Add `swab`

Make the overlap check pedantic only since some software seems to rely
on glibc working when src and dest are the same.

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/test_swab_overwrite_under.c b/tests/test_swab_overwrite_under.c
new file mode 100644
index 0000000..1d69545
--- /dev/null
+++ b/tests/test_swab_overwrite_under.c
@@ -0,0 +1,17 @@
+#define _XOPEN_SOURCE
+
+#include "common.h"
+
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+  char buffer[9] = {'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', '\0'};
+  puts(buffer);
+
+  CHK_FAIL_START
+  swab(buffer-1, buffer, 5);
+  CHK_FAIL_END
+
+  puts(buffer);
+  return ret;
+}