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-'\" t
-.\" Copyright (c) 2016, IBM Corporation.
-.\" Written by Wainer dos Santos Moschetta <wainersm@linux.vnet.ibm.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\" glibc 2.25 source code and manual.
-.\" C99 standard document.
-.\" ISO/IEC TS 18661-1 technical specification.
-.\" snprintf and other man.3 pages.
-.\"
-.TH strfromd 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-strfromd, strfromf, strfroml \- convert a floating-point value into
-a string
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.P
-.BI "int strfromd(char " str "[restrict ." n "], size_t " n ,
-.BI " const char *restrict " format ", double " fp ");"
-.BI "int strfromf(char " str "[restrict ." n "], size_t " n ,
-.BI " const char *restrict " format ", float "fp ");"
-.BI "int strfroml(char " str "[restrict ." n "], size_t " n ,
-.BI " const char *restrict " format ", long double " fp ");"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR strfromd (),
-.BR strfromf (),
-.BR strfroml ():
-.nf
- __STDC_WANT_IEC_60559_BFP_EXT__
-.fi
-.SH DESCRIPTION
-These functions convert a floating-point value,
-.IR fp ,
-into a string of characters,
-.IR str ,
-with a configurable
-.I format
-string.
-At most
-.I n
-characters are stored into
-.IR str .
-.P
-The terminating null byte ('\e0') is written if and only if
-.I n
-is sufficiently large, otherwise the written string is truncated at
-.I n
-characters.
-.P
-The
-.BR strfromd (),
-.BR strfromf (),
-and
-.BR strfroml ()
-functions are equivalent to
-.P
-.in +4n
-.EX
-snprintf(str, n, format, fp);
-.EE
-.in
-.P
-except for the
-.I format
-string.
-.SS Format of the format string
-The
-.I format
-string must start with the character \[aq]%\[aq].
-This is followed by an optional precision which starts with the period
-character (.), followed by an optional decimal integer.
-If no integer is specified after the period character,
-a precision of zero is used.
-Finally, the format string should have one of the conversion specifiers
-.BR a ,
-.BR A ,
-.BR e ,
-.BR E ,
-.BR f ,
-.BR F ,
-.BR g ,
-or
-.BR G .
-.P
-The conversion specifier is applied based on the floating-point type
-indicated by the function suffix.
-Therefore, unlike
-.BR snprintf (),
-the format string does not have a length modifier character.
-See
-.BR snprintf (3)
-for a detailed description of these conversion specifiers.
-.P
-The implementation conforms to the C99 standard on conversion of NaN and
-infinity values:
-.P
-.RS
-If
-.I fp
-is a NaN, +NaN, or \-NaN, and
-.B f
-(or
-.BR a ,
-.BR e ,
-.BR g )
-is the conversion specifier, the conversion is to "nan", "nan", or "\-nan",
-respectively.
-If
-.B F
-(or
-.BR A ,
-.BR E ,
-.BR G )
-is the conversion specifier, the conversion is to "NAN" or "\-NAN".
-.P
-Likewise if
-.I fp
-is infinity, it is converted to [\-]inf or [\-]INF.
-.RE
-.P
-A malformed
-.I format
-string results in undefined behavior.
-.SH RETURN VALUE
-The
-.BR strfromd (),
-.BR strfromf (),
-and
-.BR strfroml ()
-functions return the number of characters that would have been written in
-.I str
-if
-.I n
-had enough space,
-not counting the terminating null byte.
-Thus, a return value of
-.I n
-or greater means that the output was truncated.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7)
-and the
-.B POSIX Safety Concepts
-section in GNU C Library manual.
-.P
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR strfromd (),
-.BR strfromf (),
-.BR strfroml ()
-T} Thread safety MT-Safe locale
-\^ Async-signal safety AS-Unsafe heap
-\^ Async-cancel safety AC-Unsafe mem
-.TE
-.P
-Note: these attributes are preliminary.
-.SH STANDARDS
-ISO/IEC TS 18661-1.
-.SH VERSIONS
-.TP
-.BR strfromd ()
-.TQ
-.BR strfromf ()
-.TQ
-.BR strfroml ()
-glibc 2.25.
-.SH NOTES
-These functions take account of the
-.B LC_NUMERIC
-category of the current locale.
-.SH EXAMPLES
-To convert the value 12.1 as a float type to a string using decimal
-notation, resulting in "12.100000":
-.P
-.in +4n
-.EX
-#define __STDC_WANT_IEC_60559_BFP_EXT__
-#include <stdlib.h>
-int ssize = 10;
-char s[ssize];
-strfromf(s, ssize, "%f", 12.1);
-.EE
-.in
-.P
-To convert the value 12.3456 as a float type to a string using
-decimal notation with two digits of precision, resulting in "12.35":
-.P
-.in +4n
-.EX
-#define __STDC_WANT_IEC_60559_BFP_EXT__
-#include <stdlib.h>
-int ssize = 10;
-char s[ssize];
-strfromf(s, ssize, "%.2f", 12.3456);
-.EE
-.in
-.P
-To convert the value 12.345e19 as a double type to a string using
-scientific notation with zero digits of precision, resulting in "1E+20":
-.P
-.in +4n
-.EX
-#define __STDC_WANT_IEC_60559_BFP_EXT__
-#include <stdlib.h>
-int ssize = 10;
-char s[ssize];
-strfromd(s, ssize, "%.E", 12.345e19);
-.EE
-.in
-.SH SEE ALSO
-.BR atof (3),
-.BR snprintf (3),
-.BR strtod (3)