Precisei fazer uma biblioteca de manipulação de pilhas em C, então estou compartilhando (GPL) ela. Ela manipula pilhas (aqui chega a 32768) de todos os tipos (é só modificar um typedef). Ela usa comentários estilo doxygen.

Stack_id minha_pilha = stack_new();
a = stack_pop(minha_pilha);

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//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; either version 2 of the License, or
//      (at your option) any later version.
//      
//      This program is distributed in the hope that it will be useful,
//      but WITHOUT ANY WARRANTY; without even the implied warranty of
//      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//      GNU General Public License for more details.
//      
//      You should have received a copy of the GNU General Public License
//      along with this program; if not, write to the Free Software
//      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
//      MA 02110-1301, USA.

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>

#include "vinipsmaker_stacks.h"


/**
 *@file pilhas.c
 *@brief A static library to manipulate stacks
 *
 *@details It can manipulate up to SHRT_MAX + 1 stacks.
 *\n
 *@code
 * #include <stdio.h>
 * #include <limits.h>
 *
 * int main(){
 *  printf("You can use up to %u stacks\n",SHRT_MAX + 1);
 * }
 * @endcode
 * Each stack can store up to UINT_MAX plates.
 *@code
 * #include <stdio.h>
 * #include <limits.h>
 *
 * int main(){
 *  printf("Each stack that you use can store up to %u plates\n",UINT_MAX);
 * @endcode
 * Some examples\n
 * 32-bit \> 32,768 stacks with 4,294,967,295 plates
 *
 *@author 2009 Vinícius dos Santos Oliveira
 *
 *@todo Encontrar se o número de pilhas esgotou
 * antes de tentar criar uma nova pilha.
 *
 */


static unsigned short int number_of_stacks = 0;
static struct {
 Plate_t * stack;
 Stack_size_t size;
 Stack_id id;
} * stacks = NULL,aux,* err;


/**
 *@addtogroup pilhas
 *@{
 */

inline Stack_id stack_get_index(Stack_id id){
 register int i;
 if(id<0)
  return -1;
 for(i=0;i<number_of_stacks;++i){
  if(id == stacks[i].id){
   return i;
  }
 }
 return -1;
}

/**
 *@fn unsigned short int stacks_see_number
 *@code
 * printf("There are %hu stacks now\n",stacks_see_number());
 * @endcode
 *
 *@return It returns the number os stacks in the memory.
 *
 */
unsigned short int stacks_see_number( void ){
/**
 *@{
 */
 return number_of_stacks;
/**
 *@}
 */
}

/**
 *@fn Stack_id stack_new
 *@brief It create a stack
 *
 *@details Example of use
 *@code
 * Stack_id my_stack = stack_new();
 * if(my_stack < 0){
 *  fprintf(stderr,"Failure on stack creating\n");
 * }
 * @endcode
 *
 *@return It returns -1 if no stack was created
 * or the stack id if a stack was created.
 *
 *@see Stack_id
 *
 */
Stack_id stack_new( void ){
/**
 *@{
 */
 err = stacks;
 stacks = realloc(stacks,sizeof(aux)*(++number_of_stacks));
 if(stacks == NULL){
  stacks = err;
  --number_of_stacks;
  return -1;
 }
 stacks[number_of_stacks-1].stack = NULL;
 stacks[number_of_stacks-1].size = 0;
 stacks[number_of_stacks-1].id = -1;
 {
  register int i,j,num=0;
  register Bool_t nfound = TRUE;
  for(i=0;nfound;num=0){
   for(j=0;j<number_of_stacks;++j){
    if(i == stacks[j].id){
     ++i;
    }else{
     ++num;
    }
   }
   if(num == number_of_stacks)
    nfound = FALSE;
  }
  stacks[number_of_stacks-1].id = i;
 }
 return stacks[number_of_stacks-1].id;
/**
 *@}
 */
}

/**
 *@fn Bool_t stack_exist
 *
 *@details Example of use
 *@code
 * if(!stack_exist(my_stack)){
 *  my_stack = -1;
 *  printf("Stack already was destroyed\n");
 * }else{
 *  printf("Stack still exist\n");
 * }
 * @endcode
 *
 *@return It returns TRUE if the stack exist
 * and FALSE if the stack don't exist.
 *
 */
Bool_t stack_exist(Stack_id stack){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1)
  return FALSE;
 else
  return TRUE;
/**
 *@}
 */
}

/**
 *@fn Bool_t stack_is_empty
 *
 *@details Example of use
 *@code
 * if(stack_is_empty(my_stack)){
 *  printf("Stack is empty or not exist\n");
 * }
 * @endcode
 *
 *@warning You don't must use this function
 * with invalid stack indexs to discovery
 * if the stack exist. You must use stack_exist
 * instead or you'll get a warning on stderr.
 *
 */
Bool_t stack_is_empty(Stack_id stack){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1){
  fprintf(stderr,"\nStack not exist: %hi\n",stack);
  return TRUE;
 }
 if(stacks[index].size){
  return FALSE;
 }else{
  return TRUE;
 }
/**
 *@}
 */
}

/**
 *@fn SStack_size_t stack_size
 *@return It returns the stack size or
 * -1 if the stack don't exist.
 *
 *@see SStack_size_t
 *
 */
SStack_size_t stack_size(Stack_id stack){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1){
  return -1;
 }
 return stacks[index].size;
/**
 *@}
 */
}

/**
 *@fn Bool_t stack_push
 *@brief Add a element to stack.
 *
 *@details You can use this function to
 * put a \p plate on the \p stack. \n
 * Example
 *\n
 *@code
 * Plate_t my_plate;
 * if(stack_push(my_stack,my_plate)){
 *  printf("A new plate was added to the stack\n");
 * }
 * @endcode
 *
 *@return It returns TRUE on success and
 * FALSE on failure.
 *
 */
Bool_t stack_push(Stack_id stack,Plate_t plate){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1){
  fprintf(stderr,"\nStack not exist: %hi\n",stack);
  return FALSE;
 }
 aux = stacks[index];
 stacks[index].stack = realloc(stacks[index].stack,sizeof(Plate_t)*(stacks[index].size+1));
 if(stacks[index].stack == NULL){
  stacks[index] = aux;
  fprintf(stderr,"\nFailure on realloc\n");
  return FALSE;
 }
 (stacks[index].stack)[(stacks[index].size)++] = plate;
 return TRUE;
/**
 *@}
 */
}

/**
 *@fn Plate_t stack_pop
 *@brief Remove one plate from the \p stack
 *
 *@details Example
 *@code
 * Plate_t new_plate = stack_pop(my_stack);
 * @endcode
 *
 *@return It returns the plate or garbage
 * when the memory is empty or the stack
 * don't exist.
 *
 */
Plate_t stack_pop(Stack_id stack){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1){
  fprintf(stderr,"\nStack not exist: %hi\n",stack);
  return;
 }
 if(stack_is_empty(stack)){
  fprintf(stderr,"\nStack %hi is empty!\n",stack);
  return;
 }
 Plate_t plate = (stacks[index].stack)[stacks[index].size-1];
 aux = stacks[index];
 stacks[index].stack = realloc(stacks[index].stack,sizeof(Plate_t)*(--(stacks[index].size)));
 if((stacks[index].stack == NULL)&&(stacks[index].size != 0)){
  stacks[index] = aux;
  fprintf(stderr,"\nFailure on realloc\n");
  ++(stacks[index].size);
 }
 return plate;
/**
 *@}
 */
}

/**
 *@fn Plate_t stack_see_top
 *@brief Returns one plate of the stack
 * without removing it.
 *
 *@details Example
 *@code
 * Plate_t new_plate = stack_see_top(my_stack);
 * @endcode
 *
 *@return It returns the plate or garbage
 * when the memory is empty or the stack
 * don't exist.
 *
 *@see stack_pop
 *
 */
Plate_t stack_see_top(Stack_id stack){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1){
  fprintf(stderr,"\nStack not exist: %hi\n",stack);
  return;
 }
 if(stack_is_empty(stack)){
  fprintf(stderr,"\nStack %hi is empty!\n",stack);
  return;
 }
 return (stacks[index].stack)[stacks[index].size-1];
/**
 *@}
 */
}

/**
 *@fn Bool_t stack_free
 *@brief Destroy \p stack
 *
 *@return Returns TRUE on succes and
 * FALSE on FAILURE
 *
 *@see stacks_free
 *
 */
Bool_t stack_free(Stack_id stack){
/**
 *@{
 */
 Stack_id index = stack_get_index(stack);
 if(index == -1){
  fprintf(stderr,"\nStack not exist: %hi\n",stack);
  return FALSE;
 }
 if(number_of_stacks == 1){
  free(stacks[0].stack);
  free(stacks);
  stacks = NULL;
  number_of_stacks = 0;
  return TRUE;
 }
 aux = stacks[number_of_stacks-1];
 err = stacks;
 stacks = realloc(stacks,sizeof(aux)*(--number_of_stacks));
 if(stacks == NULL){
  stacks = err;
  ++number_of_stacks;
  fprintf(stderr,"\nFailure on realloc\n");
  return FALSE;
 }
 if(index == number_of_stacks-1){
  free(aux.stack);
  return TRUE;
 }else{
  free(stacks[index].stack);
  stacks[index] = aux;
  return TRUE;
 }
/**
 *@}
 */
}

/**
 *@fn Bool_t stacks_free
 *@brief Destroy all stacks
 *
 *@return It returns TRUE on success
 * and FALSE on failure.
 *
 *@see stack_free
 *
 */
Bool_t stacks_free( void ){
/**
 *@{
 */
 if(number_of_stacks==0){
  return TRUE;
 }
 {
  register unsigned short int i;
  for(i=0;i<number_of_stacks;++i){
   free(stacks[i].stack);
  }
 }
 free(stacks);
 stacks = NULL;
 number_of_stacks = 0;
 return TRUE;
/**
 *@}
 */
}

/**
 *@}
 */

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Google Code Jam 2010 - Africa Classification Round

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