topic Re: language and scripting in Operating System - HP-UX

language and scripting

Soumya Poddar — Fri, 09 Jul 2010 05:11:40 GMT

I am new in Unix
please forgive me if my question looks
very simple to you.

I am writing this

program in c
.....
while((c=getopt(..,..,..))!=-1)
{
...
...
......
}

but my two of my options in my program need more than two arguments
how do I do it please help.

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 07:54:46 GMT

#include
#include
main (int argc, char *argv[])
{
int c;
int bflg, aflg=0, errflg=0;
extern char *optarg;
char *ifile,*ofile;

extern int optind, optopt;
while ((c = getopt(argc, argv, ":abf:o:")) != -1)
switch (c) {
case 'a':
aflg++;
break;
case 'f':
ifile = optarg++;
if (optarg[0]=='-')
errflg++;
else
{
ofile = ++optarg;
optind++;
}
break;
case ':': /* -f or -o without arguments */
fprintf(stderr, "Option -%c requires an argument\n",
optopt);
errflg++;
break;
case '?':
fprintf(stderr, "Unrecognized option: - %c\n",
optopt);
errflg++;
}
if (errflg) {
fprintf(stderr, "usage: . . . ");
exit (2);
}
printf("f= %s..%s..%d\n",ifile,ofile,aflg);
for ( ; optind < argc; optind++)
printf("%d %s\n",optind,argv[optind]);
}

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 08:04:58 GMT

Thank you

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 09:55:46 GMT

sir
your program is not taking two arguments
i takes first arguments properly but for the second one the program takes it as a string except the first two charecters of the first argument..
I want to mean that

if input is

./a.out -f 4567 7890

the output gets
f= 4567..67..0

so it does not taking the second argument

please help sir

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 10:21:46 GMT

indeed it is
case 'f':
ifile = optarg;
if (optarg[0]=='-')
errflg++;
else
{
ofile = argv[ optind++];
}
break;

sorry

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 10:26:29 GMT

thank you
sir
it helps me a lot

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 10:41:26 GMT

actually here the getopt does not parse the argument by it-self fully
but our intervention is needed there
is there any way to avoid this
is there any function of technique is there

plese help me sir

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 10:50:01 GMT

can you clarify?
I am not sure I understand what you are trying to do.

just an example could help

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 10:55:49 GMT

actually

we write
while((c=getopt(...,...,":abc:")!=-1)
{
....
....
....
}

here the getopt can easily understand that the option c should need a argument with it
hence, it searchs for the argument when it sees the option -c in the string of one of it's strings stored in argv[] vector.

just like that do we have any other kind of option where the function it self searches for the two arguments or the argument list.

please help
sir

if u need any more clarification please reply me

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 11:07:36 GMT

I am sorry I don't follow

./a.out -f toto tata -c arg1 arg2 arg3 arg4 ... -z
you want to get the list of -c args?

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 11:20:48 GMT

yes
but using the function getopt itself

as using the getopt
for single argument we can get it using oparg

for the same thing using a list og arguments
can we get it using some standard syntax

plese reply sir

Re: language and scripting

Bill Hassell — Fri, 09 Jul 2010 11:27:35 GMT

> ./a.out -f toto tata -c arg1 arg2 arg3 arg4 ... -z
> you want to get the list of -c args?

The shell is separating each space-delimited string as a separate item for getopt. To supply multiple arguments to a single option, keep the arguments together. I like to use commas (more readable) or use quotes:

./a.out -f toto,tata -c arg1,arg2,arg3,arg4 ... -z

or

./a.out -f "toto tata" -c "arg1 arg2 arg3 arg4" ... -z

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 11:30:35 GMT

in that case is my program need to parse them
or these list of arguments will be passed to me through some standard external variable
like optagr

plese reply
sir

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 11:36:06 GMT

getopt stop to the first identified -x
now if optarg points to the first string after the identified option if there is a : in the description
optind points to the next arg

so to get a variable number of params you can do for instance:

char * v2;
char *allcparms[256];
int indexcparms=0;
......
case 'c':
allcparms[indexcparms++]=optarg;
while(v2=argv[optind])
{
if ( v2[0]=='-' ) break;
allcparms[indexcparms++]=v2;
optind++;
}
break;

so
./a.out -c 1 2 3 4 5 6 -f xx yy
will put 1 2 3 4 5 6 in allcparms[0..5]
./a.out -c 1 2 3 4 5 6
also
./a.out -c 1 2 3 4 5 6 -- xx yy
also

is it what you are trying to make?

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 11:37:54 GMT

in one of my previous answer I wrote:
if (optarg[0]=='-')
in fact it is if (argv[optind][0]=='-')

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 11:40:45 GMT

yes

but here in that case i parse those arguments using my programs

but i am asking that is there any standard function is there like getopt using which
i get my varriable number of arguments using some standard varriable like optarg in getopt

plese reply sir

Re: language and scripting

Laurent Menase — Fri, 09 Jul 2010 11:47:43 GMT

please give an example
I don't follow what you are trying to get and how?

are you trying to do it in script?

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 11:56:50 GMT

like
in C

while((c=getopt(...,...,":abf:"))!=-1)
{
.....
.....
.....
}

now if my input is
./a.out -f Mandoc.doc
we can get it like

ifile=optagr

but if we want to give the input like
./a.out -f Mandoc.doc Relese.doc .....

then is there any standard function which will
give same oppurtunity access those argument list

like
arguments=optargarr;

where
arguments is declared like

char* arguments[];

and optagr declared as

extern char* optarg[];

i want to use it in simple C program

Re: language and scripting

James R. Ferguson — Fri, 09 Jul 2010 12:02:32 GMT

Hi:

> but if we want to give the input like
./a.out -f Mandoc.doc Relese.doc .....

As Bill said, quote the argument and 'getopt()' will see it as one. I suspect that you come from Windows environments where spaces are common in filenames. Spaces (whitespace) in Unix separates arguments when the shell parses a command line/

Hence:

# ./a.out -f "Mandoc.doc Relese.doc"

...will leave you with *one* argument to the '-f' option.

Regards!

...JRF...

Re: language and scripting

Soumya Poddar — Fri, 09 Jul 2010 12:09:09 GMT

ya
I am a fresher i am new in company and i am new in unix i came from windows enviourment

so hence
we have make our program in such a way that it can parse the arguments by it self

and there is no way to parse multiple arguments uning getopt() in c

ok sir thank you
for helping me
and shareing your knowladge with me

thank you