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-rw-r--r-- | doc/Interp.3 | 250 |
1 files changed, 125 insertions, 125 deletions
diff --git a/doc/Interp.3 b/doc/Interp.3 index 9ee66f9..2b7d48a 100644 --- a/doc/Interp.3 +++ b/doc/Interp.3 @@ -1,125 +1,125 @@ -'\"
-'\" Copyright (c) 1989-1993 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.
-'\"
-'\" RCS: @(#) $Id: Interp.3,v 1.10 2007/10/28 14:17:39 dkf Exp $
-'\"
-.so man.macros
-.TH Tcl_Interp 3 7.5 Tcl "Tcl Library Procedures"
-.BS
-.SH NAME
-Tcl_Interp \- client-visible fields of interpreter structures
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-typedef struct {
- char *\fIresult\fR;
- Tcl_FreeProc *\fIfreeProc\fR;
- int \fIerrorLine\fR;
-} Tcl_Interp;
-
-typedef void Tcl_FreeProc(char *\fIblockPtr\fR);
-.BE
-
-.SH DESCRIPTION
-.PP
-The \fBTcl_CreateInterp\fR procedure returns a pointer to a Tcl_Interp
-structure. This pointer is then passed into other Tcl procedures
-to process commands in the interpreter and perform other operations
-on the interpreter. Interpreter structures contain many fields
-that are used by Tcl, but only three that may be accessed by
-clients: \fIresult\fR, \fIfreeProc\fR, and \fIerrorLine\fR.
-.PP
-\fBNote that access to the \fIresult\fB and \fIfreeProc\fB fields is\fR
-\fBdeprecated.\fR Use \fBTcl_SetResult\fR and \fBTcl_GetResult\fR instead.
-.PP
-The \fIresult\fR and \fIfreeProc\fR fields are used to return
-results or error messages from commands.
-This information is returned by command procedures back to \fBTcl_Eval\fR,
-and by \fBTcl_Eval\fR back to its callers.
-The \fIresult\fR field points to the string that represents the
-result or error message, and the \fIfreeProc\fR field tells how
-to dispose of the storage for the string when it is not needed anymore.
-The easiest way for command procedures to manipulate these
-fields is to call procedures like \fBTcl_SetResult\fR
-or \fBTcl_AppendResult\fR; they
-will hide all the details of managing the fields.
-The description below is for those procedures that manipulate the
-fields directly.
-.PP
-Whenever a command procedure returns, it must ensure
-that the \fIresult\fR field of its interpreter points to the string
-being returned by the command.
-The \fIresult\fR field must always point to a valid string.
-If a command wishes to return no result then \fIinterp->result\fR
-should point to an empty string.
-Normally, results are assumed to be statically allocated,
-which means that the contents will not change before the next time
-\fBTcl_Eval\fR is called or some other command procedure is invoked.
-In this case, the \fIfreeProc\fR field must be zero.
-Alternatively, a command procedure may dynamically
-allocate its return value (e.g. using \fBTcl_Alloc\fR)
-and store a pointer to it in \fIinterp->result\fR.
-In this case, the command procedure must also set \fIinterp->freeProc\fR
-to the address of a procedure that can free the value, or \fBTCL_DYNAMIC\fR
-if the storage was allocated directly by Tcl or by a call to
-\fBTcl_Alloc\fR.
-If \fIinterp->freeProc\fR is non-zero, then Tcl will call \fIfreeProc\fR
-to free the space pointed to by \fIinterp->result\fR before it
-invokes the next command.
-If a client procedure overwrites \fIinterp->result\fR when
-\fIinterp->freeProc\fR is non-zero, then it is responsible for calling
-\fIfreeProc\fR to free the old \fIinterp->result\fR (the \fBTcl_FreeResult\fR
-macro should be used for this purpose).
-.PP
-\fIFreeProc\fR should have arguments and result that match the
-\fBTcl_FreeProc\fR declaration above: it receives a single
-argument which is a pointer to the result value to free.
-In most applications \fBTCL_DYNAMIC\fR is the only non-zero value ever
-used for \fIfreeProc\fR.
-However, an application may store a different procedure address
-in \fIfreeProc\fR in order to use an alternate memory allocator
-or in order to do other cleanup when the result memory is freed.
-.PP
-As part of processing each command, \fBTcl_Eval\fR initializes
-\fIinterp->result\fR
-and \fIinterp->freeProc\fR just before calling the command procedure for
-the command. The \fIfreeProc\fR field will be initialized to zero,
-and \fIinterp->result\fR will point to an empty string. Commands that
-do not return any value can simply leave the fields alone.
-Furthermore, the empty string pointed to by \fIresult\fR is actually
-part of an array of \fBTCL_RESULT_SIZE\fR characters (approximately 200).
-If a command wishes to return a short string, it can simply copy
-it to the area pointed to by \fIinterp->result\fR. Or, it can use
-the sprintf procedure to generate a short result string at the location
-pointed to by \fIinterp->result\fR.
-.PP
-It is a general convention in Tcl-based applications that the result
-of an interpreter is normally in the initialized state described
-in the previous paragraph.
-Procedures that manipulate an interpreter's result (e.g. by
-returning an error) will generally assume that the result
-has been initialized when the procedure is called.
-If such a procedure is to be called after the result has been
-changed, then \fBTcl_ResetResult\fR should be called first to
-reset the result to its initialized state. The direct use of
-\fIinterp->result\fR is strongly deprecated (see \fBTcl_SetResult\fR).
-.PP
-The \fIerrorLine\fR
-field is valid only after \fBTcl_Eval\fR returns
-a \fBTCL_ERROR\fR return code. In this situation the \fIerrorLine\fR
-field identifies the line number of the command being executed when
-the error occurred. The line numbers are relative to the command
-being executed: 1 means the first line of the command passed to
-\fBTcl_Eval\fR, 2 means the second line, and so on.
-The \fIerrorLine\fR field is typically used in conjunction with
-\fBTcl_AddErrorInfo\fR to report information about where an error
-occurred.
-\fIErrorLine\fR should not normally be modified except by \fBTcl_Eval\fR.
-
-.SH KEYWORDS
-free, initialized, interpreter, malloc, result
+'\" +'\" Copyright (c) 1989-1993 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. +'\" +'\" RCS: @(#) $Id: Interp.3,v 1.11 2007/10/29 17:17:54 dgp Exp $ +'\" +.so man.macros +.TH Tcl_Interp 3 7.5 Tcl "Tcl Library Procedures" +.BS +.SH NAME +Tcl_Interp \- client-visible fields of interpreter structures +.SH SYNOPSIS +.nf +\fB#include <tcl.h>\fR +.sp +typedef struct { + char *\fIresult\fR; + Tcl_FreeProc *\fIfreeProc\fR; + int \fIerrorLine\fR; +} Tcl_Interp; + +typedef void Tcl_FreeProc(char *\fIblockPtr\fR); +.BE + +.SH DESCRIPTION +.PP +The \fBTcl_CreateInterp\fR procedure returns a pointer to a Tcl_Interp +structure. This pointer is then passed into other Tcl procedures +to process commands in the interpreter and perform other operations +on the interpreter. Interpreter structures contain many fields +that are used by Tcl, but only three that may be accessed by +clients: \fIresult\fR, \fIfreeProc\fR, and \fIerrorLine\fR. +.PP +\fBNote that access to the \fIresult\fB and \fIfreeProc\fB fields is\fR +\fBdeprecated.\fR Use \fBTcl_SetResult\fR and \fBTcl_GetResult\fR instead. +.PP +The \fIresult\fR and \fIfreeProc\fR fields are used to return +results or error messages from commands. +This information is returned by command procedures back to \fBTcl_Eval\fR, +and by \fBTcl_Eval\fR back to its callers. +The \fIresult\fR field points to the string that represents the +result or error message, and the \fIfreeProc\fR field tells how +to dispose of the storage for the string when it is not needed anymore. +The easiest way for command procedures to manipulate these +fields is to call procedures like \fBTcl_SetResult\fR +or \fBTcl_AppendResult\fR; they +will hide all the details of managing the fields. +The description below is for those procedures that manipulate the +fields directly. +.PP +Whenever a command procedure returns, it must ensure +that the \fIresult\fR field of its interpreter points to the string +being returned by the command. +The \fIresult\fR field must always point to a valid string. +If a command wishes to return no result then \fIinterp->result\fR +should point to an empty string. +Normally, results are assumed to be statically allocated, +which means that the contents will not change before the next time +\fBTcl_Eval\fR is called or some other command procedure is invoked. +In this case, the \fIfreeProc\fR field must be zero. +Alternatively, a command procedure may dynamically +allocate its return value (e.g. using \fBTcl_Alloc\fR) +and store a pointer to it in \fIinterp->result\fR. +In this case, the command procedure must also set \fIinterp->freeProc\fR +to the address of a procedure that can free the value, or \fBTCL_DYNAMIC\fR +if the storage was allocated directly by Tcl or by a call to +\fBTcl_Alloc\fR. +If \fIinterp->freeProc\fR is non-zero, then Tcl will call \fIfreeProc\fR +to free the space pointed to by \fIinterp->result\fR before it +invokes the next command. +If a client procedure overwrites \fIinterp->result\fR when +\fIinterp->freeProc\fR is non-zero, then it is responsible for calling +\fIfreeProc\fR to free the old \fIinterp->result\fR (the \fBTcl_FreeResult\fR +macro should be used for this purpose). +.PP +\fIFreeProc\fR should have arguments and result that match the +\fBTcl_FreeProc\fR declaration above: it receives a single +argument which is a pointer to the result value to free. +In most applications \fBTCL_DYNAMIC\fR is the only non-zero value ever +used for \fIfreeProc\fR. +However, an application may store a different procedure address +in \fIfreeProc\fR in order to use an alternate memory allocator +or in order to do other cleanup when the result memory is freed. +.PP +As part of processing each command, \fBTcl_Eval\fR initializes +\fIinterp->result\fR +and \fIinterp->freeProc\fR just before calling the command procedure for +the command. The \fIfreeProc\fR field will be initialized to zero, +and \fIinterp->result\fR will point to an empty string. Commands that +do not return any value can simply leave the fields alone. +Furthermore, the empty string pointed to by \fIresult\fR is actually +part of an array of \fBTCL_RESULT_SIZE\fR characters (approximately 200). +If a command wishes to return a short string, it can simply copy +it to the area pointed to by \fIinterp->result\fR. Or, it can use +the sprintf procedure to generate a short result string at the location +pointed to by \fIinterp->result\fR. +.PP +It is a general convention in Tcl-based applications that the result +of an interpreter is normally in the initialized state described +in the previous paragraph. +Procedures that manipulate an interpreter's result (e.g. by +returning an error) will generally assume that the result +has been initialized when the procedure is called. +If such a procedure is to be called after the result has been +changed, then \fBTcl_ResetResult\fR should be called first to +reset the result to its initialized state. The direct use of +\fIinterp->result\fR is strongly deprecated (see \fBTcl_SetResult\fR). +.PP +The \fIerrorLine\fR +field is valid only after \fBTcl_Eval\fR returns +a \fBTCL_ERROR\fR return code. In this situation the \fIerrorLine\fR +field identifies the line number of the command being executed when +the error occurred. The line numbers are relative to the command +being executed: 1 means the first line of the command passed to +\fBTcl_Eval\fR, 2 means the second line, and so on. +The \fIerrorLine\fR field is typically used in conjunction with +\fBTcl_AddErrorInfo\fR to report information about where an error +occurred. +\fIErrorLine\fR should not normally be modified except by \fBTcl_Eval\fR. + +.SH KEYWORDS +free, initialized, interpreter, malloc, result |