From 73f9bb4d01aef3e71f0c0366afbe8aeba1f7d09a Mon Sep 17 00:00:00 2001
From: Igor Sysoev <igor@sysoev.ru>
Date: Fri, 16 Jan 2009 13:17:12 +0000
Subject: [PATCH] *) fix duplicate geo ranges *) split existent range and
 insert a new one

---
 src/http/modules/ngx_http_geo_module.c | 48 +++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/src/http/modules/ngx_http_geo_module.c b/src/http/modules/ngx_http_geo_module.c
index d570e3009..310317ac6 100644
--- a/src/http/modules/ngx_http_geo_module.c
+++ b/src/http/modules/ngx_http_geo_module.c
@@ -567,7 +567,9 @@ ngx_http_geo_add_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
                 ngx_memcpy(&range[i + 2], &range[i + 1],
                            (a->nelts - 2 - i) * sizeof(ngx_http_geo_range_t));
 
-                range = &range[i + 1];
+                range[i + 1].start = (u_short) s;
+                range[i + 1].end = (u_short) e;
+                range[i + 1].value = ctx->value;
 
                 goto next;
             }
@@ -578,7 +580,43 @@ ngx_http_geo_add_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
                 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                     "duplicate range \"%V\", value: \"%v\", old value: \"%v\"",
                     ctx->net, ctx->value, range[i].value);
-                continue;
+
+                range[i].value = ctx->value;
+
+                goto next;
+            }
+
+            if (s > (ngx_uint_t) range[i].start
+                && e < (ngx_uint_t) range[i].end)
+            {
+                /* split the range and insert the new one */
+
+                range = ngx_array_push(a);
+                if (range == NULL) {
+                    return NGX_CONF_ERROR;
+                }
+
+                range = ngx_array_push(a);
+                if (range == NULL) {
+                    return NGX_CONF_ERROR;
+                }
+
+                range = a->elts;
+
+                ngx_memcpy(&range[i + 3], &range[i + 1],
+                           (a->nelts - 3 - i) * sizeof(ngx_http_geo_range_t));
+
+                range[i + 2].start = (u_short) (e + 1);
+                range[i + 2].end = range[i].end;
+                range[i + 2].value = range[i].value;
+
+                range[i].end = (u_short) (s - 1);
+
+                range[i + 1].start = (u_short) s;
+                range[i + 1].end = (u_short) e;
+                range[i + 1].value = ctx->value;
+
+                goto next;
             }
 
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
@@ -594,11 +632,13 @@ ngx_http_geo_add_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
             return NGX_CONF_ERROR;
         }
 
-    next:
-
         range->start = (u_short) s;
         range->end = (u_short) e;
         range->value = ctx->value;
+
+    next:
+
+        continue;
     }
 
     return NGX_CONF_OK;