flags.c

#ifdef __ORCAC__
#pragma optimize 79
#pragma noroot
#endif

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "flags.h"

// like getopt.

Flags flags;


void help(void)
{
  fputs("gopher [options] url\n", stdout);
  fputs("-h         display help information.\n", stdout);
  fputs("-V         display version information.\n", stdout);
  fputs("-i         display http headers.\n", stdout);  
  fputs("-I         http HEAD\n", stdout);
  fputs("-O         write output to file.\n", stdout);
  fputs("-o <file>  write output to <file> instead of stdout.\n", stdout);
  fputs("-0         use HTTP 1.0\n", stdout);
  fputs("-9         use HTTP 0.9\n", stdout);
  fputs("\n", stdout);
  
  exit(0);
}

int ParseFlags(int argc, char **argv)
{
    char *cp;
    char c;
    int i;
    int j;
    
    memset(&flags, 0, sizeof(flags));

    for (i = 1; i < argc; ++i)
    {    
        cp = argv[i];
        
        c = cp[0];
        
        if (c != '-')
            return i;
        
        // -- = end of options.
        if (cp[1] == '-' && cp[2] == 0)
            return i + 1;
        
     
        // now scan all the flags in the string...
        for (j = 1; ; ++j)
        {
            int skip = 0;
            
            c = cp[j];
            if (c == 0) break;
            
            switch (c)
            {
            case 'h':
                help();
                break;
                
            case 'i':
                flags._i = 1;
                break;
                
            case 'I':
                flags._I = 1;
                break;
            
            case 'O':
                flags._O = 1;
                flags._o = 0;
                break;
            
            case 'v':
                flags._v = 1;
                break;
                
            case 'V':
                flags._V = 1;
                break;
            
            case '0':
                flags._0 = 1;
                flags._9 = 0;
                break;
                
            case '9':
                flags._9 = 1;
                flags._0 = 0;
                break;
            
            // take an argument...
            // -oarg or -o arg
            case 'o':
                flags._O = 0;
                skip = 1;
                if (cp[j + 1])
                    flags._o = cp + j + 1;
                else
                {
                    if (++i >= argc)
                    {
                        fprintf(stderr, "option requires an argument -- %c\n", c); 
                        return -1;
                    }
                    flags._o = argv[i];
                }
                break;
            default:
                fprintf(stderr, "illegal option -- %c\n", c);
                return -1; 
            }
            
            if (skip) break;
        }
        
        
        
    
    }
    

    return i;
}