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+/* crypto/stack/stack.c */
+/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+/* Code for stacks
+ * Author - Eric Young v 1.0
+ * 1.2 eay 12-Mar-97 - Modified sk_find so that it _DOES_ return the
+ * lowest index for the seached item.
+ *
+ * 1.1 eay - Take from netdb and added to SSLeay
+ *
+ * 1.0 eay - First version 29/07/92
+ */
+#include <stdio.h>
+#include "cryptlib.h"
+#include "stack.h"
+
+#undef MIN_NODES
+#define MIN_NODES 4
+
+char *STACK_version="STACK part of SSLeay 0.8.1b 29-Jun-1998";
+
+#ifndef NOPROTO
+#define FP_ICC (int (*)(const void *,const void *))
+#else
+#define FP_ICC
+#endif
+
+#include <errno.h>
+
+void sk_set_cmp_func(sk,c)
+STACK *sk;
+int (*c)();
+ {
+ if (sk->comp != c)
+ sk->sorted=0;
+ sk->comp=c;
+ }
+
+STACK *sk_dup(sk)
+STACK *sk;
+ {
+ STACK *ret;
+ char **s;
+
+ if ((ret=sk_new(sk->comp)) == NULL) goto err;
+ s=(char **)Realloc((char *)ret->data,
+ (unsigned int)sizeof(char *)*sk->num_alloc);
+ if (s == NULL) goto err;
+ ret->data=s;
+
+ ret->num=sk->num;
+ memcpy(ret->data,sk->data,sizeof(char *)*sk->num);
+ ret->sorted=sk->sorted;
+ ret->num_alloc=sk->num_alloc;
+ ret->comp=sk->comp;
+ return(ret);
+err:
+ return(NULL);
+ }
+
+STACK *sk_new(c)
+int (*c)();
+ {
+ STACK *ret;
+ int i;
+
+ if ((ret=(STACK *)Malloc(sizeof(STACK))) == NULL)
+ goto err0;
+ if ((ret->data=(char **)Malloc(sizeof(char *)*MIN_NODES)) == NULL)
+ goto err1;
+ for (i=0; i<MIN_NODES; i++)
+ ret->data[i]=NULL;
+ ret->comp=c;
+ ret->num_alloc=MIN_NODES;
+ ret->num=0;
+ ret->sorted=0;
+ return(ret);
+err1:
+ Free((char *)ret);
+err0:
+ return(NULL);
+ }
+
+int sk_insert(st,data,loc)
+STACK *st;
+char *data;
+int loc;
+ {
+ char **s;
+
+ if (st->num_alloc <= st->num+1)
+ {
+ s=(char **)Realloc((char *)st->data,
+ (unsigned int)sizeof(char *)*st->num_alloc*2);
+ if (s == NULL)
+ return(0);
+ st->data=s;
+ st->num_alloc*=2;
+ }
+ if ((loc >= (int)st->num) || (loc < 0))
+ st->data[st->num]=data;
+ else
+ {
+ int i;
+ char **f,**t;
+
+ f=(char **)st->data;
+ t=(char **)&(st->data[1]);
+ for (i=st->num; i>loc; i--)
+ t[i]=f[i];
+
+#ifdef undef /* no memmove on sunos :-( */
+ memmove( (char *)&(st->data[loc+1]),
+ (char *)&(st->data[loc]),
+ sizeof(char *)*(st->num-loc));
+#endif
+ st->data[loc]=data;
+ }
+ st->num++;
+ st->sorted=0;
+ return(st->num);
+ }
+
+char *sk_delete_ptr(st,p)
+STACK *st;
+char *p;
+ {
+ int i;
+
+ for (i=0; i<st->num; i++)
+ if (st->data[i] == p)
+ return(sk_delete(st,i));
+ return(NULL);
+ }
+
+char *sk_delete(st,loc)
+STACK *st;
+int loc;
+ {
+ char *ret;
+
+ if ((st->num == 0) || (loc < 0) || (loc >= st->num)) return(NULL);
+
+ ret=st->data[loc];
+ if (loc != st->num-1)
+ memcpy( &(st->data[loc]),
+ &(st->data[loc+1]),
+ sizeof(char *)*(st->num-loc-1));
+ st->num--;
+ return(ret);
+ }
+
+int sk_find(st,data)
+STACK *st;
+char *data;
+ {
+ char **r;
+ int i;
+ int (*comp_func)();
+
+ if (st->comp == NULL)
+ {
+ for (i=0; i<st->num; i++)
+ if (st->data[i] == data)
+ return(i);
+ return(-1);
+ }
+ comp_func=(int (*)())st->comp;
+ if (!st->sorted)
+ {
+ qsort((char *)st->data,st->num,sizeof(char *),FP_ICC comp_func);
+ st->sorted=1;
+ }
+ if (data == NULL) return(-1);
+ r=(char **)bsearch(&data,(char *)st->data,
+ st->num,sizeof(char *),FP_ICC comp_func);
+ if (r == NULL) return(-1);
+ i=(int)(r-st->data);
+ for ( ; i>0; i--)
+ if ((*st->comp)(&(st->data[i-1]),&data) < 0)
+ break;
+ return(i);
+ }
+
+int sk_push(st,data)
+STACK *st;
+char *data;
+ {
+ return(sk_insert(st,data,st->num));
+ }
+
+int sk_unshift(st,data)
+STACK *st;
+char *data;
+ {
+ return(sk_insert(st,data,0));
+ }
+
+char *sk_shift(st)
+STACK *st;
+ {
+ if (st == NULL) return(NULL);
+ if (st->num <= 0) return(NULL);
+ return(sk_delete(st,0));
+ }
+
+char *sk_pop(st)
+STACK *st;
+ {
+ if (st == NULL) return(NULL);
+ if (st->num <= 0) return(NULL);
+ return(sk_delete(st,st->num-1));
+ }
+
+void sk_zero(st)
+STACK *st;
+ {
+ if (st == NULL) return;
+ if (st->num <= 0) return;
+ memset((char *)st->data,0,sizeof(st->data)*st->num);
+ st->num=0;
+ }
+
+void sk_pop_free(st,func)
+STACK *st;
+void (*func)();
+ {
+ int i;
+
+ if (st == NULL) return;
+ for (i=0; i<st->num; i++)
+ if (st->data[i] != NULL)
+ func(st->data[i]);
+ sk_free(st);
+ }
+
+void sk_free(st)
+STACK *st;
+ {
+ if (st == NULL) return;
+ if (st->data != NULL) Free((char *)st->data);
+ Free((char *)st);
+ }
+
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