getopt.c

来自「基于稀疏网络的精选机器学习模型」· C语言 代码 · 共 45 行

/*************************************************************************/
/*                                                                       */
/*  This file is included in case your version of Unix doesn't include   */
/*  the getopt utility.  If it does, discard this file and amend the     */
/*  Makefile accordingly.                                                */
/*                                                                       */
/*  There is no copyright on this file.                                  */
/*                                                                       */
/*************************************************************************/


#include <stdio.h>


int optind = 1;
char* optarg;


char getopt(int Argc, char** Argv, char* Str)
{
  char Optchar;
  char* Option;

  if ( optind >= Argc ) return EOF;

  Option = Argv[optind++];

  if ( *Option++ != '-' ) return '?';

  Optchar = *Option++;

  while ( *Str && *Str != Optchar ) Str++;
  if ( ! *Str ) return '?';

  if ( *++Str == ':' )
  {
    if ( *Option ) optarg = Option;
    else
      if ( optind < Argc ) optarg = Argv[optind++];
      else Optchar = '?';
  }

  return Optchar;
}