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https://git.busybox.net/busybox.git
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104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini head implementation for busybox
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*
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*
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* Copyright (C) 1999,2000 by Lineo, inc.
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* Written by John Beppu <beppu@lineo.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "busybox.h"
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#include <errno.h>
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#include <stdio.h>
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int head(int len, FILE * src)
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{
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int i;
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char buffer[1024];
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for (i = 0; i < len; i++) {
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fgets(buffer, 1024, src);
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if (feof(src)) {
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break;
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}
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fputs(buffer, stdout);
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}
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return 0;
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}
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/* BusyBoxed head(1) */
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int head_main(int argc, char **argv)
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{
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char opt;
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int len = 10, tmplen, i;
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/* parse argv[] */
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-') {
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opt = argv[i][1];
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switch (opt) {
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case 'n':
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tmplen = 0;
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if (++i < argc)
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tmplen = atoi(argv[i]);
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if (tmplen < 1)
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usage(head_usage);
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len = tmplen;
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break;
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case '-':
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case 'h':
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usage(head_usage);
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default:
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errorMsg("invalid option -- %c\n", opt);
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usage(head_usage);
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}
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} else {
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break;
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}
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}
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/* get rest of argv[] or stdin if nothing's left */
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if (i >= argc) {
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head(len, stdin);
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} else {
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int need_headers = ((argc - i) > 1);
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for (; i < argc; i++) {
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FILE *src;
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src = fopen(argv[i], "r");
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if (!src) {
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errorMsg("%s: %s\n", argv[i], strerror(errno));
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} else {
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/* emulating GNU behaviour */
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if (need_headers) {
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fprintf(stdout, "==> %s <==\n", argv[i]);
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}
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head(len, src);
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if (i < argc - 1) {
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fprintf(stdout, "\n");
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}
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}
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}
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}
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return(0);
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}
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/* $Id: head.c,v 1.14 2000/09/25 21:45:57 andersen Exp $ */
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