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- '\" $Header: /user6/ouster/tcl/man/RCS/GetInt.3,v 1.8 93/04/01 09:25:29 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
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- .HS Tcl_GetInt tclc
- .BS
- .SH NAME
- Tcl_GetInt, Tcl_GetDouble, Tcl_GetBoolean \- convert from string to integer, double, or boolean
- .SH SYNOPSIS
- .nf
- \fB#include <tcl.h>\fR
- .sp
- int
- \fBTcl_GetInt\fR(\fIinterp, string, intPtr\fR)
- .sp
- int
- \fBTcl_GetDouble\fR(\fIinterp, string, doublePtr\fR)
- .sp
- int
- \fBTcl_GetBoolean\fR(\fIinterp, string, boolPtr\fR)
- .SH ARGUMENTS
- .AS Tcl_Interp *doublePtr
- .AP Tcl_Interp *interp in
- Interpreter to use for error reporting.
- .AP char *string in
- Textual value to be converted.
- .AP int *intPtr out
- Points to place to store integer value converted from \fIstring\fR.
- .AP double *doublePtr out
- Points to place to store double-precision floating-point
- value converted from \fIstring\fR.
- .AP int *boolPtr out
- Points to place to store boolean value (0 or 1) converted from \fIstring\fR.
- .BE
-
- .SH DESCRIPTION
- .PP
- 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 \fIstring\fR 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 \fIstring\fR doesn't have the proper syntax for the
- desired type then TCL_ERROR is returned, an error message is left
- in \fIinterp->result\fR, and nothing is stored at *\fIintPtr\fR
- or *\fIdoublePtr\fR or *\fIboolPtr\fR.
- .PP
- \fBTcl_GetInt\fR expects \fIstring\fR to consist of a collection
- of integer digits, optionally signed and optionally preceded by
- white space. If the first two characters of \fIstring\fR are ``0x''
- then \fIstring\fR is expected to be in hexadecimal form; otherwise,
- if the first character of \fIstring\fR is ``0'' then \fIstring\fR
- is expected to be in octal form; otherwise, \fIstring\fR is
- expected to be in decimal form.
- .PP
- \fBTcl_GetDouble\fR expects \fIstring\fR 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
- exponent number.
- .PP
- \fBTcl_GetBoolean\fR expects \fIstring\fR to specify a boolean
- value. If \fIstring\fR is any of \fB0\fR, \fBfalse\fR,
- \fBno\fR, or \fBoff\fR, then \fBTcl_GetBoolean\fR stores a zero
- value at \fI*boolPtr\fR.
- If \fIstring\fR is any of \fB1\fR, \fBtrue\fR, \fByes\fR, or \fBon\fR,
- then 1 is stored at \fI*boolPtr\fR.
- Any of these values may be abbreviated, and upper-case spellings
- are also acceptable.
-
- .SH KEYWORDS
- boolean, conversion, double, floating-point, integer
-