Tcl_GetInt, Tcl_GetDouble, Tcl_GetBoolean - convert from string to integer, double, or boolean
Tcl_GetInt(interp, string, intPtr)
Tcl_GetDouble(interp, string, doublePtr)
Tcl_GetBoolean(interp, string, boolPtr)
These procedures convert from strings to integers or double-precision
floating-point values or booleans (represented as 0- or 1-valued
integers). Each of the procedures takes a string argument,
converts it to an internal form of a particular type, and stores
the converted value at the location indicated by the procedure's
third argument. If all goes well, each of the procedures returns
TCL_OK. If string doesn't have the proper syntax for the
desired type then TCL_ERROR is returned, an error message is left
in the interpreter's result, and nothing is stored at *intPtr
or *doublePtr or *boolPtr.
- Tcl_Interp *interp (in)
Interpreter to use for error reporting.
- char *string (in)
Textual value to be converted.
- int *intPtr (out)
Points to place to store integer value converted from string.
- double *doublePtr (out)
Points to place to store double-precision floating-point
value converted from string.
- int *boolPtr (out)
Points to place to store boolean value (0 or 1) converted from string.
Tcl_GetInt expects string to consist of a collection
of integer digits, optionally signed and optionally preceded by
white space. If the first two characters of string are ``0x''
then string is expected to be in hexadecimal form; otherwise,
if the first character of string is ``0'' then string
is expected to be in octal form; otherwise, string is
expected to be in decimal form.
Tcl_GetDouble expects string to consist of a floating-point
number, which is: white space; a sign; a sequence of digits; a
decimal point; a sequence of digits; the letter ``e''; and a
signed decimal exponent. Any of the fields may be omitted, except that
the digits either before or after the decimal point must be present
and if the ``e'' is present then it must be followed by the
Tcl_GetBoolean expects string to specify a boolean
value. If string is any of 0, false,
no, or off, then Tcl_GetBoolean stores a zero
value at *boolPtr.
If string is any of 1, true, yes, or on,
then 1 is stored at *boolPtr.
Any of these values may be abbreviated, and upper-case spellings
are also acceptable.
boolean, conversion, double, floating-point, integer
Copyright © 1989-1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.