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 == NULL) return 0;
 139         if (st->num_alloc <= st->num+1)
 140                 {
 141                 s=(char **)Realloc((char *)st->data,
 142                         (unsigned int)sizeof(char *)*st->num_alloc*2);
 143                 if (s == NULL)
 144                         return(0);
 145                 st->data=s;
 146                 st->num_alloc*=2;
 147                 }
 148         if ((loc >= (int)st->num) || (loc < 0))
 149                 st->data[st->num]=data;
 150         else
 151                 {
 152                 int i;
 153                 char **f,**t;
 154
 155                 f=(char **)st->data;
 156                 t=(char **)&(st->data[1]);
 157                 for (i=st->num; i>=loc; i--)
 158                         t[i]=f[i];
 159
 160 #ifdef undef /* no memmove on sunos :-( */
 161                 memmove( (char *)&(st->data[loc+1]),
 162                         (char *)&(st->data[loc]),
 163                         sizeof(char *)*(st->num-loc));
 164 #endif
 165                 st->data[loc]=data;
 166                 }
 167         st->num++;
 168         st->sorted=0;
 169         return(st->num);
 170         }
 171
 172 char *sk_delete_ptr(STACK *st, char *p)
 173         {
 174         int i;
 175
 176         for (i=0; i<st->num; i++)
 177                 if (st->data[i] == p)
 178                         return(sk_delete(st,i));
 179         return(NULL);
 180         }
 181
 182 char *sk_delete(STACK *st, int loc)
 183         {
 184         char *ret;
 185         int i,j;
 186
 187         if ((st == NULL) || (st->num == 0) || (loc < 0)
 188                                          || (loc >= st->num)) return(NULL);
 189
 190         ret=st->data[loc];
 191         if (loc != st->num-1)
 192                 {
 193                 j=st->num-1;
 194                 for (i=loc; i<j; i++)
 195                         st->data[i]=st->data[i+1];
 196                 /* In theory memcpy is not safe for this
 197                  * memcpy( &(st->data[loc]),
 198                  *      &(st->data[loc+1]),
 199                  *      sizeof(char *)*(st->num-loc-1));
 200                  */
 201                 }
 202         st->num--;
 203         return(ret);
 204         }
 205
 206 int sk_find(STACK *st, char *data)
 207         {
 208         char **r;
 209         int i;
 210         int (*comp_func)();
 211         if(st == NULL) return -1;
 212
 213         if (st->comp == NULL)
 214                 {
 215                 for (i=0; i<st->num; i++)
 216                         if (st->data[i] == data)
 217                                 return(i);
 218                 return(-1);
 219                 }
 220         comp_func=(int (*)())st->comp;
 221         if (!st->sorted)
 222                 {
 223                 qsort((char *)st->data,st->num,sizeof(char *),FP_ICC comp_func);
 224                 st->sorted=1;
 225                 }
 226         if (data == NULL) return(-1);
 227         r=(char **)bsearch(&data,(char *)st->data,
 228                 st->num,sizeof(char *),FP_ICC comp_func);
 229         if (r == NULL) return(-1);
 230         i=(int)(r-st->data);
 231         for ( ; i>0; i--)
 232                 if ((*st->comp)(&(st->data[i-1]),&data) < 0)
 233                         break;
 234         return(i);
 235         }
 236
 237 int sk_push(STACK *st, char *data)
 238         {
 239         return(sk_insert(st,data,st->num));
 240         }
 241
 242 int sk_unshift(STACK *st, char *data)
 243         {
 244         return(sk_insert(st,data,0));
 245         }
 246
 247 char *sk_shift(STACK *st)
 248         {
 249         if (st == NULL) return(NULL);
 250         if (st->num <= 0) return(NULL);
 251         return(sk_delete(st,0));
 252         }
 253
 254 char *sk_pop(STACK *st)
 255         {
 256         if (st == NULL) return(NULL);
 257         if (st->num <= 0) return(NULL);
 258         return(sk_delete(st,st->num-1));
 259         }
 260
 261 void sk_zero(STACK *st)
 262         {
 263         if (st == NULL) return;
 264         if (st->num <= 0) return;
 265         memset((char *)st->data,0,sizeof(st->data)*st->num);
 266         st->num=0;
 267         }
 268
 269 void sk_pop_free(STACK *st, void (*func)())
 270         {
 271         int i;
 272
 273         if (st == NULL) return;
 274         for (i=0; i<st->num; i++)
 275                 if (st->data[i] != NULL)
 276                         func(st->data[i]);
 277         sk_free(st);
 278         }
 279
 280 void sk_free(STACK *st)
 281         {
 282         if (st == NULL) return;
 283         if (st->data != NULL) Free((char *)st->data);
 284         Free((char *)st);
 285         }
 286