Function stringcontains

numexpr3/string_functions.hpp:474–515

}

int
stringcontains(const char *haystack_start, const char *needle_start,  npy_intp max_haystack_len, npy_intp max_needle_len)
{
    // contains(str1, str2) function for string columns.
    // Based on Newlib/strstr.c.      
    // needle_len - Length of needle.
    // haystack_len - Known minimum length of haystack.
    size_t needle_len = min((size_t)max_needle_len, strlen(needle_start));
    size_t haystack_len = min((size_t)max_haystack_len, strlen(haystack_start));

    const char *haystack = haystack_start;
    const char *needle = needle_start;
    bool ok = true; /* needle is prefix of haystack. */

    if(haystack_len<needle_len)
        return 0;

    size_t si = 0;
    while (*haystack && *needle && si < needle_len)
    {
      ok &= *haystack++ == *needle++;
      si++;
    }
    if (ok)
    {
      return 1;
    }

    if (needle_len < LONG_NEEDLE_THRESHOLD)
    {
        char *res = two_way_short_needle ((const unsigned char *) haystack_start,
                                     haystack_len,
                                     (const unsigned char *) needle_start, needle_len) ;
        int ptrcomp = res != NULL;
        return ptrcomp;
    }

    char* res = two_way_long_needle ((const unsigned char *) haystack, haystack_len,
                              (const unsigned char *) needle, needle_len);
    int ptrcomp2 = res != NULL ? 1 : 0;
    return ptrcomp2;
}