95 lines
3.9 KiB
Groff
95 lines
3.9 KiB
Groff
'\"
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'\" Copyright (c) 1989-1993 The Regents of the University of California.
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'\" All rights reserved.
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'\"
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'\" Permission is hereby granted, without written agreement and without
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'\" documentation for any purpose, provided that the above copyright
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'\" notice and the following two paragraphs appear in all copies.
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'\"
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'\" IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
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'\" FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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'\" ARISING OUT OF THE USE OF THIS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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'\"
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'\" THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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'\"
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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)
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'\"
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.so man.macros
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.HS Tcl_GetInt tclc
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.BS
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.SH NAME
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Tcl_GetInt, Tcl_GetDouble, Tcl_GetBoolean \- convert from string to integer, double, or boolean
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.SH SYNOPSIS
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.nf
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\fB#include <tcl.h>\fR
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.sp
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int
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\fBTcl_GetInt\fR(\fIinterp, string, intPtr\fR)
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.sp
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int
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\fBTcl_GetDouble\fR(\fIinterp, string, doublePtr\fR)
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.sp
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int
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\fBTcl_GetBoolean\fR(\fIinterp, string, boolPtr\fR)
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.SH ARGUMENTS
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.AS Tcl_Interp *doublePtr
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.AP Tcl_Interp *interp in
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Interpreter to use for error reporting.
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.AP char *string in
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Textual value to be converted.
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.AP int *intPtr out
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Points to place to store integer value converted from \fIstring\fR.
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.AP double *doublePtr out
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Points to place to store double-precision floating-point
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value converted from \fIstring\fR.
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.AP int *boolPtr out
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Points to place to store boolean value (0 or 1) converted from \fIstring\fR.
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.BE
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.SH DESCRIPTION
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.PP
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These procedures convert from strings to integers or double-precision
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floating-point values or booleans (represented as 0- or 1-valued
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integers). Each of the procedures takes a \fIstring\fR argument,
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converts it to an internal form of a particular type, and stores
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the converted value at the location indicated by the procedure's
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third argument. If all goes well, each of the procedures returns
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TCL_OK. If \fIstring\fR doesn't have the proper syntax for the
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desired type then TCL_ERROR is returned, an error message is left
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in \fIinterp->result\fR, and nothing is stored at *\fIintPtr\fR
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or *\fIdoublePtr\fR or *\fIboolPtr\fR.
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.PP
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\fBTcl_GetInt\fR expects \fIstring\fR to consist of a collection
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of integer digits, optionally signed and optionally preceded by
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white space. If the first two characters of \fIstring\fR are ``0x''
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then \fIstring\fR is expected to be in hexadecimal form; otherwise,
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if the first character of \fIstring\fR is ``0'' then \fIstring\fR
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is expected to be in octal form; otherwise, \fIstring\fR is
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expected to be in decimal form.
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.PP
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\fBTcl_GetDouble\fR expects \fIstring\fR to consist of a floating-point
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number, which is: white space; a sign; a sequence of digits; a
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decimal point; a sequence of digits; the letter ``e''; and a
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signed decimal exponent. Any of the fields may be omitted, except that
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the digits either before or after the decimal point must be present
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and if the ``e'' is present then it must be followed by the
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exponent number.
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.PP
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\fBTcl_GetBoolean\fR expects \fIstring\fR to specify a boolean
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value. If \fIstring\fR is any of \fB0\fR, \fBfalse\fR,
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\fBno\fR, or \fBoff\fR, then \fBTcl_GetBoolean\fR stores a zero
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value at \fI*boolPtr\fR.
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If \fIstring\fR is any of \fB1\fR, \fBtrue\fR, \fByes\fR, or \fBon\fR,
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then 1 is stored at \fI*boolPtr\fR.
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Any of these values may be abbreviated, and upper-case spellings
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are also acceptable.
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.SH KEYWORDS
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boolean, conversion, double, floating-point, integer
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