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config.c
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config.c
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/*! \file config.c
* \author Lorenzo Miniero <[email protected]>
* \copyright GNU General Public License v3
* \brief Configuration files parsing
* \details Implementation of a parser of INI configuration files.
*
* \ingroup core
* \ref core
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "config.h"
#include "debug.h"
#include "utils.h"
/* Filename helper */
static char *get_filename(const char *path) {
char *filename = NULL;
if(path)
filename = strrchr(path, '/')+1;
return filename;
}
/* Trimming helper */
static char *ltrim(char *s) {
if(strlen(s) == 0)
return s;
while(isspace(*s))
s++;
return s;
}
static char *rtrim(char *s) {
if(strlen(s) == 0)
return s;
char* back = s + strlen(s);
while(isspace(*--back));
*(back+1) = '\0';
return s;
}
static char *trim(char *s) {
if(strlen(s) == 0)
return s;
return rtrim(ltrim(s));
}
/* Memory management helpers */
static void janus_config_free_item(gpointer data) {
janus_config_item *i = (janus_config_item *)data;
if(i) {
if(i->name)
g_free((gpointer)i->name);
if(i->value)
g_free((gpointer)i->value);
g_free(i);
}
}
static void janus_config_free_category(gpointer data) {
janus_config_category *c = (janus_config_category *)data;
if(c) {
if(c->name)
g_free((gpointer)c->name);
if(c->items)
g_list_free_full(c->items, janus_config_free_item);
g_free(c);
}
}
/* Public methods */
janus_config *janus_config_parse(const char *config_file) {
if(config_file == NULL)
return NULL;
char *filename = get_filename(config_file);
if(filename == NULL) {
JANUS_LOG(LOG_ERR, "Invalid filename %s\n", config_file);
return NULL;
}
/* Open file */
FILE *file = fopen(config_file, "rt");
if(!file) {
JANUS_LOG(LOG_ERR, " -- Error reading configuration file '%s'... error %d (%s)\n", filename, errno, strerror(errno));
return NULL;
}
/* Create configuration instance */
janus_config *jc = g_malloc0(sizeof(janus_config));
jc->name = g_strdup(filename);
/* Traverse and parse it */
int line_number = 0;
char line_buffer[BUFSIZ];
janus_config_category *cg = NULL;
while(fgets(line_buffer, sizeof(line_buffer), file)) {
line_number++;
if(strlen(line_buffer) == 0)
continue;
/* Strip comments */
char *line = line_buffer, *sc = line, *c = NULL;
while((c = strchr(sc, ';')) != NULL) {
if(c == line || *(c-1) != '\\') {
/* Comment starts here */
*c = '\0';
break;
}
/* Escaped semicolon, remove the slash */
sc = c-1;
/* length will be at least 2: ';' '\0' */
memmove(sc, c, strlen(c)+1);
/* Go on */
sc++;
}
/* Trim (will remove newline characters too) */
line = trim(line);
if(strlen(line) == 0)
continue;
/* Parse */
if(line[0] == '[') {
/* Category */
line++;
char *end = strchr(line, ']');
if(end == NULL) {
JANUS_LOG(LOG_ERR, "Error parsing category at line %d: syntax error (%s)\n", line_number, filename);
janus_config_destroy(jc);
return NULL;
}
*end = '\0';
line = trim(line);
if(strlen(line) == 0) {
JANUS_LOG(LOG_ERR, "Error parsing category at line %d: no name (%s)\n", line_number, filename);
janus_config_destroy(jc);
return NULL;
}
cg = janus_config_add_category(jc, line);
if(cg == NULL) {
JANUS_LOG(LOG_ERR, "Error adding category %s (%s)\n", line, filename);
janus_config_destroy(jc);
return NULL;
}
} else {
/* Item */
char *name = line, *value = strchr(line, '=');
if(value == NULL || value == line) {
JANUS_LOG(LOG_ERR, "Error parsing item at line %d (%s)\n", line_number, filename);
janus_config_destroy(jc);
return NULL;
}
*value = '\0';
name = trim(name);
if(strlen(name) == 0) {
JANUS_LOG(LOG_ERR, "Error parsing item at line %d: no name (%s)\n", line_number, filename);
janus_config_destroy(jc);
return NULL;
}
value++;
value = trim(value);
if(strlen(value) == 0) {
JANUS_LOG(LOG_ERR, "Error parsing item at line %d: no value (%s)\n", line_number, filename);
janus_config_destroy(jc);
return NULL;
}
if(*value == '>') {
value++;
value = trim(value);
if(strlen(value) == 0) {
JANUS_LOG(LOG_ERR, "Error parsing item at line %d: no value (%s)\n", line_number, filename);
janus_config_destroy(jc);
return NULL;
}
}
if(janus_config_add_item(jc, cg ? cg->name : NULL, name, value) == NULL) {
if(cg == NULL)
JANUS_LOG(LOG_ERR, "Error adding item %s (%s)\n", name, filename);
else
JANUS_LOG(LOG_ERR, "Error adding item %s to category %s (%s)\n", name, cg->name, filename);
janus_config_destroy(jc);
return NULL;
}
}
}
fclose(file);
return jc;
}
janus_config *janus_config_create(const char *name) {
janus_config *jc = g_malloc0(sizeof(janus_config));
if(jc == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
if(name != NULL) {
jc->name = g_strdup(name);
}
return jc;
}
GList *janus_config_get_categories(janus_config *config) {
if(config == NULL)
return NULL;
return config->categories;
}
janus_config_category *janus_config_get_category(janus_config *config, const char *name) {
if(config == NULL || name == NULL)
return NULL;
if(config->categories == NULL)
return NULL;
GList *l = config->categories;
while(l) {
janus_config_category *c = (janus_config_category *)l->data;
if(c && c->name && !strcasecmp(name, c->name))
return c;
l = l->next;
}
return NULL;
}
GList *janus_config_get_items(janus_config_category *category) {
if(category == NULL)
return NULL;
return category->items;
}
janus_config_item *janus_config_get_item(janus_config_category *category, const char *name) {
if(category == NULL || name == NULL)
return NULL;
if(category->items == NULL)
return NULL;
GList *l = category->items;
while(l) {
janus_config_item *i = (janus_config_item *)l->data;
if(i && i->name && !strcasecmp(name, i->name))
return i;
l = l->next;
}
return NULL;
}
janus_config_item *janus_config_get_item_drilldown(janus_config *config, const char *category, const char *name) {
if(config == NULL || category == NULL || name == NULL)
return NULL;
janus_config_category *c = janus_config_get_category(config, category);
if(c == NULL)
return NULL;
return janus_config_get_item(c, name);
}
janus_config_category *janus_config_add_category(janus_config *config, const char *category) {
if(config == NULL || category == NULL)
return NULL;
janus_config_category *c = janus_config_get_category(config, category);
if(c != NULL) {
/* Category exists, return this */
return c;
}
c = g_malloc0(sizeof(janus_config_category));
if(c == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
c->name = g_strdup(category);
config->categories = g_list_append(config->categories, c);
return c;
}
int janus_config_remove_category(janus_config *config, const char *category) {
if(config == NULL || category == NULL)
return -1;
janus_config_category *c = janus_config_get_category(config, category);
if(c) {
config->categories = g_list_remove(config->categories, c);
janus_config_free_category(c);
return 0;
}
return -2;
}
janus_config_item *janus_config_add_item(janus_config *config, const char *category, const char *name, const char *value) {
if(config == NULL || name == NULL || value == NULL)
return NULL;
/* This will return the existing category, if it exists already */
janus_config_category *c = category ? janus_config_add_category(config, category) : NULL;
if(category != NULL && c == NULL) {
/* Create it */
JANUS_LOG(LOG_FATAL, "Category error!\n");
return NULL;
}
janus_config_item *item = c ? janus_config_get_item(c, name) : NULL;
if(item == NULL) {
/* Create it */
item = g_malloc0(sizeof(janus_config_item));
if(item == NULL) {
JANUS_LOG(LOG_FATAL, "Memory error!\n");
return NULL;
}
item->name = g_strdup(name);
item->value = g_strdup(value);
if(c != NULL) {
/* Add to category */
c->items = g_list_append(c->items, item);
} else {
/* Uncategorized item */
config->items = g_list_append(config->items, item);
}
} else {
/* Update it */
char *item_value = g_strdup(value);
if(item->value)
g_free((gpointer)item->value);
item->value = item_value;
}
return item;
}
int janus_config_remove_item(janus_config *config, const char *category, const char *name) {
if(config == NULL || category == NULL || name == NULL)
return -1;
janus_config_category *c = janus_config_add_category(config, category);
if(c == NULL)
return -2;
janus_config_item *item = janus_config_get_item(c, name);
if(item == NULL)
return -3;
c->items = g_list_remove(c->items, item);
janus_config_free_item(item);
return 0;
}
void janus_config_print(janus_config *config) {
if(config == NULL)
return;
JANUS_LOG(LOG_VERB, "[%s]\n", config->name ? config->name : "??");
if(config->items) {
GList *l = config->items;
while(l) {
janus_config_item *i = (janus_config_item *)l->data;
JANUS_LOG(LOG_VERB, " %s: %s\n", i->name ? i->name : "??", i->value ? i->value : "??");
l = l->next;
}
}
if(config->categories) {
GList *l = config->categories;
while(l) {
janus_config_category *c = (janus_config_category *)l->data;
JANUS_LOG(LOG_VERB, " [%s]\n", c->name ? c->name : "??");
if(c->items) {
GList *li = c->items;
while(li) {
janus_config_item *i = (janus_config_item *)li->data;
JANUS_LOG(LOG_VERB, " %s: %s\n", i->name ? i->name : "??", i->value ? i->value : "??");
li = li->next;
}
}
l = l->next;
}
}
}
gboolean janus_config_save(janus_config *config, const char *folder, const char *filename) {
if(config == NULL)
return -1;
FILE *file = NULL;
char path[1024];
if(folder != NULL) {
/* Create folder, if needed */
if(janus_mkdir(folder, 0755) < 0) {
JANUS_LOG(LOG_ERR, "Couldn't save configuration file, error creating folder '%s'...\n", folder);
return -2;
}
g_snprintf(path, 1024, "%s/%s.cfg", folder, filename);
} else {
g_snprintf(path, 1024, "%s.cfg", filename);
}
file = fopen(path, "wt");
if(file == NULL) {
JANUS_LOG(LOG_ERR, "Couldn't save configuration file, error opening file '%s'...\n", path);
return -3;
}
/* Print a header */
char date[64], header[256];
struct tm tmresult;
time_t ltime = time(NULL);
localtime_r(<ime, &tmresult);
strftime(date, sizeof(date), "%a %b %e %T %Y", &tmresult);
g_snprintf(header, 256, ";\n; File automatically generated on %s\n;\n\n", date);
fwrite(header, sizeof(char), strlen(header), file);
/* Go on with the configuration */
if(config->items) {
GList *l = config->items;
while(l) {
janus_config_item *i = (janus_config_item *)l->data;
if(i->name && i->value) {
fwrite(i->name, sizeof(char), strlen(i->name), file);
fwrite(" = ", sizeof(char), 3, file);
fwrite(i->value, sizeof(char), strlen(i->value), file);
fwrite("\n", sizeof(char), 1, file);
}
l = l->next;
}
}
if(config->categories) {
GList *l = config->categories;
while(l) {
janus_config_category *c = (janus_config_category *)l->data;
if(c->name) {
fwrite("[", sizeof(char), 1, file);
fwrite(c->name, sizeof(char), strlen(c->name), file);
fwrite("]\n", sizeof(char), 2, file);
if(c->items) {
GList *li = c->items;
while(li) {
janus_config_item *i = (janus_config_item *)li->data;
if(i->name && i->value) {
fwrite(i->name, sizeof(char), strlen(i->name), file);
fwrite(" = ", sizeof(char), 3, file);
/* If the value contains a semicolon, escape it */
if(strchr(i->value, ';')) {
char *value = g_strdup(i->value);
value = janus_string_replace((char *)value, ";", "\\;");
fwrite(value, sizeof(char), strlen(value), file);
fwrite("\n", sizeof(char), 1, file);
g_free(value);
} else {
/* No need to escape */
fwrite(i->value, sizeof(char), strlen(i->value), file);
fwrite("\n", sizeof(char), 1, file);
}
}
li = li->next;
}
}
}
fwrite("\r\n", sizeof(char), 2, file);
l = l->next;
}
}
fclose(file);
return 0;
}
void janus_config_destroy(janus_config *config) {
if(config == NULL)
return;
if(config->items) {
g_list_free_full(config->items, janus_config_free_item);
config->items = NULL;
}
if(config->categories) {
g_list_free_full(config->categories, janus_config_free_category);
config->items = NULL;
}
if(config->name)
g_free((gpointer)config->name);
g_free((gpointer)config);
config = NULL;
}