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/**************************************************************************
*
* Copyright 2010 Luca Barbieri
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef U_DYNARRAY_H
#define U_DYNARRAY_H
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "ralloc.h"
#ifdef __cplusplus
extern "C" {
#endif
/* A zero-initialized version of this is guaranteed to represent an
* empty array.
*
* Also, size <= capacity and data != 0 if and only if capacity != 0
* capacity will always be the allocation size of data
*/
struct util_dynarray
{
void *mem_ctx;
void *data;
unsigned size;
unsigned capacity;
};
static inline void
util_dynarray_init(struct util_dynarray *buf, void *mem_ctx)
{
memset(buf, 0, sizeof(*buf));
buf->mem_ctx = mem_ctx;
}
static inline void
util_dynarray_fini(struct util_dynarray *buf)
{
if (buf->data) {
if (buf->mem_ctx) {
ralloc_free(buf->data);
} else {
free(buf->data);
}
util_dynarray_init(buf, buf->mem_ctx);
}
}
static inline void
util_dynarray_clear(struct util_dynarray *buf)
{
buf->size = 0;
}
#define DYN_ARRAY_INITIAL_SIZE 64
MUST_CHECK static inline void *
util_dynarray_ensure_cap(struct util_dynarray *buf, unsigned newcap)
{
if (newcap > buf->capacity) {
unsigned capacity = MAX3(DYN_ARRAY_INITIAL_SIZE, buf->capacity * 2, newcap);
void *data;
if (buf->mem_ctx) {
data = reralloc_size(buf->mem_ctx, buf->data, capacity);
} else {
data = realloc(buf->data, capacity);
}
if (!data)
return 0;
buf->data = data;
buf->capacity = capacity;
}
return (void *)((char *)buf->data + buf->size);
}
/* use util_dynarray_trim to reduce the allocated storage */
MUST_CHECK static inline void *
util_dynarray_resize_bytes(struct util_dynarray *buf, unsigned nelts, size_t eltsize)
{
if (unlikely(nelts > UINT_MAX / eltsize))
return 0;
unsigned newsize = nelts * eltsize;
void *p = util_dynarray_ensure_cap(buf, newsize);
if (!p)
return 0;
buf->size = newsize;
return p;
}
static inline void
util_dynarray_clone(struct util_dynarray *buf, void *mem_ctx,
struct util_dynarray *from_buf)
{
util_dynarray_init(buf, mem_ctx);
if (util_dynarray_resize_bytes(buf, from_buf->size, 1))
memcpy(buf->data, from_buf->data, from_buf->size);
}
MUST_CHECK static inline void *
util_dynarray_grow_bytes(struct util_dynarray *buf, unsigned ngrow, size_t eltsize)
{
unsigned growbytes = ngrow * eltsize;
if (unlikely(ngrow > (UINT_MAX / eltsize) ||
growbytes > UINT_MAX - buf->size))
return 0;
unsigned newsize = buf->size + growbytes;
void *p = util_dynarray_ensure_cap(buf, newsize);
if (!p)
return 0;
buf->size = newsize;
return p;
}
static inline void
util_dynarray_trim(struct util_dynarray *buf)
{
if (buf->size != buf->capacity) {
if (buf->size) {
if (buf->mem_ctx) {
buf->data = reralloc_size(buf->mem_ctx, buf->data, buf->size);
} else {
buf->data = realloc(buf->data, buf->size);
}
buf->capacity = buf->size;
} else {
if (buf->mem_ctx) {
ralloc_free(buf->data);
} else {
free(buf->data);
}
buf->data = NULL;
buf->capacity = 0;
}
}
}
#define util_dynarray_append(buf, type, v) do {type __v = (v); memcpy(util_dynarray_grow_bytes((buf), 1, sizeof(type)), &__v, sizeof(type));} while(0)
/* Returns a pointer to the space of the first new element (in case of growth) or NULL on failure. */
#define util_dynarray_resize(buf, type, nelts) util_dynarray_resize_bytes(buf, (nelts), sizeof(type))
#define util_dynarray_grow(buf, type, ngrow) util_dynarray_grow_bytes(buf, (ngrow), sizeof(type))
#define util_dynarray_top_ptr(buf, type) (type*)((char*)(buf)->data + (buf)->size - sizeof(type))
#define util_dynarray_top(buf, type) *util_dynarray_top_ptr(buf, type)
#define util_dynarray_pop_ptr(buf, type) (type*)((char*)(buf)->data + ((buf)->size -= sizeof(type)))
#define util_dynarray_pop(buf, type) *util_dynarray_pop_ptr(buf, type)
#define util_dynarray_contains(buf, type) ((buf)->size >= sizeof(type))
#define util_dynarray_element(buf, type, idx) ((type*)(buf)->data + (idx))
#define util_dynarray_begin(buf) ((buf)->data)
#define util_dynarray_end(buf) ((void*)util_dynarray_element((buf), char, (buf)->size))
#define util_dynarray_num_elements(buf, type) ((buf)->size / sizeof(type))
#define util_dynarray_foreach(buf, type, elem) \
for (type *elem = (type *)(buf)->data; \
elem < (type *)((char *)(buf)->data + (buf)->size); elem++)
#define util_dynarray_foreach_reverse(buf, type, elem) \
if ((buf)->size > 0) \
for (type *elem = util_dynarray_top_ptr(buf, type); \
elem; \
elem = elem > (type *)(buf)->data ? elem - 1 : NULL)
#define util_dynarray_delete_unordered(buf, type, v) \
do { \
unsigned num_elements = (buf)->size / sizeof(type); \
unsigned i; \
for (i = 0; i < num_elements; i++) { \
type __v = *util_dynarray_element((buf), type, (i)); \
if (v == __v) { \
memcpy(util_dynarray_element((buf), type, (i)), \
util_dynarray_pop_ptr((buf), type), sizeof(type)); \
break; \
} \
} \
} while (0)
#ifdef __cplusplus
}
#endif
#endif /* U_DYNARRAY_H */
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