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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <os/np.h>
#include <np/piir.h>
#include <lib/ptrbox.h>
#include <string.h>
/*
* Allocate a new stack
*/
int
piir_stack_new(struct np_work *work, struct piir_stack **resp)
{
struct piir_stack *stack;
if (work == NULL || resp == NULL) {
return -EINVAL;
}
stack = ptrbox_alloc(sizeof(*stack), work->work_mem);
if (stack == NULL) {
return -ENOMEM;
}
memset(stack, 0, sizeof(*stack));
*resp = stack;
return 0;
}
/*
* Push to the PIIR stack
*/
int
piir_push(struct piir_stack *stack, ir_byte_t byte)
{
if (stack == NULL) {
return -EINVAL;
}
if (stack->op_i >= PIIR_STACK_SIZE - 1) {
return -1;
}
spinlock_acquire(&stack->lock);
stack->opstore[stack->op_i++] = byte;
spinlock_release(&stack->lock);
return 0;
}
/*
* Pop from the PIIR stack
*/
int
piir_pop(struct piir_stack *stack)
{
ir_byte_t byte;
if (stack == NULL) {
return -EINVAL;
}
if (stack->op_i == 0) {
return -1;
}
spinlock_acquire(&stack->lock);
byte = stack->opstore[--stack->op_i];
spinlock_release(&stack->lock);
return byte;
}
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