Patch test code to make is more portable

Author: flanglet

src/test/TestAPI.c

@@ -22,52 +22,48 @@
 #ifndef PORTABLE_FMEMOPEN_H
 #define PORTABLE_FMEMOPEN_H
 
-#if defined(__APPLE__) || defined(__MACH__)
+#if defined(_WIN32)
 
-// macOS does not have fmemopen, but has funopen
+// Windows has no fmemopen
 static inline FILE* portable_fmemopen(void* buf, size_t size, const char* mode)
 {
-    (void)mode; // Only "wb" or "rb" used in tests
-
-    // Simple implementation: use a temporary file and preload the buffer
     FILE* f = tmpfile();
+
     if (!f)
         return NULL;
 
     if (buf && size > 0 && strchr(mode, 'w') == NULL) {
-        // reading: preload buffer
         fwrite(buf, 1, size, f);
         rewind(f);
     }
 
     return f;
 }
 
-#elif defined(_WIN32)
+#else
 
-// Windows also has no fmemopen
+// macOS does not have fmemopen, but has funopen
+// BSD may not have fmemopen
+// Most Linux distros do have fmemopen
 static inline FILE* portable_fmemopen(void* buf, size_t size, const char* mode)
 {
+    (void)mode; // Only "wb" or "rb" used in tests
+
+    // Simple implementation: use a temporary file and preload the buffer
     FILE* f = tmpfile();
+
     if (!f)
         return NULL;
 
     if (buf && size > 0 && strchr(mode, 'w') == NULL) {
+        // reading: preload buffer
         fwrite(buf, 1, size, f);
         rewind(f);
     }
 
     return f;
 }
 
-#else
-
-// Linux/glibc supports real fmemopen
-static inline FILE* portable_fmemopen(void* buf, size_t size, const char* mode)
-{
-    return fmemopen(buf, size, mode);
-}
-
 #endif
 
 #endif