output.c revision 240121 
1/*
2 * Copyright (C) 1984-2012  Mark Nudelman
3 *
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.
6 *
7 * For more information, see the README file.
8 */
9
10
11/*
12 * High level routines dealing with the output to the screen.
13 */
14
15#include "less.h"
16#if MSDOS_COMPILER==WIN32C
17#include "windows.h"
18#endif
19
20public int errmsgs;	/* Count of messages displayed by error() */
21public int need_clr;
22public int final_attr;
23public int at_prompt;
24
25extern int sigs;
26extern int sc_width;
27extern int so_s_width, so_e_width;
28extern int screen_trashed;
29extern int any_display;
30extern int is_tty;
31extern int oldbot;
32
33#if MSDOS_COMPILER==WIN32C || MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
34extern int ctldisp;
35extern int nm_fg_color, nm_bg_color;
36extern int bo_fg_color, bo_bg_color;
37extern int ul_fg_color, ul_bg_color;
38extern int so_fg_color, so_bg_color;
39extern int bl_fg_color, bl_bg_color;
40#endif
41
42/*
43 * Display the line which is in the line buffer.
44 */
45	public void
46put_line()
47{
48	register int c;
49	register int i;
50	int a;
51
52	if (ABORT_SIGS())
53	{
54		/*
55		 * Don't output if a signal is pending.
56		 */
57		screen_trashed = 1;
58		return;
59	}
60
61	final_attr = AT_NORMAL;
62
63	for (i = 0;  (c = gline(i, &a)) != '\0';  i++)
64	{
65		at_switch(a);
66		final_attr = a;
67		if (c == '\b')
68			putbs();
69		else
70			putchr(c);
71	}
72
73	at_exit();
74}
75
76static char obuf[OUTBUF_SIZE];
77static char *ob = obuf;
78
79/*
80 * Flush buffered output.
81 *
82 * If we haven't displayed any file data yet,
83 * output messages on error output (file descriptor 2),
84 * otherwise output on standard output (file descriptor 1).
85 *
86 * This has the desirable effect of producing all
87 * error messages on error output if standard output
88 * is directed to a file.  It also does the same if
89 * we never produce any real output; for example, if
90 * the input file(s) cannot be opened.  If we do
91 * eventually produce output, code in edit() makes
92 * sure these messages can be seen before they are
93 * overwritten or scrolled away.
94 */
95	public void
96flush()
97{
98	register int n;
99	register int fd;
100
101	n = ob - obuf;
102	if (n == 0)
103		return;
104
105#if MSDOS_COMPILER==MSOFTC
106	if (is_tty && any_display)
107	{
108		*ob = '\0';
109		_outtext(obuf);
110		ob = obuf;
111		return;
112	}
113#else
114#if MSDOS_COMPILER==WIN32C || MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
115	if (is_tty && any_display)
116	{
117		*ob = '\0';
118		if (ctldisp != OPT_ONPLUS)
119			WIN32textout(obuf, ob - obuf);
120		else
121		{
122			/*
123			 * Look for SGR escape sequences, and convert them
124			 * to color commands.  Replace bold, underline,
125			 * and italic escapes into colors specified via
126			 * the -D command-line option.
127			 */
128			char *anchor, *p, *p_next;
129			unsigned char fg, bg;
130			static unsigned char at;
131#if MSDOS_COMPILER==WIN32C
132			/* Screen colors used by 3x and 4x SGR commands. */
133			static unsigned char screen_color[] = {
134				0, /* BLACK */
135				FOREGROUND_RED,
136				FOREGROUND_GREEN,
137				FOREGROUND_RED|FOREGROUND_GREEN,
138				FOREGROUND_BLUE,
139				FOREGROUND_BLUE|FOREGROUND_RED,
140				FOREGROUND_BLUE|FOREGROUND_GREEN,
141				FOREGROUND_BLUE|FOREGROUND_GREEN|FOREGROUND_RED
142			};
143#else
144			static enum COLORS screen_color[] = {
145				BLACK, RED, GREEN, BROWN,
146				BLUE, MAGENTA, CYAN, LIGHTGRAY
147			};
148#endif
149
150			for (anchor = p_next = obuf;
151			     (p_next = memchr(p_next, ESC, ob - p_next)) != NULL; )
152			{
153				p = p_next;
154				if (p[1] == '[')  /* "ESC-[" sequence */
155				{
156					if (p > anchor)
157					{
158						/*
159						 * If some chars seen since
160						 * the last escape sequence,
161						 * write them out to the screen.
162						 */
163						WIN32textout(anchor, p-anchor);
164						anchor = p;
165					}
166					p += 2;  /* Skip the "ESC-[" */
167					if (is_ansi_end(*p))
168					{
169						/*
170						 * Handle null escape sequence
171						 * "ESC[m", which restores
172						 * the normal color.
173						 */
174						p++;
175						anchor = p_next = p;
176						at = 0;
177						WIN32setcolors(nm_fg_color, nm_bg_color);
178						continue;
179					}
180					p_next = p;
181
182					/*
183					 * Select foreground/background colors
184					 * based on the escape sequence.
185					 */
186					fg = nm_fg_color;
187					bg = nm_bg_color;
188					while (!is_ansi_end(*p))
189					{
190						char *q;
191						long code = strtol(p, &q, 10);
192
193						if (*q == '\0')
194						{
195							/*
196							 * Incomplete sequence.
197							 * Leave it unprocessed
198							 * in the buffer.
199							 */
200							int slop = q - anchor;
201							/* {{ strcpy args overlap! }} */
202							strcpy(obuf, anchor);
203							ob = &obuf[slop];
204							return;
205						}
206
207						if (q == p ||
208						    code > 49 || code < 0 ||
209						    (!is_ansi_end(*q) && *q != ';'))
210						{
211							p_next = q;
212							break;
213						}
214						if (*q == ';')
215							q++;
216
217						switch (code)
218						{
219						default:
220						/* case 0: all attrs off */
221							fg = nm_fg_color;
222							bg = nm_bg_color;
223							at = 0;
224							break;
225						case 1:	/* bold on */
226							at |= 1;
227							break;
228						case 3:	/* italic on */
229						case 7: /* inverse on */
230							at |= 2;
231							break;
232						case 4:	/* underline on */
233							at |= 4;
234							break;
235						case 5: /* slow blink on */
236						case 6: /* fast blink on */
237							at |= 8;
238							break;
239						case 8:	/* concealed on */
240							fg = (bg & 7) | 8;
241							break;
242						case 22: /* bold off */
243							at &= ~1;
244							break;
245						case 23: /* italic off */
246						case 27: /* inverse off */
247							at &= ~2;
248							break;
249						case 24: /* underline off */
250							at &= ~4;
251							break;
252						case 30: case 31: case 32:
253						case 33: case 34: case 35:
254						case 36: case 37:
255							fg = (fg & 8) | (screen_color[code - 30]);
256							break;
257						case 39: /* default fg */
258							fg = nm_fg_color;
259							break;
260						case 40: case 41: case 42:
261						case 43: case 44: case 45:
262						case 46: case 47:
263							bg = (bg & 8) | (screen_color[code - 40]);
264							break;
265						case 49: /* default fg */
266							bg = nm_bg_color;
267							break;
268						}
269						p = q;
270					}
271					if (!is_ansi_end(*p) || p == p_next)
272						break;
273					if (at & 1)
274					{
275						/*
276						 * If \e[1m use defined bold
277						 * color, else set intensity.
278						 */
279						if (p[-2] == '[')
280						{
281							fg = bo_fg_color;
282							bg = bo_bg_color;
283						} else
284							fg |= 8;
285					} else if (at & 2)
286					{
287						fg = so_fg_color;
288						bg = so_bg_color;
289					} else if (at & 4)
290					{
291						fg = ul_fg_color;
292						bg = ul_bg_color;
293					} else if (at & 8)
294					{
295						fg = bl_fg_color;
296						bg = bl_bg_color;
297					}
298					fg &= 0xf;
299					bg &= 0xf;
300					WIN32setcolors(fg, bg);
301					p_next = anchor = p + 1;
302				} else
303					p_next++;
304			}
305
306			/* Output what's left in the buffer.  */
307			WIN32textout(anchor, ob - anchor);
308		}
309		ob = obuf;
310		return;
311	}
312#endif
313#endif
314	fd = (any_display) ? 1 : 2;
315	if (write(fd, obuf, n) != n)
316		screen_trashed = 1;
317	ob = obuf;
318}
319
320/*
321 * Output a character.
322 */
323	public int
324putchr(c)
325	int c;
326{
327#if 0 /* fake UTF-8 output for testing */
328	extern int utf_mode;
329	if (utf_mode)
330	{
331		static char ubuf[MAX_UTF_CHAR_LEN];
332		static int ubuf_len = 0;
333		static int ubuf_index = 0;
334		if (ubuf_len == 0)
335		{
336			ubuf_len = utf_len(c);
337			ubuf_index = 0;
338		}
339		ubuf[ubuf_index++] = c;
340		if (ubuf_index < ubuf_len)
341			return c;
342		c = get_wchar(ubuf) & 0xFF;
343		ubuf_len = 0;
344	}
345#endif
346	if (need_clr)
347	{
348		need_clr = 0;
349		clear_bot();
350	}
351#if MSDOS_COMPILER
352	if (c == '\n' && is_tty)
353	{
354		/* remove_top(1); */
355		putchr('\r');
356	}
357#else
358#ifdef _OSK
359	if (c == '\n' && is_tty)  /* In OS-9, '\n' == 0x0D */
360		putchr(0x0A);
361#endif
362#endif
363	/*
364	 * Some versions of flush() write to *ob, so we must flush
365	 * when we are still one char from the end of obuf.
366	 */
367	if (ob >= &obuf[sizeof(obuf)-1])
368		flush();
369	*ob++ = c;
370	at_prompt = 0;
371	return (c);
372}
373
374/*
375 * Output a string.
376 */
377	public void
378putstr(s)
379	register char *s;
380{
381	while (*s != '\0')
382		putchr(*s++);
383}
384
385
386/*
387 * Convert an integral type to a string.
388 */
389#define TYPE_TO_A_FUNC(funcname, type) \
390void funcname(num, buf) \
391	type num; \
392	char *buf; \
393{ \
394	int neg = (num < 0); \
395	char tbuf[INT_STRLEN_BOUND(num)+2]; \
396	register char *s = tbuf + sizeof(tbuf); \
397	if (neg) num = -num; \
398	*--s = '\0'; \
399	do { \
400		*--s = (num % 10) + '0'; \
401	} while ((num /= 10) != 0); \
402	if (neg) *--s = '-'; \
403	strcpy(buf, s); \
404}
405
406TYPE_TO_A_FUNC(postoa, POSITION)
407TYPE_TO_A_FUNC(linenumtoa, LINENUM)
408TYPE_TO_A_FUNC(inttoa, int)
409
410/*
411 * Output an integer in a given radix.
412 */
413	static int
414iprint_int(num)
415	int num;
416{
417	char buf[INT_STRLEN_BOUND(num)];
418
419	inttoa(num, buf);
420	putstr(buf);
421	return (strlen(buf));
422}
423
424/*
425 * Output a line number in a given radix.
426 */
427	static int
428iprint_linenum(num)
429	LINENUM num;
430{
431	char buf[INT_STRLEN_BOUND(num)];
432
433	linenumtoa(num, buf);
434	putstr(buf);
435	return (strlen(buf));
436}
437
438/*
439 * This function implements printf-like functionality
440 * using a more portable argument list mechanism than printf's.
441 */
442	static int
443less_printf(fmt, parg)
444	register char *fmt;
445	PARG *parg;
446{
447	register char *s;
448	register int col;
449
450	col = 0;
451	while (*fmt != '\0')
452	{
453		if (*fmt != '%')
454		{
455			putchr(*fmt++);
456			col++;
457		} else
458		{
459			++fmt;
460			switch (*fmt++)
461			{
462			case 's':
463				s = parg->p_string;
464				parg++;
465				while (*s != '\0')
466				{
467					putchr(*s++);
468					col++;
469				}
470				break;
471			case 'd':
472				col += iprint_int(parg->p_int);
473				parg++;
474				break;
475			case 'n':
476				col += iprint_linenum(parg->p_linenum);
477				parg++;
478				break;
479			}
480		}
481	}
482	return (col);
483}
484
485/*
486 * Get a RETURN.
487 * If some other non-trivial char is pressed, unget it, so it will
488 * become the next command.
489 */
490	public void
491get_return()
492{
493	int c;
494
495#if ONLY_RETURN
496	while ((c = getchr()) != '\n' && c != '\r')
497		bell();
498#else
499	c = getchr();
500	if (c != '\n' && c != '\r' && c != ' ' && c != READ_INTR)
501		ungetcc(c);
502#endif
503}
504
505/*
506 * Output a message in the lower left corner of the screen
507 * and wait for carriage return.
508 */
509	public void
510error(fmt, parg)
511	char *fmt;
512	PARG *parg;
513{
514	int col = 0;
515	static char return_to_continue[] = "  (press RETURN)";
516
517	errmsgs++;
518
519	if (any_display && is_tty)
520	{
521		if (!oldbot)
522			squish_check();
523		at_exit();
524		clear_bot();
525		at_enter(AT_STANDOUT);
526		col += so_s_width;
527	}
528
529	col += less_printf(fmt, parg);
530
531	if (!(any_display && is_tty))
532	{
533		putchr('\n');
534		return;
535	}
536
537	putstr(return_to_continue);
538	at_exit();
539	col += sizeof(return_to_continue) + so_e_width;
540
541	get_return();
542	lower_left();
543    clear_eol();
544
545	if (col >= sc_width)
546		/*
547		 * Printing the message has probably scrolled the screen.
548		 * {{ Unless the terminal doesn't have auto margins,
549		 *    in which case we just hammered on the right margin. }}
550		 */
551		screen_trashed = 1;
552
553	flush();
554}
555
556static char intr_to_abort[] = "... (interrupt to abort)";
557
558/*
559 * Output a message in the lower left corner of the screen
560 * and don't wait for carriage return.
561 * Usually used to warn that we are beginning a potentially
562 * time-consuming operation.
563 */
564	public void
565ierror(fmt, parg)
566	char *fmt;
567	PARG *parg;
568{
569	at_exit();
570	clear_bot();
571	at_enter(AT_STANDOUT);
572	(void) less_printf(fmt, parg);
573	putstr(intr_to_abort);
574	at_exit();
575	flush();
576	need_clr = 1;
577}
578
579/*
580 * Output a message in the lower left corner of the screen
581 * and return a single-character response.
582 */
583	public int
584query(fmt, parg)
585	char *fmt;
586	PARG *parg;
587{
588	register int c;
589	int col = 0;
590
591	if (any_display && is_tty)
592		clear_bot();
593
594	(void) less_printf(fmt, parg);
595	c = getchr();
596
597	if (!(any_display && is_tty))
598	{
599		putchr('\n');
600		return (c);
601	}
602
603	lower_left();
604	if (col >= sc_width)
605		screen_trashed = 1;
606	flush();
607
608	return (c);
609}
610