[nginx] Win32: extended ngx_random() range to 0x7fffffff.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/514c518b9d6c
branches:  
changeset: 9198:514c518b9d6c
user:      J Carter <jordanc.carter at outlook.com>
date:      Sat Dec 09 08:38:14 2023 +0000
description:
Win32: extended ngx_random() range to 0x7fffffff.

rand() is used on win32. RAND_MAX is implementation defined. win32's is
0x7fff.

Existing uses of ngx_random() rely upon 0x7fffffff range provided by
POSIX implementations of random().

diffstat:

 src/os/win32/ngx_win32_config.h |  6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diffs (16 lines):

diff -r cc16989c6d61 -r 514c518b9d6c src/os/win32/ngx_win32_config.h
--- a/src/os/win32/ngx_win32_config.h	Sat Dec 16 03:40:01 2023 +0400
+++ b/src/os/win32/ngx_win32_config.h	Sat Dec 09 08:38:14 2023 +0000
@@ -280,7 +280,11 @@ typedef int                 sig_atomic_t
 
 #define NGX_HAVE_GETADDRINFO         1
 
-#define ngx_random               rand
+#define ngx_random()                                                          \
+    ((long) (0x7fffffff & ( ((uint32_t) rand() << 16)                         \
+                          ^ ((uint32_t) rand() << 8)                          \
+                          ^ ((uint32_t) rand()) )))
+
 #define ngx_debug_init()