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 searched 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 #include <errno.h> 78 79 int (*sk_set_cmp_func(STACK *sk, int (*c)(const char * const *,const char * const *))) 80 (const char * const *, const char * const *) 81 { 82 int (*old)(const char * const *,const char * const *)=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 **)OPENSSL_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 if(ret) 110 sk_free(ret); 111 return(NULL); 112 } 113 114 STACK *sk_new_null(void) 115 { 116 return sk_new((int (*)(const char * const *, const char * const *))0); 117 } 118 119 STACK *sk_new(int (*c)(const char * const *, const char * const *)) 120 { 121 STACK *ret; 122 int i; 123 124 if ((ret=(STACK *)OPENSSL_malloc(sizeof(STACK))) == NULL) 125 goto err; 126 if ((ret->data=(char **)OPENSSL_malloc(sizeof(char *)*MIN_NODES)) == NULL) 127 goto err; 128 for (i=0; i<MIN_NODES; i++) 129 ret->data[i]=NULL; 130 ret->comp=c; 131 ret->num_alloc=MIN_NODES; 132 ret->num=0; 133 ret->sorted=0; 134 return(ret); 135 err: 136 if(ret) 137 OPENSSL_free(ret); 138 return(NULL); 139 } 140 141 int sk_insert(STACK *st, char *data, int loc) 142 { 143 char **s; 144 145 if(st == NULL) return 0; 146 if (st->num_alloc <= st->num+1) 147 { 148 s=(char **)OPENSSL_realloc((char *)st->data, 149 (unsigned int)sizeof(char *)*st->num_alloc*2); 150 if (s == NULL) 151 return(0); 152 st->data=s; 153 st->num_alloc*=2; 154 } 155 if ((loc >= (int)st->num) || (loc < 0)) 156 st->data[st->num]=data; 157 else 158 { 159 int i; 160 char **f,**t; 161 162 f=(char **)st->data; 163 t=(char **)&(st->data[1]); 164 for (i=st->num; i>=loc; i--) 165 t[i]=f[i]; 166 167 #ifdef undef /* no memmove on sunos :-( */ 168 memmove( (char *)&(st->data[loc+1]), 169 (char *)&(st->data[loc]), 170 sizeof(char *)*(st->num-loc)); 171 #endif 172 st->data[loc]=data; 173 } 174 st->num++; 175 st->sorted=0; 176 return(st->num); 177 } 178 179 char *sk_delete_ptr(STACK *st, char *p) 180 { 181 int i; 182 183 for (i=0; i<st->num; i++) 184 if (st->data[i] == p) 185 return(sk_delete(st,i)); 186 return(NULL); 187 } 188 189 char *sk_delete(STACK *st, int loc) 190 { 191 char *ret; 192 int i,j; 193 194 if ((st == NULL) || (st->num == 0) || (loc < 0) 195 || (loc >= st->num)) return(NULL); 196 197 ret=st->data[loc]; 198 if (loc != st->num-1) 199 { 200 j=st->num-1; 201 for (i=loc; i<j; i++) 202 st->data[i]=st->data[i+1]; 203 /* In theory memcpy is not safe for this 204 * memcpy( &(st->data[loc]), 205 * &(st->data[loc+1]), 206 * sizeof(char *)*(st->num-loc-1)); 207 */ 208 } 209 st->num--; 210 return(ret); 211 } 212 213 int sk_find(STACK *st, char *data) 214 { 215 char **r; 216 int i; 217 int (*comp_func)(const void *,const void *); 218 if(st == NULL) return -1; 219 220 if (st->comp == NULL) 221 { 222 for (i=0; i<st->num; i++) 223 if (st->data[i] == data) 224 return(i); 225 return(-1); 226 } 227 sk_sort(st); 228 if (data == NULL) return(-1); 229 /* This (and the "qsort" below) are the two places in OpenSSL 230 * where we need to convert from our standard (type **,type **) 231 * compare callback type to the (void *,void *) type required by 232 * bsearch. However, the "data" it is being called(back) with are 233 * not (type *) pointers, but the *pointers* to (type *) pointers, 234 * so we get our extra level of pointer dereferencing that way. */ 235 comp_func=(int (*)(const void *,const void *))(st->comp); 236 r=(char **)bsearch(&data,(char *)st->data, 237 st->num,sizeof(char *), comp_func); 238 if (r == NULL) return(-1); 239 i=(int)(r-st->data); 240 for ( ; i>0; i--) 241 /* This needs a cast because the type being pointed to from 242 * the "&" expressions are (char *) rather than (const char *). 243 * For an explanation, read: 244 * http://www.eskimo.com/~scs/C-faq/q11.10.html :-) */ 245 if ((*st->comp)((const char * const *)&(st->data[i-1]), 246 (const char * const *)&data) < 0) 247 break; 248 return(i); 249 } 250 251 int sk_push(STACK *st, char *data) 252 { 253 return(sk_insert(st,data,st->num)); 254 } 255 256 int sk_unshift(STACK *st, char *data) 257 { 258 return(sk_insert(st,data,0)); 259 } 260 261 char *sk_shift(STACK *st) 262 { 263 if (st == NULL) return(NULL); 264 if (st->num <= 0) return(NULL); 265 return(sk_delete(st,0)); 266 } 267 268 char *sk_pop(STACK *st) 269 { 270 if (st == NULL) return(NULL); 271 if (st->num <= 0) return(NULL); 272 return(sk_delete(st,st->num-1)); 273 } 274 275 void sk_zero(STACK *st) 276 { 277 if (st == NULL) return; 278 if (st->num <= 0) return; 279 memset((char *)st->data,0,sizeof(st->data)*st->num); 280 st->num=0; 281 } 282 283 void sk_pop_free(STACK *st, void (*func)(void *)) 284 { 285 int i; 286 287 if (st == NULL) return; 288 for (i=0; i<st->num; i++) 289 if (st->data[i] != NULL) 290 func(st->data[i]); 291 sk_free(st); 292 } 293 294 void sk_free(STACK *st) 295 { 296 if (st == NULL) return; 297 if (st->data != NULL) OPENSSL_free(st->data); 298 OPENSSL_free(st); 299 } 300 301 int sk_num(const STACK *st) 302 { 303 if(st == NULL) return -1; 304 return st->num; 305 } 306 307 char *sk_value(const STACK *st, int i) 308 { 309 if(st == NULL) return NULL; 310 return st->data[i]; 311 } 312 313 char *sk_set(STACK *st, int i, char *value) 314 { 315 if(st == NULL) return NULL; 316 return (st->data[i] = value); 317 } 318 319 void sk_sort(STACK *st) 320 { 321 if (st && !st->sorted) 322 { 323 int (*comp_func)(const void *,const void *); 324 325 /* same comment as in sk_find ... previously st->comp was declared 326 * as a (void*,void*) callback type, but this made the population 327 * of the callback pointer illogical - our callbacks compare 328 * type** with type**, so we leave the casting until absolutely 329 * necessary (ie. "now"). */ 330 comp_func=(int (*)(const void *,const void *))(st->comp); 331 qsort(st->data,st->num,sizeof(char *), comp_func); 332 st->sorted=1; 333 } 334 } 335