style: comment and names changes in map_goto

[Akim Demaille]

commit fb83319d9cdb592673f7c534e2690b2fd065cfaf
Author: Akim Demaille <akim.demai...@gmail.com>
Date:   Sun Feb 10 13:38:17 2019 +0100

    style: comment and names changes in map_goto
    
    * src/lalr.h, src/lalr.c: Use clearer names.

diff --git a/src/lalr.c b/src/lalr.c
index 03e807de..ff0e4d86 100644
--- a/src/lalr.c
+++ b/src/lalr.c
@@ -122,7 +122,7 @@ set_goto_map (void)
 
 
 goto_number
-map_goto (state_number s0, symbol_number sym)
+map_goto (state_number src, symbol_number sym)
 {
   goto_number low = goto_map[sym - ntokens];
   goto_number high = goto_map[sym - ntokens + 1] - 1;
@@ -132,9 +132,9 @@ map_goto (state_number s0, symbol_number sym)
       aver (low <= high);
       goto_number middle = (low + high) / 2;
       state_number s = from_state[middle];
-      if (s == s0)
+      if (s == src)
         return middle;
-      else if (s < s0)
+      else if (s < src)
         low = middle + 1;
       else
         high = middle - 1;
diff --git a/src/lalr.h b/src/lalr.h
index c8ca6277..84a66f7c 100644
--- a/src/lalr.h
+++ b/src/lalr.h
@@ -96,8 +96,8 @@ extern state_number *from_state;
 /** State number it leads to.  */
 extern state_number *to_state;
 
-/** Find the goto number of the goto from S on non-terminal SYM.  */
-goto_number map_goto (state_number s, symbol_number sym);
+/** The number of the goto from state SRC labeled with nterm SYM.  */
+goto_number map_goto (state_number src, symbol_number sym);
 
 /* goto_follows[i] is the set of tokens following goto i.  */
 extern bitsetv goto_follows;