initial population

2 files changed, 299 insertions, 0 deletions

diff --git a/usr.bin/head/head.1 b/usr.bin/head/head.1
new file mode 100644
index 0000000..a7fa0bc
--- /dev/null
+++ b/usr.bin/head/head.1
@@ -0,0 +1,95 @@
+.\"	$NetBSD: head.1,v 1.14 2017/07/04 06:59:34 wiz Exp $
+.\"
+.\" Copyright (c) 1980, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"	from: @(#)head.1	8.1 (Berkeley) 6/6/93
+.\"
+.Dd May 4, 2004
+.Dt HEAD 1
+.Os
+.Sh NAME
+.Nm head
+.Nd display first lines of a file
+.Sh SYNOPSIS
+.Nm
+.Op Fl qv
+.Op Fl n Ar count
+.Op Fl c Ar byte_count
+.Op Ar file ...
+.Sh DESCRIPTION
+This filter displays the first
+.Ar count
+lines of each of the specified files, or of the standard input if no
+files are specified.
+If
+.Ar count
+is omitted it defaults to 10.
+If
+.Fl c Ar byte_count
+is specified,
+.Nm
+counts bytes instead of lines.
+.Pp
+If more than a single file is specified, or the
+.Fl v
+option is used, each file is preceded by a header consisting of the string
+.Dq ==> XXX \*[Le]=
+where
+.Dq XXX
+is the name of the file.
+The
+.Fl q
+flag disables the printing of the header in all cases.
+.Sh EXIT STATUS
+.Ex -std head
+.Sh COMPATIBILITY
+The historic command line syntax of
+.Nm
+is supported by this implementation.
+.Pp
+This command is mostly compatible with GNU extensions to
+.Nm .
+.Sh SEE ALSO
+.Xr tail 1
+.Sh STANDARDS
+The
+.Nm
+utility conforms to
+.St -p1003.2-92 .
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Bx 3.0 .
+It was enhanced to include the
+.Fl c ,
+.Fl q ,
+and
+.Fl v
+options for
+.Nx 2.1 .
diff --git a/usr.bin/head/head.c b/usr.bin/head/head.c
new file mode 100644
index 0000000..1d24d48
--- /dev/null
+++ b/usr.bin/head/head.c
@@ -0,0 +1,204 @@
+/*	$NetBSD: head.c,v 1.24 2016/05/12 01:56:44 nonaka Exp $	*/
+
+/*
+ * Copyright (c) 1980, 1987, 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1992, 1993\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)head.c	8.2 (Berkeley) 5/4/95";
+#else
+__RCSID("$NetBSD: head.c,v 1.24 2016/05/12 01:56:44 nonaka Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+ * head - give the first few lines of a stream or of each of a set of files
+ *
+ * Bill Joy UCB August 24, 1977
+ */
+
+static void head(FILE *, intmax_t, intmax_t);
+static void obsolete(char *[]);
+__dead static void usage(void);
+
+
+int
+main(int argc, char *argv[])
+{
+	int ch;
+	FILE *fp;
+	int first;
+	intmax_t linecnt;
+	intmax_t bytecnt;
+	char *ep;
+	int eval = 0;
+	int qflag = 0;
+	int vflag = 0;
+
+	(void)setlocale(LC_ALL, "");
+	obsolete(argv);
+	linecnt = 10;
+	bytecnt = 0;
+	while ((ch = getopt(argc, argv, "c:n:qv")) != -1)
+		switch(ch) {
+		case 'c':
+			errno = 0;
+			bytecnt = strtoimax(optarg, &ep, 10);
+			if ((bytecnt == INTMAX_MAX && errno == ERANGE) ||
+			    *ep || bytecnt <= 0)
+				errx(1, "illegal byte count -- %s", optarg);
+			break;
+
+		case 'n':
+			errno = 0;
+			linecnt = strtoimax(optarg, &ep, 10);
+			if ((linecnt == INTMAX_MAX && errno == ERANGE) ||
+			    *ep || linecnt <= 0)
+				errx(1, "illegal line count -- %s", optarg);
+			break;
+
+		case 'q':
+			qflag = 1;
+			vflag = 0;
+			break;
+
+		case 'v':
+			qflag = 0;
+			vflag = 1;
+			break;
+
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (*argv)
+		for (first = 1; *argv; ++argv) {
+			if ((fp = fopen(*argv, "r")) == NULL) {
+				warn("%s", *argv);
+				eval = 1;
+				continue;
+			}
+			if (vflag || (qflag == 0 && argc > 1)) {
+				(void)printf("%s==> %s <==\n",
+				    first ? "" : "\n", *argv);
+				first = 0;
+			}
+			head(fp, linecnt, bytecnt);
+			(void)fclose(fp);
+		}
+	else
+		head(stdin, linecnt, bytecnt);
+	exit(eval);
+}
+
+static void
+head(FILE *fp, intmax_t cnt, intmax_t bytecnt)
+{
+	char buf[65536];
+	size_t len, rv, rv2;
+	int ch;
+
+	if (bytecnt) {
+		while (bytecnt) {
+			len = sizeof(buf);
+			if (bytecnt > (intmax_t)sizeof(buf))
+				len = sizeof(buf);
+			else
+				len = bytecnt;
+			rv = fread(buf, 1, len, fp);
+			if (rv == 0)
+				break; /* Distinguish EOF and error? */
+			rv2 = fwrite(buf, 1, rv, stdout);
+			if (rv2 != rv) {
+				if (feof(stdout))
+					errx(1, "EOF on stdout");
+				else
+					err(1, "failure writing to stdout");
+			}
+			bytecnt -= rv;
+		}
+	} else {
+		while ((ch = getc(fp)) != EOF) {
+			if (putchar(ch) == EOF)
+				err(1, "stdout");
+			if (ch == '\n' && --cnt == 0)
+				break;
+		}
+	}
+}
+
+static void
+obsolete(char *argv[])
+{
+	char *ap;
+
+	while ((ap = *++argv)) {
+		/* Return if "--" or not "-[0-9]*". */
+		if (ap[0] != '-' || ap[1] == '-' ||
+		    !isdigit((unsigned char)ap[1]))
+			return;
+		if ((ap = malloc(strlen(*argv) + 2)) == NULL)
+			err(1, NULL);
+		ap[0] = '-';
+		ap[1] = 'n';
+		(void)strcpy(ap + 2, *argv + 1);
+		*argv = ap;
+	}
+}
+
+static void
+usage(void)
+{
+
+	(void)fprintf(stderr, "usage: %s [-n lines] [file ...]\n",
+	    getprogname());
+	exit(1);
+}