1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
|
/*-
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Michael Rendell of the Memorial University of Newfoundland.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)col.c 8.5 (Berkeley) 5/4/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <locale.h>
#define BS '\b' /* backspace */
#define TAB '\t' /* tab */
#define SPACE ' ' /* space */
#define NL '\n' /* newline */
#define CR '\r' /* carriage return */
#define ESC '\033' /* escape */
#define SI '\017' /* shift in to normal character set */
#define SO '\016' /* shift out to alternate character set */
#define VT '\013' /* vertical tab (aka reverse line feed) */
#define RLF '\007' /* ESC-07 reverse line feed */
#define RHLF '\010' /* ESC-010 reverse half-line feed */
#define FHLF '\011' /* ESC-011 forward half-line feed */
/* build up at least this many lines before flushing them out */
#define BUFFER_MARGIN 32
typedef char CSET;
typedef struct char_str {
#define CS_NORMAL 1
#define CS_ALTERNATE 2
short c_column; /* column character is in */
CSET c_set; /* character set (currently only 2) */
char c_char; /* character in question */
} CHAR;
typedef struct line_str LINE;
struct line_str {
CHAR *l_line; /* characters on the line */
LINE *l_prev; /* previous line */
LINE *l_next; /* next line */
int l_lsize; /* allocated sizeof l_line */
int l_line_len; /* strlen(l_line) */
int l_needs_sort; /* set if chars went in out of order */
int l_max_col; /* max column in the line */
};
LINE *alloc_line __P((void));
void dowarn __P((int));
void flush_line __P((LINE *));
void flush_lines __P((int));
void flush_blanks __P((void));
void free_line __P((LINE *));
void usage __P((void));
void wrerr __P((void));
void *xmalloc __P((void *, size_t));
CSET last_set; /* char_set of last char printed */
LINE *lines;
int compress_spaces; /* if doing space -> tab conversion */
int fine; /* if `fine' resolution (half lines) */
int max_bufd_lines; /* max # lines to keep in memory */
int nblank_lines; /* # blanks after last flushed line */
int no_backspaces; /* if not to output any backspaces */
#define PUTC(ch) \
do { \
if (putchar(ch) == EOF) \
wrerr(); \
} while (0)
int
main(argc, argv)
int argc;
char **argv;
{
int ch;
CHAR *c;
CSET cur_set; /* current character set */
LINE *l; /* current line */
int extra_lines; /* # of lines above first line */
int cur_col; /* current column */
int cur_line; /* line number of current position */
int max_line; /* max value of cur_line */
int this_line; /* line l points to */
int nflushd_lines; /* number of lines that were flushed */
int adjust, opt, warned;
(void) setlocale(LC_CTYPE, "");
max_bufd_lines = 128;
compress_spaces = 1; /* compress spaces into tabs */
while ((opt = getopt(argc, argv, "bfhl:x")) != -1)
switch (opt) {
case 'b': /* do not output backspaces */
no_backspaces = 1;
break;
case 'f': /* allow half forward line feeds */
fine = 1;
break;
case 'h': /* compress spaces into tabs */
compress_spaces = 1;
break;
case 'l': /* buffered line count */
if ((max_bufd_lines = atoi(optarg)) <= 0)
errx(1, "bad -l argument %s", optarg);
break;
case 'x': /* do not compress spaces into tabs */
compress_spaces = 0;
break;
case '?':
default:
usage();
}
if (optind != argc)
usage();
/* this value is in half lines */
max_bufd_lines *= 2;
adjust = cur_col = extra_lines = warned = 0;
cur_line = max_line = nflushd_lines = this_line = 0;
cur_set = last_set = CS_NORMAL;
lines = l = alloc_line();
while ((ch = getchar()) != EOF) {
if (!isgraph(ch)) {
switch (ch) {
case BS: /* can't go back further */
if (cur_col == 0)
continue;
--cur_col;
continue;
case CR:
cur_col = 0;
continue;
case ESC: /* just ignore EOF */
switch(getchar()) {
case RLF:
cur_line -= 2;
break;
case RHLF:
cur_line--;
break;
case FHLF:
cur_line++;
if (cur_line > max_line)
max_line = cur_line;
}
continue;
case NL:
cur_line += 2;
if (cur_line > max_line)
max_line = cur_line;
cur_col = 0;
continue;
case SPACE:
++cur_col;
continue;
case SI:
cur_set = CS_NORMAL;
continue;
case SO:
cur_set = CS_ALTERNATE;
continue;
case TAB: /* adjust column */
cur_col |= 7;
++cur_col;
continue;
case VT:
cur_line -= 2;
continue;
}
continue;
}
/* Must stuff ch in a line - are we at the right one? */
if (cur_line != this_line - adjust) {
LINE *lnew;
int nmove;
adjust = 0;
nmove = cur_line - this_line;
if (!fine) {
/* round up to next line */
if (cur_line & 1) {
adjust = 1;
nmove++;
}
}
if (nmove < 0) {
for (; nmove < 0 && l->l_prev; nmove++)
l = l->l_prev;
if (nmove) {
if (nflushd_lines == 0) {
/*
* Allow backup past first
* line if nothing has been
* flushed yet.
*/
for (; nmove < 0; nmove++) {
lnew = alloc_line();
l->l_prev = lnew;
lnew->l_next = l;
l = lines = lnew;
extra_lines++;
}
} else {
if (!warned++)
dowarn(cur_line);
cur_line -= nmove;
}
}
} else {
/* may need to allocate here */
for (; nmove > 0 && l->l_next; nmove--)
l = l->l_next;
for (; nmove > 0; nmove--) {
lnew = alloc_line();
lnew->l_prev = l;
l->l_next = lnew;
l = lnew;
}
}
this_line = cur_line + adjust;
nmove = this_line - nflushd_lines;
if (nmove >= max_bufd_lines + BUFFER_MARGIN) {
nflushd_lines += nmove - max_bufd_lines;
flush_lines(nmove - max_bufd_lines);
}
}
/* grow line's buffer? */
if (l->l_line_len + 1 >= l->l_lsize) {
int need;
need = l->l_lsize ? l->l_lsize * 2 : 90;
l->l_line = (CHAR *)xmalloc((void *) l->l_line,
(unsigned) need * sizeof(CHAR));
l->l_lsize = need;
}
c = &l->l_line[l->l_line_len++];
c->c_char = ch;
c->c_set = cur_set;
c->c_column = cur_col;
/*
* If things are put in out of order, they will need sorting
* when it is flushed.
*/
if (cur_col < l->l_max_col)
l->l_needs_sort = 1;
else
l->l_max_col = cur_col;
cur_col++;
}
if (max_line == 0)
exit(0); /* no lines, so just exit */
/* goto the last line that had a character on it */
for (; l->l_next; l = l->l_next)
this_line++;
flush_lines(this_line - nflushd_lines + extra_lines + 1);
/* make sure we leave things in a sane state */
if (last_set != CS_NORMAL)
PUTC('\017');
/* flush out the last few blank lines */
nblank_lines = max_line - this_line;
if (max_line & 1)
nblank_lines++;
else if (!nblank_lines)
/* missing a \n on the last line? */
nblank_lines = 2;
flush_blanks();
exit(0);
}
void
flush_lines(nflush)
int nflush;
{
LINE *l;
while (--nflush >= 0) {
l = lines;
lines = l->l_next;
if (l->l_line) {
flush_blanks();
flush_line(l);
}
nblank_lines++;
if (l->l_line)
(void)free((void *)l->l_line);
free_line(l);
}
if (lines)
lines->l_prev = NULL;
}
/*
* Print a number of newline/half newlines. If fine flag is set, nblank_lines
* is the number of half line feeds, otherwise it is the number of whole line
* feeds.
*/
void
flush_blanks()
{
int half, i, nb;
half = 0;
nb = nblank_lines;
if (nb & 1) {
if (fine)
half = 1;
else
nb++;
}
nb /= 2;
for (i = nb; --i >= 0;)
PUTC('\n');
if (half) {
PUTC('\033');
PUTC('9');
if (!nb)
PUTC('\r');
}
nblank_lines = 0;
}
/*
* Write a line to stdout taking care of space to tab conversion (-h flag)
* and character set shifts.
*/
void
flush_line(l)
LINE *l;
{
CHAR *c, *endc;
int nchars, last_col, this_col;
last_col = 0;
nchars = l->l_line_len;
if (l->l_needs_sort) {
static CHAR *sorted;
static int count_size, *count, i, save, sorted_size, tot;
/*
* Do an O(n) sort on l->l_line by column being careful to
* preserve the order of characters in the same column.
*/
if (l->l_lsize > sorted_size) {
sorted_size = l->l_lsize;
sorted = (CHAR *)xmalloc((void *)sorted,
(unsigned)sizeof(CHAR) * sorted_size);
}
if (l->l_max_col >= count_size) {
count_size = l->l_max_col + 1;
count = (int *)xmalloc((void *)count,
(unsigned)sizeof(int) * count_size);
}
memset((char *)count, 0, sizeof(int) * l->l_max_col + 1);
for (i = nchars, c = l->l_line; --i >= 0; c++)
count[c->c_column]++;
/*
* calculate running total (shifted down by 1) to use as
* indices into new line.
*/
for (tot = 0, i = 0; i <= l->l_max_col; i++) {
save = count[i];
count[i] = tot;
tot += save;
}
for (i = nchars, c = l->l_line; --i >= 0; c++)
sorted[count[c->c_column]++] = *c;
c = sorted;
} else
c = l->l_line;
while (nchars > 0) {
this_col = c->c_column;
endc = c;
do {
++endc;
} while (--nchars > 0 && this_col == endc->c_column);
/* if -b only print last character */
if (no_backspaces)
c = endc - 1;
if (this_col > last_col) {
int nspace = this_col - last_col;
if (compress_spaces && nspace > 1) {
while (1) {
int tab_col, tab_size;;
tab_col = (last_col + 8) & ~7;
if (tab_col > this_col)
break;
tab_size = tab_col - last_col;
if (tab_size == 1)
PUTC(' ');
else
PUTC('\t');
nspace -= tab_size;
last_col = tab_col;
}
}
while (--nspace >= 0)
PUTC(' ');
last_col = this_col;
}
last_col++;
for (;;) {
if (c->c_set != last_set) {
switch (c->c_set) {
case CS_NORMAL:
PUTC('\017');
break;
case CS_ALTERNATE:
PUTC('\016');
}
last_set = c->c_set;
}
PUTC(c->c_char);
if (++c >= endc)
break;
PUTC('\b');
}
}
}
#define NALLOC 64
static LINE *line_freelist;
LINE *
alloc_line()
{
LINE *l;
int i;
if (!line_freelist) {
l = (LINE *)xmalloc((void *)NULL, sizeof(LINE) * NALLOC);
line_freelist = l;
for (i = 1; i < NALLOC; i++, l++)
l->l_next = l + 1;
l->l_next = NULL;
}
l = line_freelist;
line_freelist = l->l_next;
memset(l, 0, sizeof(LINE));
return (l);
}
void
free_line(l)
LINE *l;
{
l->l_next = line_freelist;
line_freelist = l;
}
void *
xmalloc(p, size)
void *p;
size_t size;
{
if (!(p = (void *)realloc(p, size)))
err(1, NULL);
return (p);
}
void
usage()
{
(void)fprintf(stderr, "usage: col [-bfhx] [-l nline]\n");
exit(1);
}
void
wrerr()
{
errx(1, "write error");
}
void
dowarn(line)
int line;
{
warnx("warning: can't back up %s",
line < 0 ? "past first line" : "-- line already flushed");
}
|