Function cbm_memmem

internal/cbm/helpers.c:33–48

Hand-rolled memmem: does not rely on the system memmem (GNU/BSD-only; msys2-clang on Windows lacks it), so it compiles identically everywhere.

// Hand-rolled memmem: does not rely on the system memmem (GNU/BSD-only;
// msys2-clang on Windows lacks it), so it compiles identically everywhere.
void *cbm_memmem(const void *haystack, size_t haystack_len, const void *needle, size_t needle_len) {
    if (needle_len == 0) {
        return (void *)haystack;
    }
    if (needle_len > haystack_len) {
        return NULL;
    }
    const char *h = (const char *)haystack;
    size_t last = haystack_len - needle_len;
    for (size_t i = 0; i <= last; i++) {
        if (memcmp(h + i, needle, needle_len) == 0) {
            return (void *)(h + i);
        }
    }
    return NULL;
}

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