size of the output screen.
686 #define DEF_SC_WIDTH 80
688 #define DEF_SC_HEIGHT 25
690 #define DEF_SC_HEIGHT 24
694 sys_width = sys_height = 0;
696 #if MSDOS_COMPILER==MSOFTC
698 struct videoconfig w;
700 sys_height = w.numtextrows;
701 sys_width = w.numtextcols;
704 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
708 sys_height = w.screenheight;
709 sys_width = w.screenwidth;
712 #if MSDOS_COMPILER==WIN32C
714 CONSOLE_SCREEN_BUFFER_INFO scr;
715 GetConsoleScreenBufferInfo(con_out, &scr);
716 sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
717 sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
727 * When using terminal emulators for XFree86/OS2, the
728 * _scrsize function does not work well.
729 * Call the scrsize.exe program to get the window size.
731 windowid = getenv("WINDOWID");
732 if (windowid != NULL)
734 FILE *fd = popen("scrsize", "rt");
738 fscanf(fd, "%i %i", &w, &h);
752 if (ioctl(2, TIOCGWINSZ, &w) == 0)
755 sys_height = w.ws_row;
757 sys_width = w.ws_col;
764 if (ioctl(2, WIOCGETD, &w) == 0)
767 sys_height = w.uw_height / w.uw_vs;
769 sys_width = w.uw_width / w.uw_hs;
780 sc_height = sys_height;
781 else if ((s = lgetenv("LINES")) != NULL)
784 else if ((n = ltgetnum("li")) > 0)
788 sc_height = DEF_SC_HEIGHT;
791 sc_width = sys_width;
792 else if ((s = lgetenv("COLUMNS")) != NULL)
795 else if ((n = ltgetnum("co")) > 0)
799 sc_width = DEF_SC_WIDTH;
802 #if MSDOS_COMPILER==MSOFTC
804 * Figure out how many empty loops it takes to delay a millisecond.
812 * Get synchronized at the start of a tick.
815 while (clock() == start)
818 * Now count loops till the next tick.
822 while (clock() == start)
825 * Convert from (loops per clock) to (loops per millisecond).
827 msec_loops *= CLOCKS_PER_SEC;
832 * Delay for a specified number of milliseconds.
837 static long delay_dummy = 0;
849 for (i = 0; i < msec_loops; i++)
852 * Make it look like we're doing something here,
853 * so the optimizer doesn't remove the whole loop.
862 * Return the characters actually input by a "special" key.
868 static char tbuf[40];
870 #if MSDOS_COMPILER || OS2
871 static char k_right[] = { '\340', PCK_RIGHT, 0 };
872 static char k_left[] = { '\340', PCK_LEFT, 0 };
873 static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 };
874 static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 };
875 static char k_insert[] = { '\340', PCK_INSERT, 0 };
876 static char k_delete[] = { '\340', PCK_DELETE, 0 };
877 static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 };
878 static char k_ctl_backspace[] = { '\177', 0 };
879 static char k_home[] = { '\340', PCK_HOME, 0 };
880 static char k_end[] = { '\340', PCK_END, 0 };
881 static char k_up[] = { '\340', PCK_UP, 0 };
882 static char k_down[] = { '\340', PCK_DOWN, 0 };
883 static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 };
884 static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 };
885 static char k_pageup[] = { '\340', PCK_PAGEUP, 0 };
886 static char k_f1[] = { '\340', PCK_F1, 0 };
896 * If windowid is not NULL, assume less is executed in
897 * the XFree86 environment.
900 s = windowid ? ltgetstr("kr", &sp) : k_right;
903 s = windowid ? ltgetstr("kl", &sp) : k_left;
906 s = windowid ? ltgetstr("ku", &sp) : k_up;
909 s = windowid ? ltgetstr("kd", &sp) : k_down;
912 s = windowid ? ltgetstr("kP", &sp) : k_pageup;
915 s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
918 s = windowid ? ltgetstr("kh", &sp) : k_home;
921 s = windowid ? ltgetstr("@7", &sp) : k_end;
926 s = ltgetstr("kD", &sp);
966 #if MSDOS_COMPILER || OS2
970 case SK_CTL_LEFT_ARROW:
973 case SK_CTL_RIGHT_ARROW:
976 case SK_CTL_BACKSPACE:
990 s = ltgetstr("kr", &sp);
993 s = ltgetstr("kl", &sp);
996 s = ltgetstr("ku", &sp);
999 s = ltgetstr("kd", &sp);
1002 s = ltgetstr("kP", &sp);
1005 s = ltgetstr("kN", &sp);
1008 s = ltgetstr("kh", &sp);
1011 s = ltgetstr("@7", &sp);
1014 s = ltgetstr("kD", &sp);
1024 tbuf[0] = CONTROL('K');
1035 * Get terminal capabilities via termcap.
1046 * Set up default colors.
1047 * The xx_s_width and xx_e_width vars are already initialized to 0.
1049 #if MSDOS_COMPILER==MSOFTC
1050 sy_bg_color = _getbkcolor();
1051 sy_fg_color = _gettextcolor();
1054 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1058 sy_bg_color = (w.attribute >> 4) & 0x0F;
1059 sy_fg_color = (w.attribute >> 0) & 0x0F;
1062 #if MSDOS_COMPILER==WIN32C
1065 CONSOLE_SCREEN_BUFFER_INFO scr;
1067 con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
1069 * Always open stdin in binary. Note this *must* be done
1070 * before any file operations have been done on fd0.
1073 GetConsoleScreenBufferInfo(con_out, &scr);
1074 ReadConsoleOutputAttribute(con_out, &curr_attr,
1075 1, scr.dwCursorPosition, &nread);
1076 sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
1077 sy_fg_color = curr_attr & FG_COLORS;
1082 nm_fg_color = sy_fg_color;
1083 nm_bg_color = sy_bg_color;
1094 * Get size of the screen.
1100 #else /* !MSDOS_COMPILER */
1103 register char *t1, *t2;
1105 char termbuf[TERMBUF_SIZE];
1107 static char sbuf[TERMSBUF_SIZE];
1111 * Make sure the termcap database is available.
1113 sp = lgetenv("TERMCAP");
1114 if (sp == NULL || *sp == '\0')
1117 if ((sp = homefile("termcap.dat")) != NULL)
1119 termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
1120 sprintf(termcap, "TERMCAP=%s", sp);
1127 * Find out what kind of terminal this is.
1129 if ((term = lgetenv("TERM")) == NULL)
1130 term = DEFAULT_TERM;
1132 if (tgetent(termbuf, term) != TGETENT_OK)
1134 if (ltgetflag("hc"))
1138 * Get size of the screen.
1143 auto_wrap = ltgetflag("am");
1144 ignaw = ltgetflag("xn");
1145 above_mem = ltgetflag("da");
1146 below_mem = ltgetflag("db");
1147 clear_bg = ltgetflag("ut");
1150 * Assumes termcap variable "sg" is the printing width of:
1151 * the standout sequence, the end standout sequence,
1152 * the underline sequence, the end underline sequence,
1153 * the boldface sequence, and the end boldface sequence.
1155 if ((so_s_width = ltgetnum("sg")) < 0)
1157 so_e_width = so_s_width;
1159 bo_s_width = bo_e_width = so_s_width;
1160 ul_s_width = ul_e_width = so_s_width;
1161 bl_s_width = bl_e_width = so_s_width;
1164 if (so_s_width > 0 || so_e_width > 0)
1166 * Disable highlighting by default on magic cookie terminals.
1167 * Turning on highlighting might change the displayed width
1168 * of a line, causing the display to get messed up.
1169 * The user can turn it back on with -g,
1170 * but she won't like the results.
1176 * Get various string-valued capabilities.
1181 sc_pad = ltgetstr("pc", &sp);
1186 sc_s_keypad = ltgetstr("ks", &sp);
1187 if (sc_s_keypad == NULL)
1189 sc_e_keypad = ltgetstr("ke", &sp);
1190 if (sc_e_keypad == NULL)
1193 sc_init = ltgetstr("ti", &sp);
1194 if (sc_init == NULL)
1197 sc_deinit= ltgetstr("te", &sp);
1198 if (sc_deinit == NULL)
1201 sc_eol_clear = ltgetstr("ce", &sp);
1202 if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
1208 sc_eos_clear = ltgetstr("cd", &sp);
1209 if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
1215 sc_clear = ltgetstr("cl", &sp);
1216 if (sc_clear == NULL || *sc_clear == '\0')
1222 sc_move = ltgetstr("cm", &sp);
1223 if (sc_move == NULL || *sc_move == '\0')
1226 * This is not an error here, because we don't
1227 * always need sc_move.
1228 * We need it only if we don't have home or lower-left.
1235 tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
1236 tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
1237 tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
1238 tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);
1240 sc_visual_bell = ltgetstr("vb", &sp);
1241 if (sc_visual_bell == NULL)
1242 sc_visual_bell = "";
1244 if (ltgetflag("bs"))
1245 sc_backspace = "\b";
1248 sc_backspace = ltgetstr("bc", &sp);
1249 if (sc_backspace == NULL || *sc_backspace == '\0')
1250 sc_backspace = "\b";
1254 * Choose between using "ho" and "cm" ("home" and "cursor move")
1255 * to move the cursor to the upper left corner of the screen.
1257 t1 = ltgetstr("ho", &sp);
1260 if (*sc_move == '\0')
1264 strcpy(sp, tgoto(sc_move, 0, 0));
1266 sp += strlen(sp) + 1;
1268 sc_home = cheaper(t1, t2, "|\b^");
1271 * Choose between using "ll" and "cm" ("lower left" and "cursor move")
1272 * to move the cursor to the lower left corner of the screen.
1274 t1 = ltgetstr("ll", &sp);
1277 if (*sc_move == '\0')
1281 strcpy(sp, tgoto(sc_move, 0, sc_height-1));
1283 sp += strlen(sp) + 1;
1285 sc_lower_left = cheaper(t1, t2, "\r");
1288 * Get carriage return string.
1290 sc_return = ltgetstr("cr", &sp);
1291 if (sc_return == NULL)
1295 * Choose between using "al" or "sr" ("add line" or "scroll reverse")
1296 * to add a line at the top of the screen.
1298 t1 = ltgetstr("al", &sp);
1301 t2 = ltgetstr("sr", &sp);
1305 if (*t1 == '\0' && *t2 == '\0')
1312 sc_addline = cheaper(t1, t2, "");
1313 if (*sc_addline == '\0')
1316 * Force repaint on any backward movement.
1320 #endif /* MSDOS_COMPILER */
1325 * Return the cost of displaying a termcap string.
1326 * We use the trick of calling tputs, but as a char printing function
1327 * we give it inc_costcount, which just increments "costcount".
1328 * This tells us how many chars would be printed by using this string.
1329 * {{ Couldn't we just use strlen? }}
1331 static int costcount;
1347 tputs(t, sc_height, inc_costcount);
1352 * Return the "best" of the two given termcap strings.
1353 * The best, if both exist, is the one with the lower
1354 * cost (see cost() function).
1357 cheaper(t1, t2, def)
1361 if (*t1 == '\0' && *t2 == '\0')
1370 if (cost(t1) < cost(t2))
1376 tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
1385 *instr = ltgetstr(incap, spp);
1390 *outstr = def_outstr;
1394 *outstr = ltgetstr(outcap, spp);
1395 if (*outstr == NULL)
1396 /* No specific out capability; use "me". */
1397 *outstr = ltgetstr("me", spp);
1398 if (*outstr == NULL)
1399 /* Don't even have "me"; use a null string. */
1403 #endif /* MSDOS_COMPILER */
1407 * Below are the functions which perform all the
1408 * terminal-specific screen manipulation.
1414 #if MSDOS_COMPILER==WIN32C
1416 _settextposition(int row, int col)
1419 CONSOLE_SCREEN_BUFFER_INFO csbi;
1421 GetConsoleScreenBufferInfo(con_out, &csbi);
1422 cpos.X = csbi.srWindow.Left + (col - 1);
1423 cpos.Y = csbi.srWindow.Top + (row - 1);
1424 SetConsoleCursorPosition(con_out, cpos);
1429 * Initialize the screen to the correct color at startup.
1434 SETCOLORS(nm_fg_color, nm_bg_color);
1437 * This clears the screen at startup. This is different from
1438 * the behavior of other versions of less. Disable it for now.
1445 * Create a complete, blank screen using "normal" colors.
1447 SETCOLORS(nm_fg_color, nm_bg_color);
1448 blanks = (char *) ecalloc(width+1, sizeof(char));
1449 for (col = 0; col < sc_width; col++)
1451 blanks[sc_width] = '\0';
1452 for (row = 0; row < sc_height; row++)
1459 #if MSDOS_COMPILER==WIN32C
1462 * Termcap-like init with a private win32 console.
1467 CONSOLE_SCREEN_BUFFER_INFO scr;
1470 if (con_out_save == INVALID_HANDLE_VALUE)
1473 GetConsoleScreenBufferInfo(con_out_save, &scr);
1475 if (con_out_ours == INVALID_HANDLE_VALUE)
1478 * Create our own screen buffer, so that we
1479 * may restore the original when done.
1481 con_out_ours = CreateConsoleScreenBuffer(
1482 GENERIC_WRITE | GENERIC_READ,
1483 FILE_SHARE_WRITE | FILE_SHARE_READ,
1484 (LPSECURITY_ATTRIBUTES) NULL,
1485 CONSOLE_TEXTMODE_BUFFER,
1489 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1490 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1491 SetConsoleScreenBufferSize(con_out_ours, size);
1492 SetConsoleActiveScreenBuffer(con_out_ours);
1493 con_out = con_out_ours;
1497 * Restore the startup console.
1502 if (con_out_save == INVALID_HANDLE_VALUE)
1505 (void) CloseHandle(con_out_ours);
1506 SetConsoleActiveScreenBuffer(con_out_save);
1507 con_out = con_out_save;
1513 * Initialize terminal
1520 tputs(sc_init, sc_height, putchr);
1522 tputs(sc_s_keypad, sc_height, putchr);
1528 * This is nice to terminals with no alternate screen,
1529 * but with saved scrolled-off-the-top lines. This way,
1530 * no previous line is lost, but we start with a whole
1531 * screen to ourself.
1533 for (i = 1; i < sc_height; i++)
1537 #if MSDOS_COMPILER==WIN32C
1548 * Deinitialize terminal
1557 tputs(sc_e_keypad, sc_height, putchr);
1559 tputs(sc_deinit, sc_height, putchr);
1561 /* Restore system colors. */
1562 SETCOLORS(sy_fg_color, sy_bg_color);
1563 #if MSDOS_COMPILER==WIN32C
1565 win32_deinit_term();
1567 /* Need clreol to make SETCOLORS take effect. */
1575 * Home cursor (move to upper left corner of screen).
1581 tputs(sc_home, 1, putchr);
1584 _settextposition(1,1);
1589 * Add a blank line (called with cursor at home).
1590 * Should scroll the display down.
1596 tputs(sc_addline, sc_height, putchr);
1599 #if MSDOS_COMPILER==MSOFTC
1600 _scrolltextwindow(_GSCROLLDOWN);
1601 _settextposition(1,1);
1603 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1604 movetext(1,1, sc_width,sc_height-1, 1,2);
1608 #if MSDOS_COMPILER==WIN32C
1611 SMALL_RECT rcSrc, rcClip;
1613 CONSOLE_SCREEN_BUFFER_INFO csbi;
1615 GetConsoleScreenBufferInfo(con_out,&csbi);
1617 /* The clip rectangle is the entire visible screen. */
1618 rcClip.Left = csbi.srWindow.Left;
1619 rcClip.Top = csbi.srWindow.Top;
1620 rcClip.Right = csbi.srWindow.Right;
1621 rcClip.Bottom = csbi.srWindow.Bottom;
1623 /* The source rectangle is the visible screen minus the last line. */
1627 /* Move the top left corner of the source window down one row. */
1628 new_org.X = rcSrc.Left;
1629 new_org.Y = rcSrc.Top + 1;
1631 /* Fill the right character and attributes. */
1632 fillchar.Char.AsciiChar = ' ';
1633 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1634 fillchar.Attributes = curr_attr;
1635 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1636 _settextposition(1,1);
1646 * Remove the n topmost lines and scroll everything below it in the
1647 * window upward. This is needed to stop leaking the topmost line
1648 * into the scrollback buffer when we go down-one-line (in WIN32).
1654 #if MSDOS_COMPILER==WIN32C
1655 SMALL_RECT rcSrc, rcClip;
1658 CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
1660 if (n >= sc_height - 1)
1669 GetConsoleScreenBufferInfo(con_out, &csbi);
1671 /* Get the extent of all-visible-rows-but-the-last. */
1672 rcSrc.Left = csbi.srWindow.Left;
1673 rcSrc.Top = csbi.srWindow.Top + n;
1674 rcSrc.Right = csbi.srWindow.Right;
1675 rcSrc.Bottom = csbi.srWindow.Bottom;
1677 /* Get the clip rectangle. */
1678 rcClip.Left = rcSrc.Left;
1679 rcClip.Top = csbi.srWindow.Top;
1680 rcClip.Right = rcSrc.Right;
1681 rcClip.Bottom = rcSrc.Bottom ;
1683 /* Move the source window up n rows. */
1684 new_org.X = rcSrc.Left;
1685 new_org.Y = rcSrc.Top - n;
1687 /* Fill the right character and attributes. */
1688 fillchar.Char.AsciiChar = ' ';
1689 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1690 fillchar.Attributes = curr_attr;
1692 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1694 /* Position cursor on first blank line. */
1695 goto_line(sc_height - n - 1);
1700 #if MSDOS_COMPILER==WIN32C
1708 * This will clear only the currently visible rows of the NT
1709 * console buffer, which means none of the precious scrollback
1710 * rows are touched making for faster scrolling. Note that, if
1711 * the window has fewer columns than the console buffer (i.e.
1712 * there is a horizontal scrollbar as well), the entire width
1713 * of the visible rows will be cleared.
1718 CONSOLE_SCREEN_BUFFER_INFO csbi;
1720 /* get the number of cells in the current buffer */
1721 GetConsoleScreenBufferInfo(con_out, &csbi);
1722 winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
1724 topleft.Y = csbi.srWindow.Top;
1726 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1727 FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
1728 FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
1732 * Remove the n topmost lines and scroll everything below it in the
1739 SMALL_RECT rcSrc, rcClip;
1745 CONSOLE_SCREEN_BUFFER_INFO csbi;
1750 if (n >= sc_height - 1)
1753 _settextposition(1,1);
1757 /* Get the extent of what will remain visible after scrolling. */
1758 GetConsoleScreenBufferInfo(con_out, &csbi);
1759 rcSrc.Left = csbi.srWindow.Left;
1760 rcSrc.Top = csbi.srWindow.Top + n;
1761 rcSrc.Right = csbi.srWindow.Right;
1762 rcSrc.Bottom = csbi.srWindow.Bottom;
1764 /* Get the clip rectangle. */
1765 rcClip.Left = rcSrc.Left;
1766 rcClip.Top = csbi.srWindow.Top;
1767 rcClip.Right = rcSrc.Right;
1768 rcClip.Bottom = rcSrc.Bottom ;
1770 /* Move the source text to the top of the screen. */
1771 new_org.X = rcSrc.Left;
1774 /* Fill the right character and attributes. */
1775 fillchar.Char.AsciiChar = ' ';
1776 fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);
1778 /* Scroll the window. */
1779 SetConsoleTextAttribute(con_out, fillchar.Attributes);
1780 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1782 /* Clear remaining lines at bottom. */
1783 topleft.X = csbi.dwCursorPosition.X;
1784 topleft.Y = rcSrc.Bottom - n;
1785 size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
1786 FillConsoleOutputCharacter(con_out, ' ', size, topleft,
1788 FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
1790 SetConsoleTextAttribute(con_out, curr_attr);
1792 /* Move cursor n lines up from where it was. */
1793 csbi.dwCursorPosition.Y -= n;
1794 SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
1799 * Move cursor to lower left corner of screen.
1805 tputs(sc_lower_left, 1, putchr);
1808 _settextposition(sc_height, 1);
1813 * Move cursor to left position of current line.
1819 tputs(sc_return, 1, putchr);
1823 #if MSDOS_COMPILER==WIN32C
1825 CONSOLE_SCREEN_BUFFER_INFO scr;
1826 GetConsoleScreenBufferInfo(con_out, &scr);
1827 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
1831 struct rccoord tpos = _gettextposition();
1835 _settextposition(row, 1);
1840 * Check if the console size has changed and reset internals
1841 * (in lieu of SIGWINCH for WIN32).
1846 #if MSDOS_COMPILER==WIN32C
1847 CONSOLE_SCREEN_BUFFER_INFO scr;
1850 if (con_out == INVALID_HANDLE_VALUE)
1854 GetConsoleScreenBufferInfo(con_out, &scr);
1855 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1856 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1857 if (size.Y != sc_height || size.X != sc_width)
1861 if (!no_init && con_out_ours == con_out)
1862 SetConsoleScreenBufferSize(con_out, size);
1864 wscroll = (sc_height + 1) / 2;
1871 * Goto a specific line on the screen.
1878 tputs(tgoto(sc_move, 0, slinenum), 1, putchr);
1881 _settextposition(slinenum+1, 1);
1885 #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
1887 * Create an alternate screen which is all white.
1888 * This screen is used to create a "flash" effect, by displaying it
1889 * briefly and then switching back to the normal screen.
1890 * {{ Yuck! There must be a better way to get a visual bell. }}
1895 #if MSDOS_COMPILER==MSOFTC
1896 struct videoconfig w;
1900 _getvideoconfig(&w);
1901 videopages = w.numvideopages;
1904 at_enter(AT_STANDOUT);
1909 at_enter(AT_STANDOUT);
1910 blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
1911 for (col = 0; col < w.numtextcols; col++)
1913 for (row = w.numtextrows; row > 0; row--)
1914 _outmem(blanks, w.numtextcols);
1921 #if MSDOS_COMPILER==BORLANDC
1924 whitescreen = (unsigned short *)
1925 malloc(sc_width * sc_height * sizeof(short));
1926 if (whitescreen == NULL)
1928 for (n = 0; n < sc_width * sc_height; n++)
1929 whitescreen[n] = 0x7020;
1931 #if MSDOS_COMPILER==WIN32C
1934 whitescreen = (WORD *)
1935 malloc(sc_height * sc_width * sizeof(WORD));
1936 if (whitescreen == NULL)
1938 /* Invert the standard colors. */
1939 for (n = 0; n < sc_width * sc_height; n++)
1940 whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
1946 #endif /* MSDOS_COMPILER */
1949 * Output the "visual bell", if there is one.
1955 if (*sc_visual_bell == '\0')
1957 tputs(sc_visual_bell, sc_height, putchr);
1959 #if MSDOS_COMPILER==DJGPPC
1962 #if MSDOS_COMPILER==MSOFTC
1964 * Create a flash screen on the second video page.
1965 * Switch to that page, then switch back.
1975 #if MSDOS_COMPILER==BORLANDC
1976 unsigned short *currscreen;
1979 * Get a copy of the current screen.
1980 * Display the flash screen.
1981 * Then restore the old screen.
1985 if (whitescreen == NULL)
1987 currscreen = (unsigned short *)
1988 malloc(sc_width * sc_height * sizeof(short));
1989 if (currscreen == NULL) return;
1990 gettext(1, 1, sc_width, sc_height, currscreen);
1991 puttext(1, 1, sc_width, sc_height, whitescreen);
1993 puttext(1, 1, sc_width, sc_height, currscreen);
1996 #if MSDOS_COMPILER==WIN32C
1997 /* paint screen with an inverse color */
2000 /* leave it displayed for 100 msec. */
2003 /* restore with a redraw */
2019 putchr(CONTROL('G'));
2021 #if MSDOS_COMPILER==WIN32C
2030 * Ring the terminal bell.
2035 if (quiet == VERY_QUIET)
2048 tputs(sc_clear, sc_height, putchr);
2051 #if MSDOS_COMPILER==WIN32C
2054 _clearscreen(_GCLEARSCREEN);
2060 * Clear from the cursor to the end of the cursor's line.
2061 * {{ This must not move the cursor. }}
2067 tputs(sc_eol_clear, 1, putchr);
2069 #if MSDOS_COMPILER==MSOFTC
2072 struct rccoord tpos;
2076 * Save current state.
2078 tpos = _gettextposition();
2079 _gettextwindow(&top, &left, &bot, &right);
2081 * Set a temporary window to the current line,
2082 * from the cursor's position to the right edge of the screen.
2083 * Then clear that window.
2085 _settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
2086 _clearscreen(_GWINDOW);
2090 _settextwindow(top, left, bot, right);
2091 _settextposition(tpos.row, tpos.col);
2093 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2097 #if MSDOS_COMPILER==WIN32C
2100 CONSOLE_SCREEN_BUFFER_INFO scr;
2103 memset(&scr, 0, sizeof(scr));
2104 GetConsoleScreenBufferInfo(con_out, &scr);
2105 cpos.X = scr.dwCursorPosition.X;
2106 cpos.Y = scr.dwCursorPosition.Y;
2107 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
2108 FillConsoleOutputAttribute(con_out, curr_attr,
2109 scr.dwSize.X - cpos.X, cpos, &nchars);
2110 FillConsoleOutputCharacter(con_out, ' ',
2111 scr.dwSize.X - cpos.X, cpos, &nchars);
2119 * Clear the current line.
2120 * Clear the screen if there's off-screen memory below the display.
2129 tputs(sc_eos_clear, 1, putchr);
2131 tputs(sc_eol_clear, 1, putchr);
2136 * Clear the bottom line of the display.
2137 * Leave the cursor at the beginning of the bottom line.
2143 * If we're in a non-normal attribute mode, temporarily exit
2144 * the mode while we do the clear. Some terminals fill the
2145 * cleared area with the current attribute.
2152 if (attrmode == AT_NORMAL)
2156 int saved_attrmode = attrmode;
2160 at_enter(saved_attrmode);
2168 attr = apply_at_specials(attr);
2171 /* The one with the most priority is last. */
2172 if (attr & AT_UNDERLINE)
2173 tputs(sc_u_in, 1, putchr);
2175 tputs(sc_b_in, 1, putchr);
2176 if (attr & AT_BLINK)
2177 tputs(sc_bl_in, 1, putchr);
2178 if (attr & AT_STANDOUT)
2179 tputs(sc_s_in, 1, putchr);
2182 /* The one with the most priority is first. */
2183 if (attr & AT_STANDOUT)
2185 SETCOLORS(so_fg_color, so_bg_color);
2186 } else if (attr & AT_BLINK)
2188 SETCOLORS(bl_fg_color, bl_bg_color);
2190 else if (attr & AT_BOLD)
2192 SETCOLORS(bo_fg_color, bo_bg_color);
2194 else if (attr & AT_UNDERLINE)
2196 SETCOLORS(ul_fg_color, ul_bg_color);
2207 /* Undo things in the reverse order we did them. */
2208 if (attrmode & AT_STANDOUT)
2209 tputs(sc_s_out, 1, putchr);
2210 if (attrmode & AT_BLINK)
2211 tputs(sc_bl_out, 1, putchr);
2212 if (attrmode & AT_BOLD)
2213 tputs(sc_b_out, 1, putchr);
2214 if (attrmode & AT_UNDERLINE)
2215 tputs(sc_u_out, 1, putchr);
2218 SETCOLORS(nm_fg_color, nm_bg_color);
2221 attrmode = AT_NORMAL;
2228 int new_attrmode = apply_at_specials(attr);
2229 int ignore_modes = AT_ANSI;
2231 if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
2239 is_at_equiv(attr1, attr2)
2243 attr1 = apply_at_specials(attr1);
2244 attr2 = apply_at_specials(attr2);
2246 return (attr1 == attr2);
2250 apply_at_specials(attr)
2253 if (attr & AT_BINARY)
2255 if (attr & AT_HILITE)
2256 attr |= AT_STANDOUT;
2257 attr &= ~(AT_BINARY|AT_HILITE);
2262 #if 0 /* No longer used */
2264 * Erase the character to the left of the cursor
2265 * and move the cursor left.
2272 * Erase the previous character by overstriking with a space.
2274 tputs(sc_backspace, 1, putchr);
2276 tputs(sc_backspace, 1, putchr);
2278 #if MSDOS_COMPILER==MSOFTC
2279 struct rccoord tpos;
2282 tpos = _gettextposition();
2285 _settextposition(tpos.row, tpos.col-1);
2287 _settextposition(tpos.row, tpos.col-1);
2289 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2292 #if MSDOS_COMPILER==WIN32C
2295 CONSOLE_SCREEN_BUFFER_INFO scr;
2298 GetConsoleScreenBufferInfo(con_out, &scr);
2299 cpos = scr.dwCursorPosition;
2303 SetConsoleCursorPosition(con_out, cpos);
2304 FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
2305 SetConsoleCursorPosition(con_out, cpos);
2314 * Output a plain backspace, without erasing the previous char.
2320 tputs(sc_backspace, 1, putchr);
2326 #if MSDOS_COMPILER==MSOFTC
2327 struct rccoord tpos;
2328 tpos = _gettextposition();
2332 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2336 #if MSDOS_COMPILER==WIN32C
2337 CONSOLE_SCREEN_BUFFER_INFO scr;
2338 GetConsoleScreenBufferInfo(con_out, &scr);
2339 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
2340 col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
2347 _settextposition(row, col-1);
2348 #endif /* MSDOS_COMPILER */
2351 #if MSDOS_COMPILER==WIN32C
2353 * Determine whether an input character is waiting to be read.
2365 currentKey.ascii = 0;
2366 currentKey.scan = 0;
2369 * Wait for a real key-down event, but
2370 * ignore SHIFT and CONTROL key events.
2374 PeekConsoleInput(tty, &ip, 1, &read);
2377 ReadConsoleInput(tty, &ip, 1, &read);
2378 } while (ip.EventType != KEY_EVENT ||
2379 ip.Event.KeyEvent.bKeyDown != TRUE ||
2380 ip.Event.KeyEvent.wVirtualScanCode == 0 ||
2381 ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
2382 ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
2383 ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
2385 currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
2386 currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
2387 keyCount = ip.Event.KeyEvent.wRepeatCount;
2389 if (ip.Event.KeyEvent.dwControlKeyState &
2390 (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
2392 switch (currentKey.scan)
2394 case PCK_ALT_E: /* letter 'E' */
2395 currentKey.ascii = 0;
2398 } else if (ip.Event.KeyEvent.dwControlKeyState &
2399 (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
2401 switch (currentKey.scan)
2403 case PCK_RIGHT: /* right arrow */
2404 currentKey.scan = PCK_CTL_RIGHT;
2406 case PCK_LEFT: /* left arrow */
2407 currentKey.scan = PCK_CTL_LEFT;
2409 case PCK_DELETE: /* delete */
2410 currentKey.scan = PCK_CTL_DELETE;
2418 * Read a character from the keyboard.
2426 if (pending_scancode)
2428 pending_scancode = 0;
2429 return ((char)(currentKey.scan & 0x00FF));
2432 while (win32_kbhit((HANDLE)tty) == FALSE)
2440 ascii = currentKey.ascii;
2442 * On PC's, the extended keys return a 2 byte sequence beginning
2443 * with '00', so if the ascii code is 00, the next byte will be
2444 * the lsb of the scan code.
2446 pending_scancode = (ascii == 0x00);
2447 return ((char)ascii);