add support for:
-q quiet; never show filename headers -v verbose; always show headers -c <bytecount>; count <bytecount> bytes, not lines as seen in GNU head(1).
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mrg
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53e1c6f576
@ -1,4 +1,4 @@
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.\" $NetBSD: head.1,v 1.10 2003/08/07 11:14:02 agc Exp $
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.\" $NetBSD: head.1,v 1.11 2004/05/04 10:57:42 mrg 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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@ -29,7 +29,7 @@
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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 July 14, 1993
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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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@ -37,7 +37,9 @@
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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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@ -47,13 +49,20 @@ 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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.Ar byte_count
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is specified, head counts bytes instead of lines.
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.Pp
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If more than a single file is specified, each file is preceded by a
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header consisting of the string
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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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@ -62,6 +71,9 @@ utility exits 0 on success, and \*[Gt]0 if an error occurs.
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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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@ -74,3 +86,10 @@ 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 q ,
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.Fl v
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and
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.Fl c
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options for
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.Nx 2.1 .
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@ -1,4 +1,4 @@
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/* $NetBSD: head.c,v 1.17 2004/01/05 23:23:34 jmmv Exp $ */
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/* $NetBSD: head.c,v 1.18 2004/05/04 10:57:42 mrg Exp $ */
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/*
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* Copyright (c) 1980, 1987, 1992, 1993
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@ -39,7 +39,7 @@ __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1992, 1993\n\
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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 1.17 2004/01/05 23:23:34 jmmv Exp $");
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__RCSID("$NetBSD: head.c,v 1.18 2004/05/04 10:57:42 mrg Exp $");
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#endif
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#endif /* not lint */
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@ -61,7 +61,7 @@ __RCSID("$NetBSD: head.c,v 1.17 2004/01/05 23:23:34 jmmv Exp $");
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* Bill Joy UCB August 24, 1977
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*/
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void head __P((FILE *, long));
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void head __P((FILE *, long, long));
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void obsolete __P((char *[]));
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void usage __P((void));
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int main __P((int, char *[]));
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@ -77,13 +77,27 @@ main(argc, argv)
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FILE *fp;
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int first;
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long linecnt;
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long bytecnt;
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char *ep;
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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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while ((ch = getopt(argc, argv, "n:")) != -1)
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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 = strtol(optarg, &ep, 10);
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if ((bytecnt == LONG_MIN || bytecnt == LONG_MAX) &&
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errno == ERANGE)
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err(1, "illegal byte count -- %s", optarg);
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else if (*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 = strtol(optarg, &ep, 10);
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@ -94,6 +108,16 @@ main(argc, argv)
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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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@ -108,31 +132,34 @@ main(argc, argv)
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eval = 1;
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continue;
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}
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if (argc > 1) {
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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);
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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);
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head(stdin, linecnt, bytecnt);
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exit(eval);
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}
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void
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head(fp, cnt)
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head(fp, cnt, bytecnt)
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FILE *fp;
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long cnt;
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long bytecnt;
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{
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int ch;
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if (bytecnt)
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cnt = bytecnt;
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while (cnt--)
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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')
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if (ch == '\n' || bytecnt)
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break;
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}
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}
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