[gnurl] 16/151: strerror: Fix an error looking up some Windows error strings

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ng0 pushed a commit to branch master
in repository gnurl.

commit 07cf042ececdcdc2b731c7a2040a48f21dde85b6
Author: Jay Satiro <address@hidden>
AuthorDate: Sat Nov 9 18:07:59 2019 -0500

    strerror: Fix an error looking up some Windows error strings
    
    - Use FORMAT_MESSAGE_IGNORE_INSERTS to ignore format specifiers in
      Windows error strings.
    
    Since we are not in control of the error code we don't know what
    information may be needed by the error string's format specifiers.
    
    Prior to this change Windows API error strings which contain specifiers
    (think specifiers like similar to printf specifiers) would not be shown.
    The FormatMessage Windows API call which turns a Windows error code into
    a string could fail and set error ERROR_INVALID_PARAMETER if that error
    string contained a format specifier. FormatMessage expects a va_list for
    the specifiers, unless inserts are ignored in which case no substitution
    is attempted.
    
    Ref: https://devblogs.microsoft.com/oldnewthing/20071128-00/?p=24353
---
 lib/strerror.c      | 6 ++++--
 tests/server/util.c | 3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/strerror.c b/lib/strerror.c
index d0650d80c..7aaa9f4a7 100644
--- a/lib/strerror.c
+++ b/lib/strerror.c
@@ -670,7 +670,8 @@ const char *Curl_strerror(int err, char *buf, size_t buflen)
     wchar_t wbuf[256];
     wbuf[0] = L'\0';
 
-    FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err,
+    FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
+                   FORMAT_MESSAGE_IGNORE_INSERTS), NULL, err,
                   LANG_NEUTRAL, wbuf, sizeof(wbuf)/sizeof(wchar_t), NULL);
     wcstombs(buf, wbuf, max);
   }
@@ -680,7 +681,8 @@ const char *Curl_strerror(int err, char *buf, size_t buflen)
     strncpy(buf, strerror(err), max);
   else {
     if(!get_winsock_error(err, buf, max) &&
-       !FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err,
+       !FormatMessageA((FORMAT_MESSAGE_FROM_SYSTEM |
+                        FORMAT_MESSAGE_IGNORE_INSERTS), NULL, err,
                        LANG_NEUTRAL, buf, (DWORD)max, NULL))
       msnprintf(buf, max, "Unknown error %d (%#x)", err, err);
   }
diff --git a/tests/server/util.c b/tests/server/util.c
index cc53d3bf4..263f0cece 100644
--- a/tests/server/util.c
+++ b/tests/server/util.c
@@ -150,7 +150,8 @@ void win32_perror(const char *msg)
   char buf[512];
   DWORD err = SOCKERRNO;
 
-  if(!FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, err,
+  if(!FormatMessageA((FORMAT_MESSAGE_FROM_SYSTEM |
+                      FORMAT_MESSAGE_IGNORE_INSERTS), NULL, err,
                      LANG_NEUTRAL, buf, sizeof(buf), NULL))
     msnprintf(buf, sizeof(buf), "Unknown error %lu (%#lx)", err, err);
   if(msg)

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