2 This file is part of GNUnet
3 Copyright (C) 2012 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
16 * @file src/regex/regex_test_random.c
17 * @brief functions for creating random regular expressions and strings
18 * @author Maximilian Szengel
21 #include "regex_test_lib.h"
22 #include "gnunet_crypto_lib.h"
23 #include "regex_internal.h"
27 * Get a (pseudo) random valid literal for building a regular expression.
29 * @return random valid literal
37 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
38 (uint32_t) strlen (ALLOWED_LITERALS));
40 return ALLOWED_LITERALS[ridx];
45 * Generate a (pseudo) random regular expression of length 'rx_length', as well
46 * as a (optional) string that will be matched by the generated regex. The
47 * returned regex needs to be freed.
49 * @param rx_length length of the random regex.
50 * @param matching_str (optional) pointer to a string that will contain a string
51 * that will be matched by the generated regex, if
52 * 'matching_str' pointer was not NULL. Make sure you
53 * allocated at least rx_length+1 bytes for this sting.
55 * @return NULL if 'rx_length' is 0, a random regex of length 'rx_length', which
56 * needs to be freed, otherwise.
59 REGEX_TEST_generate_random_regex (size_t rx_length, char *matching_str)
65 unsigned int char_op_switch;
66 unsigned int last_was_op;
73 if (NULL != matching_str)
74 matching_strp = matching_str;
78 rx = GNUNET_malloc (rx_length + 1);
83 for (i = 0; i < rx_length; i++)
85 char_op_switch = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 2);
87 if (0 == char_op_switch && !last_was_op)
90 rx_op = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 4);
104 if (i < rx_length - 1) /* '|' cannot be at the end */
107 current_char = get_random_literal ();
113 current_char = get_random_literal ();
117 if (NULL != matching_strp &&
118 (current_char != '+' && current_char != '*' && current_char != '?' &&
119 current_char != '|'))
121 *matching_strp = current_char;
125 *rx_p = current_char;
129 if (NULL != matching_strp)
130 *matching_strp = '\0';
137 * Generate a random string of maximum length 'max_len' that only contains literals allowed
138 * in a regular expression. The string might be 0 chars long but is garantueed
139 * to be shorter or equal to 'max_len'.
141 * @param max_len maximum length of the string that should be generated.
143 * @return random string that needs to be freed.
146 REGEX_TEST_generate_random_string (size_t max_len)
153 return GNUNET_strdup ("");
155 len = (size_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, max_len);
156 str = GNUNET_malloc (len + 1);
158 for (i = 0; i < len; i++)
160 str[i] = get_random_literal ();