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Document __utf16__ and __utf32__

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H. Peter Anvin 2008-06-14 21:21:17 -07:00
parent 05d124c30d
commit 5c657bdc12
1 changed files with 21 additions and 2 deletions
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23
doc/nasmdoc.src
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@ -205,6 +205,8 @@ Object File Format
\IR{unicode} Unicode
\IR{unix} Unix
\IR{utf-8} UTF-8
\IR{utf-16} UTF-16
\IR{utf-32} UTF-32
\IA{sco unix}{unix, sco}
\IR{unix, sco} Unix, SCO
\IA{unix source archive}{unix, source archive}
@ -1174,7 +1176,7 @@ are \i\c{DB}, \i\c{DW}, \i\c{DD}, \i\c{DQ}, \i\c{DT}, \i\c{DO} and
prefix.
\S{db} \c{DB} and friends: Declaring initialized Data
\S{db} \c{DB} and Friends: Declaring Initialized Data
\i\c{DB}, \i\c{DW}, \i\c{DD}, \i\c{DQ}, \i\c{DT}, \i\c{DO} and
\i\c{DY} are used, much as in MASM, to declare initialized data in the
@ -1198,7 +1200,7 @@ output file. They can be invoked in a wide range of ways:
\c{DT}, \c{DO} and \c{DY} do not accept \i{numeric constants} as operands.
\S{resb} \c{RESB} and friends: Declaring \i{Uninitialized} Data
\S{resb} \c{RESB} and Friends: Declaring \i{Uninitialized} Data
\i\c{RESB}, \i\c{RESW}, \i\c{RESD}, \i\c{RESQ}, \i\c{REST}, \i\c{RESO}
and \i\c{RESY} are designed to be used in the BSS section of a module:
@ -1487,6 +1489,23 @@ effect as \c{db 'a'}, which would be silly. Similarly, three-character
or four-character constants are treated as strings when they are
operands to \c{DW}, and so forth.
\S{unicode} \I{UTF-16}\I{UTF-32}Unicode Strings
The special operators \i\c{__utf16__} and \i\c{__utf32__} allows
definition of Unicode strings. They take a string in UTF-8 format and
converts it to (littleendian) UTF-16 or UTF-32, respectively.
For example:
\c %define u(x) __utf16__(x)
\c %define w(x) __utf32__(x)
\c
\c dw u('C:\WINDOWS'), 0 ; Pathname in UTF-16
\c dd w(`A + B = \u206a`), 0 ; String in UTF-32
\c{__utf16__} and \c{__utf32__} can be applied either to strings
passed to the \c{DB} family instructions, or to character constants in
an expression context.
\S{fltconst} \I{floating-point, constants}Floating-Point Constants