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 #include <stdio.h>
  28 #include <string.h>
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 int _PyOS_opterr = 1;          /* generate error messages */
  35 int _PyOS_optind = 1;          /* index into argv array   */
  36 char *_PyOS_optarg = NULL;     /* optional argument       */
  37
  38 int _PyOS_GetOpt(int argc, char **argv, char *optstring)
  39 {
  40         static char *opt_ptr = "";
  41         char *ptr;
  42         int option;
  43
  44         if (*opt_ptr == '\0') {
  45
  46                 if (_PyOS_optind >= argc || argv[_PyOS_optind][0] != '-' ||
  47                     argv[_PyOS_optind][1] == '\0' /* lone dash */ )
  48                         return -1;
  49
  50                 else if (strcmp(argv[_PyOS_optind], "--") == 0) {
  51                         ++_PyOS_optind;
  52                         return -1;
  53                 }
  54
  55                 opt_ptr = &argv[_PyOS_optind++][1];
  56         }
  57
  58         if ( (option = *opt_ptr++) == '\0')
  59                 return -1;
  60
  61         if ((ptr = strchr(optstring, option)) == NULL) {
  62                 if (_PyOS_opterr)
  63                         fprintf(stderr, "Unknown option: -%c\n", option);
  64
  65                 return '?';
  66         }
  67
  68         if (*(ptr + 1) == ':') {
  69                 if (*opt_ptr != '\0') {
  70                         _PyOS_optarg  = opt_ptr;
  71                         opt_ptr = "";
  72                 }
  73
  74                 else {
  75                         if (_PyOS_optind >= argc) {
  76                                 if (_PyOS_opterr)
  77                                         fprintf(stderr,
  78                             "Argument expected for the -%c option\n", option);
  79                                 return '?';
  80                         }
  81
  82                         _PyOS_optarg = argv[_PyOS_optind++];
  83                 }
  84         }
  85
  86         return option;
  87 }
  88
  89 #ifdef __cplusplus
  90 }
  91 #endif
  92