Allow deletion of last book move

[xboard.git] / book.c

diff --git a/book.c b/book.c
index 4bc2521..3650b01 100644 (file)
--- a/book.c
+++ b/book.c
@@ -580,6 +580,7 @@ int TextToMoves(char *text, int moveNum, entry_t *entries)
        float dummy;
        int width = BOARD_RGHT - BOARD_LEFT;
 
+       entries[0].key = hashKey; // make sure key is returned even if no moves
        while((i=sscanf(text, "%f%%%d", &dummy, &w))==2 || (i=sscanf(text, "%d", &w))==1) {
            if(i == 2) text = strchr(text, '%') + 1;  // skip percentage
            if(w == 1) text = strstr(text, "1 ") + 2; // skip weight that could be recognized as move number one
@@ -651,11 +652,11 @@ void SaveToBook(char *text)
     int count = TextToMoves(text, currentMove, entries);
     int offset, i, len1=0, len2, readpos=0, writepos=0;
     FILE *f;
-    if(!count) return;
+    if(!count && !currentCount) return;
     f=fopen(appData.polyglotBook, "rb+");
     if(!f){    DisplayError("Polyglot book not valid", 0); return; }
     offset=find_key(f, entries[0].key, &entry);
-    if(entries[0].key != entry.key) {
+    if(entries[0].key != entry.key && currentCount) {
          DisplayError("Hash keys are different", 0);
          fclose(f);
          return;
@@ -680,3 +681,4 @@ void SaveToBook(char *text)
     }
     fclose(f);
 }
+