process_args.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

#include <stdio.h>
#include <stdlib.h>
void process_args(int argc, char **argv,char *docstring){
  if (argc > 1 && argv[1][0]=='-' && argv[1][1]=='h') {
    fprintf(stderr,docstring);  
    fprintf(stderr,"\n\nusage: %s [infile] [outfile]\n",argv[0]);
    exit(1); 	
  }

  if (argc > 1){
    freopen(argv[1],"r",stdin);
  }
  
  if (argc > 2){
    freopen(argv[2],"w",stdout);
  }
    
}