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stack.c

/* crypto/stack/stack.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* Code for stacks
 * Author - Eric Young v 1.0
 * 1.2 eay 12-Mar-97 -  Modified sk_find so that it _DOES_ return the
 *                lowest index for the searched item.
 *
 * 1.1 eay - Take from netdb and added to SSLeay
 *
 * 1.0 eay - First version 29/07/92
 */
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/stack.h>

#undef MIN_NODES
#define MIN_NODES 4

const char *STACK_version="Stack" OPENSSL_VERSION_PTEXT;

#include <errno.h>

int (*sk_set_cmp_func(STACK *sk, int (*c)(const char * const *,const char * const *)))
            (const char * const *, const char * const *)
      {
      int (*old)(const char * const *,const char * const *)=sk->comp;

      if (sk->comp != c)
            sk->sorted=0;
      sk->comp=c;

      return old;
      }

STACK *sk_dup(STACK *sk)
      {
      STACK *ret;
      char **s;

      if ((ret=sk_new(sk->comp)) == NULL) goto err;
      s=(char **)OPENSSL_realloc((char *)ret->data,
            (unsigned int)sizeof(char *)*sk->num_alloc);
      if (s == NULL) goto err;
      ret->data=s;

      ret->num=sk->num;
      memcpy(ret->data,sk->data,sizeof(char *)*sk->num);
      ret->sorted=sk->sorted;
      ret->num_alloc=sk->num_alloc;
      ret->comp=sk->comp;
      return(ret);
err:
      if(ret)
            sk_free(ret);
      return(NULL);
      }

STACK *sk_new_null(void)
      {
      return sk_new((int (*)(const char * const *, const char * const *))0);
      }

STACK *sk_new(int (*c)(const char * const *, const char * const *))
      {
      STACK *ret;
      int i;

      if ((ret=(STACK *)OPENSSL_malloc(sizeof(STACK))) == NULL)
            goto err;
      if ((ret->data=(char **)OPENSSL_malloc(sizeof(char *)*MIN_NODES)) == NULL)
            goto err;
      for (i=0; i<MIN_NODES; i++)
            ret->data[i]=NULL;
      ret->comp=c;
      ret->num_alloc=MIN_NODES;
      ret->num=0;
      ret->sorted=0;
      return(ret);
err:
      if(ret)
            OPENSSL_free(ret);
      return(NULL);
      }

int sk_insert(STACK *st, char *data, int loc)
      {
      char **s;

      if(st == NULL) return 0;
      if (st->num_alloc <= st->num+1)
            {
            s=(char **)OPENSSL_realloc((char *)st->data,
                  (unsigned int)sizeof(char *)*st->num_alloc*2);
            if (s == NULL)
                  return(0);
            st->data=s;
            st->num_alloc*=2;
            }
      if ((loc >= (int)st->num) || (loc < 0))
            st->data[st->num]=data;
      else
            {
            int i;
            char **f,**t;

            f=(char **)st->data;
            t=(char **)&(st->data[1]);
            for (i=st->num; i>=loc; i--)
                  t[i]=f[i];
                  
#ifdef undef /* no memmove on sunos :-( */
            memmove( (char *)&(st->data[loc+1]),
                  (char *)&(st->data[loc]),
                  sizeof(char *)*(st->num-loc));
#endif
            st->data[loc]=data;
            }
      st->num++;
      st->sorted=0;
      return(st->num);
      }

char *sk_delete_ptr(STACK *st, char *p)
      {
      int i;

      for (i=0; i<st->num; i++)
            if (st->data[i] == p)
                  return(sk_delete(st,i));
      return(NULL);
      }

char *sk_delete(STACK *st, int loc)
      {
      char *ret;
      int i,j;

      if(!st || (loc < 0) || (loc >= st->num)) return NULL;

      ret=st->data[loc];
      if (loc != st->num-1)
            {
            j=st->num-1;
            for (i=loc; i<j; i++)
                  st->data[i]=st->data[i+1];
            /* In theory memcpy is not safe for this
             * memcpy( &(st->data[loc]),
             *    &(st->data[loc+1]),
             *    sizeof(char *)*(st->num-loc-1));
             */
            }
      st->num--;
      return(ret);
      }

int sk_find(STACK *st, char *data)
      {
      char **r;
      int i;
      int (*comp_func)(const void *,const void *);
      if(st == NULL) return -1;

      if (st->comp == NULL)
            {
            for (i=0; i<st->num; i++)
                  if (st->data[i] == data)
                        return(i);
            return(-1);
            }
      sk_sort(st);
      if (data == NULL) return(-1);
      /* This (and the "qsort" below) are the two places in OpenSSL
       * where we need to convert from our standard (type **,type **)
       * compare callback type to the (void *,void *) type required by
       * bsearch. However, the "data" it is being called(back) with are
       * not (type *) pointers, but the *pointers* to (type *) pointers,
       * so we get our extra level of pointer dereferencing that way. */
      comp_func=(int (*)(const void *,const void *))(st->comp);
      r=(char **)bsearch(&data,(char *)st->data,
            st->num,sizeof(char *), comp_func);
      if (r == NULL) return(-1);
      i=(int)(r-st->data);
      for ( ; i>0; i--)
            /* This needs a cast because the type being pointed to from
             * the "&" expressions are (char *) rather than (const char *).
             * For an explanation, read:
             * http://www.eskimo.com/~scs/C-faq/q11.10.html :-) */
            if ((*st->comp)((const char * const *)&(st->data[i-1]),
                        (const char * const *)&data) < 0)
                  break;
      return(i);
      }

int sk_push(STACK *st, char *data)
      {
      return(sk_insert(st,data,st->num));
      }

int sk_unshift(STACK *st, char *data)
      {
      return(sk_insert(st,data,0));
      }

char *sk_shift(STACK *st)
      {
      if (st == NULL) return(NULL);
      if (st->num <= 0) return(NULL);
      return(sk_delete(st,0));
      }

char *sk_pop(STACK *st)
      {
      if (st == NULL) return(NULL);
      if (st->num <= 0) return(NULL);
      return(sk_delete(st,st->num-1));
      }

void sk_zero(STACK *st)
      {
      if (st == NULL) return;
      if (st->num <= 0) return;
      memset((char *)st->data,0,sizeof(st->data)*st->num);
      st->num=0;
      }

void sk_pop_free(STACK *st, void (*func)(void *))
      {
      int i;

      if (st == NULL) return;
      for (i=0; i<st->num; i++)
            if (st->data[i] != NULL)
                  func(st->data[i]);
      sk_free(st);
      }

void sk_free(STACK *st)
      {
      if (st == NULL) return;
      if (st->data != NULL) OPENSSL_free(st->data);
      OPENSSL_free(st);
      }

int sk_num(const STACK *st)
{
      if(st == NULL) return -1;
      return st->num;
}

char *sk_value(const STACK *st, int i)
{
      if(!st || (i < 0) || (i >= st->num)) return NULL;
      return st->data[i];
}

char *sk_set(STACK *st, int i, char *value)
{
      if(!st || (i < 0) || (i >= st->num)) return NULL;
      return (st->data[i] = value);
}

void sk_sort(STACK *st)
      {
      if (st && !st->sorted)
            {
            int (*comp_func)(const void *,const void *);

            /* same comment as in sk_find ... previously st->comp was declared
             * as a (void*,void*) callback type, but this made the population
             * of the callback pointer illogical - our callbacks compare
             * type** with type**, so we leave the casting until absolutely
             * necessary (ie. "now"). */
            comp_func=(int (*)(const void *,const void *))(st->comp);
            qsort(st->data,st->num,sizeof(char *), comp_func);
            st->sorted=1;
            }
      }

int sk_is_sorted(const STACK *st)
      {
      if (!st)
            return 1;
      return st->sorted;
      }

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