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_types.h"
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20 | #include "mr_msg.h"
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21 | #include "mr_mem.h"
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22 | #include "mr_gettext.h"
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23 |
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24 | /* error flags */
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25 | #define MRCONF_NO_ERROR 0x0
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26 | #define MRCONF_BAD_FILE 0x1
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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 | #define MRCONF_STRING_ENDQUOTE 0xD
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38 |
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39 | /*setting flags*/
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40 | #define MRCONF_FLAG_VERBOSE 0x1
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41 |
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42 | /*All strings of the library are here*/
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43 | #define MRCONF_STR_ERROR _("MRCONF: Error:")
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44 | #define MRCONF_STR_WARNING _("MRCONF: Warning:")
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45 |
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46 | #define MRCONF_STR_BAD_FILE _("cannot open the file: ")
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47 | #define MRCONF_STR_ALLOC_FAILED _("cannot allocate the memory")
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48 | #define MRCONF_STR_READING_FAILED _("cannot read file into buffer")
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49 | #define MRCONF_STR_DEFAULT_ERROR _("default")
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50 | #define MRCONF_STR_FIELD_NOT_FOUND _("the field is not found, field:")
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51 | #define MRCONF_STR_FIELD_NO_VALUE _("the field :")
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52 | #define MRCONF_STR_OPEN_OPENED _("attempt to open mr_conf, but it is opened: aborted")
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53 | #define MRCONF_STR_HALT _("MRCONF: Error occured: immidiate halt")
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54 |
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55 | /*warnings*/
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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 | #define MRCONF_STR_STRING_ENDQUOTE _("a string is not finished by a quote")
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61 |
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62 | /*Flags of internal state*/
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63 | #define MRCONF_INTFLAG_OPEN 0x1 /*set if memory allocated */
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64 |
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65 | /* Character for comments */
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66 | #define MRCONF_COMM_CHAR '#'
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67 |
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68 | /*"private" members declarations*/
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69 | static size_t mr_conf_filesize(const char *name);
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70 | #define mr_conf_error_msg(x, y) {mr_conf_error_msg_int(x, y, __LINE__,__FILE__);}
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71 | static void mr_conf_error_msg_int(int error_code, const char *add_line, int line, const char *file);
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72 | static void mr_conf_remove_comments(void);
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73 | static int mr_conf_check_int_flag(const int flag);
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74 | static void mr_conf_set_int_flag(const int flag);
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75 | static void mr_conf_drop_int_flag(const int flag);
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76 |
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77 | /*global "private" variables*/
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78 | static char *buffer = NULL; /*buffer for configuration file */
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79 | static int internal_flags = 0; /*state of the module */
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80 | static FILE *CONF = NULL; /* Configuration file FD */
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81 | static char *mr_conf_filename = NULL; /* Configuration filename */
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82 |
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83 | /*if output all error and warning messages*/
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84 | static int mr_conf_flags = MRCONF_FLAG_VERBOSE;
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85 |
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86 | /*
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87 | * Format of the configuration file is as follows:
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88 | *
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89 | * attribute1 = int_value
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90 | * attribute2 = float_value
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91 | * attribute3 = string_value
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92 | */
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93 |
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94 |
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95 | /*open and read file: each call must be coupled with mr_conf_close
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96 | function: return 0 if success*/
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97 | int mr_conf_open(const char *filename) {
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98 | size_t length; /*length of the buffer/file */
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99 | size_t res = 0;
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100 |
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101 | /* check if mr_conf is already opened? */
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102 | if (mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) {
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103 | mr_conf_error_msg(MRCONF_OPEN_OPENED, NULL);
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104 | return MRCONF_OPEN_OPENED;
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105 | }
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106 |
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107 | length = mr_conf_filesize(filename);
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108 | CONF = fopen(filename, "r");
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109 |
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110 | mr_asprintf(&mr_conf_filename,filename);
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111 |
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112 | /*if file is empty or not exist => error */
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113 | if (length == 0) {
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114 | mr_conf_error_msg(MRCONF_BAD_FILE, filename);
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115 | return (MRCONF_BAD_FILE);
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116 | }
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117 |
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118 | /*creating and reading buffer for file content */
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119 |
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120 | /*allocate memory for the buffers */
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121 | buffer = (char *) mr_malloc(sizeof(char) * (length + 1));
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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 | mr_free(mr_conf_filename);
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152 |
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153 | /*set flag that module is in "close" state */
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154 | mr_conf_drop_int_flag(MRCONF_INTFLAG_OPEN);
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155 | }
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156 |
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157 | /*read field value after string str in the current file*/
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158 | static char *mr_conf_read(const char *field_name) {
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159 | char *p = NULL; /*pointer to the field */
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160 |
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161 | /* check if mr_conf is not yet opened? */
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162 | if (!mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) {
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163 | mr_conf_error_msg(MRCONF_CALL_BUT_NOT_OPEN, NULL);
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164 | return NULL;
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165 | }
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166 |
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167 | /*read the number */
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168 | p = strstr(buffer, field_name);
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169 | if (p == NULL) {
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170 | mr_conf_error_msg(MRCONF_FIELD_NOT_FOUND, field_name);
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171 | return NULL;
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172 | } else {
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173 | p += strlen(field_name);
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174 | while ((*p != '\n') && (*p != '\0') && (*p != '=')) {
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175 | p++;
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176 | }
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177 | if (*p != '=') {
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178 | mr_conf_error_msg(MRCONF_FIELD_NO_VALUE, field_name);
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179 | return NULL;
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180 | } else {
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181 | /* points after the = sign */
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182 | p++;
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183 | }
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184 | }
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185 | /* skip initial spaces and tabs after = */
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186 | while ((*p == ' ') || (*p == '\t')) {
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187 | p++;
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188 | }
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189 |
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190 | return p;
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191 | }
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192 |
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193 | /*read integer number after string str in the current file*/
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194 | char *mr_conf_iread(const char *field_name) {
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195 | char *p = NULL; /*pointer to the field */
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196 | char *p1 = NULL; /*return field */
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197 |
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198 | p = mr_conf_read(field_name);
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199 | if (p != NULL) {
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200 | mr_asprintf(&p1, "%d", p);
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201 | }
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202 | return p1;
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203 | }
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204 |
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205 | /*read float/double number after string str in the current file*/
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206 | char *mr_conf_fread(const char *field_name) {
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207 | char *p = NULL; /*pointer to the field */
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208 | char *p1 = NULL; /*return field */
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209 |
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210 | p = mr_conf_read(field_name);
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211 | if (p != NULL) {
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212 | mr_asprintf(&p1, "%f", p);
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213 | }
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214 | return p1;
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215 | }
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216 |
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217 |
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218 | /*
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219 | */
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220 | char *mr_conf_sread(const char *field_name) {
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221 | char *p = NULL; /*pointer to the field */
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222 | char *q = NULL; /*pointer to the field */
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223 | char *r = NULL; /*pointer to the field */
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224 | char *ret = NULL; /*return value */
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225 | int size = 0; /*size of returned string */
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226 | int i = 0;
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227 |
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228 | ret = NULL;
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229 |
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230 | p = mr_conf_read(field_name);
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231 | if (p == NULL) {
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232 | return(p);
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233 | }
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234 | mr_asprintf(&q, p);
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235 |
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236 | if (*p != '"') {
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237 | mr_conf_error_msg(MRCONF_STRING_QUOTE, field_name);
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238 | return (NULL);
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239 | }
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240 | p++;
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241 |
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242 | /* trunk at first \n */
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243 | r = index(q,'\n');
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244 | r--;
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245 | if (*r != '"') {
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246 | mr_conf_error_msg(MRCONF_STRING_QUOTE, field_name);
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247 | return (NULL);
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248 | }
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249 | r--;
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250 |
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251 | size = r-q+1;
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252 | /*copy filtered data to the buffer */
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253 | ret = (char *) mr_malloc(sizeof(char) * (size));
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254 | while (i < size - 1) {
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255 | ret[i] = *p;
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256 | i++;
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257 | p++;
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258 | }
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259 |
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260 | ret[i] = (char) 0; /* and set its length */
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261 | mr_free(q);
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262 |
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263 | return ret;
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264 | }
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265 |
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266 | /*read boolean after string str in the current file*/
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267 | char *mr_conf_bread(const char *field_name) {
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268 | char *p = NULL; /*pointer to the field */
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269 | char *p1 = NULL; /*pointer to the field */
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270 |
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271 | p = mr_conf_read(field_name);
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272 | if (p != NULL) {
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273 | /* match if yes/true/1 */
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274 | if ((strncasecmp(p, "y" , (size_t)1) == 0) ||
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275 | (strncasecmp(p, "t" , (size_t)1) == 0) ||
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276 | (strncasecmp(p, "1" , (size_t)1) == 0)) {
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277 | mr_asprintf(&p1, "%d", TRUE);
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278 | } else {
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279 | mr_asprintf(&p1, "%d", FALSE);
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280 | }
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281 | }
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282 | return p1;
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283 | }
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284 |
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285 | /* Convert a string with decimal value of TRUE/FALSE in boolean */
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286 | bool mr_atob(const char *str) {
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287 | bool ret = FALSE;
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288 | char *p = NULL;
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289 |
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290 | mr_asprintf(&p, "%d", FALSE);
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291 | if (strcmp(str,p) != 0) {
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292 | ret = TRUE;
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293 | }
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294 | mr_free(p);
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295 | return(ret);
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296 | }
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297 |
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298 | /*removes all comments from the buffer*/
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299 | static void mr_conf_remove_comments(void) {
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300 | char *tmp_buf; /*temporary buffer without comments */
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301 | size_t length /*initial length */ ;
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302 | size_t i; /*iterator */
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303 | size_t k; /*conditioned iterator for tmp_buffer */
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304 | bool found_quote = FALSE;
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305 | bool found_comment = FALSE;
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306 |
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307 | length = strlen(buffer);
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308 |
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309 | /*sizing the new chain */
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310 | k = 0;
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311 | i = 0;
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312 | while (i < length) {
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313 | /* Handle quotes to detect strings */
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314 | if ((buffer[i] == '"') && (! found_comment)) {
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315 | if (found_quote) {
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316 | found_quote = FALSE;
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317 | } else {
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318 | found_quote = TRUE;
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319 | }
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320 | }
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321 | /* Handle start of comment - only when not in a string */
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322 | if (buffer[i] == MRCONF_COMM_CHAR) {
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323 | if (found_quote) {
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324 | found_comment = FALSE;
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325 | } else {
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326 | found_comment = TRUE;
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327 | }
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328 | }
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329 | /* Comments end with EOL */
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330 | if (buffer[i] == '\n') {
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331 | found_comment = FALSE;
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332 | }
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333 | if (! found_comment) {
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334 | k++;
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335 | i++;
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336 | } else {
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337 | /* Skip comment */
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338 | while ((buffer[i] != '\n') && (buffer[i] != (char) 0)) {
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339 | i++;
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340 | }
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341 | if (buffer[i] == (char) 0) {
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342 | mr_conf_error_msg(MRCONF_STRING_ENDQUOTE, buffer);
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343 | }
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344 | }
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345 | }
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346 | /* k is new buffer length now */
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347 | tmp_buf = (char *) mr_malloc(sizeof(char) * (k + 1));
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348 |
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349 | k = 0;
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350 | i = 0;
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351 | while (i < length) {
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352 | if (buffer[i] == '"') {
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353 | if (found_quote) {
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354 | found_quote = FALSE;
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355 | } else {
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356 | found_quote = TRUE;
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357 | }
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358 | }
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359 | if ((buffer[i] != MRCONF_COMM_CHAR) || (found_quote)) {
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360 | tmp_buf[k++] = buffer[i++];
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361 | } else {
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362 | /* Skip comment as it's not inside a string */
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363 | while ((buffer[i] != '\n') && (buffer[i] != (char) 0)) {
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364 | i++;
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365 | }
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366 | }
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367 | }
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368 | tmp_buf[k] = (char) 0; /*and set its length */
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369 |
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370 | mr_free(buffer);
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371 | /*copy filtered data to the buffer */
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372 | buffer = tmp_buf;
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373 | }
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374 |
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375 | static int mr_conf_check_int_flag(const int flag) {
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376 | return (flag & internal_flags);
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377 | }
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378 |
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379 | static void mr_conf_set_int_flag(const int flag) {
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380 | internal_flags = flag | internal_flags;
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381 | }
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382 |
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383 | static void mr_conf_drop_int_flag(const int flag) {
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384 | internal_flags = (~flag) & internal_flags;
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385 | }
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386 |
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387 |
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388 | /*local function to define size of a file. Return 0 for mistake*/
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389 | static size_t mr_conf_filesize(const char *name) {
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390 | FILE *F = fopen(name, "r"); /*file to open */
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391 | size_t length; /*number to return */
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392 |
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393 | if (F == NULL) {
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394 | return 0;
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395 | }
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396 |
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397 | fseek(F, 0, SEEK_END); /*set position to the end of file */
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398 | length = ftell(F); /*define number of position=> this is its
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399 | length */
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400 | fclose(F);
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401 |
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402 | return length;
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403 | }
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404 |
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405 | /*output error message*/
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406 | static void mr_conf_error_msg_int(int error_code, const char *add_line, int line, const char *file) {
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407 | if ((mr_conf_flags & MRCONF_FLAG_VERBOSE)) { /*if verbose mode */
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408 | switch (error_code) {
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409 | case MRCONF_BAD_FILE:
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410 | mr_msg_int(1,line,file,"%s (%s) %s %s", MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_BAD_FILE,
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411 | add_line);
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412 | break;
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413 |
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414 | case MRCONF_READING_FAILED:
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415 | mr_msg_int(1,line,file,"%s (%s) %s", MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_READING_FAILED);
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416 | break;
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417 |
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418 | case MRCONF_FIELD_NOT_FOUND:
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419 | mr_msg_int(1,line,file,"%s (%s) %s \"%s\"", MRCONF_STR_WARNING, mr_conf_filename, MRCONF_STR_FIELD_NOT_FOUND, add_line);
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420 | break;
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421 |
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422 | case MRCONF_FIELD_NO_VALUE:
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423 | mr_msg_int(1,line,file,"%s (%s) %s \"%s\"", MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_FIELD_NO_VALUE, add_line);
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424 | mr_msg_int(1,line,file,"%s (%s) %s", MRCONF_STR_WARNING, mr_conf_filename, MRCONF_STR_IGNORE);
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425 | break;
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426 |
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427 | case MRCONF_CLOSE_BUT_NOT_OPEN:
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428 | mr_msg_int(1,line,file,"%s (%s) %s", MRCONF_STR_WARNING, mr_conf_filename, MRCONF_STR_CLOSE_BUT_NOT_OPEN);
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429 | break;
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430 |
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431 | case MRCONF_CALL_BUT_NOT_OPEN:
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432 | mr_msg_int(1,line,file,"%s (%s) %s", MRCONF_STR_WARNING, mr_conf_filename, MRCONF_STR_CALL_BUT_NOT_OPEN);
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433 | break;
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434 |
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435 | case MRCONF_OPEN_OPENED:
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436 | mr_msg_int(1,line,file,"%s (%s) %s", MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_OPEN_OPENED);
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437 | break;
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438 |
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439 | case MRCONF_STRING_QUOTE:
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440 | mr_msg_int(1,line,file,"%s: %s (%s) %s", add_line, MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_STRING_QUOTE);
|
---|
441 | break;
|
---|
442 |
|
---|
443 | case MRCONF_STRING_ENDQUOTE:
|
---|
444 | mr_msg_int(1,line,file,"%s: %s (%s) %s", add_line, MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_STRING_ENDQUOTE);
|
---|
445 | break;
|
---|
446 |
|
---|
447 | default:
|
---|
448 | mr_msg_int(1,line,file,"%s (%s) %s", MRCONF_STR_ERROR, mr_conf_filename, MRCONF_STR_DEFAULT_ERROR);
|
---|
449 | break;
|
---|
450 | }
|
---|
451 | }
|
---|
452 | }
|
---|