// string.h
// limits.h

int SearchString(const char *text, const char *pattern)
{
    int m = strlen(pattern);
    unsigned long R;
    unsigned long patternMask[CHAR_MAX + 1];
    int i;

    if (pattern[0] == '\0') return 0;
    if (m > 31) return -1; //Error: The pattern is too long!

    R = ~1;

    for (i = 0; i <= CHAR_MAX; ++i)
        patternMask[i] = ~0;

    for (i = 0; i < m; ++i)
        patternMask[pattern[i]] &= ~(1UL << i);

    for (i = 0; text[i] != '\0'; ++i)
    {
        R |= patternMask[text[i]];
        R <<= 1;

        if (0 == (R & (1UL << m)))
            return (i - m) + 1;
    }

    return -1;
}