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annotate fluid-mnf/getopt.h @ 378:82fb5a70c9fd

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compal/audio: results of simple experiments
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Oct 2021 23:20:00 +0000
parents 9cecc930d78f
children
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311
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1 /* Declarations for getopt.
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2 Copyright (C) 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify it
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5 under the terms of the GNU General Public License as published by the
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6 Free Software Foundation; either version 2, or (at your option) any
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7 later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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17
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18 #ifndef _GETOPT_H
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19 #define _GETOPT_H 1
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20
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21 #ifdef __cplusplus
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22 extern "C" {
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23 #endif
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24
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25 /* For communication from `getopt' to the caller.
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26 When `getopt' finds an option that takes an argument,
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27 the argument value is returned here.
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28 Also, when `ordering' is RETURN_IN_ORDER,
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29 each non-option ARGV-element is returned here. */
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30
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31 extern char *optarg;
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32
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33 /* Index in ARGV of the next element to be scanned.
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34 This is used for communication to and from the caller
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35 and for communication between successive calls to `getopt'.
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36
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37 On entry to `getopt', zero means this is the first call; initialize.
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38
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39 When `getopt' returns EOF, this is the index of the first of the
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40 non-option elements that the caller should itself scan.
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41
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42 Otherwise, `optind' communicates from one call to the next
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43 how much of ARGV has been scanned so far. */
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44
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45 extern int optind;
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46
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47 /* Callers store zero here to inhibit the error message `getopt' prints
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48 for unrecognized options. */
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49
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50 extern int opterr;
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51
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52 /* Set to an option character which was unrecognized. */
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53
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54 extern int optopt;
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55
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56 /* Describe the long-named options requested by the application.
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57 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
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58 of `struct option' terminated by an element containing a name which is
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59 zero.
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60
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61 The field `has_arg' is:
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62 no_argument (or 0) if the option does not take an argument,
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63 required_argument (or 1) if the option requires an argument,
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64 optional_argument (or 2) if the option takes an optional argument.
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65
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66 If the field `flag' is not NULL, it points to a variable that is set
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67 to the value given in the field `val' when the option is found, but
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68 left unchanged if the option is not found.
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69
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70 To have a long-named option do something other than set an `int' to
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71 a compiled-in constant, such as set a value from `optarg', set the
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72 option's `flag' field to zero and its `val' field to a nonzero
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73 value (the equivalent single-letter option character, if there is
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74 one). For long options that have a zero `flag' field, `getopt'
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75 returns the contents of the `val' field. */
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76
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77 struct option
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78 {
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79 #if __STDC__
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80 const char *name;
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81 #else
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82 char *name;
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83 #endif
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84 /* has_arg can't be an enum because some compilers complain about
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85 type mismatches in all the code that assumes it is an int. */
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86 int has_arg;
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87 int *flag;
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88 int val;
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89 };
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90
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91 /* Names for the values of the `has_arg' field of `struct option'. */
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92
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93 #define no_argument 0
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94 #define required_argument 1
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95 #define optional_argument 2
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96
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97 /* Josh's comment: many GNU developers are ignorant of C++ */
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98
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99 /* Many other libraries have conflicting prototypes for getopt, with
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100 differences in the consts, in stdlib.h. To avoid compilation
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101 errors, only prototype getopt for the GNU C library. */
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102 extern int getopt (int , char *const *, const char *);
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103 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
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104 const struct option *longopts, int *longind);
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105 extern int getopt_long_only (int argc, char *const *argv,
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106 const char *shortopts,
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107 const struct option *longopts, int *longind);
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108
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109 /* Internal only. Users should not call this directly. */
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110 extern int _getopt_internal (int argc, char *const *argv,
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111 const char *shortopts,
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112 const struct option *longopts, int *longind,
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113 int long_only);
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114
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115 #ifdef __cplusplus
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116 }
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117 #endif
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118
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119 #endif /* _GETOPT_H */