system_data_types.7: Add uint_leastN_t family of types

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

man7/system_data_types.7

@@ -1500,6 +1500,81 @@ and
 .IR uint N _t
 types in this page.
 .RE
+.\"------------------------------------- uint_leastN_t ----------------/
+.TP
+.IR uint_least N _t
+.RS
+Include:
+.IR <stdint.h> .
+Alternatively,
+.IR <inttypes.h> .
+.PP
+.IR uint_least8_t ,
+.IR uint_least16_t ,
+.IR uint_least32_t ,
+.I uint_least64_t
+.PP
+The narrowest 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_LEAST N _MAX ],
+substituting N by the appropriate number.
+.PP
+The length modifiers for the
+.IR uint_least N _t
+types for the
+.BR printf (3)
+family of functions
+are expanded by macros of the forms
+.BR PRIuLEST N,
+.BR PRIoLEAST N,
+.BR PRIxLEAST N
+and
+.BR PRIXLEAST N
+(defined in
+.IR <inttypes.h> );
+resulting for example in
+.B %"PRIuLEAST32"
+or
+.B %"PRIxLEAST32"
+for printing
+.I uint_least32_t
+values.
+The length modifiers for the
+.IR uint_least N _t
+types for the
+.BR scanf (3)
+family of functions
+are expanded by macros of the forms
+.BR SCNuLEAST N,
+.BR SCNoLEAST N,
+.BR SCNxLEAST N
+and
+.BR SCNXLEAST N
+(defined in
+.IR <inttypes.h> );
+resulting for example in
+.B %"SCNuLEAST16"
+or
+.B %"SCNxLEAST16"
+for scanning
+.I uint_least16_t
+values.
+.PP
+Conforming to:
+C99 and later; POSIX.1-2001 and later.
+.PP
+See also the
+.IR int_fast N _t ,
+.IR int_least N _t ,
+.IR int N _t ,
+.IR uint_fast N _t
+and
+.IR uint N _t
+types in this page.
+.RE
 .\"------------------------------------- uintmax_t --------------------/
 .TP
 .I uintmax_t