/*
 * lib/parser.c - simple parser for mount, etc. options.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/ctype.h>
#include <linux/module.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 presense 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, 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, &p, 10);
                else if (*p == '%') {
                        if (*s++ != '%')
                                return 0;
                        continue;
                }

                if (argc >= MAX_OPT_ARGS)
                        return 0;

                args[argc].from = s;
                switch (*p++) {
                case 's':
                        if (strlen(s) == 0)
                                return 0;
                        else if (len == -1 || len > strlen(s))
                                len = strlen(s);
                        args[argc].to = s + len;
                        break;
                case 'd':
                        simple_strtol(s, &args[argc].to, 0);
                        goto num;
                case 'u':
                        simple_strtoul(s, &args[argc].to, 0);
                        goto num;
                case 'o':
                        simple_strtoul(s, &args[argc].to, 8);
                        goto num;
                case 'x':
                        simple_strtoul(s, &args[argc].to, 16);
                num:
                        if (args[argc].to == args[argc].from)
                                return 0;
                        break;
                default:
                        return 0;
                }
                s = args[argc].to;
                argc++;
        }
}

/**
 * match_token: - Find a token (and optional args) in a string
 * @s: the string to examine for token/argument pairs
 * @table: match_table_t describing the set of allowed option tokens and the
 * arguments that may be associated with them. Must be terminated with a
 * &struct match_token whose pattern is set to the NULL pointer.
 * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match
 * locations.
 *
 * Description: Detects which if any of a set of token strings has been passed
 * to it. Tokens can include up to MAX_OPT_ARGS instances of basic c-style
 * format identifiers which will be taken into account when matching the
 * tokens, and whose locations will be returned in the @args array.
 */
int match_token(char *s, match_table_t table, substring_t args[])
{
        struct match_token *p;

        for (p = table; !match_one(s, p->pattern, args) ; p++)
                ;

        return p->token;
}

/**
 * match_number: scan a number in the given base from a substring_t
 * @s: substring to be scanned
 * @result: resulting integer on success
 * @base: base to use when converting string
 *
 * Description: Given a &substring_t and a base, attempts to parse the substring
 * as a number in that base. On success, sets @result to the integer represented
 * by the string and returns 0. Returns either -ENOMEM or -EINVAL on failure.
 */
static int match_number(substring_t *s, int *result, int base)
{
        char *endp;
        char *buf;
        int ret;

        buf = kmalloc(s->to - s->from + 1, GFP_KERNEL);
        if (!buf)
                return -ENOMEM;
        memcpy(buf, s->from, s->to - s->from);
        buf[s->to - s->from] = '\0';
        *result = simple_strtol(buf, &endp, base);
        ret = 0;
        if (endp == buf)
                ret = -EINVAL;
        kfree(buf);
        return ret;
}

/**
 * match_int: - scan a decimal representation of an integer from a substring_t
 * @s: substring_t to be scanned
 * @result: resulting integer on success
 *
 * Description: Attempts to parse the &substring_t @s as a decimal integer. On
 * success, sets @result to the integer represented by the string and returns 0.
 * Returns either -ENOMEM or -EINVAL on failure.
 */
int match_int(substring_t *s, int *result)
{
        return match_number(s, result, 0);
}

/**
 * match_octal: - scan an octal representation of an integer from a substring_t
 * @s: substring_t to be scanned
 * @result: resulting integer on success
 *
 * Description: Attempts to parse the &substring_t @s as an octal integer. On
 * success, sets @result to the integer represented by the string and returns
 * 0. Returns either -ENOMEM or -EINVAL on failure.
 */
int match_octal(substring_t *s, int *result)
{
        return match_number(s, result, 8);
}

/**
 * match_hex: - scan a hex representation of an integer from a substring_t
 * @s: substring_t to be scanned
 * @result: resulting integer on success
 *
 * Description: Attempts to parse the &substring_t @s as a hexadecimal integer.
 * On success, sets @result to the integer represented by the string and
 * returns 0. Returns either -ENOMEM or -EINVAL on failure.
 */
int match_hex(substring_t *s, int *result)
{
        return match_number(s, result, 16);
}

/**
 * match_strcpy: - copies the characters from a substring_t to a string
 * @to: string to copy characters to.
 * @s: &substring_t to copy
 *
 * Description: Copies the set of characters represented by the given
 * &substring_t @s to the c-style string @to. Caller guarantees that @to is
 * large enough to hold the characters of @s.
 */
void match_strcpy(char *to, substring_t *s)
{
        memcpy(to, s->from, s->to - s->from);
        to[s->to - s->from] = '\0';
}

/**
 * match_strdup: - allocate a new string with the contents of a substring_t
 * @s: &substring_t to copy
 *
 * Description: Allocates and returns a string filled with the contents of
 * the &substring_t @s. The caller is responsible for freeing the returned
 * string with kfree().
 */
char *match_strdup(substring_t *s)
{
        char *p = kmalloc(s->to - s->from + 1, GFP_KERNEL);
        if (p)
                match_strcpy(p, s);
        return p;
}

EXPORT_SYMBOL(match_token);
EXPORT_SYMBOL(match_int);
EXPORT_SYMBOL(match_octal);
EXPORT_SYMBOL(match_hex);
EXPORT_SYMBOL(match_strcpy);
EXPORT_SYMBOL(match_strdup);