Win32: Borland C compatibility fixes.

Several false positive warnings silenced, notably W8012 "Comparing
signed and unsigned" (due to u_short values promoted to int), and
W8072 "Suspicious pointer arithmetic" (due to large type values added
to pointers).

With this patch, it's now again possible to compile nginx using bcc32,
with options we normally compile on win32 minus ipv6 and ssl.

4 files changed, 11 insertions, 7 deletions

diff --git a/src/http/modules/ngx_http_memcached_module.c b/src/http/modules/ngx_http_memcached_module.c
index bfff1bfc2..aaa047e8f 100644
--- a/src/http/modules/ngx_http_memcached_module.c
+++ b/src/http/modules/ngx_http_memcached_module.c
@@ -520,7 +520,7 @@ ngx_http_memcached_filter(void *data, ssize_t bytes)
         return NGX_OK;
     }
 
-    last += u->length - NGX_HTTP_MEMCACHED_END;
+    last += (size_t) (u->length - NGX_HTTP_MEMCACHED_END);
 
     if (ngx_strncmp(last, ngx_http_memcached_end, b->last - last) != 0) {
         ngx_log_error(NGX_LOG_ERR, ctx->request->connection->log, 0,
diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index 680b65871..c44dc52c9 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -157,7 +157,11 @@ typedef struct {
 #define ngx_mp4_atom_header(mp4)   (mp4->buffer_pos - 8)
 #define ngx_mp4_atom_data(mp4)     mp4->buffer_pos
 #define ngx_mp4_atom_data_size(t)  (uint64_t) (sizeof(t) - 8)
-#define ngx_mp4_atom_next(mp4, n)  mp4->buffer_pos += n; mp4->offset += n
+
+
+#define ngx_mp4_atom_next(mp4, n)                                             \
+    mp4->buffer_pos += (size_t) n;                                            \
+    mp4->offset += n
 
 
 #define ngx_mp4_set_atom_name(p, n1, n2, n3, n4)                              \
@@ -956,7 +960,7 @@ ngx_http_mp4_read_ftyp_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "mp4 ftyp atom");
 
     if (atom_data_size > 1024
-        || ngx_mp4_atom_data(mp4) + atom_data_size > mp4->buffer_end)
+        || ngx_mp4_atom_data(mp4) + (size_t) atom_data_size > mp4->buffer_end)
     {
         ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
                       "\"%s\" mp4 ftyp atom is too large:%uL",
@@ -1304,7 +1308,7 @@ ngx_http_mp4_read_trak_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
 
     trak->out[NGX_HTTP_MP4_TRAK_ATOM].buf = atom;
 
-    atom_end = mp4->buffer_pos + atom_data_size;
+    atom_end = mp4->buffer_pos + (size_t) atom_data_size;
     atom_file_end = mp4->offset + atom_data_size;
 
     rc = ngx_http_mp4_read_atom(mp4, ngx_http_mp4_trak_atoms, atom_data_size);
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index a22ed0fcb..f5fd83d14 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1712,7 +1712,7 @@ ngx_http_proxy_chunked_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
 
             if (buf->last - buf->pos >= ctx->chunked.size) {
 
-                buf->pos += ctx->chunked.size;
+                buf->pos += (size_t) ctx->chunked.size;
                 b->last = buf->pos;
                 ctx->chunked.size = 0;
 
@@ -1875,7 +1875,7 @@ ngx_http_proxy_non_buffered_chunked_filter(void *data, ssize_t bytes)
             b->tag = u->output.tag;
 
             if (buf->last - buf->pos >= ctx->chunked.size) {
-                buf->pos += ctx->chunked.size;
+                buf->pos += (size_t) ctx->chunked.size;
                 b->last = buf->pos;
                 ctx->chunked.size = 0;
 
diff --git a/src/http/modules/ngx_http_upstream_ip_hash_module.c b/src/http/modules/ngx_http_upstream_ip_hash_module.c
index 29c74fd54..0e5cf416a 100644
--- a/src/http/modules/ngx_http_upstream_ip_hash_module.c
+++ b/src/http/modules/ngx_http_upstream_ip_hash_module.c
@@ -174,7 +174,7 @@ ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data)
 
     for ( ;; ) {
 
-        for (i = 0; i < iphp->addrlen; i++) {
+        for (i = 0; i < (ngx_uint_t) iphp->addrlen; i++) {
             hash = (hash * 113 + iphp->addr[i]) % 6271;
         }