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| author | Darren Tucker <dtucker@dtucker.net> | 2018-10-12 16:43:35 +1100 |
|---|---|---|
| committer | Darren Tucker <dtucker@dtucker.net> | 2018-10-12 16:43:35 +1100 |
| commit | e526127cbd2f8ad88fb41229df0c9b850c722830 (patch) | |
| tree | 75c38b21102ba2980c33e101fb4f4c018c78522a | |
| parent | cf39f875191708c5f2f1a3c1c9019f106e74aea3 (diff) | |
| download | openssh-git-e526127cbd2f8ad88fb41229df0c9b850c722830.tar.gz | |
Check if snprintf understands %zu.
If the platforms snprintf and friends don't understand %zu, use the
compat replacement. Prevents segfaults on those platforms.
| -rw-r--r-- | configure.ac | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index c0e120fe..9dacccb2 100644 --- a/configure.ac +++ b/configure.ac @@ -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 |