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+'\" t
+.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.\" References consulted:
+.\"     Linux libc source code
+.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
+.\"     386BSD man pages
+.\" Modified Sat Jul 24 19:40:39 1993 by Rik Faith (faith@cs.unc.edu)
+.\" Modified Fri Jun 25 12:10:47 1999 by Andries Brouwer (aeb@cwi.nl)
+.\"
+.TH ecvt 3 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+ecvt, fcvt \- convert a floating-point number to a string
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <stdlib.h>
+.P
+.BI "[[deprecated]] char *ecvt(double " number ", int " ndigits ,
+.BI "                          int *restrict " decpt ", int *restrict " sign );
+.BI "[[deprecated]] char *fcvt(double " number ", int " ndigits ,
+.BI "                          int *restrict " decpt ", int *restrict " sign );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.BR ecvt (),
+.BR fcvt ():
+.nf
+    Since glibc 2.17
+        (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200809L))
+            || /* glibc >= 2.20 */ _DEFAULT_SOURCE
+            || /* glibc <= 2.19 */ _SVID_SOURCE
+    glibc 2.12 to glibc 2.16:
+        (_XOPEN_SOURCE >= 500 && ! (_POSIX_C_SOURCE >= 200112L))
+            || _SVID_SOURCE
+    Before glibc 2.12:
+        _SVID_SOURCE || _XOPEN_SOURCE >= 500
+.\"        || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
+.fi
+.SH DESCRIPTION
+The
+.BR ecvt ()
+function converts \fInumber\fP to a null-terminated
+string of \fIndigits\fP digits (where \fIndigits\fP is reduced to a
+system-specific limit determined by the precision of a
+.IR double ),
+and returns a pointer to the string.
+The high-order digit is nonzero, unless
+.I number
+is zero.
+The low order digit is rounded.
+The string itself does not contain a decimal point; however,
+the position of the decimal point relative to the start of the string
+is stored in \fI*decpt\fP.
+A negative value for \fI*decpt\fP means that
+the decimal point is to the left of the start of the string.
+If the sign of
+\fInumber\fP is negative, \fI*sign\fP is set to a nonzero value,
+otherwise it is set to 0.
+If
+.I number
+is zero, it is unspecified whether \fI*decpt\fP is 0 or 1.
+.P
+The
+.BR fcvt ()
+function is identical to
+.BR ecvt (),
+except that
+\fIndigits\fP specifies the number of digits after the decimal point.
+.SH RETURN VALUE
+Both the
+.BR ecvt ()
+and
+.BR fcvt ()
+functions return a pointer to a
+static string containing the ASCII representation of \fInumber\fP.
+The static string is overwritten by each call to
+.BR ecvt ()
+or
+.BR fcvt ().
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR ecvt ()
+T}	Thread safety	MT-Unsafe race:ecvt
+T{
+.na
+.nh
+.BR fcvt ()
+T}	Thread safety	MT-Unsafe race:fcvt
+.TE
+.SH STANDARDS
+None.
+.SH HISTORY
+SVr2;
+marked as LEGACY in POSIX.1-2001.
+POSIX.1-2008 removes the specifications of
+.BR ecvt ()
+and
+.BR fcvt (),
+recommending the use of
+.BR sprintf (3)
+instead (though
+.BR snprintf (3)
+may be preferable).
+.SH NOTES
+.\" Linux libc4 and libc5 specified the type of
+.\" .I ndigits
+.\" as
+.\" .IR size_t .
+Not all locales use a point as the radix character ("decimal point").
+.SH SEE ALSO
+.BR ecvt_r (3),
+.BR gcvt (3),
+.BR qecvt (3),
+.BR setlocale (3),
+.BR sprintf (3)