some hacks (and ifdefs) for macOS until NSPR gets fixed. This at least allows us to test out libReg and find bugs.

modules/libreg/src/reg.c

@@ -249,6 +249,7 @@ fail:
 static void nr_AddNode(REGFILE* pReg);
 static void nr_DeleteNode(REGFILE *pReg);
 static REGFILE* vr_findRegFile(char *filename);
+
 /* -------------------------------------------------------------------- */
 
 static void nr_AddNode(REGFILE* pReg)
@@ -712,8 +713,22 @@ static REGERR nr_ReadHdr(REGFILE *reg)
 
 static REGERR nr_WriteHdr(REGFILE *reg)
 {
+#ifdef XP_MAC
+  #define HACK_WRITE_ENTIRE_RESERVE 1
+#endif
+
 	REGERR err;
+#if HACK_WRITE_ENTIRE_RESERVE
+    /* 
+     * pinkerton
+     * Until NSPR can be fixed to seek out past the EOF on MacOS, we need to make
+     * sure that we write all 128 bytes to push out the EOF to the right location
+     */
+    char hdrBuf[HDRRESERVE];
+    memset(hdrBuf, NULL, HDRRESERVE);
+#else
     char hdrBuf[sizeof(REGHDR)];
+#endif
 
 	XP_ASSERT(reg);
 
@@ -728,7 +743,7 @@ static REGERR nr_WriteHdr(REGFILE *reg)
     nr_WriteLong ( reg->hdr.root,     hdrBuf + HDR_ROOT );
 
 	/* err = nr_WriteFile(reg->fh, 0, sizeof(REGHDR), &reg->hdr); */
-	err = nr_WriteFile(reg->fh, 0, sizeof(REGHDR), &hdrBuf);
+	err = nr_WriteFile(reg->fh, 0, sizeof(hdrBuf), &hdrBuf);
 
 	if (err == REGERR_OK)
 		reg->hdrDirty = 0;
@@ -764,6 +779,21 @@ static REGERR nr_CreateRoot(REGFILE *reg)
     root.valuebuf   = 0;
     root.parent     = 0;
 
+#ifdef XP_MAC
+  #define HACK_UNTIL_NSPR_DOES_SEEK_CORRECTLY 1
+#endif
+#if HACK_UNTIL_NSPR_DOES_SEEK_CORRECTLY
+    /* 
+     * pinkerton
+     * The AppendName() and AppendDesc() code that follows assumes that it can just
+     * seek out past the end of the file and write a name and descriptor. However,
+     * mac doesn't allow that. NSPR needs to be "fixed" somehow, but in the meantime,
+     * we can just write out the header first, extending the EOF to 128 bytes where
+     * the name and desc can follow w/out silently failing.
+     */
+	nr_WriteHdr(reg);
+#endif
+
 	err = nr_AppendName(reg, ROOTKEY_STR, &root);
 	if (err != REGERR_OK)
 		return err;