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-.\" Copyright (c) 1990, 1991 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. 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.
-.\"
-.\"     $OpenBSD: strtod.3,v 1.23 2022/09/11 06:38:11 jmc Exp $
-.\"
-.Dd $Mdocdate: September 11 2022 $
-.Dt STRTOD 3
-.Os
-.Sh NAME
-.Nm strtod ,
-.Nm strtof ,
-.Nm strtold
-.Nd convert ASCII string to double, float or long double
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft double
-.Fn strtod "const char *nptr" "char **endptr"
-.Pp
-.Ft float
-.Fn strtof "const char *nptr" "char **endptr"
-.Pp
-.Ft long double
-.Fn strtold "const char *nptr" "char **endptr"
-.Sh DESCRIPTION
-The
-.Fn strtod
-function converts the initial portion of the string pointed to by
-.Fa nptr
-to
-.Vt double
-representation.
-The
-.Fn strtof
-function converts the initial portion of the string pointed to by
-.Fa nptr
-to
-.Vt float
-representation.
-The
-.Fn strtold
-function converts the initial portion of the string pointed to by
-.Fa nptr
-to
-.Vt long double
-representation.
-.Pp
-The expected form of the string is an optional plus
-.Pq Ql +
-or minus sign
-.Pq Ql -
-followed by a sequence of digits optionally containing
-a decimal-point character, optionally followed by an exponent.
-An exponent consists of an
-.Sq E
-or
-.Sq e ,
-followed by an optional plus or minus sign, followed by a sequence of digits.
-.Pp
-Alternatively, if the portion of the string following the optional
-plus or minus sign begins with
-.Dq INF
-or
-.Dq NAN ,
-ignoring case, it is interpreted as an infinity or a quiet \*(Na,
-respectively.
-The syntax
-.Dq NAN Ns Pq Ar s ,
-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 whitespace characters in the
-string (as defined by the
-.Xr isspace 3
-function) are skipped.
-.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
-is returned (according to the sign of the 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 strtol 3 ,
-.Xr strtoul 3
-.Sh STANDARDS
-The
-.Fn strtod
-function conforms to
-.St -ansiC-89 .
-The
-.Fn strtof
-and
-.Fn strtold
-functions conform to
-.St -isoC-99 .
-.Sh CAVEATS
-On systems other than
-.Ox ,
-the
-.Dv LC_NUMERIC
-.Xr locale 1
-category can cause parsing failures; see CAVEATS in
-.Xr setlocale 3
-for details.