aboutsummaryrefslogtreecommitdiff
path: root/coreutils/nl.c
diff options
context:
space:
mode:
Diffstat (limited to 'coreutils/nl.c')
-rw-r--r--coreutils/nl.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/coreutils/nl.c b/coreutils/nl.c
new file mode 100644
index 000000000..97931f334
--- /dev/null
+++ b/coreutils/nl.c
@@ -0,0 +1,100 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
4 */
5//config:config NL
6//config: bool "nl"
7//config: default y
8//config: help
9//config: nl is used to number lines of files.
10
11//applet:IF_UNIQ(APPLET(nl, BB_DIR_USR_BIN, BB_SUID_DROP))
12
13//kbuild:lib-$(CONFIG_UNIQ) += nl.o
14
15//usage:#define nl_trivial_usage
16//usage: "[OPTIONS] [FILE]..."
17//usage:#define nl_full_usage "\n\n"
18//usage: "Write FILEs to standard output with line numbers added\n"
19//usage: "\n -b STYLE Which lines to number - a: all, t: nonempty, n: none"
20//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^TODO: support "pBRE": number only lines thatmatch regexp BRE"
21////usage: "\n -f STYLE footer lines"
22////usage: "\n -h STYLE header lines"
23////usage: "\n -d CC use CC for separating logical pages"
24//usage: "\n -i N Line number increment"
25////usage: "\n -l NUMBER group of NUMBER empty lines counted as one"
26////usage: "\n -n FORMAT lneft justified, no leading zeros; rn or rz"
27////usage: "\n -p do not reset line numbers at logical pages (huh?)"
28//usage: "\n -s STRING Use STRING as line number separator"
29//usage: "\n -v N Start from N"
30//usage: "\n -w N Width of line numbers"
31
32/* By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn */
33
34#include "libbb.h"
35
36void FAST_FUNC print_numbered_lines(struct number_state *ns, const char *filename)
37{
38 FILE *fp = fopen_or_warn_stdin(filename);
39 unsigned N = ns->start;
40 char *line;
41
42 while ((line = xmalloc_fgetline(fp)) != NULL) {
43 if (ns->all
44 || (ns->nonempty && line[0])
45 ) {
46 printf("%*u%s%s\n", ns->width, N, ns->sep, line);
47 N += ns->inc;
48 } else if (ns->empty_str)
49 fputs(ns->empty_str, stdout);
50 free(line);
51 }
52
53 fclose(fp);
54}
55
56int nl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
57int nl_main(int argc UNUSED_PARAM, char **argv)
58{
59 unsigned opt;
60 struct number_state ns;
61 const char *opt_b = "t";
62 enum {
63 OPT_p = (1 << 0),
64 };
65#if ENABLE_LONG_OPTS
66 static const char nl_longopts[] ALIGN1 =
67 "body-numbering\0" Required_argument "b"
68 // "footer-numbering\0" Required_argument "f" - not implemented yet
69 // "header-numbering\0" Required_argument "h" - not implemented yet
70 // "section-delimiter\0" Required_argument "d" - not implemented yet
71 "line-increment\0" Required_argument "i"
72 // "join-blank-lines\0" Required_argument "l" - not implemented yet
73 // "number-format\0" Required_argument "n" - not implemented yet
74 "no-renumber\0" No_argument "p" // no-op so far
75 "number-separator\0" Required_argument "s"
76 "starting-line-number\0"Required_argument "v"
77 "number-width\0" Required_argument "w"
78 ;
79
80 applet_long_options = nl_longopts;
81#endif
82 ns.width = 6;
83 ns.start = 1;
84 ns.inc = 1;
85 ns.sep = "\t";
86 opt = getopt32(argv, "pw:+s:v:+i:+b:", &ns.width, &ns.sep, &ns.start, &ns.inc, &opt_b);
87 ns.all = (opt_b[0] == 'a');
88 ns.nonempty = (opt_b[0] == 't');
89 ns.empty_str = xasprintf("%*s\n", ns.width + strlen(ns.sep), "");
90
91 argv += optind;
92 if (!*argv)
93 *--argv = (char*)"-";
94
95 do {
96 print_numbered_lines(&ns, *argv);
97 } while (*++argv);
98
99 fflush_stdout_and_exit(EXIT_SUCCESS);
100}