*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* BB_AUDIT SUSv3 compliant */
/* BB_AUDIT GNU compatible -c, -q, and -v options in 'fancy' configuration. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/head.html */
-#include <stdio.h>
-#include <stdlib.h>
-#include <limits.h>
-#include <ctype.h>
-#include <unistd.h>
-#include "busybox.h"
+//usage:#define head_trivial_usage
+//usage: "[OPTIONS] [FILE]..."
+//usage:#define head_full_usage "\n\n"
+//usage: "Print first 10 lines of each FILE (or stdin) to stdout.\n"
+//usage: "With more than one FILE, precede each with a filename header.\n"
+//usage: "\n -n N[kbm] Print first N lines"
+//usage: IF_FEATURE_FANCY_HEAD(
+//usage: "\n -c N[kbm] Print first N bytes"
+//usage: "\n -q Never print headers"
+//usage: "\n -v Always print headers"
+//usage: )
+//usage: "\n"
+//usage: "\nN may be suffixed by k (x1024), b (x512), or m (x1024^2)."
+//usage:
+//usage:#define head_example_usage
+//usage: "$ head -n 2 /etc/passwd\n"
+//usage: "root:x:0:0:root:/root:/bin/bash\n"
+//usage: "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
+
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
-static const char head_opts[] =
+static const char head_opts[] ALIGN1 =
"n:"
#if ENABLE_FEATURE_FANCY_HEAD
"c:qv"
#endif
;
-static const char header_fmt_str[] = "\n==> %s <==\n";
+static const struct suffix_mult head_suffixes[] = {
+ { "b", 512 },
+ { "k", 1024 },
+ { "m", 1024*1024 },
+ { "", 0 }
+};
+#define header_fmt_str "\n==> %s <==\n"
+
+int head_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int head_main(int argc, char **argv)
{
unsigned long count = 10;
int count_bytes = 0;
int header_threshhold = 1;
#endif
-
FILE *fp;
const char *fmt;
char *p;
int c;
int retval = EXIT_SUCCESS;
-#if defined CONFIG_FEATURE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD
+#if ENABLE_INCLUDE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD
/* Allow legacy syntax of an initial numeric option without -n. */
- if ((argc > 1) && (argv[1][0] == '-')
- /* && (isdigit)(argv[1][1]) */
- && (((unsigned int)(argv[1][1] - '0')) <= 9)
+ if (argv[1] && argv[1][0] == '-'
+ && isdigit(argv[1][1])
) {
--argc;
++argv;
}
#endif
- /* No size benefit in converting this to bb_getopt_ulflags */
+ /* No size benefit in converting this to getopt32 */
while ((opt = getopt(argc, argv, head_opts)) > 0) {
- switch(opt) {
+ switch (opt) {
#if ENABLE_FEATURE_FANCY_HEAD
- case 'q':
- header_threshhold = INT_MAX;
- break;
- case 'v':
- header_threshhold = -1;
- break;
- case 'c':
- count_bytes = 1;
- /* fall through */
+ case 'q':
+ header_threshhold = INT_MAX;
+ break;
+ case 'v':
+ header_threshhold = -1;
+ break;
+ case 'c':
+ count_bytes = 1;
+ /* fall through */
#endif
- case 'n':
- p = optarg;
-#if ENABLE_FEATURE_FANCY_HEAD
- GET_COUNT:
+ case 'n':
+ p = optarg;
+#if ENABLE_INCLUDE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD
+ GET_COUNT:
#endif
- count = bb_xgetularg10(p);
- break;
- default:
- bb_show_usage();
+ count = xatoul_sfx(p, head_suffixes);
+ break;
+ default:
+ bb_show_usage();
}
}
+ argc -= optind;
argv += optind;
- if (!*argv) {
- *--argv = "-";
- }
+ if (!*argv)
+ *--argv = (char*)"-";
fmt = header_fmt_str + 1;
#if ENABLE_FEATURE_FANCY_HEAD
- if (argc - optind <= header_threshhold) {
+ if (argc <= header_threshhold) {
header_threshhold = 0;
}
#else
- if (argc <= optind + 1) {
- fmt += 11;
+ if (argc <= 1) {
+ fmt += 11; /* "" */
}
/* Now define some things here to avoid #ifdefs in the code below.
* These should optimize out of the if conditions below. */
#endif
do {
- if ((fp = bb_wfopen_input(*argv)) != NULL) {
+ fp = fopen_or_warn_stdin(*argv);
+ if (fp) {
if (fp == stdin) {
*argv = (char *) bb_msg_standard_input;
}
if (header_threshhold) {
- bb_printf(fmt, *argv);
+ printf(fmt, *argv);
}
i = count;
while (i && ((c = getc(fp)) != EOF)) {
}
putchar(c);
}
- if (bb_fclose_nonstdin(fp)) {
- bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */
+ if (fclose_if_not_stdin(fp)) {
+ bb_simple_perror_msg(*argv);
retval = EXIT_FAILURE;
}
- bb_xferror_stdout();
+ die_if_ferror_stdout();
+ } else {
+ retval = EXIT_FAILURE;
}
fmt = header_fmt_str;
} while (*++argv);
- bb_fflush_stdout_and_exit(retval);
+ fflush_stdout_and_exit(retval);
}
projects / oweals / busybox.git / blobdiff