1 | /* mr_conf.c |
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2 | * |
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3 | * $Id$ |
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4 | * |
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5 | * Based on the work done by Anton (c)2002-2004 Anton Kulchitsky mailto:anton@kulchitsky.org |
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6 | * Code (c)2006 Bruno Cornec <bruno@mondorescue.org> |
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7 | * |
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8 | * Main file of mr_conf : a very small and simple |
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9 | * library for configuration file reading |
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10 | * |
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11 | * Provided under the GPLv2 |
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12 | */ |
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13 | |
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14 | |
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15 | #include <stdlib.h> |
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16 | #include <stdio.h> |
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17 | #include <string.h> |
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18 | |
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19 | #include "mr_msg.h" |
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20 | #include "mr_mem.h" |
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21 | #include "mr_gettext.h" |
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22 | |
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23 | /* error flags */ |
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24 | #define MRCONF_NO_ERROR 0x0 |
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25 | #define MRCONF_BAD_FILE 0x1 |
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26 | #define MRCONF_ALLOC_FAILED 0x2 |
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27 | #define MRCONF_READING_FAILED 0x3 |
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28 | #define MRCONF_NO_GROUP_START 0x4 |
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29 | #define MRCONF_NO_GROUP_END 0x5 |
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30 | #define MRCONF_FIELD_NOT_FOUND 0x6 |
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31 | #define MRCONF_FIELD_NO_VALUE 0x7 |
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32 | #define MRCONF_TOO_LONG_STRING 0x8 |
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33 | #define MRCONF_CLOSE_BUT_NOT_OPEN 0x9 |
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34 | #define MRCONF_OPEN_OPENED 0xA |
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35 | #define MRCONF_CALL_BUT_NOT_OPEN 0xB |
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36 | #define MRCONF_STRING_QUOTE 0xC |
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37 | |
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38 | /*setting flags*/ |
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39 | #define MRCONF_FLAG_VERBOSE 0x1 |
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40 | |
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41 | /*All strings of the library are here*/ |
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42 | #define MRCONF_STR_ERROR _("MRCONF: Error:") |
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43 | #define MRCONF_STR_WARNING _("MRCONF: Warning:") |
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44 | |
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45 | #define MRCONF_STR_BAD_FILE _("cannot open the file: ") |
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46 | #define MRCONF_STR_ALLOC_FAILED _("cannot allocate the memory") |
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47 | #define MRCONF_STR_READING_FAILED _("cannot read file into buffer") |
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48 | #define MRCONF_STR_DEFAULT_ERROR _("default") |
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49 | #define MRCONF_STR_FIELD_NOT_FOUND _("the field is not found, field:") |
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50 | #define MRCONF_STR_FIELD_NO_VALUE _("the field :") |
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51 | #define MRCONF_STR_OPEN_OPENED _("attempt to open mr_conf, but it is opened: aborted") |
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52 | #define MRCONF_STR_HALT _("MRCONF: Error occured: immidiate halt") |
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53 | |
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54 | /*warnings*/ |
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55 | #define MRCONF_STR_SET_TO_ZERO _("variable will be set to 0") |
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56 | #define MRCONF_STR_IGNORE _("has no value, ignoring it") |
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57 | #define MRCONF_STR_CLOSE_BUT_NOT_OPEN _("attempt to close mr_conf but it has not been opened yet") |
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58 | #define MRCONF_STR_CALL_BUT_NOT_OPEN _("attempt to use mr_conf when it has not been opened yet") |
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59 | #define MRCONF_STR_STRING_QUOTE _("string should be surrounded by quotes") |
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60 | |
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61 | /*Flags of internal state*/ |
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62 | #define MRCONF_INTFLAG_OPEN 0x1 /*set if memory allocated */ |
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63 | |
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64 | /* Character for comments */ |
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65 | #define MRCONF_COMM_CHAR '#' |
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66 | |
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67 | /*"private" members declarations*/ |
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68 | static size_t mr_conf_filesize(const char *name); |
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69 | static void mr_conf_error_msg(int error_code, const char *add_line); |
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70 | static void mr_conf_remove_comments(void); |
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71 | static int mr_conf_check_int_flag(const int flag); |
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72 | static void mr_conf_set_int_flag(const int flag); |
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73 | static void mr_conf_drop_int_flag(const int flag); |
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74 | |
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75 | /*global "private" variables*/ |
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76 | static char *buffer = NULL; /*buffer for configuration file */ |
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77 | static int internal_flags = 0; /*state of the module */ |
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78 | static FILE *CONF = NULL; /* Configuration file FD */ |
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79 | |
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80 | /*if output all error and warning messages*/ |
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81 | static int mr_conf_flags = MRCONF_FLAG_VERBOSE; |
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82 | |
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83 | /* |
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84 | * Format of the configuration file is as follows: |
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85 | * |
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86 | * attribute1 = int_value |
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87 | * attribute2 = float_value |
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88 | * attribute3 = string_value |
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89 | */ |
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90 | |
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91 | |
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92 | /*open and read file: each call must be coupled with mr_conf_close |
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93 | function: return 0 if success*/ |
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94 | int mr_conf_open(const char *filename) { |
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95 | size_t length; /*length of the buffer/file */ |
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96 | size_t res = 0; |
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97 | |
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98 | /* check if mr_conf is already opened? */ |
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99 | if (mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) { |
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100 | mr_conf_error_msg(MRCONF_OPEN_OPENED, NULL); |
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101 | return MRCONF_OPEN_OPENED; |
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102 | } |
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103 | |
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104 | length = mr_conf_filesize(filename); |
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105 | CONF = fopen(filename, "r"); |
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106 | |
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107 | /*if file is empty or not exist => error */ |
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108 | if (length == 0) { |
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109 | mr_conf_error_msg(MRCONF_BAD_FILE, filename); |
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110 | return (MRCONF_BAD_FILE); |
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111 | } |
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112 | |
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113 | /*creating and reading buffer for file content */ |
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114 | |
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115 | /*allocate memory for the buffers */ |
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116 | buffer = (char *) mr_malloc(sizeof(char) * (length + 1)); |
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117 | |
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118 | if (buffer == NULL) { |
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119 | mr_conf_error_msg(MRCONF_ALLOC_FAILED, ""); |
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120 | return (MRCONF_ALLOC_FAILED); |
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121 | } |
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122 | |
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123 | /*set flag that module is in "open" state */ |
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124 | mr_conf_set_int_flag(MRCONF_INTFLAG_OPEN); |
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125 | |
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126 | /*reading file in buffer (skip all 0 characters) */ |
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127 | |
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128 | res = fread(buffer, sizeof(char), length, CONF); |
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129 | buffer[length] = (char) 0; /*finalize the string */ |
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130 | |
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131 | if (ferror(CONF)) { |
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132 | mr_conf_error_msg(MRCONF_READING_FAILED, ""); |
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133 | return (MRCONF_READING_FAILED); |
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134 | } |
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135 | |
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136 | /* finally we have to remove all comment lines */ |
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137 | mr_conf_remove_comments(); |
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138 | |
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139 | return MRCONF_NO_ERROR; |
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140 | } |
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141 | |
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142 | /*release all memory and prepare to the next possiable config file*/ |
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143 | void mr_conf_close(void) { |
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144 | /* if not opened => error */ |
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145 | if (!mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) { |
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146 | mr_conf_error_msg(MRCONF_CLOSE_BUT_NOT_OPEN, NULL); |
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147 | } |
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148 | mr_free(buffer); |
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149 | fclose(CONF); |
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150 | |
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151 | /*set flag that module is in "close" state */ |
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152 | mr_conf_drop_int_flag(MRCONF_INTFLAG_OPEN); |
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153 | } |
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154 | |
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155 | /*read field value after string str in the current file*/ |
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156 | static char *mr_conf_read(const char *field_name) { |
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157 | char *p = NULL; /*pointer to the field */ |
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158 | |
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159 | /* check if mr_conf is not yet opened? */ |
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160 | if (!mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) { |
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161 | mr_conf_error_msg(MRCONF_CALL_BUT_NOT_OPEN, NULL); |
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162 | return NULL; |
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163 | } |
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164 | |
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165 | /*read the number */ |
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166 | p = strstr(buffer, field_name); |
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167 | if (p == NULL) { |
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168 | mr_conf_error_msg(MRCONF_FIELD_NOT_FOUND, field_name); |
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169 | return NULL; |
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170 | } else { |
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171 | p += strlen(field_name); |
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172 | while ((*p != '\n') && (*p != '\0') && (*p != '=')) { |
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173 | p++; |
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174 | } |
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175 | if (*p != '=') { |
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176 | mr_conf_error_msg(MRCONF_FIELD_NO_VALUE, field_name); |
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177 | return NULL; |
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178 | } else { |
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179 | /* points after the = sign */ |
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180 | p++; |
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181 | } |
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182 | } |
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183 | /* skip initial spaces and tabs after = */ |
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184 | while ((*p == ' ') || (*p == '\t')) { |
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185 | p++; |
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186 | } |
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187 | |
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188 | return p; |
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189 | } |
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190 | |
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191 | /*read integer number after string str in the current file*/ |
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192 | int mr_conf_iread(const char *field_name) { |
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193 | char *p = NULL; /*pointer to the field */ |
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194 | int ret = 0; /*return value */ |
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195 | |
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196 | p = mr_conf_read(field_name); |
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197 | if (p != NULL) { |
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198 | ret = atoi(p); |
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199 | } |
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200 | return ret; |
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201 | } |
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202 | |
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203 | /*read float/double number after string str in the current file*/ |
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204 | double mr_conf_fread(const char *field_name) { |
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205 | char *p = NULL; /*pointer to the field */ |
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206 | double ret = 0.0; /*return value */ |
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207 | |
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208 | p = mr_conf_read(field_name); |
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209 | if (p != NULL) { |
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210 | ret = atof(p); |
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211 | } |
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212 | return ret; |
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213 | } |
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214 | |
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215 | /* |
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216 | reads string outstr after string str in the current file (between |
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217 | "..."), not more than maxlength symbols: cannot check if outstr has |
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218 | enough length! It must be at least maxlength+1 ! Returns number of |
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219 | read chars |
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220 | */ |
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221 | char *mr_conf_sread(const char *field_name) { |
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222 | char *p = NULL; /*pointer to the field */ |
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223 | char *q = NULL; /*pointer to the field */ |
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224 | char *r = NULL; /*pointer to the field */ |
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225 | char *ret = NULL; /*return value */ |
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226 | int size = 0; /*size of returned string */ |
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227 | int i = 0; |
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228 | |
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229 | ret = NULL; |
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230 | |
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231 | p = mr_conf_read(field_name); |
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232 | if (p == NULL) { |
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233 | return(p); |
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234 | } |
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235 | mr_asprintf(&q, p); |
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236 | |
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237 | if (*p != '"') { |
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238 | mr_conf_error_msg(MRCONF_STRING_QUOTE, ""); |
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239 | return (NULL); |
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240 | } |
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241 | p++; |
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242 | |
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243 | /* trunk at first \n */ |
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244 | r = index(q,'\n'); |
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245 | r--; |
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246 | if (*r != '"') { |
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247 | mr_conf_error_msg(MRCONF_STRING_QUOTE, ""); |
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248 | return (NULL); |
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249 | } |
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250 | r--; |
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251 | |
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252 | size = r-q+1; |
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253 | /*copy filtered data to the buffer */ |
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254 | ret = (char *) mr_malloc(sizeof(char) * (size)); |
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255 | if (ret == NULL) { |
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256 | mr_conf_error_msg(MRCONF_ALLOC_FAILED, ""); |
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257 | return (NULL); |
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258 | } |
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259 | while (i < size - 1) { |
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260 | ret[i] = *p; |
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261 | i++; |
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262 | p++; |
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263 | } |
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264 | |
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265 | ret[i] = (char) 0; /* and set its length */ |
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266 | mr_free(q); |
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267 | |
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268 | return ret; |
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269 | } |
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270 | |
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271 | /*removes all comments from the buffer*/ |
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272 | static void mr_conf_remove_comments() { |
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273 | char *tmp_buf; /*temporary buffer without comments */ |
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274 | size_t length /*initial length */ ; |
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275 | size_t i; /*iterator */ |
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276 | size_t k; /*conditioned iterator for tmp_buffer */ |
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277 | |
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278 | length = strlen(buffer); |
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279 | |
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280 | /*sizing the new chain */ |
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281 | k = 0; |
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282 | i = 0; |
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283 | while (i < length) { |
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284 | if (buffer[i] != MRCONF_COMM_CHAR) { |
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285 | k++; |
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286 | i++; |
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287 | } else { |
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288 | while ((buffer[i] != '\n') && (buffer[i] != (char) 0)) { |
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289 | i++; |
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290 | } |
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291 | } |
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292 | } |
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293 | /* k is new buffer length now */ |
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294 | tmp_buf = (char *) mr_malloc(sizeof(char) * (k + 1)); |
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295 | if (tmp_buf == NULL) { |
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296 | mr_conf_error_msg(MRCONF_ALLOC_FAILED, ""); |
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297 | return; |
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298 | } |
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299 | |
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300 | k = 0; |
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301 | i = 0; |
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302 | while (i < length) { |
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303 | if (buffer[i] != MRCONF_COMM_CHAR) { |
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304 | tmp_buf[k++] = buffer[i++]; |
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305 | } else { |
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306 | while ((buffer[i] != '\n') && (buffer[i] != (char) 0)) { |
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307 | i++; |
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308 | } |
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309 | } |
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310 | } |
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311 | tmp_buf[k] = (char) 0; /*and set its length */ |
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312 | |
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313 | mr_free(buffer); |
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314 | /*copy filtered data to the buffer */ |
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315 | buffer = tmp_buf; |
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316 | } |
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317 | |
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318 | static int mr_conf_check_int_flag(const int flag) { |
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319 | return (flag & internal_flags); |
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320 | } |
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321 | |
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322 | static void mr_conf_set_int_flag(const int flag) { |
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323 | internal_flags = flag | internal_flags; |
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324 | } |
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325 | |
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326 | static void mr_conf_drop_int_flag(const int flag) { |
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327 | internal_flags = (~flag) & internal_flags; |
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328 | } |
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329 | |
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330 | |
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331 | /*local function to define size of a file. Return 0 for mistake*/ |
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332 | static size_t mr_conf_filesize(const char *name) { |
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333 | FILE *F = fopen(name, "r"); /*file to open */ |
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334 | size_t length; /*number to return */ |
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335 | |
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336 | if (F == NULL) { |
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337 | return 0; |
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338 | } |
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339 | |
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340 | fseek(F, 0, SEEK_END); /*set position to the end of file */ |
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341 | length = ftell(F); /*define number of position=> this is its |
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342 | length */ |
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343 | fclose(F); |
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344 | |
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345 | return length; |
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346 | } |
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347 | |
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348 | /*output error message*/ |
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349 | static void mr_conf_error_msg(int error_code, const char *add_line) { |
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350 | if ((mr_conf_flags & MRCONF_FLAG_VERBOSE)) { /*if verbose mode */ |
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351 | switch (error_code) { |
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352 | case MRCONF_BAD_FILE: |
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353 | mr_msg(0,"%s %s %s\n", MRCONF_STR_ERROR, MRCONF_STR_BAD_FILE, |
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354 | add_line); |
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355 | break; |
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356 | |
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357 | case MRCONF_ALLOC_FAILED: |
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358 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_ALLOC_FAILED); |
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359 | break; |
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360 | |
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361 | case MRCONF_READING_FAILED: |
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362 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_READING_FAILED); |
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363 | break; |
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364 | |
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365 | case MRCONF_FIELD_NOT_FOUND: |
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366 | mr_msg(0,"%s %s \"%s\"\n", MRCONF_STR_ERROR, MRCONF_STR_FIELD_NOT_FOUND, add_line); |
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367 | mr_msg(0,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_SET_TO_ZERO); |
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368 | break; |
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369 | |
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370 | case MRCONF_FIELD_NO_VALUE: |
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371 | mr_msg(0,"%s %s \"%s\"\n", MRCONF_STR_ERROR, MRCONF_STR_FIELD_NO_VALUE, add_line); |
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372 | mr_msg(0,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_IGNORE); |
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373 | break; |
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374 | |
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375 | case MRCONF_CLOSE_BUT_NOT_OPEN: |
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376 | mr_msg(0,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_CLOSE_BUT_NOT_OPEN); |
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377 | break; |
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378 | |
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379 | case MRCONF_CALL_BUT_NOT_OPEN: |
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380 | mr_msg(0,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_CALL_BUT_NOT_OPEN); |
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381 | break; |
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382 | |
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383 | case MRCONF_OPEN_OPENED: |
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384 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_OPEN_OPENED); |
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385 | break; |
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386 | |
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387 | case MRCONF_STRING_QUOTE: |
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388 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_STRING_QUOTE); |
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389 | break; |
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390 | |
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391 | default: |
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392 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_DEFAULT_ERROR); |
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393 | break; |
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394 | } |
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395 | } |
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396 | } |
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