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/* $OpenBSD: dba_array.c,v 1.1 2016/08/01 10:32:39 schwarze Exp $ */
/*
* Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Allocation-based arrays for the mandoc database, for read-write access.
* The interface is defined in "dba_array.h".
*/
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "mandoc_aux.h"
#include "dba_write.h"
#include "dba_array.h"
struct dba_array {
void **ep; /* Array of entries. */
int32_t *em; /* Array of map positions. */
int flags;
int32_t ea; /* Entries allocated. */
int32_t eu; /* Entries used (including deleted). */
int32_t ed; /* Entries deleted. */
int32_t ec; /* Currently active entry. */
int32_t pos; /* Map position of this array. */
};
struct dba_array *
dba_array_new(int32_t ea, int flags)
{
struct dba_array *array;
assert(ea > 0);
array = mandoc_malloc(sizeof(*array));
array->ep = mandoc_reallocarray(NULL, ea, sizeof(*array->ep));
array->em = mandoc_reallocarray(NULL, ea, sizeof(*array->em));
array->ea = ea;
array->eu = 0;
array->ed = 0;
array->ec = 0;
array->flags = flags;
array->pos = 0;
return array;
}
void
dba_array_free(struct dba_array *array)
{
int32_t ie;
if (array == NULL)
return;
if (array->flags & DBA_STR)
for (ie = 0; ie < array->eu; ie++)
free(array->ep[ie]);
free(array->ep);
free(array->em);
free(array);
}
void
dba_array_set(struct dba_array *array, int32_t ie, void *entry)
{
assert(ie >= 0);
assert(ie < array->ea);
assert(ie <= array->eu);
if (ie == array->eu)
array->eu++;
if (array->flags & DBA_STR)
entry = mandoc_strdup(entry);
array->ep[ie] = entry;
array->em[ie] = 0;
}
void
dba_array_add(struct dba_array *array, void *entry)
{
if (array->eu == array->ea) {
assert(array->flags & DBA_GROW);
array->ep = mandoc_reallocarray(array->ep,
2, sizeof(*array->ep) * array->ea);
array->em = mandoc_reallocarray(array->em,
2, sizeof(*array->em) * array->ea);
array->ea *= 2;
}
dba_array_set(array, array->eu, entry);
}
void *
dba_array_get(struct dba_array *array, int32_t ie)
{
if (ie < 0 || ie >= array->eu || array->em[ie] == -1)
return NULL;
return array->ep[ie];
}
void
dba_array_start(struct dba_array *array)
{
array->ec = array->eu;
}
void *
dba_array_next(struct dba_array *array)
{
if (array->ec < array->eu)
array->ec++;
else
array->ec = 0;
while (array->ec < array->eu && array->em[array->ec] == -1)
array->ec++;
return array->ec < array->eu ? array->ep[array->ec] : NULL;
}
void
dba_array_del(struct dba_array *array)
{
if (array->ec < array->eu && array->em[array->ec] != -1) {
array->em[array->ec] = -1;
array->ed++;
}
}
void
dba_array_undel(struct dba_array *array)
{
memset(array->em, 0, sizeof(*array->em) * array->eu);
}
void
dba_array_setpos(struct dba_array *array, int32_t ie, int32_t pos)
{
array->em[ie] = pos;
}
int32_t
dba_array_getpos(struct dba_array *array)
{
return array->pos;
}
void
dba_array_sort(struct dba_array *array, dba_compare_func func)
{
assert(array->ed == 0);
qsort(array->ep, array->eu, sizeof(*array->ep), func);
}
int32_t
dba_array_writelen(struct dba_array *array, int32_t nmemb)
{
dba_int_write(array->eu - array->ed);
return dba_skip(nmemb, array->eu - array->ed);
}
void
dba_array_writepos(struct dba_array *array)
{
int32_t ie;
array->pos = dba_tell();
for (ie = 0; ie < array->eu; ie++)
if (array->em[ie] != -1)
dba_int_write(array->em[ie]);
}
void
dba_array_writelst(struct dba_array *array)
{
const char *str;
dba_array_FOREACH(array, str)
dba_str_write(str);
dba_char_write('\0');
}
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