problem reading string from file

[seitan]

Helo forums,
I'me trying to read config file, - here's my c code:

void GetConf(){
FILE* config_fp;
char line[MAX_LINE_LEN+1];
char* var_word;
printf("\nReading config...\n");
config_fp = fopen("them.conf","r");
while(fgets(line, MAX_LINE_LEN, config_fp) != NULL){
    var_word=strtok(line, "\t =\n\r");
    if(var_word != NULL && var_word[0]!='#'){
        if(!strcmp(var_word,"hi_temp")){
            var_word=strtok(NULL, "\t =\n\r");
            hi_temp=atoi(var_word);
        }
        if (!strcmp(var_word,"lo_temp")){
            var_word=strtok(NULL, "\t =\n\r");
            lo_temp=atoi(var_word);
        }
        if (!strcmp(var_word,"log_file")){
          var_word=strtok(NULL, "\t =\n\r");
            log_file=var_word;
            printf ("Value inside clause: %s\n",var_word);
        }
    }
}
printf ("Value outside clause: %s",log_file);
printf ("Done.\n");
}

Config file:

log_file=log
hi_temp=25
lo_temp=10
correction=20

Otput:

Reading config...
Value inside clause: log
Value outside clause: 600Done.
###################################

How does this happen? - why 'log_file' value suddenly becomes 600 ?

[Salem]

> log_file=var_word;
1. var_word is a local variable, so even if it appeared to work, it would not survive the return from the function.
2. You only copy the pointer, not what it's pointing at. So any change to the data affects both pointers.

You need
char log_file[MAX_LINE_LENGTH];

Then
strcpy(log_file,var_word);

[seitan]

Thank you- this works fine.