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diff --git a/src/nl.c b/src/nl.c
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+/* nl -- number lines of files
+ Copyright (C) 1989-2022 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
+
+/* 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 "die.h"
+#include "error.h"
+#include "fadvise.h"
+#include "linebuffer.h"
+#include "quote.h"
+#include "xdectoint.h"
+
+/* The official name of this program (e.g., no 'g' prefix). */
+#define PROGRAM_NAME "nl"
+
+#define AUTHORS \
+ proper_name ("Scott Bartram"), \
+ proper_name ("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 DEFAULT_SECTION_DELIMITERS[] = "\\:";
+
+/* Types of input lines: either one of the section delimiters,
+ or text to output. */
+enum section
+{
+ Header, Body, Footer, Text
+};
+
+/* Format of body lines (-b). */
+static char const *body_type = "t";
+
+/* Format of header lines (-h). */
+static char const *header_type = "n";
+
+/* Format of footer lines (-f). */
+static char const *footer_type = "n";
+
+/* Format currently being used (body, header, or footer). */
+static char const *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;
+
+/* Fastmaps for the above. */
+static char body_fastmap[UCHAR_MAX + 1];
+static char header_fastmap[UCHAR_MAX + 1];
+static char footer_fastmap[UCHAR_MAX + 1];
+
+/* Pointer to current regex, if any. */
+static struct re_pattern_buffer *current_regex = NULL;
+
+/* Separator string to print after line number (-s). */
+static char const *separator_str = "\t";
+
+/* Input section delimiter string (-d). */
+static char *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;
+
+/* Whether the current line number has incremented past limits. */
+static bool line_no_overflow;
+
+/* 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'},
+ {"line-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)
+ emit_try_help ();
+ else
+ {
+ printf (_("\
+Usage: %s [OPTION]... [FILE]...\n\
+"),
+ program_name);
+ fputs (_("\
+Write each FILE to standard output, with line numbers added.\n\
+"), stdout);
+
+ emit_stdin_note ();
+ emit_mandatory_arg_note ();
+
+ fputs (_("\
+ -b, --body-numbering=STYLE use STYLE for numbering body lines\n\
+ -d, --section-delimiter=CC use CC for logical page delimiters\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, --line-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 for each section\n\
+ -s, --number-separator=STRING add STRING after (possible) line number\n\
+"), stdout);
+ fputs (_("\
+ -v, --starting-line-number=NUMBER first line number for each section\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\
+Default options are: -bt -d'\\:' -fn -hn -i1 -l1 -n'rn' -s<TAB> -v1 -w6\n\
+\n\
+CC are two delimiter characters used to construct logical page delimiters;\n\
+a missing second character implies ':'. As a GNU extension one can specify\n\
+more than two characters, and also specifying the empty string (-d '')\n\
+disables section matching.\n\
+"), stdout);
+ fputs (_("\
+\n\
+STYLE is one of:\n\
+\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\
+"), stdout);
+ fputs (_("\
+\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);
+ emit_ancillary_info (PROGRAM_NAME);
+ }
+ exit (status);
+}
+
+/* Set the command line flag TYPEP and possibly the regex pointer REGEXP,
+ according to 'optarg'. */
+
+static bool
+build_type_arg (char const **typep,
+ struct re_pattern_buffer *regexp, char *fastmap)
+{
+ char const *errmsg;
+ bool rval = true;
+
+ switch (*optarg)
+ {
+ case 'a':
+ case 't':
+ case 'n':
+ *typep = optarg;
+ break;
+ case 'p':
+ *typep = optarg++;
+ regexp->buffer = NULL;
+ regexp->allocated = 0;
+ regexp->fastmap = fastmap;
+ regexp->translate = NULL;
+ re_syntax_options =
+ RE_SYNTAX_POSIX_BASIC & ~RE_CONTEXT_INVALID_DUP & ~RE_NO_EMPTY_RANGES;
+ errmsg = re_compile_pattern (optarg, strlen (optarg), regexp);
+ if (errmsg)
+ die (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)
+{
+ if (line_no_overflow)
+ die (EXIT_FAILURE, 0, _("line number overflow"));
+
+ printf (lineno_format, lineno_width, line_no, separator_str);
+
+ if (INT_ADD_WRAPV (line_no, page_incr, &line_no))
+ line_no_overflow = true;
+}
+
+static void
+reset_lineno (void)
+{
+ if (reset_numbers)
+ {
+ line_no = starting_line_number;
+ line_no_overflow = false;
+ }
+}
+
+/* Switch to a header section. */
+
+static void
+proc_header (void)
+{
+ current_type = header_type;
+ current_regex = &header_regex;
+ reset_lineno ();
+ putchar ('\n');
+}
+
+/* Switch to a body section. */
+
+static void
+proc_body (void)
+{
+ current_type = body_type;
+ current_regex = &body_regex;
+ reset_lineno ();
+ putchar ('\n');
+}
+
+/* Switch to a footer section. */
+
+static void
+proc_footer (void)
+{
+ current_type = footer_type;
+ current_regex = &footer_regex;
+ reset_lineno ();
+ 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, NULL))
+ {
+ case -2:
+ die (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 || footer_del_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 (char const *file)
+{
+ FILE *stream;
+
+ if (STREQ (file, "-"))
+ {
+ have_read_stdin = true;
+ stream = stdin;
+ }
+ else
+ {
+ stream = fopen (file, "r");
+ if (stream == NULL)
+ {
+ error (0, errno, "%s", quotef (file));
+ return false;
+ }
+ }
+
+ fadvise (stream, FADVISE_SEQUENTIAL);
+
+ process_file (stream);
+
+ int err = errno;
+ if (!ferror (stream))
+ err = 0;
+ if (STREQ (file, "-"))
+ clearerr (stream); /* Also clear EOF. */
+ else if (fclose (stream) != 0 && !err)
+ err = errno;
+ if (err)
+ {
+ error (0, err, "%s", quotef (file));
+ return false;
+ }
+ return true;
+}
+
+int
+main (int argc, char **argv)
+{
+ int c;
+ size_t len;
+ bool ok = true;
+
+ initialize_main (&argc, &argv);
+ set_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, header_fastmap))
+ {
+ error (0, 0, _("invalid header numbering style: %s"),
+ quote (optarg));
+ ok = false;
+ }
+ break;
+ case 'b':
+ if (! build_type_arg (&body_type, &body_regex, body_fastmap))
+ {
+ error (0, 0, _("invalid body numbering style: %s"),
+ quote (optarg));
+ ok = false;
+ }
+ break;
+ case 'f':
+ if (! build_type_arg (&footer_type, &footer_regex, footer_fastmap))
+ {
+ error (0, 0, _("invalid footer numbering style: %s"),
+ quote (optarg));
+ ok = false;
+ }
+ break;
+ case 'v':
+ starting_line_number = xdectoimax (optarg, INTMAX_MIN, INTMAX_MAX, "",
+ _("invalid starting line number"),
+ 0);
+ break;
+ case 'i':
+ page_incr = xdectoimax (optarg, INTMAX_MIN, INTMAX_MAX, "",
+ _("invalid line number increment"), 0);
+ break;
+ case 'p':
+ reset_numbers = false;
+ break;
+ case 'l':
+ blank_join = xdectoimax (optarg, 1, INTMAX_MAX, "",
+ _("invalid line number of blank lines"), 0);
+ break;
+ case 's':
+ separator_str = optarg;
+ break;
+ case 'w':
+ lineno_width = xdectoimax (optarg, 1, INT_MAX, "",
+ _("invalid line number field width"), 0);
+ 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':
+ len = strlen (optarg);
+ if (len == 1 || len == 2) /* POSIX. */
+ {
+ char *p = section_del;
+ while (*optarg)
+ *p++ = *optarg++;
+ }
+ else
+ section_del = optarg; /* GNU extension. */
+ 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);
+ stpcpy (stpcpy (stpcpy (header_del, section_del), section_del), section_del);
+
+ body_del_len = len * 2;
+ body_del = header_del + len;
+
+ footer_del_len = len;
+ footer_del = body_del + len;
+
+ /* 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)
+ die (EXIT_FAILURE, errno, "-");
+
+ return ok ? EXIT_SUCCESS : EXIT_FAILURE;
+}
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