Mercurial > cpython-lru_cache-weakref

annotate Python/getopt.c @ 36664:7bfbfb2ef4e2 legacy-trunk

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Stop generating empty arrays.
author Martin v. Löwis <martin@v.loewis.de>
date Sun, 26 Feb 2006 23:40:20 +0000
parents a826a46bae54
children 2f3f2e32dfd9
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1 /*---------------------------------------------------------------------------*
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2 * <RCS keywords>
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3 *
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4 * C++ Library
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5 *
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6 * Copyright 1992-1994, David Gottner
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7 *
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8 * All Rights Reserved
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9 *
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10 * Permission to use, copy, modify, and distribute this software and its
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11 * documentation for any purpose and without fee is hereby granted,
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12 * provided that the above copyright notice, this permission notice and
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13 * the following disclaimer notice appear unmodified in all copies.
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14 *
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15 * I DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL I
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17 * BE LIABLE FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
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18 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER
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19 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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20 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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21 *
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22 * Nevertheless, I would like to know about bugs in this library or
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23 * suggestions for improvment. Send bug reports and feedback to
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24 * davegottner@delphi.com.
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25 *---------------------------------------------------------------------------*/
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26
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27 #include <stdio.h>
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28 #include <string.h>
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29
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30 int _PyOS_opterr = 1; /* generate error messages */
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31 int _PyOS_optind = 1; /* index into argv array */
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32 char *_PyOS_optarg = NULL; /* optional argument */
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33
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34 int _PyOS_GetOpt(int argc, char **argv, char *optstring)
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35 {
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36 static char *opt_ptr = "";
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37 char *ptr;
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38 int option;
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39
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40 if (*opt_ptr == '\0') {
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41
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42 if (_PyOS_optind >= argc || argv[_PyOS_optind][0] != '-' ||
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43 argv[_PyOS_optind][1] == '\0' /* lone dash */ )
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44 return -1;
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45
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46 else if (strcmp(argv[_PyOS_optind], "--") == 0) {
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47 ++_PyOS_optind;
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48 return -1;
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49 }
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50
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51 opt_ptr = &argv[_PyOS_optind++][1];
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52 }
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53
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54 if ( (option = *opt_ptr++) == '\0')
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55 return -1;
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56
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57 if ((ptr = strchr(optstring, option)) == NULL) {
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58 if (_PyOS_opterr)
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59 fprintf(stderr, "Unknown option: -%c\n", option);
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60
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61 return '?';
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62 }
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63
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64 if (*(ptr + 1) == ':') {
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65 if (*opt_ptr != '\0') {
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66 _PyOS_optarg = opt_ptr;
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67 opt_ptr = "";
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68 }
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69
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70 else {
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71 if (_PyOS_optind >= argc) {
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72 if (_PyOS_opterr)
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73 fprintf(stderr,
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74 "Argument expected for the -%c option\n", option);
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75 return '?';
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76 }
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78 _PyOS_optarg = argv[_PyOS_optind++];
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79 }
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80 }
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81
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82 return option;
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83 }