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143 lines
5.3 KiB
C
143 lines
5.3 KiB
C
////////////////////////////////////////////////////////////////////
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// Copyright (C) Alexander Telyatnikov, Ivan Keliukh, Yegor Anchishkin, SKIF Software, 1999-2013. Kiev, Ukraine
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// All rights reserved
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// This file was released under the GPLv2 on June 2015.
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////////////////////////////////////////////////////////////////////
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#ifndef _GETOPT_H
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#define _GETOPT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define BAD_OPTION '\0'
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typedef struct _optarg_ctx {
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/* For communication from `getopt' to the caller.
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When `getopt' finds an option that takes an argument,
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the argument value is returned here.
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Also, when `ordering' is RETURN_IN_ORDER,
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each non-option ARGV-element is returned here. */
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WCHAR* optarg;
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/* Index in ARGV of the next element to be scanned.
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This is used for communication to and from the caller
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and for communication between successive calls to `getopt'.
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On entry to `getopt', zero means this is the first call; initialize.
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When `getopt' returns EOF, this is the index of the first of the
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non-option elements that the caller should itself scan.
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Otherwise, `optind' communicates from one call to the next
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how much of ARGV has been scanned so far. */
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int optind;
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/* The next char to be scanned in the option-element
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in which the last option character we returned was found.
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This allows us to pick up the scan where we left off.
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If this is zero, or a null string, it means resume the scan
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by advancing to the next ARGV-element. */
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WCHAR *nextchar;
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/* Callers store zero here to inhibit the error message
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for unrecognized options. */
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int opterr;
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/* Set to an option character which was unrecognized.
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This must be initialized on some systems to avoid linking in the
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system's own getopt implementation. */
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int optopt;
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/* Describe the part of ARGV that contains non-options that have
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been skipped. `first_nonopt' is the index in ARGV of the first of them;
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`last_nonopt' is the index after the last of them. */
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int first_nonopt;
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int last_nonopt;
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/* Exchange two adjacent subsequences of ARGV.
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One subsequence is elements [first_nonopt,last_nonopt)
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which contains all the non-options that have been skipped so far.
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The other is elements [last_nonopt,optind), which contains all
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the options processed since those non-options were skipped.
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`first_nonopt' and `last_nonopt' are relocated so that they describe
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the new indices of the non-options in ARGV after they are moved.
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To perform the swap, we first reverse the order of all elements. So
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all options now come before all non options, but they are in the
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wrong order. So we put back the options and non options in original
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order by reversing them again. For example:
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original input: a b c -x -y
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reverse all: -y -x c b a
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reverse options: -x -y c b a
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reverse non options: -x -y a b c
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*/
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} optarg_ctx, *P_optarg_ctx;
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/* Describe the long-named options requested by the application.
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The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
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of `struct option' terminated by an element containing a name which is
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zero.
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The field `has_arg' is:
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no_argument (or 0) if the option does not take an argument,
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required_argument (or 1) if the option requires an argument,
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optional_argument (or 2) if the option takes an optional argument.
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If the field `flag' is not NULL, it points to a variable that is set
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to the value given in the field `val' when the option is found, but
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left unchanged if the option is not found.
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To have a long-named option do something other than set an `int' to
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a compiled-in constant, such as set a value from `optarg', set the
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option's `flag' field to zero and its `val' field to a nonzero
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value (the equivalent single-letter option character, if there is
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one). For long options that have a zero `flag' field, `getopt'
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returns the contents of the `val' field. */
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struct option
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{
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WCHAR *name;
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/* has_arg can't be an enum because some compilers complain about
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type mismatches in all the code that assumes it is an int. */
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int has_arg;
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int *flag;
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int val;
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};
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extern void getopt_init(optarg_ctx* o);
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/* Names for the values of the `has_arg' field of `struct option'. */
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#define no_argument 0
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#define required_argument 1
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#define optional_argument 2
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extern int getopt (optarg_ctx* o, int argc, WCHAR *const *argv, const WCHAR *shortopts);
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extern int getopt_long (optarg_ctx* o, int argc, WCHAR *const *argv, const WCHAR *shortopts,
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const struct option *longopts, int *longind);
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extern int getopt_long_only (optarg_ctx* o, int argc, WCHAR *const *argv,
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const WCHAR *shortopts,
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const struct option *longopts, int *longind);
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/* Internal only. Users should not call this directly. */
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extern int _getopt_internal (optarg_ctx* o, int argc, WCHAR *const *argv,
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const WCHAR *shortopts,
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const struct option *longopts, int *longind,
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int long_only);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _GETOPT_H */
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