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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h> /* defines SIZE_MAX */
#include "../core/index.h"
#include "../error/error.h"
#include "sequence.h"
/******************************************************************************/
/** MEMORY (RE)ALLOCATION *****************************************************/
/******************************************************************************/
/*@
requires \valid(required_capacity);
requires \valid(io);
requires
\separated
(
(required_capacity+ (0 .. \block_length(required_capacity))),
(io+ (0 .. \block_length(io)))
);
assigns \result;
assigns (*required_capacity);
ensures ((\result == 0) || (\result == -1));
ensures \valid(required_capacity);
ensures \valid(io);
ensures
\separated
(
(required_capacity+ (0 .. \block_length(required_capacity))),
(io+ (0 .. \block_length(io)))
);
ensures
(
(\result == 0) <==>
((*required_capacity) == (\old(*required_capacity) + 1))
);
ensures
(
(\result == 0) ==>
((*required_capacity) * sizeof(ZoO_index)) <= SIZE_MAX
);
ensures
(
(\result == -1) <==>
((*required_capacity) == \old(*required_capacity))
);
@*/
static int increment_required_capacity
(
size_t required_capacity [const restrict static 1],
FILE io [const restrict static 1]
)
{
if
(
(*required_capacity == SIZE_MAX)
|| ((SIZE_MAX / sizeof(ZoO_index)) <= (*required_capacity + 1))
)
{
/*@ assert \valid(io); @*/
#ifndef ZoO_RUNNING_FRAMA_C
ZoO_S_ERROR
(
io,
"Sequence capacity increment aborted, as the new size would not fit"
" in a size_t variable."
);
#endif
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,
FILE io [const restrict static 1]
)
{
ZoO_index * new_sequence;
/*@ assert \valid(sequence_capacity); @*/
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); @*/
#ifndef ZoO_RUNNING_FRAMA_C
ZoO_S_ERROR
(
io,
"Unable to reallocate memory to match sequence's required size."
);
#endif
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],
FILE 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
)
{
*sequence_length -= 1;
return -1;
}
/*@ assert (*sequence_length) >= 0; @*/
if ((*sequence_length) > 1)
{
/*@ assert(((*sequence_length) * sizeof(ZoO_index)) <= SIZE_MAX); @*/
#ifndef ZoO_RUNNING_FRAMA_C
memmove
(
(void *) ((*sequence) + 1),
(const void *) (*sequence),
(((*sequence_length) - 1) * sizeof(ZoO_index))
);
#endif
}
(*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],
FILE 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
)
{
*sequence_length -= 1;
return -1;
}
/*@ assert ((*sequence_length) >= 1); @*/
(*sequence)[(*sequence_length) - 1] = word_id;
/*@ assert ((*sequence_length) >= 1); @*/
return 0;
}
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