From: Alejandro Colomar <colomar.6.4.3@gmail.com>
Date: Thu, 1 Oct 2020 14:32:03 +0000 (+0200)
Subject: system_data_types.7: Add uint_fastN_t family of types
X-Git-Tag: man-pages-5.09~206
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c9ae6e5a264f1346260931132661cceb74f2539;p=thirdparty%2Fman-pages.git

system_data_types.7: Add uint_fastN_t family of types

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---

diff --git a/man7/system_data_types.7 b/man7/system_data_types.7
index c5d0b700d4..c130b72567 100644
--- a/man7/system_data_types.7
+++ b/man7/system_data_types.7
@@ -1348,6 +1348,86 @@ See also:
 .BR getpwnam (2),
 .BR credentials (7)
 .RE
+.\"------------------------------------- uint_fastN_t -----------------/
+.TP
+.IR uint_fast N _t
+.RS
+Include:
+.IR <stdint.h> .
+Alternatively,
+.IR <inttypes.h> .
+.PP
+.IR uint_fast8_t ,
+.IR uint_fast16_t ,
+.IR uint_fast32_t ,
+.I uint_fast64_t
+.PP
+Usually the fastest (see Notes) unsigned integer type
+of a width of at least N bits,
+N being the value specified in its type name.
+According to the C language standard, they shall be
+capable of storing values in the range [0,
+.BR UINT_FAST N _MAX ],
+substituting N by the appropriate number.
+.PP
+The length modifiers for the
+.IR uint_fast N _t
+types for the
+.BR printf (3)
+family of functions
+are expanded by macros of the forms
+.BR PRIuFAST N,
+.BR PRIoFAST N,
+.BR PRIxFAST N
+and
+.BR PRIXFAST N
+(defined in
+.IR <inttypes.h> );
+resulting for example in
+.B %"PRIuFAST32"
+or
+.B %"PRIxFAST32"
+for printing
+.I uint_fast32_t
+values.
+The length modifiers for the
+.IR uint_fast N _t
+types for the
+.BR scanf (3)
+family of functions
+are expanded by macros of the forms
+.BR SCNuFAST N,
+.BR SCNoFAST N,
+.BR SCNxFAST N
+and
+.BR SCNXFAST N
+(defined in
+.IR <inttypes.h> );
+resulting for example in
+.B %"SCNuFAST16"
+or
+.B %"SCNxFAST16"
+for scanning
+.I uint_fast16_t
+values.
+.PP
+Conforming to:
+C99 and later; POSIX.1-2001 and later.
+.PP
+Notes:
+Where there is no single type that is fastest for all purposes,
+the implementation may choose any type
+with the required signedness and at least the minimum width.
+.PP
+See also the
+.IR int_fast N _t ,
+.IR int_least N _t ,
+.IR int N _t ,
+.IR uint_least N _t
+and
+.IR uint N _t
+types in this page.
+.RE
 .\"------------------------------------- uintmax_t --------------------/
 .TP
 .I uintmax_t