DCMTK

Currently, DCMTK defines ssize_t on platforms that do not define it themselves, such as Windows, like this:

/* Define `ssize_t' to `long' if <sys/types.h> does not define. */
#define HAVE_NO_TYPEDEF_SSIZE_T
#ifdef HAVE_NO_TYPEDEF_SSIZE_T
#define ssize_t long
#endif

On 64-Bit Windows, however, size_t is a 64 bit integer, so ssize_t should also be 64 bit.
Windows actually has a typedef for SSIZE_T (in uppercase), which is defined as:

#if defined(_WIN64)
 typedef __int64 ssize_t;
#else
 typedef long ssize_t;
#endif 

A more comprehensive solution might be desirable to cover possible other 64-bit platforms where no ssize_t is defined. This may follow the definition of Sint64 in dcmtk/ofstd/oftypes.h, which however is also rather complex.

Reported 2024-07-15 by Helmut Steiner <helmut@shl.at>.