src/regex_parser.c

Wed, 31 May 2017 12:20:04 +0200

author
Mike Becker <universe@uap-core.de>
date
Wed, 31 May 2017 12:20:04 +0200
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parent 36
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child 54
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adds remaining autoconf files

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 * Copyright 2017 Mike Becker. All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions are met:
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7 *
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 *
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *
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26 * regex_parser.c
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27 *
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28 * Created on: 26.01.2012
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29 * Author: Mike
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30 */
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31
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32 #include "regex_parser.h"
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33
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34 regex_parser_t* new_regex_parser_t() {
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35 regex_parser_t* ret = malloc(sizeof(regex_parser_t));
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36 if (ret != NULL) {
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37 ret->pattern_list = new_string_list_t();
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38 ret->matched_lines = 0;
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39 ret->pattern_match = 0;
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40 ret->compiled_patterns = NULL;
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41 ret->compiled_pattern_count = 0;
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42 }
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43 return ret;
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44 }
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45
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46 void regex_destcomppats(regex_parser_t* parser) {
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47 if (parser->compiled_patterns != NULL) {
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48 for (int i = 0 ; i < parser->compiled_pattern_count ; i++) {
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49 if (parser->compiled_patterns[i] != NULL) {
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50 free(parser->compiled_patterns[i]);
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51 }
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52 }
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53 free(parser->compiled_patterns);
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54 parser->compiled_patterns = NULL;
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55 parser->compiled_pattern_count = 0;
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56 }
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57 }
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58
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59 void destroy_regex_parser_t(regex_parser_t* parser) {
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60 regex_destcomppats(parser);
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61 destroy_string_list_t(parser->pattern_list);
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62 free(parser);
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63 }
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64
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65 bool regex_parser_matching(regex_parser_t* parser) {
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66 return parser->pattern_match > 0;
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67 }
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68
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69 int regex_parser_do(regex_parser_t* parser, char* input) {
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70 int err = REG_NOMATCH;
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71 if (parser->compiled_pattern_count > 0) {
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72 regmatch_t match;
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73
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74 if (regex_parser_matching(parser)) {
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75 parser->matched_lines++;
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77 err = regexec(parser->compiled_patterns[parser->pattern_match],
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78 input, 1, &match, 0);
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79 if (err > 0 && err != REG_NOMATCH) {
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80 fprintf(stderr, "Regex-Error: 0x%08x", err);
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81 }
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82 if (err == 0) {
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83 parser->pattern_match = 0;
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84 /* do not match line, if it does not end with the pattern */
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85 if (match.rm_eo < strlen(input)) {
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86 parser->matched_lines--;
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87 }
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88 }
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89 } else {
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90 for (int i = 0 ; i < parser->compiled_pattern_count - 1 ; i += 2) {
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91 err = regexec(parser->compiled_patterns[i], input, 1, &match, 0);
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92 if (err > 0 && err != REG_NOMATCH) {
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93 fprintf(stderr, "Regex-Error: 0x%08x", err);
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94 }
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95 if (err == 0) {
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96 parser->pattern_match = i+1;
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97 parser->matched_lines = 0;
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98 /* Check, if end pattern is also in this line */
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99 regex_parser_do(parser, input);
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100 /* do not match line, if it does not start with the pattern */
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101 if (match.rm_so > 0 && parser->matched_lines > 0) {
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102 parser->matched_lines--;
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103 }
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104 break;
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105 }
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106 }
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107 }
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108 }
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109 return err;
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110 }
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111
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112 bool regex_compile_all(regex_parser_t* parser) {
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113 bool success = true;
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114 size_t pcount = parser->pattern_list->count;
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115 if (pcount > 0) {
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116 regex_destcomppats(parser);
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117 parser->compiled_patterns = calloc(pcount, sizeof(regex_t));
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118 parser->compiled_pattern_count = pcount;
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119
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120 regex_t* re;
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121 for (int i = 0 ; i < pcount ; i++) {
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122 re = malloc(sizeof(regex_t));
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123 if (regcomp(re, parser->pattern_list->items[i], REG_EXTENDED) == 0) {
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124 parser->compiled_patterns[i] = re;
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125 } else {
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126 fprintf(stderr, "Cannot compile pattern: %s\n",
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127 (parser->pattern_list->items[i]));
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128 parser->compiled_patterns[i] = NULL;
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129 success = false;
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130 }
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131 }
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132 }
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133 return success;
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134 }

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