Thread: HELP with READLINE.H

Hello again

Is possible to know how many args has been introduced by the user, without making any functions to do that, simple using my code:

Code:

char *s ;
	int n = 0, q = 0 ;
	int x,y;
	char *c,*nome_f,e;

	c = (char*) malloc(25 * sizeof(char)); 
	nome_f = (char*) malloc(25 * sizeof(char));

	read_history("historico"); 
	using_history(); 
	do {  
  		s = readline("Letrorium>");  
		if ( *s != 'q' ) {
/*AT THIS POINT I WANT KNOW HOW MANY ARGS HAS BEEN INTRODUCED (2, 3 ,4 MORE... SEPARATED BY SPACES);
			add_history(s);
       			n++;

Thanks in advanced

You can find the number of command line arguments passed by the user using argc variable.

I know i can use argc to know the number of args. But i already try to put like so many examples over internet and always count wrong args.

Show an example, and we'll see if we can't correct it. Hard to believe we couldn't get this right! This is a standard parameter, and used all the time, so it's better to use it, than to try and work out your own code for it.

Here is an sample example.

Code:

#include<stdio.h>
#include <readline/readline.h>
#include <readline/history.h>
int main(int argc,char *argv[])
{
char *s;
s = readline("Letters>");
printf("number of args: %d\n",argc);
}

Remember that the first element in argv is a pointer to the name of the program. This is also included in the parameter count variable argc. The count will always be 1 (for the name of the application) even if you don't specify parameters. If you specify one parameter argc will be 2, etc.

Yes DeadPlanet i know that also.

But my program stays always with the prompt of readline "Letters:>" and i need to count argc in this.

If i put ./Letters testing, argc will be 2 and so on. After i put this my prompt changes to Letters and the user is able to put many comands inside to execute some jobs (this is my problem).

Yes Adak.

When i run my program the prompt changes to Letters, because i'am using readline.h
After the user should give me some comands that my program executes, but i want to check how many args as been inserted so if he puts more then my autorization sayz "INVALID NUMBER OF ARGS", if he puts 2 i do somethings, if he puts 4 i do another thing and so on.

Thks

So what they type doesn't go into argv/argc. What they type goes into s. If you want to know how many letters they typed, I suppose you can use strlen (although I have no idea whether readline gives you \n at the end of the string or not). If you want to know how many words they typed you'll have to parse that string, looking for spaces.

Thanks tabstop.

That the way i already do the job.

I just was looking for an better way. I don't really know if argv and argc can be used in readline.

Thanks anyway