C function to split a line into cmd, val

configfile.c

/*
 * written by kyle isom <[email protected]>
 * license: isc / public domain dual license
 * one of the functions i wrote for the lurker project
 * (https://github.com/kisom/lurker)
 *
 * C function to split a line into command and value
 */

/*
 * Internal function to split a line into command and value
 *     arguments:
 *         - line: a line of text. in lurker, this is already guaranteed
 *           to be an allocated buffer with a line of text in it, and it
 *           is guaranteed not to have any newlines or carriage returns. 
 *           if it is used elsewhere, it may need to be tweaked.
 *         - a pointer to a char pointer, this should be a char * in the 
 *           caller. this will be allocated with the proper amount of memory
 *           and needs to be freed by the caller. this is used to store the
 *           command.
 *         - a pointer to a char pointer, this should be a char * in the 
 *           caller. this will be allocated with the proper amount of memory
 *           and needs to be freed by the caller. this is used to store the
 *           value of the command.
 *         - a const char that contains the character used to demarcate command
 *           and value.
 *     returns:
 *         - EXIT_FAILURE on function failure (i.e. malloc error, or the
 *           line doesn't look like a command)
 *         - EXIT_SUCCESS if it looks like all went well
 * 
 * an example line looks like "server: irc.example.net", cmd will have "server" 
 * and val will have "irc.example.net".
*/

int 
parse_simple(char *line, char **cmd, char **val, const char split_ch)
{
        size_t line_sz, i;

        i = 0;
        line_sz = strlen(line);

        for (i = 0; '\0' != line[i]; ++i)
            if (split_ch == line[i])
                break;

        if (i == line_sz)
            return EXIT_FAILURE;

        *cmd = calloc(i + 1, sizeof(char));
        *val = calloc(line_sz - i + 1, sizeof(char));
        if ((NULL == cmd) || (NULL == val))
            return EXIT_FAILURE;

        /* Increment i after copy to move past the split character. */
        STRCPY(*cmd, line, i++);
        STRCPY(*val, line +i, line_sz - i);

        return EXIT_SUCCESS;
}