Allow using snprintf() instead of sprintf() in wrappers

We aim to produce code that works with C90 or C++98 so we can't
assume snprintf() is available, but it almost always is (even
on systems from before it was standardised) so having a way to
use it is helpful.

Enable this automatically if the compiler claims conformance
with at least C90 or C++98 and check SWIG_HAVE_SNPRINTF to allow
turning on manually, but disable if SWIG_NO_SNPRINTF if defined.

The fallback is to call sprintf() without a buffer size check -
checking after the call is really shutting the stable door after
the horse has bolted, and most of our uses either have a fixed maximum
possible size or dynamically allocate a buffer that's large enough.

Fixes: #2502 (sprintf deprecation warnings on macos)
Fixes: #2548

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/d/dexception.swg b/Lib/d/dexception.swg
index 1aadbaada..74e0422b1 100644
--- a/Lib/d/dexception.swg
+++ b/Lib/d/dexception.swg
@@ -15,7 +15,7 @@
                  unsigned long,
                  unsigned short
 %{ char error_msg[256];
-   sprintf(error_msg, "C++ $1_type exception thrown, value: %d", $1);
+   SWIG_snprintf(error_msg, sizeof(error_msg), "C++ $1_type exception thrown, value: %d", $1);
    SWIG_DSetPendingException(SWIG_DException, error_msg);
    return $null; %}