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/* Copyright (c) 2024, Peter McGoron
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include "uns.h"
#include "uns_string.h"
enum {
ALLEN_IND = 0,
LEN_IND = 1,
BYTES_IND = 2,
NUMBER_OF_IND = 3
};
static size_t get_size_t(struct uns_gc *gc, struct uns_root_list *root, size_t i)
{
size_t r;
void *p = gc->record_get_ptr(root->p, i);
memcpy(&r, p, sizeof(r));
return r;
}
static void set_size_t(struct uns_gc *gc, struct uns_root_list *root, size_t i, size_t val)
{
void *p = gc->record_get_ptr(root->p, i);
memcpy(p, &val, sizeof(val));
}
#define set_allen(gc,root,val) set_size_t(gc, root, ALLEN_IND, val)
#define set_len(gc,root,val) set_size_t(gc, root, LEN_IND, val)
static size_t uns_string_allen(struct uns_gc *gc, struct uns_root_list *root)
{
return get_size_t(gc, root, ALLEN_IND);
}
size_t uns_string_len(struct uns_gc *gc, struct uns_root_list *root)
{
return get_size_t(gc, root, LEN_IND);
}
char *uns_string_ptr(struct uns_gc *gc, struct uns_root_list *root)
{
return gc->record_get_ptr(root->p, BYTES_IND);
}
void uns_string_alloc(struct uns_gc *gc, struct uns_root_list *root, size_t start_len)
{
unsigned char *p;
root->p = gc->alloc_record(gc, NUMBER_OF_IND);
/* The following is incorrect:
* gc->record_set_ptr(root->p, ALLEN_IND, gc->alloc(gc, sizeof(size_t)));
* This is because gc->alloc() can cause a collection, invalidating root->p,
* but root->p may have already been put on the stack.
*/
p = gc->alloc(gc, sizeof(size_t));
gc->record_set_ptr(root->p, ALLEN_IND, p);
set_allen(gc, root, start_len);
p = gc->alloc(gc, sizeof(size_t));
gc->record_set_ptr(root->p, LEN_IND, p);
set_len(gc, root, 0);
p = gc->alloc(gc, start_len);
gc->record_set_ptr(root->p, BYTES_IND, p);
}
void uns_string_resize(struct uns_gc *gc, struct uns_root_list *root, size_t newlen)
{
struct uns_root_list tmp_new = {0};
size_t old_len = uns_string_len(gc, root);
uns_root_add(gc, &tmp_new);
uns_string_alloc(gc, &tmp_new, newlen);
if (newlen <= old_len)
set_len(gc, &tmp_new, newlen);
else
set_len(gc, &tmp_new, old_len);
memcpy(uns_string_ptr(gc, &tmp_new), uns_string_ptr(gc, root), uns_string_len(gc, root));
root->p = tmp_new.p;
uns_root_remove(gc, &tmp_new);
}
void uns_string_ensure(struct uns_gc *gc, struct uns_root_list *root, size_t extent)
{
size_t used = uns_string_len(gc, root);
size_t allen = uns_string_allen(gc, root);
if (used + extent > allen)
uns_string_resize(gc, root, used + extent);
}
void uns_string_append_bytes(struct uns_gc *gc, struct uns_root_list *to,
const void *from, size_t bytes)
{
size_t len = uns_string_len(gc, to);
uns_string_ensure(gc, to, bytes);
memcpy(uns_string_ptr(gc, to) + len, from, bytes);
set_len(gc, to, len + bytes);
}
void uns_string_append_char(struct uns_gc *gc, struct uns_root_list *root, char c)
{
uns_string_append_bytes(gc, root, &c, 1);
}
char *uns_string_cstring(struct uns_gc *gc, struct uns_root_list *root)
{
char *p;
uns_string_ensure(gc, root, 1);
p = uns_string_ptr(gc, root);
p[uns_string_len(gc, root)] = 0;
return p;
}
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