[nginx] Skipping spaces in configuration files (ticket #1557).

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/f17e313009b0
branches:  
changeset: 7334:f17e313009b0
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Thu Aug 09 12:15:42 2018 +0300
description:
Skipping spaces in configuration files (ticket #1557).

Previously, a chunk of spaces larger than NGX_CONF_BUFFER (4096 bytes)
resulted in the "too long parameter" error during parsing such a
configuration.  This was because the code only set start and start_line
on non-whitespace characters, and hence adjacent whitespace characters
were preserved when reading additional data from the configuration file.
Fix is to always move start and start_line if the last character was
a space.

diffstat:

 src/core/ngx_conf_file.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (21 lines):

diff --git a/src/core/ngx_conf_file.c b/src/core/ngx_conf_file.c
--- a/src/core/ngx_conf_file.c
+++ b/src/core/ngx_conf_file.c
@@ -656,13 +656,14 @@ ngx_conf_read_token(ngx_conf_t *cf)
         }
 
         if (last_space) {
+
+            start = b->pos - 1;
+            start_line = cf->conf_file->line;
+
             if (ch == ' ' || ch == '\t' || ch == CR || ch == LF) {
                 continue;
             }
 
-            start = b->pos - 1;
-            start_line = cf->conf_file->line;
-
             switch (ch) {
 
             case ';':