// SPDX-License-Identifier: GPL-2.0-only
/*
 * From lib/cmdline.c
 */
#include <stdlib.h>

#if __has_attribute(__fallthrough__)
# define fallthrough                    __attribute__((__fallthrough__))
#else
# define fallthrough                    do {} while (0)  /* fallthrough */
#endif

unsigned long long memparse(const char *ptr, char **retptr)
{
        char *endptr;   /* local pointer to end of parsed string */

        unsigned long long ret = strtoll(ptr, &endptr, 0);

        switch (*endptr) {
        case 'E':
        case 'e':
                ret <<= 10;
                fallthrough;
        case 'P':
        case 'p':
                ret <<= 10;
                fallthrough;
        case 'T':
        case 't':
                ret <<= 10;
                fallthrough;
        case 'G':
        case 'g':
                ret <<= 10;
                fallthrough;
        case 'M':
        case 'm':
                ret <<= 10;
                fallthrough;
        case 'K':
        case 'k':
                ret <<= 10;
                endptr++;
                fallthrough;
        default:
                break;
        }

        if (retptr)
                *retptr = endptr;

        return ret;
}