Optimize strtolower()/strtoupper()

diff --git a/ext/standard/string.c b/ext/standard/string.c
index 3922ff497d67e6e7c694ba93fc98cb7fad250a74..01c7c6dffe189138e4fddaa3be8970975220d68b 100644 (file)
--- a/ext/standard/string.c
+++ b/ext/standard/string.c
@@ -1439,7 +1439,7 @@ PHPAPI zend_string *php_string_toupper(zend_string *s)
        e = c + ZSTR_LEN(s);
 
        while (c < e) {
-               if (!isupper(*c)) {
+               if (islower(*c)) {
                        register unsigned char *r;
                        zend_string *res = zend_string_alloc(ZSTR_LEN(s), 0);
 
@@ -1508,7 +1508,7 @@ PHPAPI zend_string *php_string_tolower(zend_string *s)
        e = c + ZSTR_LEN(s);
 
        while (c < e) {
-               if (!islower(*c)) {
+               if (isupper(*c)) {
                        register unsigned char *r;
                        zend_string *res = zend_string_alloc(ZSTR_LEN(s), 0);