2 * Copyright (C) 1984-2011 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.
628 s = lgetenv("LESS_TERMCAP_DEBUG");
629 if (s != NULL && *s != '\0')
631 struct env { struct env *next; char *name; char *value; };
632 static struct env *envs = NULL;
634 for (p = envs; p != NULL; p = p->next)
635 if (strcmp(p->name, capname) == 0)
637 p = (struct env *) ecalloc(1, sizeof(struct env));
638 p->name = save(capname);
639 p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
640 sprintf(p->value, "<%s>", capname);
645 strcpy(name, "LESS_TERMCAP_");
646 strcat(name, capname);
647 return (lgetenv(name));
656 if ((s = ltget_env(capname)) != NULL)
657 return (*s != '\0' && *s != '0');
660 return (tgetflag(capname));
669 if ((s = ltget_env(capname)) != NULL)
673 return (tgetnum(capname));
677 ltgetstr(capname, pp)
683 if ((s = ltget_env(capname)) != NULL)
687 return (tgetstr(capname, pp));
689 #endif /* MSDOS_COMPILER */
692 * Get size of the output screen.
704 #define DEF_SC_WIDTH 80
706 #define DEF_SC_HEIGHT 25
708 #define DEF_SC_HEIGHT 24
712 sys_width = sys_height = 0;
714 #if MSDOS_COMPILER==MSOFTC
716 struct videoconfig w;
718 sys_height = w.numtextrows;
719 sys_width = w.numtextcols;
722 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
726 sys_height = w.screenheight;
727 sys_width = w.screenwidth;
730 #if MSDOS_COMPILER==WIN32C
732 CONSOLE_SCREEN_BUFFER_INFO scr;
733 GetConsoleScreenBufferInfo(con_out, &scr);
734 sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
735 sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
745 * When using terminal emulators for XFree86/OS2, the
746 * _scrsize function does not work well.
747 * Call the scrsize.exe program to get the window size.
749 windowid = getenv("WINDOWID");
750 if (windowid != NULL)
752 FILE *fd = popen("scrsize", "rt");
756 fscanf(fd, "%i %i", &w, &h);
770 if (ioctl(2, TIOCGWINSZ, &w) == 0)
773 sys_height = w.ws_row;
775 sys_width = w.ws_col;
782 if (ioctl(2, WIOCGETD, &w) == 0)
785 sys_height = w.uw_height / w.uw_vs;
787 sys_width = w.uw_width / w.uw_hs;
798 sc_height = sys_height;
799 else if ((s = lgetenv("LINES")) != NULL)
802 else if ((n = ltgetnum("li")) > 0)
806 sc_height = DEF_SC_HEIGHT;
809 sc_width = sys_width;
810 else if ((s = lgetenv("COLUMNS")) != NULL)
813 else if ((n = ltgetnum("co")) > 0)
817 sc_width = DEF_SC_WIDTH;
820 #if MSDOS_COMPILER==MSOFTC
822 * Figure out how many empty loops it takes to delay a millisecond.
830 * Get synchronized at the start of a tick.
833 while (clock() == start)
836 * Now count loops till the next tick.
840 while (clock() == start)
843 * Convert from (loops per clock) to (loops per millisecond).
845 msec_loops *= CLOCKS_PER_SEC;
850 * Delay for a specified number of milliseconds.
855 static long delay_dummy = 0;
867 for (i = 0; i < msec_loops; i++)
870 * Make it look like we're doing something here,
871 * so the optimizer doesn't remove the whole loop.
880 * Return the characters actually input by a "special" key.
886 static char tbuf[40];
888 #if MSDOS_COMPILER || OS2
889 static char k_right[] = { '\340', PCK_RIGHT, 0 };
890 static char k_left[] = { '\340', PCK_LEFT, 0 };
891 static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 };
892 static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 };
893 static char k_insert[] = { '\340', PCK_INSERT, 0 };
894 static char k_delete[] = { '\340', PCK_DELETE, 0 };
895 static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 };
896 static char k_ctl_backspace[] = { '\177', 0 };
897 static char k_home[] = { '\340', PCK_HOME, 0 };
898 static char k_end[] = { '\340', PCK_END, 0 };
899 static char k_up[] = { '\340', PCK_UP, 0 };
900 static char k_down[] = { '\340', PCK_DOWN, 0 };
901 static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 };
902 static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 };
903 static char k_pageup[] = { '\340', PCK_PAGEUP, 0 };
904 static char k_f1[] = { '\340', PCK_F1, 0 };
914 * If windowid is not NULL, assume less is executed in
915 * the XFree86 environment.
918 s = windowid ? ltgetstr("kr", &sp) : k_right;
921 s = windowid ? ltgetstr("kl", &sp) : k_left;
924 s = windowid ? ltgetstr("ku", &sp) : k_up;
927 s = windowid ? ltgetstr("kd", &sp) : k_down;
930 s = windowid ? ltgetstr("kP", &sp) : k_pageup;
933 s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
936 s = windowid ? ltgetstr("kh", &sp) : k_home;
939 s = windowid ? ltgetstr("@7", &sp) : k_end;
944 s = ltgetstr("kD", &sp);
984 #if MSDOS_COMPILER || OS2
988 case SK_CTL_LEFT_ARROW:
991 case SK_CTL_RIGHT_ARROW:
994 case SK_CTL_BACKSPACE:
1007 case SK_RIGHT_ARROW:
1008 s = ltgetstr("kr", &sp);
1011 s = ltgetstr("kl", &sp);
1014 s = ltgetstr("ku", &sp);
1017 s = ltgetstr("kd", &sp);
1020 s = ltgetstr("kP", &sp);
1023 s = ltgetstr("kN", &sp);
1026 s = ltgetstr("kh", &sp);
1029 s = ltgetstr("@7", &sp);
1032 s = ltgetstr("kD", &sp);
1042 tbuf[0] = CONTROL('K');
1053 * Get terminal capabilities via termcap.
1064 * Set up default colors.
1065 * The xx_s_width and xx_e_width vars are already initialized to 0.
1067 #if MSDOS_COMPILER==MSOFTC
1068 sy_bg_color = _getbkcolor();
1069 sy_fg_color = _gettextcolor();
1072 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1076 sy_bg_color = (w.attribute >> 4) & 0x0F;
1077 sy_fg_color = (w.attribute >> 0) & 0x0F;
1080 #if MSDOS_COMPILER==WIN32C
1083 CONSOLE_SCREEN_BUFFER_INFO scr;
1085 con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
1087 * Always open stdin in binary. Note this *must* be done
1088 * before any file operations have been done on fd0.
1091 GetConsoleScreenBufferInfo(con_out, &scr);
1092 ReadConsoleOutputAttribute(con_out, &curr_attr,
1093 1, scr.dwCursorPosition, &nread);
1094 sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
1095 sy_fg_color = curr_attr & FG_COLORS;
1100 nm_fg_color = sy_fg_color;
1101 nm_bg_color = sy_bg_color;
1112 * Get size of the screen.
1118 #else /* !MSDOS_COMPILER */
1121 register char *t1, *t2;
1123 char termbuf[TERMBUF_SIZE];
1125 static char sbuf[TERMSBUF_SIZE];
1129 * Make sure the termcap database is available.
1131 sp = lgetenv("TERMCAP");
1132 if (sp == NULL || *sp == '\0')
1135 if ((sp = homefile("termcap.dat")) != NULL)
1137 termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
1138 sprintf(termcap, "TERMCAP=%s", sp);
1145 * Find out what kind of terminal this is.
1147 if ((term = lgetenv("TERM")) == NULL)
1148 term = DEFAULT_TERM;
1150 if (tgetent(termbuf, term) != TGETENT_OK)
1152 if (ltgetflag("hc"))
1156 * Get size of the screen.
1161 auto_wrap = ltgetflag("am");
1162 ignaw = ltgetflag("xn");
1163 above_mem = ltgetflag("da");
1164 below_mem = ltgetflag("db");
1165 clear_bg = ltgetflag("ut");
1168 * Assumes termcap variable "sg" is the printing width of:
1169 * the standout sequence, the end standout sequence,
1170 * the underline sequence, the end underline sequence,
1171 * the boldface sequence, and the end boldface sequence.
1173 if ((so_s_width = ltgetnum("sg")) < 0)
1175 so_e_width = so_s_width;
1177 bo_s_width = bo_e_width = so_s_width;
1178 ul_s_width = ul_e_width = so_s_width;
1179 bl_s_width = bl_e_width = so_s_width;
1182 if (so_s_width > 0 || so_e_width > 0)
1184 * Disable highlighting by default on magic cookie terminals.
1185 * Turning on highlighting might change the displayed width
1186 * of a line, causing the display to get messed up.
1187 * The user can turn it back on with -g,
1188 * but she won't like the results.
1194 * Get various string-valued capabilities.
1199 sc_pad = ltgetstr("pc", &sp);
1204 sc_s_keypad = ltgetstr("ks", &sp);
1205 if (sc_s_keypad == NULL)
1207 sc_e_keypad = ltgetstr("ke", &sp);
1208 if (sc_e_keypad == NULL)
1211 sc_init = ltgetstr("ti", &sp);
1212 if (sc_init == NULL)
1215 sc_deinit= ltgetstr("te", &sp);
1216 if (sc_deinit == NULL)
1219 sc_eol_clear = ltgetstr("ce", &sp);
1220 if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
1226 sc_eos_clear = ltgetstr("cd", &sp);
1227 if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
1233 sc_clear = ltgetstr("cl", &sp);
1234 if (sc_clear == NULL || *sc_clear == '\0')
1240 sc_move = ltgetstr("cm", &sp);
1241 if (sc_move == NULL || *sc_move == '\0')
1244 * This is not an error here, because we don't
1245 * always need sc_move.
1246 * We need it only if we don't have home or lower-left.
1253 tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
1254 tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
1255 tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
1256 tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);
1258 sc_visual_bell = ltgetstr("vb", &sp);
1259 if (sc_visual_bell == NULL)
1260 sc_visual_bell = "";
1262 if (ltgetflag("bs"))
1263 sc_backspace = "\b";
1266 sc_backspace = ltgetstr("bc", &sp);
1267 if (sc_backspace == NULL || *sc_backspace == '\0')
1268 sc_backspace = "\b";
1272 * Choose between using "ho" and "cm" ("home" and "cursor move")
1273 * to move the cursor to the upper left corner of the screen.
1275 t1 = ltgetstr("ho", &sp);
1278 if (*sc_move == '\0')
1282 strcpy(sp, tgoto(sc_move, 0, 0));
1284 sp += strlen(sp) + 1;
1286 sc_home = cheaper(t1, t2, "|\b^");
1289 * Choose between using "ll" and "cm" ("lower left" and "cursor move")
1290 * to move the cursor to the lower left corner of the screen.
1292 t1 = ltgetstr("ll", &sp);
1295 if (*sc_move == '\0')
1299 strcpy(sp, tgoto(sc_move, 0, sc_height-1));
1301 sp += strlen(sp) + 1;
1303 sc_lower_left = cheaper(t1, t2, "\r");
1306 * Get carriage return string.
1308 sc_return = ltgetstr("cr", &sp);
1309 if (sc_return == NULL)
1313 * Choose between using "al" or "sr" ("add line" or "scroll reverse")
1314 * to add a line at the top of the screen.
1316 t1 = ltgetstr("al", &sp);
1319 t2 = ltgetstr("sr", &sp);
1323 if (*t1 == '\0' && *t2 == '\0')
1330 sc_addline = cheaper(t1, t2, "");
1331 if (*sc_addline == '\0')
1334 * Force repaint on any backward movement.
1338 #endif /* MSDOS_COMPILER */
1343 * Return the cost of displaying a termcap string.
1344 * We use the trick of calling tputs, but as a char printing function
1345 * we give it inc_costcount, which just increments "costcount".
1346 * This tells us how many chars would be printed by using this string.
1347 * {{ Couldn't we just use strlen? }}
1349 static int costcount;
1365 tputs(t, sc_height, inc_costcount);
1370 * Return the "best" of the two given termcap strings.
1371 * The best, if both exist, is the one with the lower
1372 * cost (see cost() function).
1375 cheaper(t1, t2, def)
1379 if (*t1 == '\0' && *t2 == '\0')
1388 if (cost(t1) < cost(t2))
1394 tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
1403 *instr = ltgetstr(incap, spp);
1408 *outstr = def_outstr;
1412 *outstr = ltgetstr(outcap, spp);
1413 if (*outstr == NULL)
1414 /* No specific out capability; use "me". */
1415 *outstr = ltgetstr("me", spp);
1416 if (*outstr == NULL)
1417 /* Don't even have "me"; use a null string. */
1421 #endif /* MSDOS_COMPILER */
1425 * Below are the functions which perform all the
1426 * terminal-specific screen manipulation.
1432 #if MSDOS_COMPILER==WIN32C
1434 _settextposition(int row, int col)
1437 CONSOLE_SCREEN_BUFFER_INFO csbi;
1439 GetConsoleScreenBufferInfo(con_out, &csbi);
1440 cpos.X = csbi.srWindow.Left + (col - 1);
1441 cpos.Y = csbi.srWindow.Top + (row - 1);
1442 SetConsoleCursorPosition(con_out, cpos);
1447 * Initialize the screen to the correct color at startup.
1452 SETCOLORS(nm_fg_color, nm_bg_color);
1455 * This clears the screen at startup. This is different from
1456 * the behavior of other versions of less. Disable it for now.
1463 * Create a complete, blank screen using "normal" colors.
1465 SETCOLORS(nm_fg_color, nm_bg_color);
1466 blanks = (char *) ecalloc(width+1, sizeof(char));
1467 for (col = 0; col < sc_width; col++)
1469 blanks[sc_width] = '\0';
1470 for (row = 0; row < sc_height; row++)
1477 #if MSDOS_COMPILER==WIN32C
1480 * Termcap-like init with a private win32 console.
1485 CONSOLE_SCREEN_BUFFER_INFO scr;
1488 if (con_out_save == INVALID_HANDLE_VALUE)
1491 GetConsoleScreenBufferInfo(con_out_save, &scr);
1493 if (con_out_ours == INVALID_HANDLE_VALUE)
1496 * Create our own screen buffer, so that we
1497 * may restore the original when done.
1499 con_out_ours = CreateConsoleScreenBuffer(
1500 GENERIC_WRITE | GENERIC_READ,
1501 FILE_SHARE_WRITE | FILE_SHARE_READ,
1502 (LPSECURITY_ATTRIBUTES) NULL,
1503 CONSOLE_TEXTMODE_BUFFER,
1507 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1508 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1509 SetConsoleScreenBufferSize(con_out_ours, size);
1510 SetConsoleActiveScreenBuffer(con_out_ours);
1511 con_out = con_out_ours;
1515 * Restore the startup console.
1520 if (con_out_save == INVALID_HANDLE_VALUE)
1523 (void) CloseHandle(con_out_ours);
1524 SetConsoleActiveScreenBuffer(con_out_save);
1525 con_out = con_out_save;
1531 * Initialize terminal
1538 tputs(sc_init, sc_height, putchr);
1540 tputs(sc_s_keypad, sc_height, putchr);
1546 * This is nice to terminals with no alternate screen,
1547 * but with saved scrolled-off-the-top lines. This way,
1548 * no previous line is lost, but we start with a whole
1549 * screen to ourself.
1551 for (i = 1; i < sc_height; i++)
1556 #if MSDOS_COMPILER==WIN32C
1567 * Deinitialize terminal
1576 tputs(sc_e_keypad, sc_height, putchr);
1578 tputs(sc_deinit, sc_height, putchr);
1580 /* Restore system colors. */
1581 SETCOLORS(sy_fg_color, sy_bg_color);
1582 #if MSDOS_COMPILER==WIN32C
1584 win32_deinit_term();
1586 /* Need clreol to make SETCOLORS take effect. */
1594 * Home cursor (move to upper left corner of screen).
1600 tputs(sc_home, 1, putchr);
1603 _settextposition(1,1);
1608 * Add a blank line (called with cursor at home).
1609 * Should scroll the display down.
1615 tputs(sc_addline, sc_height, putchr);
1618 #if MSDOS_COMPILER==MSOFTC
1619 _scrolltextwindow(_GSCROLLDOWN);
1620 _settextposition(1,1);
1622 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1623 movetext(1,1, sc_width,sc_height-1, 1,2);
1627 #if MSDOS_COMPILER==WIN32C
1630 SMALL_RECT rcSrc, rcClip;
1632 CONSOLE_SCREEN_BUFFER_INFO csbi;
1634 GetConsoleScreenBufferInfo(con_out,&csbi);
1636 /* The clip rectangle is the entire visible screen. */
1637 rcClip.Left = csbi.srWindow.Left;
1638 rcClip.Top = csbi.srWindow.Top;
1639 rcClip.Right = csbi.srWindow.Right;
1640 rcClip.Bottom = csbi.srWindow.Bottom;
1642 /* The source rectangle is the visible screen minus the last line. */
1646 /* Move the top left corner of the source window down one row. */
1647 new_org.X = rcSrc.Left;
1648 new_org.Y = rcSrc.Top + 1;
1650 /* Fill the right character and attributes. */
1651 fillchar.Char.AsciiChar = ' ';
1652 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1653 fillchar.Attributes = curr_attr;
1654 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1655 _settextposition(1,1);
1665 * Remove the n topmost lines and scroll everything below it in the
1666 * window upward. This is needed to stop leaking the topmost line
1667 * into the scrollback buffer when we go down-one-line (in WIN32).
1673 #if MSDOS_COMPILER==WIN32C
1674 SMALL_RECT rcSrc, rcClip;
1677 CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */
1679 if (n >= sc_height - 1)
1688 GetConsoleScreenBufferInfo(con_out, &csbi);
1690 /* Get the extent of all-visible-rows-but-the-last. */
1691 rcSrc.Left = csbi.srWindow.Left;
1692 rcSrc.Top = csbi.srWindow.Top + n;
1693 rcSrc.Right = csbi.srWindow.Right;
1694 rcSrc.Bottom = csbi.srWindow.Bottom;
1696 /* Get the clip rectangle. */
1697 rcClip.Left = rcSrc.Left;
1698 rcClip.Top = csbi.srWindow.Top;
1699 rcClip.Right = rcSrc.Right;
1700 rcClip.Bottom = rcSrc.Bottom ;
1702 /* Move the source window up n rows. */
1703 new_org.X = rcSrc.Left;
1704 new_org.Y = rcSrc.Top - n;
1706 /* Fill the right character and attributes. */
1707 fillchar.Char.AsciiChar = ' ';
1708 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1709 fillchar.Attributes = curr_attr;
1711 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1713 /* Position cursor on first blank line. */
1714 goto_line(sc_height - n - 1);
1719 #if MSDOS_COMPILER==WIN32C
1727 * This will clear only the currently visible rows of the NT
1728 * console buffer, which means none of the precious scrollback
1729 * rows are touched making for faster scrolling. Note that, if
1730 * the window has fewer columns than the console buffer (i.e.
1731 * there is a horizontal scrollbar as well), the entire width
1732 * of the visible rows will be cleared.
1737 CONSOLE_SCREEN_BUFFER_INFO csbi;
1739 /* get the number of cells in the current buffer */
1740 GetConsoleScreenBufferInfo(con_out, &csbi);
1741 winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
1743 topleft.Y = csbi.srWindow.Top;
1745 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
1746 FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
1747 FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
1751 * Remove the n topmost lines and scroll everything below it in the
1758 SMALL_RECT rcSrc, rcClip;
1764 CONSOLE_SCREEN_BUFFER_INFO csbi;
1769 if (n >= sc_height - 1)
1772 _settextposition(1,1);
1776 /* Get the extent of what will remain visible after scrolling. */
1777 GetConsoleScreenBufferInfo(con_out, &csbi);
1778 rcSrc.Left = csbi.srWindow.Left;
1779 rcSrc.Top = csbi.srWindow.Top + n;
1780 rcSrc.Right = csbi.srWindow.Right;
1781 rcSrc.Bottom = csbi.srWindow.Bottom;
1783 /* Get the clip rectangle. */
1784 rcClip.Left = rcSrc.Left;
1785 rcClip.Top = csbi.srWindow.Top;
1786 rcClip.Right = rcSrc.Right;
1787 rcClip.Bottom = rcSrc.Bottom ;
1789 /* Move the source text to the top of the screen. */
1790 new_org.X = rcSrc.Left;
1791 new_org.Y = rcClip.Top;
1793 /* Fill the right character and attributes. */
1794 fillchar.Char.AsciiChar = ' ';
1795 fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);
1797 /* Scroll the window. */
1798 SetConsoleTextAttribute(con_out, fillchar.Attributes);
1799 ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
1801 /* Clear remaining lines at bottom. */
1802 topleft.X = csbi.dwCursorPosition.X;
1803 topleft.Y = rcSrc.Bottom - n;
1804 size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
1805 FillConsoleOutputCharacter(con_out, ' ', size, topleft,
1807 FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
1809 SetConsoleTextAttribute(con_out, curr_attr);
1811 /* Move cursor n lines up from where it was. */
1812 csbi.dwCursorPosition.Y -= n;
1813 SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
1818 * Move cursor to lower left corner of screen.
1824 tputs(sc_lower_left, 1, putchr);
1827 _settextposition(sc_height, 1);
1832 * Move cursor to left position of current line.
1838 tputs(sc_return, 1, putchr);
1842 #if MSDOS_COMPILER==WIN32C
1844 CONSOLE_SCREEN_BUFFER_INFO scr;
1845 GetConsoleScreenBufferInfo(con_out, &scr);
1846 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
1849 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
1853 struct rccoord tpos = _gettextposition();
1858 _settextposition(row, 1);
1863 * Check if the console size has changed and reset internals
1864 * (in lieu of SIGWINCH for WIN32).
1869 #if MSDOS_COMPILER==WIN32C
1870 CONSOLE_SCREEN_BUFFER_INFO scr;
1873 if (con_out == INVALID_HANDLE_VALUE)
1877 GetConsoleScreenBufferInfo(con_out, &scr);
1878 size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
1879 size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
1880 if (size.Y != sc_height || size.X != sc_width)
1884 if (!no_init && con_out_ours == con_out)
1885 SetConsoleScreenBufferSize(con_out, size);
1887 wscroll = (sc_height + 1) / 2;
1894 * Goto a specific line on the screen.
1901 tputs(tgoto(sc_move, 0, slinenum), 1, putchr);
1904 _settextposition(slinenum+1, 1);
1908 #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
1910 * Create an alternate screen which is all white.
1911 * This screen is used to create a "flash" effect, by displaying it
1912 * briefly and then switching back to the normal screen.
1913 * {{ Yuck! There must be a better way to get a visual bell. }}
1918 #if MSDOS_COMPILER==MSOFTC
1919 struct videoconfig w;
1923 _getvideoconfig(&w);
1924 videopages = w.numvideopages;
1927 at_enter(AT_STANDOUT);
1932 at_enter(AT_STANDOUT);
1933 blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
1934 for (col = 0; col < w.numtextcols; col++)
1936 for (row = w.numtextrows; row > 0; row--)
1937 _outmem(blanks, w.numtextcols);
1944 #if MSDOS_COMPILER==BORLANDC
1947 whitescreen = (unsigned short *)
1948 malloc(sc_width * sc_height * sizeof(short));
1949 if (whitescreen == NULL)
1951 for (n = 0; n < sc_width * sc_height; n++)
1952 whitescreen[n] = 0x7020;
1954 #if MSDOS_COMPILER==WIN32C
1957 whitescreen = (WORD *)
1958 malloc(sc_height * sc_width * sizeof(WORD));
1959 if (whitescreen == NULL)
1961 /* Invert the standard colors. */
1962 for (n = 0; n < sc_width * sc_height; n++)
1963 whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
1969 #endif /* MSDOS_COMPILER */
1972 * Output the "visual bell", if there is one.
1978 if (*sc_visual_bell == '\0')
1980 tputs(sc_visual_bell, sc_height, putchr);
1982 #if MSDOS_COMPILER==DJGPPC
1985 #if MSDOS_COMPILER==MSOFTC
1987 * Create a flash screen on the second video page.
1988 * Switch to that page, then switch back.
1998 #if MSDOS_COMPILER==BORLANDC
1999 unsigned short *currscreen;
2002 * Get a copy of the current screen.
2003 * Display the flash screen.
2004 * Then restore the old screen.
2008 if (whitescreen == NULL)
2010 currscreen = (unsigned short *)
2011 malloc(sc_width * sc_height * sizeof(short));
2012 if (currscreen == NULL) return;
2013 gettext(1, 1, sc_width, sc_height, currscreen);
2014 puttext(1, 1, sc_width, sc_height, whitescreen);
2016 puttext(1, 1, sc_width, sc_height, currscreen);
2019 #if MSDOS_COMPILER==WIN32C
2020 /* paint screen with an inverse color */
2023 /* leave it displayed for 100 msec. */
2026 /* restore with a redraw */
2042 putchr(CONTROL('G'));
2044 #if MSDOS_COMPILER==WIN32C
2053 * Ring the terminal bell.
2058 if (quiet == VERY_QUIET)
2071 tputs(sc_clear, sc_height, putchr);
2074 #if MSDOS_COMPILER==WIN32C
2077 _clearscreen(_GCLEARSCREEN);
2083 * Clear from the cursor to the end of the cursor's line.
2084 * {{ This must not move the cursor. }}
2090 tputs(sc_eol_clear, 1, putchr);
2092 #if MSDOS_COMPILER==MSOFTC
2095 struct rccoord tpos;
2099 * Save current state.
2101 tpos = _gettextposition();
2102 _gettextwindow(&top, &left, &bot, &right);
2104 * Set a temporary window to the current line,
2105 * from the cursor's position to the right edge of the screen.
2106 * Then clear that window.
2108 _settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
2109 _clearscreen(_GWINDOW);
2113 _settextwindow(top, left, bot, right);
2114 _settextposition(tpos.row, tpos.col);
2116 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2120 #if MSDOS_COMPILER==WIN32C
2123 CONSOLE_SCREEN_BUFFER_INFO scr;
2126 memset(&scr, 0, sizeof(scr));
2127 GetConsoleScreenBufferInfo(con_out, &scr);
2128 cpos.X = scr.dwCursorPosition.X;
2129 cpos.Y = scr.dwCursorPosition.Y;
2130 curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
2131 FillConsoleOutputAttribute(con_out, curr_attr,
2132 scr.dwSize.X - cpos.X, cpos, &nchars);
2133 FillConsoleOutputCharacter(con_out, ' ',
2134 scr.dwSize.X - cpos.X, cpos, &nchars);
2142 * Clear the current line.
2143 * Clear the screen if there's off-screen memory below the display.
2152 tputs(sc_eos_clear, 1, putchr);
2154 tputs(sc_eol_clear, 1, putchr);
2159 * Clear the bottom line of the display.
2160 * Leave the cursor at the beginning of the bottom line.
2166 * If we're in a non-normal attribute mode, temporarily exit
2167 * the mode while we do the clear. Some terminals fill the
2168 * cleared area with the current attribute.
2175 if (attrmode == AT_NORMAL)
2179 int saved_attrmode = attrmode;
2183 at_enter(saved_attrmode);
2191 attr = apply_at_specials(attr);
2194 /* The one with the most priority is last. */
2195 if (attr & AT_UNDERLINE)
2196 tputs(sc_u_in, 1, putchr);
2198 tputs(sc_b_in, 1, putchr);
2199 if (attr & AT_BLINK)
2200 tputs(sc_bl_in, 1, putchr);
2201 if (attr & AT_STANDOUT)
2202 tputs(sc_s_in, 1, putchr);
2205 /* The one with the most priority is first. */
2206 if (attr & AT_STANDOUT)
2208 SETCOLORS(so_fg_color, so_bg_color);
2209 } else if (attr & AT_BLINK)
2211 SETCOLORS(bl_fg_color, bl_bg_color);
2213 else if (attr & AT_BOLD)
2215 SETCOLORS(bo_fg_color, bo_bg_color);
2217 else if (attr & AT_UNDERLINE)
2219 SETCOLORS(ul_fg_color, ul_bg_color);
2230 /* Undo things in the reverse order we did them. */
2231 if (attrmode & AT_STANDOUT)
2232 tputs(sc_s_out, 1, putchr);
2233 if (attrmode & AT_BLINK)
2234 tputs(sc_bl_out, 1, putchr);
2235 if (attrmode & AT_BOLD)
2236 tputs(sc_b_out, 1, putchr);
2237 if (attrmode & AT_UNDERLINE)
2238 tputs(sc_u_out, 1, putchr);
2241 SETCOLORS(nm_fg_color, nm_bg_color);
2244 attrmode = AT_NORMAL;
2251 int new_attrmode = apply_at_specials(attr);
2252 int ignore_modes = AT_ANSI;
2254 if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
2262 is_at_equiv(attr1, attr2)
2266 attr1 = apply_at_specials(attr1);
2267 attr2 = apply_at_specials(attr2);
2269 return (attr1 == attr2);
2273 apply_at_specials(attr)
2276 if (attr & AT_BINARY)
2278 if (attr & AT_HILITE)
2279 attr |= AT_STANDOUT;
2280 attr &= ~(AT_BINARY|AT_HILITE);
2285 #if 0 /* No longer used */
2287 * Erase the character to the left of the cursor
2288 * and move the cursor left.
2295 * Erase the previous character by overstriking with a space.
2297 tputs(sc_backspace, 1, putchr);
2299 tputs(sc_backspace, 1, putchr);
2301 #if MSDOS_COMPILER==MSOFTC
2302 struct rccoord tpos;
2305 tpos = _gettextposition();
2308 _settextposition(tpos.row, tpos.col-1);
2310 _settextposition(tpos.row, tpos.col-1);
2312 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2315 #if MSDOS_COMPILER==WIN32C
2318 CONSOLE_SCREEN_BUFFER_INFO scr;
2321 GetConsoleScreenBufferInfo(con_out, &scr);
2322 cpos = scr.dwCursorPosition;
2326 SetConsoleCursorPosition(con_out, cpos);
2327 FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
2328 SetConsoleCursorPosition(con_out, cpos);
2337 * Output a plain backspace, without erasing the previous char.
2343 tputs(sc_backspace, 1, putchr);
2349 #if MSDOS_COMPILER==MSOFTC
2350 struct rccoord tpos;
2351 tpos = _gettextposition();
2355 #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
2359 #if MSDOS_COMPILER==WIN32C
2360 CONSOLE_SCREEN_BUFFER_INFO scr;
2361 GetConsoleScreenBufferInfo(con_out, &scr);
2362 row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
2363 col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
2370 _settextposition(row, col-1);
2371 #endif /* MSDOS_COMPILER */
2374 #if MSDOS_COMPILER==WIN32C
2376 * Determine whether an input character is waiting to be read.
2388 currentKey.ascii = 0;
2389 currentKey.scan = 0;
2392 * Wait for a real key-down event, but
2393 * ignore SHIFT and CONTROL key events.
2397 PeekConsoleInput(tty, &ip, 1, &read);
2400 ReadConsoleInput(tty, &ip, 1, &read);
2401 } while (ip.EventType != KEY_EVENT ||
2402 ip.Event.KeyEvent.bKeyDown != TRUE ||
2403 ip.Event.KeyEvent.wVirtualScanCode == 0 ||
2404 ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
2405 ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
2406 ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
2408 currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
2409 currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
2410 keyCount = ip.Event.KeyEvent.wRepeatCount;
2412 if (ip.Event.KeyEvent.dwControlKeyState &
2413 (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
2415 switch (currentKey.scan)
2417 case PCK_ALT_E: /* letter 'E' */
2418 currentKey.ascii = 0;
2421 } else if (ip.Event.KeyEvent.dwControlKeyState &
2422 (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
2424 switch (currentKey.scan)
2426 case PCK_RIGHT: /* right arrow */
2427 currentKey.scan = PCK_CTL_RIGHT;
2429 case PCK_LEFT: /* left arrow */
2430 currentKey.scan = PCK_CTL_LEFT;
2432 case PCK_DELETE: /* delete */
2433 currentKey.scan = PCK_CTL_DELETE;
2441 * Read a character from the keyboard.
2449 if (pending_scancode)
2451 pending_scancode = 0;
2452 return ((char)(currentKey.scan & 0x00FF));
2455 while (win32_kbhit((HANDLE)tty) == FALSE)
2463 ascii = currentKey.ascii;
2465 * On PC's, the extended keys return a 2 byte sequence beginning
2466 * with '00', so if the ascii code is 00, the next byte will be
2467 * the lsb of the scan code.
2469 pending_scancode = (ascii == 0x00);
2470 return ((char)ascii);
2478 WIN32setcolors(fg, bg)
2488 WIN32textout(text, len)
2492 #if MSDOS_COMPILER==WIN32C
2494 WriteConsole(con_out, text, len, &written, NULL);