/*
 * Convert a string to its hexadecimal representation.
 *
 * Use like this:
 * log_write(0, LOG_MAIN, "DEBUG: %s", string2hex(var, var_len));
*/
char *string2hex(unsigned char *input, size_t length) {
    const int growth = 3;
    char *outstring = store_get(growth * length + 1);
    memset(outstring, 0, 3 * length + 1);
    for (int i = 0; i < length; i++) {
        sprintf(outstring + i * growth, "%02x ", input[i]);
    }
    return outstring;
}

/*
 * How to debug this library:
 *
 * 1. Add this code to the first “breakpoint”:
 *    log_write(0, LOG_MAIN, "pid: %d", getpid()); int busywait = 0; while (busywait == 0) {}
 * 2. Compile.
 * 3. Run “exim -be […]” to call the lib; see test_libexim-encrypt-dlfunc.sh for details.
 * 4. Read exim pid from log output. Attach to the looping exim process with “gdb -p PID”
 * 5. Prepare breakpoints, watches, etc. Set busywait to 1 and continue.
 */