Import SQLite 3.10.2.

third_party/sqlite/src/ext/fts1/fts1.c

Index: third_party/sqlite/src/ext/fts1/fts1.c
diff --git a/third_party/sqlite/src/ext/fts1/fts1.c b/third_party/sqlite/src/ext/fts1/fts1.c
index 482cf759ba1d176e004dc0c33ab08a6cc8297665..77fa9e23f595cbb62948f3440ca10fd99aa123b6 100644
--- a/third_party/sqlite/src/ext/fts1/fts1.c
+++ b/third_party/sqlite/src/ext/fts1/fts1.c
@@ -205,13 +205,13 @@ static int getVarint32(const char *p, int *pi){
 */
 /* TODO(shess) Is __isascii() a portable version of (c&0x80)==0? */
 static int safe_isspace(char c){
-  return (c&0x80)==0 ? isspace(c) : 0;
+  return (c&0x80)==0 ? isspace((unsigned char)c) : 0;
 }
 static int safe_tolower(char c){
-  return (c&0x80)==0 ? tolower(c) : c;
+  return (c&0x80)==0 ? tolower((unsigned char)c) : c;
 }
 static int safe_isalnum(char c){
-  return (c&0x80)==0 ? isalnum(c) : 0;
+  return (c&0x80)==0 ? isalnum((unsigned char)c) : 0;
 }
 
 typedef enum DocListType {