168 lines
4.0 KiB
C
168 lines
4.0 KiB
C
/* $NetBSD: head.c,v 1.16 2003/08/07 11:14:02 agc 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\n\
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The Regents of the University of California. All rights reserved.\n");
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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 1.16 2003/08/07 11:14:02 agc 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 <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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void head __P((FILE *, 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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int eval = 0;
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int
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main(argc, argv)
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int argc;
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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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long linecnt;
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char *ep;
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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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switch(ch) {
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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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if ((linecnt == LONG_MIN || linecnt == LONG_MAX) &&
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errno == ERANGE)
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err(1, "illegal line count -- %s", optarg);
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else if (*ep || linecnt <= 0)
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errx(1, "illegal line count -- %s", optarg);
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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 (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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(void)fclose(fp);
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}
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else
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head(stdin, linecnt);
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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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FILE *fp;
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long cnt;
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{
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int ch;
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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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break;
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}
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}
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void
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obsolete(argv)
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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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void
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usage()
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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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