kc3-lang/libbsd/reset_getopt.c

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• Hash : c849ba32
  Author :
  Date : 2006-02-13T09:02:17
  

  reset_getopt: New function (borrowed from e2fsprogs)
  

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• reset_getopt.c

• /*
   * util.c --- utilities for the debugfs program
   * 
   * Copyright (C) 1993, 1994 Theodore Ts'o.  This file may be
   * redistributed under the terms of the GNU Public License.
   *
   */
  
  /* Enable getopt variables */
  #ifndef _GNU_SOURCE
  # define _GNU_SOURCE 1
  #endif
  
  #include <unistd.h>
  
  /* FIXME */
  #ifndef __GLIBC__
  # define HAVE_OPTRESET 1
  #endif
  
  /*
   * This function resets the libc getopt() function, which keeps
   * internal state.  Bad design!  Stupid libc API designers!  No
   * biscuit!
   *
   * BSD-derived getopt() functions require that optind be reset to 1 in
   * order to reset getopt() state.  This used to be generally accepted
   * way of resetting getopt().  However, glibc's getopt()
   * has additional getopt() state beyond optind, and requires that
   * optind be set zero to reset its state.  So the unfortunate state of
   * affairs is that BSD-derived versions of getopt() misbehave if
   * optind is set to 0 in order to reset getopt(), and glibc's getopt()
   * will core ump if optind is set 1 in order to reset getopt().
   * 
   * More modern versions of BSD require that optreset be set to 1 in
   * order to reset getopt().   Sigh.  Standards, anyone?
   *
   * We hide the hair here.
   */
  void
  reset_getopt (void)
  {
  #ifdef __GLIBC__
    optind = 0;
  #else
    optind = 1;
  #endif
  #ifdef HAVE_OPTRESET
    optreset = 1;			/* Makes BSD getopt happy */
  #endif
  }
  

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