Fix potential overwriting of errno.

* va_start, printf, fprintf, vfprintf, va_end are all candidates.

src/error.c

@@ -27,6 +27,7 @@ void SysError_(const char *caller, const char *fmt, ...)
 void SysError_(const char *caller, const char *fmt, ...)
 {
   va_list args;
+  int saved_errno = errno;
 
   va_start(args, fmt);
 
@@ -37,8 +38,11 @@ void SysError_(const char *caller, const char *fmt, ...)
 
   va_end(args);
 
-  if ( errno )
-    perror("System error message ");
+  if ( saved_errno )
+    {
+      errno = saved_errno;
+      perror("System error message");
+    }
 
   exit(EXIT_FAILURE);
 }

src/grid.c

@@ -78,8 +78,6 @@ static const resOps gridOps = {
   gridTxCode
 };
 
-static const struct gridVirtTable serialGridVtable;
-
 static int  GRID_Debug = 0;   /* If set to 1, debugging */
 
 grid_t *gridID2Ptr(int gridID)
@@ -163,7 +161,7 @@ void grid_init(grid_t *gridptr)
   gridptr->ystdname  = NULL;
   memset(gridptr->uuid, 0, CDI_UUID_SIZE);
   gridptr->name         = NULL;
-  gridptr->vtable       = &serialGridVtable;
+  gridptr->vtable       = &cdiGridVtable;
   gridptr->extraData    = NULL;
 }
 
@@ -4697,7 +4695,7 @@ int varDefGrid(int vlistID, const grid_t *grid, int mode)
   return (gridID);
 }
 
-static const struct gridVirtTable serialGridVtable
+const struct gridVirtTable cdiGridVtable
   = {
   .destroy = gridDestroyKernel,
   .duplicateData = gridDuplicateData,

src/grid.h

@@ -104,6 +104,7 @@ struct grid_t {
 void grid_init(grid_t *gridptr);
 void grid_free(grid_t *gridptr);
 grid_t *gridID2Ptr(int gridID);
+extern const struct gridVirtTable cdiGridVtable;
 
 unsigned cdiGridCount(void);