(svn r6139) -Codechange: strings are StringID. This should be changed in strings.h as well, but you would need to include openttd.h and that opens a whole new can of worms.

strings.c

@@ -168,7 +168,7 @@ static const char *GetStringPtr(StringID string)
 // These 8 bits will only be set when FormatString wants to print
 // the string in a different case. No one else except FormatString
 // should set those bits.
-char *GetStringWithArgs(char *buffr, uint string, const int32 *argv)
+char *GetStringWithArgs(char *buffr, StringID string, const int32 *argv)
 {
 	uint index = GB(string,  0, 11);
 	uint tab   = GB(string, 11,  5);

strings.h

@@ -12,7 +12,7 @@ static inline char* InlineString(char* buf, uint16 string)
 }
 
 char *GetString(char *buffr, uint16 string);
-char *GetStringWithArgs(char *buffr, uint string, const int32 *argv);
+char *GetStringWithArgs(char *buffr, uint16 string, const int32 *argv);
 
 extern char _userstring[128];