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Check if snprintf understands %zu.

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If the platforms snprintf and friends don't understand %zu, use the
compat replacement.  Prevents segfaults on those platforms.
This commit is contained in:
Darren Tucker 2018-10-12 16:43:35 +11:00
parent cf39f87519
commit e526127cbd
1 changed files with 23 additions and 0 deletions
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23
configure.ac
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@ -2110,6 +2110,29 @@ if test "x$ac_cv_func_snprintf" = "xyes" ; then
)
fi
if test "x$ac_cv_func_snprintf" = "xyes" ; then
AC_MSG_CHECKING([whether snprintf understands %zu])
AC_RUN_IFELSE(
[AC_LANG_PROGRAM([[
#include <sys/types.h>
#include <stdio.h>
]],
[[
size_t a = 1, b = 2;
char z[128];
snprintf(z, sizeof z, "%zu%zu", a, b);
exit(strcmp(z, "12"));
]])],
[AC_MSG_RESULT([yes])],
[
AC_MSG_RESULT([no])
AC_DEFINE([BROKEN_SNPRINTF], [1],
[snprintf does not understand %zu])
],
[ AC_MSG_WARN([cross compiling: Assuming working snprintf()]) ]
)
fi
# We depend on vsnprintf returning the right thing on overflow: the
# number of characters it tried to create (as per SUSv3)
if test "x$ac_cv_func_vsnprintf" = "xyes" ; then