Add support for #ifdef Omnet.

gtests/net/packetdrill/lexer.l

@@ -104,7 +104,7 @@ static s64 hextol(const char *s)
 }
 
 enum ifdef_os {
-	Linux_IFDEF = 1, FreeBSD_IFDEF, NetBSD_IFDEF, OpenBSD_IFDEF
+	Linux_IFDEF = 1, FreeBSD_IFDEF, NetBSD_IFDEF, OpenBSD_IFDEF, Omnet_IFDEF
 };
 
 #define MAX_IFDEF_DEPTH 1
@@ -121,6 +121,8 @@ static inline int get_os_name_length(enum ifdef_os os) {
 		return strlen("NetBSD");
 	case OpenBSD_IFDEF:
 		return strlen("OpenBSD");
+	case Omnet_IFDEF:
+		return strlen("Omnet");
 	default:
 		return -1;
 	}
@@ -147,7 +149,7 @@ static inline bool ignore_ifdef(enum ifdef_os os) {
 		return false;
 	}
 #endif
-	
+	/* no need to handle Omnet here */
 	return true;
 }
 
@@ -156,39 +158,39 @@ static inline char* remove_ifdef_start_and_endtag(char *code, int os_name_length
 	unsigned int endif_length = strlen("#endif");
 	unsigned int newline_before_endif = 0;
 	char *code_without_ifdef = NULL;
-	
+
 	code_without_ifdef = code + ifdef_length + os_name_length;
 	newline_before_endif = strlen(code_without_ifdef) - endif_length;
 	code_without_ifdef[newline_before_endif] = (char) 0;
 	return code_without_ifdef;
 }
-	
+
 
 static void handle_ifdef(enum ifdef_os os, const char *s) {
 	char *code = NULL;
 	char *code_without_ifdef = NULL;
 	int os_name_length = get_os_name_length(os);
-	
+
 	if (os_name_length == -1) {
 		fprintf(stderr, "handle_ifdef with unknown os called.\n");
 		exit(1);
 	}
-	
+
 	if (ignore_ifdef(os)) {
 		return;
 	}
-	
+
 	if (ifdef_stack_ptr >= MAX_IFDEF_DEPTH) {
 		fprintf(stderr, "Ifdefs nested too deeply");
 		exit(1);
 	}
-	
+
 	code = strdup(s);
 	
 	code_without_ifdef = remove_ifdef_start_and_endtag(code, os_name_length);
 	ifdef_stack[ifdef_stack_ptr++] = YY_CURRENT_BUFFER;
 	yy_switch_to_buffer(yy_scan_string(code_without_ifdef));
-	
+
 	free(code);
 }
 
@@ -214,9 +216,10 @@ c_comment	\/\*(([^*])|(\*[^\/]))*\*\/
 /* This matches the following platform specific #ifdef-forms:
  *   #ifdef Linux   => Code that only Linux hosts should execute
  *   #ifdef FreeBSD => Code that only FreeBSD hosts should execute
- *   #ifdef OpenBSD => Code that only OpenBSD hosts should execute
  *   #ifdef NetBSD  => Code that only NetBSD hosts should execute
- *   
+ *   #ifdef OpenBSD => Code that only OpenBSD hosts should execute
+ *   #ifdef Omnet   => Code that only an Omnet based simulation should execute
+ *
  *   the pattern for using #ifdef is like this:
  *   #ifdef Linux
  *   (specific code only for linux)
@@ -230,9 +233,10 @@ ifdef_end   #endif
 end_matcher (([^#])|(#[^e])|(#e[^n])|(#en[^d])|(#end[^i])|(#endi[^f]))*
 
 ifdef_freebsd	{ifdef_begin}(?i:FreeBSD){end_matcher}{ifdef_end}
-ifdef_linux		{ifdef_begin}(?i:Linux){end_matcher}{ifdef_end}
-ifdef_openbsd	{ifdef_begin}(?i:OpenBSD){end_matcher}{ifdef_end}
+ifdef_linux	{ifdef_begin}(?i:Linux){end_matcher}{ifdef_end}
 ifdef_netbsd	{ifdef_begin}(?i:NetBSD){end_matcher}{ifdef_end}
+ifdef_openbsd	{ifdef_begin}(?i:OpenBSD){end_matcher}{ifdef_end}
+ifdef_omnet	{ifdef_begin}(?i:Omnet){end_matcher}{ifdef_end}
 
 /* The regexp for code snippets is analogous to that for C comments.
  * Here is a summary of the regexp for code snippets:
@@ -634,8 +638,9 @@ NULL				return NULL_;
 {c_comment}			/* ignore C-style comment */;
 {ifdef_freebsd}			handle_ifdef(FreeBSD_IFDEF, yytext);
 {ifdef_linux}			handle_ifdef(Linux_IFDEF, yytext);
-{ifdef_openbsd}			handle_ifdef(OpenBSD_IFDEF, yytext);
 {ifdef_netbsd}			handle_ifdef(NetBSD_IFDEF, yytext);
+{ifdef_openbsd}			handle_ifdef(OpenBSD_IFDEF, yytext);
+{ifdef_omnet}			handle_ifdef(Omnet_IFDEF, yytext);
 {code}				yylval.string = code(yytext);   return CODE;
 {ipv4_addr}			yylval.string = strdup(yytext); return IPV4_ADDR;
 {ipv6_addr}			yylval.string = strdup(yytext); return IPV6_ADDR;