#! /bin/sh /usr/share/dpatch/dpatch-run
## ngx_prealloc.dpatch by Kirill A. Korinskiy <catap@catap.ru>
##
## All lines beginning with `## DP:' are a description of the patch.
## DP: Implement ngx_prealloc

@DPATCH@

diff -r f7e9ab8042e2 src/core/ngx_palloc.c
--- a/src/core/ngx_palloc.c	Fri Jul 04 14:54:09 2008 +0400
+++ b/src/core/ngx_palloc.c	Fri Jul 04 15:37:10 2008 +0400
@@ -254,6 +254,31 @@
     return p;
 }
 
+void *
+ngx_prealloc(ngx_pool_t *pool, void *ptr, size_t old_size, size_t new_size)
+{
+  void *new;
+  if ((u_char*) ptr + old_size == pool->d.last &&
+      pool->d.last + new_size <= pool->d.end) {
+
+    /*
+     * the str allocation is last in the pool
+     * and there is space for new len
+     */
+
+    pool->d.last += new_size;
+    return ptr;
+  }
+
+  new = ngx_palloc(pool, new_size);
+  if (new == NULL) {
+    return NULL;
+  }
+
+  ngx_memcpy((u_char*)new, (u_char*)ptr, old_size);
+
+  return new;
+}
 
 ngx_pool_cleanup_t *
 ngx_pool_cleanup_add(ngx_pool_t *p, size_t size)
diff -r f7e9ab8042e2 src/core/ngx_palloc.h
--- a/src/core/ngx_palloc.h	Fri Jul 04 14:54:09 2008 +0400
+++ b/src/core/ngx_palloc.h	Fri Jul 04 15:37:10 2008 +0400
@@ -70,6 +70,7 @@
 
 void *ngx_alloc(size_t size, ngx_log_t *log);
 void *ngx_calloc(size_t size, ngx_log_t *log);
+void *ngx_prealloc(ngx_pool_t *pool, void *ptr, size_t old_size, size_t new_zie);
 
 ngx_pool_t *ngx_create_pool(size_t size, ngx_log_t *log);
 void ngx_destroy_pool(ngx_pool_t *pool);