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#include <stdlib.h>
#include <string.h>
#include "../core/index.h"
#include "sequence.h"
/*
* Bypass rendundant ZoO_START_OF_SEQUENCE_ID at the start of a sequence.
*/
/* ensures (*sequence_offset <= sequence_length) */
static void bypass_redundant_sos
(
const ZoO_index sequence [const restrict],
const ZoO_index sequence_length,
ZoO_index sequence_offset [const restrict static 1]
)
{
ZoO_index i;
*sequence_offset = 0;
for (i = 0; i < sequence_length; ++i)
{
if (sequence[i] != ZoO_START_OF_SEQUENCE_ID)
{
return;
}
else if (sequence[i] == ZoO_START_OF_SEQUENCE_ID)
{
*sequence_offset = i;
}
}
}
/* See "sequence.h" */
int ZoO_sequence_cmp
(
const ZoO_index sequence_a [const],
ZoO_index sequence_a_length,
const ZoO_index sequence_b [const],
ZoO_index sequence_b_length
)
{
ZoO_index min_length, a, b;
ZoO_index a_offset, b_offset;
ZoO_index i;
bypass_redundant_sos(sequence_a, sequence_a_length, &a_offset);
bypass_redundant_sos(sequence_b, sequence_b_length, &b_offset);
/*@ requires (*a_offset <= sequence_a_length) @*/
sequence_a_length -= a_offset;
/*@ requires (*b_offset <= sequence_b_length) @*/
sequence_b_length -= b_offset;
if (sequence_a_length < sequence_b_length)
{
min_length = sequence_a_length;
}
else
{
min_length = sequence_b_length;
}
/*@ ensures (min_length <= sequence_a_length) @*/
/*@ ensures (min_length <= sequence_b_length) @*/
for (i = 0; i < min_length; ++i)
{
/*@ requires ((i + a_offset) < sequence_a_length) @*/
a = sequence_a[i + a_offset];
/*@ requires ((i + b_offset) < sequence_b_length) @*/
b = sequence_b[i + b_offset];
if (a < b)
{
return -1;
}
else if (b > a)
{
return 1;
}
else if ((a == ZoO_END_OF_SEQUENCE_ID) && (b == ZoO_END_OF_SEQUENCE_ID))
{
return 0;
}
}
if (sequence_a_length > sequence_b_length)
{
return 1;
}
else if (sequence_a_length < sequence_b_length)
{
return -1;
}
else
{
return 0;
}
}
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