获取命令行元素并将其存储到数组中

Question

I am trying to implement the Unix command "tar" in C. It will be executed using the command p5a -c archive infile1 infile2 ... infilek where the arguments infile1, infile2, ..., infilek denote the names of the files which must be combined to create the archive. I am having trouble getting the file names from the command line and storing them into an array. Any help would be appreciated. Thanks!

Answer 1

I really should not be spoon-feeding what looks like a homework question, but its been 2 years since I last touched gcc and need some practice.

On one hand, it looks like you are capable of using argc to get the data you want. The problem is 'how to know' the number of arguments. Most people use argv for that. Just made the following with Visual Studio 2010,

#include<stdio.h>
#include<conio.h>

int main(int argv, char *argc[])
{
    int i = 1;
    printf("Your arguments are:\n");
    for (i=0; i<argv; i++)
    {
        printf("%s\n",argc[i]);
    }   
    return 0;
}

And here is some sample output (Win7 command line),

C:\...\Debug>C_hello.exe this is a string of input
Your arguments are:
C_hello.exe
this
is
a
string
of
input

C:\...\Debug>

I expect you'll get similar results with gcc in linux as well.

EDIT: Did some searching on the matter. Looks like there's a standard linux library for this sort of thing, getopt

See the example on that page. Very well explained.