191 lines
6.5 KiB
C
191 lines
6.5 KiB
C
/****************************************************************************
|
|
|
|
getopt.h - Read command line options
|
|
|
|
AUTHOR: Gregory Pietsch
|
|
CREATED Thu Jan 09 22:37:00 1997
|
|
|
|
DESCRIPTION:
|
|
|
|
The getopt() function parses the command line arguments. Its arguments argc
|
|
and argv are the argument count and array as passed to the main() function
|
|
on program invocation. The argument optstring is a list of available option
|
|
characters. If such a character is followed by a colon (`:'), the option
|
|
takes an argument, which is placed in optarg. If such a character is
|
|
followed by two colons, the option takes an optional argument, which is
|
|
placed in optarg. If the option does not take an argument, optarg is NULL.
|
|
|
|
The external variable optind is the index of the next array element of argv
|
|
to be processed; it communicates from one call to the next which element to
|
|
process.
|
|
|
|
The getopt_long() function works like getopt() except that it also accepts
|
|
long options started by two dashes `--'. If these take values, it is either
|
|
in the form
|
|
|
|
--arg=value
|
|
|
|
or
|
|
|
|
--arg value
|
|
|
|
It takes the additional arguments longopts which is a pointer to the first
|
|
element of an array of type GETOPT_LONG_OPTION_T, defined below. The last
|
|
element of the array has to be filled with NULL for the name field.
|
|
|
|
The longind pointer points to the index of the current long option relative
|
|
to longopts if it is non-NULL.
|
|
|
|
The getopt() function returns the option character if the option was found
|
|
successfully, `:' if there was a missing parameter for one of the options,
|
|
`?' for an unknown option character, and EOF for the end of the option list.
|
|
|
|
The getopt_long() function's return value is described below.
|
|
|
|
The function getopt_long_only() is identical to getopt_long(), except that a
|
|
plus sign `+' can introduce long options as well as `--'.
|
|
|
|
Describe how to deal with options that follow non-option ARGV-elements.
|
|
|
|
If the caller did not specify anything, the default is REQUIRE_ORDER if the
|
|
environment variable POSIXLY_CORRECT is defined, PERMUTE otherwise.
|
|
|
|
REQUIRE_ORDER means don't recognize them as options; stop option processing
|
|
when the first non-option is seen. This is what Unix does. This mode of
|
|
operation is selected by either setting the environment variable
|
|
POSIXLY_CORRECT, or using `+' as the first character of the optstring
|
|
parameter.
|
|
|
|
PERMUTE is the default. We permute the contents of ARGV as we scan, so that
|
|
eventually all the non-options are at the end. This allows options to be
|
|
given in any order, even with programs that were not written to expect this.
|
|
|
|
RETURN_IN_ORDER is an option available to programs that were written to
|
|
expect options and other ARGV-elements in any order and that care about the
|
|
ordering of the two. We describe each non-option ARGV-element as if it were
|
|
the argument of an option with character code 1. Using `-' as the first
|
|
character of the optstring parameter selects this mode of operation.
|
|
|
|
The special argument `--' forces an end of option-scanning regardless of the
|
|
value of `ordering'. In the case of RETURN_IN_ORDER, only `--' can cause
|
|
getopt() and friends to return EOF with optind != argc.
|
|
|
|
COPYRIGHT NOTICE AND DISCLAIMER:
|
|
|
|
Copyright (C) 1997 Gregory Pietsch
|
|
|
|
This file and the accompanying getopt.c implementation file are hereby
|
|
placed in the public domain without restrictions. Just give the author
|
|
credit, don't claim you wrote it or prevent anyone else from using it.
|
|
|
|
Gregory Pietsch's current e-mail address:
|
|
gpietsch@comcast.net
|
|
****************************************************************************/
|
|
|
|
/* This is a glibc-extension header file. */
|
|
|
|
#ifndef GETOPT_H
|
|
#define GETOPT_H
|
|
|
|
#include <_ansi.h>
|
|
|
|
/* include files needed by this include file */
|
|
|
|
#define no_argument 0
|
|
#define required_argument 1
|
|
#define optional_argument 2
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
|
|
#endif /* __cplusplus */
|
|
|
|
/* types defined by this include file */
|
|
struct option
|
|
{
|
|
const char *name; /* the name of the long option */
|
|
int has_arg; /* one of the above macros */
|
|
int *flag; /* determines if getopt_long() returns a
|
|
* value for a long option; if it is
|
|
* non-NULL, 0 is returned as a function
|
|
* value and the value of val is stored in
|
|
* the area pointed to by flag. Otherwise,
|
|
* val is returned. */
|
|
int val; /* determines the value to return if flag is
|
|
* NULL. */
|
|
|
|
};
|
|
|
|
/* While getopt.h is a glibc extension, the following are newlib extensions.
|
|
* They are optionally included via the __need_getopt_newlib flag. */
|
|
|
|
#ifdef __need_getopt_newlib
|
|
|
|
/* macros defined by this include file */
|
|
#define NO_ARG no_argument
|
|
#define REQUIRED_ARG required_argument
|
|
#define OPTIONAL_ARG optional_argument
|
|
|
|
/* The GETOPT_DATA_INITIALIZER macro is used to initialize a statically-
|
|
allocated variable of type struct getopt_data. */
|
|
#define GETOPT_DATA_INITIALIZER {0,0,0,0,0}
|
|
|
|
/* These #defines are to make accessing the reentrant functions easier. */
|
|
#define getopt_r __getopt_r
|
|
#define getopt_long_r __getopt_long_r
|
|
#define getopt_long_only_r __getopt_long_only_r
|
|
|
|
/* The getopt_data structure is for reentrancy. Its members are similar to
|
|
the externally-defined variables. */
|
|
typedef struct getopt_data
|
|
{
|
|
char *optarg;
|
|
int optind, opterr, optopt, optwhere;
|
|
} getopt_data;
|
|
|
|
#endif /* __need_getopt_newlib */
|
|
|
|
/* externally-defined variables */
|
|
extern char *optarg;
|
|
extern int optind;
|
|
extern int opterr;
|
|
extern int optopt;
|
|
|
|
/* function prototypes */
|
|
int _EXFUN (getopt,
|
|
(int __argc, char *const __argv[], const char *__optstring));
|
|
|
|
int _EXFUN (getopt_long,
|
|
(int __argc, char *const __argv[], const char *__shortopts,
|
|
const struct option * __longopts, int *__longind));
|
|
|
|
int _EXFUN (getopt_long_only,
|
|
(int __argc, char *const __argv[], const char *__shortopts,
|
|
const struct option * __longopts, int *__longind));
|
|
|
|
#ifdef __need_getopt_newlib
|
|
int _EXFUN (__getopt_r,
|
|
(int __argc, char *const __argv[], const char *__optstring,
|
|
struct getopt_data * __data));
|
|
|
|
int _EXFUN (__getopt_long_r,
|
|
(int __argc, char *const __argv[], const char *__shortopts,
|
|
const struct option * __longopts, int *__longind,
|
|
struct getopt_data * __data));
|
|
|
|
int _EXFUN (__getopt_long_only_r,
|
|
(int __argc, char *const __argv[], const char *__shortopts,
|
|
const struct option * __longopts, int *__longind,
|
|
struct getopt_data * __data));
|
|
#endif /* __need_getopt_newlib */
|
|
|
|
#ifdef __cplusplus
|
|
};
|
|
|
|
#endif /* __cplusplus */
|
|
|
|
#endif /* GETOPT_H */
|
|
|
|
/* END OF FILE getopt.h */
|