string_copying.7: Document strndup(3)

[thirdparty/man-pages.git] / man3 / gcvt.3

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-.\" 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-.\" manual page may be incorrect or out-of-date.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)