🚀 go-pugleaf

There are a couple of tools that will do the parsing for you and
fill out a data structure with the results.  Genparse is one
http://genparse.sf.net

On 14 Apr 2002 02:32:54 -0700, Tarek <tabuelnaga@hotmail.com> wrote:
> --> I'm not sure what you really need .. But anyway, 
> C uses argc and argv to parse the command line .. 
> This means that you need to include them in your code 
> main (int argc, char *argv[])
> If your program's name is "utility" and you type just utility, this
> means that you have argc=1 and argv[0]= utility
> --------------------------------------------------------
> One simple way to do something like that ..
> #include <stdio.h>
> int main(int argc, char *argv[])
> {
>    int i ;
>    struct param
>    {
>       char option[20] ;
>       char value[20] ;
>    } ;
> 
>    struct param my_param ;
> 
>    if (argc > 1)
>    {
>       for (i = 1 ; i < argc ; i=i+2)
>       {
>          strcpy(my_param.option,argv[i]) ;
>          strcpy(my_param.value,argv[i+1]) ;
>          /* write whatever you want here to make use of the parameters
>             user send on the command line 
>             If the user writes  > utility -option1 value
>             then you have my_param.option = -option1
>             and my_param.value = value
>  
>             you can also make an array of this structure if you expect
>             many arguments to be sent ! 
>          */
>       }
>    }
> }
> 
> Hope, this help you .. ! :)
> 
> T.N.
> ----------------------------------------------------
> 
> gnuist007@hotmail.com (gnuist) wrote in message news:<9e8ebeb2.0204131900.67ea8c47@posting.google.com>...
>> Suppose that I am writing a utility
>> 
>> utility [-mode1 <24|124>] [-mode2 [67]]
>> 
>> so if I am correct in using the BNF notation, [] denotes optional arguments
>> and <> denotes mandatory arguments. The command egrep in linux has alternate
>> patterns for searching specified by the vertical stroke, "|" as we have used
>> for mode number one for this utility. I have used numbers as the arguments
>> to the switches to show this possibility.
>> 
>> I have to parse this command line via *argv[] and argc.
>> Please show how to approach it. For example, what argc will different
>> arguments give? 
>> 
>> utility -mode1 "24|214"
>> utility -mode1  24|214
>> utility -mode2  24
>> utility -mode2 "24" -mode2 67
>> 
>> and how will we deal with conflicting arguments? Is there are uniform and
>> professional method of approaching this problem? I am not a CS and hardly
>> know the finite state machines but if you are kind enough to put some examples
>> to plant the ideas, would be very grateful and finish this work. I do have
>> the dragon book.
>> 
>> I am posting this to C/C++ because they are the languages of implementation
>> and unix because they also deal with it and GNU compatible utilities require
>> robust and unambiguous command line interface as a basic requirement to 
>> consider any to be considered gnuable.
>> 
>> Thanks a lot for any help and hope to give you some good utilities in return!!!


-- 

Mike Borella
cathmike@xnet.com
http://www.borella.net