[rtl] Command line arguments

[Phil Daly]

I am trying to pass command line arguments into a module (doesn't have to be
a real time module, of course). I can get around the well-known problem of
not being able to pass numeric values by hiding them in strings. The question
is how to convert them back after - atoi does not work in the module.

To run the code (after compiling it):

  % insmod args arg1='dset=1024' arg2='freq=256' arg3='rate=8' arg4='time=4'

Here's the code

#include <linux/kernel.h>  /* printk */
#include <linux/module.h>  /* module stuff */
#include <stdlib.h>        /* atoi */

char *arg1 = "";
char *arg2 = "";
char *arg3 = "";
char *arg4 = "";
int dset = 0;
int freq = 0;
int rate = 0;
int time = 0;

int cliParse( char *ptr )
{
  switch (ptr[0]) {
    case 'd':
    case 'D':
      while ( *ptr != '=' ) ptr++;
       ptr++;
      /* 
         the following line fails - why?0
         dset = atoi( ptr );
         (void) printk("Decoded value = %d\n", dset);
      */
      ptr++;
      (void) printk("Dset: %s\n",ptr);
      break;
    case 'f':
    case 'F':
      (void) printk("Freq: %s\n",ptr);
      break;
    case 'r':
    case 'R':
      (void) printk("Rate: %s\n",ptr);
      break;
    case 't':
    case 'T':
      (void) printk("Time: %s\n",ptr);
      break;
  }
  return (0);
}

int init_module( void )
{
  (void) cliParse(arg1);
  (void) cliParse(arg2);
  (void) cliParse(arg3);
  (void) cliParse(arg4);
  return (0);
}

void cleanup_module( void )
{
}
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