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19 * @file src/regex/regex_test_random.c
20 * @brief functions for creating random regular expressions and strings
21 * @author Maximilian Szengel
24 #include "regex_test_lib.h"
25 #include "gnunet_crypto_lib.h"
26 #include "regex_internal.h"
30 * Get a (pseudo) random valid literal for building a regular expression.
32 * @return random valid literal
40 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
41 (uint32_t) strlen (ALLOWED_LITERALS));
43 return ALLOWED_LITERALS[ridx];
48 * Generate a (pseudo) random regular expression of length 'rx_length', as well
49 * as a (optional) string that will be matched by the generated regex. The
50 * returned regex needs to be freed.
52 * @param rx_length length of the random regex.
53 * @param matching_str (optional) pointer to a string that will contain a string
54 * that will be matched by the generated regex, if
55 * 'matching_str' pointer was not NULL. Make sure you
56 * allocated at least rx_length+1 bytes for this sting.
58 * @return NULL if 'rx_length' is 0, a random regex of length 'rx_length', which
59 * needs to be freed, otherwise.
62 REGEX_TEST_generate_random_regex (size_t rx_length, char *matching_str)
68 unsigned int char_op_switch;
69 unsigned int last_was_op;
76 if (NULL != matching_str)
77 matching_strp = matching_str;
81 rx = GNUNET_malloc (rx_length + 1);
86 for (i = 0; i < rx_length; i++)
88 char_op_switch = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 2);
90 if (0 == char_op_switch && !last_was_op)
93 rx_op = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 4);
107 if (i < rx_length - 1) /* '|' cannot be at the end */
110 current_char = get_random_literal ();
116 current_char = get_random_literal ();
120 if (NULL != matching_strp &&
121 (current_char != '+' && current_char != '*' && current_char != '?' &&
122 current_char != '|'))
124 *matching_strp = current_char;
128 *rx_p = current_char;
132 if (NULL != matching_strp)
133 *matching_strp = '\0';
140 * Generate a random string of maximum length 'max_len' that only contains literals allowed
141 * in a regular expression. The string might be 0 chars long but is garantueed
142 * to be shorter or equal to 'max_len'.
144 * @param max_len maximum length of the string that should be generated.
146 * @return random string that needs to be freed.
149 REGEX_TEST_generate_random_string (size_t max_len)
156 return GNUNET_strdup ("");
158 len = (size_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, max_len);
159 str = GNUNET_malloc (len + 1);
161 for (i = 0; i < len; i++)
163 str[i] = get_random_literal ();