Merge pull request #352 from woolcoxm/fix/test-stops-windows

fix(test): make test_stops build on Windows (mkdtemp compat shim)

Conflict with #366's getenv_utf8 in compat.h resolved by keeping both blocks.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

c/compat.h

@@ -80,6 +80,7 @@ static inline int compat_open_direct(const char *path){
 #endif
 #include <windows.h>
 #include <io.h>
+#include <direct.h>   /* _mkdir (for the mkdtemp shim below) */
 #include <process.h>
 #include <malloc.h>
 #include <fcntl.h>
@@ -340,6 +341,19 @@ static inline const char *compat_getenv_utf8(const char *name){
 }
 #define getenv_utf8(name) compat_getenv_utf8(name)
 
+/* --- mkdtemp -> _mktemp + _mkdir (POSIX mkdtemp assente su Windows) ---
+ * Test binaries (test_stops.c) create a scratch dir in the CWD via a
+ * "name_XXXXXX" template; POSIX mkdtemp fills the X's and mkdirs 0700. The
+ * Windows CRT has _mktemp (in-place, same XXXXXX contract) so we compose it.
+ * Returns the template pointer on success, NULL on failure — matching POSIX. */
+static inline char *compat_mkdtemp(char *tmpl){
+    if(!tmpl) return NULL;
+    if(!_mktemp(tmpl)) return NULL;       /* fills the trailing X's in place */
+    if(_mkdir(tmpl) != 0) return NULL;    /* EEXIST is impossible post-_mktemp */
+    return tmpl;
+}
+#define mkdtemp(tmpl) compat_mkdtemp(tmpl)
+
 #endif /* _WIN32 */
 
 #ifndef getenv_utf8