Thread: GETOPT() HElP!!!

My piece of code adding HTML tags to input of user. FOR example

4tab6tab7

gives me

`<tr><td>4<td><td>5<td><td>7<td></tr>`

But sometimes I can have headings which means that I have to add (in our example) `<tr><th>4<th><th>5<th><th>7<th></tr>` (td is changed to th).
I dont know how to make optional argument "-h num" (I run like "table -h3") which states how many lines at the beginning are "heading" lines; if this option is not present, it defaults to zero. I know that I have to use getopt(). But I dont know how to do it...Help me please....Thanks

Code:

 #include <stdio.h>
    
    enum ctypes {
        CHAR, BLANK, LINE, NTYPES
    };
    
    int type(int c)
    {
        return  c == '\n' ? LINE :  c ==  '\t';
    }
    
    int main(void)
    {
        static const struct t {
            const char *fmt;
            int state;
        } trans[][NTYPES] = {
            { { "<tr><td>%c", 1 }, { "", 0 }, { "", 0 } },
            { { "%c", 1 }, { "</td>", 2 }, { "</td></tr>\n", 0 } },
            { { "<td>%c", 1 }, { "", 2 }, { "</tr>\n", 0 } }
        };
        const struct t *tp;
     int c, state;
    
    //    puts("<table>");
        for (state = 0; (c = getchar()) != EOF; state = tp->state) {
            tp = trans[state] + type(c);
            printf(tp->fmt, c);
        }
      //  puts("</table>");}

yup, i do. I think I have to add while with getopt. But in the case I dont know how to show numbers of lines..

Originally Posted by Manu Lakaster

yup, i do. I think I have to add while with getopt. But in the case I dont know how to show numbers of lines..

You do? Nobody understands Barney McGrew code apart from Barney McGrew.

Originally Posted by SirPrattlepod

Nobody understands Barney McGrew code apart from Barney McGrew.

Even that is debatable at times .

@Manu Lakaster:
If you're waiting for another chunk of code you can copy-paste along Barney McGrew's state machine, you're out of luck. We don't generally hand out code here, you make an attempt, post it then we help you. The man page for getopt (link) has a good example on how to use the function, and Google will turn up several more.

The advice:
Use getopt() to parser the options (you need to change main to accept command line params, see our FAQ). Store the value you read in (e.g. the 3 in -h3) in a well-named int variable. Access that later when you need to know the value of the -h parameter.

Looks to be another case of homework by successive approximation...
c - GETOPT(). Help please - Stack Overflow