[nginx] Extract out version info function.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/5eb4d7541107
branches:  
changeset: 6257:5eb4d7541107
user:      Kurtis Nusbaum <klnusbaum at gmail.com>
date:      Sun Jul 12 08:31:38 2015 -0700
description:
Extract out version info function.

The code for displaying version info and configuration info seemed to be
cluttering up the main function. I was finding it hard to read main. This
extracts out all of the logic for displaying version and configuration info
into its own function, thus making main easier to read.

diffstat:

 src/core/nginx.c |  123 +++++++++++++++++++++++++++++-------------------------
 1 files changed, 65 insertions(+), 58 deletions(-)

diffs (147 lines):

diff --git a/src/core/nginx.c b/src/core/nginx.c
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -10,6 +10,7 @@
 #include <nginx.h>
 
 
+static void ngx_show_version_info();
 static ngx_int_t ngx_add_inherited_sockets(ngx_cycle_t *cycle);
 static ngx_int_t ngx_get_options(int argc, char *const *argv);
 static ngx_int_t ngx_process_options(ngx_cycle_t *cycle);
@@ -194,64 +195,7 @@ main(int argc, char *const *argv)
     }
 
     if (ngx_show_version) {
-        ngx_write_stderr("nginx version: " NGINX_VER_BUILD NGX_LINEFEED);
-
-        if (ngx_show_help) {
-            ngx_write_stderr(
-                "Usage: nginx [-?hvVtTq] [-s signal] [-c filename] "
-                             "[-p prefix] [-g directives]" NGX_LINEFEED
-                             NGX_LINEFEED
-                "Options:" NGX_LINEFEED
-                "  -?,-h         : this help" NGX_LINEFEED
-                "  -v            : show version and exit" NGX_LINEFEED
-                "  -V            : show version and configure options then exit"
-                                   NGX_LINEFEED
-                "  -t            : test configuration and exit" NGX_LINEFEED
-                "  -T            : test configuration, dump it and exit"
-                                   NGX_LINEFEED
-                "  -q            : suppress non-error messages "
-                                   "during configuration testing" NGX_LINEFEED
-                "  -s signal     : send signal to a master process: "
-                                   "stop, quit, reopen, reload" NGX_LINEFEED
-#ifdef NGX_PREFIX
-                "  -p prefix     : set prefix path (default: "
-                                   NGX_PREFIX ")" NGX_LINEFEED
-#else
-                "  -p prefix     : set prefix path (default: NONE)" NGX_LINEFEED
-#endif
-                "  -c filename   : set configuration file (default: "
-                                   NGX_CONF_PATH ")" NGX_LINEFEED
-                "  -g directives : set global directives out of configuration "
-                                   "file" NGX_LINEFEED NGX_LINEFEED
-                );
-        }
-
-        if (ngx_show_configure) {
-
-#ifdef NGX_COMPILER
-            ngx_write_stderr("built by " NGX_COMPILER NGX_LINEFEED);
-#endif
-
-#if (NGX_SSL)
-            if (SSLeay() == SSLEAY_VERSION_NUMBER) {
-                ngx_write_stderr("built with " OPENSSL_VERSION_TEXT
-                                 NGX_LINEFEED);
-            } else {
-                ngx_write_stderr("built with " OPENSSL_VERSION_TEXT
-                                 " (running with ");
-                ngx_write_stderr((char *) (uintptr_t)
-                                 SSLeay_version(SSLEAY_VERSION));
-                ngx_write_stderr(")" NGX_LINEFEED);
-            }
-#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
-            ngx_write_stderr("TLS SNI support enabled" NGX_LINEFEED);
-#else
-            ngx_write_stderr("TLS SNI support disabled" NGX_LINEFEED);
-#endif
-#endif
-
-            ngx_write_stderr("configure arguments:" NGX_CONFIGURE NGX_LINEFEED);
-        }
+        ngx_show_version_info();
 
         if (!ngx_test_config) {
             return 0;
@@ -419,6 +363,69 @@ main(int argc, char *const *argv)
 }
 
 
+static void
+ngx_show_version_info()
+{
+    ngx_write_stderr("nginx version: " NGINX_VER_BUILD NGX_LINEFEED);
+
+    if (ngx_show_help) {
+        ngx_write_stderr(
+            "Usage: nginx [-?hvVtTq] [-s signal] [-c filename] "
+                         "[-p prefix] [-g directives]" NGX_LINEFEED
+                         NGX_LINEFEED
+            "Options:" NGX_LINEFEED
+            "  -?,-h         : this help" NGX_LINEFEED
+            "  -v            : show version and exit" NGX_LINEFEED
+            "  -V            : show version and configure options then exit"
+                               NGX_LINEFEED
+            "  -t            : test configuration and exit" NGX_LINEFEED
+            "  -T            : test configuration, dump it and exit"
+                               NGX_LINEFEED
+            "  -q            : suppress non-error messages "
+                               "during configuration testing" NGX_LINEFEED
+            "  -s signal     : send signal to a master process: "
+                               "stop, quit, reopen, reload" NGX_LINEFEED
+#ifdef NGX_PREFIX
+            "  -p prefix     : set prefix path (default: " NGX_PREFIX ")"
+                               NGX_LINEFEED
+#else
+            "  -p prefix     : set prefix path (default: NONE)" NGX_LINEFEED
+#endif
+            "  -c filename   : set configuration file (default: " NGX_CONF_PATH
+                               ")" NGX_LINEFEED
+            "  -g directives : set global directives out of configuration "
+                               "file" NGX_LINEFEED NGX_LINEFEED
+        );
+    }
+
+    if (ngx_show_configure) {
+
+#ifdef NGX_COMPILER
+        ngx_write_stderr("built by " NGX_COMPILER NGX_LINEFEED);
+#endif
+
+#if (NGX_SSL)
+        if (SSLeay() == SSLEAY_VERSION_NUMBER) {
+            ngx_write_stderr("built with " OPENSSL_VERSION_TEXT NGX_LINEFEED);
+        } else {
+            ngx_write_stderr("built with " OPENSSL_VERSION_TEXT
+                             " (running with ");
+            ngx_write_stderr((char *) (uintptr_t)
+                             SSLeay_version(SSLEAY_VERSION));
+            ngx_write_stderr(")" NGX_LINEFEED);
+        }
+#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
+        ngx_write_stderr("TLS SNI support enabled" NGX_LINEFEED);
+#else
+        ngx_write_stderr("TLS SNI support disabled" NGX_LINEFEED);
+#endif
+#endif
+
+        ngx_write_stderr("configure arguments:" NGX_CONFIGURE NGX_LINEFEED);
+    }
+}
+
+
 static ngx_int_t
 ngx_add_inherited_sockets(ngx_cycle_t *cycle)
 {