general fn call interface

1 files changed, 14 insertions, 2 deletions

diff --git a/badroff.c b/badroff.c
index 3d715fb..522b305 100644
--- a/badroff.c
+++ b/badroff.c
@@ -51,10 +51,22 @@ char* center(char* text){
     return str;
 }
 
+char* cmds[] = {"CT "};
+char* (*call[])(char* txt) = {center};
+
 char* cmd(void){
     char* dat = popstrbuf(inbuf, chrfill('\n'));
-    if (!strncmp(dat, "CT ", 3)){
-        return center(dat+3);
+    size_t low = 0; size_t high = sizeof(cmds)/sizeof(*cmds); //len
+    while (high >= low){
+        int mid = ((unsigned int)low + (unsigned int)high) >> 1;
+        char* mval = cmds[mid];
+
+        int cmp = strncmp(dat, mval, strlen(mval));
+        if (cmp < 0) // dat < mval
+            low = mid + 1;
+        else if (cmp > 0)
+            high = mid - 1;
+        else return call[mid](dat+strlen(mval));
     }
     return NULL;
 }