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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 *
6 *   Copyright (C) 2000-2011, International Business Machines
7 *   Corporation and others.  All Rights Reserved.
8 *
9 *******************************************************************************
10 *   file name:  uoptions.h
11 *   encoding:   UTF-8
12 *   tab size:   8 (not used)
13 *   indentation:4
14 *
15 *   created on: 2000apr17
16 *   created by: Markus W. Scherer
17 *
18 *   This file provides a command line argument parser.
19 */
20 
21 #ifndef __UOPTIONS_H__
22 #define __UOPTIONS_H__
23 
24 #include "unicode/utypes.h"
25 
26 /* This should usually be called before calling u_parseArgs */
27 /*#if U_PLATFORM == U_PF_OS390 && (U_CHARSET_FAMILY == U_ASCII_FAMILY)*/
28     /* translate args from EBCDIC to ASCII */
29 /*#   define U_MAIN_INIT_ARGS(argc, argv) __argvtoascii_a(argc, argv)*/
30 /*#elif defined(XP_MAC_CONSOLE)*/
31 #if defined(XP_MAC_CONSOLE)
32 #   include <console.h>
33     /* Get the arguments from the GUI, since old Macs don't have a console Window. */
34 #   define U_MAIN_INIT_ARGS(argc, argv) argc = ccommand((char***)&argv)
35 #else
36     /* Normally we do nothing. */
37 #   define U_MAIN_INIT_ARGS(argc, argv)
38 #endif
39 
40 
41 
42 /* forward declarations for the function declaration */
43 struct UOption;
44 typedef struct UOption UOption;
45 
46 /* function to be called for a command line option */
47 typedef int UOptionFn(void *context, UOption *option);
48 
49 /* values of UOption.hasArg */
50 enum { UOPT_NO_ARG, UOPT_REQUIRES_ARG, UOPT_OPTIONAL_ARG };
51 
52 /* structure describing a command line option */
53 struct UOption {
54     const char *longName;   /* "foo" for --foo */
55     const char *value;      /* output placeholder, will point to the argument string, if any */
56     UOptionFn *optionFn;    /* function to be called when this option occurs */
57     void *context;          /* parameter for the function */
58     char shortName;         /* 'f' for -f */
59     char hasArg;            /* enum value: option takes no/requires/may have argument */
60     char doesOccur;         /* boolean for "this one occured" */
61 };
62 
63 /* macro for an entry in a declaration of UOption[] */
64 #define UOPTION_DEF(longName, shortName, hasArg) \
65     { longName, NULL, NULL, NULL, shortName, hasArg, 0 }
66 
67 /* ICU Tools option definitions */
68 #define UOPTION_HELP_H              UOPTION_DEF("help", 'h', UOPT_NO_ARG)
69 #define UOPTION_HELP_QUESTION_MARK  UOPTION_DEF("help", '?', UOPT_NO_ARG)
70 #define UOPTION_VERBOSE             UOPTION_DEF("verbose", 'v', UOPT_NO_ARG)
71 #define UOPTION_QUIET               UOPTION_DEF("quiet", 'q', UOPT_NO_ARG)
72 #define UOPTION_VERSION             UOPTION_DEF("version", 'V', UOPT_NO_ARG)
73 #define UOPTION_COPYRIGHT           UOPTION_DEF("copyright", 'c', UOPT_NO_ARG)
74 
75 #define UOPTION_DESTDIR             UOPTION_DEF("destdir", 'd', UOPT_REQUIRES_ARG)
76 #define UOPTION_SOURCEDIR           UOPTION_DEF("sourcedir", 's', UOPT_REQUIRES_ARG)
77 #define UOPTION_ENCODING            UOPTION_DEF("encoding", 'e', UOPT_REQUIRES_ARG)
78 #define UOPTION_ICUDATADIR          UOPTION_DEF("icudatadir", 'i', UOPT_REQUIRES_ARG)
79 #define UOPTION_WRITE_JAVA          UOPTION_DEF("write-java", 'j', UOPT_OPTIONAL_ARG)
80 #define UOPTION_PACKAGE_NAME        UOPTION_DEF("package-name", 'p', UOPT_REQUIRES_ARG)
81 #define UOPTION_BUNDLE_NAME         UOPTION_DEF("bundle-name", 'b', UOPT_REQUIRES_ARG)
82 
83 /**
84  * C Command line argument parser.
85  *
86  * This function takes the argv[argc] command line and a description of
87  * the program's options in form of an array of UOption structures.
88  * Each UOption defines a long and a short name (a string and a character)
89  * for options like "--foo" and "-f".
90  *
91  * Each option is marked with whether it does not take an argument,
92  * requires one, or optionally takes one. The argument may follow in
93  * the same argv[] entry for short options, or it may always follow
94  * in the next argv[] entry.
95  *
96  * An argument is in the next argv[] entry for both long and short name
97  * options, except it is taken from directly behind the short name in
98  * its own argv[] entry if there are characters following the option letter.
99  * An argument in its own argv[] entry must not begin with a '-'
100  * unless it is only the '-' itself. There is no restriction of the
101  * argument format if it is part of the short name options's argv[] entry.
102  *
103  * The argument is stored in the value field of the corresponding
104  * UOption entry, and the doesOccur field is set to 1 if the option
105  * is found at all.
106  *
107  * Short name options without arguments can be collapsed into a single
108  * argv[] entry. After an option letter takes an argument, following
109  * letters will be taken as its argument.
110  *
111  * If the same option is found several times, then the last
112  * argument value will be stored in the value field.
113  *
114  * For each option, a function can be called. This could be used
115  * for options that occur multiple times and all arguments are to
116  * be collected.
117  *
118  * All options are removed from the argv[] array itself. If the parser
119  * is successful, then it returns the number of remaining non-option
120  * strings (including argv[0]).
121  * argv[0], the program name, is never read or modified.
122  *
123  * An option "--" ends option processing; everything after this
124  * remains in the argv[] array.
125  *
126  * An option string "-" alone is treated as a non-option.
127  *
128  * If an option is not recognized or an argument missing, then
129  * the parser returns with the negative index of the argv[] entry
130  * where the error was detected.
131  *
132  * The OS/400 compiler requires that argv either be "char* argv[]",
133  * or "const char* const argv[]", and it will not accept,
134  * "const char* argv[]" as a definition for main().
135  *
136  * @param argv This parameter is modified
137  * @param options This parameter is modified
138  */
139 U_CAPI int U_EXPORT2
140 u_parseArgs(int argc, char* argv[],
141             int optionCount, UOption options[]);
142 
143 #endif
144