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authorWilliam Joye <wjoye@cfa.harvard.edu>2018-01-02 20:34:49 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2018-01-02 20:34:49 (GMT)
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-'\"
-'\" Copyright (c) 1990-1992 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tk_ParseArgv 3 "" Tk "Tk Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tk_ParseArgv \- process command-line options
-.SH SYNOPSIS
-.nf
-\fB#include <tk.h>\fR
-.sp
-int
-\fBTk_ParseArgv\fR(\fIinterp, tkwin, argcPtr, argv, argTable, flags\fR)
-.SH ARGUMENTS
-.AS Tk_ArgvInfo *argTable
-.AP Tcl_Interp *interp in
-Interpreter to use for returning error messages.
-.AP Tk_Window tkwin in
-Window to use when arguments specify Tk options. If NULL, then
-no Tk options will be processed.
-.AP int argcPtr in/out
-Pointer to number of arguments in argv; gets modified to hold
-number of unprocessed arguments that remain after the call.
-.AP "const char" **argv in/out
-Command line arguments passed to main program. Modified to
-hold unprocessed arguments that remain after the call.
-.AP Tk_ArgvInfo *argTable in
-Array of argument descriptors, terminated by element with
-type \fBTK_ARGV_END\fR.
-.AP int flags in
-If non-zero, then it specifies one or more flags that control the
-parsing of arguments. Different flags may be OR'ed together.
-The flags currently defined are \fBTK_ARGV_DONT_SKIP_FIRST_ARG\fR,
-\fBTK_ARGV_NO_ABBREV\fR, \fBTK_ARGV_NO_LEFTOVERS\fR, and
-\fBTK_ARGV_NO_DEFAULTS\fR.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTk_ParseArgv\fR processes an array of command-line arguments according
-to a table describing the kinds of arguments that are expected.
-Each of the arguments in \fIargv\fR is processed in turn: if it matches
-one of the entries in \fIargTable\fR, the argument is processed
-according to that entry and discarded. The arguments that do not
-match anything in \fIargTable\fR are copied down to the beginning
-of \fIargv\fR (retaining their original order) and returned to
-the caller. At the end of the call
-\fBTk_ParseArgv\fR sets \fI*argcPtr\fR to hold the number of
-arguments that are left in \fIargv\fR, and \fIargv[*argcPtr]\fR
-will hold the value NULL. Normally, \fBTk_ParseArgv\fR
-assumes that \fIargv[0]\fR is a command name, so it is treated like
-an argument that does not match \fIargTable\fR and returned to the
-caller; however, if the \fBTK_ARGV_DONT_SKIP_FIRST_ARG\fR bit is set in
-\fIflags\fR then \fIargv[0]\fR will be processed just like the other
-elements of \fIargv\fR.
-.PP
-\fBTk_ParseArgv\fR normally returns the value \fBTCL_OK\fR. If an error
-occurs while parsing the arguments, then \fBTCL_ERROR\fR is returned and
-\fBTk_ParseArgv\fR will leave an error message in the result of
-interpreter \fIinterp\fR in the standard Tcl fashion. In
-the event of an error return, \fI*argvPtr\fR will not have been
-modified, but \fIargv\fR could have been partially modified. The
-possible causes of errors are explained below.
-.PP
-The \fIargTable\fR array specifies the kinds of arguments that are
-expected; each of its entries has the following structure:
-.CS
-typedef struct {
- const char *\fIkey\fR;
- int \fItype\fR;
- char *\fIsrc\fR;
- char *\fIdst\fR;
- const char *\fIhelp\fR;
-} \fBTk_ArgvInfo\fR;
-.CE
-The \fIkey\fR field is a string such as
-.QW \-display
-or
-.QW \-bg
-that is compared with the values in \fIargv\fR. \fIType\fR
-indicates how to process an argument that matches \fIkey\fR
-(more on this below). \fISrc\fR and \fIdst\fR are additional
-values used in processing the argument. Their exact usage
-depends on \fItype\fR, but typically \fIsrc\fR indicates
-a value and \fIdst\fR indicates where to store the
-value. The \fBchar *\fR declarations for \fIsrc\fR and \fIdst\fR
-are placeholders: the actual types may be different. Lastly,
-\fIhelp\fR is a string giving a brief description
-of this option; this string is printed when users ask for help
-about command-line options.
-.PP
-When processing an argument in \fIargv\fR, \fBTk_ParseArgv\fR
-compares the argument to each of the \fIkey\fR's in \fIargTable\fR.
-\fBTk_ParseArgv\fR selects the first specifier whose \fIkey\fR matches
-the argument exactly, if such a specifier exists. Otherwise
-\fBTk_ParseArgv\fR selects a specifier for which the argument
-is a unique abbreviation. If the argument is a unique abbreviation
-for more than one specifier, then an error is returned. If there
-is no matching entry in \fIargTable\fR, then the argument is
-skipped and returned to the caller.
-.PP
-Once a matching argument specifier is found, \fBTk_ParseArgv\fR
-processes the argument according to the \fItype\fR field of the
-specifier. The argument that matched \fIkey\fR is called
-.QW "the matching argument"
-in the descriptions below. As part of the processing,
-\fBTk_ParseArgv\fR may also use the next argument in \fIargv\fR
-after the matching argument, which is called
-.QW "the following argument" .
-The legal values for \fItype\fR, and the processing
-that they cause, are as follows:
-.TP
-\fBTK_ARGV_END\fR
-Marks the end of the table. The last entry in \fIargTable\fR
-must have this type; all of its other fields are ignored and it
-will never match any arguments.
-.TP
-\fBTK_ARGV_CONSTANT\fR
-\fISrc\fR is treated as an integer and \fIdst\fR is treated
-as a pointer to an integer. \fISrc\fR is stored at \fI*dst\fR.
-The matching argument is discarded.
-.TP
-\fBTK_ARGV_INT\fR
-The following argument must contain an
-integer string in the format accepted by \fBstrtol\fR (e.g.
-.QW 0
-and
-.QW 0x
-prefixes may be used to specify octal or hexadecimal
-numbers, respectively). \fIDst\fR is treated as a pointer to an
-integer; the following argument is converted to an integer value
-and stored at \fI*dst\fR. \fISrc\fR is ignored. The matching
-and following arguments are discarded from \fIargv\fR.
-.TP
-\fBTK_ARGV_FLOAT\fR
-The following argument must contain a floating-point number in
-the format accepted by \fBstrtol\fR.
-\fIDst\fR is treated as the address of a double-precision
-floating point value; the following argument is converted to a
-double-precision value and stored at \fI*dst\fR. The matching
-and following arguments are discarded from \fIargv\fR.
-.TP
-\fBTK_ARGV_STRING\fR
-In this form, \fIdst\fR is treated as a pointer to a (char *);
-\fBTk_ParseArgv\fR stores at \fI*dst\fR a pointer to the following
-argument, and discards the matching and following arguments from
-\fIargv\fR. \fISrc\fR is ignored.
-.TP
-\fBTK_ARGV_UID\fR
-This form is similar to \fBTK_ARGV_STRING\fR, except that the argument
-is turned into a Tk_Uid by calling \fBTk_GetUid\fR.
-\fIDst\fR is treated as a pointer to a
-Tk_Uid; \fBTk_ParseArgv\fR stores at \fI*dst\fR the Tk_Uid
-corresponding to the following
-argument, and discards the matching and following arguments from
-\fIargv\fR. \fISrc\fR is ignored.
-.TP
-\fBTK_ARGV_CONST_OPTION\fR
-This form causes a Tk option to be set (as if the \fBoption\fR
-command had been invoked). The \fIsrc\fR field is treated as a
-pointer to a string giving the value of an option, and \fIdst\fR
-is treated as a pointer to the name of the option. The matching
-argument is discarded. If \fItkwin\fR is NULL, then argument
-specifiers of this type are ignored (as if they did not exist).
-.TP
-\fBTK_ARGV_OPTION_VALUE\fR
-This form is similar to \fBTK_ARGV_CONST_OPTION\fR, except that the
-value of the option is taken from the following argument instead
-of from \fIsrc\fR. \fIDst\fR is used as the name of the option.
-\fISrc\fR is ignored. The matching and following arguments
-are discarded. If \fItkwin\fR is NULL, then argument
-specifiers of this type are ignored (as if they did not exist).
-.TP
-\fBTK_ARGV_OPTION_NAME_VALUE\fR
-In this case the following argument is taken as the name of a Tk
-option and the argument after that is taken as the value for that
-option. Both \fIsrc\fR and \fIdst\fR are ignored. All three
-arguments are discarded from \fIargv\fR. If \fItkwin\fR is NULL,
-then argument
-specifiers of this type are ignored (as if they did not exist).
-.TP
-\fBTK_ARGV_HELP\fR
-When this kind of option is encountered, \fBTk_ParseArgv\fR uses the
-\fIhelp\fR fields of \fIargTable\fR to format a message describing
-all the valid arguments. The message is placed in interpreter
-\fIinterp\fR's result
-and \fBTk_ParseArgv\fR returns \fBTCL_ERROR\fR. When this happens, the
-caller normally prints the help message and aborts. If the \fIkey\fR
-field of a \fBTK_ARGV_HELP\fR specifier is NULL, then the specifier will
-never match any arguments; in this case the specifier simply provides
-extra documentation, which will be included when some other
-\fBTK_ARGV_HELP\fR entry causes help information to be returned.
-.TP
-\fBTK_ARGV_REST\fR
-This option is used by programs or commands that allow the last
-several of their options to be the name and/or options for some
-other program. If a \fBTK_ARGV_REST\fR argument is found, then
-\fBTk_ParseArgv\fR does not process any
-of the remaining arguments; it returns them all at
-the beginning of \fIargv\fR (along with any other unprocessed arguments).
-In addition, \fBTk_ParseArgv\fR treats \fIdst\fR as the address of an
-integer value, and stores at \fI*dst\fR the index of the first of the
-\fBTK_ARGV_REST\fR options in the returned \fIargv\fR. This allows the
-program to distinguish the \fBTK_ARGV_REST\fR options from other
-unprocessed options that preceded the \fBTK_ARGV_REST\fR.
-.TP
-\fBTK_ARGV_FUNC\fR
-For this kind of argument, \fIsrc\fR is treated as the address of
-a procedure, which is invoked to process the following argument.
-The procedure should have the following structure:
-.RS
-.CS
-int
-\fIfunc\fR(\fIdst\fR, \fIkey\fR, \fInextArg\fR)
- char *\fIdst\fR;
- char *\fIkey\fR;
- char *\fInextArg\fR;
-{
-}
-.CE
-The \fIdst\fR and \fIkey\fR parameters will contain the
-corresponding fields from the \fIargTable\fR entry, and
-\fInextArg\fR will point to the following argument from \fIargv\fR
-(or NULL if there are not any more arguments left in \fIargv\fR).
-If \fIfunc\fR uses \fInextArg\fR (so that
-\fBTk_ParseArgv\fR should discard it), then it should return 1. Otherwise it
-should return 0 and \fBTkParseArgv\fR will process the following
-argument in the normal fashion. In either event the matching argument
-is discarded.
-.RE
-.TP
-\fBTK_ARGV_GENFUNC\fR
-This form provides a more general procedural escape. It treats
-\fIsrc\fR as the address of a procedure, and passes that procedure
-all of the remaining arguments. The procedure should have the following
-form:
-.RS
-.CS
-int
-\fIgenfunc\fR(dst, interp, key, argc, argv)
- char *\fIdst\fR;
- Tcl_Interp *\fIinterp\fR;
- char *\fIkey\fR;
- int \fIargc\fR;
- char **\fIargv\fR;
-{
-}
-.CE
-The \fIdst\fR and \fIkey\fR parameters will contain the
-corresponding fields from the \fIargTable\fR entry. \fIInterp\fR
-will be the same as the \fIinterp\fR argument to \fBTcl_ParseArgv\fR.
-\fIArgc\fR and \fIargv\fR refer to all of the options after the
-matching one. \fIGenfunc\fR should behave in a fashion similar
-to \fBTk_ParseArgv\fR: parse as many of the remaining arguments as it can,
-then return any that are left by compacting them to the beginning of
-\fIargv\fR (starting at \fIargv\fR[0]). \fIGenfunc\fR
-should return a count of how many arguments are left in \fIargv\fR;
-\fBTk_ParseArgv\fR will process them. If \fIgenfunc\fR encounters
-an error then it should leave an error message in interpreter
-\fIinterp\fR's result,
-in the usual Tcl fashion, and return \-1; when this happens
-\fBTk_ParseArgv\fR will abort its processing and return \fBTCL_ERROR\fR.
-.RE
-.SS "FLAGS"
-.TP
-\fBTK_ARGV_DONT_SKIP_FIRST_ARG\fR
-\fBTk_ParseArgv\fR normally treats \fIargv[0]\fR as a program
-or command name, and returns it to the caller just as if it
-had not matched \fIargTable\fR. If this flag is given, then
-\fIargv[0]\fR is not given special treatment.
-.TP
-\fBTK_ARGV_NO_ABBREV\fR
-Normally, \fBTk_ParseArgv\fR accepts unique abbreviations for
-\fIkey\fR values in \fIargTable\fR. If this flag is given then
-only exact matches will be acceptable.
-.TP
-\fBTK_ARGV_NO_LEFTOVERS\fR
-Normally, \fBTk_ParseArgv\fR returns unrecognized arguments to the
-caller. If this bit is set in \fIflags\fR then \fBTk_ParseArgv\fR
-will return an error if it encounters any argument that does not
-match \fIargTable\fR. The only exception to this rule is \fIargv[0]\fR,
-which will be returned to the caller with no errors as
-long as \fBTK_ARGV_DONT_SKIP_FIRST_ARG\fR is not specified.
-.TP
-\fBTK_ARGV_NO_DEFAULTS\fR
-Normally, \fBTk_ParseArgv\fR searches an internal table of
-standard argument specifiers in addition to \fIargTable\fR. If
-this bit is set in \fIflags\fR, then \fBTk_ParseArgv\fR will
-use only \fIargTable\fR and not its default table.
-.SH EXAMPLE
-.PP
-Here is an example definition of an \fIargTable\fR and
-some sample command lines that use the options. Note the effect
-on \fIargc\fR and \fIargv\fR; arguments processed by \fBTk_ParseArgv\fR
-are eliminated from \fIargv\fR, and \fIargc\fR
-is updated to reflect reduced number of arguments.
-.CS
-/*
- * Define and set default values for globals.
- */
-int debugFlag = 0;
-int numReps = 100;
-char defaultFileName[] = "out";
-char *fileName = defaultFileName;
-Boolean exec = FALSE;
-
-/*
- * Define option descriptions.
- */
-Tk_ArgvInfo argTable[] = {
- {"\-X", TK_ARGV_CONSTANT, (char *) 1, (char *) &debugFlag,
- "Turn on debugging printfs"},
- {"\-N", TK_ARGV_INT, (char *) NULL, (char *) &numReps,
- "Number of repetitions"},
- {"\-of", TK_ARGV_STRING, (char *) NULL, (char *) &fileName,
- "Name of file for output"},
- {"x", TK_ARGV_REST, (char *) NULL, (char *) &exec,
- "File to exec, followed by any arguments (must be last argument)."},
- {(char *) NULL, TK_ARGV_END, (char *) NULL, (char *) NULL,
- (char *) NULL}
-};
-
-main(argc, argv)
- int argc;
- char *argv[];
-{
- \&...
-
- if (Tk_ParseArgv(interp, tkwin, &argc, argv, argTable, 0) != TCL_OK) {
- fprintf(stderr, "%s\en", Tcl_GetString(Tcl_GetObjResult(interp)));
- exit(1);
- }
-
- /*
- * Remainder of the program.
- */
-}
-.CE
-.PP
-Note that default values can be assigned to variables named in
-\fIargTable\fR: the variables will only be overwritten if the
-particular arguments are present in \fIargv\fR.
-Here are some example command lines and their effects.
-.CS
-prog \-N 200 infile # just sets the numReps variable to 200
-prog \-of out200 infile # sets fileName to reference "out200"
-prog \-XN 10 infile # sets the debug flag, also sets numReps
-.CE
-In all of the above examples, \fIargc\fR will be set by \fBTk_ParseArgv\fR to 2,
-\fIargv\fR[0] will be
-.QW prog ,
-\fIargv\fR[1] will be
-.QW infile ,
-and \fIargv\fR[2] will be NULL.
-.SH KEYWORDS
-arguments, command line, options