| andy89038 |
07-09-2010 09:27 AM |
Having issues with typedef struct in c
Thanks for taking the time to read my post. I'm trying to read from a config file and set my results to a struct so that I can access the parameters easily. My code was modified from a post by paulsm4 and is as follows:
Code:
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
typedef struct {
char *base;
char *alert_status_file;
char *alert_email;
char *log_file;
int email_throttle;
char *dbase;
char *db_usr;
char *db_pass;
char *test;
} CONFIG ;
#define MAXLEN 80
time_t get_time();
void get_config(CONFIG *conf);
void mysql();
trim (char* in_string);
int main ()
{
printf("%ld hours since January 1, 1970. \n", get_time());
CONFIG cfg;
get_config(&cfg);
printf("base is: %s \n",cfg.base);
printf("dbase is: %s \n",cfg.dbase);
printf("db_usr is: %s \n",cfg.db_usr);
printf("alert_status_file is: %s \n",cfg.alert_status_file);
printf("alert_email is: %s \n",cfg.alert_email);
printf("log_file is: %s \n",cfg.log_file);
printf("db_pass is: %s \n",cfg.db_pass);
printf("email_throttle is: %s \n",cfg.email_throttle);
return 0;
}
time_t get_time () {
time_t seconds, rt_time;
seconds = time (NULL);
rt_time = seconds/3600;
return rt_time;
}
void get_config (CONFIG *conf)
{
char *line, buffer[MAXLEN];
char key[MAXLEN], value[MAXLEN];
FILE *FH;
FH = fopen("snort_alert.conf", "r");
if (FH == NULL)
{
printf("Could not open snort_alert.conf\n");
exit(1);
}
while (line = fgets(buffer, sizeof(buffer), FH) != NULL)
{
/* Skip blank lines and comments */
if(buffer[0] == "\n" || buffer[0] == "#")
continue;
/*tokanize key value pairs*/
line = strtok(buffer, "=");
if(line == NULL){
continue;
}
else {
strncpy(key, line, MAXLEN);
trim(key);
}
line = strtok(NULL, "=");
if(line == NULL){
continue;
}
else{
strncpy(value, line, MAXLEN);
trim(value);
}
printf("key = %s: value = %s\n",key,value);
/* Copy into correct entry in parameters struct */
if(!strcmp( key, "base"))
conf->base = value;
else if (!strcmp( key, "alert_status_file"))
conf->alert_status_file = value;
else if (!strcmp( key, "alert_email"))
conf->alert_email = value;
else if (!strcmp( key, "log_file"))
conf->log_file = value;
else if (!strcmp( key, "email_throttle"))
conf->email_throttle = value;
else if (!strcmp( key, "dbase"))
conf->dbase = value;
else if (!strcmp( key, "db_usr"))
conf->db_usr = value;
else if (!strcmp( key, "db_pass"))
conf->db_pass = value;
else
printf("WARNING: %s/%s: Unknown name/value pair!\n", key, value);
}
if(!strcmp(key, "alert_email"))
printf("***key %s equals base. Value was set to %s\n",key, conf->base);
fclose(FH);
printf(" base = %s\n alert_status_file = %s\n",conf->base,conf->alert_status_file);
}
trim (char * in_string)
{
/* Initialize start, end pointers */
char *start_pos = in_string, *end_pos = &in_string[strlen (in_string) - 1];
/* Trim and delimit right side */
while ( (isspace (*end_pos)) && (end_pos >= start_pos) )
{
end_pos--;
*(end_pos+1) = '\0';
}
/* Trim left side */
while ( (isspace (*start_pos)) && (start_pos < end_pos) )
{
start_pos++;
}
/* Copy finished string */
strcpy (in_string, start_pos);
return in_string;
}
config file
Code:
#snort alert config file
base = /etc/snort_alerts
dbase = snort
db_usr = _snort
email_throttle = 10
alert_status_file = alert_stat
alert_email = lahblah@blah.com
log_file = alert_log
db_pass= xxxxx
Pardon all my debugging statements.
The output is:
Code:
355189 hours since January 1, 1970.
key = base: value = /etc/snort_alerts
key = dbase: value = snort
key = db_usr: value = _snort
key = email_throttle: value = 10
key = alert_status_file: value = alert_stat
key = alert_email: value = blahblah@blah.com
key = log_file: value = alert_log
key = db_pass: value = xxxxx
base = xxxxx
alert_status_file = xxxxx
base is: xxxxx
dbase is: xxxxx
db_usr is: xxxxx
alert_status_file is: xxxxx
alert_email is: xxxxx
log_file is: xxxxx
db_pass is: xxxxx
email_throttle is: xxxxx
As you can see from the output everything seems to go fine up until I start trying to store my values. I'm thinking my problem is pointers but when I try to specify the size of the variables I start getting errors. I have a test case in which I can get it all to work fine and I'm not understanding why it works in my test case and not in the code above. I haven't done much C programming and any help you can provide would be greatly appreciated. Here is my test case that appears to work correctly...
Code:
#include <stdio.h>
#include <string.h>
typedef struct {
char *a;
char *b;
char *c;
char *d;
int e;
} test ;
void get_value (test *p);
int main ()
{
test mystructure;
get_value(&mystructure);
printf("The value of a is: %s.\n",mystructure.a);
printf("The value of b is : %s\n",mystructure.b);
printf("The value of c is : %s\n",mystructure.c);
printf("The value of d is : %s\n",mystructure.d);
printf("The value of e is : %d\n",mystructure.e);
return 0;
}
void get_value (test *p)
{
char *value1;
char *value2;
char *value3;
char *value4;
int value5;
value1 = "Hello World";
value2 = "tset1";
value3 = "eh";
value4 = "Testing";
value5 = 10;
if(!strcmp(value1, "Hello World"));
p->a = value1;
p->b = value2;
p->c = value3;
p->d = value4;
p->e = value5;
}
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