busybox

/* vi: set sw=4 ts=4: */

/*

 * head implementation for busybox

 *

 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>

 *

 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.

 */

​

/* 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 "libbb.h"

​

static const char head_opts[] ALIGN1 =

    "n:"

#if ENABLE_FEATURE_FANCY_HEAD

    "c:qv"

#endif

    ;

​

#if ENABLE_FEATURE_FANCY_HEAD

static const struct suffix_mult head_suffixes[] = {

    { "b", 512 },

    { "k", 1024 },

    { "m", 1024*1024 },

    { }

};

#endif

​

static const char header_fmt_str[] ALIGN1 = "\n==> %s <==\n";

​

int head_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;

int head_main(int argc, char **argv)

{

    unsigned long count = 10;

    unsigned long i;

#if ENABLE_FEATURE_FANCY_HEAD

    int count_bytes = 0;

    int header_threshhold = 1;

#endif

​

    FILE *fp;

    const char *fmt;

    char *p;

    int opt;

    int c;

    int retval = EXIT_SUCCESS;

​

#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])

    ) {

        --argc;

        ++argv;

        p = (*argv) + 1;

        goto GET_COUNT;

    }

#endif

​

    /* No size benefit in converting this to getopt32 */