From 743922a2ce266492a7ca034973d70c35ad7919e3 Mon Sep 17 00:00:00 2001
From: Maxim Dounin <mdounin@mdounin.ru>
Date: Wed, 21 Nov 2012 00:55:06 +0000
Subject: [PATCH] Request body: $request_body variable generalization.

The $request_body variable was assuming there can't be more than two
buffers.  While this is currently true due to request body reading
implementation details, this is not a good thing to depend on and may
change in the future.
---
 src/http/ngx_http_variables.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index 457476842..298064a81 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -1767,7 +1767,7 @@ ngx_http_variable_request_body(ngx_http_request_t *r,
 {
     u_char       *p;
     size_t        len;
-    ngx_buf_t    *buf, *next;
+    ngx_buf_t    *buf;
     ngx_chain_t  *cl;
 
     if (r->request_body == NULL
@@ -1792,8 +1792,13 @@ ngx_http_variable_request_body(ngx_http_request_t *r,
         return NGX_OK;
     }
 
-    next = cl->next->buf;
-    len = (buf->last - buf->pos) + (next->last - next->pos);
+    len = buf->last - buf->pos;
+    cl = cl->next;
+
+    for ( /* void */ ; cl; cl = cl->next) {
+        buf = cl->buf;
+        len += buf->last - buf->pos;
+    }
 
     p = ngx_pnalloc(r->pool, len);
     if (p == NULL) {
@@ -1801,9 +1806,12 @@ ngx_http_variable_request_body(ngx_http_request_t *r,
     }
 
     v->data = p;
+    cl = r->request_body->bufs;
 
-    p = ngx_cpymem(p, buf->pos, buf->last - buf->pos);
-    ngx_memcpy(p, next->pos, next->last - next->pos);
+    for ( /* void */ ; cl; cl = cl->next) {
+        buf = cl->buf;
+        p = ngx_cpymem(p, buf->pos, buf->last - buf->pos);
+    }
 
     v->len = len;
     v->valid = 1;