1 /* vi: set sw=4 ts=4: */
3 * Mini head implementation for busybox
5 * Copyright (C) 1999 by Lineo, inc. and John Beppu
6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 static int head(int len, FILE *fp)
36 for (i = 0; i < len; i++) {
37 if ((input = get_line_from_file(fp)) == NULL)
45 /* BusyBoxed head(1) */
46 int head_main(int argc, char **argv)
49 int need_headers, opt, len = 10, status = EXIT_SUCCESS;
51 if (( argc >= 2 ) && ( argv [1][0] == '-' ) && isdigit ( argv [1][1] )) {
52 len = atoi ( &argv [1][1] );
57 while ((opt = getopt(argc, argv, "n:")) > 0) {
69 /* get rest of argv[] or stdin if nothing's left */
70 if (argv[optind] == NULL) {
75 need_headers = optind != (argc - 1);
76 while (argv[optind]) {
77 if (strcmp(argv[optind], "-") == 0) {
79 argv[optind] = "standard input";
81 if ((fp = wfopen(argv[optind], "r")) == NULL)
82 status = EXIT_FAILURE;
86 printf("==> %s <==\n", argv[optind]);
90 perror_msg("%s", argv[optind]);
91 status = EXIT_FAILURE;
93 if (optind < argc - 1)