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/*
* (c) Copyright 1990, Kim Fabricius Storm. All rights reserved.
*
* Include file for generic option parsing
*/
/*
* To use this routine, you must a table called an Option_Description.
* Each element in this table describes one possible option:
* Its option letter
* Its argument type (if any)
* Whether an argument is mandatory or optional
* The address of the variable holding the option value
* The defualt value if argument is optional
*
* Example:
*
* A program accepts the following options:
* -a [no value]
* -b N [a numeric value]
* -p [N] [an optional numeric value]
* -t S [a string value]
*
* The corresponding option description table would then look like:
*
* #include <options.h>
* int a_flg = 1, b_value = 0, p_value = 0;
* char *t_string = "default";
*
* Option_Description( options ) {
* 'a', Bool_Option(a_flg),
* 'b', Int_Option(b_value),
* 'p', Int_Option_Optional(p_value, -1),
* 't', String_Option(t_string),
* '\0',
* }
* To parse the argument list - and the contents of the environment variable
* XXINIT, all that has to be done is to issue the following call:
*
* files = parse_options(argc, argv, "XXINIT", options, NULL);
*
* If no environment variable is associated with the program, use NULL as
* the third parameter.
*
* Upon return, the elements argv[1] .. argv[files] will contain
* the file names (and other 'non-options') that occur in the argument list.
*
* The last NULL argument may be replaced by your own 'usage routine'
* which will be called in the following way:
*
* usage(pname)
* char *pname; /+ argv[0] without path +/
*
*
* char *program_name(argv)
*
* return a pointer to the last component of argv[0] (the program name with
* with the path deleted).
*
*/
#ifndef _NN_OPTIONS_H
#define _NN_OPTIONS_H 1
struct option_descr {
char option_letter;
char option_type;
char ** option_address;
char * option_default;
} ;
#define Option_Description(name) \
struct option_descr name[] =
#define Bool_Option(addr) \
1, (char **)(&addr), (char *)0
#define String_Option(addr) \
2, &addr, (char *)0
#define String_Option_Optional(addr, default) \
3, &addr, default
#define Int_Option(addr) \
4, (char **)(&addr), (char *)0
#define Int_Option_Optional(addr, default) \
5, (char **)(&addr), (char *)default
#endif /* _NN_OPTIONS_H */
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