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
76const char STACK_version[]="Stack" OPENSSL_VERSION_PTEXT;
77
78#include <errno.h>
79
80int (*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
92STACK *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);
109err:
110	if(ret)
111		sk_free(ret);
112	return(NULL);
113	}
114
115STACK *sk_new_null(void)
116	{
117	return sk_new((int (*)(const char * const *, const char * const *))0);
118	}
119
120STACK *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);
136err:
137	if(ret)
138		OPENSSL_free(ret);
139	return(NULL);
140	}
141
142int 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
180char *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
190char *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
213static 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
242int sk_find(STACK *st, char *data)
243	{
244	return internal_find(st, data, OBJ_BSEARCH_FIRST_VALUE_ON_MATCH);
245	}
246int sk_find_ex(STACK *st, char *data)
247	{
248	return internal_find(st, data, OBJ_BSEARCH_VALUE_ON_NOMATCH);
249	}
250
251int sk_push(STACK *st, char *data)
252	{
253	return(sk_insert(st,data,st->num));
254	}
255
256int sk_unshift(STACK *st, char *data)
257	{
258	return(sk_insert(st,data,0));
259	}
260
261char *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
268char *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
275void 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
283void 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
294void 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
301int sk_num(const STACK *st)
302{
303	if(st == NULL) return -1;
304	return st->num;
305}
306
307char *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
313char *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
319void 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
336int sk_is_sorted(const STACK *st)
337	{
338	if (!st)
339		return 1;
340	return st->sorted;
341	}
342