structure member allocation

From: Aaron Walker (ka0ttic_at_REMOVETHIScfl.rr.com)
Date: 11/29/03

  • Next message: nrk: "Re: structure member allocation" 
    Date: Sat, 29 Nov 2003 02:05:53 GMT

    I am trying to write this piece of code that reads a config file, in the
    format:

    ENTRY value

    and I want to read the config file, then read the "value" into the
    appropriate member of the following structure:

    struct conf_data {
            char *root;
            char *pid_file;
            char *log_dir;
            char *local_addr;
            unsigned int port;
            unsigned short child_min;
            unsigned short child_max;
    };

    typedef struct conf_data Config;

    I want the 4 char pointers to be dynamically allocated at runtime,
    depending on the length of the "value" in the config file.

    I have a fuction, get_conf_data that is run from main():

    Config *get_conf_data(void)
    {
            Config *conf;
            ...
            return conf;
    }

    My question is, do I need to allocate memory for the structure first
    then the members, like:

    conf = malloc(sizeof(Config));
    conf->root = malloc(strlen(this_value));
    conf->pid_file = malloc(strlen(that_value));

    if I do need to do that way, then when I am free()ing, do I do it in the
    opposite order?

    int main()
    {
            Config *conf = get_conf_data();
            ...
            free(conf->root);
            free(conf->pid_file);
            ...
            free(conf);
    }

    Or am I totally off-base here?

    Thanks,
    Aaron

  • Next message: nrk: "Re: structure member allocation"

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