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-.\" $OpenBSD: ecvt.3,v 1.13 2019/01/25 00:19:25 millert Exp $
-.\"
-.\" Copyright (c) 2002 Todd C. Miller <millert@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, 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.
-.\"
-.\" Sponsored in part by the Defense Advanced Research Projects
-.\" Agency (DARPA) and Air Force Research Laboratory, Air Force
-.\" Materiel Command, USAF, under agreement number F39502-99-1-0512.
-.\"
-.Dd $Mdocdate: January 25 2019 $
-.Dt ECVT 3
-.Os
-.Sh NAME
-.Nm ecvt ,
-.Nm fcvt ,
-.Nm gcvt
-.Nd convert double to ASCII string
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft char *
-.Fn ecvt "double value" "int ndigit" "int *decpt" "int *sign"
-.Ft char *
-.Fn fcvt "double value" "int ndigit" "int *decpt" "int *sign"
-.Ft char *
-.Fn gcvt "double value" "int ndigit" "char *buf"
-.Sh DESCRIPTION
-.Bf -symbolic
-These functions are provided for compatibility with legacy code.
-New code should use the
-.Xr snprintf 3
-function for improved safety and portability.
-.Ef
-.Pp
-The
-.Fn ecvt ,
-.Fn fcvt
-and
-.Fn gcvt
-functions convert the double precision floating-point number
-.Fa value
-to a NUL-terminated
-.Tn ASCII
-string.
-.Pp
-The
-.Fn ecvt
-function converts
-.Fa value
-to a NUL-terminated string of exactly
-.Fa ndigit
-digits and returns a pointer to that string.
-The result is padded with zeroes from left to right as needed.
-There are no leading zeroes unless
-.Fa value
-itself is 0.
-The least significant digit is rounded in an implementation-dependent manner.
-The position of the decimal point relative to the beginning of the string
-is stored in
-.Fa decpt .
-A negative value indicates that the decimal point is located
-to the left of the returned digits (this occurs when there is no
-whole number component to
-.Fa value ) .
-If
-.Fa value
-is zero, it is unspecified whether the integer pointed to by
-.Fa decpt
-will be 0 or 1.
-The decimal point itself is not included in the returned string.
-If the sign of the result is negative, the integer pointed to by
-.Fa sign
-is non-zero; otherwise, it is 0.
-.Pp
-If the converted value is out of range or is not representable,
-the contents of the returned string are unspecified.
-.Pp
-The
-.Fn fcvt
-function is identical to
-.Fn ecvt
-with the exception that
-.Fa ndigit
-specifies the number of digits after the decimal point (zero-padded as
-needed).
-.Pp
-The
-.Fn gcvt
-function converts
-.Fa value
-to a NUL-terminated string similar to the %g
-.Xr printf 3
-format specifier and stores the result in
-.Fa buf .
-It produces
-.Fa ndigit
-significant digits similar to the %f
-.Xr printf 3
-format specifier where possible.
-If
-.Fa ndigit
-does allow sufficient precision, the result is stored in
-exponential notation similar to the %e
-.Xr printf 3
-format specifier.
-If
-.Fa value
-is less than zero,
-.Fa buf
-will be prefixed with a minus sign.
-A decimal point is included in the returned string if
-.Fa value
-is not a whole number.
-Unlike the
-.Fn ecvt
-and
-.Fn fcvt
-functions,
-.Fa buf
-is not zero-padded.
-.Sh RETURN VALUES
-The
-.Fn ecvt ,
-.Fn fcvt
-and
-.Fn gcvt
-functions return a NUL-terminated string representation of
-.Fa value .
-.Sh SEE ALSO
-.Xr printf 3 ,
-.Xr strtod 3
-.Sh STANDARDS
-The
-.Fn ecvt ,
-.Fn fcvt
-and
-.Fn gcvt
-functions conform to
-.St -p1003.1-2001 ;
-as of
-.St -p1003.1-2008
-they are no longer a part of the standard.
-.Sh CAVEATS
-The
-.Fn ecvt
-and
-.Fn fcvt
-functions return a pointer to internal storage space that will be
-overwritten by subsequent calls to either function.
-.Pp
-The maximum possible precision of the return value is limited by the
-precision of a double and may not be the same on all architectures.
-.Pp
-The
-.Xr snprintf 3
-function is preferred over these functions for new code.