diff -r 99574ca1c253 -r 50fb9c9f6671 libidav/davqlexec.c
--- a/libidav/davqlexec.c	Wed Jul 13 17:10:00 2016 +0200
+++ b/libidav/davqlexec.c	Sun Jul 17 10:40:15 2016 +0200
@@ -29,6 +29,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <inttypes.h>
 
 #include <ucx/utils.h>
 #include <ucx/map.h>
@@ -885,6 +886,52 @@
     return bcode;
 }
 
+static int cmd_str_cmp(DavQLStackObj obj1, DavQLStackObj obj2, davqlcmdtype_t cmd) {
+    sstr_t s1 = obj1.type == 1 ?
+        sstrn(obj1.data.string, obj1.length) :
+        ucx_sprintf("%" PRId64, obj1.data.integer);
+    sstr_t s2 = obj1.type == 1 ?
+        sstrn(obj2.data.string, obj2.length) :
+        ucx_sprintf("%" PRId64, obj2.data.integer);
+    
+    int res = 0;
+    switch(cmd) {
+        case DAVQL_CMD_OP_EQ: {
+            res = sstrcmp(s1, s2) == 0;
+            break;
+        }
+        case DAVQL_CMD_OP_NEQ: {
+            res = sstrcmp(s1, s2) != 0;
+            break;
+        }
+        case DAVQL_CMD_OP_LT: {
+            res = sstrcmp(s1, s2) < 0;
+            break;
+        }
+        case DAVQL_CMD_OP_GT: {
+            res = sstrcmp(s1, s2) > 0;
+            break;
+        }
+        case DAVQL_CMD_OP_LE: {
+            res  = sstrcmp(s1, s2) <= 0;
+            break;
+        }
+        case DAVQL_CMD_OP_GE: {
+            res = sstrcmp(s1, s2) >= 0;
+            break;
+        }
+    }
+    
+    if(obj1.type == 0) {
+        free(s1.ptr);
+    }
+    if(obj2.type == 0) {
+        free(s2.ptr);
+    }
+    
+    return res;
+}
+
 int dav_exec_expr(UcxBuffer *bcode, DavResource *res, DavQLStackObj *result) {
     if(!bcode) {
         result->type = 0;
@@ -1175,7 +1222,7 @@
                 if(obj1.type == 0 && obj2.type == 0) {
                     DAVQL_PUSH_INT(obj1.data.integer == obj2.data.integer);
                 } else {
-                    // TODO: string compare
+                    DAVQL_PUSH_INT(cmd_str_cmp(obj1, obj2, cmd.type));
                 }
                 break;
             }
@@ -1186,7 +1233,7 @@
                 if(obj1.type == 0 && obj2.type == 0) {
                     DAVQL_PUSH_INT(obj1.data.integer != obj2.data.integer);
                 } else {
-                    // TODO: string compare
+                    DAVQL_PUSH_INT(cmd_str_cmp(obj1, obj2, cmd.type));
                 }
                 break;
             }
@@ -1197,7 +1244,7 @@
                 if(obj1.type == 0 && obj2.type == 0) {
                     DAVQL_PUSH_INT(obj1.data.integer < obj2.data.integer);
                 } else {
-                    // TODO: string compare
+                    DAVQL_PUSH_INT(cmd_str_cmp(obj1, obj2, cmd.type));
                 }
                 break;
             }
@@ -1208,7 +1255,7 @@
                 if(obj1.type == 0 && obj2.type == 0) {
                     DAVQL_PUSH_INT(obj1.data.integer > obj2.data.integer);
                 } else {
-                    // TODO: string compare
+                    DAVQL_PUSH_INT(cmd_str_cmp(obj1, obj2, cmd.type));
                 }
                 break;
             }
@@ -1219,7 +1266,7 @@
                 if(obj1.type == 0 && obj2.type == 0) {
                     DAVQL_PUSH_INT(obj1.data.integer <= obj2.data.integer);
                 } else {
-                    // TODO: string compare
+                    DAVQL_PUSH_INT(cmd_str_cmp(obj1, obj2, cmd.type));
                 }
                 break;
             }
@@ -1230,7 +1277,7 @@
                 if(obj1.type == 0 && obj2.type == 0) {
                     DAVQL_PUSH_INT(obj1.data.integer >= obj2.data.integer);
                 } else {
-                    // TODO: string compare
+                    DAVQL_PUSH_INT(cmd_str_cmp(obj1, obj2, cmd.type));
                 }
                 break;
             }