?? stack.c
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/** * stack.c -- Implementation of stack that can store anything. * Create: Xie Han, net lab of Peking University <e@pku.edu.cn> * * Simple is the best! * * Created: Sep 30 1:10am 2003. version 1.0.0 * Last updated: Apr 6 9:05pm 2005. version 2.2.1 */#include <stdlib.h>#include "stack.h"stack_t *stack_create(unsigned int init_size){ stack_t *stack = (stack_t *)malloc(sizeof (stack_t)); if (stack) { if (stack->base = (char *)malloc(init_size)) { stack->top = stack->base; stack->end = stack->base + init_size; } else { free(stack); stack = NULL; } } return stack;}int __stack_expand(unsigned int elem_size, stack_t *stack){ unsigned int new_size = stack->end - stack->base; char *new_base; if (new_size > 0) new_size <<= 1; else new_size = STACK_INITIAL_SIZE; while (stack->top + elem_size > stack->base + new_size) new_size <<= 1; if (new_base = (char *)realloc(stack->base, new_size)) { stack->top = stack->top - stack->base + new_base; stack->base = new_base; stack->end = stack->base + new_size; return new_size; } return -1;}void stack_destroy(stack_t *stack){ free(stack->base); free(stack);}
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