static int
cf_int(char *val)
{
char *end;
errno = 0;
long int x = strtol(val, &end, 10);
if (errno || end == val || end && *end)
cf_err("Invalid number");
if ((long int)(int) x != x)
cf_err("Number out of range");
return x;
}
static void
cf_entry_compound(char *key, char *subkey, char *val)
{
if (strncmp(key, "box", 3))
cf_err("Unknown configuration section");
int box_id = cf_int(key + 3);
struct cf_per_box *c = cf_per_box(box_id);
if (!strcmp(subkey, "cpus"))
c->cpus = cf_string(val);
else if (!strcmp(subkey, "mems"))
c->mems = cf_string(val);
else
cf_err("Unknown per-box configuration item");
}
static void
cf_check(void)
{
if (!cf_box_root ||
!cf_cg_root ||
!cf_first_uid ||
!cf_first_gid ||
!cf_num_boxes)
cf_err("Configuration is not complete");
}
void
cf_parse(void)
{
FILE *f = fopen(CONFIG_FILE, "r");
if (!f)
die("Cannot open %s: %m", CONFIG_FILE);
char line[MAX_LINE_LEN];
while (fgets(line, sizeof(line), f))
{
line_number++;
char *nl = strchr(line, '\n');
if (!nl)
cf_err("Line not terminated or too long");
*nl = 0;
if (!line[0] || line[0] == '#')
continue;
char *s = line;
while (*s && *s != ' ' && *s != '\t' && *s != '=')
s++;
while (*s == ' ' || *s == '\t')
*s++ = 0;
if (*s != '=')
cf_err("Syntax error, expecting key=value");
*s++ = 0;
while (*s == ' ' || *s == '\t')
*s++ = 0;
cf_entry(line, s);
}
fclose(f);
cf_check();
}
void cf_entry(char *key, char *val)
{
if (!strcmp(key, "box_root"))
cf_box_root = cf_string(val);
else if (!strcmp(key, "cg_root"))
cf_cg_root = cf_string(val);
else if (!strcmp(key, "first_uid"))
cf_first_uid = cf_int(val);
else if (!strcmp(key, "first_gid"))
cf_first_gid = cf_int(val);
else if (!strcmp(key, "num_boxes"))
cf_num_boxes = cf_int(val);
else
cf_err("Unknown configuration item");
}