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float128: Add strfromf128, strtof128, and wcstof128 to the manual

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* manual/math.texi (Mathematics): Add description for _FloatN and
	_FloatNx types and mentions that they are not support in glibc for
	any architecture, so far.
	* manual/arith.texi (wcstof, wcstold): Replace the mention to
	stdlib.h with wchar.h.
	(Parsing of Floats): Add descriptions for strtofN and wcstofN.
	(Printing of Floats): Add description for strfromfN.
This commit is contained in:
Gabriel F. T. Gomes 2016-11-14 14:36:18 -02:00
parent 45f39d4588
commit 7d641c411d
3 changed files with 77 additions and 7 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2017-06-12 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
* manual/math.texi (Mathematics): Add description for _FloatN and
_FloatNx types and mentions that they are not support in glibc for
any architecture, so far.
* manual/arith.texi (wcstof, wcstold): Replace the mention to
stdlib.h with wchar.h.
(Parsing of Floats): Add descriptions for strtofN and wcstofN.
(Printing of Floats): Add description for strfromfN.
2017-06-12 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>

63
manual/arith.texi
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@ -2980,6 +2980,7 @@ examining @var{errno} and @var{tailptr}.
@comment ISO
@deftypefunx {long double} strtold (const char *@var{string}, char **@var{tailptr})
@safety{@prelim{}@mtsafe{@mtslocale{}}@assafe{}@acsafe{}}
@comment See safety comments for strtod.
These functions are analogous to @code{strtod}, but return @code{float}
and @code{long double} values respectively. They report errors in the
same way as @code{strtod}. @code{strtof} can be substantially faster
@ -2990,23 +2991,52 @@ double} is a separate type).
These functions have been GNU extensions and are new to @w{ISO C99}.
@end deftypefun
@comment stdlib.h
@comment ISO/IEC TS 18661-3
@deftypefun _FloatN strtofN (const char *@var{string}, char **@var{tailptr})
@comment stdlib.h
@comment ISO/IEC TS 18661-3
@deftypefunx _FloatNx strtofNx (const char *@var{string}, char **@var{tailptr})
@safety{@prelim{}@mtsafe{@mtslocale{}}@assafe{}@acsafe{}}
@comment See safety comments for strtod.
These functions are like @code{strtod}, except for the return type.
They were introduced in @w{ISO/IEC TS 18661-3} and are available on machines
that support the related types; @pxref{Mathematics}.
@end deftypefun
@comment wchar.h
@comment ISO
@deftypefun double wcstod (const wchar_t *restrict @var{string}, wchar_t **restrict @var{tailptr})
@comment stdlib.h
@comment wchar.h
@comment ISO
@deftypefunx float wcstof (const wchar_t *@var{string}, wchar_t **@var{tailptr})
@comment stdlib.h
@comment wchar.h
@comment ISO
@deftypefunx {long double} wcstold (const wchar_t *@var{string}, wchar_t **@var{tailptr})
@comment wchar.h
@comment GNU
@deftypefunx _FloatN wcstofN (const wchar_t *@var{string}, wchar_t **@var{tailptr})
@comment wchar.h
@comment GNU
@deftypefunx _FloatNx wcstofNx (const wchar_t *@var{string}, wchar_t **@var{tailptr})
@safety{@prelim{}@mtsafe{@mtslocale{}}@assafe{}@acsafe{}}
The @code{wcstod}, @code{wcstof}, and @code{wcstol} functions are
equivalent in nearly all aspect to the @code{strtod}, @code{strtof}, and
@code{strtold} functions but it handles wide character string.
@comment See safety comments for strtod.
The @code{wcstod}, @code{wcstof}, @code{wcstol}, @code{wcstof@var{N}},
and @code{wcstof@var{N}x} functions are equivalent in nearly all aspects
to the @code{strtod}, @code{strtof}, @code{strtold},
@code{strtof@var{N}}, and @code{strtof@var{N}x} functions, but they
handle wide character strings.
The @code{wcstod} function was introduced in @w{Amendment 1} of @w{ISO
C90}. The @code{wcstof} and @code{wcstold} functions were introduced in
@w{ISO C99}.
The @code{wcstof@var{N}} and @code{wcstof@var{N}x} functions are not in
any standard, but are added to provide completeness for the
non-deprecated interface of wide character string to floating-point
conversion functions. They are only available on machines that support
the related types; @pxref{Mathematics}.
@end deftypefun
@comment stdlib.h
@ -3033,11 +3063,15 @@ The @samp{strfrom} functions are declared in @file{stdlib.h}.
@comment stdlib.h
@comment ISO/IEC TS 18661-1
@deftypefun int strfromd (char *restrict @var{string}, size_t @var{size}, const char *restrict @var{format}, double @var{value})
@comment stdlib.h
@comment ISO/IEC TS 18661-1
@deftypefunx int strfromf (char *restrict @var{string}, size_t @var{size}, const char *restrict @var{format}, float @var{value})
@comment stdlib.h
@comment ISO/IEC TS 18661-1
@deftypefunx int strfroml (char *restrict @var{string}, size_t @var{size}, const char *restrict @var{format}, long double @var{value})
@safety{@prelim{}@mtsafe{@mtslocale{}}@asunsafe{@ascuheap{}}@acunsafe{@acsmem{}}}
@comment these functions depend on __printf_fp and __printf_fphex, which are
@comment AS-unsafe (ascuheap) and AC-unsafe (acsmem).
@comment All these functions depend on both __printf_fp and __printf_fphex,
@comment which are both AS-unsafe (ascuheap) and AC-unsafe (acsmem).
The functions @code{strfromd} (``string-from-double''), @code{strfromf}
(``string-from-float''), and @code{strfroml} (``string-from-long-double'')
convert the floating-point number @var{value} to a string of characters and
@ -3064,6 +3098,21 @@ has been completely written if and only if the returned value is less than
These functions were introduced by ISO/IEC TS 18661-1.
@end deftypefun
@comment stdlib.h
@comment ISO/IEC TS 18661-3
@deftypefun int strfromfN (char *restrict @var{string}, size_t @var{size}, const char *restrict @var{format}, _Float@var{N} @var{value})
@comment stdlib.h
@comment ISO/IEC TS 18661-3
@deftypefunx int strfromfNx (char *restrict @var{string}, size_t @var{size}, const char *restrict @var{format}, _Float@var{N}x @var{value})
@safety{@prelim{}@mtsafe{@mtslocale{}}@asunsafe{@ascuheap{}}@acunsafe{@acsmem{}}}
@comment See safety comments for strfromd.
These functions are like @code{strfromd}, except for the type of
@code{value}.
They were introduced in @w{ISO/IEC TS 18661-3} and are available on machines
that support the related types; @pxref{Mathematics}.
@end deftypefun
@node System V Number Conversion
@section Old-fashioned System V number-to-string functions

11
manual/math.texi
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@ -53,6 +53,17 @@ usually wise to pick the narrowest type that can accommodate your data.
Not all machines have a distinct @code{long double} type; it may be the
same as @code{double}.
On some machines, @theglibc{} also provides @code{_Float@var{N}} and
@code{_Float@var{N}x} types. These types are defined in @w{ISO/IEC TS
18661-3}, which extends @w{ISO C} and defines floating-point types that
are not machine-dependent. When such a type, such as @code{_Float128},
is supported by @theglibc{}, extra variants for most of the mathematical
functions provided for @code{double}, @code{float}, and @code{long
double} are also provided for the supported type.
Currently, support for @code{_Float@var{N}} or @code{_Float@var{N}x}
types is not provided for any machine.
@menu
* Mathematical Constants:: Precise numeric values for often-used
constants.