Extend the index parameter checking from sk_value to sk_set(). Also tidy up

[thirdparty/openssl.git] / crypto / stack / 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>
#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 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);
        }

static int internal_find(STACK *st, char *data, int ret_val_options)
        {
        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 **)OBJ_bsearch_ex((char *)&data,(char *)st->data,
                st->num,sizeof(char *),comp_func,ret_val_options);
        if (r == NULL) return(-1);
        return((int)(r-st->data));
        }

int sk_find(STACK *st, char *data)
        {
        return internal_find(st, data, OBJ_BSEARCH_FIRST_VALUE_ON_MATCH);
        }
int sk_find_ex(STACK *st, char *data)
        {
        return internal_find(st, data, OBJ_BSEARCH_VALUE_ON_NOMATCH);
        }

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;
                }
        }