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334 lines
8.4 KiB
334 lines
8.4 KiB
/* crypto/stack/stack.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* Code for stacks
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* Author - Eric Young v 1.0
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* 1.2 eay 12-Mar-97 - Modified sk_find so that it _DOES_ return the
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* lowest index for the searched item.
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*
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* 1.1 eay - Take from netdb and added to SSLeay
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*
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* 1.0 eay - First version 29/07/92
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/stack.h>
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#include <openssl/objects.h>
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#undef MIN_NODES
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#define MIN_NODES 4
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const char STACK_version[]="Stack" OPENSSL_VERSION_PTEXT;
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#include <errno.h>
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int (*sk_set_cmp_func(_STACK *sk, int (*c)(const void *, const void *)))
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(const void *, const void *)
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{
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int (*old)(const void *,const void *)=sk->comp;
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if (sk->comp != c)
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sk->sorted=0;
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sk->comp=c;
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return old;
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}
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_STACK *sk_dup(_STACK *sk)
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{
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_STACK *ret;
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char **s;
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if ((ret=sk_new(sk->comp)) == NULL) goto err;
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s=(char **)OPENSSL_realloc((char *)ret->data,
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(unsigned int)sizeof(char *)*sk->num_alloc);
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if (s == NULL) goto err;
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ret->data=s;
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ret->num=sk->num;
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memcpy(ret->data,sk->data,sizeof(char *)*sk->num);
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ret->sorted=sk->sorted;
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ret->num_alloc=sk->num_alloc;
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ret->comp=sk->comp;
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return(ret);
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err:
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if(ret)
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sk_free(ret);
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return(NULL);
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}
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_STACK *sk_new_null(void)
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{
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return sk_new((int (*)(const void *, const void *))0);
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}
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_STACK *sk_new(int (*c)(const void *, const void *))
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{
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_STACK *ret;
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int i;
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if ((ret=OPENSSL_malloc(sizeof(_STACK))) == NULL)
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goto err;
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if ((ret->data=OPENSSL_malloc(sizeof(char *)*MIN_NODES)) == NULL)
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goto err;
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for (i=0; i<MIN_NODES; i++)
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ret->data[i]=NULL;
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ret->comp=c;
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ret->num_alloc=MIN_NODES;
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ret->num=0;
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ret->sorted=0;
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return(ret);
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err:
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if(ret)
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OPENSSL_free(ret);
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return(NULL);
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}
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int sk_insert(_STACK *st, void *data, int loc)
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{
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char **s;
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if(st == NULL) return 0;
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if (st->num_alloc <= st->num+1)
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{
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s=OPENSSL_realloc((char *)st->data,
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(unsigned int)sizeof(char *)*st->num_alloc*2);
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if (s == NULL)
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return(0);
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st->data=s;
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st->num_alloc*=2;
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}
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if ((loc >= (int)st->num) || (loc < 0))
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st->data[st->num]=data;
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else
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{
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int i;
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char **f,**t;
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f=st->data;
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t=&(st->data[1]);
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for (i=st->num; i>=loc; i--)
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t[i]=f[i];
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#ifdef undef /* no memmove on sunos :-( */
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memmove(&(st->data[loc+1]),
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&(st->data[loc]),
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sizeof(char *)*(st->num-loc));
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#endif
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st->data[loc]=data;
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}
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st->num++;
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st->sorted=0;
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return(st->num);
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}
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void *sk_delete_ptr(_STACK *st, void *p)
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{
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int i;
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for (i=0; i<st->num; i++)
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if (st->data[i] == p)
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return(sk_delete(st,i));
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return(NULL);
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}
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void *sk_delete(_STACK *st, int loc)
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{
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char *ret;
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int i,j;
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if(!st || (loc < 0) || (loc >= st->num)) return NULL;
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ret=st->data[loc];
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if (loc != st->num-1)
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{
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j=st->num-1;
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for (i=loc; i<j; i++)
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st->data[i]=st->data[i+1];
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/* In theory memcpy is not safe for this
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* memcpy( &(st->data[loc]),
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* &(st->data[loc+1]),
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* sizeof(char *)*(st->num-loc-1));
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*/
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}
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st->num--;
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return(ret);
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}
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static int internal_find(_STACK *st, void *data, int ret_val_options)
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{
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const void * const *r;
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int i;
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if(st == NULL) return -1;
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if (st->comp == NULL)
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{
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for (i=0; i<st->num; i++)
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if (st->data[i] == data)
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return(i);
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return(-1);
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}
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sk_sort(st);
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if (data == NULL) return(-1);
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r=OBJ_bsearch_ex_(&data,st->data,st->num,sizeof(void *),st->comp,
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ret_val_options);
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if (r == NULL) return(-1);
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return (int)((char **)r-st->data);
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}
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int sk_find(_STACK *st, void *data)
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{
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return internal_find(st, data, OBJ_BSEARCH_FIRST_VALUE_ON_MATCH);
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}
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int sk_find_ex(_STACK *st, void *data)
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{
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return internal_find(st, data, OBJ_BSEARCH_VALUE_ON_NOMATCH);
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}
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int sk_push(_STACK *st, void *data)
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{
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return(sk_insert(st,data,st->num));
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}
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int sk_unshift(_STACK *st, void *data)
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{
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return(sk_insert(st,data,0));
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}
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void *sk_shift(_STACK *st)
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{
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if (st == NULL) return(NULL);
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if (st->num <= 0) return(NULL);
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return(sk_delete(st,0));
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}
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void *sk_pop(_STACK *st)
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{
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if (st == NULL) return(NULL);
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if (st->num <= 0) return(NULL);
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return(sk_delete(st,st->num-1));
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}
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void sk_zero(_STACK *st)
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{
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if (st == NULL) return;
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if (st->num <= 0) return;
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memset((char *)st->data,0,sizeof(st->data)*st->num);
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st->num=0;
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}
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void sk_pop_free(_STACK *st, void (*func)(void *))
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{
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int i;
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if (st == NULL) return;
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for (i=0; i<st->num; i++)
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if (st->data[i] != NULL)
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func(st->data[i]);
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sk_free(st);
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}
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void sk_free(_STACK *st)
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{
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if (st == NULL) return;
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if (st->data != NULL) OPENSSL_free(st->data);
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OPENSSL_free(st);
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}
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int sk_num(const _STACK *st)
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{
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if(st == NULL) return -1;
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return st->num;
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}
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void *sk_value(const _STACK *st, int i)
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{
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if(!st || (i < 0) || (i >= st->num)) return NULL;
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return st->data[i];
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}
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void *sk_set(_STACK *st, int i, void *value)
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{
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if(!st || (i < 0) || (i >= st->num)) return NULL;
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return (st->data[i] = value);
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}
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void sk_sort(_STACK *st)
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{
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if (st && !st->sorted)
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{
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int (*comp_func)(const void *,const void *);
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/* same comment as in sk_find ... previously st->comp was declared
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* as a (void*,void*) callback type, but this made the population
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* of the callback pointer illogical - our callbacks compare
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* type** with type**, so we leave the casting until absolutely
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* necessary (ie. "now"). */
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comp_func=(int (*)(const void *,const void *))(st->comp);
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qsort(st->data,st->num,sizeof(char *), comp_func);
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st->sorted=1;
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}
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}
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int sk_is_sorted(const _STACK *st)
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{
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if (!st)
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return 1;
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return st->sorted;
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}
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