Refactor dbp. NFC.

After this commit, dbp() is renamed to DebugPrint() and moved to
platform.cpp, next to other similar functions. The existing short
name is provided by a preprocessor macro, similar to ssassert().

This leaves just the (rather hacky) temporary heap in util*.cpp.

src/platform/platform.cpp

@@ -633,5 +633,53 @@ std::vector<std::string> InitCli(int argc, char **argv) {
 
 #endif
 
+//-----------------------------------------------------------------------------
+// Debug output, on *nix.
+//-----------------------------------------------------------------------------
+
+#if defined(WIN32)
+
+void DebugPrint(const char *fmt, ...)
+{
+    va_list va;
+    va_start(va, fmt);
+    int len = _vscprintf(fmt, va) + 1;
+    va_end(va);
+
+    va_start(va, fmt);
+    char *buf = (char *)_alloca(len);
+    _vsnprintf(buf, len, fmt, va);
+    va_end(va);
+
+    // The native version of OutputDebugString, unlike most others,
+    // is OutputDebugStringA.
+    OutputDebugStringA(buf);
+    OutputDebugStringA("\n");
+
+#ifndef NDEBUG
+    // Duplicate to stderr in debug builds, but not in release; this is slow.
+    fputs(buf, stderr);
+    fputc('\n', stderr);
+#endif
+}
+
+#endif
+
+//-----------------------------------------------------------------------------
+// Debug output, on *nix.
+//-----------------------------------------------------------------------------
+
+#if !defined(WIN32)
+
+void DebugPrint(const char *fmt, ...) {
+    va_list va;
+    va_start(va, fmt);
+    vfprintf(stderr, fmt, va);
+    fputc('\n', stderr);
+    va_end(va);
+}
+
+#endif
+
 }
 }

src/platform/platform.h

@@ -67,6 +67,9 @@ const void *LoadResource(const std::string &name, size_t *size);
 // Startup and command-line argument handling.
 std::vector<std::string> InitCli(int argc, char **argv);
 
+// Debug print function.
+void DebugPrint(const char *fmt, ...);
+
 }
 
 #endif

src/platform/utilunix.cpp

@@ -8,17 +8,6 @@
 
 namespace SolveSpace {
 
-void dbp(const char *fmt, ...)
-{
-    va_list va;
-    va_start(va, fmt);
-    vfprintf(stdout, fmt, va);
-    fputc('\n', stdout);
-    va_end(va);
-
-    fflush(stdout);
-}
-
 //-----------------------------------------------------------------------------
 // A separate heap, on which we allocate expressions. Maybe a bit faster,
 // since fragmentation is less of a concern, and it also makes it possible

src/platform/utilwin.cpp

@@ -10,26 +10,6 @@
 
 namespace SolveSpace {
 
-void dbp(const char *str, ...)
-{
-    va_list f;
-    static char buf[1024*50];
-    va_start(f, str);
-    _vsnprintf(buf, sizeof(buf), str, f);
-    va_end(f);
-
-    // The native version of OutputDebugString, unlike most others,
-    // is OutputDebugStringA.
-    OutputDebugStringA(buf);
-    OutputDebugStringA("\n");
-
-#ifndef NDEBUG
-    // Duplicate to stderr in debug builds, but not in release; this is slow.
-    fputs(buf, stderr);
-    fputc('\n', stderr);
-#endif
-}
-
 //-----------------------------------------------------------------------------
 // A separate heap, on which we allocate expressions. Maybe a bit faster,
 // since no fragmentation issues whatsoever, and it also makes it possible

src/solvespace.h

@@ -71,6 +71,11 @@ typedef struct _cairo_surface cairo_surface_t;
     } while(0)
 #endif
 
+#define dbp SolveSpace::Platform::DebugPrint
+#define DBPTRI(tri) \
+    dbp("tri: (%.3f %.3f %.3f) (%.3f %.3f %.3f) (%.3f %.3f %.3f)", \
+        CO((tri).a), CO((tri).b), CO((tri).c))
+
 #ifndef isnan
 #   define isnan(x) (((x) != (x)) || (x > 1e11) || (x < -1e11))
 #endif
@@ -141,11 +146,6 @@ const size_t MAX_RECENT = 8;
 
 #define AUTOSAVE_EXT "slvs~"
 
-void dbp(const char *str, ...);
-#define DBPTRI(tri) \
-    dbp("tri: (%.3f %.3f %.3f) (%.3f %.3f %.3f) (%.3f %.3f %.3f)", \
-        CO((tri).a), CO((tri).b), CO((tri).c))
-
 void *AllocTemporary(size_t n);
 void FreeAllTemporary();