]>
git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/stack/stack.c
1 /* crypto/stack/stack.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
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.
64 * 1.1 eay - Take from netdb and added to SSLeay
66 * 1.0 eay - First version 29/07/92
70 #include <openssl/stack.h>
75 const char *STACK_version
="Stack" OPENSSL_VERSION_PTEXT
;
79 int (*sk_set_cmp_func(STACK
*sk
, int (*c
)(const char * const *,const char * const *)))
80 (const char * const *, const char * const *)
82 int (*old
)(const char * const *,const char * const *)=sk
->comp
;
91 STACK
*sk_dup(STACK
*sk
)
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
;
103 memcpy(ret
->data
,sk
->data
,sizeof(char *)*sk
->num
);
104 ret
->sorted
=sk
->sorted
;
105 ret
->num_alloc
=sk
->num_alloc
;
112 STACK
*sk_new(int (*c
)(const char * const *, const char * const *))
117 if ((ret
=(STACK
*)OPENSSL_malloc(sizeof(STACK
))) == NULL
)
119 if ((ret
->data
=(char **)OPENSSL_malloc(sizeof(char *)*MIN_NODES
)) == NULL
)
121 for (i
=0; i
<MIN_NODES
; i
++)
124 ret
->num_alloc
=MIN_NODES
;
134 int sk_insert(STACK
*st
, char *data
, int loc
)
138 if(st
== NULL
) return 0;
139 if (st
->num_alloc
<= st
->num
+1)
141 s
=(char **)OPENSSL_realloc((char *)st
->data
,
142 (unsigned int)sizeof(char *)*st
->num_alloc
*2);
148 if ((loc
>= (int)st
->num
) || (loc
< 0))
149 st
->data
[st
->num
]=data
;
156 t
=(char **)&(st
->data
[1]);
157 for (i
=st
->num
; i
>=loc
; i
--)
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
));
172 char *sk_delete_ptr(STACK
*st
, char *p
)
176 for (i
=0; i
<st
->num
; i
++)
177 if (st
->data
[i
] == p
)
178 return(sk_delete(st
,i
));
182 char *sk_delete(STACK
*st
, int loc
)
187 if ((st
== NULL
) || (st
->num
== 0) || (loc
< 0)
188 || (loc
>= st
->num
)) return(NULL
);
191 if (loc
!= 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));
206 int sk_find(STACK
*st
, char *data
)
210 int (*comp_func
)(const void *,const void *);
211 if(st
== NULL
) return -1;
213 if (st
->comp
== NULL
)
215 for (i
=0; i
<st
->num
; i
++)
216 if (st
->data
[i
] == data
)
221 if (data
== NULL
) return(-1);
222 /* This (and the "qsort" below) are the two places in OpenSSL
223 * where we need to convert from our standard (type **,type **)
224 * compare callback type to the (void *,void *) type required by
225 * bsearch. However, the "data" it is being called(back) with are
226 * not (type *) pointers, but the *pointers* to (type *) pointers,
227 * so we get our extra level of pointer dereferencing that way. */
228 comp_func
=(int (*)(const void *,const void *))(st
->comp
);
229 r
=(char **)bsearch(&data
,(char *)st
->data
,
230 st
->num
,sizeof(char *), comp_func
);
231 if (r
== NULL
) return(-1);
234 /* This needs a cast because the type being pointed to from
235 * the "&" expressions are (char *) rather than (const char *).
236 * For an explanation, read:
237 * http://www.eskimo.com/~scs/C-faq/q11.10.html :-) */
238 if ((*st
->comp
)((const char * const *)&(st
->data
[i
-1]),
239 (const char * const *)&data
) < 0)
244 int sk_push(STACK
*st
, char *data
)
246 return(sk_insert(st
,data
,st
->num
));
249 int sk_unshift(STACK
*st
, char *data
)
251 return(sk_insert(st
,data
,0));
254 char *sk_shift(STACK
*st
)
256 if (st
== NULL
) return(NULL
);
257 if (st
->num
<= 0) return(NULL
);
258 return(sk_delete(st
,0));
261 char *sk_pop(STACK
*st
)
263 if (st
== NULL
) return(NULL
);
264 if (st
->num
<= 0) return(NULL
);
265 return(sk_delete(st
,st
->num
-1));
268 void sk_zero(STACK
*st
)
270 if (st
== NULL
) return;
271 if (st
->num
<= 0) return;
272 memset((char *)st
->data
,0,sizeof(st
->data
)*st
->num
);
276 void sk_pop_free(STACK
*st
, void (*func
)(void *))
280 if (st
== NULL
) return;
281 for (i
=0; i
<st
->num
; i
++)
282 if (st
->data
[i
] != NULL
)
287 void sk_free(STACK
*st
)
289 if (st
== NULL
) return;
290 if (st
->data
!= NULL
) OPENSSL_free(st
->data
);
294 int sk_num(const STACK
*st
)
296 if(st
== NULL
) return -1;
300 char *sk_value(const STACK
*st
, int i
)
302 if(st
== NULL
) return NULL
;
306 char *sk_set(STACK
*st
, int i
, char *value
)
308 if(st
== NULL
) return NULL
;
309 return (st
->data
[i
] = value
);
312 void sk_sort(STACK
*st
)
316 int (*comp_func
)(const void *,const void *);
318 /* same comment as in sk_find ... previously st->comp was declared
319 * as a (void*,void*) callback type, but this made the population
320 * of the callback pointer illogical - our callbacks compare
321 * type** with type**, so we leave the casting until absolutely
322 * necessary (ie. "now"). */
323 comp_func
=(int (*)(const void *,const void *))(st
->comp
);
324 qsort(st
->data
,st
->num
,sizeof(char *), comp_func
);