mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 16:31:24 +00:00
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
|
|
* Mini head implementation for busybox
|
|
*
|
|
*
|
|
* Copyright (C) 1999 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 "internal.h"
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
|
|
const char head_usage[] =
|
|
"Usage: head [FILE]...\n\n"
|
|
"Print first 10 lines of each FILE to standard output.\n"
|
|
"With more than one FILE, precede each with a header giving the\n"
|
|
"file name. With no FILE, or when FILE is -, read standard input.\n";
|
|
|
|
int
|
|
head(int len, FILE *src)
|
|
{
|
|
int i;
|
|
char buffer[1024];
|
|
|
|
for (i = 0; i < len; i++) {
|
|
fgets(buffer, 1024, src);
|
|
if (feof(src)) { break; }
|
|
fputs(buffer, stdout);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* BusyBoxed head(1) */
|
|
int
|
|
head_main(int argc, char **argv)
|
|
{
|
|
int i = 1;
|
|
char opt;
|
|
int len = 10;
|
|
|
|
/* 1st option is potentially special */
|
|
if ((argc > 1) && (argv[1][0] == '-') && isDecimal(argv[1][1])) {
|
|
int tmplen = atoi(&argv[1][1]);
|
|
if (tmplen) { len = tmplen; }
|
|
i = 2;
|
|
}
|
|
|
|
/* parse argv[] */
|
|
for ( ; i < argc; i++) {
|
|
if (argv[i][0] == '-') {
|
|
opt = argv[i][1];
|
|
switch (opt) {
|
|
case '-':
|
|
break;
|
|
case 'h':
|
|
usage(head_usage);
|
|
default:
|
|
fprintf(stderr, "head: invalid option -- %c\n", opt);
|
|
usage(head_usage);
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* get rest of argv[] or stdin if nothing's left */
|
|
if (i >= argc) {
|
|
head(len, stdin);
|
|
|
|
} else {
|
|
int need_headers = ((argc - i) > 1);
|
|
for ( ; i < argc; i++) {
|
|
FILE *src;
|
|
src = fopen(argv[i], "r");
|
|
if (!src) {
|
|
fprintf(stderr,"head: %s: %s\n", argv[i], strerror(errno));
|
|
} else {
|
|
/* emulating GNU behaviour */
|
|
if (need_headers) {
|
|
fprintf(stdout, "==> %s <==\n", argv[i]);
|
|
}
|
|
head(len, src);
|
|
if (i < argc - 1) {
|
|
fprintf(stdout, "\n");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/* $Id: head.c,v 1.3 1999/12/15 19:29:09 beppu Exp $ */
|