+++ /dev/null
-.\" Copyright (c) 1990, 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.
-.\" 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.
-.\"
-.\" @(#)strtod.3 8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/stdlib/strtod.3,v 1.22 2007/12/16 21:19:28 das Exp $
-.\"
-.Dd March 2, 2003
-.Dt STRTOD 3
-.Os
-.Sh NAME
-.Nm strtod , strtof , strtold
-.Nd convert
-.Tn ASCII
-string to floating point
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft double
-.Fo strtod
-.Fa "const char *restrict nptr"
-.Fa "char **restrict endptr"
-.Fc
-.Ft float
-.Fo strtof
-.Fa "const char *restrict nptr"
-.Fa "char **restrict endptr"
-.Fc
-.Ft "long double"
-.Fo strtold
-.Fa "const char *restrict nptr"
-.Fa "char **restrict endptr"
-.Fc
-.Sh DESCRIPTION
-These conversion
-functions convert the initial portion of the string
-pointed to by
-.Fa nptr
-to
-.Vt double ,
-.Vt float ,
-and
-.Vt "long double"
-representation, respectively.
-.Pp
-The expected form of the string
-is an optional plus (``+'') or minus (``\-'') sign,
-followed by either:
-.Bl -bullet
-.It
-a decimal significand, consisting of a sequence of decimal digits
-(optionally containing a decimal-point character) or
-.It
-a hexadecimal significand, consisting of a ``0X'' or ``0x'' followed
-by a sequence of hexadecimal digits
-(optionally containing a decimal-point character).
-.El
-.Pp
-In both cases, the significand may be optionally followed by an
-exponent.
-An exponent consists of an ``E'' or ``e'' (for decimal
-constants) or a ``P'' or ``p'' (for hexadecimal constants),
-followed by an optional plus or minus sign, followed by a
-sequence of decimal digits.
-For decimal constants, the exponent indicates the power of 10 by
-which the significand should be scaled.
-For hexadecimal constants, the scaling is instead done by powers
-of 2.
-.Pp
-Alternatively, if the portion of the string following the optional
-plus or minus sign begins with
-.Dq INFINITY
-or
-.Dq NAN ,
-ignoring case, it is interpreted as an infinity or a quiet \*(Na,
-respectively.
-The syntax
-.Dq Xo Pf NAN( Ar "s" ) Xc ,
-where
-.Ar s
-is an alphanumeric string, produces the same value as the call
-.Fo nan
-.Qq Ar s Ns
-.Fc
-(respectively,
-.Fo nanf
-.Qq Ar s Ns
-.Fc
-and
-.Fo nanl
-.Qq Ar s Ns
-.Fc . )
-.Pp
-In any of the above cases, leading white-space characters in the
-string (as defined by the
-.Xr isspace 3
-function) are skipped.
-The decimal point
-character is defined in the program's locale (category
-.Dv LC_NUMERIC ) .
-.Pp
-Extended locale versions of these functions are documented in
-.Xr strtod_l 3 .
-See
-.Xr xlocale 3
-for more information.
-.Sh RETURN VALUES
-The
-.Fn strtod ,
-.Fn strtof ,
-and
-.Fn strtold
-functions return the converted value, if any.
-.Pp
-If
-.Fa endptr
-is not
-.Dv NULL ,
-a pointer to the character after the last character used
-in the conversion is stored in the location referenced by
-.Fa endptr .
-.Pp
-If no conversion is performed, zero is returned and the value of
-.Fa nptr
-is stored in the location referenced by
-.Fa endptr .
-.Pp
-If the correct value would cause overflow, plus or minus
-.Dv HUGE_VAL ,
-.Dv HUGE_VALF ,
-or
-.Dv HUGE_VALL
-is returned (according to the sign and type of the return value), and
-.Er ERANGE
-is stored in
-.Va errno .
-If the correct value would cause underflow, zero is
-returned and
-.Er ERANGE
-is stored in
-.Va errno .
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er ERANGE
-Overflow or underflow occurred.
-.El
-.Sh SEE ALSO
-.Xr atof 3 ,
-.Xr atoi 3 ,
-.Xr atol 3 ,
-.Xr nan 3 ,
-.Xr strtod_l 3 ,
-.Xr strtol 3 ,
-.Xr strtoul 3 ,
-.Xr wcstod 3
-.Sh STANDARDS
-The
-.Fn strtod
-function
-conforms to
-.St -isoC-99 .
-.Sh AUTHORS
-The author of this software is
-.An David M. Gay .
-.Pp
-.Bd -literal
-Copyright (c) 1998 by Lucent Technologies
-All Rights Reserved
-
-Permission to use, copy, modify, and distribute this software and
-its documentation for any purpose and without fee is hereby
-granted, provided that the above copyright notice appear in all
-copies and that both that the copyright notice and this
-permission notice and warranty disclaimer appear in supporting
-documentation, and that the name of Lucent or any of its entities
-not be used in advertising or publicity pertaining to
-distribution of the software without specific, written prior
-permission.
-
-LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
-INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
-IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
-SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
-IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
-ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
-THIS SOFTWARE.
-.Ed
projects / apple / libc.git / blobdiff