3 * Copyright (C) 1984-2011 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 no_keypad;
234 extern int screen_trashed;
236 extern int top_scroll;
239 extern int hilite_search;
242 extern char *tgetstr();
243 extern char *tgoto();
247 * Change terminal to "raw mode", or restore to "normal" mode.
249 * 1. An outstanding read will complete on receipt of a single keystroke.
250 * 2. Input is not echoed.
251 * 3. On output, \n is mapped to \r\n.
252 * 4. \t is NOT expanded into spaces.
253 * 5. Signal-causing characters such as ctrl-C (interrupt),
254 * etc. are NOT disabled.
255 * It doesn't matter whether an input \n is mapped to \r, or vice versa.
261 static int curr_on = 0;
265 erase2_char = '\b'; /* in case OS doesn't know about erase2 */
266 #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
269 static struct termios save_term;
270 static int saved_term = 0;
275 * Get terminal modes.
280 * Save modes and set certain variables dependent on modes.
288 switch (cfgetospeed(&s))
291 case B0: ospeed = 0; break;
294 case B50: ospeed = 1; break;
297 case B75: ospeed = 2; break;
300 case B110: ospeed = 3; break;
303 case B134: ospeed = 4; break;
306 case B150: ospeed = 5; break;
309 case B200: ospeed = 6; break;
312 case B300: ospeed = 7; break;
315 case B600: ospeed = 8; break;
318 case B1200: ospeed = 9; break;
321 case B1800: ospeed = 10; break;
324 case B2400: ospeed = 11; break;
327 case B4800: ospeed = 12; break;
330 case B9600: ospeed = 13; break;
333 case EXTA: ospeed = 14; break;
336 case EXTB: ospeed = 15; break;
339 case B57600: ospeed = 16; break;
342 case B115200: ospeed = 17; break;
347 erase_char = s.c_cc[VERASE];
349 erase2_char = s.c_cc[VERASE2];
351 kill_char = s.c_cc[VKILL];
353 werase_char = s.c_cc[VWERASE];
355 werase_char = CONTROL('W');
359 * Set the modes to the way we want them.
421 #if MUST_SET_LINE_DISCIPLINE
423 * System's termios is broken; need to explicitly
424 * request TERMIODISC line discipline.
426 s.c_line = TERMIODISC;
431 * Restore saved modes.
438 tcsetattr(tty, TCSADRAIN, &s);
439 #if MUST_SET_LINE_DISCIPLINE
443 * Broken termios *ignores* any line discipline
444 * except TERMIODISC. A different old line discipline
445 * is therefore not restored, yet. Restore the old
446 * line discipline by hand.
448 ioctl(tty, TIOCSETD, &save_term.c_line);
456 static struct termio save_term;
457 static int saved_term = 0;
462 * Get terminal modes.
464 ioctl(tty, TCGETA, &s);
467 * Save modes and set certain variables dependent on modes.
475 ospeed = s.c_cflag & CBAUD;
477 erase_char = s.c_cc[VERASE];
478 kill_char = s.c_cc[VKILL];
480 werase_char = s.c_cc[VWERASE];
482 werase_char = CONTROL('W');
486 * Set the modes to the way we want them.
488 s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL);
489 s.c_oflag |= (OPOST|ONLCR|TAB3);
490 s.c_oflag &= ~(OCRNL|ONOCR|ONLRET);
496 * Restore saved modes.
500 ioctl(tty, TCSETAW, &s);
506 static struct sgttyb save_term;
507 static int saved_term = 0;
512 * Get terminal modes.
514 ioctl(tty, TIOCGETP, &s);
517 * Save modes and set certain variables dependent on modes.
525 ospeed = s.sg_ospeed;
527 erase_char = s.sg_erase;
528 kill_char = s.sg_kill;
529 werase_char = CONTROL('W');
532 * Set the modes to the way we want them.
534 s.sg_flags |= CBREAK;
535 s.sg_flags &= ~(ECHO|XTABS);
539 * Restore saved modes.
543 ioctl(tty, TIOCSETN, &s);
549 static struct sgbuf save_term;
550 static int saved_term = 0;
555 * Get terminal modes.
560 * Save modes and set certain variables dependent on modes.
567 erase_char = s.sg_bspch;
568 kill_char = s.sg_dlnch;
569 werase_char = CONTROL('W');
572 * Set the modes to the way we want them.
581 * Restore saved modes.
588 /* MS-DOS, Windows, or OS2 */
591 LSIGNAL(SIGINT, SIG_IGN);
594 #if MSDOS_COMPILER==DJGPPC
595 kill_char = CONTROL('U');
597 * So that when we shell out or run another program, its
598 * stdin is in cooked mode. We do not switch stdin to binary
599 * mode if fd0 is zero, since that means we were called before
600 * tty was reopened in open_getchr, in which case we would be
601 * changing the original stdin device outside less.
604 setmode(0, on ? O_BINARY : O_TEXT);
608 werase_char = CONTROL('W');
618 * Some glue to prevent calling termcap functions if tgetent() failed.
629 s = lgetenv("LESS_TERMCAP_DEBUG");
630 if (s != NULL && *s != '\0')
632 struct env { struct env *next; char *name; char *value; };
633 static struct env *envs = NULL;
635 for (p = envs; p != NULL; p = p->next)
636 if (strcmp(p->name, capname) == 0)
638 p = (struct env *) ecalloc(1, sizeof(struct env));
639 p->name = save(capname);
640 p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
641 sprintf(p->value, "<%s>", capname);
646 strcpy(name, "LESS_TERMCAP_");
647 strcat(name, capname);
648 return (lgetenv(name));
657 if ((s = ltget_env(capname)) != NULL)
658 return (*s != '\0' && *s != '0');
661 return (tgetflag(capname));
670 if ((s = ltget_env(capname)) != NULL)
674 return (tgetnum(capname));
678 ltgetstr(capname, pp)
684 if ((s = ltget_env(capname)) != NULL)
688 return (tgetstr(capname, pp));
690 #endif /* MSDOS_COMPILER */
693 * Get size of the output screen.
705 #define DEF_SC_WIDTH 80
707 #define DEF_SC_HEIGHT 25
709 #define DEF_SC_HEIGHT 24
713 sys_width = sys_height = 0;
715 #if MSDOS_COMPILER==MSOFTC
717 struct videoconfig w;
719 sys_height = w.numtextrows;
720 sys_width = w.numtextcols;
723 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
727 sys_height = w.screenheight;
728 sys_width = w.screenwidth;
731 #if MSDOS_COMPILER==WIN32C
733 CONSOLE_SCREEN_BUFFER_INFO scr;
734 GetConsoleScreenBufferInfo(con_out, &scr);
735 sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
736 sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
746 * When using terminal emulators for XFree86/OS2, the
747 * _scrsize function does not work well.
748 * Call the scrsize.exe program to get the window size.
750 windowid = getenv("WINDOWID");
751 if (windowid != NULL)
753 FILE *fd = popen("scrsize", "rt");
757 fscanf(fd, "%i %i", &w, &h);
771 if (ioctl(2, TIOCGWINSZ, &w) == 0)
774 sys_height = w.ws_row;
776 sys_width = w.ws_col;
783 if (ioctl(2, WIOCGETD, &w) == 0)
786 sys_height = w.uw_height / w.uw_vs;
788 sys_width = w.uw_width / w.uw_hs;
799 sc_height = sys_height;
800 else if ((s = lgetenv("LINES")) != NULL)
803 else if ((n = ltgetnum("li")) > 0)
807 sc_height = DEF_SC_HEIGHT;
810 sc_width = sys_width;
811 else if ((s = lgetenv("COLUMNS")) != NULL)
814 else if ((n = ltgetnum("co")) > 0)
818 sc_width = DEF_SC_WIDTH;
821 #if MSDOS_COMPILER==MSOFTC
823 * Figure out how many empty loops it takes to delay a millisecond.
831 * Get synchronized at the start of a tick.
834 while (clock() == start)
837 * Now count loops till the next tick.
841 while (clock() == start)
844 * Convert from (loops per clock) to (loops per millisecond).
846 msec_loops *= CLOCKS_PER_SEC;
851 * Delay for a specified number of milliseconds.
856 static long delay_dummy = 0;
868 for (i = 0; i < msec_loops; i++)
871 * Make it look like we're doing something here,
872 * so the optimizer doesn't remove the whole loop.
881 * Return the characters actually input by a "special" key.
887 static char tbuf[40];
889 #if MSDOS_COMPILER || OS2
890 static char k_right[] = { '\340', PCK_RIGHT, 0 };
891 static char k_left[] = { '\340', PCK_LEFT, 0 };
892 static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 };
893 static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 };
894 static char k_insert[] = { '\340', PCK_INSERT, 0 };
895 static char k_delete[] = { '\340', PCK_DELETE, 0 };
896 static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 };
897 static char k_ctl_backspace[] = { '\177', 0 };
898 static char k_home[] = { '\340', PCK_HOME, 0 };
899 static char k_end[] = { '\340', PCK_END, 0 };
900 static char k_up[] = { '\340', PCK_UP, 0 };
901 static char k_down[] = { '\340', PCK_DOWN, 0 };
902 static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 };
903 static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 };
904 static char k_pageup[] = { '\340', PCK_PAGEUP, 0 };
905 static char k_f1[] = { '\340', PCK_F1, 0 };
915 * If windowid is not NULL, assume less is executed in
916 * the XFree86 environment.
919 s = windowid ? ltgetstr("kr", &sp) : k_right;
922 s = windowid ? ltgetstr("kl", &sp) : k_left;
925 s = windowid ? ltgetstr("ku", &sp) : k_up;
928 s = windowid ? ltgetstr("kd", &sp) : k_down;
931 s = windowid ? ltgetstr("kP", &sp) : k_pageup;
934 s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
937 s = windowid ? ltgetstr("kh", &sp) : k_home;
940 s = windowid ? ltgetstr("@7", &sp) : k_end;
945 s = ltgetstr("kD", &sp);
985 #if MSDOS_COMPILER || OS2
989 case SK_CTL_LEFT_ARROW:
992 case SK_CTL_RIGHT_ARROW:
995 case SK_CTL_BACKSPACE:
1008 case SK_RIGHT_ARROW:
1009 s = ltgetstr("kr", &sp);
1012 s = ltgetstr("kl", &sp);
1015 s = ltgetstr("ku", &sp);
1018 s = ltgetstr("kd", &sp);
1021 s = ltgetstr("kP", &sp);
1024 s = ltgetstr("kN", &sp);
1027 s = ltgetstr("kh", &sp);
1030 s = ltgetstr("@7", &sp);
1033 s = ltgetstr("kD", &sp);
1043 tbuf[0] = CONTROL('K');
1054 * Get terminal capabilities via termcap.
1065 * Set up default colors.
1066 * The xx_s_width and xx_e_width vars are already initialized to 0.
1068 #if MSDOS_COMPILER==MSOFTC
1069 sy_bg_color = _getbkcolor();
1070 sy_fg_color = _gettextcolor();
1073 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1077 sy_bg_color = (w.attribute >> 4) & 0x0F;
1078 sy_fg_color = (w.attribute >> 0) & 0x0F;
1081 #if MSDOS_COMPILER==WIN32C
1084 CONSOLE_SCREEN_BUFFER_INFO scr;
1086 con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
1088 * Always open stdin in binary. Note this *must* be done
1089 * before any file operations have been done on fd0.
1092 GetConsoleScreenBufferInfo(con_out, &scr);
1093 ReadConsoleOutputAttribute(con_out, &curr_attr,
1094 1, scr.dwCursorPosition, &nread);
1095 sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
1096 sy_fg_color = curr_attr & FG_COLORS;
1101 nm_fg_color = sy_fg_color;
1102 nm_bg_color = sy_bg_color;
1113 * Get size of the screen.
1119 #else /* !MSDOS_COMPILER */
1122 register char *t1, *t2;
1124 char termbuf[TERMBUF_SIZE];
1126 static char sbuf[TERMSBUF_SIZE];
1130 * Make sure the termcap database is available.
1132 sp = lgetenv("TERMCAP");
1133 if (sp == NULL || *sp == '\0')
1136 if ((sp = homefile("termcap.dat")) != NULL)
1138 termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
1139 sprintf(termcap, "TERMCAP=%s", sp);
1146 * Find out what kind of terminal this is.
1148 if ((term = lgetenv("TERM")) == NULL)
1149 term = DEFAULT_TERM;
1151 if (tgetent(termbuf, term) != TGETENT_OK)
1153 if (ltgetflag("hc"))
1157 * Get size of the screen.
1162 auto_wrap = ltgetflag("am");
1163 ignaw = ltgetflag("xn");
1164 above_mem = ltgetflag("da");
1165 below_mem = ltgetflag("db");
1166 clear_bg = ltgetflag("ut");
1169 * Assumes termcap variable "sg" is the printing width of:
1170 * the standout sequence, the end standout sequence,
1171 * the underline sequence, the end underline sequence,
1172 * the boldface sequence, and the end boldface sequence.
1174 if ((so_s_width = ltgetnum("sg")) < 0)
1176 so_e_width = so_s_width;
1178 bo_s_width = bo_e_width = so_s_width;
1179 ul_s_width = ul_e_width = so_s_width;
1180 bl_s_width = bl_e_width = so_s_width;
1183 if (so_s_width > 0 || so_e_width > 0)
1185 * Disable highlighting by default on magic cookie terminals.
1186 * Turning on highlighting might change the displayed width
1187 * of a line, causing the display to get messed up.
1188 * The user can turn it back on with -g,
1189 * but she won't like the results.
1195 * Get various string-valued capabilities.
1200 sc_pad = ltgetstr("pc", &sp);
1205 sc_s_keypad = ltgetstr("ks", &sp);
1206 if (sc_s_keypad == NULL)
1208 sc_e_keypad = ltgetstr("ke", &sp);
1209 if (sc_e_keypad == NULL)
1212 sc_init = ltgetstr("ti", &sp);
1213 if (sc_init == NULL)
1216 sc_deinit= ltgetstr("te", &sp);
1217 if (sc_deinit == NULL)
1220 sc_eol_clear = ltgetstr("ce", &sp);
1221 if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
1227 sc_eos_clear = ltgetstr("cd", &sp);
1228 if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
1234 sc_clear = ltgetstr("cl", &sp);
1235 if (sc_clear == NULL || *sc_clear == '\0')
1241 sc_move = ltgetstr("cm", &sp);
1242 if (sc_move == NULL || *sc_move == '\0')
1245 * This is not an error here, because we don't
1246 * always need sc_move.
1247 * We need it only if we don't have home or lower-left.
1254 tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
1255 tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
1256 tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
1257 tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);
1259 sc_visual_bell = ltgetstr("vb", &sp);
1260 if (sc_visual_bell == NULL)
1261 sc_visual_bell = "";
1263 if (ltgetflag("bs"))
1264 sc_backspace = "\b";
1267 sc_backspace = ltgetstr("bc", &sp);
1268 if (sc_backspace == NULL || *sc_backspace == '\0')
1269 sc_backspace = "\b";
1273 * Choose between using "ho" and "cm" ("home" and "cursor move")
1274 * to move the cursor to the upper left corner of the screen.
1276 t1 = ltgetstr("ho", &sp);
1279 if (*sc_move == '\0')
1283 strcpy(sp, tgoto(sc_move, 0, 0));
1285 sp += strlen(sp) + 1;
1287 sc_home = cheaper(t1, t2, "|\b^");
1290 * Choose between using "ll" and "cm" ("lower left" and "cursor move")
1291 * to move the cursor to the lower left corner of the screen.
1293 t1 = ltgetstr("ll", &sp);
1296 if (*sc_move == '\0')
1300 strcpy(sp, tgoto(sc_move, 0, sc_height-1));
1302 sp += strlen(sp) + 1;
1304 sc_lower_left = cheaper(t1, t2, "\r");
1307 * Get carriage return string.
1309 sc_return = ltgetstr("cr", &sp);
1310 if (sc_return == NULL)
1314 * Choose between using "al" or "sr" ("add line" or "scroll reverse")
1315 * to add a line at the top of the screen.
1317 t1 = ltgetstr("al", &sp);
1320 t2 = ltgetstr("sr", &sp);
1324 if (*t1 == '\0' && *t2 == '\0')
1331 sc_addline = cheaper(t1, t2, "");
1332 if (*sc_addline == '\0')
1335 * Force repaint on any backward movement.
1339 #endif /* MSDOS_COMPILER */
1344 * Return the cost of displaying a termcap string.
1345 * We use the trick of calling tputs, but as a char printing function
1346 * we give it inc_costcount, which just increments "costcount".
1347 * This tells us how many chars would be printed by using this string.
1348 * {{ Couldn't we just use strlen? }}
1350 static int costcount;
1366 tputs(t, sc_height, inc_costcount);
1371 * Return the "best" of the two given termcap strings.
1372 * The best, if both exist, is the one with the lower
1373 * cost (see cost() function).
1376 cheaper(t1, t2, def)
1380 if (*t1 == '\0' && *t2 == '\0')
1389 if (cost(t1) < cost(t2))
1395 tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
1404 *instr = ltgetstr(incap, spp);
1409 *outstr = def_outstr;
1413 *outstr = ltgetstr(outcap, spp);
1414 if (*outstr == NULL)
1415 /* No specific out capability; use "me". */
1416 *outstr = ltgetstr("me", spp);
1417 if (*outstr == NULL)
1418 /* Don't even have "me"; use a null string. */
1422 #endif /* MSDOS_COMPILER */
1426 * Below are the functions which perform all the
1427 * terminal-specific screen manipulation.
1433 #if MSDOS_COMPILER==WIN32C
1435 _settextposition(int row, int col)
1438 CONSOLE_SCREEN_BUFFER_INFO csbi;
1440 GetConsoleScreenBufferInfo(con_out, &csbi);
1441 cpos.X = csbi.srWindow.Left + (col - 1);
1442 cpos.Y = csbi.srWindow.Top + (row - 1);
1443 SetConsoleCursorPosition(con_out, cpos);
1448 * Initialize the screen to the correct color at startup.
1453 SETCOLORS(nm_fg_color, nm_bg_color);
1456 * This clears the screen at startup. This is different from
1457 * the behavior of other versions of less. Disable it for now.
1464 * Create a complete, blank screen using "normal" colors.
1466 SETCOLORS(nm_fg_color, nm_bg_color);
1467 blanks = (char *) ecalloc(width+1, sizeof(char));
1468 for (col = 0; col < sc_width; col++)
1470 blanks[sc_width] = '\0';
1471 for (row = 0; row < sc_height; row++)
1478 #if MSDOS_COMPILER==WIN32C
1481 * Termcap-like init with a private win32 console.
1486 CONSOLE_SCREEN_BUFFER_INFO scr;
1489 if (con_out_save == INVALID_HANDLE_VALUE)
1492 GetConsoleScreenBufferInfo(con_out_save, &scr);
1494 if (con_out_ours == INVALID_HANDLE_VALUE)
1497 * Create our own screen buffer, so that we
1498 * may restore the original when done.
1500 con_out_ours = CreateConsoleScreenBuffer(
1501 GENERIC_WRITE | GENERIC_READ,
1502 FILE_SHARE_WRITE | FILE_SHARE_READ,
1503 (LPSECURITY_ATTRIBUTES) NULL,
1504 CONSOLE_TEXTMODE_BUFFER,
1508 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1509 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1510 SetConsoleScreenBufferSize(con_out_ours, size);
1511 SetConsoleActiveScreenBuffer(con_out_ours);
1512 con_out = con_out_ours;
1516 * Restore the startup console.
1521 if (con_out_save == INVALID_HANDLE_VALUE)
1524 (void) CloseHandle(con_out_ours);
1525 SetConsoleActiveScreenBuffer(con_out_save);
1526 con_out = con_out_save;
1532 * Initialize terminal
1539 tputs(sc_init, sc_height, putchr);
1541 tputs(sc_s_keypad, sc_height, putchr);
1547 * This is nice to terminals with no alternate screen,
1548 * but with saved scrolled-off-the-top lines. This way,
1549 * no previous line is lost, but we start with a whole
1550 * screen to ourself.
1552 for (i = 1; i < sc_height; i++)
1557 #if MSDOS_COMPILER==WIN32C
1568 * Deinitialize terminal
1577 tputs(sc_e_keypad, sc_height, putchr);
1579 tputs(sc_deinit, sc_height, putchr);
1581 /* Restore system colors. */
1582 SETCOLORS(sy_fg_color, sy_bg_color);
1583 #if MSDOS_COMPILER==WIN32C
1585 win32_deinit_term();
1587 /* Need clreol to make SETCOLORS take effect. */
1595 * Home cursor (move to upper left corner of screen).
1601 tputs(sc_home, 1, putchr);
1604 _settextposition(1,1);
1609 * Add a blank line (called with cursor at home).
1610 * Should scroll the display down.
1616 tputs(sc_addline, sc_height, putchr);
1619 #if MSDOS_COMPILER==MSOFTC
1620 _scrolltextwindow(_GSCROLLDOWN);
1621 _settextposition(1,1);
1623 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1624 movetext(1,1, sc_width,sc_height-1, 1,2);
1628 #if MSDOS_COMPILER==WIN32C
1631 SMALL_RECT rcSrc, rcClip;
1633 CONSOLE_SCREEN_BUFFER_INFO csbi;
1635 GetConsoleScreenBufferInfo(con_out,&csbi);
1637 /* The clip rectangle is the entire visible screen. */
1638 rcClip.Left = csbi.srWindow.Left;
1639 rcClip.Top = csbi.srWindow.Top;
1640 rcClip.Right = csbi.srWindow.Right;
1641 rcClip.Bottom = csbi.srWindow.Bottom;
1643 /* The source rectangle is the visible screen minus the last line. */
1647 /* Move the top left corner of the source window down one row. */
1648 new_org.X = rcSrc.Left;
1649 new_org.Y = rcSrc.Top + 1;
1651 /* Fill the right character and attributes. */
1652 fillchar.Char.AsciiChar = ' ';
1653 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1654 fillchar.Attributes = curr_attr;
1655 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1656 _settextposition(1,1);
1666 * Remove the n topmost lines and scroll everything below it in the
1667 * window upward. This is needed to stop leaking the topmost line
1668 * into the scrollback buffer when we go down-one-line (in WIN32).
1674 #if MSDOS_COMPILER==WIN32C
1675 SMALL_RECT rcSrc, rcClip;
1678 CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
1680 if (n >= sc_height - 1)
1689 GetConsoleScreenBufferInfo(con_out, &csbi);
1691 /* Get the extent of all-visible-rows-but-the-last. */
1692 rcSrc.Left = csbi.srWindow.Left;
1693 rcSrc.Top = csbi.srWindow.Top + n;
1694 rcSrc.Right = csbi.srWindow.Right;
1695 rcSrc.Bottom = csbi.srWindow.Bottom;
1697 /* Get the clip rectangle. */
1698 rcClip.Left = rcSrc.Left;
1699 rcClip.Top = csbi.srWindow.Top;
1700 rcClip.Right = rcSrc.Right;
1701 rcClip.Bottom = rcSrc.Bottom ;
1703 /* Move the source window up n rows. */
1704 new_org.X = rcSrc.Left;
1705 new_org.Y = rcSrc.Top - n;
1707 /* Fill the right character and attributes. */
1708 fillchar.Char.AsciiChar = ' ';
1709 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1710 fillchar.Attributes = curr_attr;
1712 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1714 /* Position cursor on first blank line. */
1715 goto_line(sc_height - n - 1);
1720 #if MSDOS_COMPILER==WIN32C
1728 * This will clear only the currently visible rows of the NT
1729 * console buffer, which means none of the precious scrollback
1730 * rows are touched making for faster scrolling. Note that, if
1731 * the window has fewer columns than the console buffer (i.e.
1732 * there is a horizontal scrollbar as well), the entire width
1733 * of the visible rows will be cleared.
1738 CONSOLE_SCREEN_BUFFER_INFO csbi;
1740 /* get the number of cells in the current buffer */
1741 GetConsoleScreenBufferInfo(con_out, &csbi);
1742 winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
1744 topleft.Y = csbi.srWindow.Top;
1746 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1747 FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
1748 FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
1752 * Remove the n topmost lines and scroll everything below it in the
1759 SMALL_RECT rcSrc, rcClip;
1765 CONSOLE_SCREEN_BUFFER_INFO csbi;
1770 if (n >= sc_height - 1)
1773 _settextposition(1,1);
1777 /* Get the extent of what will remain visible after scrolling. */
1778 GetConsoleScreenBufferInfo(con_out, &csbi);
1779 rcSrc.Left = csbi.srWindow.Left;
1780 rcSrc.Top = csbi.srWindow.Top + n;
1781 rcSrc.Right = csbi.srWindow.Right;
1782 rcSrc.Bottom = csbi.srWindow.Bottom;
1784 /* Get the clip rectangle. */
1785 rcClip.Left = rcSrc.Left;
1786 rcClip.Top = csbi.srWindow.Top;
1787 rcClip.Right = rcSrc.Right;
1788 rcClip.Bottom = rcSrc.Bottom ;
1790 /* Move the source text to the top of the screen. */
1791 new_org.X = rcSrc.Left;
1792 new_org.Y = rcClip.Top;
1794 /* Fill the right character and attributes. */
1795 fillchar.Char.AsciiChar = ' ';
1796 fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);
1798 /* Scroll the window. */
1799 SetConsoleTextAttribute(con_out, fillchar.Attributes);
1800 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1802 /* Clear remaining lines at bottom. */
1803 topleft.X = csbi.dwCursorPosition.X;
1804 topleft.Y = rcSrc.Bottom - n;
1805 size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
1806 FillConsoleOutputCharacter(con_out, ' ', size, topleft,
1808 FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
1810 SetConsoleTextAttribute(con_out, curr_attr);
1812 /* Move cursor n lines up from where it was. */
1813 csbi.dwCursorPosition.Y -= n;
1814 SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
1819 * Move cursor to lower left corner of screen.
1825 tputs(sc_lower_left, 1, putchr);
1828 _settextposition(sc_height, 1);
1833 * Move cursor to left position of current line.
1839 tputs(sc_return, 1, putchr);
1843 #if MSDOS_COMPILER==WIN32C
1845 CONSOLE_SCREEN_BUFFER_INFO scr;
1846 GetConsoleScreenBufferInfo(con_out, &scr);
1847 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
1850 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1854 struct rccoord tpos = _gettextposition();
1859 _settextposition(row, 1);
1864 * Check if the console size has changed and reset internals
1865 * (in lieu of SIGWINCH for WIN32).
1870 #if MSDOS_COMPILER==WIN32C
1871 CONSOLE_SCREEN_BUFFER_INFO scr;
1874 if (con_out == INVALID_HANDLE_VALUE)
1878 GetConsoleScreenBufferInfo(con_out, &scr);
1879 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1880 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1881 if (size.Y != sc_height || size.X != sc_width)
1885 if (!no_init && con_out_ours == con_out)
1886 SetConsoleScreenBufferSize(con_out, size);
1888 wscroll = (sc_height + 1) / 2;
1895 * Goto a specific line on the screen.
1902 tputs(tgoto(sc_move, 0, slinenum), 1, putchr);
1905 _settextposition(slinenum+1, 1);
1909 #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
1911 * Create an alternate screen which is all white.
1912 * This screen is used to create a "flash" effect, by displaying it
1913 * briefly and then switching back to the normal screen.
1914 * {{ Yuck! There must be a better way to get a visual bell. }}
1919 #if MSDOS_COMPILER==MSOFTC
1920 struct videoconfig w;
1924 _getvideoconfig(&w);
1925 videopages = w.numvideopages;
1928 at_enter(AT_STANDOUT);
1933 at_enter(AT_STANDOUT);
1934 blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
1935 for (col = 0; col < w.numtextcols; col++)
1937 for (row = w.numtextrows; row > 0; row--)
1938 _outmem(blanks, w.numtextcols);
1945 #if MSDOS_COMPILER==BORLANDC
1948 whitescreen = (unsigned short *)
1949 malloc(sc_width * sc_height * sizeof(short));
1950 if (whitescreen == NULL)
1952 for (n = 0; n < sc_width * sc_height; n++)
1953 whitescreen[n] = 0x7020;
1955 #if MSDOS_COMPILER==WIN32C
1958 whitescreen = (WORD *)
1959 malloc(sc_height * sc_width * sizeof(WORD));
1960 if (whitescreen == NULL)
1962 /* Invert the standard colors. */
1963 for (n = 0; n < sc_width * sc_height; n++)
1964 whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
1970 #endif /* MSDOS_COMPILER */
1973 * Output the "visual bell", if there is one.
1979 if (*sc_visual_bell == '\0')
1981 tputs(sc_visual_bell, sc_height, putchr);
1983 #if MSDOS_COMPILER==DJGPPC
1986 #if MSDOS_COMPILER==MSOFTC
1988 * Create a flash screen on the second video page.
1989 * Switch to that page, then switch back.
1999 #if MSDOS_COMPILER==BORLANDC
2000 unsigned short *currscreen;
2003 * Get a copy of the current screen.
2004 * Display the flash screen.
2005 * Then restore the old screen.
2009 if (whitescreen == NULL)
2011 currscreen = (unsigned short *)
2012 malloc(sc_width * sc_height * sizeof(short));
2013 if (currscreen == NULL) return;
2014 gettext(1, 1, sc_width, sc_height, currscreen);
2015 puttext(1, 1, sc_width, sc_height, whitescreen);
2017 puttext(1, 1, sc_width, sc_height, currscreen);
2020 #if MSDOS_COMPILER==WIN32C
2021 /* paint screen with an inverse color */
2024 /* leave it displayed for 100 msec. */
2027 /* restore with a redraw */
2043 putchr(CONTROL('G'));
2045 #if MSDOS_COMPILER==WIN32C
2054 * Ring the terminal bell.
2059 if (quiet == VERY_QUIET)
2072 tputs(sc_clear, sc_height, putchr);
2075 #if MSDOS_COMPILER==WIN32C
2078 _clearscreen(_GCLEARSCREEN);
2084 * Clear from the cursor to the end of the cursor's line.
2085 * {{ This must not move the cursor. }}
2091 tputs(sc_eol_clear, 1, putchr);
2093 #if MSDOS_COMPILER==MSOFTC
2096 struct rccoord tpos;
2100 * Save current state.
2102 tpos = _gettextposition();
2103 _gettextwindow(&top, &left, &bot, &right);
2105 * Set a temporary window to the current line,
2106 * from the cursor's position to the right edge of the screen.
2107 * Then clear that window.
2109 _settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
2110 _clearscreen(_GWINDOW);
2114 _settextwindow(top, left, bot, right);
2115 _settextposition(tpos.row, tpos.col);
2117 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2121 #if MSDOS_COMPILER==WIN32C
2124 CONSOLE_SCREEN_BUFFER_INFO scr;
2127 memset(&scr, 0, sizeof(scr));
2128 GetConsoleScreenBufferInfo(con_out, &scr);
2129 cpos.X = scr.dwCursorPosition.X;
2130 cpos.Y = scr.dwCursorPosition.Y;
2131 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
2132 FillConsoleOutputAttribute(con_out, curr_attr,
2133 scr.dwSize.X - cpos.X, cpos, &nchars);
2134 FillConsoleOutputCharacter(con_out, ' ',
2135 scr.dwSize.X - cpos.X, cpos, &nchars);
2143 * Clear the current line.
2144 * Clear the screen if there's off-screen memory below the display.
2153 tputs(sc_eos_clear, 1, putchr);
2155 tputs(sc_eol_clear, 1, putchr);
2160 * Clear the bottom line of the display.
2161 * Leave the cursor at the beginning of the bottom line.
2167 * If we're in a non-normal attribute mode, temporarily exit
2168 * the mode while we do the clear. Some terminals fill the
2169 * cleared area with the current attribute.
2176 if (attrmode == AT_NORMAL)
2180 int saved_attrmode = attrmode;
2184 at_enter(saved_attrmode);
2192 attr = apply_at_specials(attr);
2195 /* The one with the most priority is last. */
2196 if (attr & AT_UNDERLINE)
2197 tputs(sc_u_in, 1, putchr);
2199 tputs(sc_b_in, 1, putchr);
2200 if (attr & AT_BLINK)
2201 tputs(sc_bl_in, 1, putchr);
2202 if (attr & AT_STANDOUT)
2203 tputs(sc_s_in, 1, putchr);
2206 /* The one with the most priority is first. */
2207 if (attr & AT_STANDOUT)
2209 SETCOLORS(so_fg_color, so_bg_color);
2210 } else if (attr & AT_BLINK)
2212 SETCOLORS(bl_fg_color, bl_bg_color);
2214 else if (attr & AT_BOLD)
2216 SETCOLORS(bo_fg_color, bo_bg_color);
2218 else if (attr & AT_UNDERLINE)
2220 SETCOLORS(ul_fg_color, ul_bg_color);
2231 /* Undo things in the reverse order we did them. */
2232 if (attrmode & AT_STANDOUT)
2233 tputs(sc_s_out, 1, putchr);
2234 if (attrmode & AT_BLINK)
2235 tputs(sc_bl_out, 1, putchr);
2236 if (attrmode & AT_BOLD)
2237 tputs(sc_b_out, 1, putchr);
2238 if (attrmode & AT_UNDERLINE)
2239 tputs(sc_u_out, 1, putchr);
2242 SETCOLORS(nm_fg_color, nm_bg_color);
2245 attrmode = AT_NORMAL;
2252 int new_attrmode = apply_at_specials(attr);
2253 int ignore_modes = AT_ANSI;
2255 if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
2263 is_at_equiv(attr1, attr2)
2267 attr1 = apply_at_specials(attr1);
2268 attr2 = apply_at_specials(attr2);
2270 return (attr1 == attr2);
2274 apply_at_specials(attr)
2277 if (attr & AT_BINARY)
2279 if (attr & AT_HILITE)
2280 attr |= AT_STANDOUT;
2281 attr &= ~(AT_BINARY|AT_HILITE);
2286 #if 0 /* No longer used */
2288 * Erase the character to the left of the cursor
2289 * and move the cursor left.
2296 * Erase the previous character by overstriking with a space.
2298 tputs(sc_backspace, 1, putchr);
2300 tputs(sc_backspace, 1, putchr);
2302 #if MSDOS_COMPILER==MSOFTC
2303 struct rccoord tpos;
2306 tpos = _gettextposition();
2309 _settextposition(tpos.row, tpos.col-1);
2311 _settextposition(tpos.row, tpos.col-1);
2313 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2316 #if MSDOS_COMPILER==WIN32C
2319 CONSOLE_SCREEN_BUFFER_INFO scr;
2322 GetConsoleScreenBufferInfo(con_out, &scr);
2323 cpos = scr.dwCursorPosition;
2327 SetConsoleCursorPosition(con_out, cpos);
2328 FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
2329 SetConsoleCursorPosition(con_out, cpos);
2338 * Output a plain backspace, without erasing the previous char.
2344 tputs(sc_backspace, 1, putchr);
2350 #if MSDOS_COMPILER==MSOFTC
2351 struct rccoord tpos;
2352 tpos = _gettextposition();
2356 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2360 #if MSDOS_COMPILER==WIN32C
2361 CONSOLE_SCREEN_BUFFER_INFO scr;
2362 GetConsoleScreenBufferInfo(con_out, &scr);
2363 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
2364 col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
2371 _settextposition(row, col-1);
2372 #endif /* MSDOS_COMPILER */
2375 #if MSDOS_COMPILER==WIN32C
2377 * Determine whether an input character is waiting to be read.
2389 currentKey.ascii = 0;
2390 currentKey.scan = 0;
2393 * Wait for a real key-down event, but
2394 * ignore SHIFT and CONTROL key events.
2398 PeekConsoleInput(tty, &ip, 1, &read);
2401 ReadConsoleInput(tty, &ip, 1, &read);
2402 } while (ip.EventType != KEY_EVENT ||
2403 ip.Event.KeyEvent.bKeyDown != TRUE ||
2404 ip.Event.KeyEvent.wVirtualScanCode == 0 ||
2405 ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
2406 ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
2407 ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
2409 currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
2410 currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
2411 keyCount = ip.Event.KeyEvent.wRepeatCount;
2413 if (ip.Event.KeyEvent.dwControlKeyState &
2414 (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
2416 switch (currentKey.scan)
2418 case PCK_ALT_E: /* letter 'E' */
2419 currentKey.ascii = 0;
2422 } else if (ip.Event.KeyEvent.dwControlKeyState &
2423 (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
2425 switch (currentKey.scan)
2427 case PCK_RIGHT: /* right arrow */
2428 currentKey.scan = PCK_CTL_RIGHT;
2430 case PCK_LEFT: /* left arrow */
2431 currentKey.scan = PCK_CTL_LEFT;
2433 case PCK_DELETE: /* delete */
2434 currentKey.scan = PCK_CTL_DELETE;
2442 * Read a character from the keyboard.
2450 if (pending_scancode)
2452 pending_scancode = 0;
2453 return ((char)(currentKey.scan & 0x00FF));
2456 while (win32_kbhit((HANDLE)tty) == FALSE)
2464 ascii = currentKey.ascii;
2466 * On PC's, the extended keys return a 2 byte sequence beginning
2467 * with '00', so if the ascii code is 00, the next byte will be
2468 * the lsb of the scan code.
2470 pending_scancode = (ascii == 0x00);
2471 return ((char)ascii);
2479 WIN32setcolors(fg, bg)
2489 WIN32textout(text, len)
2493 #if MSDOS_COMPILER==WIN32C
2495 WriteConsole(con_out, text, len, &written, NULL);