1 /* vi: set sw=4 ts=4: */
3 * Mini head implementation for busybox
6 * Copyright (C) 1999,2000 by Lineo, inc.
7 * Written by John Beppu <beppu@lineo.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 const char head_usage[] =
30 "head [OPTION] [FILE]...\n"
31 #ifndef BB_FEATURE_TRIVIAL_HELP
32 "\nPrint first 10 lines of each FILE to standard output.\n"
33 "With more than one FILE, precede each with a header giving the\n"
34 "file name. With no FILE, or when FILE is -, read standard input.\n\n"
36 "Options:\n" "\t-n NUM\t\tPrint first NUM lines instead of first 10\n"
40 int head(int len, FILE * src)
45 for (i = 0; i < len; i++) {
46 fgets(buffer, 1024, src);
50 fputs(buffer, stdout);
55 /* BusyBoxed head(1) */
56 int head_main(int argc, char **argv)
59 int len = 10, tmplen, i;
62 for (i = 1; i < argc; i++) {
63 if (argv[i][0] == '-') {
69 tmplen = atoi(argv[i]);
78 fprintf(stderr, "head: invalid option -- %c\n", opt);
86 /* get rest of argv[] or stdin if nothing's left */
91 int need_headers = ((argc - i) > 1);
93 for (; i < argc; i++) {
96 src = fopen(argv[i], "r");
98 fprintf(stderr, "head: %s: %s\n", argv[i],
101 /* emulating GNU behaviour */
103 fprintf(stdout, "==> %s <==\n", argv[i]);
107 fprintf(stdout, "\n");
115 /* $Id: head.c,v 1.11 2000/06/19 17:25:39 andersen Exp $ */