1 /* GNU fmt -- simple text formatter.
2 Copyright (C) 1994-2022 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 /* Written by Ross Paterson <rap@doc.ic.ac.uk>. */
21 #include <sys/types.h>
25 /* Redefine. Otherwise, systems (Unicos for one) with headers that define
26 it to be a type get syntax errors for the variable declaration below. */
27 #define word unused_word_type
34 #include "xdectoint.h"
36 /* The official name of this program (e.g., no 'g' prefix). */
37 #define PROGRAM_NAME "fmt"
39 #define AUTHORS proper_name ("Ross Paterson")
41 /* The following parameters represent the program's idea of what is
42 "best". Adjust to taste, subject to the caveats given. */
44 /* Default longest permitted line length (max_width). */
47 /* Prefer lines to be LEEWAY % shorter than the maximum width, giving
48 room for optimization. */
51 /* The default secondary indent of tagged paragraph used for unindented
52 one-line paragraphs not preceded by any multi-line paragraphs. */
55 /* Costs and bonuses are expressed as the equivalent departure from the
56 optimal line length, multiplied by 10. e.g. assigning something a
57 cost of 50 means that it is as bad as a line 5 characters too short
58 or too long. The definition of SHORT_COST(n) should not be changed.
59 However, EQUIV(n) may need tuning. */
61 /* FIXME: "fmt" misbehaves given large inputs or options. One
62 possible workaround for part of the problem is to change COST to be
63 a floating-point type. There are other problems besides COST,
64 though; see MAXWORDS below. */
66 typedef long int COST
;
68 #define MAXCOST TYPE_MAXIMUM (COST)
70 #define SQR(n) ((n) * (n))
71 #define EQUIV(n) SQR ((COST) (n))
73 /* Cost of a filled line n chars longer or shorter than goal_width. */
74 #define SHORT_COST(n) EQUIV ((n) * 10)
76 /* Cost of the difference between adjacent filled lines. */
77 #define RAGGED_COST(n) (SHORT_COST (n) / 2)
79 /* Basic cost per line. */
80 #define LINE_COST EQUIV (70)
82 /* Cost of breaking a line after the first word of a sentence, where
83 the length of the word is N. */
84 #define WIDOW_COST(n) (EQUIV (200) / ((n) + 2))
86 /* Cost of breaking a line before the last word of a sentence, where
87 the length of the word is N. */
88 #define ORPHAN_COST(n) (EQUIV (150) / ((n) + 2))
90 /* Bonus for breaking a line at the end of a sentence. */
91 #define SENTENCE_BONUS EQUIV (50)
93 /* Cost of breaking a line after a period not marking end of a sentence.
94 With the definition of sentence we are using (borrowed from emacs, see
95 get_line()) such a break would then look like a sentence break. Hence
96 we assign a very high cost -- it should be avoided unless things are
98 #define NOBREAK_COST EQUIV (600)
100 /* Bonus for breaking a line before open parenthesis. */
101 #define PAREN_BONUS EQUIV (40)
103 /* Bonus for breaking a line after other punctuation. */
104 #define PUNCT_BONUS EQUIV(40)
106 /* Credit for breaking a long paragraph one line later. */
107 #define LINE_CREDIT EQUIV(3)
109 /* Size of paragraph buffer, in words and characters. Longer paragraphs
110 are handled neatly (cf. flush_paragraph()), so long as these values
111 are considerably greater than required by the width. These values
112 cannot be extended indefinitely: doing so would run into size limits
113 and/or cause more overflows in cost calculations. FIXME: Remove these
116 #define MAXWORDS 1000
117 #define MAXCHARS 5000
119 /* Extra ctype(3)-style macros. */
121 #define isopen(c) (strchr ("(['`\"", c) != NULL)
122 #define isclose(c) (strchr (")]'\"", c) != NULL)
123 #define isperiod(c) (strchr (".?!", c) != NULL)
125 /* Size of a tab stop, for expansion on input and re-introduction on
129 /* Word descriptor structure. */
131 typedef struct Word WORD
;
136 /* Static attributes determined during input. */
138 char const *text
; /* the text of the word */
139 int length
; /* length of this word */
140 int space
; /* the size of the following space */
141 unsigned int paren
:1; /* starts with open paren */
142 unsigned int period
:1; /* ends in [.?!])* */
143 unsigned int punct
:1; /* ends in punctuation */
144 unsigned int final
:1; /* end of sentence */
146 /* The remaining fields are computed during the optimization. */
148 int line_length
; /* length of the best line starting here */
149 COST best_cost
; /* cost of best paragraph starting here */
150 WORD
*next_break
; /* break which achieves best_cost */
153 /* Forward declarations. */
155 static void set_prefix (char *p
);
156 static bool fmt (FILE *f
, char const *);
157 static bool get_paragraph (FILE *f
);
158 static int get_line (FILE *f
, int c
);
159 static int get_prefix (FILE *f
);
160 static int get_space (FILE *f
, int c
);
161 static int copy_rest (FILE *f
, int c
);
162 static bool same_para (int c
);
163 static void flush_paragraph (void);
164 static void fmt_paragraph (void);
165 static void check_punctuation (WORD
*w
);
166 static COST
base_cost (WORD
*this);
167 static COST
line_cost (WORD
*next
, int len
);
168 static void put_paragraph (WORD
*finish
);
169 static void put_line (WORD
*w
, int indent
);
170 static void put_word (WORD
*w
);
171 static void put_space (int space
);
175 /* If true, first 2 lines may have different indent (default false). */
178 /* If true, first 2 lines _must_ have different indent (default false). */
181 /* If true, each line is a paragraph on its own (default false). */
184 /* If true, don't preserve inter-word spacing (default false). */
187 /* Prefix minus leading and trailing spaces (default ""). */
188 static char const *prefix
;
190 /* User-supplied maximum line width (default WIDTH). The only output
191 lines longer than this will each comprise a single word. */
192 static int max_width
;
194 /* Values derived from the option values. */
196 /* The length of prefix minus leading space. */
197 static int prefix_full_length
;
199 /* The length of the leading space trimmed from the prefix. */
200 static int prefix_lead_space
;
202 /* The length of prefix minus leading and trailing space. */
203 static int prefix_length
;
205 /* The preferred width of text lines, set to LEEWAY % less than max_width. */
206 static int goal_width
;
208 /* Dynamic variables. */
210 /* Start column of the character most recently read from the input file. */
211 static int in_column
;
213 /* Start column of the next character to be written to stdout. */
214 static int out_column
;
216 /* Space for the paragraph text -- longer paragraphs are handled neatly
217 (cf. flush_paragraph()). */
218 static char parabuf
[MAXCHARS
];
220 /* A pointer into parabuf, indicating the first unused character position. */
223 /* The words of a paragraph -- longer paragraphs are handled neatly
224 (cf. flush_paragraph()). */
225 static WORD word
[MAXWORDS
];
227 /* A pointer into the above word array, indicating the first position
228 after the last complete word. Sometimes it will point at an incomplete
230 static WORD
*word_limit
;
232 /* If true, current input file contains tab characters, and so tabs can be
233 used for white space on output. */
236 /* Space before trimmed prefix on each line of the current paragraph. */
237 static int prefix_indent
;
239 /* Indentation of the first line of the current paragraph. */
240 static int first_indent
;
242 /* Indentation of other lines of the current paragraph */
243 static int other_indent
;
245 /* To detect the end of a paragraph, we need to look ahead to the first
246 non-blank character after the prefix on the next line, or the first
247 character on the following line that failed to match the prefix.
248 We can reconstruct the lookahead from that character (next_char), its
249 position on the line (in_column) and the amount of space before the
250 prefix (next_prefix_indent). See get_paragraph() and copy_rest(). */
252 /* The last character read from the input file. */
253 static int next_char
;
255 /* The space before the trimmed prefix (or part of it) on the next line
256 after the current paragraph. */
257 static int next_prefix_indent
;
259 /* If nonzero, the length of the last line output in the current
260 paragraph, used to charge for raggedness at the split point for long
261 paragraphs chosen by fmt_paragraph(). */
262 static int last_line_length
;
267 if (status
!= EXIT_SUCCESS
)
271 printf (_("Usage: %s [-WIDTH] [OPTION]... [FILE]...\n"), program_name
);
273 Reformat each paragraph in the FILE(s), writing to standard output.\n\
274 The option -WIDTH is an abbreviated form of --width=DIGITS.\n\
278 emit_mandatory_arg_note ();
281 -c, --crown-margin preserve indentation of first two lines\n\
282 -p, --prefix=STRING reformat only lines beginning with STRING,\n\
283 reattaching the prefix to reformatted lines\n\
284 -s, --split-only split long lines, but do not refill\n\
287 /* Tell xgettext that the "% o" below is not a printf-style
288 format string: xgettext:no-c-format */
290 -t, --tagged-paragraph indentation of first line different from second\n\
291 -u, --uniform-spacing one space between words, two after sentences\n\
292 -w, --width=WIDTH maximum line width (default of 75 columns)\n\
293 -g, --goal=WIDTH goal width (default of 93% of width)\n\
295 fputs (HELP_OPTION_DESCRIPTION
, stdout
);
296 fputs (VERSION_OPTION_DESCRIPTION
, stdout
);
297 emit_ancillary_info (PROGRAM_NAME
);
302 /* Decode options and launch execution. */
304 static struct option
const long_options
[] =
306 {"crown-margin", no_argument
, NULL
, 'c'},
307 {"prefix", required_argument
, NULL
, 'p'},
308 {"split-only", no_argument
, NULL
, 's'},
309 {"tagged-paragraph", no_argument
, NULL
, 't'},
310 {"uniform-spacing", no_argument
, NULL
, 'u'},
311 {"width", required_argument
, NULL
, 'w'},
312 {"goal", required_argument
, NULL
, 'g'},
313 {GETOPT_HELP_OPTION_DECL
},
314 {GETOPT_VERSION_OPTION_DECL
},
319 main (int argc
, char **argv
)
323 char const *max_width_option
= NULL
;
324 char const *goal_width_option
= NULL
;
326 initialize_main (&argc
, &argv
);
327 set_program_name (argv
[0]);
328 setlocale (LC_ALL
, "");
329 bindtextdomain (PACKAGE
, LOCALEDIR
);
330 textdomain (PACKAGE
);
332 atexit (close_stdout
);
334 crown
= tagged
= split
= uniform
= false;
337 prefix_length
= prefix_lead_space
= prefix_full_length
= 0;
339 if (argc
> 1 && argv
[1][0] == '-' && ISDIGIT (argv
[1][1]))
341 /* Old option syntax; a dash followed by one or more digits. */
342 max_width_option
= argv
[1] + 1;
344 /* Make the option we just parsed invisible to getopt. */
350 while ((optchar
= getopt_long (argc
, argv
, "0123456789cstuw:p:g:",
356 if (ISDIGIT (optchar
))
357 error (0, 0, _("invalid option -- %c; -WIDTH is recognized\
358 only when it is the first\noption; use -w N instead"),
360 usage (EXIT_FAILURE
);
379 max_width_option
= optarg
;
383 goal_width_option
= optarg
;
390 case_GETOPT_HELP_CHAR
;
392 case_GETOPT_VERSION_CHAR (PROGRAM_NAME
, AUTHORS
);
396 if (max_width_option
)
398 /* Limit max_width to MAXCHARS / 2; otherwise, the resulting
399 output can be quite ugly. */
400 max_width
= xdectoumax (max_width_option
, 0, MAXCHARS
/ 2, "",
401 _("invalid width"), 0);
404 if (goal_width_option
)
406 /* Limit goal_width to max_width. */
407 goal_width
= xdectoumax (goal_width_option
, 0, max_width
, "",
408 _("invalid width"), 0);
409 if (max_width_option
== NULL
)
410 max_width
= goal_width
+ 10;
414 goal_width
= max_width
* (2 * (100 - LEEWAY
) + 1) / 200;
417 bool have_read_stdin
= false;
421 have_read_stdin
= true;
422 ok
= fmt (stdin
, "-");
426 for (; optind
< argc
; optind
++)
428 char *file
= argv
[optind
];
429 if (STREQ (file
, "-"))
431 ok
&= fmt (stdin
, file
);
432 have_read_stdin
= true;
437 in_stream
= fopen (file
, "r");
438 if (in_stream
!= NULL
)
439 ok
&= fmt (in_stream
, file
);
442 error (0, errno
, _("cannot open %s for reading"),
450 if (have_read_stdin
&& fclose (stdin
) != 0)
451 die (EXIT_FAILURE
, errno
, "%s", _("closing standard input"));
453 return ok
? EXIT_SUCCESS
: EXIT_FAILURE
;
456 /* Trim space from the front and back of the string P, yielding the prefix,
457 and record the lengths of the prefix and the space trimmed. */
464 prefix_lead_space
= 0;
471 prefix_full_length
= strlen (p
);
472 s
= p
+ prefix_full_length
;
473 while (s
> p
&& s
[-1] == ' ')
476 prefix_length
= s
- p
;
479 /* Read F and send formatted output to stdout.
480 Close F when done, unless F is stdin. Diagnose input errors, using FILE.
481 If !F, assume F resulted from an fopen failure and diagnose that.
482 Return true if successful. */
485 fmt (FILE *f
, char const *file
)
487 fadvise (f
, FADVISE_SEQUENTIAL
);
490 next_char
= get_prefix (f
);
491 while (get_paragraph (f
))
494 put_paragraph (word_limit
);
497 int err
= ferror (f
) ? 0 : -1;
500 else if (fclose (f
) != 0 && err
< 0)
503 error (0, err
, err
? "%s" : _("read error"), quotef (file
));
507 /* Set the global variable 'other_indent' according to SAME_PARAGRAPH
508 and other global variables. */
511 set_other_indent (bool same_paragraph
)
514 other_indent
= first_indent
;
517 other_indent
= (same_paragraph
? in_column
: first_indent
);
521 if (same_paragraph
&& in_column
!= first_indent
)
523 other_indent
= in_column
;
526 /* Only one line: use the secondary indent from last time if it
527 splits, or 0 if there have been no multi-line paragraphs in the
528 input so far. But if these rules make the two indents the same,
529 pick a new secondary indent. */
531 else if (other_indent
== first_indent
)
532 other_indent
= first_indent
== 0 ? DEF_INDENT
: 0;
536 other_indent
= first_indent
;
540 /* Read a paragraph from input file F. A paragraph consists of a
541 maximal number of non-blank (excluding any prefix) lines subject to:
542 * In split mode, a paragraph is a single non-blank line.
543 * In crown mode, the second and subsequent lines must have the
544 same indentation, but possibly different from the indent of the
546 * Tagged mode is similar, but the first and second lines must have
547 different indentations.
548 * Otherwise, all lines of a paragraph must have the same indent.
549 If a prefix is in effect, it must be present at the same indent for
550 each line in the paragraph.
552 Return false if end-of-file was encountered before the start of a
553 paragraph, else true. */
556 get_paragraph (FILE *f
)
560 last_line_length
= 0;
563 /* Scan (and copy) blank lines, and lines not introduced by the prefix. */
565 while (c
== '\n' || c
== EOF
566 || next_prefix_indent
< prefix_lead_space
567 || in_column
< next_prefix_indent
+ prefix_full_length
)
569 c
= copy_rest (f
, c
);
579 /* Got a suitable first line for a paragraph. */
581 prefix_indent
= next_prefix_indent
;
582 first_indent
= in_column
;
586 set_other_indent (same_para (c
));
588 /* Read rest of paragraph (unless split is specified). */
599 { /* for each line till the end of the para */
602 while (same_para (c
) && in_column
== other_indent
);
607 if (same_para (c
) && in_column
!= first_indent
)
610 { /* for each line till the end of the para */
613 while (same_para (c
) && in_column
== other_indent
);
618 while (same_para (c
) && in_column
== other_indent
)
622 /* Tell static analysis tools that using word_limit[-1] is ok.
623 word_limit is guaranteed to have been incremented by get_line. */
624 assert (word
< word_limit
);
626 (word_limit
- 1)->period
= (word_limit
- 1)->final
= true;
631 /* Copy to the output a line that failed to match the prefix, or that
632 was blank after the prefix. In the former case, C is the character
633 that failed to match the prefix. In the latter, C is \n or EOF.
634 Return the character (\n or EOF) ending the line. */
637 copy_rest (FILE *f
, int c
)
642 if (in_column
> next_prefix_indent
|| (c
!= '\n' && c
!= EOF
))
644 put_space (next_prefix_indent
);
645 for (s
= prefix
; out_column
!= in_column
&& *s
; out_column
++)
647 if (c
!= EOF
&& c
!= '\n')
648 put_space (in_column
- out_column
);
649 if (c
== EOF
&& in_column
>= next_prefix_indent
+ prefix_length
)
652 while (c
!= '\n' && c
!= EOF
)
660 /* Return true if a line whose first non-blank character after the
661 prefix (if any) is C could belong to the current paragraph,
667 return (next_prefix_indent
== prefix_indent
668 && in_column
>= next_prefix_indent
+ prefix_full_length
669 && c
!= '\n' && c
!= EOF
);
672 /* Read a line from input file F, given first non-blank character C
673 after the prefix, and the following indent, and break it into words.
674 A word is a maximal non-empty string of non-white characters. A word
675 ending in [.?!][])"']* and followed by end-of-line or at least two
676 spaces ends a sentence, as in emacs.
678 Return the first non-blank character of the next line. */
681 get_line (FILE *f
, int c
)
684 char *end_of_parabuf
;
687 end_of_parabuf
= ¶buf
[MAXCHARS
];
688 end_of_word
= &word
[MAXWORDS
- 2];
691 { /* for each word in a line */
695 word_limit
->text
= wptr
;
698 if (wptr
== end_of_parabuf
)
700 set_other_indent (true);
706 while (c
!= EOF
&& !c_isspace (c
));
707 in_column
+= word_limit
->length
= wptr
- word_limit
->text
;
708 check_punctuation (word_limit
);
710 /* Scan inter-word space. */
713 c
= get_space (f
, c
);
714 word_limit
->space
= in_column
- start
;
715 word_limit
->final
= (c
== EOF
716 || (word_limit
->period
717 && (c
== '\n' || word_limit
->space
> 1)));
718 if (c
== '\n' || c
== EOF
|| uniform
)
719 word_limit
->space
= word_limit
->final
? 2 : 1;
720 if (word_limit
== end_of_word
)
722 set_other_indent (true);
727 while (c
!= '\n' && c
!= EOF
);
728 return get_prefix (f
);
731 /* Read a prefix from input file F. Return either first non-matching
732 character, or first non-blank character after the prefix. */
740 c
= get_space (f
, getc (f
));
741 if (prefix_length
== 0)
742 next_prefix_indent
= prefix_lead_space
< in_column
?
743 prefix_lead_space
: in_column
;
747 next_prefix_indent
= in_column
;
748 for (p
= prefix
; *p
!= '\0'; p
++)
750 unsigned char pc
= *p
;
756 c
= get_space (f
, c
);
761 /* Read blank characters from input file F, starting with C, and keeping
762 in_column up-to-date. Return first non-blank character. */
765 get_space (FILE *f
, int c
)
774 in_column
= (in_column
/ TABWIDTH
+ 1) * TABWIDTH
;
782 /* Set extra fields in word W describing any attached punctuation. */
785 check_punctuation (WORD
*w
)
787 char const *start
= w
->text
;
788 char const *finish
= start
+ (w
->length
- 1);
789 unsigned char fin
= *finish
;
791 w
->paren
= isopen (*start
);
792 w
->punct
= !! ispunct (fin
);
793 while (start
< finish
&& isclose (*finish
))
795 w
->period
= isperiod (*finish
);
798 /* Flush part of the paragraph to make room. This function is called on
799 hitting the limit on the number of words or characters. */
802 flush_paragraph (void)
809 /* In the special case where it's all one word, just flush it. */
811 if (word_limit
== word
)
813 fwrite (parabuf
, sizeof *parabuf
, wptr
- parabuf
, stdout
);
819 - format what you have so far as a paragraph,
820 - find a low-cost line break near the end,
822 - make that the start of the paragraph. */
826 /* Choose a good split point. */
828 split_point
= word_limit
;
829 best_break
= MAXCOST
;
830 for (w
= word
->next_break
; w
!= word_limit
; w
= w
->next_break
)
832 if (w
->best_cost
- w
->next_break
->best_cost
< best_break
)
835 best_break
= w
->best_cost
- w
->next_break
->best_cost
;
837 if (best_break
<= MAXCOST
- LINE_CREDIT
)
838 best_break
+= LINE_CREDIT
;
840 put_paragraph (split_point
);
842 /* Copy text of words down to start of parabuf -- we use memmove because
843 the source and target may overlap. */
845 memmove (parabuf
, split_point
->text
, wptr
- split_point
->text
);
846 shift
= split_point
->text
- parabuf
;
849 /* Adjust text pointers. */
851 for (w
= split_point
; w
<= word_limit
; w
++)
854 /* Copy words from split_point down to word -- we use memmove because
855 the source and target may overlap. */
857 memmove (word
, split_point
, (word_limit
- split_point
+ 1) * sizeof *word
);
858 word_limit
-= split_point
- word
;
861 /* Compute the optimal formatting for the whole paragraph by computing
862 and remembering the optimal formatting for each suffix from the empty
863 one to the whole paragraph. */
873 word_limit
->best_cost
= 0;
874 saved_length
= word_limit
->length
;
875 word_limit
->length
= max_width
; /* sentinel */
877 for (start
= word_limit
- 1; start
>= word
; start
--)
880 len
= start
== word
? first_indent
: other_indent
;
882 /* At least one word, however long, in the line. */
890 /* Consider breaking before w. */
892 wcost
= line_cost (w
, len
) + w
->best_cost
;
893 if (start
== word
&& last_line_length
> 0)
894 wcost
+= RAGGED_COST (len
- last_line_length
);
898 start
->next_break
= w
;
899 start
->line_length
= len
;
902 /* This is a kludge to keep us from computing 'len' as the
903 sum of the sentinel length and some non-zero number.
904 Since the sentinel w->length may be INT_MAX, adding
905 to that would give a negative result. */
909 len
+= (w
- 1)->space
+ w
->length
; /* w > start >= word */
911 while (len
< max_width
);
912 start
->best_cost
= best
+ base_cost (start
);
915 word_limit
->length
= saved_length
;
918 /* Return the constant component of the cost of breaking before the
922 base_cost (WORD
*this)
930 if ((this - 1)->period
)
932 if ((this - 1)->final
)
933 cost
-= SENTENCE_BONUS
;
935 cost
+= NOBREAK_COST
;
937 else if ((this - 1)->punct
)
939 else if (this > word
+ 1 && (this - 2)->final
)
940 cost
+= WIDOW_COST ((this - 1)->length
);
945 else if (this->final
)
946 cost
+= ORPHAN_COST (this->length
);
951 /* Return the component of the cost of breaking before word NEXT that
952 depends on LEN, the length of the line beginning there. */
955 line_cost (WORD
*next
, int len
)
960 if (next
== word_limit
)
962 n
= goal_width
- len
;
963 cost
= SHORT_COST (n
);
964 if (next
->next_break
!= word_limit
)
966 n
= len
- next
->line_length
;
967 cost
+= RAGGED_COST (n
);
972 /* Output to stdout a paragraph from word up to (but not including)
973 FINISH, which must be in the next_break chain from word. */
976 put_paragraph (WORD
*finish
)
980 put_line (word
, first_indent
);
981 for (w
= word
->next_break
; w
!= finish
; w
= w
->next_break
)
982 put_line (w
, other_indent
);
985 /* Output to stdout the line beginning with word W, beginning in column
986 INDENT, including the prefix (if any). */
989 put_line (WORD
*w
, int indent
)
994 put_space (prefix_indent
);
995 fputs (prefix
, stdout
);
996 out_column
+= prefix_length
;
997 put_space (indent
- out_column
);
999 endline
= w
->next_break
- 1;
1000 for (; w
!= endline
; w
++)
1003 put_space (w
->space
);
1006 last_line_length
= out_column
;
1010 /* Output to stdout the word W. */
1019 for (n
= w
->length
; n
!= 0; n
--)
1021 out_column
+= w
->length
;
1024 /* Output to stdout SPACE spaces, or equivalent tabs. */
1027 put_space (int space
)
1029 int space_target
, tab_target
;
1031 space_target
= out_column
+ space
;
1034 tab_target
= space_target
/ TABWIDTH
* TABWIDTH
;
1035 if (out_column
+ 1 < tab_target
)
1036 while (out_column
< tab_target
)
1039 out_column
= (out_column
/ TABWIDTH
+ 1) * TABWIDTH
;
1042 while (out_column
< space_target
)