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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h> /* defines SIZE_MAX */
#include "../core/index.h"
#include "../pipe/pipe.h"
#include "sequence.h"
/******************************************************************************/
/** MEMORY (RE)ALLOCATION *****************************************************/
/******************************************************************************/
/*@
requires \valid(required_capacity);
requires \valid(io);
requires (*required_capacity >= 0);
requires (*required_capacity <= SIZE_MAX);
requires \separated(required_capacity, io);
assigns \result;
ensures (*required_capacity >= 0);
behavior success:
assigns (*required_capacity);
ensures (\result >= 0);
ensures ((*required_capacity) == (\old(*required_capacity) + 1));
ensures (((*required_capacity) * sizeof(ZoO_index)) <= SIZE_MAX);
behavior failure:
assigns \nothing;
ensures (\result < 0);
complete behaviors;
disjoint behaviors;
@*/
static int increment_required_capacity
(
size_t required_capacity [const restrict static 1],
const struct ZoO_pipe io [const restrict static 1]
)
{
if
(
(*required_capacity == SIZE_MAX)
|| ((SIZE_MAX / sizeof(ZoO_index)) <= (*required_capacity + 1))
)
{
/*@ assert \valid(io); @*/
/*@ ghost return -1; @*/
ZoO_S_ERROR
(
io,
"Sequence capacity increment aborted, as the new size would not fit"
" in a size_t variable."
);
return -1;
}
/*@ assert ((*required_capacity) < SIZE_MAX); @*/
/*@ assert \valid(required_capacity); @*/
*required_capacity = (*required_capacity + 1);
/* assert (((*required_capacity) * sizeof(ZoO_index)) <= SIZE_MAX); @*/
return 0;
}
/******************************************************************************/
/** EXPORTED ******************************************************************/
/******************************************************************************/
int ZoO_sequence_ensure_capacity
(
ZoO_index * sequence [const restrict static 1],
size_t sequence_capacity [const restrict static 1],
const size_t sequence_required_capacity,
const struct ZoO_pipe io [const restrict static 1]
)
{
ZoO_index * new_sequence;
if (sequence_required_capacity <= *sequence_capacity)
{
return 0;
}
/*@
assert
(
sequence_required_capacity
<= (SIZE_MAX / sizeof(ZoO_index))
);
@*/
/*@ assert \valid(sequence); @*/
/*@ assert \valid(*sequence); @*/
new_sequence =
(ZoO_index *) realloc
(
(void *) *sequence,
(sequence_required_capacity * sizeof(ZoO_index))
);
if (new_sequence == (ZoO_index *) NULL)
{
/*@ assert \valid(io); @*/
/*@ ghost return -1; @*/
ZoO_S_ERROR
(
io,
"Unable to reallocate memory to match sequence's required size."
);
return -1;
}
*sequence_capacity = sequence_required_capacity;
*sequence = new_sequence;
return 1;
}
int ZoO_sequence_append_left
(
const ZoO_index word_id,
ZoO_index * sequence [const restrict static 1],
size_t sequence_capacity [const restrict static 1],
size_t sequence_length [const restrict static 1],
const struct ZoO_pipe io [const restrict static 1]
)
{
if (increment_required_capacity(sequence_length, io) < 0)
{
return -1;
}
/*@ assert (((*sequence_length) * sizeof(ZoO_index)) <= SIZE_MAX); @*/
if
(
/* Appears to make Frama-C forget everything about *sequence_length. */
ZoO_sequence_ensure_capacity
(
sequence,
sequence_capacity,
*sequence_length,
io
) < 0
)
{
return -2;
}
/*@ assert *sequence_length >= 0; @*/
if (*sequence_length > 1)
{
/*@ assert(((*sequence_length) * sizeof(ZoO_index)) <= SIZE_MAX); @*/
memmove
(
(void *) (*sequence + 1),
(const void *) sequence,
(((*sequence_length) - 1) * sizeof(ZoO_index))
);
}
(*sequence)[0] = word_id;
return 0;
}
int ZoO_sequence_append_right
(
ZoO_index * sequence [const restrict static 1],
const ZoO_index word_id,
size_t sequence_capacity [const restrict static 1],
size_t sequence_length [const restrict static 1],
const struct ZoO_pipe io [const restrict static 1]
)
{
if (increment_required_capacity(sequence_length, io) < 0)
{
return -1;
}
/*@ assert ((*sequence_length * sizeof(ZoO_index)) < SIZE_MAX); @*/
if
(
ZoO_sequence_ensure_capacity
(
sequence,
sequence_capacity,
*sequence_length,
io
) < 0
)
{
return -1;
}
/* assert (*sequence_length >= 1) */
(*sequence)[*sequence_length - 1] = word_id;
return 0;
}
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