1 /* vi: set sw=4 ts=4: */
3 * Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
5 * Licensed under GPLv2, see file LICENSE in this source tree.
11 //config: nl is used to number lines of files.
13 //applet:IF_NL(APPLET(nl, BB_DIR_USR_BIN, BB_SUID_DROP))
15 //kbuild:lib-$(CONFIG_NL) += nl.o
17 //usage:#define nl_trivial_usage
18 //usage: "[OPTIONS] [FILE]..."
19 //usage:#define nl_full_usage "\n\n"
20 //usage: "Write FILEs to standard output with line numbers added\n"
21 //usage: "\n -b STYLE Which lines to number - a: all, t: nonempty, n: none"
22 //^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^TODO: support "pBRE": number only lines thatmatch regexp BRE"
23 ////usage: "\n -f STYLE footer lines"
24 ////usage: "\n -h STYLE header lines"
25 ////usage: "\n -d CC use CC for separating logical pages"
26 //usage: "\n -i N Line number increment"
27 ////usage: "\n -l NUMBER group of NUMBER empty lines counted as one"
28 ////usage: "\n -n FORMAT lneft justified, no leading zeros; rn or rz"
29 ////usage: "\n -p do not reset line numbers at logical pages (huh?)"
30 //usage: "\n -s STRING Use STRING as line number separator"
31 //usage: "\n -v N Start from N"
32 //usage: "\n -w N Width of line numbers"
34 /* By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn */
38 void FAST_FUNC print_numbered_lines(struct number_state *ns, const char *filename)
40 FILE *fp = fopen_or_warn_stdin(filename);
41 unsigned N = ns->start;
44 while ((line = xmalloc_fgetline(fp)) != NULL) {
46 || (ns->nonempty && line[0])
48 printf("%*u%s%s\n", ns->width, N, ns->sep, line);
50 } else if (ns->empty_str)
51 fputs(ns->empty_str, stdout);
58 int nl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
59 int nl_main(int argc UNUSED_PARAM, char **argv)
61 struct number_state ns;
62 const char *opt_b = "t";
67 static const char nl_longopts[] ALIGN1 =
68 "body-numbering\0" Required_argument "b"
69 // "footer-numbering\0" Required_argument "f" - not implemented yet
70 // "header-numbering\0" Required_argument "h" - not implemented yet
71 // "section-delimiter\0" Required_argument "d" - not implemented yet
72 "line-increment\0" Required_argument "i"
73 // "join-blank-lines\0" Required_argument "l" - not implemented yet
74 // "number-format\0" Required_argument "n" - not implemented yet
75 "no-renumber\0" No_argument "p" // no-op so far
76 "number-separator\0" Required_argument "s"
77 "starting-line-number\0"Required_argument "v"
78 "number-width\0" Required_argument "w"
81 applet_long_options = nl_longopts;
87 getopt32(argv, "pw:+s:v:+i:+b:", &ns.width, &ns.sep, &ns.start, &ns.inc, &opt_b);
88 ns.all = (opt_b[0] == 'a');
89 ns.nonempty = (opt_b[0] == 't');
90 ns.empty_str = xasprintf("%*s\n", ns.width + (int)strlen(ns.sep), "");
97 print_numbered_lines(&ns, *argv);
100 fflush_stdout_and_exit(EXIT_SUCCESS);