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 #include <openssl/objects.h>
72
73 #undef MIN_NODES
74 #define MIN_NODES 4
75
76 const char STACK_version[]="Stack" OPENSSL_VERSION_PTEXT;
77
78 #include <errno.h>
79
sk_set_cmp_func(STACK * sk,int (* c)(const char * const *,const char * const *))80 int (*sk_set_cmp_func(STACK *sk, int (*c)(const char * const *,const char * const *)))
81 (const char * const *, const char * const *)
82 {
83 int (*old)(const char * const *,const char * const *)=sk->comp;
84
85 if (sk->comp != c)
86 sk->sorted=0;
87 sk->comp=c;
88
89 return old;
90 }
91
sk_dup(STACK * sk)92 STACK *sk_dup(STACK *sk)
93 {
94 STACK *ret;
95 char **s;
96
97 if ((ret=sk_new(sk->comp)) == NULL) goto err;
98 s=(char **)OPENSSL_realloc((char *)ret->data,
99 (unsigned int)sizeof(char *)*sk->num_alloc);
100 if (s == NULL) goto err;
101 ret->data=s;
102
103 ret->num=sk->num;
104 memcpy(ret->data,sk->data,sizeof(char *)*sk->num);
105 ret->sorted=sk->sorted;
106 ret->num_alloc=sk->num_alloc;
107 ret->comp=sk->comp;
108 return(ret);
109 err:
110 if(ret)
111 sk_free(ret);
112 return(NULL);
113 }
114
sk_new_null(void)115 STACK *sk_new_null(void)
116 {
117 return sk_new((int (*)(const char * const *, const char * const *))0);
118 }
119
sk_new(int (* c)(const char * const *,const char * const *))120 STACK *sk_new(int (*c)(const char * const *, const char * const *))
121 {
122 STACK *ret;
123 int i;
124
125 if ((ret=(STACK *)OPENSSL_malloc(sizeof(STACK))) == NULL)
126 goto err;
127 if ((ret->data=(char **)OPENSSL_malloc(sizeof(char *)*MIN_NODES)) == NULL)
128 goto err;
129 for (i=0; i<MIN_NODES; i++)
130 ret->data[i]=NULL;
131 ret->comp=c;
132 ret->num_alloc=MIN_NODES;
133 ret->num=0;
134 ret->sorted=0;
135 return(ret);
136 err:
137 if(ret)
138 OPENSSL_free(ret);
139 return(NULL);
140 }
141
sk_insert(STACK * st,char * data,int loc)142 int sk_insert(STACK *st, char *data, int loc)
143 {
144 char **s;
145
146 if(st == NULL) return 0;
147 if (st->num_alloc <= st->num+1)
148 {
149 s=(char **)OPENSSL_realloc((char *)st->data,
150 (unsigned int)sizeof(char *)*st->num_alloc*2);
151 if (s == NULL)
152 return(0);
153 st->data=s;
154 st->num_alloc*=2;
155 }
156 if ((loc >= (int)st->num) || (loc < 0))
157 st->data[st->num]=data;
158 else
159 {
160 int i;
161 char **f,**t;
162
163 f=(char **)st->data;
164 t=(char **)&(st->data[1]);
165 for (i=st->num; i>=loc; i--)
166 t[i]=f[i];
167
168 #ifdef undef /* no memmove on sunos :-( */
169 memmove( (char *)&(st->data[loc+1]),
170 (char *)&(st->data[loc]),
171 sizeof(char *)*(st->num-loc));
172 #endif
173 st->data[loc]=data;
174 }
175 st->num++;
176 st->sorted=0;
177 return(st->num);
178 }
179
sk_delete_ptr(STACK * st,char * p)180 char *sk_delete_ptr(STACK *st, char *p)
181 {
182 int i;
183
184 for (i=0; i<st->num; i++)
185 if (st->data[i] == p)
186 return(sk_delete(st,i));
187 return(NULL);
188 }
189
sk_delete(STACK * st,int loc)190 char *sk_delete(STACK *st, int loc)
191 {
192 char *ret;
193 int i,j;
194
195 if(!st || (loc < 0) || (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
internal_find(STACK * st,char * data,int ret_val_options)213 static int internal_find(STACK *st, char *data, int ret_val_options)
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 **)OBJ_bsearch_ex((char *)&data,(char *)st->data,
237 st->num,sizeof(char *),comp_func,ret_val_options);
238 if (r == NULL) return(-1);
239 return((int)(r-st->data));
240 }
241
sk_find(STACK * st,char * data)242 int sk_find(STACK *st, char *data)
243 {
244 return internal_find(st, data, OBJ_BSEARCH_FIRST_VALUE_ON_MATCH);
245 }
sk_find_ex(STACK * st,char * data)246 int sk_find_ex(STACK *st, char *data)
247 {
248 return internal_find(st, data, OBJ_BSEARCH_VALUE_ON_NOMATCH);
249 }
250
sk_push(STACK * st,char * data)251 int sk_push(STACK *st, char *data)
252 {
253 return(sk_insert(st,data,st->num));
254 }
255
sk_unshift(STACK * st,char * data)256 int sk_unshift(STACK *st, char *data)
257 {
258 return(sk_insert(st,data,0));
259 }
260
sk_shift(STACK * st)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
sk_pop(STACK * st)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
sk_zero(STACK * st)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
sk_pop_free(STACK * st,void (* func)(void *))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
sk_free(STACK * st)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
sk_num(const STACK * st)301 int sk_num(const STACK *st)
302 {
303 if(st == NULL) return -1;
304 return st->num;
305 }
306
sk_value(const STACK * st,int i)307 char *sk_value(const STACK *st, int i)
308 {
309 if(!st || (i < 0) || (i >= st->num)) return NULL;
310 return st->data[i];
311 }
312
sk_set(STACK * st,int i,char * value)313 char *sk_set(STACK *st, int i, char *value)
314 {
315 if(!st || (i < 0) || (i >= st->num)) return NULL;
316 return (st->data[i] = value);
317 }
318
sk_sort(STACK * st)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
sk_is_sorted(const STACK * st)336 int sk_is_sorted(const STACK *st)
337 {
338 if (!st)
339 return 1;
340 return st->sorted;
341 }
342