mirror of
https://github.com/sheumann/hush.git
synced 2024-12-28 07:30:23 +00:00
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini head implementation for busybox
|
|
*
|
|
*
|
|
* Copyright (C) 1999,2000 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 "busybox.h"
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
|
|
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:
|
|
usage(head_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) {
|
|
fprintf(stdout, "==> %s <==\n", argv[optind]);
|
|
}
|
|
head(len, fp);
|
|
if (errno) {
|
|
errorMsg("%s: %s\n", argv[optind], strerror(errno));
|
|
status = EXIT_FAILURE;
|
|
errno = 0;
|
|
}
|
|
if (optind < argc - 1)
|
|
fprintf(stdout, "\n");
|
|
if (fp != stdin)
|
|
fclose(fp);
|
|
}
|
|
optind++;
|
|
}
|
|
|
|
return status;
|
|
}
|