From 14d099181cc5006fab24982c450cbca1025796ad Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 6 May 2008 08:13:39 +0000
Subject: [PATCH] Allow for engine version lines with a suffix.

---
 gpgme/ChangeLog |  6 +++++
 gpgme/version.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/gpgme/ChangeLog b/gpgme/ChangeLog
index e5b441b0..23b5c5d2 100644
--- a/gpgme/ChangeLog
+++ b/gpgme/ChangeLog
@@ -1,3 +1,9 @@
+2008-05-06  Werner Koch  <wk@g10code.com>
+
+	* version.c (extract_version_string): New.
+	(_gpgme_get_program_version): Use it to allow for suffixes in the
+	version line.
+
 2008-04-28  Werner Koch  <wk@g10code.com>
 
 	* engine-gpgconf.c (gpgconf_read): Fixed segv.  Avoid memmove for
diff --git a/gpgme/version.c b/gpgme/version.c
index f010249d..457945a6 100644
--- a/gpgme/version.c
+++ b/gpgme/version.c
@@ -1,6 +1,6 @@
 /* version.c - Version check routines.
    Copyright (C) 2000 Werner Koch (dd9jn)
-   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 g10 Code GmbH
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008 g10 Code GmbH
  
    This file is part of GPGME.
  
@@ -187,6 +187,55 @@ gpgme_check_version (const char *req_version)
 
 #define LINELENGTH 80
 
+/* Extract the version string of a program from STRING.  The version
+   number is expected to be in GNU style format:
+   
+     foo 1.2.3
+     foo (bar system) 1.2.3
+     foo 1.2.3 cruft
+     foo (bar system) 1.2.3 cruft.
+
+  Spaces and tabs are skipped and used as delimiters, a term in
+  (nested) parenthesis before the version string is skipped, the
+  version string may consist of any non-space and non-tab characters
+  but needs to bstart with a digit.
+*/
+static const char *
+extract_version_string (const char *string, size_t *r_len)
+{
+  const char *s;
+  int count, len;
+
+  for (s=string; *s; s++)
+    if (*s == ' ' || *s == '\t')
+        break;
+  while (*s == ' ' || *s == '\t')
+    s++;
+  if (*s == '(')
+    {
+      for (count=1, s++; count && *s; s++)
+        if (*s == '(')
+          count++;
+        else if (*s == ')')
+          count--;
+    }
+  /* For robustness we look for a digit.  */
+  while ( *s && !(*s >= '0' && *s <= '9') )
+    s++;
+  if (*s >= '0' && *s <= '9')
+    {
+      for (len=0; s[len]; len++)
+        if (s[len] == ' ' || s[len] == '\t')
+          break;
+    }
+  else
+    len = 0;
+
+  *r_len = len;
+  return s;
+}
+
+
 /* Retrieve the version number from the --version output of the
    program FILE_NAME.  */
 char *
@@ -243,10 +292,18 @@ _gpgme_get_program_version (const char *const file_name)
 
   if (mark)
     {
-      mark = strrchr (line, ' ');
+      size_t len;
+      const char *s;
+
+      s = extract_version_string (line, &len);
+      if (!len)
+        return NULL;
+      mark = malloc (len + 1);
       if (!mark)
 	return NULL;
-      return strdup (mark + 1);
+      memcpy (mark, s, len);
+      mark[len] = 0;
+      return mark;
     }
 
   return NULL;