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vm: change NO_MEM to a more impossible value
[minix.git] / usr.bin / indent / pr_comment.c
blob10f8d38c83d85a9332fafac79c37660b036b9c59
1 /* $NetBSD: pr_comment.c,v 1.9 2003/08/07 11:14:09 agc Exp $ */
2
3 /*
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1976 Board of Trustees of the University of Illinois.
34 * Copyright (c) 1985 Sun Microsystems, Inc.
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 */
65
66 #include <sys/cdefs.h>
67 #ifndef lint
68 #if 0
69 static char sccsid[] = "@(#)pr_comment.c 8.1 (Berkeley) 6/6/93";
70 #else
71 __RCSID("$NetBSD: pr_comment.c,v 1.9 2003/08/07 11:14:09 agc Exp $");
72 #endif
73 #endif /* not lint */
74
75 #include <stdio.h>
76 #include <stdlib.h>
77 #include <ctype.h>
78 #include "indent_globs.h"
79
80 /*
81 * NAME:
82 * pr_comment
83 *
84 * FUNCTION:
85 * This routine takes care of scanning and printing comments.
86 *
87 * ALGORITHM:
88 * 1) Decide where the comment should be aligned, and if lines should
89 * be broken.
90 * 2) If lines should not be broken and filled, just copy up to end of
91 * comment.
92 * 3) If lines should be filled, then scan thru input_buffer copying
93 * characters to com_buf. Remember where the last blank, tab, or
94 * newline was. When line is filled, print up to last blank and
95 * continue copying.
96 *
97 * HISTORY:
98 * November 1976 D A Willcox of CAC Initial coding
99 * 12/6/76 D A Willcox of CAC Modification to handle
100 * UNIX-style comments
101 *
102 */\f
103
104 /*
105 * this routine processes comments. It makes an attempt to keep comments from
106 * going over the max line length. If a line is too long, it moves everything
107 * from the last blank to the next comment line. Blanks and tabs from the
108 * beginning of the input line are removed
109 */
110
111
112 void
113 pr_comment(void)
114 {
115 int now_col; /* column we are in now */
116 int adj_max_col; /* Adjusted max_col for when we decide to
117 * spill comments over the right margin */
118 char *last_bl; /* points to the last blank in the output
119 * buffer */
120 char *t_ptr; /* used for moving string */
121 int unix_comment; /* tri-state variable used to decide if it is
122 * a unix-style comment. 0 means only blanks
123 * since start, 1 means regular style comment,
124 * 2 means unix style comment */
125 int break_delim = comment_delimiter_on_blankline;
126 int l_just_saw_decl = ps.just_saw_decl;
127 /*
128 * int ps.last_nl = 0; / * true iff the last significant thing
129 * weve seen is a newline
130 */
131 int one_liner = 1; /* true iff this comment is a one-liner */
132 adj_max_col = max_col;
133 ps.just_saw_decl = 0;
134 last_bl = 0; /* no blanks found so far */
135 ps.box_com = false; /* at first, assume that we are not in a boxed
136 * comment or some other comment that should
137 * not be touched */
138 ++ps.out_coms; /* keep track of number of comments */
139 unix_comment = 1; /* set flag to let us figure out if there is a
140 * unix-style comment ** DISABLED: use 0 to
141 * reenable this hack! */
142
143 /* Figure where to align and how to treat the comment */
144
145 if (ps.col_1 && !format_col1_comments) { /* if comment starts in
146 * column 1 it should
147 * not be touched */
148 ps.box_com = true;
149 ps.com_col = 1;
150 } else {
151 if (*buf_ptr == '-' || *buf_ptr == '*' || *buf_ptr == '\n') {
152 ps.box_com = true; /* a comment with a '-', '*'
153 * or newline immediately
154 * after the start comment is
155 * assumed to be a boxed
156 * comment */
157 break_delim = 0;
158 }
159 if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
160 /* klg: check only if this line is blank */
161 /*
162 * If this (*and previous lines are*) blank, dont put comment way
163 * out at left
164 */
165 ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
166 adj_max_col = block_comment_max_col;
167 if (ps.com_col <= 1)
168 ps.com_col = 1 + !format_col1_comments;
169 } else {
170 int target_col;
171 break_delim = 0;
172 if (s_code != e_code)
173 target_col = count_spaces(compute_code_target(), s_code);
174 else {
175 target_col = 1;
176 if (s_lab != e_lab)
177 target_col = count_spaces(compute_label_target(), s_lab);
178 }
179 ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
180 if (ps.com_col < target_col)
181 ps.com_col = ((target_col + 7) & ~7) + 1;
182 if (ps.com_col + 24 > adj_max_col)
183 adj_max_col = ps.com_col + 24;
184 }
185 }
186 if (ps.box_com) {
187 buf_ptr[-2] = 0;
188 ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
189 buf_ptr[-2] = '/';
190 } else {
191 ps.n_comment_delta = 0;
192 while (*buf_ptr == ' ' || *buf_ptr == '\t')
193 buf_ptr++;
194 }
195 ps.comment_delta = 0;
196 *e_com++ = '/'; /* put '/' + '*' into buffer */
197 *e_com++ = '*';
198 if (*buf_ptr != ' ' && !ps.box_com)
199 *e_com++ = ' ';
200
201 *e_com = '\0';
202 if (troff) {
203 now_col = 1;
204 adj_max_col = 80;
205 } else
206 now_col = count_spaces(ps.com_col, s_com); /* figure what column we
207 * would be in if we
208 * printed the comment
209 * now */
210
211 /* Start to copy the comment */
212
213 while (1) { /* this loop will go until the comment is
214 * copied */
215 if (!iscntrl((unsigned char)*buf_ptr) && *buf_ptr != '*')
216 ps.last_nl = 0;
217 CHECK_SIZE_COM;
218 switch (*buf_ptr) { /* this checks for various spcl cases */
219 case 014: /* check for a form feed */
220 if (!ps.box_com) { /* in a text comment, break
221 * the line here */
222 ps.use_ff = true;
223 /* fix so dump_line uses a form feed */
224 dump_line();
225 last_bl = 0;
226 *e_com++ = ' ';
227 *e_com++ = '*';
228 *e_com++ = ' ';
229 while (*++buf_ptr == ' ' || *buf_ptr == '\t');
230 } else {
231 if (++buf_ptr >= buf_end)
232 fill_buffer();
233 *e_com++ = 014;
234 }
235 break;
236
237 case '\n':
238 if (had_eof) { /* check for unexpected eof */
239 printf("Unterminated comment\n");
240 *e_com = '\0';
241 dump_line();
242 return;
243 }
244 one_liner = 0;
245 if (ps.box_com || ps.last_nl) { /* if this is a boxed
246 * comment, we dont
247 * ignore the newline */
248 if (s_com == e_com) {
249 *e_com++ = ' ';
250 *e_com++ = ' ';
251 }
252 *e_com = '\0';
253 if (!ps.box_com && e_com - s_com > 3) {
254 if (break_delim == 1 && s_com[0] == '/'
255 && s_com[1] == '*' && s_com[2] == ' ') {
256 char *t = e_com;
257 break_delim = 2;
258 e_com = s_com + 2;
259 *e_com = 0;
260 if (blanklines_before_blockcomments)
261 prefix_blankline_requested = 1;
262 dump_line();
263 e_com = t;
264 s_com[0] = s_com[1] = s_com[2] = ' ';
265 }
266 dump_line();
267 CHECK_SIZE_COM;
268 *e_com++ = ' ';
269 *e_com++ = ' ';
270 }
271 dump_line();
272 now_col = ps.com_col;
273 } else {
274 ps.last_nl = 1;
275 if (unix_comment != 1) { /* we not are in
276 * unix_style comment */
277 if (unix_comment == 0 && s_code == e_code) {
278 /*
279 * if it is a UNIX-style comment, ignore the
280 * requirement that previous line be blank for
281 * unindention
282 */
283 ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
284 if (ps.com_col <= 1)
285 ps.com_col = 2;
286 }
287 unix_comment = 2; /* permanently remember
288 * that we are in this
289 * type of comment */
290 dump_line();
291 ++line_no;
292 now_col = ps.com_col;
293 *e_com++ = ' ';
294 /*
295 * fix so that the star at the start of the line will line
296 * up
297 */
298 do /* flush leading white space */
299 if (++buf_ptr >= buf_end)
300 fill_buffer();
301 while (*buf_ptr == ' ' || *buf_ptr == '\t');
302 break;
303 }
304 if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
305 last_bl = e_com - 1;
306 /*
307 * if there was a space at the end of the last line, remember
308 * where it was
309 */
310 else { /* otherwise, insert one */
311 last_bl = e_com;
312 CHECK_SIZE_COM;
313 *e_com++ = ' ';
314 ++now_col;
315 }
316 }
317 ++line_no; /* keep track of input line number */
318 if (!ps.box_com) {
319 int nstar = 1;
320 do { /* flush any blanks and/or tabs at
321 * start of next line */
322 if (++buf_ptr >= buf_end)
323 fill_buffer();
324 if (*buf_ptr == '*' && --nstar >= 0) {
325 if (++buf_ptr >= buf_end)
326 fill_buffer();
327 if (*buf_ptr == '/')
328 goto end_of_comment;
329 }
330 } while (*buf_ptr == ' ' || *buf_ptr == '\t');
331 } else
332 if (++buf_ptr >= buf_end)
333 fill_buffer();
334 break; /* end of case for newline */
335
336 case '*': /* must check for possibility of being at end
337 * of comment */
338 if (++buf_ptr >= buf_end) /* get to next char
339 * after * */
340 fill_buffer();
341
342 if (unix_comment == 0) /* set flag to show we are not
343 * in unix-style comment */
344 unix_comment = 1;
345
346 if (*buf_ptr == '/') { /* it is the end!!! */
347 end_of_comment:
348 if (++buf_ptr >= buf_end)
349 fill_buffer();
350
351 if (*(e_com - 1) != ' ' && !ps.box_com) { /* insure blank before
352 * end */
353 *e_com++ = ' ';
354 ++now_col;
355 }
356 if (break_delim == 1 && !one_liner && s_com[0] == '/'
357 && s_com[1] == '*' && s_com[2] == ' ') {
358 char *t = e_com;
359 break_delim = 2;
360 e_com = s_com + 2;
361 *e_com = 0;
362 if (blanklines_before_blockcomments)
363 prefix_blankline_requested = 1;
364 dump_line();
365 e_com = t;
366 s_com[0] = s_com[1] = s_com[2] = ' ';
367 }
368 if (break_delim == 2 && e_com > s_com + 3
369 /* now_col > adj_max_col - 2 && !ps.box_com */ ) {
370 *e_com = '\0';
371 dump_line();
372 now_col = ps.com_col;
373 }
374 CHECK_SIZE_COM;
375 *e_com++ = '*';
376 *e_com++ = '/';
377 *e_com = '\0';
378 ps.just_saw_decl = l_just_saw_decl;
379 return;
380 } else {/* handle isolated '*' */
381 *e_com++ = '*';
382 ++now_col;
383 }
384 break;
385 default: /* we have a random char */
386 if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
387 unix_comment = 1; /* we are not in
388 * unix-style comment */
389
390 *e_com = *buf_ptr++;
391 if (buf_ptr >= buf_end)
392 fill_buffer();
393
394 if (*e_com == '\t') /* keep track of column */
395 now_col = ((now_col - 1) & tabmask) + tabsize + 1;
396 else
397 if (*e_com == '\b') /* this is a backspace */
398 --now_col;
399 else
400 ++now_col;
401
402 if (*e_com == ' ' || *e_com == '\t')
403 last_bl = e_com;
404 /* remember we saw a blank */
405
406 ++e_com;
407 if (now_col > adj_max_col && !ps.box_com && unix_comment == 1
408 && !iscntrl((unsigned char)e_com[-1])
409 && !isblank((unsigned char)e_com[-1])) {
410 /*
411 * the comment is too long, it must be broken up
412 */
413 if (break_delim == 1 && s_com[0] == '/'
414 && s_com[1] == '*' && s_com[2] == ' ') {
415 char *t = e_com;
416 break_delim = 2;
417 e_com = s_com + 2;
418 *e_com = 0;
419 if (blanklines_before_blockcomments)
420 prefix_blankline_requested = 1;
421 dump_line();
422 e_com = t;
423 s_com[0] = s_com[1] = s_com[2] = ' ';
424 }
425 if (last_bl == 0) { /* we have seen no
426 * blanks */
427 last_bl = e_com; /* fake it */
428 *e_com++ = ' ';
429 }
430 *e_com = '\0'; /* print what we have */
431 *last_bl = '\0';
432 while (last_bl > s_com && iscntrl((unsigned char)last_bl[-1]) )
433 *--last_bl = 0;
434 e_com = last_bl;
435 dump_line();
436
437 *e_com++ = ' '; /* add blanks for continuation */
438 *e_com++ = ' ';
439 *e_com++ = ' ';
440
441 t_ptr = last_bl + 1;
442 last_bl = 0;
443 if (t_ptr >= e_com) {
444 while (*t_ptr == ' ' || *t_ptr == '\t')
445 t_ptr++;
446 while (*t_ptr != '\0') { /* move unprinted part
447 * of comment down in
448 * buffer */
449 if (*t_ptr == ' ' || *t_ptr == '\t')
450 last_bl = e_com;
451 *e_com++ = *t_ptr++;
452 }
453 }
454 *e_com = '\0';
455 now_col = count_spaces(ps.com_col, s_com); /* recompute current
456 * position */
457 }
458 break;
459 }
460 }
461 }
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