Function next_word

tests/rotctl_parse.c:439–523

* function to get the next word from the command line or from stdin * until stdin exhausted. stdin is read if the special token '-' is * found on the command line. * * returns EOF when words exhausted * returns <0 is error number * returns >=0 when successful */

 * returns >=0 when successful
 */
static int next_word(char *buffer, int argc, const char **argv, int newline)
{
    int ret;
    char c;
    static int reading_stdin;

    if (!reading_stdin)
    {
        if (optind >= argc)
        {
            return EOF;
        }
        else if (newline
                 && '-' == argv[optind][0]
                 && 1 == strlen(argv[optind]))
        {

            ++optind;
            reading_stdin = 1;
        }
    }

    if (reading_stdin)
    {
        do
        {
            do
            {
                ret = scanf(" %c%" STR(MAXARGSZ) "[^ \t\n#]", &c, &buffer[1]);
            }
            while (EINTR == ret);

            if (ret > 0 && '#' == c)
            {
                do
                {
                    ret = scanf("%*[^\n]");
                }
                while (EINTR == ret);   /* consume comments */

                ret = 0;
            }
        }
        while (!ret);

        if (EOF == ret)
        {
            reading_stdin = 0;
        }
        else if (ret < 0)
        {
            rig_debug(RIG_DEBUG_ERR, "scanf: %s\n", strerror(errno));
            reading_stdin = 0;
        }
        else
        {
            buffer[0] = c;
            buffer[1 == ret ? 1 : MAXARGSZ] = '\0';