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Check return values from fwrite when saving files.

[originally from svn r8278]

--- a/gtk.c

+++ b/gtk.c

@@ -1328,10 +1328,16 @@

     return fe->filesel_name;

 }

+struct savefile_write_ctx {

+    FILE *fp;

+    int error;

+};

+

 static void savefile_write(void *wctx, void *buf, int len)

 {

-    FILE *fp = (FILE *)wctx;

-    fwrite(buf, 1, len, fp);

+    struct savefile_write_ctx *ctx = (struct savefile_write_ctx *)wctx;

+    if (fwrite(buf, 1, len, ctx->fp) < len)

+	ctx->error = 1;

 }

 static int savefile_read(void *wctx, void *buf, int len)

@@ -1373,9 +1379,18 @@

             return;

         }

-        midend_serialise(fe->me, savefile_write, fp);

+	{

+	    struct savefile_write_ctx ctx;

+	    ctx.fp = fp;

+	    ctx.error = 0;

+	    midend_serialise(fe->me, savefile_write, &ctx);

+	    fclose(fp);

+	    if (ctx.error) {

+		error_box(fe->window, "Error writing save file");

+		return;

+	    }

+	}

-        fclose(fp);

     }

 }