AppPkg/Applications/Python/Python-2.7.10/Python/getopt.c

   1 /*---------------------------------------------------------------------------*
   2  * <RCS keywords>
   3  *
   4  * C++ Library
   5  *
   6  * Copyright 1992-1994, David Gottner
   7  *
   8  *                    All Rights Reserved
   9  *
  10  * Permission to use, copy, modify, and distribute this software and its
  11  * documentation for any purpose and without fee is hereby granted,
  12  * provided that the above copyright notice, this permission notice and
  13  * the following disclaimer notice appear unmodified in all copies.
  14  *
  15  * I DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL I
  17  * BE LIABLE FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
  18  * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER
  19  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  20  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  * Nevertheless, I would like to know about bugs in this library or
  23  * suggestions for improvment.  Send bug reports and feedback to
  24  * davegottner@delphi.com.
  25  *---------------------------------------------------------------------------*/
  26
  27 /* Modified to support --help and --version, as well as /? on Windows
  28  * by Georg Brandl. */
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 int _PyOS_opterr = 1;          /* generate error messages */
  38 int _PyOS_optind = 1;          /* index into argv array   */
  39 char *_PyOS_optarg = NULL;     /* optional argument       */
  40 static char *opt_ptr = "";
  41
  42 void _PyOS_ResetGetOpt(void)
  43 {
  44     _PyOS_opterr = 1;
  45     _PyOS_optind = 1;
  46     _PyOS_optarg = NULL;
  47     opt_ptr = "";
  48 }
  49
  50 int _PyOS_GetOpt(int argc, char **argv, char *optstring)
  51 {
  52     char *ptr;
  53     int option;
  54
  55     if (*opt_ptr == '\0') {
  56
  57         if (_PyOS_optind >= argc)
  58             return -1;
  59 #ifdef MS_WINDOWS
  60         else if (strcmp(argv[_PyOS_optind], "/?") == 0) {
  61             ++_PyOS_optind;
  62             return 'h';
  63         }
  64 #endif
  65
  66         else if (argv[_PyOS_optind][0] != '-' ||
  67                  argv[_PyOS_optind][1] == '\0' /* lone dash */ )
  68             return -1;
  69
  70         else if (strcmp(argv[_PyOS_optind], "--") == 0) {
  71             ++_PyOS_optind;
  72             return -1;
  73         }
  74
  75         else if (strcmp(argv[_PyOS_optind], "--help") == 0) {
  76             ++_PyOS_optind;
  77             return 'h';
  78         }
  79
  80         else if (strcmp(argv[_PyOS_optind], "--version") == 0) {
  81             ++_PyOS_optind;
  82             return 'V';
  83         }
  84
  85
  86         opt_ptr = &argv[_PyOS_optind++][1];
  87     }
  88
  89     if ((option = *opt_ptr++) == '\0')
  90         return -1;
  91
  92     if (option == 'J') {
  93         if (_PyOS_opterr)
  94             fprintf(stderr, "-J is reserved for Jython\n");
  95         return '_';
  96     }
  97
  98     if (option == 'X') {
  99         if (_PyOS_opterr)
 100             fprintf(stderr,
 101                 "-X is reserved for implementation-specific arguments\n");
 102         return '_';
 103     }
 104
 105     if ((ptr = strchr(optstring, option)) == NULL) {
 106         if (_PyOS_opterr)
 107             fprintf(stderr, "Unknown option: -%c\n", option);
 108
 109         return '_';
 110     }
 111
 112     if (*(ptr + 1) == ':') {
 113         if (*opt_ptr != '\0') {
 114             _PyOS_optarg  = opt_ptr;
 115             opt_ptr = "";
 116         }
 117
 118         else {
 119             if (_PyOS_optind >= argc) {
 120                 if (_PyOS_opterr)
 121                     fprintf(stderr,
 122                         "Argument expected for the -%c option\n", option);
 123                 return '_';
 124             }
 125
 126             _PyOS_optarg = argv[_PyOS_optind++];
 127         }
 128     }
 129
 130     return option;
 131 }
 132
 133 #ifdef __cplusplus
 134 }
 135 #endif
 136