Taken from netbsd with minor modifications. Comments?
Index: Makefile
===================================================================
RCS file: /cvs/src/usr.bin/Makefile,v
retrieving revision 1.129
diff -u -p -r1.129 Makefile
--- Makefile 15 Mar 2013 06:01:41 -0000 1.129
+++ Makefile 30 Apr 2013 15:22:59 -0000
@@ -16,7 +16,7 @@ SUBDIR= apply apropos ar arch asa asn1_c
m4 mail make man mandoc mesg mg \
midiplay mixerctl mkdep mklocale mkstr mktemp modstat nc netstat \
newsyslog \
- nfsstat nice nm nohup oldrdist pagesize passwd paste patch pctr \
+ nfsstat nice nm nl nohup oldrdist pagesize passwd paste patch pctr \
pkg-config pkill \
pr printenv printf quota radioctl ranlib rcs rdist rdistd \
readlink renice rev rpcgen rpcinfo rs rsh rup ruptime rusers rwall \
Index: nl/Makefile
===================================================================
RCS file: nl/Makefile
diff -N nl/Makefile
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ nl/Makefile 30 Apr 2013 15:23:00 -0000
@@ -0,0 +1,6 @@
+# $OpenBSD$
+# $NetBSD: Makefile,v 1.4 2011/08/16 12:00:46 christos Exp $
+
+PROG= nl
+
+.include <bsd.prog.mk>
Index: nl/nl.1
===================================================================
RCS file: nl/nl.1
diff -N nl/nl.1
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ nl/nl.1 30 Apr 2013 15:23:00 -0000
@@ -0,0 +1,212 @@
+.\" $OpenBSD$
+.\" $NetBSD: nl.1,v 1.12 2012/04/08 22:00:39 wiz Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Klaus Klein.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate$
+.Dt NL 1
+.Os
+.Sh NAME
+.Nm nl
+.Nd line numbering filter
+.Sh SYNOPSIS
+.Nm
+.Op Fl p
+.Op Fl b Ar type
+.Op Fl d Ar delim
+.Op Fl f Ar type
+.Op Fl h Ar type
+.Op Fl i Ar incr
+.Op Fl l Ar num
+.Op Fl n Ar format
+.Op Fl s Ar sep
+.Op Fl v Ar startnum
+.Op Fl w Ar width
+.Op Ar file
+.Sh DESCRIPTION
+The
+.Nm
+utility reads lines from the named
+.Ar file
+or the standard input if the
+.Ar file
+argument is omitted,
+applies a configurable line numbering filter operation and writes the result
+to the standard output.
+.Pp
+The
+.Nm
+utility treats the text it reads in terms of logical pages.
+Unless specified otherwise, line numbering is reset at the start of each
+logical page.
+A logical page consists of a header, a body and a footer section; empty
+sections are valid.
+Different line numbering options are independently available for header,
+body and footer sections.
+.Pp
+The starts of logical page sections are signaled by input lines containing
+nothing but one of the following sequences of delimiter characters:
+.Bd -unfilled -offset indent
+.Bl -column "\e:\e:\e: " "header "
+.It Em "Line" "Start of"
+.It \e:\e:\e: header
+.It \e:\e: body
+.It \e: footer
+.El
+.Ed
+.Pp
+If the input does not contain any logical page section signaling directives,
+the text being read is assumed to consist of a single logical page body.
+.Pp
+The following options are available:
+.Bl -tag -width indent
+.It Fl b Ar type
+Specify the logical page body lines to be numbered.
+Recognized
+.Ar type
+arguments are:
+.Bl -tag -width pstringXX
+.It a
+Number all lines.
+.It t
+Number only non-empty lines.
+.It n
+No line numbering.
+.It p Ns Ar expr
+Number only those lines that contain the basic regular expression specified
+by
+.Ar expr .
+.El
+.Pp
+The default
+.Ar type
+for logical page body lines is t.
+.It Fl d Ar delim
+Specify the delimiter characters used to indicate the start of a logical
+page section in the input file.
+At most two characters may be specified; if only one character is specified,
+the first character is replaced and the second character remains unchanged.
+The default
+.Ar delim
+characters are ``\e:''.
+.It Fl f Ar type
+Specify the same as
+.Fl b Ar type
+except for logical page footer lines.
+The default
+.Ar type
+for logical page footer lines is n.
+.It Fl h Ar type
+Specify the same as
+.Fl b Ar type
+except for logical page header lines.
+The default
+.Ar type
+for logical page header lines is n.
+.It Fl i Ar incr
+Specify the increment value used to number logical page lines.
+The default
+.Ar incr
+value is 1.
+.It Fl l Ar num
+If numbering of all lines is specified for the current logical section
+using the corresponding
+.Fl b
+a,
+.Fl f
+a
+or
+.Fl h
+a
+option,
+specify the number of adjacent blank lines to be considered as one.
+For example,
+.Fl l
+2 results in only the second adjacent blank line being numbered.
+The default
+.Ar num
+value is 1.
+.It Fl n Ar format
+Specify the line numbering output format.
+Recognized
+.Ar format
+arguments are:
+.Bl -tag -width lnXX -compact
+.It ln
+Left justified.
+.It rn
+Right justified, leading zeros suppressed.
+.It rz
+Right justified, leading zeros kept.
+.El
+.Pp
+The default
+.Ar format
+is rn.
+.It Fl p
+Specify that line numbering should not be restarted at logical page delimiters.
+.It Fl s Ar sep
+Specify the characters used in separating the line number and the corresponding
+text line.
+The default
+.Ar sep
+setting is a single tab character.
+.It Fl v Ar startnum
+Specify the initial value used to number logical page lines; see also the
+description of the
+.Fl p
+option.
+The default
+.Ar startnum
+value is 1.
+.It Fl w Ar width
+Specify the number of characters to be occupied by the line number;
+in case the
+.Ar width
+is insufficient to hold the line number, it will be truncated to its
+.Ar width
+least significant digits.
+The default
+.Ar width
+is 6.
+.El
+.Sh EXIT STATUS
+.Ex -std
+.Sh SEE ALSO
+.Xr pr 1
+.Sh STANDARDS
+The
+.Nm
+utility is compliant with the
+.St -p1003.1-2008
+specification.
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.At V.2 .
Index: nl/nl.c
===================================================================
RCS file: nl/nl.c
diff -N nl/nl.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ nl/nl.c 30 Apr 2013 15:23:00 -0000
@@ -0,0 +1,384 @@
+/* $OpenBSD$ */
+/* $NetBSD: nl.c,v 1.11 2011/08/16 12:00:46 christos Exp $ */
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Klaus Klein.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+#include <err.h>
+#include <limits.h>
+#include <locale.h>
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+typedef enum {
+ number_all, /* number all lines */
+ number_nonempty, /* number non-empty lines */
+ number_none, /* no line numbering */
+ number_regex /* number lines matching regular expression */
+} numbering_type;
+
+struct numbering_property {
+ const char * const name; /* for diagnostics */
+ numbering_type type; /* numbering type */
+ regex_t expr; /* for type == number_regex */
+};
+
+/* line numbering formats */
+#define FORMAT_LN "%-*d" /* left justified, leading zeros suppressed */
+#define FORMAT_RN "%*d" /* right justified, leading zeros suppressed */
+#define FORMAT_RZ "%0*d" /* right justified, leading zeros kept */
+
+#define FOOTER 0
+#define BODY 1
+#define HEADER 2
+#define NP_LAST HEADER
+
+static struct numbering_property numbering_properties[NP_LAST + 1] = {
+ { "footer", number_none, { 0, 0, 0, 0 } },
+ { "body", number_nonempty, { 0, 0, 0, 0 } },
+ { "header", number_none, { 0, 0, 0, 0 } },
+};
+
+#define max(a, b) ((a) > (b) ? (a) : (b))
+
+/*
+ * Maximum number of characters required for a decimal representation of a
+ * (signed) int; courtesy of tzcode.
+ */
+#define INT_STRLEN_MAXIMUM \
+ ((sizeof (int) * CHAR_BIT - 1) * 302 / 1000 + 2)
+
+static void filter(void);
+static void parse_numbering(const char *, int);
+static __dead void usage(void);
+
+/*
+ * Pointer to dynamically allocated input line buffer, and its size.
+ */
+static char *buffer;
+static size_t buffersize;
+
+/*
+ * Dynamically allocated buffer suitable for string representation of ints.
+ */
+static char *intbuffer;
+static size_t intbuffersize;
+
+/*
+ * Configurable parameters.
+ */
+/* delimiter characters that indicate the start of a logical page section */
+static char delim[2] = { '\\', ':' };
+
+/* line numbering format */
+static const char *format = FORMAT_RN;
+
+/* increment value used to number logical page lines */
+static int incr = 1;
+
+/* number of adjacent blank lines to be considered (and numbered) as one */
+static unsigned int nblank = 1;
+
+/* whether to restart numbering at logical page delimiters */
+static int restart = 1;
+
+/* characters used in separating the line number and the corrsp. text line */
+static const char *sep = "\t";
+
+/* initial value used to number logical page lines */
+static int startnum = 1;
+
+/* number of characters to be used for the line number */
+/* should be unsigned but required signed by `*' precision conversion */
+static int width = 6;
+
+
+int
+main(int argc, char *argv[])
+{
+ int c;
+ long val;
+ const char *errstr;
+
+ (void)setlocale(LC_ALL, "");
+
+ /*
+ * Note: this implementation strictly conforms to the XBD Utility
+ * Syntax Guidelines and does not permit the optional `file' operand
+ * to be intermingled with the options, which is defined in the
+ * XCU specification (Issue 5) but declared an obsolescent feature that
+ * will be removed from a future issue. It shouldn't matter, though.
+ */
+ while ((c = getopt(argc, argv, "pb:d:f:h:i:l:n:s:v:w:")) != -1) {
+ switch (c) {
+ case 'p':
+ restart = 0;
+ break;
+ case 'b':
+ parse_numbering(optarg, BODY);
+ break;
+ case 'd':
+ if (optarg[0] != '\0')
+ delim[0] = optarg[0];
+ if (optarg[1] != '\0')
+ delim[1] = optarg[1];
+ /* at most two delimiter characters */
+ if (optarg[2] != '\0') {
+ errx(EXIT_FAILURE,
+ "invalid delim argument -- %s",
+ optarg);
+ /* NOTREACHED */
+ }
+ break;
+ case 'f':
+ parse_numbering(optarg, FOOTER);
+ break;
+ case 'h':
+ parse_numbering(optarg, HEADER);
+ break;
+ case 'i':
+ incr = strtonum(optarg, INT_MIN, INT_MAX, &errstr);
+ if (errstr)
+ errx(EXIT_FAILURE, "increment value is %s: %s",
+ errstr, optarg);
+ break;
+ case 'l':
+ nblank = strtonum(optarg, 0, UINT_MAX, &errstr);
+ if (errstr)
+ errx(EXIT_FAILURE,
+ "blank line value is %s: %s",
+ errstr, optarg);
+ break;
+ case 'n':
+ if (strcmp(optarg, "ln") == 0) {
+ format = FORMAT_LN;
+ } else if (strcmp(optarg, "rn") == 0) {
+ format = FORMAT_RN;
+ } else if (strcmp(optarg, "rz") == 0) {
+ format = FORMAT_RZ;
+ } else
+ errx(EXIT_FAILURE,
+ "illegal format -- %s", optarg);
+ break;
+ case 's':
+ sep = optarg;
+ break;
+ case 'v':
+ startnum = strtonum(optarg, INT_MIN, INT_MAX, &errstr);
+ if (errstr)
+ errx(EXIT_FAILURE,
+ "initial logical page value is %s: %s",
+ errstr, optarg);
+ break;
+ case 'w':
+ width = strtonum(optarg, 1, INT_MAX, &errstr);
+ if (errstr)
+ errx(EXIT_FAILURE, "width is %s: %s", errstr,
+ optarg);
+ break;
+ case '?':
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ }
+ argc -= optind;
+ argv += optind;
+
+ switch (argc) {
+ case 0:
+ break;
+ case 1:
+ if (freopen(argv[0], "r", stdin) == NULL)
+ err(EXIT_FAILURE, "Cannot open `%s'", argv[0]);
+ break;
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+
+ /* Determine the maximum input line length to operate on. */
+ if ((val = sysconf(_SC_LINE_MAX)) == -1) /* ignore errno */
+ val = LINE_MAX;
+ /* Allocate sufficient buffer space (including the terminating NUL). */
+ buffersize = (size_t)val + 1;
+ if ((buffer = malloc(buffersize)) == NULL)
+ err(EXIT_FAILURE, "Cannot allocate input line buffer");
+
+ /* Allocate a buffer suitable for preformatting line number. */
+ intbuffersize = max((int)INT_STRLEN_MAXIMUM, width) + 1; /* NUL */
+ if ((intbuffer = malloc(intbuffersize)) == NULL)
+ err(EXIT_FAILURE, "cannot allocate preformatting buffer");
+
+ /* Do the work. */
+ filter();
+
+ return EXIT_SUCCESS;
+ /* NOTREACHED */
+}
+
+static void
+filter(void)
+{
+ int line; /* logical line number */
+ int section; /* logical page section */
+ unsigned int adjblank; /* adjacent blank lines */
+ int consumed; /* intbuffer measurement */
+ int donumber, idx;
+
+ adjblank = 0;
+ line = startnum;
+ section = BODY;
+
+ while (fgets(buffer, (int)buffersize, stdin) != NULL) {
+ for (idx = FOOTER; idx <= NP_LAST; idx++) {
+ /* Does it look like a delimiter? */
+ if (buffer[2 * idx + 0] == delim[0] &&
+ buffer[2 * idx + 1] == delim[1]) {
+ /* Was this the whole line? */
+ if (buffer[2 * idx + 2] == '\n') {
+ section = idx;
+ adjblank = 0;
+ if (restart)
+ line = startnum;
+ goto nextline;
+ }
+ } else {
+ break;
+ }
+ }
+
+ switch (numbering_properties[section].type) {
+ case number_all:
+ /*
+ * Doing this for number_all only is disputable, but
+ * the standard expresses an explicit dependency on
+ * `-b a' etc.
+ */
+ if (buffer[0] == '\n' && ++adjblank < nblank)
+ donumber = 0;
+ else
+ donumber = 1, adjblank = 0;
+ break;
+ case number_nonempty:
+ donumber = (buffer[0] != '\n');
+ break;
+ case number_none:
+ donumber = 0;
+ break;
+ case number_regex:
+ donumber =
+ (regexec(&numbering_properties[section].expr,
+ buffer, 0, NULL, 0) == 0);
+ break;
+ }
+
+ if (donumber) {
+ consumed = snprintf(intbuffer, intbuffersize, format,
+ width, line);
+ (void)printf("%s",
+ intbuffer + max(0, consumed - width));
+ line += incr;
+ } else {
+ (void)printf("%*s", width, "");
+ }
+ (void)printf("%s%s", sep, buffer);
+
+ if (ferror(stdout))
+ err(EXIT_FAILURE, "output error");
+nextline:
+ ;
+ }
+
+ if (ferror(stdin))
+ err(EXIT_FAILURE, "input error");
+}
+
+/*
+ * Various support functions.
+ */
+
+static void
+parse_numbering(const char *argstr, int section)
+{
+ int error;
+ char errorbuf[NL_TEXTMAX];
+
+ switch (argstr[0]) {
+ case 'a':
+ numbering_properties[section].type = number_all;
+ break;
+ case 'n':
+ numbering_properties[section].type = number_none;
+ break;
+ case 't':
+ numbering_properties[section].type = number_nonempty;
+ break;
+ case 'p':
+ /* If there was a previous expression, throw it away. */
+ if (numbering_properties[section].type == number_regex)
+ regfree(&numbering_properties[section].expr);
+ else
+ numbering_properties[section].type = number_regex;
+
+ /* Compile/validate the supplied regular expression. */
+ if ((error = regcomp(&numbering_properties[section].expr,
+ &argstr[1], REG_NEWLINE|REG_NOSUB)) != 0) {
+ (void)regerror(error,
+ &numbering_properties[section].expr,
+ errorbuf, sizeof (errorbuf));
+ errx(EXIT_FAILURE,
+ "%s expr: %s -- %s",
+ numbering_properties[section].name, errorbuf,
+ &argstr[1]);
+ }
+ break;
+ default:
+ errx(EXIT_FAILURE,
+ "illegal %s line numbering type -- %s",
+ numbering_properties[section].name, argstr);
+ exit(EXIT_FAILURE);
+ }
+}
+
+static __dead void
+usage(void)
+{
+ extern char *__progname;
+
+ (void)fprintf(stderr, "usage: %s [-p] [-b type] [-d delim] [-f type] "
+ "[-h type] [-i incr] [-l num]\n\t[-n format] [-s sep] "
+ "[-v startnum] [-w width] [file]\n", __progname);
+ exit(EXIT_FAILURE);
+}
