Optimised strlower (much faster, uses a lookup table)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@1344 e03df62e-2008-0410-955e-edbf42e46eb7

diff --git a/src/inspircd.cpp b/src/inspircd.cpp
index e3162830580df72798b9856b54023ba1b7e7cacc..36d593fdba646c9383f9d73e7c31a8508e64fbc7 100644 (file)
--- a/src/inspircd.cpp
+++ b/src/inspircd.cpp
@@ -220,6 +220,8 @@ std::vector<userrec*> all_opers;
 
 static char already_sent[65536];
 
+char lowermap[255];
+
 void AddOper(userrec* user)
 {
        log(DEBUG,"Oper added to optimization list");
@@ -1305,19 +1307,10 @@ void WriteWallOps(userrec *source, bool local_only, char* text, ...)
 
 void strlower(char *n)
 {
-       if (!n)
+       if (n)
        {
-               return;
-       }
-       for (int i = 0; n[i] != 0; i++)
-       {
-               n[i] = tolower(n[i]);
-               if (n[i] == '[')
-                       n[i] = '{';
-               if (n[i] == ']')
-                       n[i] = '}';
-               if (n[i] == '\\')
-                       n[i] = '|';
+               for (char* t = n; *t; t++)
+                       *t = lowermap[*t];
        }
 }
 
@@ -2367,6 +2360,17 @@ int main(int argc, char** argv)
        }
        strlcpy(MyExecutable,argv[0],MAXBUF);
        
+       // initialize the lowercase mapping table
+       for (int cn = 0; cn < 256; cn++)
+               lowermap[cn] = cn;
+       // lowercase the uppercase chars
+       for (int cn = 65; cn < 91; cn++)
+               lowermap[cn] = tolower(cn);
+       // now replace the specific chars for scandanavian comparison
+       lowermap['['] = '{';
+       lowermap[']'] = '}';
+       lowermap['\\'] = '|';
+
        if (InspIRCd(argv,argc) == ERROR)
        {
                log(DEFAULT,"main: daemon function bailed");