| 1 | /* Declarations for getopt. |
| 2 | Copyright (C) 1989-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | NOTE: The canonical source of this file is maintained with the GNU C Library. |
| 5 | Bugs can be reported to bug-glibc@gnu.org. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify it |
| 8 | under the terms of the GNU General Public License as published by the |
| 9 | Free Software Foundation; either version 2, or (at your option) any |
| 10 | later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, |
| 20 | USA. */ |
| 21 | |
| 22 | #ifndef _GETOPT_H |
| 23 | #define _GETOPT_H 1 |
| 24 | |
| 25 | #ifdef __cplusplus |
| 26 | extern "C" { |
| 27 | #endif |
| 28 | |
| 29 | /* For communication from `getopt' to the caller. |
| 30 | When `getopt' finds an option that takes an argument, |
| 31 | the argument value is returned here. |
| 32 | Also, when `ordering' is RETURN_IN_ORDER, |
| 33 | each non-option ARGV-element is returned here. */ |
| 34 | |
| 35 | extern char *optarg; |
| 36 | |
| 37 | /* Index in ARGV of the next element to be scanned. |
| 38 | This is used for communication to and from the caller |
| 39 | and for communication between successive calls to `getopt'. |
| 40 | |
| 41 | On entry to `getopt', zero means this is the first call; initialize. |
| 42 | |
| 43 | When `getopt' returns -1, this is the index of the first of the |
| 44 | non-option elements that the caller should itself scan. |
| 45 | |
| 46 | Otherwise, `optind' communicates from one call to the next |
| 47 | how much of ARGV has been scanned so far. */ |
| 48 | |
| 49 | extern int optind; |
| 50 | |
| 51 | /* Callers store zero here to inhibit the error message `getopt' prints |
| 52 | for unrecognized options. */ |
| 53 | |
| 54 | extern int opterr; |
| 55 | |
| 56 | /* Set to an option character which was unrecognized. */ |
| 57 | |
| 58 | extern int optopt; |
| 59 | |
| 60 | /* Describe the long-named options requested by the application. |
| 61 | The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector |
| 62 | of `struct option' terminated by an element containing a name which is |
| 63 | zero. |
| 64 | |
| 65 | The field `has_arg' is: |
| 66 | no_argument (or 0) if the option does not take an argument, |
| 67 | required_argument (or 1) if the option requires an argument, |
| 68 | optional_argument (or 2) if the option takes an optional argument. |
| 69 | |
| 70 | If the field `flag' is not NULL, it points to a variable that is set |
| 71 | to the value given in the field `val' when the option is found, but |
| 72 | left unchanged if the option is not found. |
| 73 | |
| 74 | To have a long-named option do something other than set an `int' to |
| 75 | a compiled-in constant, such as set a value from `optarg', set the |
| 76 | option's `flag' field to zero and its `val' field to a nonzero |
| 77 | value (the equivalent single-letter option character, if there is |
| 78 | one). For long options that have a zero `flag' field, `getopt' |
| 79 | returns the contents of the `val' field. */ |
| 80 | |
| 81 | struct option |
| 82 | { |
| 83 | #if defined (__STDC__) && __STDC__ |
| 84 | const char *name; |
| 85 | #else |
| 86 | char *name; |
| 87 | #endif |
| 88 | /* has_arg can't be an enum because some compilers complain about |
| 89 | type mismatches in all the code that assumes it is an int. */ |
| 90 | int has_arg; |
| 91 | int *flag; |
| 92 | int val; |
| 93 | }; |
| 94 | |
| 95 | /* Names for the values of the `has_arg' field of `struct option'. */ |
| 96 | |
| 97 | #define no_argument 0 |
| 98 | #define required_argument 1 |
| 99 | #define optional_argument 2 |
| 100 | |
| 101 | #if defined (__STDC__) && __STDC__ |
| 102 | /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1. If it is |
| 103 | undefined, we haven't run the autoconf check so provide the |
| 104 | declaration without arguments. If it is 0, we checked and failed |
| 105 | to find the declaration so provide a fully prototyped one. If it |
| 106 | is 1, we found it so don't provide any declaration at all. */ |
| 107 | #if !HAVE_DECL_GETOPT |
| 108 | #if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT) |
| 109 | /* Many other libraries have conflicting prototypes for getopt, with |
| 110 | differences in the consts, in unistd.h. To avoid compilation |
| 111 | errors, only prototype getopt for the GNU C library. */ |
| 112 | extern int getopt (int argc, char *const *argv, const char *shortopts); |
| 113 | #else |
| 114 | #ifndef __cplusplus |
| 115 | extern int getopt (); |
| 116 | #endif /* __cplusplus */ |
| 117 | #endif |
| 118 | #endif /* !HAVE_DECL_GETOPT */ |
| 119 | |
| 120 | extern int getopt_long (int argc, char *const *argv, const char *shortopts, |
| 121 | const struct option *longopts, int *longind); |
| 122 | extern int getopt_long_only (int argc, char *const *argv, |
| 123 | const char *shortopts, |
| 124 | const struct option *longopts, int *longind); |
| 125 | |
| 126 | /* Internal only. Users should not call this directly. */ |
| 127 | extern int _getopt_internal (int argc, char *const *argv, |
| 128 | const char *shortopts, |
| 129 | const struct option *longopts, int *longind, |
| 130 | int long_only); |
| 131 | #else /* not __STDC__ */ |
| 132 | extern int getopt (); |
| 133 | extern int getopt_long (); |
| 134 | extern int getopt_long_only (); |
| 135 | |
| 136 | extern int _getopt_internal (); |
| 137 | #endif /* __STDC__ */ |
| 138 | |
| 139 | #ifdef __cplusplus |
| 140 | } |
| 141 | #endif |
| 142 | |
| 143 | #endif /* getopt.h */ |