summaryrefslogtreecommitdiff
path: root/src/nl.c
blob: c133f2562fc29fcc907bb96d869e00b76f9607bd (plain)
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
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
/* nl -- number lines of files
   Copyright (C) 89, 92, 1995-2005 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Written by Scott Bartram (nancy!scott@uunet.uu.net)
   Revised by David MacKenzie (djm@gnu.ai.mit.edu) */

#include <config.h>

#include <stdio.h>
#include <sys/types.h>
#include <getopt.h>

#include "system.h"

#include <regex.h>

#include "error.h"
#include "linebuffer.h"
#include "quote.h"
#include "xstrtol.h"

/* The official name of this program (e.g., no `g' prefix).  */
#define PROGRAM_NAME "nl"

#define AUTHORS "Scott Bartram", "David MacKenzie"

/* Line-number formats.  They are given an int width, an intmax_t
   value, and a string separator.  */

/* Right justified, no leading zeroes.  */
static char const FORMAT_RIGHT_NOLZ[] = "%*" PRIdMAX "%s";

/* Right justified, leading zeroes.  */
static char const FORMAT_RIGHT_LZ[] = "%0*" PRIdMAX "%s";

/* Left justified, no leading zeroes.  */
static char const FORMAT_LEFT[] = "%-*" PRIdMAX "%s";

/* Default section delimiter characters.  */
static char const DEFAULT_SECTION_DELIMITERS[] = "\\:";

/* Types of input lines: either one of the section delimiters,
   or text to output. */
enum section
{
  Header, Body, Footer, Text
};

/* The name this program was run with. */
char *program_name;

/* Format of body lines (-b).  */
static char *body_type = "t";

/* Format of header lines (-h).  */
static char *header_type = "n";

/* Format of footer lines (-f).  */
static char *footer_type = "n";

/* Format currently being used (body, header, or footer).  */
static char *current_type;

/* Regex for body lines to number (-bp).  */
static struct re_pattern_buffer body_regex;

/* Regex for header lines to number (-hp).  */
static struct re_pattern_buffer header_regex;

/* Regex for footer lines to number (-fp).  */
static struct re_pattern_buffer footer_regex;

/* Pointer to current regex, if any.  */
static struct re_pattern_buffer *current_regex = NULL;

/* Separator string to print after line number (-s).  */
static char *separator_str = "\t";

/* Input section delimiter string (-d).  */
static char const *section_del = DEFAULT_SECTION_DELIMITERS;

/* Header delimiter string.  */
static char *header_del = NULL;

/* Header section delimiter length.  */
static size_t header_del_len;

/* Body delimiter string.  */
static char *body_del = NULL;

/* Body section delimiter length.  */
static size_t body_del_len;

/* Footer delimiter string.  */
static char *footer_del = NULL;

/* Footer section delimiter length.  */
static size_t footer_del_len;

/* Input buffer.  */
static struct linebuffer line_buf;

/* printf format string for unnumbered lines.  */
static char *print_no_line_fmt = NULL;

/* Starting line number on each page (-v).  */
static intmax_t starting_line_number = 1;

/* Line number increment (-i).  */
static intmax_t page_incr = 1;

/* If true, reset line number at start of each page (-p).  */
static bool reset_numbers = true;

/* Number of blank lines to consider to be one line for numbering (-l).  */
static intmax_t blank_join = 1;

/* Width of line numbers (-w).  */
static int lineno_width = 6;

/* Line number format (-n).  */
static char const *lineno_format = FORMAT_RIGHT_NOLZ;

/* Current print line number.  */
static intmax_t line_no;

/* True if we have ever read standard input.  */
static bool have_read_stdin;

static struct option const longopts[] =
{
  {"header-numbering", required_argument, NULL, 'h'},
  {"body-numbering", required_argument, NULL, 'b'},
  {"footer-numbering", required_argument, NULL, 'f'},
  {"starting-line-number", required_argument, NULL, 'v'},
  {"page-increment", required_argument, NULL, 'i'},
  {"no-renumber", no_argument, NULL, 'p'},
  {"join-blank-lines", required_argument, NULL, 'l'},
  {"number-separator", required_argument, NULL, 's'},
  {"number-width", required_argument, NULL, 'w'},
  {"number-format", required_argument, NULL, 'n'},
  {"section-delimiter", required_argument, NULL, 'd'},
  {GETOPT_HELP_OPTION_DECL},
  {GETOPT_VERSION_OPTION_DECL},
  {NULL, 0, NULL, 0}
};

/* Print a usage message and quit. */

void
usage (int status)
{
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s [OPTION]... [FILE]...\n\
"),
	      program_name);
      fputs (_("\
Write each FILE to standard output, with line numbers added.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
"), stdout);
      fputs (_("\
Mandatory arguments to long options are mandatory for short options too.\n\
"), stdout);
      fputs (_("\
  -b, --body-numbering=STYLE      use STYLE for numbering body lines\n\
  -d, --section-delimiter=CC      use CC for separating logical pages\n\
  -f, --footer-numbering=STYLE    use STYLE for numbering footer lines\n\
"), stdout);
      fputs (_("\
  -h, --header-numbering=STYLE    use STYLE for numbering header lines\n\
  -i, --page-increment=NUMBER     line number increment at each line\n\
  -l, --join-blank-lines=NUMBER   group of NUMBER empty lines counted as one\n\
  -n, --number-format=FORMAT      insert line numbers according to FORMAT\n\
  -p, --no-renumber               do not reset line numbers at logical pages\n\
  -s, --number-separator=STRING   add STRING after (possible) line number\n\
"), stdout);
      fputs (_("\
  -v, --first-page=NUMBER         first line number on each logical page\n\
  -w, --number-width=NUMBER       use NUMBER columns for line numbers\n\
"), stdout);
      fputs (HELP_OPTION_DESCRIPTION, stdout);
      fputs (VERSION_OPTION_DESCRIPTION, stdout);
      fputs (_("\
\n\
By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn.  CC are\n\
two delimiter characters for separating logical pages, a missing\n\
second character implies :.  Type \\\\ for \\.  STYLE is one of:\n\
"), stdout);
      fputs (_("\
\n\
  a         number all lines\n\
  t         number only nonempty lines\n\
  n         number no lines\n\
  pBRE      number only lines that contain a match for the basic regular\n\
              expression, BRE\n\
\n\
FORMAT is one of:\n\
\n\
  ln   left justified, no leading zeros\n\
  rn   right justified, no leading zeros\n\
  rz   right justified, leading zeros\n\
\n\
"), stdout);
      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    }
  exit (status);
}

/* Set the command line flag TYPEP and possibly the regex pointer REGEXP,
   according to `optarg'.  */

static bool
build_type_arg (char **typep, struct re_pattern_buffer *regexp)
{
  const char *errmsg;
  bool rval = true;
  size_t optlen;

  switch (*optarg)
    {
    case 'a':
    case 't':
    case 'n':
      *typep = optarg;
      break;
    case 'p':
      *typep = optarg++;
      optlen = strlen (optarg);
      regexp->allocated = optlen * 2;
      regexp->buffer = xnmalloc (optlen, 2);
      regexp->translate = NULL;
      regexp->fastmap = xmalloc (256);
      regexp->fastmap_accurate = 0;
      errmsg = re_compile_pattern (optarg, optlen, regexp);
      if (errmsg)
	error (EXIT_FAILURE, 0, "%s", errmsg);
      break;
    default:
      rval = false;
      break;
    }
  return rval;
}

/* Print the line number and separator; increment the line number. */

static void
print_lineno (void)
{
  intmax_t next_line_no;

  printf (lineno_format, lineno_width, line_no, separator_str);

  next_line_no = line_no + page_incr;
  if (next_line_no < line_no)
    error (EXIT_FAILURE, 0, _("line number overflow"));
  line_no = next_line_no;
}

/* Switch to a header section. */

static void
proc_header (void)
{
  current_type = header_type;
  current_regex = &header_regex;
  if (reset_numbers)
    line_no = starting_line_number;
  putchar ('\n');
}

/* Switch to a body section. */

static void
proc_body (void)
{
  current_type = body_type;
  current_regex = &body_regex;
  putchar ('\n');
}

/* Switch to a footer section. */

static void
proc_footer (void)
{
  current_type = footer_type;
  current_regex = &footer_regex;
  putchar ('\n');
}

/* Process a regular text line in `line_buf'. */

static void
proc_text (void)
{
  static intmax_t blank_lines = 0;	/* Consecutive blank lines so far. */

  switch (*current_type)
    {
    case 'a':
      if (blank_join > 1)
	{
	  if (1 < line_buf.length || ++blank_lines == blank_join)
	    {
	      print_lineno ();
	      blank_lines = 0;
	    }
	  else
	    fputs (print_no_line_fmt, stdout);
	}
      else
	print_lineno ();
      break;
    case 't':
      if (1 < line_buf.length)
	print_lineno ();
      else
	fputs (print_no_line_fmt, stdout);
      break;
    case 'n':
      fputs (print_no_line_fmt, stdout);
      break;
    case 'p':
      switch (re_search (current_regex, line_buf.buffer, line_buf.length - 1,
			 0, line_buf.length - 1, (struct re_registers *) 0))
	{
	case -2:
	  error (EXIT_FAILURE, errno, _("error in regular expression search"));

	case -1:
	  fputs (print_no_line_fmt, stdout);
	  break;

	default:
	  print_lineno ();
	  break;
	}
    }
  fwrite (line_buf.buffer, sizeof (char), line_buf.length, stdout);
}

/* Return the type of line in `line_buf'. */

static enum section
check_section (void)
{
  size_t len = line_buf.length - 1;

  if (len < 2 || memcmp (line_buf.buffer, section_del, 2))
    return Text;
  if (len == header_del_len
      && !memcmp (line_buf.buffer, header_del, header_del_len))
    return Header;
  if (len == body_del_len
      && !memcmp (line_buf.buffer, body_del, body_del_len))
    return Body;
  if (len == footer_del_len
      && !memcmp (line_buf.buffer, footer_del, footer_del_len))
    return Footer;
  return Text;
}

/* Read and process the file pointed to by FP. */

static void
process_file (FILE *fp)
{
  while (readlinebuffer (&line_buf, fp))
    {
      switch (check_section ())
	{
	case Header:
	  proc_header ();
	  break;
	case Body:
	  proc_body ();
	  break;
	case Footer:
	  proc_footer ();
	  break;
	case Text:
	  proc_text ();
	  break;
	}
    }
}

/* Process file FILE to standard output.
   Return true if successful.  */

static bool
nl_file (const char *file)
{
  FILE *stream;

  if (STREQ (file, "-"))
    {
      have_read_stdin = true;
      stream = stdin;
    }
  else
    {
      stream = fopen (file, "r");
      if (stream == NULL)
	{
	  error (0, errno, "%s", file);
	  return false;
	}
    }

  process_file (stream);

  if (ferror (stream))
    {
      error (0, errno, "%s", file);
      return false;
    }
  if (STREQ (file, "-"))
    clearerr (stream);		/* Also clear EOF. */
  else if (fclose (stream) == EOF)
    {
      error (0, errno, "%s", file);
      return false;
    }
  return true;
}

int
main (int argc, char **argv)
{
  int c;
  size_t len;
  bool ok = true;

  initialize_main (&argc, &argv);
  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  atexit (close_stdout);

  have_read_stdin = false;

  while ((c = getopt_long (argc, argv, "h:b:f:v:i:pl:s:w:n:d:", longopts,
			   NULL)) != -1)
    {
      switch (c)
	{
	case 'h':
	  if (! build_type_arg (&header_type, &header_regex))
	    {
	      error (0, 0, _("invalid header numbering style: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 'b':
	  if (! build_type_arg (&body_type, &body_regex))
	    {
	      error (0, 0, _("invalid body numbering style: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 'f':
	  if (! build_type_arg (&footer_type, &footer_regex))
	    {
	      error (0, 0, _("invalid footer numbering style: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 'v':
	  if (xstrtoimax (optarg, NULL, 10, &starting_line_number, "")
	      != LONGINT_OK)
	    {
	      error (0, 0, _("invalid starting line number: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 'i':
	  if (! (xstrtoimax (optarg, NULL, 10, &page_incr, "") == LONGINT_OK
		 && 0 < page_incr))
	    {
	      error (0, 0, _("invalid line number increment: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 'p':
	  reset_numbers = false;
	  break;
	case 'l':
	  if (! (xstrtoimax (optarg, NULL, 10, &blank_join, "") == LONGINT_OK
		 && 0 < blank_join))
	    {
	      error (0, 0, _("invalid number of blank lines: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 's':
	  separator_str = optarg;
	  break;
	case 'w':
	  {
	    long int tmp_long;
	    if (xstrtol (optarg, NULL, 10, &tmp_long, "") != LONGINT_OK
		|| tmp_long <= 0 || tmp_long > INT_MAX)
	      {
		error (0, 0, _("invalid line number field width: %s"),
		       quote (optarg));
		ok = false;
	      }
	    else
	      {
		lineno_width = tmp_long;
	      }
	  }
	  break;
	case 'n':
	  if (STREQ (optarg, "ln"))
	    lineno_format = FORMAT_LEFT;
	  else if (STREQ (optarg, "rn"))
	    lineno_format = FORMAT_RIGHT_NOLZ;
	  else if (STREQ (optarg, "rz"))
	    lineno_format = FORMAT_RIGHT_LZ;
	  else
	    {
	      error (0, 0, _("invalid line numbering format: %s"),
		     quote (optarg));
	      ok = false;
	    }
	  break;
	case 'd':
	  section_del = optarg;
	  break;
	case_GETOPT_HELP_CHAR;
	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
	default:
	  ok = false;
	  break;
	}
    }

  if (!ok)
    usage (EXIT_FAILURE);

  /* Initialize the section delimiters.  */
  len = strlen (section_del);

  header_del_len = len * 3;
  header_del = xmalloc (header_del_len + 1);
  strcat (strcat (strcpy (header_del, section_del), section_del), section_del);

  body_del_len = len * 2;
  body_del = xmalloc (body_del_len + 1);
  strcat (strcpy (body_del, section_del), section_del);

  footer_del_len = len;
  footer_del = xmalloc (footer_del_len + 1);
  strcpy (footer_del, section_del);

  /* Initialize the input buffer.  */
  initbuffer (&line_buf);

  /* Initialize the printf format for unnumbered lines. */
  len = strlen (separator_str);
  print_no_line_fmt = xmalloc (lineno_width + len + 1);
  memset (print_no_line_fmt, ' ', lineno_width + len);
  print_no_line_fmt[lineno_width + len] = '\0';

  line_no = starting_line_number;
  current_type = body_type;
  current_regex = &body_regex;

  /* Main processing. */

  if (optind == argc)
    ok = nl_file ("-");
  else
    for (; optind < argc; optind++)
      ok &= nl_file (argv[optind]);

  if (have_read_stdin && fclose (stdin) == EOF)
    error (EXIT_FAILURE, errno, "-");

  exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
}