Importing usr.bin/head
This commit is contained in:
Thomas Cort
Lionel Sambuc
parent
d5a4c35980
commit
ab046ee6ea
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@ -10,7 +10,7 @@ SUBDIR= add_route arp ash at backup basename btrace \
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dhrystone diff dirname diskctl dumpcore \
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eject env expand factor fbdctl \
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find finger fingerd fix fold format fortune fsck.mfs \
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ftp101 gcore gcov-pull getty grep head hexdump host \
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ftp101 gcore gcov-pull getty grep hexdump host \
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hostaddr id ifconfig ifdef \
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intr ipcrm ipcs irdpd isoread last \
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less loadkeys loadramdisk logger look lp \
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@ -1,4 +0,0 @@
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PROG= head
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MAN=
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.include <bsd.prog.mk>
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@ -1,88 +0,0 @@
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/* head - print the first few lines of a file Author: Andy Tanenbaum */
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define DEFAULT 10
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int main(int argc, char **argv);
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void do_file(int n, FILE *f);
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void usage(void);
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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FILE *f;
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int legacy, n, k, nfiles;
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char *ptr;
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/* Check for flags. One can only specify how many lines to print. */
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k = 1;
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n = DEFAULT;
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legacy = 0;
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for (k = 1; k < argc && argv[k][0] == '-'; k++) {
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ptr = &argv[k][1];
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if (ptr[0] == 'n' && ptr[1] == 0) {
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k++;
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if (k >= argc) usage();
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ptr = argv[k];
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}
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else if (ptr[0] == '-' && ptr[1] == 0) {
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k++;
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break;
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}
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else if (++legacy > 1) usage();
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n = atoi(ptr);
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if (n <= 0) usage();
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}
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nfiles = argc - k;
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if (nfiles == 0) {
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/* Print standard input only. */
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do_file(n, stdin);
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exit(0);
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}
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/* One or more files have been listed explicitly. */
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while (k < argc) {
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if (nfiles > 1) printf("==> %s <==\n", argv[k]);
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if ((f = fopen(argv[k], "r")) == NULL)
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fprintf(stderr, "%s: cannot open %s: %s\n",
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argv[0], argv[k], strerror(errno));
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else {
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do_file(n, f);
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fclose(f);
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}
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k++;
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if (k < argc) printf("\n");
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}
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return(0);
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}
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void do_file(n, f)
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int n;
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FILE *f;
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{
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int c;
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/* Print the first 'n' lines of a file. */
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while (n) switch (c = getc(f)) {
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case EOF:
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return;
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case '\n':
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--n;
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default: putc((char) c, stdout);
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}
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}
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void usage()
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{
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fprintf(stderr, "Usage: head [-lines | -n lines] [file ...]\n");
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exit(1);
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}
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@ -6,7 +6,7 @@ MAN= ash.1 at.1 basename.1 \
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dumpcore.1 eject.1 \
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env.1 expand.1 factor.1 \
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finger.1 flexdoc.1 fold.1 format.1 fortune.1 \
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fsck.mfs.1 head.1 host.1 hostaddr.1 ifdef.1 \
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fsck.mfs.1 host.1 hostaddr.1 ifdef.1 \
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isodir.1 isoinfo.1 isoread.1 \
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last.1 loadfont.1 loadkeys.1 logger.1 \
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look.1 lp.1 lspci.1 mail.1 \
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@ -1,37 +0,0 @@
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.TH HEAD 1
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.SH NAME
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head \- print the first few lines of a file
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.SH SYNOPSIS
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\fBhead\fR [\fB\-\fIn\fR | \fB\-n\fR \fIn\fR]\fR [\fIfile\fR] ...\fR
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH OPTIONS
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.TP 5
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.B \-n \fIn\fR
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# How many lines to print
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.TP 5
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.B \-\fIn\fR
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# How many lines to print (backwards-compatible)
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.SH EXAMPLES
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.TP 20
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.B head \-n 6
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# Print first 6 lines of \fIstdin\fR
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.TP 20
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.B head \-1 file1 file2
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# Print first line of two files
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.SH DESCRIPTION
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.PP
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The first few lines of one or more files are printed.
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The default count is 10 lines.
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The default file is \fIstdin\fR.
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.SH "SEE ALSO"
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.BR tail (1).
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@ -130,6 +130,7 @@
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2012/10/17 12:00:00,usr.bin/col
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2012/10/17 12:00:00,usr.bin/ctags
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2011/09/01 13:37:33,usr.bin/du
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2013/03/18 12:00:00,usr.bin/head
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2012/10/17 12:00:00,usr.bin/genassym
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2013/03/09 12:00:00,usr.bin/getopt
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2012/10/17 12:00:00,usr.bin/gzip
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@ -11,7 +11,7 @@ SUBDIR= \
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du \
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\
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\
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genassym getopt \
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genassym getopt head \
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indent infocmp join \
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ldd \
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login lorder m4 \
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@ -0,0 +1,6 @@
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# $NetBSD: Makefile,v 1.4 1997/10/18 13:15:18 mrg Exp $
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# from: @(#)Makefile 8.1 (Berkeley) 6/6/93
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PROG= head
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.include <bsd.prog.mk>
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@ -0,0 +1,97 @@
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.\" $NetBSD: head.1,v 1.12 2004/05/04 23:44:21 wiz Exp $
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.\"
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.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)head.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd May 4, 2004
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.Dt HEAD 1
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.Os
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.Sh NAME
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.Nm head
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.Nd display first lines of a file
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.Sh SYNOPSIS
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.Nm
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.Op Fl qv
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.Op Fl n Ar count
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.Op Fl c Ar byte_count
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.Op Ar file ...
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.Sh DESCRIPTION
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This filter displays the first
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.Ar count
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lines of each of the specified files, or of the standard input if no
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files are specified.
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If
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.Ar count
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is omitted it defaults to 10.
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If
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.Fl c Ar byte_count
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is specified,
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.Nm
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counts bytes instead of lines.
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.Pp
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If more than a single file is specified, or the
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.Fl v
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option is used, each file is preceded by a header consisting of the string
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.Dq ==\*[Gt] XXX \*[Le]=
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where
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.Dq XXX
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is the name of the file.
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The
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.Fl q
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flag disables the printing of the header in all cases.
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.Pp
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The
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.Nm
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utility exits 0 on success, and \*[Gt]0 if an error occurs.
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.Sh COMPATIBILITY
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The historic command line syntax of
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.Nm
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is supported by this implementation.
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.Pp
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This command is mostly compatible with GNU extensions to
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.Nm .
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.Sh SEE ALSO
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.Xr tail 1
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.2-92 .
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Bx 3.0 .
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It was enhanced to include the
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.Fl c ,
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.Fl q ,
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and
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.Fl v
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options for
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.Nx 2.1 .
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@ -0,0 +1,204 @@
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/* $NetBSD: head.c,v 1.23 2010/03/31 21:55:23 joerg Exp $ */
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/*
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* Copyright (c) 1980, 1987, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1992, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)head.c 8.2 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: head.c,v 1.23 2010/03/31 21:55:23 joerg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* head - give the first few lines of a stream or of each of a set of files
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*
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* Bill Joy UCB August 24, 1977
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*/
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static void head(FILE *, intmax_t, intmax_t);
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static void obsolete(char *[]);
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__dead static void usage(void);
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int
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main(int argc, char *argv[])
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{
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int ch;
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FILE *fp;
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int first;
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uintmax_t linecnt;
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uintmax_t bytecnt;
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char *ep;
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int eval = 0;
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int qflag = 0;
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int vflag = 0;
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(void)setlocale(LC_ALL, "");
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obsolete(argv);
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linecnt = 10;
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bytecnt = 0;
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while ((ch = getopt(argc, argv, "c:n:qv")) != -1)
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switch(ch) {
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case 'c':
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errno = 0;
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bytecnt = strtoimax(optarg, &ep, 10);
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if ((bytecnt == INTMAX_MAX && errno == ERANGE) ||
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*ep || bytecnt <= 0)
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errx(1, "illegal byte count -- %s", optarg);
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break;
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case 'n':
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errno = 0;
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linecnt = strtoimax(optarg, &ep, 10);
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if ((linecnt == INTMAX_MAX && errno == ERANGE) ||
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*ep || linecnt <= 0)
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errx(1, "illegal line count -- %s", optarg);
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break;
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case 'q':
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qflag = 1;
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vflag = 0;
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break;
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case 'v':
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qflag = 0;
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vflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (*argv)
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for (first = 1; *argv; ++argv) {
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if ((fp = fopen(*argv, "r")) == NULL) {
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warn("%s", *argv);
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eval = 1;
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continue;
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}
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if (vflag || (qflag == 0 && argc > 1)) {
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(void)printf("%s==> %s <==\n",
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first ? "" : "\n", *argv);
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first = 0;
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}
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head(fp, linecnt, bytecnt);
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(void)fclose(fp);
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}
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else
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head(stdin, linecnt, bytecnt);
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exit(eval);
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}
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static void
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head(FILE *fp, intmax_t cnt, intmax_t bytecnt)
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{
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char buf[65536];
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size_t len, rv, rv2;
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int ch;
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if (bytecnt) {
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while (bytecnt) {
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len = sizeof(buf);
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if (bytecnt > (intmax_t)sizeof(buf))
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len = sizeof(buf);
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else
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len = bytecnt;
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rv = fread(buf, 1, len, fp);
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if (rv == 0)
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break; /* Distinguish EOF and error? */
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rv2 = fwrite(buf, 1, rv, stdout);
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if (rv2 != rv) {
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if (feof(stdout))
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errx(1, "EOF on stdout");
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else
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err(1, "failure writing to stdout");
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}
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bytecnt -= rv;
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}
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} else {
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while ((ch = getc(fp)) != EOF) {
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if (putchar(ch) == EOF)
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err(1, "stdout");
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if (ch == '\n' && --cnt == 0)
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break;
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}
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}
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}
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static void
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obsolete(char *argv[])
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{
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char *ap;
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while ((ap = *++argv)) {
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/* Return if "--" or not "-[0-9]*". */
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if (ap[0] != '-' || ap[1] == '-' ||
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!isdigit((unsigned char)ap[1]))
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return;
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if ((ap = malloc(strlen(*argv) + 2)) == NULL)
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err(1, NULL);
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ap[0] = '-';
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ap[1] = 'n';
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(void)strcpy(ap + 2, *argv + 1);
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*argv = ap;
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}
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-n lines] [file ...]\n",
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getprogname());
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exit(1);
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}
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