+static char *printer_add_enum(int param, char *buffer,
+ int offset, int *nprinters_ptr)
+{
+ DWORD needed, nprinters;
+
+ buffer = srealloc(buffer, offset+512);
+
+ /*
+ * Exploratory call to EnumPrinters to determine how much space
+ * we'll need for the output. Discard the return value since it
+ * will almost certainly be a failure due to lack of space.
+ */
+ EnumPrinters(param, NULL, ENUM_LEVEL, buffer+offset, 512,
+ &needed, &nprinters);
+
+ if (needed < 512)
+ needed = 512;
+
+ buffer = srealloc(buffer, offset+needed);
+
+ if (EnumPrinters(param, NULL, ENUM_LEVEL, buffer+offset,
+ needed, &needed, &nprinters) == 0)
+ return NULL;
+
+ *nprinters_ptr += nprinters;
+
+ return buffer;
+}
+