CentOS 7.0 - man page for tcl_getboolean (centos section 3)

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Tcl_GetInt(3)			      Tcl Library Procedures			    Tcl_GetInt(3)


       Tcl_GetInt,  Tcl_GetDouble,  Tcl_GetBoolean  -  convert from string to integer, double, or

       #include <tcl.h>

       Tcl_GetInt(interp, src, intPtr)

       Tcl_GetDouble(interp, src, doublePtr)

       Tcl_GetBoolean(interp, src, boolPtr)

       Tcl_Interp *interp (in)		   Interpreter to use for error reporting.

       const char *src (in)		   Textual value to be converted.

       int *intPtr (out)		   Points to place to store integer value converted  from

       double *doublePtr (out)		   Points  to  place  to store double-precision floating-
					   point value converted from src.

       int *boolPtr (out)		   Points to place to store boolean value (0 or  1)  con-
					   verted from src.

       These  procedures convert from strings to integers or double-precision floating-point val-
       ues or booleans (represented as 0- or 1-valued integers).  Each of the procedures takes	a
       src  argument,  converts  it to an internal form of a particular type, and stores the con-
       verted value at the location indicated by the procedure's third	argument.   If	all  goes
       well,  each  of the procedures returns TCL_OK.  If src does not 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_GetInt expects src to consist of a collection of integer digits, optionally signed and
       optionally preceded by white space.  If the first two characters of src after the optional
       white  space and sign are "0x" then src is expected to be in hexadecimal form;  otherwise,
       if the first such character is "0" then src is expected to be in octal  form;   otherwise,
       src is expected to be in decimal form.

       Tcl_GetDouble  expects  src 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";	a
       signed  decimal exponent;  and more white space.  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 exponent number.

       Tcl_GetBoolean  expects src to specify a boolean value.	If src is any of 0, false, no, or
       off, then Tcl_GetBoolean stores a zero value at *boolPtr.  If src 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

Tcl										    Tcl_GetInt(3)
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