Be more clever when allocating memory for log item to be escaped.

This should save about 70-100 bytes in the request pool with the default config.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1461869 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 15 insertions, 1 deletions

diff --git a/server/util.c b/server/util.c
index 46741dd8b1..d332c38990 100644
--- a/server/util.c
+++ b/server/util.c
@@ -1850,12 +1850,26 @@ AP_DECLARE(char *) ap_escape_logitem(apr_pool_t *p, const char *str)
     char *ret;
     unsigned char *d;
     const unsigned char *s;
+    int length = 0;
 
     if (!str) {
         return NULL;
     }
 
-    ret = apr_palloc(p, 4 * strlen(str) + 1); /* Be safe */
+    /* First, compute the space needed for the escaped string.
+     * This could be tweaked a bit for '\b', '\n'... These characters
+     * should not be common, so do not bother. */
+    s = (const unsigned char *)str;
+    for (; *s; ++s) {
+        if (TEST_CHAR(*s, T_ESCAPE_LOGITEM)) {
+            length += 4;        /* for '\\' + c2x() */
+        }
+        else {
+            length++;
+        }
+    }
+    
+    ret = apr_palloc(p, length + 1);
     d = (unsigned char *)ret;
     s = (const unsigned char *)str;
     for (; *s; ++s) {