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Manual Pages for UNIX Operating System command usage for man Tcl_SetVar2

Tcl Library Procedures Tcl_SetVar(3TCL)

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NAME

Tcl_SetVar2Ex, Tcl_SetVar, Tcl_SetVar2, Tcl_ObjSetVar2,

Tcl_GetVar2Ex, Tcl_GetVar, Tcl_GetVar2, Tcl_ObjGetVar2,

Tcl_UnsetVar, Tcl_UnsetVar2 - manipulate Tcl variables

SYNOPSIS

#include

Tcl_Obj * |

Tcl_SetVar2Ex(interp, name1, name2, newValuePtr, flags) |

CONST char *

Tcl_SetVar(interp, varName, newValue, flags)

CONST char *

Tcl_SetVar2(interp, name1, name2, newValue, flags)

Tcl_Obj *

Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, newValuePtr, flags)

Tcl_Obj * |

Tcl_GetVar2Ex(interp, name1, name2, flags) |

CONST char *

Tcl_GetVar(interp, varName, flags)

CONST char *

Tcl_GetVar2(interp, name1, name2, flags)

Tcl_Obj *

Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags)

int

Tcl_UnsetVar(interp, varName, flags)

int

Tcl_UnsetVar2(interp, name1, name2, flags)

ARGUMENTS

Tcl_Interp *interp (in) Interpreter containing

variable. CONST char *name1 (in) Contains the name of an array variable (if

name2 is non-NULL) or

(if name2 is NULL) either the name of a scalar variable or a

complete name includ-

ing both variable name Tcl Last change: 8.1 1

Tcl Library Procedures Tcl_SetVar(3TCL)

and index. May include :: namespace qualifiers to specify

a variable in a par-

ticular namespace.

CONST char *name2 (in) If non-NULL, gives

name of element within array; in this case name1 must refer to an array variable.

Tcl_Obj *newValuePtr (in) Points to a Tcl object |

containing the new |

value for the vari- |

able.

int flags (in) OR-ed combination of

bits providing addi-

tional information. See below for valid values. CONST char *varName (in) Name of variable. May include :: namespace qualifiers to specify

a variable in a par-

ticular namespace. May refer to a scalar variable or an element of an array.

CONST char *newValue (in) New value for vari-

able, specified as a

null-terminated

string. A copy of this value is stored in the variable.

Tcl_Obj *part1Ptr (in) Points to a Tcl object

containing the variable's name. The name may include a series of :: namespace qualifiers to specify

a variable in a par-

ticular namespace. May refer to a scalar variable or an element of an array variable.

Tcl_Obj *part2Ptr (in) If non-NULL, points to

Tcl Last change: 8.1 2

Tcl Library Procedures Tcl_SetVar(3TCL)

an object containing the name of an element within an array and part1Ptr must refer to an array variable.

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DESCRIPTION

These procedures are used to create, modify, read, and delete Tcl variables from C code.

Tcl_SetVar2Ex, Tcl_SetVar, Tcl_SetVar2, and Tcl_ObjSetVar2 |

will create a new variable or modify an existing one. These | procedures set the given variable to the value given by | newValuePtr or newValue and return a pointer to the | variable's new value, which is stored in Tcl's variable |

structure. Tcl_SetVar2Ex and Tcl_ObjSetVar2 take the new |

value as a Tcl_Obj and return a pointer to a Tcl_Obj. |

Tcl_SetVar and Tcl_SetVar2 take the new value as a string |

and return a string; they are usually less efficient than |

Tcl_ObjSetVar2. Note that the return value may be different |

than the newValuePtr or newValue argument, due to modifica-

tions made by write traces. If an error occurs in setting the variable (e.g. an array variable is referenced without giving an index into the array) NULL is returned and an error message is left in interp's result if the

TCL_LEAVE_ERR_MSG flag bit is set.

Tcl_GetVar2Ex, Tcl_GetVar, Tcl_GetVar2, and Tcl_ObjGetVar2 |

return the current value of a variable. The arguments to |

these procedures are treated in the same way as the argu- |

ments to the procedures described above. Under normal cir- |

cumstances, the return value is a pointer to the variable's |

value. For Tcl_GetVar2Ex and Tcl_ObjGetVar2 the value is |

returned as a pointer to a Tcl_Obj. For Tcl_GetVar and |

Tcl_GetVar2 the value is returned as a string; this is usu- |

ally less efficient, so Tcl_GetVar2Ex or Tcl_ObjGetVar2 are |

preferred. If an error occurs while reading the variable (e.g. the variable doesn't exist or an array element is specified for a scalar variable), then NULL is returned and an error message is left in interp's result if the

TCL_LEAVE_ERR_MSG flag bit is set.

Tcl_UnsetVar and Tcl_UnsetVar2 may be used to remove a vari-

able, so that future attempts to read the variable will return an error. The arguments to these procedures are treated in the same way as the arguments to the procedures

above. If the variable is successfully removed then TCL_OK

is returned. If the variable cannot be removed because it

doesn't exist then TCL_ERROR is returned and an error mes-

sage is left in interp's result if the TCL_LEAVE_ERR_MSG

Tcl Last change: 8.1 3

Tcl Library Procedures Tcl_SetVar(3TCL)

flag bit is set. If an array element is specified, the given element is removed but the array remains. If an array name is specified without an index, then the entire array is removed. The name of a variable may be specified to these procedures in four ways:

[1] If Tcl_SetVar, Tcl_GetVar, or Tcl_UnsetVar is invoked,

the variable name is given as a single string, varName. If varName contains an open parenthesis and ends with a close parenthesis, then the value between the parentheses is treated as an index (which can have any string value) and the characters before the first open

parenthesis are treated as the name of an array vari-

able. If varName doesn't have parentheses as described above, then the entire string is treated as the name of a scalar variable. [2] If the name1 and name2 arguments are provided and name2

is non-NULL, then an array element is specified and the

array name and index have already been separated by the caller: name1 contains the name and name2 contains the index. An error is generated if name1 contains an | open parenthesis and ends with a close parenthesis |

(array element) and name2 is non-NULL. |

[3] || If name2 is NULL, name1 is treated just like varName in | case [1] above (it can be either a scalar or an array | element variable name). The flags argument may be used to specify any of several

options to the procedures. It consists of an OR-ed combina-

tion of the following bits.

TCL_GLOBAL_ONLY

Under normal circumstances the procedures look up vari-

ables as follows. If a procedure call is active in interp, the variable is looked up at the current level of procedure call. Otherwise, the variable is looked up first in the current namespace, then in the global namespace. However, if this bit is set in flags then the variable is looked up only in the global namespace even if there is a procedure call active. If both

TCL_GLOBAL_ONLY and TCL_NAMESPACE_ONLY are given,

TCL_GLOBAL_ONLY is ignored.

TCL_NAMESPACE_ONLY

If this bit is set in flags then the variable is looked up only in the current namespace; if a procedure is active its variables are ignored, and the global Tcl Last change: 8.1 4

Tcl Library Procedures Tcl_SetVar(3TCL)

namespace is also ignored unless it is the current namespace.

TCL_LEAVE_ERR_MSG

If an error is returned and this bit is set in flags, then an error message will be left in the interpreter's

result, where it can be retrieved with Tcl_GetObjResult

or Tcl_GetStringResult. If this flag bit isn't set

then no error message is left and the interpreter's result will not be modified.

TCL_APPEND_VALUE

If this bit is set then newValuePtr or newValue is appended to the current value instead of replacing it. If the variable is currently undefined, then the bit is

ignored. This bit is only used by the Tcl_Set* pro-

cedures.

TCL_LIST_ELEMENT

If this bit is set, then newValue is converted to a valid Tcl list element before setting (or appending to) the variable. A separator space is appended before the new list element unless the list element is going to be the first element in a list or sublist (i.e. the

variable's current value is empty, or contains the sin-

gle character ``{'', or ends in `` }''). When append-

ing, the original value of the variable must also be a valid list, so that the operation is the appending of a new list element onto a list.

Tcl_GetVar and Tcl_GetVar2 return the current value of a

variable. The arguments to these procedures are treated in

the same way as the arguments to Tcl_SetVar and Tcl_SetVar2.

Under normal circumstances, the return value is a pointer to the variable's value (which is stored in Tcl's variable structure and will not change before the next call to

Tcl_SetVar or Tcl_SetVar2). Tcl_GetVar and Tcl_GetVar2 use

the flag bits TCL_GLOBAL_ONLY and TCL_LEAVE_ERR_MSG, both of

which have the same meaning as for Tcl_SetVar. If an error

occurs in reading the variable (e.g. the variable doesn't

exist or an array element is specified for a scalar vari-

able), then NULL is returned.

Tcl_UnsetVar and Tcl_UnsetVar2 may be used to remove a vari-

able, so that future calls to Tcl_GetVar or Tcl_GetVar2 for

the variable will return an error. The arguments to these procedures are treated in the same way as the arguments to

Tcl_GetVar and Tcl_GetVar2. If the variable is successfully

removed then TCL_OK is returned. If the variable cannot be

removed because it doesn't exist then TCL_ERROR is returned.

If an array element is specified, the given element is removed but the array remains. If an array name is Tcl Last change: 8.1 5

Tcl Library Procedures Tcl_SetVar(3TCL)

specified without an index, then the entire array is removed.

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

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| ATTRIBUTE TYPE | ATTRIBUTE VALUE|

|____________________|__________________|_

| Availability | runtime/tcl-8 |

|____________________|__________________|_

| Interface Stability| Uncommitted |

|____________________|_________________|

NOTES Source for Tcl is available on http://opensolaris.org. Tcl Last change: 8.1 6

Manual Pages for UNIX Operating System command usage for man Tcl_SetVar2

NAME

Tcl_SetVar2Ex, Tcl_SetVar, Tcl_SetVar2, Tcl_ObjSetVar2,

SYNOPSIS

Tcl_SetVar2Ex(interp, name1, name2, newValuePtr, flags) |

Tcl_SetVar2(interp, name1, name2, newValue, flags)

DESCRIPTION

Tcl_SetVar2Ex, Tcl_SetVar, Tcl_SetVar2, and Tcl_ObjSetVar2 |

structure. Tcl_SetVar2Ex and Tcl_ObjSetVar2 take the new |

Tcl_SetVar and Tcl_SetVar2 take the new value as a string |

doesn't exist then TCL_ERROR is returned and an error mes-

TCL_GLOBAL_ONLY and TCL_NAMESPACE_ONLY are given,

TCL_NAMESPACE_ONLY

the same way as the arguments to Tcl_SetVar and Tcl_SetVar2.

Tcl_SetVar or Tcl_SetVar2). Tcl_GetVar and Tcl_GetVar2 use

removed because it doesn't exist then TCL_ERROR is returned.

SEE ALSO

ATTRIBUTES

| ATTRIBUTE TYPE | ATTRIBUTE VALUE|