linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Helper function for splitting a string into an argv-like array.

 */

​

#include <linux/kernel.h>

#include <linux/ctype.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/export.h>

​

static int count_argc(const char *str)

{

    int count = 0;

    bool was_space;

​

    for (was_space = true; *str; str++) {

        if (isspace(*str)) {

            was_space = true;

        } else if (was_space) {

            was_space = false;

            count++;

        }

    }

​

    return count;

}

​

/**

 * argv_free - free an argv

 * @argv - the argument vector to be freed

 *

 * Frees an argv and the strings it points to.

 */

void argv_free(char **argv)

{

    argv--;

    kfree(argv[0]);

    kfree(argv);

}

EXPORT_SYMBOL(argv_free);

​

/**

 * argv_split - split a string at whitespace, returning an argv

 * @gfp: the GFP mask used to allocate memory

 * @str: the string to be split

 * @argcp: returned argument count

 *

 * Returns an array of pointers to strings which are split out from

 * @str.  This is performed by strictly splitting on white-space; no

 * quote processing is performed.  Multiple whitespace characters are

 * considered to be a single argument separator.  The returned array

 * is always NULL-terminated.  Returns NULL on memory allocation

 * failure.

 *

 * The source string at `str' may be undergoing concurrent alteration via

 * userspace sysctl activity (at least).  The argv_split() implementation

 * attempts to handle this gracefully by taking a local copy to work on.

 */

char **argv_split(gfp_t gfp, const char *str, int *argcp)

{

    char *argv_str;

    bool was_space;