/* Id: mandoc_xr.c,v 1.4 2020/06/22 19:20:40 schwarze Exp  */
/*
* Copyright (c) 2017 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.
*/
#include "config.h"

#include <sys/types.h>

#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "mandoc_aux.h"
#include "mandoc_ohash.h"
#include "mandoc_xr.h"

static struct ohash      *xr_hash = NULL;
static struct mandoc_xr  *xr_first = NULL;
static struct mandoc_xr  *xr_last = NULL;

static void               mandoc_xr_clear(void);


static void
mandoc_xr_clear(void)
{
       struct mandoc_xr        *xr;
       unsigned int             slot;

       if (xr_hash == NULL)
               return;
       for (xr = ohash_first(xr_hash, &slot); xr != NULL;
            xr = ohash_next(xr_hash, &slot))
               free(xr);
       ohash_delete(xr_hash);
}

void
mandoc_xr_reset(void)
{
       if (xr_hash == NULL)
               xr_hash = mandoc_malloc(sizeof(*xr_hash));
       else
               mandoc_xr_clear();
       mandoc_ohash_init(xr_hash, 5,
           offsetof(struct mandoc_xr, hashkey));
       xr_first = xr_last = NULL;
}

int
mandoc_xr_add(const char *sec, const char *name, int line, int pos)
{
       struct mandoc_xr         *xr, *oxr;
       const char               *pend;
       size_t                    ssz, nsz, tsz;
       unsigned int              slot;
       int                       ret;
       uint32_t                  hv;

       if (xr_hash == NULL)
               return 0;

       ssz = strlen(sec) + 1;
       nsz = strlen(name) + 1;
       tsz = ssz + nsz;
       xr = mandoc_malloc(sizeof(*xr) + tsz);
       xr->next = NULL;
       xr->sec = xr->hashkey;
       xr->name = xr->hashkey + ssz;
       xr->line = line;
       xr->pos = pos;
       xr->count = 1;
       memcpy(xr->sec, sec, ssz);
       memcpy(xr->name, name, nsz);

       pend = xr->hashkey + tsz;
       hv = ohash_interval(xr->hashkey, &pend);
       slot = ohash_lookup_memory(xr_hash, xr->hashkey, tsz, hv);
       if ((oxr = ohash_find(xr_hash, slot)) == NULL) {
               ohash_insert(xr_hash, slot, xr);
               if (xr_first == NULL)
                       xr_first = xr;
               else
                       xr_last->next = xr;
               xr_last = xr;
               return 0;
       }

       oxr->count++;
       ret = (oxr->line == -1) ^ (xr->line == -1);
       if (xr->line == -1)
               oxr->line = -1;
       free(xr);
       return ret;
}

struct mandoc_xr *
mandoc_xr_get(void)
{
       return xr_first;
}

void
mandoc_xr_free(void)
{
       mandoc_xr_clear();
       free(xr_hash);
       xr_hash = NULL;
}