crypto/stack/stack.c

   1 /* crypto/stack/stack.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 /* Code for stacks
  60  * Author - Eric Young v 1.0
  61  * 1.2 eay 12-Mar-97 -  Modified sk_find so that it _DOES_ return the
  62  *                      lowest index for the seached item.
  63  *
  64  * 1.1 eay - Take from netdb and added to SSLeay
  65  *
  66  * 1.0 eay - First version 29/07/92
  67  */
  68 #include <stdio.h>
  69 #include "cryptlib.h"
  70 #include <openssl/stack.h>
  71
  72 #undef MIN_NODES
  73 #define MIN_NODES       4
  74
  75 const char *STACK_version="Stack" OPENSSL_VERSION_PTEXT;
  76
  77 #define FP_ICC  (int (*)(const void *,const void *))
  78 #include <errno.h>
  79
  80 int (*sk_set_cmp_func(STACK *sk, int (*c)()))(void)
  81         {
  82         int (*old)()=sk->comp;
  83
  84         if (sk->comp != c)
  85                 sk->sorted=0;
  86         sk->comp=c;
  87
  88         return old;
  89         }
  90
  91 STACK *sk_dup(STACK *sk)
  92         {
  93         STACK *ret;
  94         char **s;
  95
  96         if ((ret=sk_new(sk->comp)) == NULL) goto err;
  97         s=(char **)Realloc((char *)ret->data,
  98                 (unsigned int)sizeof(char *)*sk->num_alloc);
  99         if (s == NULL) goto err;
 100         ret->data=s;
 101
 102         ret->num=sk->num;
 103         memcpy(ret->data,sk->data,sizeof(char *)*sk->num);
 104         ret->sorted=sk->sorted;
 105         ret->num_alloc=sk->num_alloc;
 106         ret->comp=sk->comp;
 107         return(ret);
 108 err:
 109         return(NULL);
 110         }
 111
 112 STACK *sk_new(int (*c)())
 113         {
 114         STACK *ret;
 115         int i;
 116
 117         if ((ret=(STACK *)Malloc(sizeof(STACK))) == NULL)
 118                 goto err0;
 119         if ((ret->data=(char **)Malloc(sizeof(char *)*MIN_NODES)) == NULL)
 120                 goto err1;
 121         for (i=0; i<MIN_NODES; i++)
 122                 ret->data[i]=NULL;
 123         ret->comp=c;
 124         ret->num_alloc=MIN_NODES;
 125         ret->num=0;
 126         ret->sorted=0;
 127         return(ret);
 128 err1:
 129         Free((char *)ret);
 130 err0:
 131         return(NULL);
 132         }
 133
 134 int sk_insert(STACK *st, char *data, int loc)
 135         {
 136         char **s;
 137
 138         if (st->num_alloc <= st->num+1)
 139                 {
 140                 s=(char **)Realloc((char *)st->data,
 141                         (unsigned int)sizeof(char *)*st->num_alloc*2);
 142                 if (s == NULL)
 143                         return(0);
 144                 st->data=s;
 145                 st->num_alloc*=2;
 146                 }
 147         if ((loc >= (int)st->num) || (loc < 0))
 148                 st->data[st->num]=data;
 149         else
 150                 {
 151                 int i;
 152                 char **f,**t;
 153
 154                 f=(char **)st->data;
 155                 t=(char **)&(st->data[1]);
 156                 for (i=st->num; i>=loc; i--)
 157                         t[i]=f[i];
 158
 159 #ifdef undef /* no memmove on sunos :-( */
 160                 memmove( (char *)&(st->data[loc+1]),
 161                         (char *)&(st->data[loc]),
 162                         sizeof(char *)*(st->num-loc));
 163 #endif
 164                 st->data[loc]=data;
 165                 }
 166         st->num++;
 167         st->sorted=0;
 168         return(st->num);
 169         }
 170
 171 char *sk_delete_ptr(STACK *st, char *p)
 172         {
 173         int i;
 174
 175         for (i=0; i<st->num; i++)
 176                 if (st->data[i] == p)
 177                         return(sk_delete(st,i));
 178         return(NULL);
 179         }
 180
 181 char *sk_delete(STACK *st, int loc)
 182         {
 183         char *ret;
 184         int i,j;
 185
 186         if ((st->num == 0) || (loc < 0) || (loc >= st->num)) return(NULL);
 187
 188         ret=st->data[loc];
 189         if (loc != st->num-1)
 190                 {
 191                 j=st->num-1;
 192                 for (i=loc; i<j; i++)
 193                         st->data[i]=st->data[i+1];
 194                 /* In theory memcpy is not safe for this
 195                  * memcpy( &(st->data[loc]),
 196                  *      &(st->data[loc+1]),
 197                  *      sizeof(char *)*(st->num-loc-1));
 198                  */
 199                 }
 200         st->num--;
 201         return(ret);
 202         }
 203
 204 int sk_find(STACK *st, char *data)
 205         {
 206         char **r;
 207         int i;
 208         int (*comp_func)();
 209
 210         if (st->comp == NULL)
 211                 {
 212                 for (i=0; i<st->num; i++)
 213                         if (st->data[i] == data)
 214                                 return(i);
 215                 return(-1);
 216                 }
 217         comp_func=(int (*)())st->comp;
 218         if (!st->sorted)
 219                 {
 220                 qsort((char *)st->data,st->num,sizeof(char *),FP_ICC comp_func);
 221                 st->sorted=1;
 222                 }
 223         if (data == NULL) return(-1);
 224         r=(char **)bsearch(&data,(char *)st->data,
 225                 st->num,sizeof(char *),FP_ICC comp_func);
 226         if (r == NULL) return(-1);
 227         i=(int)(r-st->data);
 228         for ( ; i>0; i--)
 229                 if ((*st->comp)(&(st->data[i-1]),&data) < 0)
 230                         break;
 231         return(i);
 232         }
 233
 234 int sk_push(STACK *st, char *data)
 235         {
 236         return(sk_insert(st,data,st->num));
 237         }
 238
 239 int sk_unshift(STACK *st, char *data)
 240         {
 241         return(sk_insert(st,data,0));
 242         }
 243
 244 char *sk_shift(STACK *st)
 245         {
 246         if (st == NULL) return(NULL);
 247         if (st->num <= 0) return(NULL);
 248         return(sk_delete(st,0));
 249         }
 250
 251 char *sk_pop(STACK *st)
 252         {
 253         if (st == NULL) return(NULL);
 254         if (st->num <= 0) return(NULL);
 255         return(sk_delete(st,st->num-1));
 256         }
 257
 258 void sk_zero(STACK *st)
 259         {
 260         if (st == NULL) return;
 261         if (st->num <= 0) return;
 262         memset((char *)st->data,0,sizeof(st->data)*st->num);
 263         st->num=0;
 264         }
 265
 266 void sk_pop_free(STACK *st, void (*func)())
 267         {
 268         int i;
 269
 270         if (st == NULL) return;
 271         for (i=0; i<st->num; i++)
 272                 if (st->data[i] != NULL)
 273                         func(st->data[i]);
 274         sk_free(st);
 275         }
 276
 277 void sk_free(STACK *st)
 278         {
 279         if (st == NULL) return;
 280         if (st->data != NULL) Free((char *)st->data);
 281         Free((char *)st);
 282         }
 283