1/* $FreeBSD: head/contrib/less/prompt.c 195941 2009-07-29 09:20:32Z delphij $ */
| 1/* $FreeBSD: head/contrib/less/prompt.c 221715 2011-05-09 21:51:59Z delphij $ */
|
2/*
| 2/*
|
3 * Copyright (C) 1984-2009 Mark Nudelman
| 3 * Copyright (C) 1984-2011 Mark Nudelman
|
4 *
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.
7 *
8 * For more information about less, or for information on how to
9 * contact the author, see the README file.
10 */
11
12
13/*
14 * Prompting and other messages.
15 * There are three flavors of prompts, SHORT, MEDIUM and LONG,
16 * selected by the -m/-M options.
17 * There is also the "equals message", printed by the = command.
18 * A prompt is a message composed of various pieces, such as the
19 * name of the file being viewed, the percentage into the file, etc.
20 */
21
22#include "less.h"
23#include "position.h"
24
25extern int pr_type;
26extern int new_file;
27extern int sc_width;
28extern int so_s_width, so_e_width;
29extern int linenums;
30extern int hshift;
31extern int sc_height;
32extern int jump_sline;
33extern int less_is_more;
34extern IFILE curr_ifile;
35#if EDITOR
36extern char *editor;
37extern char *editproto;
38#endif
39
40/*
41 * Prototypes for the three flavors of prompts.
42 * These strings are expanded by pr_expand().
43 */
44static constant char s_proto[] =
45 "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x..%t";
46static constant char m_proto[] =
47 "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
48static constant char M_proto[] =
49 "?f%f .?n?m(%T %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t";
50static constant char e_proto[] =
51 "?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
52static constant char h_proto[] =
53 "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done";
54static constant char w_proto[] =
55 "Waiting for data";
56static constant char more_proto[] =
57 "--More--(?eEND ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t)";
58
59public char *prproto[3];
60public char constant *eqproto = e_proto;
61public char constant *hproto = h_proto;
62public char constant *wproto = w_proto;
63
64static char message[PROMPT_SIZE];
65static char *mp;
66
67/*
68 * Initialize the prompt prototype strings.
69 */
70 public void
71init_prompt()
72{
73 prproto[0] = save(s_proto);
74 prproto[1] = save(less_is_more ? more_proto : m_proto);
75 prproto[2] = save(M_proto);
76 eqproto = save(e_proto);
77 hproto = save(h_proto);
78 wproto = save(w_proto);
79}
80
81/*
82 * Append a string to the end of the message.
83 */
84 static void
85ap_str(s)
86 char *s;
87{
88 int len;
89
90 len = strlen(s);
91 if (mp + len >= message + PROMPT_SIZE)
92 len = message + PROMPT_SIZE - mp - 1;
93 strncpy(mp, s, len);
94 mp += len;
95 *mp = '\0';
96}
97
98/*
99 * Append a character to the end of the message.
100 */
101 static void
102ap_char(c)
103 char c;
104{
105 char buf[2];
106
107 buf[0] = c;
108 buf[1] = '\0';
109 ap_str(buf);
110}
111
112/*
113 * Append a POSITION (as a decimal integer) to the end of the message.
114 */
115 static void
116ap_pos(pos)
117 POSITION pos;
118{
119 char buf[INT_STRLEN_BOUND(pos) + 2];
120
121 postoa(pos, buf);
122 ap_str(buf);
123}
124
125/*
126 * Append a line number to the end of the message.
127 */
128 static void
129ap_linenum(linenum)
130 LINENUM linenum;
131{
132 char buf[INT_STRLEN_BOUND(linenum) + 2];
133
134 linenumtoa(linenum, buf);
135 ap_str(buf);
136}
137
138/*
139 * Append an integer to the end of the message.
140 */
141 static void
142ap_int(num)
143 int num;
144{
145 char buf[INT_STRLEN_BOUND(num) + 2];
146
147 inttoa(num, buf);
148 ap_str(buf);
149}
150
151/*
152 * Append a question mark to the end of the message.
153 */
154 static void
155ap_quest()
156{
157 ap_str("?");
158}
159
160/*
161 * Return the "current" byte offset in the file.
162 */
163 static POSITION
164curr_byte(where)
165 int where;
166{
167 POSITION pos;
168
169 pos = position(where);
170 while (pos == NULL_POSITION && where >= 0 && where < sc_height-1)
171 pos = position(++where);
172 if (pos == NULL_POSITION)
173 pos = ch_length();
174 return (pos);
175}
176
177/*
178 * Return the value of a prototype conditional.
179 * A prototype string may include conditionals which consist of a
180 * question mark followed by a single letter.
181 * Here we decode that letter and return the appropriate boolean value.
182 */
183 static int
184cond(c, where)
185 char c;
186 int where;
187{
188 POSITION len;
189
190 switch (c)
191 {
192 case 'a': /* Anything in the message yet? */
193 return (mp > message);
194 case 'b': /* Current byte offset known? */
195 return (curr_byte(where) != NULL_POSITION);
196 case 'c':
197 return (hshift != 0);
198 case 'e': /* At end of file? */
199 return (eof_displayed());
200 case 'f': /* Filename known? */
201 return (strcmp(get_filename(curr_ifile), "-") != 0);
202 case 'l': /* Line number known? */
203 case 'd': /* Same as l */
204 return (linenums);
205 case 'L': /* Final line number known? */
206 case 'D': /* Final page number known? */
207 return (linenums && ch_length() != NULL_POSITION);
208 case 'm': /* More than one file? */
209#if TAGS
210 return (ntags() ? (ntags() > 1) : (nifile() > 1));
211#else
212 return (nifile() > 1);
213#endif
214 case 'n': /* First prompt in a new file? */
215#if TAGS
216 return (ntags() ? 1 : new_file);
217#else
218 return (new_file);
219#endif
220 case 'p': /* Percent into file (bytes) known? */
221 return (curr_byte(where) != NULL_POSITION &&
222 ch_length() > 0);
223 case 'P': /* Percent into file (lines) known? */
224 return (currline(where) != 0 &&
225 (len = ch_length()) > 0 &&
226 find_linenum(len) != 0);
227 case 's': /* Size of file known? */
228 case 'B':
229 return (ch_length() != NULL_POSITION);
230 case 'x': /* Is there a "next" file? */
231#if TAGS
232 if (ntags())
233 return (0);
234#endif
235 return (next_ifile(curr_ifile) != NULL_IFILE);
236 }
237 return (0);
238}
239
240/*
241 * Decode a "percent" prototype character.
242 * A prototype string may include various "percent" escapes;
243 * that is, a percent sign followed by a single letter.
244 * Here we decode that letter and take the appropriate action,
245 * usually by appending something to the message being built.
246 */
247 static void
248protochar(c, where, iseditproto)
249 int c;
250 int where;
251 int iseditproto;
252{
253 POSITION pos;
254 POSITION len;
255 int n;
256 LINENUM linenum;
257 LINENUM last_linenum;
258 IFILE h;
259
260#undef PAGE_NUM
261#define PAGE_NUM(linenum) ((((linenum) - 1) / (sc_height - 1)) + 1)
262
263 switch (c)
264 {
265 case 'b': /* Current byte offset */
266 pos = curr_byte(where);
267 if (pos != NULL_POSITION)
268 ap_pos(pos);
269 else
270 ap_quest();
271 break;
272 case 'c':
273 ap_int(hshift);
274 break;
275 case 'd': /* Current page number */
276 linenum = currline(where);
277 if (linenum > 0 && sc_height > 1)
278 ap_linenum(PAGE_NUM(linenum));
279 else
280 ap_quest();
281 break;
282 case 'D': /* Final page number */
283 /* Find the page number of the last byte in the file (len-1). */
284 len = ch_length();
285 if (len == NULL_POSITION)
286 ap_quest();
287 else if (len == 0)
288 /* An empty file has no pages. */
289 ap_linenum(0);
290 else
291 {
292 linenum = find_linenum(len - 1);
293 if (linenum <= 0)
294 ap_quest();
295 else
296 ap_linenum(PAGE_NUM(linenum));
297 }
298 break;
299#if EDITOR
300 case 'E': /* Editor name */
301 ap_str(editor);
302 break;
303#endif
304 case 'f': /* File name */
305 ap_str(get_filename(curr_ifile));
306 break;
| 4 *
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.
7 *
8 * For more information about less, or for information on how to
9 * contact the author, see the README file.
10 */
11
12
13/*
14 * Prompting and other messages.
15 * There are three flavors of prompts, SHORT, MEDIUM and LONG,
16 * selected by the -m/-M options.
17 * There is also the "equals message", printed by the = command.
18 * A prompt is a message composed of various pieces, such as the
19 * name of the file being viewed, the percentage into the file, etc.
20 */
21
22#include "less.h"
23#include "position.h"
24
25extern int pr_type;
26extern int new_file;
27extern int sc_width;
28extern int so_s_width, so_e_width;
29extern int linenums;
30extern int hshift;
31extern int sc_height;
32extern int jump_sline;
33extern int less_is_more;
34extern IFILE curr_ifile;
35#if EDITOR
36extern char *editor;
37extern char *editproto;
38#endif
39
40/*
41 * Prototypes for the three flavors of prompts.
42 * These strings are expanded by pr_expand().
43 */
44static constant char s_proto[] =
45 "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x..%t";
46static constant char m_proto[] =
47 "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t";
48static constant char M_proto[] =
49 "?f%f .?n?m(%T %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t";
50static constant char e_proto[] =
51 "?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t";
52static constant char h_proto[] =
53 "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done";
54static constant char w_proto[] =
55 "Waiting for data";
56static constant char more_proto[] =
57 "--More--(?eEND ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t)";
58
59public char *prproto[3];
60public char constant *eqproto = e_proto;
61public char constant *hproto = h_proto;
62public char constant *wproto = w_proto;
63
64static char message[PROMPT_SIZE];
65static char *mp;
66
67/*
68 * Initialize the prompt prototype strings.
69 */
70 public void
71init_prompt()
72{
73 prproto[0] = save(s_proto);
74 prproto[1] = save(less_is_more ? more_proto : m_proto);
75 prproto[2] = save(M_proto);
76 eqproto = save(e_proto);
77 hproto = save(h_proto);
78 wproto = save(w_proto);
79}
80
81/*
82 * Append a string to the end of the message.
83 */
84 static void
85ap_str(s)
86 char *s;
87{
88 int len;
89
90 len = strlen(s);
91 if (mp + len >= message + PROMPT_SIZE)
92 len = message + PROMPT_SIZE - mp - 1;
93 strncpy(mp, s, len);
94 mp += len;
95 *mp = '\0';
96}
97
98/*
99 * Append a character to the end of the message.
100 */
101 static void
102ap_char(c)
103 char c;
104{
105 char buf[2];
106
107 buf[0] = c;
108 buf[1] = '\0';
109 ap_str(buf);
110}
111
112/*
113 * Append a POSITION (as a decimal integer) to the end of the message.
114 */
115 static void
116ap_pos(pos)
117 POSITION pos;
118{
119 char buf[INT_STRLEN_BOUND(pos) + 2];
120
121 postoa(pos, buf);
122 ap_str(buf);
123}
124
125/*
126 * Append a line number to the end of the message.
127 */
128 static void
129ap_linenum(linenum)
130 LINENUM linenum;
131{
132 char buf[INT_STRLEN_BOUND(linenum) + 2];
133
134 linenumtoa(linenum, buf);
135 ap_str(buf);
136}
137
138/*
139 * Append an integer to the end of the message.
140 */
141 static void
142ap_int(num)
143 int num;
144{
145 char buf[INT_STRLEN_BOUND(num) + 2];
146
147 inttoa(num, buf);
148 ap_str(buf);
149}
150
151/*
152 * Append a question mark to the end of the message.
153 */
154 static void
155ap_quest()
156{
157 ap_str("?");
158}
159
160/*
161 * Return the "current" byte offset in the file.
162 */
163 static POSITION
164curr_byte(where)
165 int where;
166{
167 POSITION pos;
168
169 pos = position(where);
170 while (pos == NULL_POSITION && where >= 0 && where < sc_height-1)
171 pos = position(++where);
172 if (pos == NULL_POSITION)
173 pos = ch_length();
174 return (pos);
175}
176
177/*
178 * Return the value of a prototype conditional.
179 * A prototype string may include conditionals which consist of a
180 * question mark followed by a single letter.
181 * Here we decode that letter and return the appropriate boolean value.
182 */
183 static int
184cond(c, where)
185 char c;
186 int where;
187{
188 POSITION len;
189
190 switch (c)
191 {
192 case 'a': /* Anything in the message yet? */
193 return (mp > message);
194 case 'b': /* Current byte offset known? */
195 return (curr_byte(where) != NULL_POSITION);
196 case 'c':
197 return (hshift != 0);
198 case 'e': /* At end of file? */
199 return (eof_displayed());
200 case 'f': /* Filename known? */
201 return (strcmp(get_filename(curr_ifile), "-") != 0);
202 case 'l': /* Line number known? */
203 case 'd': /* Same as l */
204 return (linenums);
205 case 'L': /* Final line number known? */
206 case 'D': /* Final page number known? */
207 return (linenums && ch_length() != NULL_POSITION);
208 case 'm': /* More than one file? */
209#if TAGS
210 return (ntags() ? (ntags() > 1) : (nifile() > 1));
211#else
212 return (nifile() > 1);
213#endif
214 case 'n': /* First prompt in a new file? */
215#if TAGS
216 return (ntags() ? 1 : new_file);
217#else
218 return (new_file);
219#endif
220 case 'p': /* Percent into file (bytes) known? */
221 return (curr_byte(where) != NULL_POSITION &&
222 ch_length() > 0);
223 case 'P': /* Percent into file (lines) known? */
224 return (currline(where) != 0 &&
225 (len = ch_length()) > 0 &&
226 find_linenum(len) != 0);
227 case 's': /* Size of file known? */
228 case 'B':
229 return (ch_length() != NULL_POSITION);
230 case 'x': /* Is there a "next" file? */
231#if TAGS
232 if (ntags())
233 return (0);
234#endif
235 return (next_ifile(curr_ifile) != NULL_IFILE);
236 }
237 return (0);
238}
239
240/*
241 * Decode a "percent" prototype character.
242 * A prototype string may include various "percent" escapes;
243 * that is, a percent sign followed by a single letter.
244 * Here we decode that letter and take the appropriate action,
245 * usually by appending something to the message being built.
246 */
247 static void
248protochar(c, where, iseditproto)
249 int c;
250 int where;
251 int iseditproto;
252{
253 POSITION pos;
254 POSITION len;
255 int n;
256 LINENUM linenum;
257 LINENUM last_linenum;
258 IFILE h;
259
260#undef PAGE_NUM
261#define PAGE_NUM(linenum) ((((linenum) - 1) / (sc_height - 1)) + 1)
262
263 switch (c)
264 {
265 case 'b': /* Current byte offset */
266 pos = curr_byte(where);
267 if (pos != NULL_POSITION)
268 ap_pos(pos);
269 else
270 ap_quest();
271 break;
272 case 'c':
273 ap_int(hshift);
274 break;
275 case 'd': /* Current page number */
276 linenum = currline(where);
277 if (linenum > 0 && sc_height > 1)
278 ap_linenum(PAGE_NUM(linenum));
279 else
280 ap_quest();
281 break;
282 case 'D': /* Final page number */
283 /* Find the page number of the last byte in the file (len-1). */
284 len = ch_length();
285 if (len == NULL_POSITION)
286 ap_quest();
287 else if (len == 0)
288 /* An empty file has no pages. */
289 ap_linenum(0);
290 else
291 {
292 linenum = find_linenum(len - 1);
293 if (linenum <= 0)
294 ap_quest();
295 else
296 ap_linenum(PAGE_NUM(linenum));
297 }
298 break;
299#if EDITOR
300 case 'E': /* Editor name */
301 ap_str(editor);
302 break;
303#endif
304 case 'f': /* File name */
305 ap_str(get_filename(curr_ifile));
306 break;
|
| 307 case 'F': /* Last component of file name */
308 ap_str(last_component(get_filename(curr_ifile)));
309 break;
|
307 case 'i': /* Index into list of files */
308#if TAGS
309 if (ntags())
310 ap_int(curr_tag());
311 else
312#endif
313 ap_int(get_index(curr_ifile));
314 break;
315 case 'l': /* Current line number */
316 linenum = currline(where);
317 if (linenum != 0)
318 ap_linenum(linenum);
319 else
320 ap_quest();
321 break;
322 case 'L': /* Final line number */
323 len = ch_length();
324 if (len == NULL_POSITION || len == ch_zero() ||
325 (linenum = find_linenum(len)) <= 0)
326 ap_quest();
327 else
328 ap_linenum(linenum-1);
329 break;
330 case 'm': /* Number of files */
331#if TAGS
332 n = ntags();
333 if (n)
334 ap_int(n);
335 else
336#endif
337 ap_int(nifile());
338 break;
339 case 'p': /* Percent into file (bytes) */
340 pos = curr_byte(where);
341 len = ch_length();
342 if (pos != NULL_POSITION && len > 0)
343 ap_int(percentage(pos,len));
344 else
345 ap_quest();
346 break;
347 case 'P': /* Percent into file (lines) */
348 linenum = currline(where);
349 if (linenum == 0 ||
350 (len = ch_length()) == NULL_POSITION || len == ch_zero() ||
351 (last_linenum = find_linenum(len)) <= 0)
352 ap_quest();
353 else
354 ap_int(percentage(linenum, last_linenum));
355 break;
356 case 's': /* Size of file */
357 case 'B':
358 len = ch_length();
359 if (len != NULL_POSITION)
360 ap_pos(len);
361 else
362 ap_quest();
363 break;
364 case 't': /* Truncate trailing spaces in the message */
365 while (mp > message && mp[-1] == ' ')
366 mp--;
| 310 case 'i': /* Index into list of files */
311#if TAGS
312 if (ntags())
313 ap_int(curr_tag());
314 else
315#endif
316 ap_int(get_index(curr_ifile));
317 break;
318 case 'l': /* Current line number */
319 linenum = currline(where);
320 if (linenum != 0)
321 ap_linenum(linenum);
322 else
323 ap_quest();
324 break;
325 case 'L': /* Final line number */
326 len = ch_length();
327 if (len == NULL_POSITION || len == ch_zero() ||
328 (linenum = find_linenum(len)) <= 0)
329 ap_quest();
330 else
331 ap_linenum(linenum-1);
332 break;
333 case 'm': /* Number of files */
334#if TAGS
335 n = ntags();
336 if (n)
337 ap_int(n);
338 else
339#endif
340 ap_int(nifile());
341 break;
342 case 'p': /* Percent into file (bytes) */
343 pos = curr_byte(where);
344 len = ch_length();
345 if (pos != NULL_POSITION && len > 0)
346 ap_int(percentage(pos,len));
347 else
348 ap_quest();
349 break;
350 case 'P': /* Percent into file (lines) */
351 linenum = currline(where);
352 if (linenum == 0 ||
353 (len = ch_length()) == NULL_POSITION || len == ch_zero() ||
354 (last_linenum = find_linenum(len)) <= 0)
355 ap_quest();
356 else
357 ap_int(percentage(linenum, last_linenum));
358 break;
359 case 's': /* Size of file */
360 case 'B':
361 len = ch_length();
362 if (len != NULL_POSITION)
363 ap_pos(len);
364 else
365 ap_quest();
366 break;
367 case 't': /* Truncate trailing spaces in the message */
368 while (mp > message && mp[-1] == ' ')
369 mp--;
|
| 370 *mp = '\0';
|
367 break;
368 case 'T': /* Type of list */
369#if TAGS
370 if (ntags())
371 ap_str("tag");
372 else
373#endif
374 ap_str("file");
375 break;
376 case 'x': /* Name of next file */
377 h = next_ifile(curr_ifile);
378 if (h != NULL_IFILE)
379 ap_str(get_filename(h));
380 else
381 ap_quest();
382 break;
383 }
384}
385
386/*
387 * Skip a false conditional.
388 * When a false condition is found (either a false IF or the ELSE part
389 * of a true IF), this routine scans the prototype string to decide
390 * where to resume parsing the string.
391 * We must keep track of nested IFs and skip them properly.
392 */
393 static char *
394skipcond(p)
395 register char *p;
396{
397 register int iflevel;
398
399 /*
400 * We came in here after processing a ? or :,
401 * so we start nested one level deep.
402 */
403 iflevel = 1;
404
405 for (;;) switch (*++p)
406 {
407 case '?':
408 /*
409 * Start of a nested IF.
410 */
411 iflevel++;
412 break;
413 case ':':
414 /*
415 * Else.
416 * If this matches the IF we came in here with,
417 * then we're done.
418 */
419 if (iflevel == 1)
420 return (p);
421 break;
422 case '.':
423 /*
424 * Endif.
425 * If this matches the IF we came in here with,
426 * then we're done.
427 */
428 if (--iflevel == 0)
429 return (p);
430 break;
431 case '\\':
432 /*
433 * Backslash escapes the next character.
434 */
435 ++p;
436 break;
437 case '\0':
438 /*
439 * Whoops. Hit end of string.
440 * This is a malformed conditional, but just treat it
441 * as if all active conditionals ends here.
442 */
443 return (p-1);
444 }
445 /*NOTREACHED*/
446}
447
448/*
449 * Decode a char that represents a position on the screen.
450 */
451 static char *
452wherechar(p, wp)
453 char *p;
454 int *wp;
455{
456 switch (*p)
457 {
458 case 'b': case 'd': case 'l': case 'p': case 'P':
459 switch (*++p)
460 {
461 case 't': *wp = TOP; break;
462 case 'm': *wp = MIDDLE; break;
463 case 'b': *wp = BOTTOM; break;
464 case 'B': *wp = BOTTOM_PLUS_ONE; break;
465 case 'j': *wp = adjsline(jump_sline); break;
466 default: *wp = TOP; p--; break;
467 }
468 }
469 return (p);
470}
471
472/*
473 * Construct a message based on a prototype string.
474 */
475 public char *
476pr_expand(proto, maxwidth)
477 char *proto;
478 int maxwidth;
479{
480 register char *p;
481 register int c;
482 int where;
483
484 mp = message;
485
486 if (*proto == '\0')
487 return ("");
488
489 for (p = proto; *p != '\0'; p++)
490 {
491 switch (*p)
492 {
493 default: /* Just put the character in the message */
494 ap_char(*p);
495 break;
496 case '\\': /* Backslash escapes the next character */
497 p++;
498 ap_char(*p);
499 break;
500 case '?': /* Conditional (IF) */
501 if ((c = *++p) == '\0')
502 --p;
503 else
504 {
505 where = 0;
506 p = wherechar(p, &where);
507 if (!cond(c, where))
508 p = skipcond(p);
509 }
510 break;
511 case ':': /* ELSE */
512 p = skipcond(p);
513 break;
514 case '.': /* ENDIF */
515 break;
516 case '%': /* Percent escape */
517 if ((c = *++p) == '\0')
518 --p;
519 else
520 {
521 where = 0;
522 p = wherechar(p, &where);
523 protochar(c, where,
524#if EDITOR
525 (proto == editproto));
526#else
527 0);
528#endif
529
530 }
531 break;
532 }
533 }
534
535 if (mp == message)
536 return ("");
537 if (maxwidth > 0 && mp >= message + maxwidth)
538 {
539 /*
540 * Message is too long.
541 * Return just the final portion of it.
542 */
543 return (mp - maxwidth);
544 }
545 return (message);
546}
547
548/*
549 * Return a message suitable for printing by the "=" command.
550 */
551 public char *
552eq_message()
553{
554 return (pr_expand(eqproto, 0));
555}
556
557/*
558 * Return a prompt.
559 * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
560 * If we can't come up with an appropriate prompt, return NULL
561 * and the caller will prompt with a colon.
562 */
563 public char *
564pr_string()
565{
566 char *prompt;
567 int type;
568
569 type = (!less_is_more) ? pr_type : pr_type ? 0 : 1;
570 prompt = pr_expand((ch_getflags() & CH_HELPFILE) ?
571 hproto : prproto[type],
572 sc_width-so_s_width-so_e_width-2);
573 new_file = 0;
574 return (prompt);
575}
576
577/*
578 * Return a message suitable for printing while waiting in the F command.
579 */
580 public char *
581wait_message()
582{
583 return (pr_expand(wproto, sc_width-so_s_width-so_e_width-2));
584}
| 371 break;
372 case 'T': /* Type of list */
373#if TAGS
374 if (ntags())
375 ap_str("tag");
376 else
377#endif
378 ap_str("file");
379 break;
380 case 'x': /* Name of next file */
381 h = next_ifile(curr_ifile);
382 if (h != NULL_IFILE)
383 ap_str(get_filename(h));
384 else
385 ap_quest();
386 break;
387 }
388}
389
390/*
391 * Skip a false conditional.
392 * When a false condition is found (either a false IF or the ELSE part
393 * of a true IF), this routine scans the prototype string to decide
394 * where to resume parsing the string.
395 * We must keep track of nested IFs and skip them properly.
396 */
397 static char *
398skipcond(p)
399 register char *p;
400{
401 register int iflevel;
402
403 /*
404 * We came in here after processing a ? or :,
405 * so we start nested one level deep.
406 */
407 iflevel = 1;
408
409 for (;;) switch (*++p)
410 {
411 case '?':
412 /*
413 * Start of a nested IF.
414 */
415 iflevel++;
416 break;
417 case ':':
418 /*
419 * Else.
420 * If this matches the IF we came in here with,
421 * then we're done.
422 */
423 if (iflevel == 1)
424 return (p);
425 break;
426 case '.':
427 /*
428 * Endif.
429 * If this matches the IF we came in here with,
430 * then we're done.
431 */
432 if (--iflevel == 0)
433 return (p);
434 break;
435 case '\\':
436 /*
437 * Backslash escapes the next character.
438 */
439 ++p;
440 break;
441 case '\0':
442 /*
443 * Whoops. Hit end of string.
444 * This is a malformed conditional, but just treat it
445 * as if all active conditionals ends here.
446 */
447 return (p-1);
448 }
449 /*NOTREACHED*/
450}
451
452/*
453 * Decode a char that represents a position on the screen.
454 */
455 static char *
456wherechar(p, wp)
457 char *p;
458 int *wp;
459{
460 switch (*p)
461 {
462 case 'b': case 'd': case 'l': case 'p': case 'P':
463 switch (*++p)
464 {
465 case 't': *wp = TOP; break;
466 case 'm': *wp = MIDDLE; break;
467 case 'b': *wp = BOTTOM; break;
468 case 'B': *wp = BOTTOM_PLUS_ONE; break;
469 case 'j': *wp = adjsline(jump_sline); break;
470 default: *wp = TOP; p--; break;
471 }
472 }
473 return (p);
474}
475
476/*
477 * Construct a message based on a prototype string.
478 */
479 public char *
480pr_expand(proto, maxwidth)
481 char *proto;
482 int maxwidth;
483{
484 register char *p;
485 register int c;
486 int where;
487
488 mp = message;
489
490 if (*proto == '\0')
491 return ("");
492
493 for (p = proto; *p != '\0'; p++)
494 {
495 switch (*p)
496 {
497 default: /* Just put the character in the message */
498 ap_char(*p);
499 break;
500 case '\\': /* Backslash escapes the next character */
501 p++;
502 ap_char(*p);
503 break;
504 case '?': /* Conditional (IF) */
505 if ((c = *++p) == '\0')
506 --p;
507 else
508 {
509 where = 0;
510 p = wherechar(p, &where);
511 if (!cond(c, where))
512 p = skipcond(p);
513 }
514 break;
515 case ':': /* ELSE */
516 p = skipcond(p);
517 break;
518 case '.': /* ENDIF */
519 break;
520 case '%': /* Percent escape */
521 if ((c = *++p) == '\0')
522 --p;
523 else
524 {
525 where = 0;
526 p = wherechar(p, &where);
527 protochar(c, where,
528#if EDITOR
529 (proto == editproto));
530#else
531 0);
532#endif
533
534 }
535 break;
536 }
537 }
538
539 if (mp == message)
540 return ("");
541 if (maxwidth > 0 && mp >= message + maxwidth)
542 {
543 /*
544 * Message is too long.
545 * Return just the final portion of it.
546 */
547 return (mp - maxwidth);
548 }
549 return (message);
550}
551
552/*
553 * Return a message suitable for printing by the "=" command.
554 */
555 public char *
556eq_message()
557{
558 return (pr_expand(eqproto, 0));
559}
560
561/*
562 * Return a prompt.
563 * This depends on the prompt type (SHORT, MEDIUM, LONG), etc.
564 * If we can't come up with an appropriate prompt, return NULL
565 * and the caller will prompt with a colon.
566 */
567 public char *
568pr_string()
569{
570 char *prompt;
571 int type;
572
573 type = (!less_is_more) ? pr_type : pr_type ? 0 : 1;
574 prompt = pr_expand((ch_getflags() & CH_HELPFILE) ?
575 hproto : prproto[type],
576 sc_width-so_s_width-so_e_width-2);
577 new_file = 0;
578 return (prompt);
579}
580
581/*
582 * Return a message suitable for printing while waiting in the F command.
583 */
584 public char *
585wait_message()
586{
587 return (pr_expand(wproto, sc_width-so_s_width-so_e_width-2));
588}
|