[BUG] bsplitstr / bsplitstrcb issue with multicharacter delimiter

[createyourpersonalaccount]

Consider the following code that illustrates the issue:

#include <stdio.h>
#include <stdlib.h>
#include <bstrlib.h>

int main(void) {
  int i;
  bstring haystack = bfromcstr("aXXXXb");
  bstring needle = bfromcstr("XX");
  struct bstrList *xs = bsplitstr(haystack, needle);
  printf("Number of elements: %d\n", xs->qty);
  for(i = 0; i < xs->qty; i++) {
    printf("#%d: %s\n", i, xs->entry[i]->data);
  }
  bstrListDestroy(xs);
  bdestroy(haystack);
  bdestroy(needle);
  return 0;
}

The output is:

Number of elements: 2
#0: a
#1: XXb

This bug was pointed out by Claude Opus 4.8. The conversation is attached.

claude.md

[createyourpersonalaccount]

I note that this fork of the library https://github.com/msteinert/bstring has fixed this bug.