linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * lib/parser.c - simple parser for mount, etc. options.

 */

​

#include <linux/ctype.h>

#include <linux/types.h>

#include <linux/export.h>

#include <linux/parser.h>

#include <linux/slab.h>

#include <linux/string.h>

​

/**

 * match_one: - Determines if a string matches a simple pattern

 * @s: the string to examine for presence of the pattern

 * @p: the string containing the pattern

 * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match

 * locations.

 *

 * Description: Determines if the pattern @p is present in string @s. Can only

 * match extremely simple token=arg style patterns. If the pattern is found,

 * the location(s) of the arguments will be returned in the @args array.

 */

static int match_one(char *s, const char *p, substring_t args[])

{

    char *meta;

    int argc = 0;

​

    if (!p)

        return 1;

​

    while(1) {

        int len = -1;

        meta = strchr(p, '%');

        if (!meta)

            return strcmp(p, s) == 0;

​

        if (strncmp(p, s, meta-p))

            return 0;

​

        s += meta - p;

        p = meta + 1;

​

        if (isdigit(*p))

            len = simple_strtoul(p, (char **) &p, 10);

        else if (*p == '%') {

            if (*s++ != '%')

                return 0;

            p++;

            continue;

        }

​

        if (argc >= MAX_OPT_ARGS)

            return 0;

​

        args[argc].from = s;

        switch (*p++) {

        case 's': {

            size_t str_len = strlen(s);

​

            if (str_len == 0)

                return 0;

            if (len == -1 || len > str_len)