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Diffstat (limited to 'src/data/stack.c')
| -rw-r--r-- | src/data/stack.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/src/data/stack.c b/src/data/stack.c new file mode 100644 index 0000000..f0392d0 --- /dev/null +++ b/src/data/stack.c @@ -0,0 +1,234 @@ +/*:* + *: File: ./src/data/stack.c + *: A simple interpreter + *: + *: WWW : http://fype.buetow.org + *: E-Mail : fype@dev.buetow.org + *: + *: Copyright (c) 2005 2006 2007 2008, Paul Buetow (http://www.pblabs.net) + *: All rights reserved. + *: + *: Redistribution and use in source and binary forms, with or without modi- + *: fication, are permitted provided that the following conditions are met: + *: * Redistributions of source code must retain the above copyright + *: notice, this list of conditions and the following disclaimer. + *: * 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. + *: * Neither the name of P. B. Labs 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 Paul Buetow 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 Paul Buetow 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 "stack.h" + +#include "../defines.h" + +Stack* +stack_new() { + Stack *p_stack = (Stack *) malloc(sizeof(Stack)); + + p_stack->p_first = p_stack->p_last = NULL; + p_stack->i_size = 0; + + return (p_stack); +} + +StackElem* +stackelem_new() { + StackElem *p_elem = (StackElem *) malloc(sizeof(StackElem)); + + p_elem->p_next = NULL; + p_elem->p_val = NULL; + + return (p_elem); +} + +_Bool +stack_empty(Stack *p_stack) { + return (p_stack->i_size == 0); +} + +void +stack_push(Stack *p_stack, void *p_val) { + StackElem *p_elem = stackelem_new(); + + p_elem->p_val = p_val; + p_elem->p_next = p_stack->p_first; + p_stack->p_first = p_elem; + + if (p_stack->p_last == NULL) + p_stack->p_last = p_stack->p_first; + + ++p_stack->i_size; +} + +void* +stack_pop(Stack *p_stack) { + if (stack_empty(p_stack)) + return (NULL); + + StackElem *p_elem = p_stack->p_first; + p_stack->p_first = p_elem->p_next; + + void *p_val = p_elem->p_val; + free(p_elem); + --p_stack->i_size; + + if (p_stack->i_size == 0) + p_stack->p_last = NULL; + + return (p_val); +} + +void +stack_clear(Stack *p_stack) { + for (;!stack_empty(p_stack); stack_pop(p_stack)); +} + +void +stack_delete(Stack *p_stack) { + stack_clear(p_stack); + free(p_stack); +} + +void +stack_delete_and_free(Stack *p_stack) { + for (;!stack_empty(p_stack); free(stack_pop(p_stack))); + stack_delete(p_stack); +} + +unsigned +stack_size(Stack *p_stack) { + if (!p_stack) + return (0); + + return (p_stack->i_size); +} + +void +stack_merge(Stack *p_stack, Stack *p_stack_merge) { + if (stack_empty(p_stack_merge)) + return; + + if (stack_empty(p_stack)) { + p_stack->p_first = p_stack_merge->p_first; + p_stack->p_last = p_stack_merge->p_last; + p_stack->i_size = p_stack_merge->i_size; + + } else { + StackElem *p_old_first = p_stack->p_first; + + p_stack->p_first = p_stack_merge->p_first; + p_stack_merge->p_last->p_next = p_old_first; + p_stack->i_size += p_stack_merge->i_size; + } + + p_stack_merge->p_first = p_stack_merge->p_last = NULL; + p_stack_merge->i_size = 0; +} + +void +stack_concat(Stack *p_stack, Stack *p_stack_concat) { + if (stack_empty(p_stack_concat)) + return; + + Stack *p_stack_tmp = stack_new(); + + StackIterator *p_iter = stackiterator_new(p_stack_concat); + + while (stackiterator_has_next(p_iter)) + stack_push(p_stack_tmp, stackiterator_next(p_iter)); + + stackiterator_delete(p_iter); + + while (!stack_empty(p_stack_tmp)) + stack_push(p_stack, stack_pop(p_stack_tmp)); + + stack_delete(p_stack_tmp); +} + +void +stack_iterate(Stack *p_stack, void (*func)(void *p_void)) { + if (!p_stack) + return; + + StackElem *p_elem = p_stack->p_first; + + while (p_elem) { + (*func)(p_elem->p_val); + p_elem = p_elem->p_next; + } +} + +StackIterator* +stackiterator_new(Stack *p_stack) { + StackIterator *p_iter = malloc(sizeof(StackIterator)); + + p_iter->p_current = p_stack->p_first; + p_iter->p_prev = NULL; + + return (p_iter); +} + +void +stackiterator_delete(StackIterator *p_iter) { + free(p_iter); +} + +void* +stackiterator_next(StackIterator *p_iter) { + if (!p_iter) + return (NULL); + + StackElem *p_elem = p_iter->p_current; + + if (!p_elem) + return (NULL); + + p_iter->p_prev = p_iter->p_current; + p_iter->p_current = p_elem->p_next; + + return (p_elem->p_val); +} + +_Bool +stackiterator_has_next(StackIterator *p_iter) { + return (p_iter->p_current ? true : false); +} + +_Bool +stackiterator_remove_prev(StackIterator *p_iter) { + StackElem *p_prev = p_iter->p_prev; + + if (p_prev == NULL) + return (false); + + StackElem *p_next = p_prev->p_next; + + if (p_next == NULL) + return (false); + + p_prev->p_val = p_next->p_val; + p_prev->p_next = p_next->p_next; + + + free(p_next); + + p_iter->p_current = p_prev; + p_iter->p_prev = NULL; + + return (true); +} |