/* 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>
#include <openssl/objects.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 void *, const void *)))
(const void *, const void *)
{
int (*old)(const void *,const void *)=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 void *, const void *))0);
}
_STACK *sk_new(int (*c)(const void *, const void *))
{
_STACK *ret;
int i;
if ((ret=OPENSSL_malloc(sizeof(_STACK))) == NULL)
goto err;
if ((ret->data=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, void *data, int loc)
{
char **s;
if(st == NULL) return 0;
if (st->num_alloc <= st->num+1)
{
s=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=st->data;
t=&(st->data[1]);
for (i=st->num; i>=loc; i--)
t[i]=f[i];
#ifdef undef /* no memmove on sunos :-( */
memmove(&(st->data[loc+1]),
&(st->data[loc]),
sizeof(char *)*(st->num-loc));
#endif
st->data[loc]=data;
}
st->num++;
st->sorted=0;
return(st->num);
}
void *sk_delete_ptr(_STACK *st, void *p)
{
int i;
for (i=0; i<st->num; i++)
if (st->data[i] == p)
return(sk_delete(st,i));
return(NULL);
}
void *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);
}
static int internal_find(_STACK *st, void *data, int ret_val_options)
{
const void * const *r;
int i;
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);
r=OBJ_bsearch_ex_(&data,st->data,st->num,sizeof(void *),st->comp,
ret_val_options);
if (r == NULL) return(-1);
return (int)((char **)r-st->data);
}
int sk_find(_STACK *st, void *data)
{
return internal_find(st, data, OBJ_BSEARCH_FIRST_VALUE_ON_MATCH);
}
int sk_find_ex(_STACK *st, void *data)
{
return internal_find(st, data, OBJ_BSEARCH_VALUE_ON_NOMATCH);
}
int sk_push(_STACK *st, void *data)
{
return(sk_insert(st,data,st->num));
}
int sk_unshift(_STACK *st, void *data)
{
return(sk_insert(st,data,0));
}
void *sk_shift(_STACK *st)
{
if (st == NULL) return(NULL);
if (st->num <= 0) return(NULL);
return(sk_delete(st,0));
}
void *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;
}
void *sk_value(const _STACK *st, int i)
{
if(!st || (i < 0) || (i >= st->num)) return NULL;
return st->data[i];
}
void *sk_set(_STACK *st, int i, void *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;
}