[767] | 1 | /* mr_conf.c
|
---|
| 2 | *
|
---|
| 3 | * $Id$
|
---|
| 4 | *
|
---|
| 5 | * Based on the work done by Anton (c)2002-2004 Anton Kulchitsky mailto:anton@kulchitsky.org
|
---|
| 6 | * Code (c)2006 Bruno Cornec <bruno@mondorescue.org>
|
---|
| 7 | *
|
---|
| 8 | * Main file of mr_conf : a very small and simple
|
---|
| 9 | * library for configuration file reading
|
---|
[852] | 10 | *
|
---|
| 11 | * Provided under the GPLv2
|
---|
[767] | 12 | */
|
---|
| 13 |
|
---|
| 14 |
|
---|
| 15 | #include <stdlib.h>
|
---|
| 16 | #include <stdio.h>
|
---|
| 17 | #include <string.h>
|
---|
| 18 |
|
---|
[900] | 19 | #include "mr_msg.h"
|
---|
| 20 | #include "mr_mem.h"
|
---|
| 21 | #include "mr_gettext.h"
|
---|
[767] | 22 |
|
---|
| 23 | /* error flags */
|
---|
| 24 | #define MRCONF_NO_ERROR 0x0
|
---|
| 25 | #define MRCONF_BAD_FILE 0x1
|
---|
| 26 | #define MRCONF_ALLOC_FAILED 0x2
|
---|
| 27 | #define MRCONF_READING_FAILED 0x3
|
---|
| 28 | #define MRCONF_NO_GROUP_START 0x4
|
---|
| 29 | #define MRCONF_NO_GROUP_END 0x5
|
---|
| 30 | #define MRCONF_FIELD_NOT_FOUND 0x6
|
---|
| 31 | #define MRCONF_FIELD_NO_VALUE 0x7
|
---|
| 32 | #define MRCONF_TOO_LONG_STRING 0x8
|
---|
| 33 | #define MRCONF_CLOSE_BUT_NOT_OPEN 0x9
|
---|
| 34 | #define MRCONF_OPEN_OPENED 0xA
|
---|
| 35 | #define MRCONF_CALL_BUT_NOT_OPEN 0xB
|
---|
| 36 |
|
---|
| 37 | /*setting flags*/
|
---|
| 38 | #define MRCONF_FLAG_VERBOSE 0x1
|
---|
| 39 |
|
---|
| 40 | /*All strings of the library are here*/
|
---|
| 41 | #define MRCONF_STR_ERROR _("MRCONF: Error:")
|
---|
| 42 | #define MRCONF_STR_WARNING _("MRCONF: Warning:")
|
---|
| 43 |
|
---|
| 44 | #define MRCONF_STR_BAD_FILE _("cannot open the file: ")
|
---|
| 45 | #define MRCONF_STR_ALLOC_FAILED _("cannot allocate the memory")
|
---|
| 46 | #define MRCONF_STR_READING_FAILED _("cannot read file into buffer")
|
---|
| 47 | #define MRCONF_STR_DEFAULT_ERROR _("default")
|
---|
| 48 | #define MRCONF_STR_FIELD_NOT_FOUND _("the field is not found, field:")
|
---|
| 49 | #define MRCONF_STR_FIELD_NO_VALUE _("the field :")
|
---|
| 50 | #define MRCONF_STR_OPEN_OPENED _("attempt to open mr_conf, but it is opened: aborted")
|
---|
| 51 | #define MRCONF_STR_HALT _("MRCONF: Error occured: immidiate halt")
|
---|
| 52 |
|
---|
| 53 | /*warnings*/
|
---|
| 54 | #define MRCONF_STR_SET_TO_ZERO _("variable will be set to 0")
|
---|
| 55 | #define MRCONF_STR_IGNORE _("has no value, ignoring it")
|
---|
| 56 | #define MRCONF_STR_CLOSE_BUT_NOT_OPEN _("attempt to close mr_conf but it has not been opened yet")
|
---|
| 57 | #define MRCONF_STR_CALL_BUT_NOT_OPEN _("attempt to use mr_conf when it has not been opened yet")
|
---|
| 58 |
|
---|
| 59 | /*Flags of internal state*/
|
---|
| 60 | #define MRCONF_INTFLAG_OPEN 0x1 /*set if memory allocated */
|
---|
| 61 |
|
---|
| 62 | /* Character for comments */
|
---|
| 63 | #define MRCONF_COMM_CHAR '#'
|
---|
| 64 |
|
---|
| 65 | /*"private" members declarations*/
|
---|
| 66 | static size_t mr_conf_filesize(const char *name);
|
---|
| 67 | static void mr_conf_error_msg(int error_code, const char *add_line);
|
---|
| 68 | static void mr_conf_remove_comments();
|
---|
| 69 | static int mr_conf_check_int_flag(const int flag);
|
---|
| 70 | static void mr_conf_set_int_flag(const int flag);
|
---|
| 71 | static void mr_conf_drop_int_flag(const int flag);
|
---|
| 72 |
|
---|
| 73 | /*global "private" variables*/
|
---|
| 74 | static char *buffer = NULL; /*buffer for configuration file */
|
---|
| 75 | static int internal_flags = 0; /*state of the module */
|
---|
| 76 | static FILE *CONF = NULL; /* Configuration file FD */
|
---|
| 77 |
|
---|
[900] | 78 | /*if output all error and warning messages*/
|
---|
[767] | 79 | static int mr_conf_flags = MRCONF_FLAG_VERBOSE;
|
---|
| 80 |
|
---|
| 81 | /*
|
---|
| 82 | * Format of the configuration file is as follows:
|
---|
| 83 | *
|
---|
| 84 | * attribute1 = int_value
|
---|
| 85 | * attribute2 = float_value
|
---|
| 86 | * attribute3 = string_value
|
---|
| 87 | */
|
---|
| 88 |
|
---|
| 89 |
|
---|
| 90 | /*open and read file: each call must be coupled with mr_conf_close
|
---|
| 91 | function: return 0 if success*/
|
---|
| 92 | int mr_conf_open(const char *filename) {
|
---|
| 93 | size_t length; /*length of the buffer/file */
|
---|
[900] | 94 | size_t res = 0;
|
---|
[767] | 95 |
|
---|
| 96 | /* check if mr_conf is already opened? */
|
---|
| 97 | if (mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) {
|
---|
| 98 | mr_conf_error_msg(MRCONF_OPEN_OPENED, NULL);
|
---|
| 99 | return MRCONF_OPEN_OPENED;
|
---|
| 100 | }
|
---|
| 101 |
|
---|
| 102 | length = mr_conf_filesize(filename);
|
---|
| 103 | CONF = fopen(filename, "r");
|
---|
| 104 |
|
---|
| 105 | /*if file is empty or not exist => error */
|
---|
| 106 | if (length == 0) {
|
---|
| 107 | mr_conf_error_msg(MRCONF_BAD_FILE, filename);
|
---|
| 108 | return (MRCONF_BAD_FILE);
|
---|
| 109 | }
|
---|
| 110 |
|
---|
| 111 | /*creating and reading buffer for file content */
|
---|
| 112 |
|
---|
| 113 | /*allocate memory for the buffers */
|
---|
| 114 | buffer = (char *) malloc(sizeof(char) * (length + 1));
|
---|
| 115 |
|
---|
| 116 | if (buffer == NULL) {
|
---|
| 117 | mr_conf_error_msg(MRCONF_ALLOC_FAILED, "");
|
---|
| 118 | return (MRCONF_ALLOC_FAILED);
|
---|
| 119 | }
|
---|
| 120 |
|
---|
| 121 | /*set flag that module is in "open" state */
|
---|
| 122 | mr_conf_set_int_flag(MRCONF_INTFLAG_OPEN);
|
---|
| 123 |
|
---|
| 124 | /*reading file in buffer (skip all 0 characters) */
|
---|
| 125 |
|
---|
[900] | 126 | res = fread(buffer, sizeof(char), length, CONF);
|
---|
[767] | 127 | buffer[length] = (char) 0; /*finalize the string */
|
---|
| 128 |
|
---|
| 129 | if (ferror(CONF)) {
|
---|
| 130 | mr_conf_error_msg(MRCONF_READING_FAILED, "");
|
---|
| 131 | return (MRCONF_READING_FAILED);
|
---|
| 132 | }
|
---|
| 133 |
|
---|
| 134 | /* finally we have to remove all comment lines */
|
---|
| 135 | mr_conf_remove_comments();
|
---|
| 136 |
|
---|
| 137 | return MRCONF_NO_ERROR;
|
---|
| 138 | }
|
---|
| 139 |
|
---|
| 140 | /*release all memory and prepare to the next possiable config file*/
|
---|
| 141 | void mr_conf_close() {
|
---|
| 142 | /* if not opened => error */
|
---|
| 143 | if (!mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) {
|
---|
| 144 | mr_conf_error_msg(MRCONF_CLOSE_BUT_NOT_OPEN, NULL);
|
---|
| 145 | }
|
---|
[900] | 146 | mr_free(buffer);
|
---|
[767] | 147 | fclose(CONF);
|
---|
| 148 |
|
---|
| 149 | /*set flag that module is in "close" state */
|
---|
| 150 | mr_conf_drop_int_flag(MRCONF_INTFLAG_OPEN);
|
---|
| 151 | }
|
---|
| 152 |
|
---|
| 153 | /*read field value after string str in the current file*/
|
---|
| 154 | static char *mr_conf_read(const char *field_name) {
|
---|
| 155 | char *p = NULL; /*pointer to the field */
|
---|
| 156 |
|
---|
| 157 | /* check if mr_conf is not yet opened? */
|
---|
| 158 | if (!mr_conf_check_int_flag(MRCONF_INTFLAG_OPEN)) {
|
---|
| 159 | mr_conf_error_msg(MRCONF_CALL_BUT_NOT_OPEN, NULL);
|
---|
| 160 | return NULL;
|
---|
| 161 | }
|
---|
| 162 |
|
---|
| 163 | /*read the number */
|
---|
| 164 | p = strstr(buffer, field_name);
|
---|
| 165 | if (p == NULL) {
|
---|
| 166 | mr_conf_error_msg(MRCONF_FIELD_NOT_FOUND, field_name);
|
---|
| 167 | return NULL;
|
---|
| 168 | } else {
|
---|
| 169 | p += strlen(field_name);
|
---|
| 170 | while ((*p != '\n') && (*p != '\0') && (*p != '=')) {
|
---|
| 171 | p++;
|
---|
| 172 | }
|
---|
| 173 | if (*p != '=') {
|
---|
| 174 | mr_conf_error_msg(MRCONF_FIELD_NO_VALUE, field_name);
|
---|
| 175 | return NULL;
|
---|
| 176 | } else {
|
---|
| 177 | /* points after the = sign */
|
---|
| 178 | p++;
|
---|
| 179 | }
|
---|
| 180 | }
|
---|
| 181 | /* skip initial spaces and tabs after = */
|
---|
| 182 | while ((*p == ' ') || (*p == '\t')) {
|
---|
| 183 | p++;
|
---|
| 184 | }
|
---|
| 185 |
|
---|
| 186 | return p;
|
---|
| 187 | }
|
---|
| 188 |
|
---|
| 189 | /*read integer number after string str in the current file*/
|
---|
| 190 | int mr_conf_iread(const char *field_name) {
|
---|
| 191 | char *p = NULL; /*pointer to the field */
|
---|
| 192 | int ret = 0; /*return value */
|
---|
| 193 |
|
---|
| 194 | p = mr_conf_read(field_name);
|
---|
| 195 | if (p != NULL) {
|
---|
| 196 | ret = atoi(p);
|
---|
| 197 | }
|
---|
| 198 | return ret;
|
---|
| 199 | }
|
---|
| 200 |
|
---|
| 201 | /*read float/double number after string str in the current file*/
|
---|
| 202 | double mr_conf_fread(const char *field_name) {
|
---|
| 203 | char *p = NULL; /*pointer to the field */
|
---|
| 204 | double ret = 0.0; /*return value */
|
---|
| 205 |
|
---|
| 206 | p = mr_conf_read(field_name);
|
---|
| 207 | if (p != NULL) {
|
---|
| 208 | ret = atof(p);
|
---|
| 209 | }
|
---|
| 210 | return ret;
|
---|
| 211 | }
|
---|
| 212 |
|
---|
| 213 | /*
|
---|
| 214 | reads string outstr after string str in the current file (between
|
---|
[900] | 215 | "..."), not more than maxlength symbols: cannot check if outstr has
|
---|
[767] | 216 | enough length! It must be at least maxlength+1 ! Returns number of
|
---|
| 217 | read chars
|
---|
| 218 | */
|
---|
| 219 | char *mr_conf_sread(const char *field_name) {
|
---|
| 220 | char *p = NULL; /*pointer to the field */
|
---|
| 221 | char *q = NULL; /*pointer to the field */
|
---|
| 222 | char *r = NULL; /*pointer to the field */
|
---|
| 223 | char *ret = NULL; /*return value */
|
---|
| 224 | int size = 0; /*size of returned string */
|
---|
| 225 | int i = 0;
|
---|
| 226 |
|
---|
| 227 | ret = NULL;
|
---|
| 228 |
|
---|
| 229 | p = mr_conf_read(field_name);
|
---|
| 230 | if (p == NULL) {
|
---|
| 231 | return(p);
|
---|
| 232 | }
|
---|
[900] | 233 | mr_asprintf(&q, p);
|
---|
[767] | 234 |
|
---|
| 235 | /* trunk at first \n */
|
---|
| 236 | r = index(q,'\n');
|
---|
| 237 |
|
---|
| 238 | size = r-q+1;
|
---|
| 239 | /*copy filtered data to the buffer */
|
---|
| 240 | ret = (char *) malloc(sizeof(char) * (size));
|
---|
| 241 | if (ret == NULL) {
|
---|
| 242 | mr_conf_error_msg(MRCONF_ALLOC_FAILED, "");
|
---|
| 243 | return (NULL);
|
---|
| 244 | }
|
---|
| 245 | while (i < size - 1) {
|
---|
| 246 | ret[i] = *p;
|
---|
| 247 | i++;
|
---|
| 248 | p++;
|
---|
| 249 | }
|
---|
| 250 |
|
---|
| 251 | ret[i] = (char) 0; /*and set its length */
|
---|
[900] | 252 | mr_free(q);
|
---|
[767] | 253 |
|
---|
| 254 | return ret;
|
---|
| 255 | }
|
---|
| 256 |
|
---|
| 257 | /*removes all comments from the buffer*/
|
---|
| 258 | static void mr_conf_remove_comments() {
|
---|
| 259 | char *tmp_buf; /*temporary buffer without comments */
|
---|
| 260 | size_t length /*initial length */ ;
|
---|
| 261 | size_t i; /*iterator */
|
---|
| 262 | size_t k; /*conditioned iterator for tmp_buffer */
|
---|
| 263 |
|
---|
| 264 | length = strlen(buffer);
|
---|
| 265 |
|
---|
| 266 | /*sizing the new chain */
|
---|
| 267 | k = 0;
|
---|
| 268 | i = 0;
|
---|
| 269 | while (i < length) {
|
---|
| 270 | if (buffer[i] != MRCONF_COMM_CHAR) {
|
---|
| 271 | k++;
|
---|
| 272 | i++;
|
---|
| 273 | } else {
|
---|
| 274 | while ((buffer[i] != '\n') && (buffer[i] != (char) 0)) {
|
---|
| 275 | i++;
|
---|
| 276 | }
|
---|
| 277 | }
|
---|
| 278 | }
|
---|
| 279 | /* k is new buffer length now */
|
---|
| 280 | tmp_buf = (char *) malloc(sizeof(char) * (k + 1));
|
---|
| 281 | if (tmp_buf == NULL) {
|
---|
| 282 | mr_conf_error_msg(MRCONF_ALLOC_FAILED, "");
|
---|
| 283 | return;
|
---|
| 284 | }
|
---|
| 285 |
|
---|
| 286 | k = 0;
|
---|
| 287 | i = 0;
|
---|
| 288 | while (i < length) {
|
---|
| 289 | if (buffer[i] != MRCONF_COMM_CHAR) {
|
---|
| 290 | tmp_buf[k++] = buffer[i++];
|
---|
| 291 | } else {
|
---|
| 292 | while ((buffer[i] != '\n') && (buffer[i] != (char) 0)) {
|
---|
| 293 | i++;
|
---|
| 294 | }
|
---|
| 295 | }
|
---|
| 296 | }
|
---|
| 297 | tmp_buf[k] = (char) 0; /*and set its length */
|
---|
| 298 |
|
---|
[900] | 299 | mr_free(buffer);
|
---|
[767] | 300 | /*copy filtered data to the buffer */
|
---|
| 301 | buffer = tmp_buf;
|
---|
| 302 | }
|
---|
| 303 |
|
---|
| 304 | static int mr_conf_check_int_flag(const int flag) {
|
---|
| 305 | return (flag & internal_flags);
|
---|
| 306 | }
|
---|
| 307 |
|
---|
| 308 | static void mr_conf_set_int_flag(const int flag) {
|
---|
| 309 | internal_flags = flag | internal_flags;
|
---|
| 310 | }
|
---|
| 311 |
|
---|
| 312 | static void mr_conf_drop_int_flag(const int flag) {
|
---|
| 313 | internal_flags = (~flag) & internal_flags;
|
---|
| 314 | }
|
---|
| 315 |
|
---|
| 316 |
|
---|
| 317 | /*local function to define size of a file. Return 0 for mistake*/
|
---|
| 318 | static size_t mr_conf_filesize(const char *name) {
|
---|
| 319 | FILE *F = fopen(name, "r"); /*file to open */
|
---|
| 320 | size_t length; /*number to return */
|
---|
| 321 |
|
---|
| 322 | if (F == NULL) {
|
---|
| 323 | return 0;
|
---|
| 324 | }
|
---|
| 325 |
|
---|
| 326 | fseek(F, 0, SEEK_END); /*set position to the end of file */
|
---|
| 327 | length = ftell(F); /*define number of position=> this is its
|
---|
| 328 | length */
|
---|
| 329 | fclose(F);
|
---|
| 330 |
|
---|
| 331 | return length;
|
---|
| 332 | }
|
---|
| 333 |
|
---|
| 334 | /*output error message*/
|
---|
| 335 | static void mr_conf_error_msg(int error_code, const char *add_line) {
|
---|
| 336 | if ((mr_conf_flags & MRCONF_FLAG_VERBOSE)) { /*if verbose mode */
|
---|
| 337 | switch (error_code) {
|
---|
| 338 | case MRCONF_BAD_FILE:
|
---|
[900] | 339 | mr_msg(0,"%s %s %s\n", MRCONF_STR_ERROR, MRCONF_STR_BAD_FILE,
|
---|
[767] | 340 | add_line);
|
---|
| 341 | break;
|
---|
| 342 |
|
---|
| 343 | case MRCONF_ALLOC_FAILED:
|
---|
[900] | 344 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_ALLOC_FAILED);
|
---|
[767] | 345 | break;
|
---|
| 346 |
|
---|
| 347 | case MRCONF_READING_FAILED:
|
---|
[900] | 348 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_READING_FAILED);
|
---|
[767] | 349 | break;
|
---|
| 350 |
|
---|
| 351 | case MRCONF_FIELD_NOT_FOUND:
|
---|
[900] | 352 | mr_msg(1,"%s %s \"%s\"\n", MRCONF_STR_ERROR, MRCONF_STR_FIELD_NOT_FOUND, add_line);
|
---|
| 353 | mr_msg(1,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_SET_TO_ZERO);
|
---|
[767] | 354 | break;
|
---|
| 355 |
|
---|
| 356 | case MRCONF_FIELD_NO_VALUE:
|
---|
[900] | 357 | mr_msg(1,"%s %s \"%s\"\n", MRCONF_STR_ERROR, MRCONF_STR_FIELD_NO_VALUE, add_line);
|
---|
| 358 | mr_msg(1,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_IGNORE);
|
---|
[767] | 359 | break;
|
---|
| 360 |
|
---|
| 361 | case MRCONF_CLOSE_BUT_NOT_OPEN:
|
---|
[900] | 362 | mr_msg(0,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_CLOSE_BUT_NOT_OPEN);
|
---|
[767] | 363 | break;
|
---|
| 364 |
|
---|
| 365 | case MRCONF_CALL_BUT_NOT_OPEN:
|
---|
[900] | 366 | mr_msg(0,"%s %s\n", MRCONF_STR_WARNING, MRCONF_STR_CALL_BUT_NOT_OPEN);
|
---|
[767] | 367 | break;
|
---|
| 368 |
|
---|
| 369 | case MRCONF_OPEN_OPENED:
|
---|
[900] | 370 | mr_msg(0,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_OPEN_OPENED);
|
---|
[767] | 371 | break;
|
---|
| 372 |
|
---|
| 373 | default:
|
---|
[900] | 374 | mr_msg(1,"%s %s\n", MRCONF_STR_ERROR, MRCONF_STR_DEFAULT_ERROR);
|
---|
[767] | 375 | break;
|
---|
| 376 | }
|
---|
| 377 | }
|
---|
| 378 | }
|
---|