Differential D36860 Diff 111610 contrib/libdiff/test/test004.right.txt

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				int Chunk_bounds_check(Chunk *chunk, size_t start, size_t n)
				{
				if (chunk == NULL) return 0;

				return start <= chunk->length && n <= chunk->length - start;
				}

				void Chunk_copy(Chunk src, size_t src_start, Chunk dst, size_t dst_start, size_t n)
				{
				if (!Chunk_bounds_check(src, src_start, n)) return;
				if (!Chunk_bounds_check(dst, dst_start, n)) return;

				memcpy(dst->data + dst_start, src->data + src_start, n);
				}