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("$Id$");
  36
  37 krb5_error_code
  38 store_string(krb5_storage *sp, const char *str)
  39 {
  40     size_t len = strlen(str) + 1;
  41     krb5_error_code ret;
  42
  43     ret = krb5_store_int32(sp, len);
  44     if (ret)
  45         return ret;
  46     ret = krb5_storage_write(sp, str, len);
  47     if (ret != len)
  48         return EINVAL;
  49     return 0;
  50 }
  51
  52 static void
  53 add_list(char ****list, size_t *listlen, char **str, size_t len)
  54 {
  55     size_t i;
  56     *list = erealloc(*list, sizeof(**list) * (*listlen + 1));
  57
  58     (*list)[*listlen] = ecalloc(len, sizeof(**list));
  59     for (i = 0; i < len; i++)
  60         (*list)[*listlen][i] = str[i];
  61     (*listlen)++;
  62 }
  63
  64 static void
  65 permute(char ****list, size_t *listlen,
  66         char **str, const int start, const int len)
  67 {
  68     int i, j;
  69
  70 #define SWAP(s,i,j) { char *t = str[i]; str[i] = str[j]; str[j] = t; }
  71
  72     for (i = start; i < len - 1; i++) {
  73         for (j = i+1; j < len; j++) {
  74             SWAP(str,i,j);
  75             permute(list, listlen, str, i+1, len);
  76             SWAP(str,i,j);
  77         }
  78     }
  79     add_list(list, listlen, str, len);
  80 }
  81
  82 char ***
  83 permutate_all(struct getarg_strings *strings, size_t *size)
  84 {
  85     char **list, ***all = NULL;
  86     int i;
  87
  88     *size = 0;
  89
  90     list = ecalloc(strings->num_strings, sizeof(*list));
  91     for (i = 0; i < strings->num_strings; i++)
  92         list[i] = strings->strings[i];
  93
  94     permute(&all, size, list, 0, strings->num_strings);
  95     free(list);
  96     return all;
  97 }