/* Id: dba_array.c,v 1.2 2020/06/22 19:20:40 schwarze Exp  */
/*
* Copyright (c) 2016 Ingo Schwarze <[email protected]>
*
* 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 "config.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');
}