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Initial support for 'q' and 'Q' struct format codes: for now, only in

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native mode, and only when config #defines HAVE_LONG_LONG.  Standard mode
will eventually treat them as 8-byte ints across all platforms, but that
likely requires a new set of routines in longobject.c first (while
sizeof(long) >= 4 is guaranteed by C, there's nothing in C we can rely
on x-platform to hold 8 bytes of int, so we'll have to roll our own;
I'm thinking of a simple pair of conversion functions, Python long
to/from sized vector of unsigned bytes; that may be useful for GMP
conversions too; std q/Q would call them with size fixed at 8).

test_struct.py:  In addition to adding some native-mode 'q' and 'Q' tests,
got rid of unused code, and repaired a non-portable assumption about
native sizeof(short) (it isn't 2 on some Cray boxes).

libstruct.tex:  In addition to adding a bit of 'q'/'Q' docs (more needed
later), removed an erroneous footnote about 'I' behavior.
This commit is contained in:
Tim Peters 2001-06-10 23:40:19 +00:00
parent fcc54cab10
commit 7b9542a3f7
4 changed files with 247 additions and 16 deletions
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11
Doc/lib/libstruct.tex
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@ -53,9 +53,11 @@ C and Python values should be obvious given their types:
\lineiv{h}{\ctype{short}}{integer}{}
\lineiv{H}{\ctype{unsigned short}}{integer}{}
\lineiv{i}{\ctype{int}}{integer}{}
\lineiv{I}{\ctype{unsigned int}}{long}{(1)}
\lineiv{I}{\ctype{unsigned int}}{long}{}
\lineiv{l}{\ctype{long}}{integer}{}
\lineiv{L}{\ctype{unsigned long}}{long}{}
\lineiv{q}{\ctype{long long}}{long}{(1)}
\lineiv{Q}{\ctype{unsigned long long}}{long}{(1)}
\lineiv{f}{\ctype{float}}{float}{}
\lineiv{d}{\ctype{double}}{float}{}
\lineiv{s}{\ctype{char[]}}{string}{}
@ -68,10 +70,9 @@ Notes:
\begin{description}
\item[(1)]
The \character{I} conversion code will convert to a Python long if
the C \ctype{int} is the same size as a C \ctype{long}, which is
typical on most modern systems. If a C \ctype{int} is smaller than
a C \ctype{long}, an Python integer will be created instead.
The \character{q} and \character{Q} conversion codes are available in
native mode only if the platform C compiler supports C \ctype{long long},
or, on Windows, \ctype{__int64}.
\end{description}