102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) 2017 Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config NL
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//config: bool "nl"
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//config: default y
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//config: help
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//config: nl is used to number lines of files.
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//applet:IF_NL(APPLET(nl, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_NL) += nl.o
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//usage:#define nl_trivial_usage
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//usage: "[OPTIONS] [FILE]..."
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//usage:#define nl_full_usage "\n\n"
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//usage: "Write FILEs to standard output with line numbers added\n"
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//usage: "\n -b STYLE Which lines to number - a: all, t: nonempty, n: none"
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//^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^TODO: support "pBRE": number only lines thatmatch regexp BRE"
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////usage: "\n -f STYLE footer lines"
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////usage: "\n -h STYLE header lines"
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////usage: "\n -d CC use CC for separating logical pages"
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//usage: "\n -i N Line number increment"
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////usage: "\n -l NUMBER group of NUMBER empty lines counted as one"
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////usage: "\n -n FORMAT lneft justified, no leading zeros; rn or rz"
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////usage: "\n -p do not reset line numbers at logical pages (huh?)"
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//usage: "\n -s STRING Use STRING as line number separator"
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//usage: "\n -v N Start from N"
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//usage: "\n -w N Width of line numbers"
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/* By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn */
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#include "libbb.h"
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void FAST_FUNC print_numbered_lines(struct number_state *ns, const char *filename)
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{
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FILE *fp = fopen_or_warn_stdin(filename);
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unsigned N = ns->start;
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char *line;
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while ((line = xmalloc_fgetline(fp)) != NULL) {
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if (ns->all
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|| (ns->nonempty && line[0])
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) {
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printf("%*u%s%s\n", ns->width, N, ns->sep, line);
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N += ns->inc;
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} else if (ns->empty_str)
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fputs(ns->empty_str, stdout);
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free(line);
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}
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fclose(fp);
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}
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int nl_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nl_main(int argc UNUSED_PARAM, char **argv)
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{
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struct number_state ns;
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const char *opt_b = "t";
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enum {
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OPT_p = (1 << 0),
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};
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#if ENABLE_LONG_OPTS
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static const char nl_longopts[] ALIGN1 =
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"body-numbering\0" Required_argument "b"
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// "footer-numbering\0" Required_argument "f" - not implemented yet
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// "header-numbering\0" Required_argument "h" - not implemented yet
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// "section-delimiter\0" Required_argument "d" - not implemented yet
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"line-increment\0" Required_argument "i"
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// "join-blank-lines\0" Required_argument "l" - not implemented yet
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// "number-format\0" Required_argument "n" - not implemented yet
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"no-renumber\0" No_argument "p" // no-op so far
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"number-separator\0" Required_argument "s"
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"starting-line-number\0"Required_argument "v"
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"number-width\0" Required_argument "w"
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;
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applet_long_options = nl_longopts;
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#endif
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ns.width = 6;
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ns.start = 1;
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ns.inc = 1;
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ns.sep = "\t";
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getopt32(argv, "pw:+s:v:+i:+b:", &ns.width, &ns.sep, &ns.start, &ns.inc, &opt_b);
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ns.all = (opt_b[0] == 'a');
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ns.nonempty = (opt_b[0] == 't');
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ns.empty_str = xasprintf("%*s\n", ns.width + (int)strlen(ns.sep), "");
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argv += optind;
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if (!*argv)
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*--argv = (char*)"-";
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do {
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print_numbered_lines(&ns, *argv);
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} while (*++argv);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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