source: MondoRescue/branches/2.2.5/mindi-busybox/libbb/xatonum_template.c@ 1765

/*
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 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.  Speed isn't critical here
     * since we're parsing commandline args.  So make sure we get the
     * actual isspace function rather than a lnumstrer 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 xstrtou(_range)(const char *numstr, int base,
        unsigned type lower,
        unsigned type upper)
{
    return xstrtou(_range_sfx)(numstr, base, lower, upper, NULL);
}

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

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

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

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

/* Signed ones */

type 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;

    if (p[0] == '-') {
        ++p;
        ++u;    /* two's complement */
    }

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

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

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

type 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