ACE
6.3.3
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Iterator for parsing command-line arguments. More...
#include <Get_Opt.h>
Classes | |
class | ACE_Get_Opt_Long_Option |
Public Types | |
enum | { REQUIRE_ORDER = 1, PERMUTE_ARGS = 2, RETURN_IN_ORDER = 3 } |
Mutually exclusive ordering values. More... | |
enum | OPTION_ARG_MODE { NO_ARG = 0, ARG_REQUIRED = 1, ARG_OPTIONAL = 2 } |
Mutually exclusive option argument mode used by long options. More... | |
Public Member Functions | |
ACE_Get_Opt (int argc, ACE_TCHAR **argv, const ACE_TCHAR *optstring=ACE_TEXT(""), int skip_args=1, int report_errors=0, int ordering=PERMUTE_ARGS, int long_only=0) | |
~ACE_Get_Opt (void) | |
Default dtor. More... | |
int | operator() (void) |
ACE_TCHAR * | opt_arg (void) const |
int | opt_opt (void) |
int & | opt_ind (void) |
int | long_option (const ACE_TCHAR *name, OPTION_ARG_MODE has_arg=NO_ARG) |
Adds a long option with no corresponding short option. More... | |
int | long_option (const ACE_TCHAR *name, int short_option, OPTION_ARG_MODE has_arg=NO_ARG) |
Adds a long option with a corresponding short option. More... | |
const ACE_TCHAR * | long_option (void) const |
int | argc (void) const |
The number of arguments in the internal argv_ . More... | |
ACE_TCHAR ** | argv (void) const |
Accessor for the internal argv_ pointer. More... | |
const ACE_TCHAR * | last_option (void) const |
void | dump (void) const |
Dump the state of an object. More... | |
const ACE_TCHAR * | optstring (void) const |
Public Attributes | |
int | argc_ |
Holds the argc count. More... | |
ACE_TCHAR ** | argv_ |
Holds the argv pointer. More... | |
int | optind |
Index in argv_ of the next element to be scanned. More... | |
int | opterr |
ACE_TCHAR * | optarg |
Private Member Functions | |
int | nextchar_i (void) |
Updates nextchar_. More... | |
int | long_option_i (void) |
Handles long options. More... | |
int | short_option_i (void) |
Handles short options. More... | |
void | permute_args (void) |
int | permute (void) |
Handles reordering <argv>-elements. More... | |
void | last_option (const ACE_TString &s) |
Set last_option. More... | |
ACE_Get_Opt (const ACE_Get_Opt &) | |
ACE_Get_Opt & | operator= (const ACE_Get_Opt &) |
Private Attributes | |
ACE_TString * | optstring_ |
Holds the option string. More... | |
int | long_only_ |
Treat all options as long options. More... | |
int | has_colon_ |
ACE_TString * | last_option_ |
ACE_TCHAR * | nextchar_ |
int | optopt_ |
Most recently matched short option character. More... | |
int | ordering_ |
Keeps track of ordering mode (default <PERMUTE_ARGS>). More... | |
int | nonopt_start_ |
int | nonopt_end_ |
ACE_Get_Opt_Long_Option * | long_option_ |
Points to the long_option found on last call to <operator()>. More... | |
ACE_Array< ACE_Get_Opt_Long_Option * > | long_opts_ |
Array of long options. More... | |
ACE_ALLOC_HOOK_DECLARE | |
Declare the dynamic allocation hooks. More... | |
Iterator for parsing command-line arguments.
This is a C++ wrapper for getopt(3c) and getopt_long(3c).
anonymous enum |
Mutually exclusive ordering values.
Enumerator | |
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REQUIRE_ORDER |
REQUIRE_ORDER means that processing stops and |
PERMUTE_ARGS |
PERMUTE_ARGS means the argv elements are reordered dynamically (permuted) so that all options appear first. When the elements are permuted, the order of the options and the following arguments are maintained. When the last option has been processed, |
RETURN_IN_ORDER |
RETURN_IN_ORDER means each argv element is processed in the order is it seen. If the element is not recognized as an option, '1' is returned and |
Mutually exclusive option argument mode used by long options.
ACE_Get_Opt::ACE_Get_Opt | ( | int | argc, |
ACE_TCHAR ** | argv, | ||
const ACE_TCHAR * | optstring = ACE_TEXT ("") , |
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int | skip_args = 1 , |
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int | report_errors = 0 , |
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int | ordering = PERMUTE_ARGS , |
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int | long_only = 0 |
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) |
Constructor initializes the command line to be parsed. All information for parsing must be supplied to this constructor.
argc | The number of argv elements to parse. |
argv | Command line tokens, such as would be passed to main() . |
optstring | Nul-terminated string containing the legitimate short option characters. A single colon ":" following an option character means the option requires an argument. A double colon "::" following an option character means the argument is optional. The argument is taken from the rest of the current argv element, or from the following argv element (only valid for required arguments; optional arguments must always reside in the same argv element). The argument value, if any is returned by the opt_arg() method. optstring can be extended by adding long options with corresponding short options via the long_option() method. If the short option already appears in optstring, the argument characteristics must match, otherwise it is added. See long_option() for more information. If 'W', followed by a semi-colon ';' appears in optstring, then any time a 'W' appears on the command line, the following argument is treated as a long option. For example, if the command line contains "program -W foo", "foo" is treated as a long option, that is, as if "program --foo" had been passed. The following characters can appear in optstring before any option characters, with the described effect:
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skip_args | Optional (default 1). The specified number of initial elements in argv are skipped before parsing begins. Thus, the default prevents argv[0] (usually the command name) from being parsed. argc includes all argv elements, including any skipped elements. |
report_errors | Optional, if non-zero then parsing errors cause an error message to be displayed from the operator() method before it returns. The error message is suppressed if this argument is 0. This setting also controls whether or not an error message is displayed in long_option() encounters an error. |
ordering | Optional (default is PERMUTE_ARGS ); determines how the argv elements are processed. This argument is overridden by two factors:
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long_only | Optional. If non-zero, then long options can be specified using a single '-' on the command line. If the token is not a long option, it is processed as usual, that is, as a short option or set of short options. |
Multiple short options can be combined as long as only the last one can takes an argument. For example, if optstring is defined as "abc:"
or "abc::"
then the command line "program -abcxxx" short options a, b, and c are found with "xxx" as the argument for c. However, if the command line is specified as "program -acb" only options a and c are found with "b" as the argument for c. Also, for options with optional arguments, that is, those followed by "::", the argument must be in the same argv element, so "program -abc
xxx" will only find "xxx" as the argument for c if optstring is specified as "abc:"
not "abc::"
.
ACE_Get_Opt::~ACE_Get_Opt | ( | void | ) |
Default dtor.
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private |
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inline |
The number of arguments in the internal argv_
.
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inline |
Accessor for the internal argv_
pointer.
void ACE_Get_Opt::dump | ( | void | ) | const |
Dump the state of an object.
const ACE_TCHAR * ACE_Get_Opt::last_option | ( | void | ) | const |
Accessor for the last_option
that was processed. This allows applications to know if the found option was a short or long option, and is especially useful in cases where it was invalid and the caller wants to print out the invalid value.
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private |
Set last_option.
int ACE_Get_Opt::long_option | ( | const ACE_TCHAR * | name, |
OPTION_ARG_MODE | has_arg = NO_ARG |
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) |
Adds a long option with no corresponding short option.
If the name option is seen, operator()
returns 0.
name | The long option to add. |
has_arg | Defines the argument requirements for the new option. |
0 | Success |
-1 | The long option can not be added. |
int ACE_Get_Opt::long_option | ( | const ACE_TCHAR * | name, |
int | short_option, | ||
OPTION_ARG_MODE | has_arg = NO_ARG |
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) |
Adds a long option with a corresponding short option.
name | The long option to add. |
short_option | A character, the short option that corresponds to name. |
has_arg | Defines the argument requirements for the new option. If the short option has already been supplied in the optstring, has_arg must match or an error is returned; otherwise, the new short option is added to the optstring. |
0 | Success |
-1 | The long option can not be added. |
const ACE_TCHAR * ACE_Get_Opt::long_option | ( | void | ) | const |
Returns the name of the long option found on the last call to operator()
or 0 if none was found.
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private |
Handles long options.
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private |
Updates nextchar_.
int ACE_Get_Opt::operator() | ( | void | ) |
Scan elements of argv (whose length is argc) for short option characters given in optstring or long options (with no short option equivalents).
If an element of argv starts with '-', and is not exactly "-" or "--", then it is a short option element. The characters of this element (aside from the initial '-') are option characters. If it starts with "--" followed by other characters it is treated as a long option. If operator()
is called repeatedly, it returns each of the option characters from each of the option elements.
0 | A long option was found |
' |
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private |
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inline |
For communication from operator()
to the caller. When operator()
finds an option that takes an argument, the argument value is returned from this method, otherwise it returns 0.
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inline |
Index in argv of the next element to be scanned. This is used for communication to and from the caller and for communication between successive calls to operator()
. On entry to operator()
, zero means this is the first call; initialize.
When operator()
returns EOF
, this is the index of the first of the non-option elements that the caller should itself scan.
Otherwise, opt_ind()
communicates from one call to the next how much of argv has been scanned so far.
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inline |
Returns the most recently matched option character. Especially useful when operator() returns ':' for an unspecified argument that's required, since this allows the caller to learn what option was specified without its required argument.
const ACE_TCHAR * ACE_Get_Opt::optstring | ( | void | ) | const |
Return the optstring. This is handy to verify that calls to long_option added short options as expected.
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private |
Handles reordering <argv>-elements.
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private |
If permuting args, this functions manages the nonopt_start_ and nonopt_end_ indexes and makes calls to permute to actually reorder the <argv>-elements.
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private |
Handles short options.
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private |
Declare the dynamic allocation hooks.
int ACE_Get_Opt::argc_ |
Holds the argc count.
argc()
accessor method instead. ACE_TCHAR** ACE_Get_Opt::argv_ |
Holds the argv pointer.
argv()
accessor method instead.
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private |
Keeps track of whether or not a colon was passed in <optstring>. This is used to determine the return value when required arguments are missing.
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private |
This is the last option, short or long, that was processed. This is handy to have in cases where the option passed was invalid.
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private |
Treat all options as long options.
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private |
Points to the long_option found on last call to <operator()>.
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Array of long options.
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private |
The next char to be scanned in the option-element in which the last option character we returned was found. This allows us to pick up the scan where we left off * If this is zero, or a null string, it means resume the scan by advancing to the next <argv>-element.
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private |
Index of the <argv>-element following the last non-option element (only valid when permuting).
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private |
Index of the first non-option <argv>-element found (only valid when permuting).
ACE_TCHAR* ACE_Get_Opt::optarg |
Points to the option argument when one is found on last call to operator()
.
opt_arg()
accessor method instead. int ACE_Get_Opt::opterr |
Callers store zero here to inhibit the error message for unrecognized options.
int ACE_Get_Opt::optind |
Index in argv_
of the next element to be scanned.
opt_ind()
accessor method instead.
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private |
Most recently matched short option character.
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private |
Holds the option string.
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private |
Keeps track of ordering mode (default <PERMUTE_ARGS>).