crypto/dist/heimdal/appl/gssmask/common.c

   1 /*
   2  * Copyright (c) 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of KTH nor the names of its contributors may be
  18  *    used to endorse or promote products derived from this software without
  19  *    specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
  22  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  24  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <common.h>
  35 __RCSID("$Heimdal: common.c 18900 2006-11-03 05:21:01Z lha $"
  36         "$NetBSD$");
  37
  38 krb5_error_code
  39 store_string(krb5_storage *sp, const char *str)
  40 {
  41     size_t len = strlen(str) + 1;
  42     krb5_error_code ret;
  43
  44     ret = krb5_store_int32(sp, len);
  45     if (ret)
  46         return ret;
  47     ret = krb5_storage_write(sp, str, len);
  48     if (ret != len)
  49         return EINVAL;
  50     return 0;
  51 }
  52
  53 static void
  54 add_list(char ****list, size_t *listlen, char **str, size_t len)
  55 {
  56     size_t i;
  57     *list = erealloc(*list, sizeof(**list) * (*listlen + 1));
  58
  59     (*list)[*listlen] = ecalloc(len, sizeof(**list));
  60     for (i = 0; i < len; i++)
  61         (*list)[*listlen][i] = str[i];
  62     (*listlen)++;
  63 }
  64
  65 static void
  66 permute(char ****list, size_t *listlen,
  67         char **str, const int start, const int len)
  68 {
  69     int i, j;
  70
  71 #define SWAP(s,i,j) { char *t = str[i]; str[i] = str[j]; str[j] = t; }
  72
  73     for (i = start; i < len - 1; i++) {
  74         for (j = i+1; j < len; j++) {
  75             SWAP(str,i,j);
  76             permute(list, listlen, str, i+1, len);
  77             SWAP(str,i,j);
  78         }
  79     }
  80     add_list(list, listlen, str, len);
  81 }
  82
  83 char ***
  84 permutate_all(struct getarg_strings *strings, size_t *size)
  85 {
  86     char **list, ***all = NULL;
  87     int i;
  88
  89     *size = 0;
  90
  91     list = ecalloc(strings->num_strings, sizeof(*list));
  92     for (i = 0; i < strings->num_strings; i++)
  93         list[i] = strings->strings[i];
  94
  95     permute(&all, size, list, 0, strings->num_strings);
  96     free(list);
  97     return all;
  98 }