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#include "utf8.h" size_t u8spn(const char8_t *s, size_t n, const rune *p, size_t m) { rune ch; size_t k = 0; while (u8next(&ch, &s, &n)) { for (size_t i = 0; i < m; i++) { if (p[i] == ch) { k++; goto found; } } break; found:; } return k; }