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