diff options
Diffstat (limited to 'include/array.h')
| -rw-r--r-- | include/array.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/include/array.h b/include/array.h new file mode 100644 index 0000000..de45a65 --- /dev/null +++ b/include/array.h @@ -0,0 +1,63 @@ +#ifndef MLIB_ARRAY_H +#define MLIB_ARRAY_H + +#include <stddef.h> +#include <string.h> + +#include "_allocator.h" +#include "_attrs.h" + +typedef struct { + ptrdiff_t len, cap; + allocator_t mem; +} _mlib_arr_hdr_t; + +[[_mlib_inline]] +static inline _mlib_arr_hdr_t * +_mlib_array_hdr(void *p, ptrdiff_t align) +{ + ptrdiff_t pad = -sizeof(_mlib_arr_hdr_t) & (align - 1); + return (_mlib_arr_hdr_t *)((char *)p - pad - sizeof(_mlib_arr_hdr_t)); +} + +#define array_hdr(p) (_mlib_array_hdr(p, alignof(typeof(*(p))))) +#define array_len(p) (_mlib_array_hdr(p, alignof(typeof(*(p))))->len) +#define array_cap(p) (_mlib_array_hdr(p, alignof(typeof(*(p))))->cap) + +#define array_new(mem, T, n) \ + ((T *)array_new((mem), (n), sizeof(T), alignof(T))) +#define array_resz(p, cap) \ + ((typeof(p))array_resz((p), (cap), sizeof(*(p)), alignof(typeof(*(p))))) +#define array_free(p) \ + array_free((p), sizeof(*(p)), alignof(typeof(*(p)))) + +#define array_push(p, x) \ + do { \ + _mlib_arr_hdr_t *hdr = _mlib_array_hdr(*(p), alignof(typeof(**(p)))); \ + if (hdr->len == hdr->cap) { \ + *(p) = array_resz(*(p), hdr->len * 2); \ + hdr = _mlib_array_hdr(*(p), alignof(typeof(**(p)))); \ + } \ + (*(p))[hdr->len++] = (x); \ + } while (false) + +/* TODO: Make the resizing not bad */ +#define array_extend(p, xs, n) \ + do { \ + _mlib_arr_hdr_t *hdr = _mlib_array_hdr((p), alignof(typeof(*(p)))); \ + if (hdr->len + (n) <= hdr->cap) { \ + (p) = array_resz((p), hdr->len * 2 + (n)); \ + hdr = _mlib_array_hdr((p), alignof(typeof(*(p)))); \ + } \ + memcpy(&(p)[hdr->len], (xs), (n) * sizeof(*xs)); \ + hdr->len += (n); \ + } while (false) + +#define array_foreach(p, i) for (typeof(p) i = (p); i < (p) + array_len(p); i++) + +void *(array_new)(allocator_t mem, ptrdiff_t nmemb, ptrdiff_t elemsz, + ptrdiff_t align); +void *(array_resz)(void *ptr, ptrdiff_t ncap, ptrdiff_t elemsz, ptrdiff_t align); +void (array_free)(void *ptr, ptrdiff_t elemsz, ptrdiff_t align); + +#endif /* !MLIB_ARRAY_H */ |