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fixing off by one error in quicksort

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Alex Shinn 2010-07-31 23:00:37 +09:00
parent f58670b531
commit 566fdee273
1 changed files with 5 additions and 4 deletions
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9
lib/srfi/95/qsort.c
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@ -112,6 +112,7 @@ static sexp sexp_object_compare_op (sexp ctx sexp_api_params(self, n), sexp a, s
return sexp_make_fixnum(sexp_object_compare(ctx, a, b)); return sexp_make_fixnum(sexp_object_compare(ctx, a, b));
} }
/* fast path when using general object-cmp comparator with no key */
static void sexp_qsort (sexp ctx, sexp *vec, sexp_sint_t lo, sexp_sint_t hi) { static void sexp_qsort (sexp ctx, sexp *vec, sexp_sint_t lo, sexp_sint_t hi) {
sexp_sint_t mid, i, j; sexp_sint_t mid, i, j;
sexp tmp, tmp2; sexp tmp, tmp2;
@ -125,8 +126,8 @@ static void sexp_qsort (sexp ctx, sexp *vec, sexp_sint_t lo, sexp_sint_t hi) {
swap(tmp, vec[j], vec[hi]); swap(tmp, vec[j], vec[hi]);
if ((hi-lo) > 2) { if ((hi-lo) > 2) {
sexp_qsort(ctx, vec, lo, j-1); sexp_qsort(ctx, vec, lo, j-1);
lo = j+1; lo = j;
goto loop; goto loop; /* tail recurse on right side */
} }
} }
} }
@ -172,8 +173,8 @@ static sexp sexp_qsort_less (sexp ctx, sexp *vec,
res = sexp_qsort_less(ctx, vec, lo, j-1, less, key); res = sexp_qsort_less(ctx, vec, lo, j-1, less, key);
if (sexp_exceptionp(res)) if (sexp_exceptionp(res))
goto done; goto done;
lo = j+1; lo = j;
goto loop; goto loop; /* tail recurse on right side */
} }
} }
done: done: