Benny Prijono | 0a749f1 | 2005-10-31 21:02:30 +0000 | [diff] [blame^] | 1 | /* $Header: /pjproject/pjsip/src/pjsua/getopt.h 3 5/05/05 11:43p Bennylp $ */
|
| 2 | /* Declarations for getopt.
|
| 3 | Copyright (C) 1989,90,91,92,93,94,96,97,98 Free Software Foundation, Inc.
|
| 4 | This file is part of the GNU C Library.
|
| 5 |
|
| 6 | The GNU C Library is free software; you can redistribute it and/or
|
| 7 | modify it under the terms of the GNU Library General Public License as
|
| 8 | published by the Free Software Foundation; either version 2 of the
|
| 9 | License, or (at your option) any later version.
|
| 10 |
|
| 11 | The GNU C Library is distributed in the hope that it will be useful,
|
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 14 | Library General Public License for more details.
|
| 15 |
|
| 16 | You should have received a copy of the GNU Library General Public
|
| 17 | License along with the GNU C Library; see the file COPYING.LIB. If not,
|
| 18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
| 19 | Boston, MA 02111-1307, USA. */
|
| 20 |
|
| 21 | #ifndef _GETOPT_H
|
| 22 | #define _GETOPT_H 1
|
| 23 |
|
| 24 | #ifdef __cplusplus
|
| 25 | extern "C" {
|
| 26 | #endif
|
| 27 |
|
| 28 | /* For communication from `getopt' to the caller.
|
| 29 | When `getopt' finds an option that takes an argument,
|
| 30 | the argument value is returned here.
|
| 31 | Also, when `ordering' is RETURN_IN_ORDER,
|
| 32 | each non-option ARGV-element is returned here. */
|
| 33 |
|
| 34 | extern char *optarg;
|
| 35 |
|
| 36 | /* Index in ARGV of the next element to be scanned.
|
| 37 | This is used for communication to and from the caller
|
| 38 | and for communication between successive calls to `getopt'.
|
| 39 |
|
| 40 | On entry to `getopt', zero means this is the first call; initialize.
|
| 41 |
|
| 42 | When `getopt' returns -1, this is the index of the first of the
|
| 43 | non-option elements that the caller should itself scan.
|
| 44 |
|
| 45 | Otherwise, `optind' communicates from one call to the next
|
| 46 | how much of ARGV has been scanned so far. */
|
| 47 |
|
| 48 | extern int optind;
|
| 49 |
|
| 50 | /* Callers store zero here to inhibit the error message `getopt' prints
|
| 51 | for unrecognized options. */
|
| 52 |
|
| 53 | extern int opterr;
|
| 54 |
|
| 55 | /* Set to an option character which was unrecognized. */
|
| 56 |
|
| 57 | extern int optopt;
|
| 58 |
|
| 59 | /* Describe the long-named options requested by the application.
|
| 60 | The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
|
| 61 | of `struct option' terminated by an element containing a name which is
|
| 62 | zero.
|
| 63 |
|
| 64 | The field `has_arg' is:
|
| 65 | no_argument (or 0) if the option does not take an argument,
|
| 66 | required_argument (or 1) if the option requires an argument,
|
| 67 | optional_argument (or 2) if the option takes an optional argument.
|
| 68 |
|
| 69 | If the field `flag' is not NULL, it points to a variable that is set
|
| 70 | to the value given in the field `val' when the option is found, but
|
| 71 | left unchanged if the option is not found.
|
| 72 |
|
| 73 | To have a long-named option do something other than set an `int' to
|
| 74 | a compiled-in constant, such as set a value from `optarg', set the
|
| 75 | option's `flag' field to zero and its `val' field to a nonzero
|
| 76 | value (the equivalent single-letter option character, if there is
|
| 77 | one). For long options that have a zero `flag' field, `getopt'
|
| 78 | returns the contents of the `val' field. */
|
| 79 |
|
| 80 | struct option
|
| 81 | {
|
| 82 | const char *name;
|
| 83 | /* has_arg can't be an enum because some compilers complain about
|
| 84 | type mismatches in all the code that assumes it is an int. */
|
| 85 | int has_arg;
|
| 86 | int *flag;
|
| 87 | int val;
|
| 88 | };
|
| 89 |
|
| 90 | /* Names for the values of the `has_arg' field of `struct option'. */
|
| 91 |
|
| 92 | # define no_argument 0
|
| 93 | # define required_argument 1
|
| 94 | # define optional_argument 2
|
| 95 |
|
| 96 |
|
| 97 | /* Get definitions and prototypes for functions to process the
|
| 98 | arguments in ARGV (ARGC of them, minus the program name) for
|
| 99 | options given in OPTS.
|
| 100 |
|
| 101 | Return the option character from OPTS just read. Return -1 when
|
| 102 | there are no more options. For unrecognized options, or options
|
| 103 | missing arguments, `optopt' is set to the option letter, and '?' is
|
| 104 | returned.
|
| 105 |
|
| 106 | The OPTS string is a list of characters which are recognized option
|
| 107 | letters, optionally followed by colons, specifying that that letter
|
| 108 | takes an argument, to be placed in `optarg'.
|
| 109 |
|
| 110 | If a letter in OPTS is followed by two colons, its argument is
|
| 111 | optional. This behavior is specific to the GNU `getopt'.
|
| 112 |
|
| 113 | The argument `--' causes premature termination of argument
|
| 114 | scanning, explicitly telling `getopt' that there are no more
|
| 115 | options.
|
| 116 |
|
| 117 | If OPTS begins with `--', then non-option arguments are treated as
|
| 118 | arguments to the option '\0'. This behavior is specific to the GNU
|
| 119 | `getopt'. */
|
| 120 |
|
| 121 | int getopt (int argc, char *const *argv, const char *shortopts);
|
| 122 |
|
| 123 | int getopt_long (int argc, char *const *argv, const char *options,
|
| 124 | const struct option *longopts, int *longind);
|
| 125 | int getopt_long_only (int argc, char *const *argv,
|
| 126 | const char *shortopts,
|
| 127 | const struct option *longopts, int *longind);
|
| 128 |
|
| 129 | /* Internal only. Users should not call this directly. */
|
| 130 | int _getopt_internal (int argc, char *const *argv,
|
| 131 | const char *shortopts,
|
| 132 | const struct option *longopts, int *longind,
|
| 133 | int long_only);
|
| 134 |
|
| 135 | #ifdef __cplusplus
|
| 136 | }
|
| 137 | #endif
|
| 138 |
|
| 139 | #endif /* getopt.h */
|
| 140 |
|