CentOS 7.0 - man page for tcl_substobj (centos section 3)
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Tcl_SubstObj(3) Tcl Library Procedures Tcl_SubstObj(3)
Tcl_SubstObj - perform substitutions on Tcl objects
Tcl_SubstObj(interp, objPtr, flags)
Tcl_Interp *interp (in) Interpreter in which to execute Tcl scripts and lookup
variables. If an error occurs, the interpreter's
result is modified to hold an error message.
Tcl_Obj *objPtr (in) A Tcl object containing the string to perform substitu-
int flags (in) ORed combination of flag bits that specify which sub-
stitutions to perform. The flags TCL_SUBST_COMMANDS,
TCL_SUBST_VARIABLES and TCL_SUBST_BACKSLASHES are cur-
rently supported, and TCL_SUBST_ALL is provided as a
convenience for the common case where all substitutions
The Tcl_SubstObj function is used to perform substitutions on strings in the fashion of
the subst command. It gets the value of the string contained in objPtr and scans it,
copying characters and performing the chosen substitutions as it goes to an output object
which is returned as the result of the function. In the event of an error occurring dur-
ing the execution of a command or variable substitution, the function returns NULL and an
error message is left in interp's result.
Three kinds of substitutions are supported. When the TCL_SUBST_BACKSLASHES bit is set in
flags, sequences that look like backslash substitutions for Tcl commands are replaced by
their corresponding character.
When the TCL_SUBST_VARIABLES bit is set in flags, sequences that look like variable sub-
stitutions for Tcl commands are replaced by the contents of the named variable.
When the TCL_SUBST_COMMANDS bit is set in flags, sequences that look like command substi-
tutions for Tcl commands are replaced by the result of evaluating that script. Where an
uncaught "continue exception" occurs during the evaluation of a command substitution, an
empty string is substituted for the command. Where an uncaught "break exception" occurs
during the evaluation of a command substitution, the result of the whole substitution on
objPtr will be truncated at the point immediately before the start of the command substi-
tution, and no characters will be added to the result or substitutions performed after
backslash substitution, command substitution, variable substitution
Tcl 8.4 Tcl_SubstObj(3)
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