/*
 *
 * Licensed under GPLv2, see file LICENSE in this tarball for details.
 */
/*
You need to define the following (example):

#define type long
#define xstrtou(rest) xstrtoul##rest
#define xstrto(rest) xstrtol##rest
#define xatou(rest) xatoul##rest
#define xato(rest) xatol##rest
#define XSTR_UTYPE_MAX ULONG_MAX
#define XSTR_TYPE_MAX LONG_MAX
#define XSTR_TYPE_MIN LONG_MIN
#define XSTR_STRTOU strtoul
*/

unsigned type FAST_FUNC xstrtou(_range_sfx)(const char *numstr, int base,
                unsigned type lower,
                unsigned type upper,
                const struct suffix_mult *suffixes)
{
        unsigned type r;
        int old_errno;
        char *e;

        /* Disallow '-' and any leading whitespace. Make sure we get the
         * actual isspace function rather than a macro implementaion. */
        if (*numstr == '-' || *numstr == '+' || (isspace)(*numstr))
                goto inval;

        /* Since this is a lib function, we're not allowed to reset errno to 0.
         * Doing so could break an app that is deferring checking of errno.
         * So, save the old value so that we can restore it if successful. */
        old_errno = errno;
        errno = 0;
        r = XSTR_STRTOU(numstr, &e, base);
        /* Do the initial validity check.  Note: The standards do not
         * guarantee that errno is set if no digits were found.  So we
         * must test for this explicitly. */
        if (errno || numstr == e)
                goto inval; /* error / no digits / illegal trailing chars */

        errno = old_errno;      /* Ok.  So restore errno. */

        /* Do optional suffix parsing.  Allow 'empty' suffix tables.
         * Note that we also allow nul suffixes with associated multipliers,
         * to allow for scaling of the numstr by some default multiplier. */
        if (suffixes) {
                while (suffixes->mult) {
                        if (strcmp(suffixes->suffix, e) == 0) {
                                if (XSTR_UTYPE_MAX / suffixes->mult < r)
                                        goto range; /* overflow! */
                                r *= suffixes->mult;
                                goto chk_range;
                        }
                        ++suffixes;
                }
        }

        /* Note: trailing space is an error.
           It would be easy enough to allow though if desired. */
        if (*e)
                goto inval;
 chk_range:
        /* Finally, check for range limits. */
        if (r >= lower && r <= upper)
                return r;
 range:
        bb_error_msg_and_die("number %s is not in %llu..%llu range",
                numstr, (unsigned long long)lower,
                (unsigned long long)upper);
 inval:
        bb_error_msg_and_die("invalid number '%s'", numstr);
}

unsigned type FAST_FUNC xstrtou(_range)(const char *numstr, int base,
                unsigned type lower,
                unsigned type upper)
{
        return xstrtou(_range_sfx)(numstr, base, lower, upper, NULL);
}

unsigned type FAST_FUNC xstrtou(_sfx)(const char *numstr, int base,
                const struct suffix_mult *suffixes)
{
        return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, suffixes);
}

unsigned type FAST_FUNC xstrtou()(const char *numstr, int base)
{
        return xstrtou(_range_sfx)(numstr, base, 0, XSTR_UTYPE_MAX, NULL);
}

unsigned type FAST_FUNC xatou(_range_sfx)(const char *numstr,
                unsigned type lower,
                unsigned type upper,
                const struct suffix_mult *suffixes)
{
        return xstrtou(_range_sfx)(numstr, 10, lower, upper, suffixes);
}

unsigned type FAST_FUNC xatou(_range)(const char *numstr,
                unsigned type lower,
                unsigned type upper)
{
        return xstrtou(_range_sfx)(numstr, 10, lower, upper, NULL);
}

unsigned type FAST_FUNC xatou(_sfx)(const char *numstr,
                const struct suffix_mult *suffixes)
{
        return xstrtou(_range_sfx)(numstr, 10, 0, XSTR_UTYPE_MAX, suffixes);
}

unsigned type FAST_FUNC xatou()(const char *numstr)
{
        return xatou(_sfx)(numstr, NULL);
}

/* Signed ones */

type FAST_FUNC xstrto(_range_sfx)(const char *numstr, int base,
                type lower,
                type upper,
                const struct suffix_mult *suffixes)
{
        unsigned type u = XSTR_TYPE_MAX;
        type r;
        const char *p = numstr;

        /* NB: if you'll decide to disallow '+':
         * at least renice applet needs to allow it */
        if (p[0] == '+' || p[0] == '-') {
                ++p;
                if (p[0] == '-')
                        ++u; /* = <type>_MIN (01111... + 1 == 10000...) */
        }

        r = xstrtou(_range_sfx)(p, base, 0, u, suffixes);

        if (*numstr == '-') {
                r = -r;
        }

        if (r < lower || r > upper) {
                bb_error_msg_and_die("number %s is not in %lld..%lld range",
                                numstr, (long long)lower, (long long)upper);
        }

        return r;
}

type FAST_FUNC xstrto(_range)(const char *numstr, int base, type lower, type upper)
{
        return xstrto(_range_sfx)(numstr, base, lower, upper, NULL);
}

type FAST_FUNC xato(_range_sfx)(const char *numstr,
                type lower,
                type upper,
                const struct suffix_mult *suffixes)
{
        return xstrto(_range_sfx)(numstr, 10, lower, upper, suffixes);
}

type FAST_FUNC xato(_range)(const char *numstr, type lower, type upper)
{
        return xstrto(_range_sfx)(numstr, 10, lower, upper, NULL);
}

type FAST_FUNC xato(_sfx)(const char *numstr, const struct suffix_mult *suffixes)
{
        return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, suffixes);
}

type FAST_FUNC xato()(const char *numstr)
{
        return xstrto(_range_sfx)(numstr, 10, XSTR_TYPE_MIN, XSTR_TYPE_MAX, NULL);
}

#undef type
#undef xstrtou
#undef xstrto
#undef xatou
#undef xato
#undef XSTR_UTYPE_MAX
#undef XSTR_TYPE_MAX
#undef XSTR_TYPE_MIN
#undef XSTR_STRTOU