[nginx] Win32: fixed some warnings reported by Borland C.

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/f18c285c2e59
branches:  
changeset: 6860:f18c285c2e59
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Sat Dec 24 18:01:14 2016 +0300
description:
Win32: fixed some warnings reported by Borland C.

Most notably, warning W8012 (comparing signed and unsigned values) reported
in multiple places where an unsigned value of small type (e.g., u_short) is
promoted to an int and compared to an unsigned value.

Warning W8072 (suspicious pointer arithmetic) disabled, it is reported
when we increment base pointer in ngx_shm_alloc().

diffstat:

 src/core/ngx_resolver.c                       |  10 +++++-----
 src/http/modules/ngx_http_sub_filter_module.c |   4 ++--
 src/http/ngx_http_file_cache.c                |   6 +++---
 src/mail/ngx_mail_smtp_module.c               |   2 +-
 src/os/win32/ngx_win32_config.h               |   3 +++
 5 files changed, 14 insertions(+), 11 deletions(-)

diffs (112 lines):

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -780,7 +780,7 @@ ngx_resolve_name_locked(ngx_resolver_t *
 #endif
 
         if (rn->nsrvs) {
-            for (i = 0; i < rn->nsrvs; i++) {
+            for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) {
                 if (rn->u.srvs[i].name.data) {
                     ngx_resolver_free_locked(r, rn->u.srvs[i].name.data);
                 }
@@ -2959,7 +2959,7 @@ ngx_resolver_resolve_srv_names(ngx_resol
         ngx_del_timer(ctx->event);
     }
 
-    for (i = 0; i < rn->nsrvs; i++) {
+    for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) {
         srvs[i].name.data = ngx_resolver_alloc(r, rn->u.srvs[i].name.len);
         if (srvs[i].name.data == NULL) {
             goto failed;
@@ -4077,7 +4077,7 @@ ngx_resolver_free_node(ngx_resolver_t *r
 #endif
 
     if (rn->nsrvs) {
-        for (i = 0; i < rn->nsrvs; i++) {
+        for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) {
             if (rn->u.srvs[i].name.data) {
                 ngx_resolver_free_locked(r, rn->u.srvs[i].name.data);
             }
@@ -4206,10 +4206,10 @@ ngx_resolver_export(ngx_resolver_t *r, n
                 d = 0;
             }
 
-            if (j == rn->naddrs) {
+            if (j == (ngx_uint_t) rn->naddrs) {
                 j = 0;
             }
-        } while (++i < rn->naddrs);
+        } while (++i < (ngx_uint_t) rn->naddrs);
     }
 
 #if (NGX_HAVE_INET6)
diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -645,7 +645,7 @@ ngx_http_sub_parse(ngx_http_request_t *r
 
         start = offset - (ngx_int_t) tables->min_match_len + 1;
 
-        i = ngx_max(tables->index[c], ctx->index);
+        i = ngx_max((ngx_uint_t) tables->index[c], ctx->index);
         j = tables->index[c + 1];
 
         while (i != j) {
@@ -978,7 +978,7 @@ ngx_http_sub_init_tables(ngx_http_sub_ta
         }
 
         c = match[i].match.data[tables->min_match_len - 1];
-        while (ch <= c) {
+        while (ch <= (ngx_uint_t) c) {
             tables->index[ch++] = (u_char) i;
         }
     }
diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -553,7 +553,7 @@ ngx_http_file_cache_read(ngx_http_reques
         return NGX_DECLINED;
     }
 
-    if (h->crc32 != c->crc32 || h->header_start != c->header_start) {
+    if (h->crc32 != c->crc32 || (size_t) h->header_start != c->header_start) {
         ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
                       "cache file \"%s\" has md5 collision", c->file.name.data);
         return NGX_DECLINED;
@@ -1495,8 +1495,8 @@ ngx_http_file_cache_update_header(ngx_ht
     if (h.version != NGX_HTTP_CACHE_VERSION
         || h.last_modified != c->last_modified
         || h.crc32 != c->crc32
-        || h.header_start != c->header_start
-        || h.body_start != c->body_start)
+        || (size_t) h.header_start != c->header_start
+        || (size_t) h.body_start != c->body_start)
     {
         ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                        "http file cache \"%s\" content changed",
diff --git a/src/mail/ngx_mail_smtp_module.c b/src/mail/ngx_mail_smtp_module.c
--- a/src/mail/ngx_mail_smtp_module.c
+++ b/src/mail/ngx_mail_smtp_module.c
@@ -280,7 +280,7 @@ ngx_mail_smtp_merge_srv_conf(ngx_conf_t 
 
     p = ngx_cpymem(p, conf->capability.data, conf->capability.len);
 
-    p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
+    ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
 
     p = conf->starttls_capability.data
         + (last - conf->capability.data) + 3;
diff --git a/src/os/win32/ngx_win32_config.h b/src/os/win32/ngx_win32_config.h
--- a/src/os/win32/ngx_win32_config.h
+++ b/src/os/win32/ngx_win32_config.h
@@ -119,6 +119,9 @@ typedef long  time_t;
 /* unreferenced formal parameter */
 #pragma warn -8057
 
+/* suspicious pointer arithmetic */
+#pragma warn -8072
+
 #endif