1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)digittoint.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD$ 34.\" 35.Dd April 6, 2001 36.Dt DIGITTOINT 3 37.Os 38.Sh NAME 39.Nm digittoint 40.Nd convert a numeric character to its integer value 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In ctype.h 45.Ft int 46.Fn digittoint "int c" 47.Sh DESCRIPTION 48The 49.Fn digittoint 50function converts a numeric character to its corresponding integer value. 51The character can be any decimal digit or hexadecimal digit. 52With hexadecimal characters, the case of the values does not matter. 53.Sh RETURN VALUES 54The 55.Fn digittoint 56function always returns an integer from the range of 0 to 15. 57If the given character was not a digit as defined by 58.Xr isxdigit 3 , 59the function will return 0. 60.Sh SEE ALSO 61.Xr isalnum 3 , 62.Xr isalpha 3 , 63.Xr isascii 3 , 64.Xr iscntrl 3 , 65.Xr isdigit 3 , 66.Xr isgraph 3 , 67.Xr islower 3 , 68.Xr isprint 3 , 69.Xr ispunct 3 , 70.Xr isspace 3 , 71.Xr isupper 3 , 72.Xr isxdigit 3 , 73.Xr stdio 3 , 74.Xr tolower 3 , 75.Xr toupper 3 , 76.Xr ascii 7 77