[PATCH] Handle CRLF when reading XML on Windows

[PATCH] Handle CRLF when reading XML on Windows

[Tom Tromey]

xml-support.c uses FOPEN_RT, but then reads the entire contents of the
file and verifies that the number of bytes read matches the length.
This can fail on Windows, where the read will translate line
terminators.

This patch fixes the bug by changing xml-support.c to use FOPEN_RB.
This works because expat correctly handles \r\n line terminators.

gdb/ChangeLog
2019-12-11  Tom Tromey  <tromey@adacore.com>

	* xml-support.c (xml_fetch_content_from_file): Use FOPEN_RB.

gdb/testsuite/ChangeLog
2019-12-11  Tom Tromey  <tromey@adacore.com>

	* gdb.xml/tdesc-arch.exp (set_arch): Add "trans_mode" parameter.
	Add crlf test.

Change-Id: I548438f33eed284dde1de8babf755eaa1a40319d
---
 gdb/ChangeLog                        |  4 ++++
 gdb/testsuite/ChangeLog              |  5 +++++
 gdb/testsuite/gdb.xml/tdesc-arch.exp | 14 +++++++++++---
 gdb/xml-support.c                    |  4 ++--
 4 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/gdb/testsuite/gdb.xml/tdesc-arch.exp b/gdb/testsuite/gdb.xml/tdesc-arch.exp
index 617ab0616b2..d98e50e5624 100644
--- a/gdb/testsuite/gdb.xml/tdesc-arch.exp
+++ b/gdb/testsuite/gdb.xml/tdesc-arch.exp
@@ -55,13 +55,16 @@ if { "$arch1" == "" || "$arch2" == "" || "$default_arch" == "" } {
 
 # Run these tests twice, once for $arch1 and once for $arch2, to
 # make sure that the tdesc file overrides the global default.
+# TRANS_MODE indicates how newlines should be represented; it should
+# be one of the values supported by "fconfigure -translation".
 
-proc set_arch { arch which } {
+proc set_arch { arch which trans_mode } {
     global gdb_prompt
     global subdir
 
     set filename [standard_output_file tdesc-arch.xml]
     set fd [open $filename w]
+    fconfigure $fd -translation $trans_mode
     puts $fd \
 	"<target>
 	    <architecture>$arch</architecture>
@@ -92,8 +95,13 @@ proc set_arch { arch which } {
     remote_file host delete $filename
 }
 
-set_arch $arch1 first
-set_arch $arch2 second
+set_arch $arch1 first lf
+set_arch $arch2 second lf
+
+with_test_prefix crlf {
+    set_arch $arch1 first crlf
+    set_arch $arch2 second crlf
+}
 
 # Check an invalid architecture setting.
 set filename [standard_output_file tdesc-arch.xml]
diff --git a/gdb/xml-support.c b/gdb/xml-support.c
index 915be76066d..6f877d43d97 100644
--- a/gdb/xml-support.c
+++ b/gdb/xml-support.c
@@ -979,11 +979,11 @@ xml_fetch_content_from_file (const char *filename, void *baton)
 
       if (fullname == NULL)
 	malloc_failure (0);
-      file = gdb_fopen_cloexec (fullname, FOPEN_RT);
+      file = gdb_fopen_cloexec (fullname, FOPEN_RB);
       xfree (fullname);
     }
   else
-    file = gdb_fopen_cloexec (filename, FOPEN_RT);
+    file = gdb_fopen_cloexec (filename, FOPEN_RB);
 
   if (file == NULL)
     return {};
-- 
2.21.0

Re: [PATCH] Handle CRLF when reading XML on Windows

[Tom Tromey]

>>>>> "Tom" == Tom Tromey <tromey@adacore.com> writes:

Tom> gdb/ChangeLog
Tom> 2019-12-11  Tom Tromey  <tromey@adacore.com>

Tom> 	* xml-support.c (xml_fetch_content_from_file): Use FOPEN_RB.

I'm checking this in.

Tom