/*
* load a configuration file into memory, allocating structures as required
*/
struct config_sect *config_load (char *filename)
{
FILE *fp;
char line[MAX_CONF_LEN];
struct config_sect *sects = NULL;
struct config_sect *cur_sect = NULL;
struct config_token *cur_token = NULL;
char *token;
char *value;
fp = fopen (filename, "r");
if (!fp) {
perror ("config file");
return NULL;
}
while (fgets(line, MAX_CONF_LEN, fp)) {
if (line[0] == '#') continue; /* skip lines with comment */
if (strlen (line) <= 1) continue;
line[strlen (line) - 1] = 0; /* remove trailing '\n' */
if (line[0] == '[') { /* section header */
token = strtok (line + 1, "]");
if (token != NULL) {
struct config_sect *new_sect = config_new_section (token);
if (new_sect) {
if (cur_sect) {
cur_sect->next = new_sect;
} else {
sects = new_sect;
}
cur_sect = new_sect;
cur_token = NULL;
}
}
} else {
token = strtok_r (line, " \t=", &value);
if (token != NULL) {
struct config_token *new_token;
value = strtok (value, " =#\t");
if (!cur_sect) {
cur_sect = config_new_section ("default");
sects = cur_sect;
}
new_token = config_new_token (token, value);
if (new_token) {
if (cur_token) {
cur_token->next = new_token;
} else {
cur_sect->tokens = new_token;
}
cur_token = new_token;
}
}
}
}
fclose(fp);
return sects;
} /* config_load () */
/*
* load a configuration file into memory, allocating structures as required
*/
struct config_sect *
config_load(char *filename)
{
FILE *fp;
char line[MAX_CONF_LEN];
struct config_sect *sects = NULL;
struct config_sect *cur_sect = NULL;
struct config_token *cur_token = NULL;
char *token;
char *value;
fp = fopen(filename, "r");
check(fp != NULL, "Cannot open the specified configuration file.");
while (fgets(line, MAX_CONF_LEN, fp) != NULL) {
/*
* Skip linear white space at the beginning of the line.
*/
char *p;
for (p = line; *p == ' ' || *p == '\t'; p++);
if (p != line)
/**
* The original implementation uses strcpy(3), which is acceptable
* in most cases. However, in this case, `s1` and `s2` overlap.
* According to POSIX.1-2008, "If copying takes place between
* objects that overlap, the behavior is undefined." Hence, I
* replace it with memmove(3), which "copy bytes in memory with
* overlapping areas".
*/
memmove(line, p, strlen(p) + 1);
if (line[0] == '#')
continue; /* skip lines with comment */
if (strlen(line) <= 1)
continue;
line[strlen(line) - 1] = 0; /* remove trailing '\n' */
if (line[0] == '[') { /* section header */
token = strtok(line + 1, "]");
if (token != NULL) {
struct config_sect *new_sect = config_new_section(token);
if (new_sect != NULL) {
if (cur_sect != NULL) {
cur_sect->next = new_sect;
} else {
sects = new_sect;
}
cur_sect = new_sect;
cur_token = NULL;
}
}
} else {
token = strtok_r(line, " \t=", &value);
if (token != NULL) {
struct config_token *new_token;
value = strtok(value, " =#\t");
if (cur_sect == NULL) {
cur_sect = config_new_section("default");
sects = cur_sect;
}
new_token = config_new_token(token, value);
if (new_token != NULL) {
if (cur_token) {
cur_token->next = new_token;
} else {
cur_sect->tokens = new_token;
}
cur_token = new_token;
}
}
}
}
fclose(fp);
return sects;
error:
if (fp != NULL)
fclose(fp);
return NULL;
} /* config_load () */