diff options
Diffstat (limited to 'head.c')
-rw-r--r-- | head.c | 97 |
1 files changed, 0 insertions, 97 deletions
@@ -1,97 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * Mini head implementation for busybox - * - * - * Copyright (C) 1999,2000,2001 by Lineo, inc. - * Written by John Beppu <beppu@lineo.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <stdio.h> -#include <getopt.h> -#include <stdlib.h> -#include <string.h> -#include "busybox.h" - -static int head(int len, FILE *fp) -{ - int i; - char *input; - - for (i = 0; i < len; i++) { - if ((input = get_line_from_file(fp)) == NULL) - break; - fputs(input, stdout); - free(input); - } - return 0; -} - -/* BusyBoxed head(1) */ -int head_main(int argc, char **argv) -{ - FILE *fp; - int need_headers, opt, len = 10, status = EXIT_SUCCESS; - - /* parse argv[] */ - while ((opt = getopt(argc, argv, "n:")) > 0) { - switch (opt) { - case 'n': - len = atoi(optarg); - if (len >= 1) - break; - /* fallthrough */ - default: - show_usage(); - } - } - - /* get rest of argv[] or stdin if nothing's left */ - if (argv[optind] == NULL) { - head(len, stdin); - return status; - } - - need_headers = optind != (argc - 1); - while (argv[optind]) { - if (strcmp(argv[optind], "-") == 0) { - fp = stdin; - argv[optind] = "standard input"; - } else { - if ((fp = wfopen(argv[optind], "r")) == NULL) - status = EXIT_FAILURE; - } - if (fp) { - if (need_headers) { - printf("==> %s <==\n", argv[optind]); - } - head(len, fp); - if (ferror(fp)) { - perror_msg("%s", argv[optind]); - status = EXIT_FAILURE; - } - if (optind < argc - 1) - putchar('\n'); - if (fp != stdin) - fclose(fp); - } - optind++; - } - - return status; -} |