- /*
- * This match needs to be more intelligent before
- * the message is useful
- */
- if (match_state[ifdef_level].tos >= 0
- && bcmp(&ps, &match_state[ifdef_level], sizeof ps))
- diag(0, "Syntactically inconsistant #ifdef alternatives.");
+ if (strncmp(s_lab, "#if", 3) == 0) {
+ if (blanklines_around_conditional_compilation) {
+ register c;
+ prefix_blankline_requested++;
+ while ((c = getc(input)) == '\n');
+ ungetc(c, input);
+ }
+ if (ifdef_level < sizeof state_stack / sizeof state_stack[0]) {
+ match_state[ifdef_level].tos = -1;
+ state_stack[ifdef_level++] = ps;
+ }
+ else
+ diag(1, "#if stack overflow");
+ }
+ else if (strncmp(s_lab, "#else", 5) == 0)
+ if (ifdef_level <= 0)
+ diag(1, "Unmatched #else");
+ else {
+ match_state[ifdef_level - 1] = ps;
+ ps = state_stack[ifdef_level - 1];
+ }
+ else if (strncmp(s_lab, "#endif", 6) == 0) {
+ if (ifdef_level <= 0)
+ diag(1, "Unmatched #endif");
+ else {
+ ifdef_level--;
+
+#ifdef undef
+ /*
+ * This match needs to be more intelligent before the
+ * message is useful
+ */
+ if (match_state[ifdef_level].tos >= 0
+ && bcmp(&ps, &match_state[ifdef_level], sizeof ps))
+ diag(0, "Syntactically inconsistant #ifdef alternatives.");