busybox

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

/*

 * split - split a file into pieces

 * Copyright (c) 2007 Bernhard Reutner-Fischer

 *

 * Licensed under GPLv2 or later, see file LICENSE in this source tree.

 */

/* BB_AUDIT: SUSv3 compliant

 * SUSv3 requirements:

 * http://www.opengroup.org/onlinepubs/009695399/utilities/split.html

 */

​

//usage:#define split_trivial_usage

//usage:       "[OPTIONS] [INPUT [PREFIX]]"

//usage:#define split_full_usage "\n\n"

//usage:       "    -b N[k|m]   Split by N (kilo|mega)bytes"

//usage:     "\n    -l N        Split by N lines"

//usage:     "\n    -a N        Use N letters as suffix"

//usage:

//usage:#define split_example_usage

//usage:       "$ split TODO foo\n"

//usage:       "$ cat TODO | split -a 2 -l 2 TODO_\n"

​

#include "libbb.h"

​

#if ENABLE_FEATURE_SPLIT_FANCY

static const struct suffix_mult split_suffixes[] = {

    { "b", 512 },

    { "k", 1024 },

    { "m", 1024*1024 },

    { "g", 1024*1024*1024 },

    { "", 0 }

};

#endif

​

/* Increment the suffix part of the filename.

 * Returns NULL if we are out of filenames.

 */

static char *next_file(char *old, unsigned suffix_len)

{

    size_t end = strlen(old);

    unsigned i = 1;

    char *curr;

​

    while (1) {

        curr = old + end - i;

        if (*curr < 'z') {

            *curr += 1;

            break;

        }

        i++;

        if (i > suffix_len) {

            return NULL;

        }

        *curr = 'a';

    }

​

    return old;

}

​

#define read_buffer bb_common_bufsiz1

enum { READ_BUFFER_SIZE = COMMON_BUFSIZE - 1 };

​