mirror of https://github.com/mkerrisk/man-pages
102 lines
2.7 KiB
Groff
102 lines
2.7 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
|
|
.\"
|
|
.\" %%%LICENSE_START(VERBATIM)
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
.\" preserved on all copies.
|
|
.\"
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
.\" permission notice identical to this one.
|
|
.\"
|
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
.\" responsibility for errors or omissions, or for damages resulting from
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
.\" have taken the same level of care in the production of this manual,
|
|
.\" which is licensed free of charge, as they might when working
|
|
.\" professionally.
|
|
.\"
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
|
.\" %%%LICENSE_END
|
|
.\"
|
|
.\" References consulted:
|
|
.\" Linux libc source code
|
|
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
|
|
.\" 386BSD man pages
|
|
.\" Modified Sat Jul 24 19:32:25 1993 by Rik Faith (faith@cs.unc.edu)
|
|
.TH GCVT 3 2017-09-15 "" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
gcvt \- convert a floating-point number to a string
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B #include <stdlib.h>
|
|
.PP
|
|
.BI "char *gcvt(double " number ", int " ndigit ", char *" buf );
|
|
.fi
|
|
.PP
|
|
.RS -4
|
|
Feature Test Macro Requirements for glibc (see
|
|
.BR feature_test_macros (7)):
|
|
.RE
|
|
.PP
|
|
.BR gcvt ():
|
|
.ad l
|
|
.PD 0
|
|
.RS 4
|
|
.TP 4
|
|
Since glibc 2.12:
|
|
.nf
|
|
(_XOPEN_SOURCE\ >=\ 500) ! (_POSIX_C_SOURCE\ >=\ 200112L)
|
|
|| /* Glibc since 2.19: */ _DEFAULT_SOURCE
|
|
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE
|
|
.fi
|
|
.TP 4
|
|
Before glibc 2.12:
|
|
_SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
|
|
.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
|
|
.RE
|
|
.PD
|
|
.ad b
|
|
.SH DESCRIPTION
|
|
The
|
|
.BR gcvt ()
|
|
function converts \fInumber\fP to a minimal length null-terminated
|
|
ASCII string and stores the result in \fIbuf\fP.
|
|
It produces \fIndigit\fP significant digits in either
|
|
.BR printf (3)
|
|
F format or E format.
|
|
.SH RETURN VALUE
|
|
The
|
|
.BR gcvt ()
|
|
function returns
|
|
\fIbuf\fP.
|
|
.SH ATTRIBUTES
|
|
For an explanation of the terms used in this section, see
|
|
.BR attributes (7).
|
|
.TS
|
|
allbox;
|
|
lb lb lb
|
|
l l l.
|
|
Interface Attribute Value
|
|
T{
|
|
.BR gcvt ()
|
|
T} Thread safety MT-Safe
|
|
.TE
|
|
.sp 1
|
|
.SH CONFORMING TO
|
|
Marked as LEGACY in POSIX.1-2001.
|
|
POSIX.1-2008 removes the specification of
|
|
.BR gcvt (),
|
|
recommending the use of
|
|
.BR sprintf (3)
|
|
instead (though
|
|
.BR snprintf (3)
|
|
may be preferable).
|
|
.SH SEE ALSO
|
|
.BR ecvt (3),
|
|
.BR fcvt (3),
|
|
.BR sprintf (3)
|