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getopt.c

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

/*
 * Here's something you've all been waiting for:  the AT&T public domain
 * source for getopt(3).  It is the code which was given out at the 1985
 * UNIFORUM conference in Dallas.  I obtained it by electronic mail
 * directly from AT&T.  The people there assure me that it is indeed
 * in the public domain.
 * 
 * There is no manual page.  That is because the one they gave out at
 * UNIFORUM was slightly different from the current System V Release 2
 * manual page.  The difference apparently involved a note about the
 * famous rules 5 and 6, recommending using white space between an option
 * and its first argument, and not grouping options that have arguments.
 * Getopt itself is currently lenient about both of these things White
 * space is allowed, but not mandatory, and the last option in a group can
 * have an argument.  That particular version of the man page evidently
 * has no official existence, and my source at AT&T did not send a copy.
 * The current SVR2 man page reflects the actual behavor of this getopt.
 * However, I am not about to post a copy of anything licensed by AT&T.
 */

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

/*LINTLIBRARY*/
#ifndef NULL
#define NULL    0
#endif
#define EOF     (-1)


int     opterr = 1;
int     optind = 1;
int     optopt;
char    *optarg;

void ERR(char *s, char c, char **argv)  
{
      if(opterr)
      {
            char errbuf[2];
            errbuf[0] = c;
            errbuf[1] = '\n';
            /* (void) write(2, argv[0], (unsigned)strlen(argv[0]));
            (void) write(2, s, (unsigned)strlen(s));
            (void) write(2, errbuf, 2); */
            (void) fwrite(argv[0], (unsigned)strlen(argv[0]),1,stderr);
            (void) fwrite(s, (unsigned)strlen(s),1,stderr);
            (void) fwrite(errbuf, 2, 1,stderr); 
      }
}

char *index2(char *str, char c)
{
      char *ret;
      ret=strchr(str,c);
      return(ret);
}


int getoptions(int argc, char **argv, char *opts)
{
      static int sp = 1;
      register int c;
      register char *cp;

      if(sp == 1)
            if(optind >= argc ||
               argv[optind][0] != '-' || argv[optind][1] == '\0')
                  return(EOF);
            else if(strcmp(argv[optind], "--") == 0) {
                  optind++;
                  return(EOF);
            }
      optopt = c = argv[optind][sp];
      if(c == ':' || (cp=index2(opts, c)) == NULL) {
            ERR(": illegal option -- ", c,argv);
            if(argv[optind][++sp] == '\0') {
                  optind++;
                  sp = 1;
            }
            return('?');
      }
      if(*++cp == ':') {
            if(argv[optind][sp+1] != '\0')
                  optarg = &argv[optind++][sp+1];
            else if(++optind >= argc) {
                  ERR(": option requires an argument -- ", c,argv);
                  sp = 1;
                  return('?');
            } else
                  optarg = argv[optind++];
            sp = 1;
      } else {
            if(argv[optind][++sp] == '\0') {
                  sp = 1;
                  optind++;
            }
            optarg = NULL;
      }
      return(c);
}

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