Libc-320.tar.gz

[apple/libc.git] / stdlib / atof.3

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-.\" Copyright (c) 1991, 1993
-.\"    The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"    This product includes software developed by the University of
-.\"    California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)atof.3     8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/stdlib/atof.3,v 1.12 2001/09/26 20:10:10 asmodai Exp $
-.\"
-.Dd June 4, 1993
-.Dt ATOF 3
-.Os
-.Sh NAME
-.Nm atof
-.Nd convert
-.Tn ASCII
-string to double
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft double
-.Fn atof "const char *nptr"
-.Sh DESCRIPTION
-The
-.Fn atof
-function converts the initial portion of the string pointed to by
-.Ar nptr
-to
-.Ar double
-representation.
-.Pp
-It is equivalent to:
-.Bd -literal -offset indent
-strtod(nptr, (char **)NULL);
-.Ed
-.Pp
-The decimal point
-character is defined in the program's locale (category
-.Dv LC_NUMERIC ) .
-.Sh IMPLEMENTATION NOTES
-The
-.Fn atof
-function is not thread-safe and also not async-cancel-safe.
-.Pp
-The
-.Fn atof
-function has been deprecated by
-.Fn strtod
-and should not be used in new code.
-.Sh ERRORS
-The
-.Fn atof
-function does not detect errors.
-.Sh SEE ALSO
-.Xr atoi 3 ,
-.Xr atol 3 ,
-.Xr strtod 3 ,
-.Xr strtol 3 ,
-.Xr strtoul 3
-.Sh STANDARDS
-The
-.Fn atof
-function conforms to
-.St -p1003.1-90 ,
-.St -isoC ,
-and
-.St -isoC-99 .